From cf145c8266ce91b011c056a28acdfe541bae3e5f Mon Sep 17 00:00:00 2001
From: Dev <dev@126.com>
Date: Mon, 2 Nov 2026 17:15:39 +0800
Subject: [PATCH] =?UTF-8?q?=E9=A1=B5=E9=9D=A2=E6=98=BE=E7=A4=BA=E4=BC=98?=
 =?UTF-8?q?=E5=8C=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 frontend/App.tsx                      |   6 +-
 frontend/components/AddTaskModal.tsx  |   4 +-
 frontend/components/EditTaskModal.tsx |   4 +-
 frontend/components/Footer.tsx        |   2 +-
 frontend/components/GoalInputForm.tsx |  18 +-
 frontend/components/Header.tsx        |   2 +-
 frontend/components/LandingPage.tsx   |  31 +--
 frontend/components/LoginPage.tsx     |   8 +-
 frontend/components/PlanHistory.tsx   |   8 +-
 frontend/components/PlannerView.tsx   |  37 ++--
 frontend/components/SignUpPage.tsx    |  10 +-
 frontend/components/TaskItem.tsx      | 302 ++++++++++++++------------
 frontend/components/TaskList.tsx      |   2 +-
 frontend/i18n/translations.ts         |   2 +-
 frontend/index.html                   |   2 +-
 15 files changed, 234 insertions(+), 204 deletions(-)

diff --git a/frontend/App.tsx b/frontend/App.tsx
index f28685b..430e765 100644
--- a/frontend/App.tsx
+++ b/frontend/App.tsx
@@ -475,7 +475,7 @@ const App: React.FC = () => {
 
     return (
         <ToastProvider>
-            <div className="flex flex-col min-h-screen bg-slate-50 dark:bg-slate-900 transition-colors duration-200">
+            <div className="flex flex-col min-h-screen bg-gradient-to-b from-slate-100 via-slate-50 to-white dark:from-slate-950 dark:via-slate-900 dark:to-slate-900 transition-colors duration-200">
                 <Header 
                     user={currentUser}
                     onLogout={handleLogout}
@@ -488,8 +488,8 @@ const App: React.FC = () => {
                     darkMode={darkMode}
                     onToggleDarkMode={() => setDarkMode(!darkMode)}
                 />
-                <main className="flex-grow container mx-auto px-3 sm:px-4 py-6 sm:py-8 md:py-12">
-                    <div className="max-w-4xl mx-auto">
+                <main className="flex-grow container mx-auto px-4 sm:px-6 py-8 sm:py-10 md:py-14">
+                    <div className="max-w-5xl mx-auto">
                         {renderContent()}
                     </div>
                 </main>
diff --git a/frontend/components/AddTaskModal.tsx b/frontend/components/AddTaskModal.tsx
index 88cb190..dc0e09c 100644
--- a/frontend/components/AddTaskModal.tsx
+++ b/frontend/components/AddTaskModal.tsx
@@ -93,13 +93,13 @@ const AddTaskModal: React.FC<AddTaskModalProps> = ({ mode, parentTask, siblingTa
 
     return (
         <div
-            className="fixed inset-0 bg-slate-900/50 dark:bg-slate-900/70 flex items-center justify-center z-50 p-4"
+            className="fixed inset-0 bg-slate-900/40 dark:bg-slate-950/70 backdrop-blur-sm flex items-center justify-center z-50 p-4"
             aria-modal="true"
             role="dialog"
             onClick={onCancel}
         >
             <div
-                className="bg-white dark:bg-slate-800 rounded-xl shadow-2xl w-full max-w-lg p-6 md:p-8 relative max-h-[90vh] overflow-y-auto"
+                className="bg-white dark:bg-slate-800 rounded-2xl shadow-2xl w-full max-w-lg p-6 md:p-8 relative max-h-[90vh] overflow-y-auto border border-slate-200/80 dark:border-slate-700"
                 onClick={(e) => e.stopPropagation()}
             >
                 <button
diff --git a/frontend/components/EditTaskModal.tsx b/frontend/components/EditTaskModal.tsx
index e7c999c..224e14a 100644
--- a/frontend/components/EditTaskModal.tsx
+++ b/frontend/components/EditTaskModal.tsx
@@ -76,13 +76,13 @@ const EditTaskModal: React.FC<EditTaskModalProps> = ({ task, allTasks, onSave, o
 
     return (
         <div
-            className="fixed inset-0 bg-slate-900/50 dark:bg-slate-900/70 flex items-center justify-center z-50 p-4"
+            className="fixed inset-0 bg-slate-900/40 dark:bg-slate-950/70 backdrop-blur-sm flex items-center justify-center z-50 p-4"
             aria-modal="true"
             role="dialog"
             onClick={onCancel}
         >
             <div
-                className="bg-white dark:bg-slate-800 rounded-xl shadow-2xl w-full max-w-lg p-6 md:p-8 relative max-h-[90vh] overflow-y-auto"
+                className="bg-white dark:bg-slate-800 rounded-2xl shadow-2xl w-full max-w-lg p-6 md:p-8 relative max-h-[90vh] overflow-y-auto border border-slate-200/80 dark:border-slate-700"
                 onClick={(e) => e.stopPropagation()}
             >
                 <button
diff --git a/frontend/components/Footer.tsx b/frontend/components/Footer.tsx
index bd72482..0ba62de 100644
--- a/frontend/components/Footer.tsx
+++ b/frontend/components/Footer.tsx
@@ -4,7 +4,7 @@ import { useLanguage } from '../i18n/LanguageContext';
 const Footer: React.FC = () => {
     const { t } = useLanguage();
     return (
-        <footer className="bg-slate-100 dark:bg-slate-800 border-t border-slate-200 dark:border-slate-700">
+        <footer className="bg-white/70 dark:bg-slate-900/80 border-t border-slate-200/80 dark:border-slate-700">
             <div className="container mx-auto px-4 py-6 text-center text-slate-500 dark:text-slate-400">
                 <p>{t('rights', { year: new Date().getFullYear() })}</p>
                 <p className="text-sm mt-1">{t('powered')}</p>
diff --git a/frontend/components/GoalInputForm.tsx b/frontend/components/GoalInputForm.tsx
index 2297998..6bc78ad 100644
--- a/frontend/components/GoalInputForm.tsx
+++ b/frontend/components/GoalInputForm.tsx
@@ -24,15 +24,15 @@ const GoalInputForm: React.FC<GoalInputFormProps> = ({ onGeneratePlan }) => {
     };
 
     return (
-        <div className="bg-white dark:bg-slate-800 p-8 rounded-xl shadow-lg border border-slate-200 dark:border-slate-700 text-center">
-            <h2 className="text-2xl font-bold text-slate-800 dark:text-slate-100 mb-2">{t('nextGoalTitle')}</h2>
-            <p className="text-slate-600 dark:text-slate-400 mb-6">{t('nextGoalSub')}</p>
+        <div className="bg-white dark:bg-slate-800 p-6 sm:p-10 rounded-3xl shadow-sm border border-slate-200/80 dark:border-slate-700 text-center">
+            <h2 className="text-2xl sm:text-3xl font-bold text-slate-800 dark:text-slate-100 mb-2">{t('nextGoalTitle')}</h2>
+            <p className="text-slate-600 dark:text-slate-400 mb-7">{t('nextGoalSub')}</p>
             <form onSubmit={handleSubmit}>
                 <textarea
                     value={goal}
                     onChange={(e) => setGoal(e.target.value)}
                     placeholder={t('goalPlaceholder')}
-                    className="w-full p-4 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg mb-2 focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow text-lg placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                    className="w-full p-4 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-2xl mb-3 focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow text-lg placeholder:text-slate-400 dark:placeholder:text-slate-500"
                     rows={3}
                 />
 
@@ -54,7 +54,7 @@ const GoalInputForm: React.FC<GoalInputFormProps> = ({ onGeneratePlan }) => {
                             value={additionalInfo}
                             onChange={(e) => setAdditionalInfo(e.target.value)}
                             placeholder={t('importPlaceholder')}
-                            className="w-full p-4 bg-slate-50 dark:bg-slate-700/50 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-500 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow text-sm placeholder:text-slate-400 dark:placeholder:text-slate-500 font-mono"
+                            className="w-full p-4 bg-slate-50 dark:bg-slate-700/50 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-500 rounded-2xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 transition-shadow text-sm placeholder:text-slate-400 dark:placeholder:text-slate-500 font-mono"
                             rows={8}
                         />
                         {additionalInfo.trim() && (
@@ -68,7 +68,7 @@ const GoalInputForm: React.FC<GoalInputFormProps> = ({ onGeneratePlan }) => {
                 <button
                     type="submit"
                     disabled={!goal.trim()}
-                    className="w-full bg-green-600 text-white font-semibold px-6 py-3 rounded-lg hover:bg-green-700 transition-colors disabled:bg-slate-400 dark:disabled:bg-slate-600 disabled:cursor-not-allowed"
+                    className="w-full bg-emerald-600 text-white font-semibold px-6 py-3.5 rounded-xl hover:bg-emerald-700 transition-colors disabled:bg-slate-300 dark:disabled:bg-slate-600 disabled:cursor-not-allowed shadow-sm shadow-emerald-200 dark:shadow-none"
                 >
                     {t('generatePlan')}
                 </button>
@@ -76,9 +76,9 @@ const GoalInputForm: React.FC<GoalInputFormProps> = ({ onGeneratePlan }) => {
              <div className="mt-6">
                 <p className="text-sm text-slate-500 dark:text-slate-400">{t('orTryExample')}</p>
                 <div className="flex flex-wrap justify-center gap-2 mt-2">
-                    <button onClick={() => handleExampleClick(t('exampleTripGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3 py-1 rounded-full hover:bg-slate-200 dark:hover:bg-slate-600 transition-colors">{t('exampleTrip')}</button>
-                    <button onClick={() => handleExampleClick(t('exampleSkillGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3 py-1 rounded-full hover:bg-slate-200 dark:hover:bg-slate-600 transition-colors">{t('exampleSkill')}</button>
-                    <button onClick={() => handleExampleClick(t('exampleProductGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3 py-1 rounded-full hover:bg-slate-200 dark:hover:bg-slate-600 transition-colors">{t('exampleProduct')}</button>
+                    <button onClick={() => handleExampleClick(t('exampleTripGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3.5 py-1.5 rounded-full hover:bg-emerald-50 hover:text-emerald-700 dark:hover:bg-emerald-900/30 dark:hover:text-emerald-300 transition-colors">{t('exampleTrip')}</button>
+                    <button onClick={() => handleExampleClick(t('exampleSkillGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3.5 py-1.5 rounded-full hover:bg-emerald-50 hover:text-emerald-700 dark:hover:bg-emerald-900/30 dark:hover:text-emerald-300 transition-colors">{t('exampleSkill')}</button>
+                    <button onClick={() => handleExampleClick(t('exampleProductGoal'))} className="text-xs bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-300 px-3.5 py-1.5 rounded-full hover:bg-emerald-50 hover:text-emerald-700 dark:hover:bg-emerald-900/30 dark:hover:text-emerald-300 transition-colors">{t('exampleProduct')}</button>
                 </div>
             </div>
         </div>
diff --git a/frontend/components/Header.tsx b/frontend/components/Header.tsx
index 521aa03..b625631 100644
--- a/frontend/components/Header.tsx
+++ b/frontend/components/Header.tsx
@@ -78,7 +78,7 @@ const Header: React.FC<HeaderProps> = ({ user, onLogout, onLoginClick, onSignUpC
     }, [showMobileMenu]);
 
     return (
-        <header className="bg-white dark:bg-slate-800 shadow-sm border-b border-slate-200 dark:border-slate-700 sticky top-0 z-40">
+        <header className="bg-white/85 dark:bg-slate-900/85 backdrop-blur-md shadow-sm border-b border-slate-200/80 dark:border-slate-700/80 sticky top-0 z-40">
             <div className="container mx-auto px-3 sm:px-4 py-2.5 sm:py-3 flex justify-between items-center">
                 <div
                     className="flex items-center gap-2 cursor-pointer"
diff --git a/frontend/components/LandingPage.tsx b/frontend/components/LandingPage.tsx
index 3f548b3..1308751 100644
--- a/frontend/components/LandingPage.tsx
+++ b/frontend/components/LandingPage.tsx
@@ -10,8 +10,8 @@ const GenerateIcon = () => <svg xmlns="http://www.w3.org/2000/svg" fill="none" v
 const ExecuteIcon = () => <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" strokeWidth={1.5} stroke="currentColor" className="w-6 h-6"><path strokeLinecap="round" strokeLinejoin="round" d="M9 12.75L11.25 15 15 9.75M21 12a9 9 0 11-18 0 9 9 0 0118 0z" /></svg>;
 
 const FeatureCard: React.FC<{ icon: React.ReactElement; title: string; children: React.ReactNode }> = ({ icon, title, children }) => (
-    <div className="bg-white dark:bg-slate-800 p-6 rounded-lg shadow-md border border-slate-200 dark:border-slate-700">
-        <div className="flex items-center justify-center h-12 w-12 rounded-full bg-green-100 dark:bg-green-900/30 text-green-600 dark:text-green-400 mb-4">
+    <div className="bg-white dark:bg-slate-800 p-6 sm:p-7 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700 text-left hover:-translate-y-0.5 hover:shadow-md transition-all duration-200">
+        <div className="flex items-center justify-center h-12 w-12 rounded-2xl bg-emerald-50 dark:bg-emerald-900/30 text-emerald-600 dark:text-emerald-400 mb-4">
             {icon}
         </div>
         <h3 className="text-lg font-semibold text-slate-900 dark:text-slate-100 mb-2">{title}</h3>
@@ -24,26 +24,27 @@ const LandingPage: React.FC<LandingPageProps> = ({ onGetStarted }) => {
     return (
         <div className="text-center">
             {/* Hero Section */}
-            <section className="py-16 md:py-24">
-                <h1 className="text-4xl md:text-6xl font-extrabold text-slate-900 dark:text-slate-100 mb-4 tracking-tight">
+            <section className="py-14 md:py-20">
+                <p className="inline-flex items-center rounded-full bg-emerald-50 dark:bg-emerald-900/30 text-emerald-700 dark:text-emerald-300 text-xs font-semibold px-3 py-1 mb-5">Goal Planner</p>
+                <h1 className="text-4xl md:text-6xl font-extrabold text-slate-900 dark:text-slate-100 mb-5 tracking-tight leading-[1.1]">
                     {t('heroTitle')}
                 </h1>
-                <p className="max-w-2xl mx-auto text-lg md:text-xl text-slate-600 dark:text-slate-400 mb-8">
+                <p className="max-w-2xl mx-auto text-lg md:text-xl text-slate-600 dark:text-slate-400 mb-8 leading-relaxed">
                     {t('heroSubtitle')}
                 </p>
                 <button
                     onClick={onGetStarted}
-                    className="bg-green-600 text-white font-semibold px-8 py-3 rounded-lg hover:bg-green-700 transition-colors shadow-lg transform hover:scale-105"
+                    className="bg-emerald-600 text-white font-semibold px-8 py-3.5 rounded-xl hover:bg-emerald-700 transition-all shadow-lg shadow-emerald-200/70 dark:shadow-none hover:-translate-y-0.5"
                 >
                     {t('createFirstPlan')}
                 </button>
             </section>
 
             {/* Features Section */}
-            <section id="how-it-works" className="py-16 md:py-24 bg-slate-100 dark:bg-slate-800/50 -mx-4 px-4 sm:rounded-2xl">
+            <section id="how-it-works" className="py-14 md:py-20 bg-white/70 dark:bg-slate-800/40 -mx-4 px-4 sm:mx-0 sm:px-8 sm:rounded-3xl border border-slate-200/70 dark:border-slate-700/60">
                 <h2 className="text-3xl font-bold text-slate-900 dark:text-slate-100 mb-2">{t('howItWorks')}</h2>
                 <p className="max-w-xl mx-auto text-slate-600 dark:text-slate-400 mb-12">{t('howItWorksSub')}</p>
-                <div className="grid md:grid-cols-3 gap-8 max-w-5xl mx-auto">
+                <div className="grid md:grid-cols-3 gap-5 max-w-5xl mx-auto text-left">
                     <FeatureCard
                         icon={<GoalIcon />}
                         title={t('step1Title')}
@@ -69,12 +70,12 @@ const LandingPage: React.FC<LandingPageProps> = ({ onGetStarted }) => {
             <section id="testimonials" className="py-16 md:py-24">
                  <h2 className="text-3xl font-bold text-slate-900 dark:text-slate-100 mb-12">{t('testimonialsTitle')}</h2>
                  <div className="max-w-4xl mx-auto grid md:grid-cols-2 gap-8">
-                    <div className="bg-white dark:bg-slate-800 p-6 rounded-lg shadow-md border border-slate-200 dark:border-slate-700 text-left">
+                    <div className="bg-white dark:bg-slate-800 p-6 sm:p-7 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700 text-left">
                         <p className="text-slate-600 dark:text-slate-400 mb-4">{t('testimonial1')}</p>
                         <p className="font-semibold text-slate-900 dark:text-slate-100">Goal Planner</p>
                         <p className="text-sm text-slate-500 dark:text-slate-500">{t('testimonial1Role')}</p>
                     </div>
-                     <div className="bg-white dark:bg-slate-800 p-6 rounded-lg shadow-md border border-slate-200 dark:border-slate-700 text-left">
+                     <div className="bg-white dark:bg-slate-800 p-6 sm:p-7 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700 text-left">
                         <p className="text-slate-600 dark:text-slate-400 mb-4">{t('testimonial2')}</p>
                         <p className="font-semibold text-slate-900 dark:text-slate-100">Balaji</p>
                         <p className="text-sm text-slate-500 dark:text-slate-500">{t('testimonial2Role')}</p>
@@ -83,7 +84,7 @@ const LandingPage: React.FC<LandingPageProps> = ({ onGetStarted }) => {
             </section>
 
              {/* About Section */}
-            <section id="about" className="py-16 md:py-24 bg-slate-100 dark:bg-slate-800/50 -mx-4 px-4 sm:rounded-2xl">
+            <section id="about" className="py-14 md:py-20 bg-white/70 dark:bg-slate-800/40 -mx-4 px-4 sm:mx-0 sm:px-8 sm:rounded-3xl border border-slate-200/70 dark:border-slate-700/60">
                 <div className="max-w-4xl mx-auto text-center">
                     <h2 className="text-3xl font-bold text-slate-900 dark:text-slate-100 mb-4">{t('missionTitle')}</h2>
                     <p className="text-lg text-slate-600 dark:text-slate-400 mb-8">
@@ -94,14 +95,14 @@ const LandingPage: React.FC<LandingPageProps> = ({ onGetStarted }) => {
 
             {/* Final CTA */}
             <section className="py-16 md:py-24">
-                <div className="max-w-4xl mx-auto text-center bg-green-600 dark:bg-green-700 text-white -mx-4 py-16 px-4 sm:rounded-2xl">
-                    <h2 className="text-4xl font-extrabold mb-4">{t('ctaTitle')}</h2>
-                    <p className="text-lg text-green-100 mb-8 max-w-2xl mx-auto">
+                <div className="max-w-4xl mx-auto text-center bg-gradient-to-br from-emerald-600 to-teal-600 dark:from-emerald-700 dark:to-teal-800 text-white py-14 sm:py-16 px-6 sm:px-10 rounded-3xl shadow-lg shadow-emerald-200/50 dark:shadow-none">
+                    <h2 className="text-3xl sm:text-4xl font-extrabold mb-4">{t('ctaTitle')}</h2>
+                    <p className="text-lg text-emerald-50 mb-8 max-w-2xl mx-auto">
                         {t('ctaBody')}
                     </p>
                     <button
                         onClick={onGetStarted}
-                        className="bg-white dark:bg-slate-900 text-green-600 dark:text-green-400 font-bold px-10 py-4 rounded-lg hover:bg-green-50 dark:hover:bg-slate-800 transition-colors shadow-2xl transform hover:scale-105 text-lg"
+                        className="bg-white text-emerald-700 font-bold px-10 py-4 rounded-xl hover:bg-emerald-50 transition-all shadow-xl hover:-translate-y-0.5 text-lg"
                     >
                         {t('ctaButton')}
                     </button>
diff --git a/frontend/components/LoginPage.tsx b/frontend/components/LoginPage.tsx
index ac1f2b2..5278318 100644
--- a/frontend/components/LoginPage.tsx
+++ b/frontend/components/LoginPage.tsx
@@ -25,7 +25,7 @@ const LoginPage: React.FC<LoginPageProps> = ({ onLogin, onNavigateToSignUp }) =>
     };
 
     return (
-        <div className="bg-white dark:bg-slate-800 p-8 rounded-xl shadow-lg border border-slate-200 dark:border-slate-700 w-full max-w-md">
+        <div className="bg-white dark:bg-slate-800 p-8 sm:p-10 rounded-3xl shadow-sm border border-slate-200/80 dark:border-slate-700 w-full max-w-md mx-auto">
             <AppIcon />
             <h2 className="text-2xl font-bold text-slate-800 dark:text-slate-100 mb-2 text-center">{t('welcomeTitle')}</h2>
             <p className="text-slate-600 dark:text-slate-400 mb-6 text-center">{t('loginSubtitle')}</p>
@@ -37,7 +37,7 @@ const LoginPage: React.FC<LoginPageProps> = ({ onLogin, onNavigateToSignUp }) =>
                         id="email"
                         value={email}
                         onChange={(e) => setEmail(e.target.value)}
-                        className="w-full p-3 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                        className="w-full p-3 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
                         placeholder="you@example.com"
                         required
                     />
@@ -49,14 +49,14 @@ const LoginPage: React.FC<LoginPageProps> = ({ onLogin, onNavigateToSignUp }) =>
                         id="password"
                         value={password}
                         onChange={(e) => setPassword(e.target.value)}
-                        className="w-full p-3 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                        className="w-full p-3 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
                         placeholder="••••••••"
                         required
                     />
                 </div>
                 <button
                     type="submit"
-                    className="w-full bg-green-600 text-white font-semibold px-6 py-3 rounded-lg hover:bg-green-700 transition-colors disabled:bg-slate-400 dark:disabled:bg-slate-600 disabled:cursor-not-allowed"
+                    className="w-full bg-emerald-600 text-white font-semibold px-6 py-3 rounded-xl hover:bg-emerald-700 transition-colors disabled:bg-slate-300 dark:disabled:bg-slate-600 disabled:cursor-not-allowed"
                     disabled={!email || !password}
                 >
                     {t('login')}
diff --git a/frontend/components/PlanHistory.tsx b/frontend/components/PlanHistory.tsx
index e787b9a..98e8a6d 100644
--- a/frontend/components/PlanHistory.tsx
+++ b/frontend/components/PlanHistory.tsx
@@ -118,7 +118,7 @@ const PlanHistory: React.FC<PlanHistoryProps> = ({ onViewPlan, onCreateNew }) =>
                 </div>
                 <button
                     onClick={onCreateNew}
-                    className="bg-green-600 text-white font-semibold px-4 sm:px-5 py-2 sm:py-2.5 rounded-lg hover:bg-green-700 transition-colors text-sm flex items-center gap-2"
+                    className="bg-emerald-600 text-white font-semibold px-4 sm:px-5 py-2 sm:py-2.5 rounded-xl hover:bg-emerald-700 transition-colors text-sm flex items-center gap-2"
                 >
                     <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" strokeWidth={2} stroke="currentColor">
                         <path strokeLinecap="round" strokeLinejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
@@ -134,7 +134,7 @@ const PlanHistory: React.FC<PlanHistoryProps> = ({ onViewPlan, onCreateNew }) =>
             )}
 
             {plans.length === 0 && !error ? (
-                <div className="bg-white dark:bg-slate-800 rounded-xl shadow-sm border border-slate-200 dark:border-slate-700 p-12 text-center">
+                <div className="bg-white dark:bg-slate-800 rounded-3xl shadow-sm border border-slate-200/80 dark:border-slate-700 p-12 text-center">
                     <svg xmlns="http://www.w3.org/2000/svg" className="h-16 w-16 text-slate-300 dark:text-slate-600 mx-auto mb-4" fill="none" viewBox="0 0 24 24" strokeWidth={1} stroke="currentColor">
                         <path strokeLinecap="round" strokeLinejoin="round" d="M9 12h3.75M9 15h3.75M9 18h3.75m3 .75H18a2.25 2.25 0 002.25-2.25V6.108c0-1.135-.845-2.098-1.976-2.192a48.424 48.424 0 00-1.123-.08m-5.801 0c-.065.21-.1.433-.1.664 0 .414.336.75.75.75h4.5a.75.75 0 00.75-.75 2.25 2.25 0 00-.1-.664m-5.8 0A2.251 2.251 0 0113.5 2.25H15c1.012 0 1.867.668 2.15 1.586m-5.8 0c-.376.023-.75.05-1.124.08C9.095 4.01 8.25 4.973 8.25 6.108V8.25m0 0H4.875c-.621 0-1.125.504-1.125 1.125v11.25c0 .621.504 1.125 1.125 1.125h9.75c.621 0 1.125-.504 1.125-1.125V9.375c0-.621-.504-1.125-1.125-1.125H8.25zM6.75 12h.008v.008H6.75V12zm0 3h.008v.008H6.75V15zm0 3h.008v.008H6.75V18z" />
                     </svg>
@@ -142,7 +142,7 @@ const PlanHistory: React.FC<PlanHistoryProps> = ({ onViewPlan, onCreateNew }) =>
                     <p className="text-slate-500 dark:text-slate-400 mb-6">{t('emptyPlansSub')}</p>
                     <button
                         onClick={onCreateNew}
-                        className="bg-green-600 text-white font-semibold px-6 py-2.5 rounded-lg hover:bg-green-700 transition-colors"
+                        className="bg-emerald-600 text-white font-semibold px-6 py-2.5 rounded-xl hover:bg-emerald-700 transition-colors"
                     >
                         {t('createFirst')}
                     </button>
@@ -155,7 +155,7 @@ const PlanHistory: React.FC<PlanHistoryProps> = ({ onViewPlan, onCreateNew }) =>
                             <div
                                 key={plan.id}
                                 onClick={() => handleViewPlan(plan.id)}
-                                className="bg-white dark:bg-slate-800 rounded-xl shadow-sm border border-slate-200 dark:border-slate-700 p-4 sm:p-5 hover:shadow-md hover:border-green-300 dark:hover:border-green-600 transition-all cursor-pointer group"
+                                className="bg-white dark:bg-slate-800 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700 p-5 sm:p-6 hover:shadow-md hover:border-emerald-300 dark:hover:border-emerald-600 transition-all cursor-pointer group"
                             >
                                 <div className="flex justify-between items-start">
                                     <div className="flex-1 min-w-0">
diff --git a/frontend/components/PlannerView.tsx b/frontend/components/PlannerView.tsx
index 37562f9..2c54630 100644
--- a/frontend/components/PlannerView.tsx
+++ b/frontend/components/PlannerView.tsx
@@ -329,17 +329,18 @@ const PlannerView: React.FC<PlannerViewProps> = ({ goal, tasks, planId, onToggle
 
     return (
         <div className="space-y-6">
-            <div className="bg-white dark:bg-slate-800 p-4 sm:p-6 rounded-xl shadow-lg border border-slate-200 dark:border-slate-700">
-                <div className="flex flex-col sm:flex-row justify-between items-start gap-3">
+            <div className="relative overflow-hidden bg-white dark:bg-slate-800 p-5 sm:p-7 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700">
+                <div className="pointer-events-none absolute -right-16 -top-16 h-40 w-40 rounded-full bg-emerald-100/70 dark:bg-emerald-900/20 blur-2xl" />
+                <div className="relative flex flex-col sm:flex-row justify-between items-start gap-4">
                     <div className="min-w-0">
-                        <p className="text-sm font-medium text-slate-500 dark:text-slate-400">{t('yourGoal')}</p>
-                        <h2 className="text-xl sm:text-2xl font-bold text-slate-800 dark:text-slate-100 mt-1 break-words">{goal}</h2>
+                        <p className="text-xs font-semibold uppercase tracking-wider text-emerald-600 dark:text-emerald-400">{t('yourGoal')}</p>
+                        <h2 className="text-xl sm:text-2xl font-bold text-slate-800 dark:text-slate-100 mt-1.5 break-words leading-snug">{goal}</h2>
                     </div>
                     <div className="flex items-center gap-2 flex-shrink-0">
                         {onMyPlans && (
                             <button
                                 onClick={onMyPlans}
-                                className="bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-200 font-semibold px-3 sm:px-4 py-2 rounded-lg hover:bg-slate-200 dark:hover:bg-slate-600 transition-colors text-sm flex items-center gap-1.5"
+                                className="bg-slate-100 dark:bg-slate-700 text-slate-700 dark:text-slate-200 font-semibold px-3 sm:px-4 py-2.5 rounded-xl hover:bg-slate-200 dark:hover:bg-slate-600 transition-colors text-sm flex items-center gap-1.5"
                             >
                                 <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" strokeWidth={1.5} stroke="currentColor">
                                     <path strokeLinecap="round" strokeLinejoin="round" d="M3.75 12h16.5m-16.5 3.75h16.5M3.75 19.5h16.5M5.625 4.5h12.75a1.875 1.875 0 010 3.75H5.625a1.875 1.875 0 010-3.75z" />
@@ -349,29 +350,29 @@ const PlannerView: React.FC<PlannerViewProps> = ({ goal, tasks, planId, onToggle
                         )}
                         <button
                             onClick={onStartOver}
-                            className="bg-green-600 text-white font-semibold px-3 sm:px-4 py-2 rounded-lg hover:bg-green-700 transition-colors text-sm"
+                            className="bg-emerald-600 text-white font-semibold px-3 sm:px-4 py-2.5 rounded-xl hover:bg-emerald-700 transition-colors text-sm shadow-sm shadow-emerald-200 dark:shadow-none"
                         >
                             {t('newPlan')}
                         </button>
                     </div>
                 </div>
                 
-                <div className="mt-6">
-                    <div className="flex justify-between items-center mb-1">
+                <div className="relative mt-6">
+                    <div className="flex justify-between items-center mb-2">
                         <span className="text-sm font-medium text-slate-600 dark:text-slate-300">{t('progress')}</span>
-                        <span className="text-sm font-bold text-green-600 dark:text-green-400">{t('tasksCount', { done: completedTasks, total: totalTasks })}</span>
+                        <span className="text-sm font-bold text-emerald-600 dark:text-emerald-400">{t('tasksCount', { done: completedTasks, total: totalTasks })}</span>
                     </div>
-                    <div className="w-full bg-slate-200 dark:bg-slate-600 rounded-full h-2.5">
-                        <div className="bg-green-600 dark:bg-green-500 h-2.5 rounded-full transition-all duration-500" style={{ width: `${progress}%` }}></div>
+                    <div className="w-full bg-slate-100 dark:bg-slate-700 rounded-full h-2.5">
+                        <div className="bg-gradient-to-r from-emerald-500 to-teal-400 h-2.5 rounded-full transition-all duration-500" style={{ width: `${progress}%` }}></div>
                     </div>
-                    <p className="text-xs text-slate-500 dark:text-slate-400 mt-2 text-right">
+                    <p className="text-xs text-slate-500 dark:text-slate-400 mt-2.5 text-right">
                         {t('totalTime', { hours: totalDuration.toFixed(1) })}
                     </p>
                 </div>
             </div>
 
             {/* Search & Filter Bar */}
-            <div className="bg-white dark:bg-slate-800 p-3 sm:p-4 rounded-xl shadow border border-slate-200 dark:border-slate-700">
+            <div className="bg-white dark:bg-slate-800 p-3 sm:p-4 rounded-2xl shadow-sm border border-slate-200/80 dark:border-slate-700">
                 <div className="flex flex-col sm:flex-row gap-2 sm:gap-3">
                     {/* Search */}
                     <div className="relative flex-grow">
@@ -383,14 +384,14 @@ const PlannerView: React.FC<PlannerViewProps> = ({ goal, tasks, planId, onToggle
                             value={searchQuery}
                             onChange={(e) => setSearchQuery(e.target.value)}
                             placeholder={t('searchTasks')}
-                            className="w-full pl-9 pr-3 py-2 text-sm bg-slate-50 dark:bg-slate-700 text-slate-800 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow"
+                            className="w-full pl-9 pr-3 py-2.5 text-sm bg-slate-50 dark:bg-slate-700 text-slate-800 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 transition-shadow"
                         />
                     </div>
                     {/* Status filter */}
                     <select
                         value={filterStatus}
                         onChange={(e) => setFilterStatus(e.target.value as 'all' | TaskStatus)}
-                        className="px-3 py-2 text-sm bg-slate-50 dark:bg-slate-700 text-slate-700 dark:text-slate-200 border border-slate-200 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500"
+                        className="px-3 py-2.5 text-sm bg-slate-50 dark:bg-slate-700 text-slate-700 dark:text-slate-200 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500"
                     >
                         <option value="all">{t('statusAll')}</option>
                         <option value="todo">{t('statusTodo')}</option>
@@ -401,7 +402,7 @@ const PlannerView: React.FC<PlannerViewProps> = ({ goal, tasks, planId, onToggle
                     <select
                         value={filterPriority}
                         onChange={(e) => setFilterPriority(e.target.value as 'all' | 'low' | 'medium' | 'high')}
-                        className="px-3 py-2 text-sm bg-slate-50 dark:bg-slate-700 text-slate-700 dark:text-slate-200 border border-slate-200 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500"
+                        className="px-3 py-2.5 text-sm bg-slate-50 dark:bg-slate-700 text-slate-700 dark:text-slate-200 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500"
                     >
                         <option value="all">{t('priorityAll')}</option>
                         <option value="high">{t('priorityHighFull')}</option>
@@ -412,9 +413,9 @@ const PlannerView: React.FC<PlannerViewProps> = ({ goal, tasks, planId, onToggle
             </div>
 
             <div>
-                <h3 className="text-xl font-bold text-slate-800 dark:text-slate-100 mb-4">{t('actionPlan')}</h3>
+                <h3 className="text-lg sm:text-xl font-bold text-slate-800 dark:text-slate-100 mb-4">{t('actionPlan')}</h3>
                 {filteredTasks.length === 0 ? (
-                    <div className="text-center py-12 text-slate-400 dark:text-slate-500">
+                    <div className="text-center py-16 text-slate-400 dark:text-slate-500 bg-white dark:bg-slate-800 rounded-2xl border border-dashed border-slate-200 dark:border-slate-700">
                         <svg xmlns="http://www.w3.org/2000/svg" className="h-12 w-12 mx-auto mb-3 opacity-50" fill="none" viewBox="0 0 24 24" strokeWidth={1} stroke="currentColor">
                             <path strokeLinecap="round" strokeLinejoin="round" d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z" />
                         </svg>
diff --git a/frontend/components/SignUpPage.tsx b/frontend/components/SignUpPage.tsx
index df503c0..80e3c69 100644
--- a/frontend/components/SignUpPage.tsx
+++ b/frontend/components/SignUpPage.tsx
@@ -26,7 +26,7 @@ const SignUpPage: React.FC<SignUpPageProps> = ({ onSignUp, onNavigateToLogin })
     };
 
     return (
-        <div className="bg-white dark:bg-slate-800 p-8 rounded-xl shadow-lg border border-slate-200 dark:border-slate-700 w-full max-w-md">
+        <div className="bg-white dark:bg-slate-800 p-8 sm:p-10 rounded-3xl shadow-sm border border-slate-200/80 dark:border-slate-700 w-full max-w-md mx-auto">
             <AppIcon />
             <h2 className="text-2xl font-bold text-slate-800 dark:text-slate-100 mb-2 text-center">{t('createAccount')}</h2>
             <p className="text-slate-600 dark:text-slate-400 mb-6 text-center">{t('signupSubtitle')}</p>
@@ -38,7 +38,7 @@ const SignUpPage: React.FC<SignUpPageProps> = ({ onSignUp, onNavigateToLogin })
                         id="name"
                         value={name}
                         onChange={(e) => setName(e.target.value)}
-                        className="w-full p-3 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                        className="w-full p-3 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
                         placeholder={t('namePlaceholder')}
                         required
                     />
@@ -50,7 +50,7 @@ const SignUpPage: React.FC<SignUpPageProps> = ({ onSignUp, onNavigateToLogin })
                         id="signup-email"
                         value={email}
                         onChange={(e) => setEmail(e.target.value)}
-                        className="w-full p-3 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                        className="w-full p-3 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
                         placeholder="you@example.com"
                         required
                     />
@@ -62,14 +62,14 @@ const SignUpPage: React.FC<SignUpPageProps> = ({ onSignUp, onNavigateToLogin })
                         id="signup-password"
                         value={password}
                         onChange={(e) => setPassword(e.target.value)}
-                        className="w-full p-3 bg-white dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-300 dark:border-slate-600 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
+                        className="w-full p-3 bg-slate-50 dark:bg-slate-700 text-slate-900 dark:text-slate-100 border border-slate-200 dark:border-slate-600 rounded-xl focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 focus:bg-white dark:focus:bg-slate-700 transition-shadow placeholder:text-slate-400 dark:placeholder:text-slate-500"
                         placeholder="••••••••"
                         required
                     />
                 </div>
                 <button
                     type="submit"
-                    className="w-full bg-green-600 text-white font-semibold px-6 py-3 rounded-lg hover:bg-green-700 transition-colors disabled:bg-slate-400 dark:disabled:bg-slate-600 disabled:cursor-not-allowed"
+                    className="w-full bg-emerald-600 text-white font-semibold px-6 py-3 rounded-xl hover:bg-emerald-700 transition-colors disabled:bg-slate-300 dark:disabled:bg-slate-600 disabled:cursor-not-allowed"
                     disabled={!name || !email || !password}
                 >
                     {t('createAccount')}
diff --git a/frontend/components/TaskItem.tsx b/frontend/components/TaskItem.tsx
index 3a3dc09..b70e570 100644
--- a/frontend/components/TaskItem.tsx
+++ b/frontend/components/TaskItem.tsx
@@ -31,9 +31,39 @@ const ClockIcon = () => (
 );
 
 const levelConfig = [
-    { accent: 'emerald', badge: 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300', border: 'border-l-emerald-400', hoverBg: 'hover:border-l-emerald-500', barColor: 'bg-emerald-500', barTrack: 'bg-emerald-100 dark:bg-emerald-900/30', iconBg: 'bg-emerald-50 text-emerald-600 dark:bg-emerald-900/30 dark:text-emerald-400', checkBg: 'bg-emerald-600 border-emerald-600' },
-    { accent: 'sky', badge: 'bg-sky-100 text-sky-700 dark:bg-sky-900/30 dark:text-sky-300', border: 'border-l-sky-400', hoverBg: 'hover:border-l-sky-500', barColor: 'bg-sky-500', barTrack: 'bg-sky-100 dark:bg-sky-900/30', iconBg: 'bg-sky-50 text-sky-600 dark:bg-sky-900/30 dark:text-sky-400', checkBg: 'bg-sky-600 border-sky-600' },
-    { accent: 'violet', badge: 'bg-violet-100 text-violet-700 dark:bg-violet-900/30 dark:text-violet-300', border: 'border-l-violet-400', hoverBg: 'hover:border-l-violet-500', barColor: 'bg-violet-500', barTrack: 'bg-violet-100 dark:bg-violet-900/30', iconBg: 'bg-violet-50 text-violet-600 dark:bg-violet-900/30 dark:text-violet-400', checkBg: 'bg-violet-600 border-violet-600' },
+    {
+        accent: 'emerald',
+        badge: 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/40 dark:text-emerald-300',
+        border: 'border-l-emerald-500',
+        barColor: 'bg-emerald-500',
+        barTrack: 'bg-emerald-100 dark:bg-emerald-900/40',
+        iconBg: 'bg-emerald-50 text-emerald-600 dark:bg-emerald-900/40 dark:text-emerald-300',
+        checkBg: 'bg-emerald-600 border-emerald-600',
+        nest: 'bg-emerald-50/80 dark:bg-emerald-950/30 border-emerald-100 dark:border-emerald-900/50',
+        rail: 'bg-emerald-300 dark:bg-emerald-700',
+    },
+    {
+        accent: 'sky',
+        badge: 'bg-sky-100 text-sky-700 dark:bg-sky-900/40 dark:text-sky-300',
+        border: 'border-l-sky-500',
+        barColor: 'bg-sky-500',
+        barTrack: 'bg-sky-100 dark:bg-sky-900/40',
+        iconBg: 'bg-sky-50 text-sky-600 dark:bg-sky-900/40 dark:text-sky-300',
+        checkBg: 'bg-sky-600 border-sky-600',
+        nest: 'bg-sky-50/80 dark:bg-sky-950/25 border-sky-100 dark:border-sky-900/40',
+        rail: 'bg-sky-300 dark:bg-sky-700',
+    },
+    {
+        accent: 'violet',
+        badge: 'bg-violet-100 text-violet-700 dark:bg-violet-900/40 dark:text-violet-300',
+        border: 'border-l-violet-500',
+        barColor: 'bg-violet-500',
+        barTrack: 'bg-violet-100 dark:bg-violet-900/40',
+        iconBg: 'bg-violet-50 text-violet-600 dark:bg-violet-900/40 dark:text-violet-300',
+        checkBg: 'bg-violet-600 border-violet-600',
+        nest: 'bg-violet-50/80 dark:bg-violet-950/25 border-violet-100 dark:border-violet-900/40',
+        rail: 'bg-violet-300 dark:bg-violet-700',
+    },
 ];
 
 const priorityConfig: Record<TaskPriority, { color: string; dot: string }> = {
@@ -124,56 +154,97 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
         }
     }, [task.dueDate, task.status, t]);
 
-    const indentPx = level * 28;
+    const cardPad = level === 0 ? 'px-3.5 py-3.5 sm:px-5 sm:py-5' : 'px-3.5 py-3 sm:px-4 sm:py-3.5';
+    const titleSize = level === 0 ? 'text-base sm:text-[17px]' : level === 1 ? 'text-[15px]' : 'text-sm';
+
+    const actionButtons = (
+        <>
+            <button
+                onClick={(e) => { e.stopPropagation(); onAddSiblingTask(task); }}
+                className="p-1.5 sm:p-2 text-teal-500 hover:text-teal-700 dark:text-teal-400 dark:hover:text-teal-300 rounded-lg hover:bg-teal-50 dark:hover:bg-teal-900/20 transition-all duration-150"
+                title={t('addSibling')}
+            >
+                <svg xmlns="http://www.w3.org/2000/svg" className="w-4 h-4" viewBox="0 0 20 20" fill="currentColor">
+                    <path fillRule="evenodd" d="M10 2a.75.75 0 01.75.75v6.5h2.94l-1.47-1.47a.75.75 0 111.06-1.06l2.75 2.75a.75.75 0 010 1.06l-2.75 2.75a.75.75 0 11-1.06-1.06l1.47-1.47h-2.94v6.5a.75.75 0 01-1.5 0v-6.5H6.31l1.47 1.47a.75.75 0 11-1.06 1.06l-2.75-2.75a.75.75 0 010-1.06l2.75-2.75a.75.75 0 011.06 1.06L6.31 9.25h2.94v-6.5A.75.75 0 0110 2z" clipRule="evenodd" />
+                </svg>
+            </button>
+            {level < 2 && (
+                <button
+                    onClick={(e) => { e.stopPropagation(); onAddChildTask(task); }}
+                    className="p-1.5 sm:p-2 text-blue-500 hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300 rounded-lg hover:bg-blue-50 dark:hover:bg-blue-900/20 transition-all duration-150"
+                    title={t('addChild')}
+                >
+                    <svg xmlns="http://www.w3.org/2000/svg" className="w-4 h-4" viewBox="0 0 20 20" fill="currentColor">
+                        <path fillRule="evenodd" d="M2 4.75A.75.75 0 012.75 4h3a.75.75 0 010 1.5H4.5v7.75a2.25 2.25 0 002.25 2.25h4.19l-1.47-1.47a.75.75 0 111.06-1.06l2.75 2.75a.75.75 0 010 1.06l-2.75 2.75a.75.75 0 11-1.06-1.06l1.47-1.47H6.75A3.75 3.75 0 013 12.25V5.5H2.75A.75.75 0 012 4.75z" clipRule="evenodd" />
+                    </svg>
+                </button>
+            )}
+            <button
+                onClick={(e) => { e.stopPropagation(); onEditTask(task); }}
+                className="p-1.5 sm:p-2 text-emerald-500 hover:text-emerald-700 dark:text-emerald-400 dark:hover:text-emerald-300 rounded-lg hover:bg-emerald-50 dark:hover:bg-emerald-900/20 transition-all duration-150"
+                title={t('editTask')}
+            >
+                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-4 h-4">
+                    <path d="M2.695 14.763l-1.262 3.154a.5.5 0 00.65.65l3.155-1.262a4 4 0 001.343-.885L17.5 5.5a2.121 2.121 0 00-3-3L3.58 13.42a4 4 0 00-.885 1.343z" />
+                </svg>
+            </button>
+            <button
+                onClick={(e) => { e.stopPropagation(); setShowDeleteConfirm(true); }}
+                className="p-1.5 sm:p-2 text-red-400 hover:text-red-600 dark:text-red-400 dark:hover:text-red-300 rounded-lg hover:bg-red-50 dark:hover:bg-red-900/20 transition-all duration-150"
+                title={t('deleteTask')}
+            >
+                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-4 h-4">
+                    <path fillRule="evenodd" d="M8.75 1A2.75 2.75 0 006 3.75v.443c-.795.077-1.584.176-2.365.298a.75.75 0 10.23 1.482l.149-.022 1.005 11.27A2.75 2.75 0 007.77 19h4.46a2.75 2.75 0 002.751-2.529l1.005-11.27.149.022a.75.75 0 10.23-1.482A41.03 41.03 0 0014 4.193V3.75A2.75 2.75 0 0011.25 1h-2.5zM10 4c.84 0 1.673.025 2.5.075V3.75c0-.69-.56-1.25-1.25-1.25h-2.5c-.69 0-1.25.56-1.25 1.25v.325C8.327 4.025 9.16 4 10 4zM8.58 7.72a.75.75 0 00-1.5.06l.3 7.5a.75.75 0 101.5-.06l-.3-7.5zm4.34.06a.75.75 0 10-1.5-.06l-.3 7.5a.75.75 0 101.5.06l.3-7.5z" clipRule="evenodd" />
+                </svg>
+            </button>
+        </>
+    );
 
     return (
         <div
-            className={`group/task ${dragOverTask?.id === task.id ? 'ring-2 ring-blue-400/50 rounded-lg' : ''}`}
+            className={`group/task ${dragOverTask?.id === task.id ? 'ring-2 ring-blue-400/60 rounded-2xl' : ''}`}
             draggable
             onDragStart={(e) => { e.stopPropagation(); onDragStart?.(task); }}
             onDragOver={(e) => { e.stopPropagation(); onDragOver?.(e, task); }}
             onDrop={(e) => { e.stopPropagation(); onDrop?.(e, task); }}
             onDragEnd={() => { onDragEnd?.(); }}
         >
-            {/* Main task row */}
             <div
-                style={{ marginLeft: indentPx }}
                 className={`
-                    relative bg-white dark:bg-slate-800 rounded-lg border border-l-[3px] ${config.border} ${config.hoverBg}
-                    border-slate-200/80 dark:border-slate-600/50
-                    px-3.5 py-3
+                    relative bg-white dark:bg-slate-800 border-l-4 ${config.border}
+                    border border-slate-200/90 dark:border-slate-700
+                    ${level === 0 ? 'rounded-2xl shadow-sm' : 'rounded-xl'}
+                    ${cardPad}
                     transition-all duration-200 ease-out
-                    ${isDone ? 'bg-slate-50/70 dark:bg-slate-800/70' : isInProgress ? 'bg-blue-50/30 dark:bg-blue-900/10' : isLocked ? 'bg-slate-50/50 dark:bg-slate-800/50' : 'hover:shadow-md hover:shadow-slate-100 dark:hover:shadow-slate-900/30'}
-                    ${isDone ? 'border-slate-200/50 dark:border-slate-600/30' : ''}
+                    ${isDone ? 'bg-slate-50/80 dark:bg-slate-800/70' : isInProgress ? 'bg-blue-50/40 dark:bg-blue-950/20' : isLocked ? 'bg-slate-50/70 dark:bg-slate-800/60' : 'hover:shadow-md hover:shadow-slate-200/70 dark:hover:shadow-black/20'}
                 `}
             >
-                <div className="flex items-start gap-2.5">
-                    {/* Collapse / dot indicator */}
+                <div className="flex items-start gap-2 sm:gap-3">
                     {hasChildren ? (
                         <button
                             onClick={() => setCollapsed(!collapsed)}
-                            className={`flex-shrink-0 mt-0.5 w-5 h-5 rounded-md flex items-center justify-center ${config.iconBg} hover:scale-110 active:scale-95 transition-all duration-150`}
+                            className={`flex-shrink-0 w-7 h-7 sm:w-8 sm:h-8 rounded-lg flex items-center justify-center ${config.iconBg} hover:scale-105 active:scale-95 transition-all duration-150`}
                             title={collapsed ? t('expand') : t('collapse')}
+                            aria-expanded={!collapsed}
                         >
                             <svg
                                 xmlns="http://www.w3.org/2000/svg"
-                                className={`h-3 w-3 transition-transform duration-200 ${collapsed ? '' : 'rotate-90'}`}
+                                className={`h-4 w-4 transition-transform duration-200 ${collapsed ? '' : 'rotate-90'}`}
                                 fill="none" viewBox="0 0 24 24" strokeWidth={2.5} stroke="currentColor"
                             >
                                 <path strokeLinecap="round" strokeLinejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
                             </svg>
                         </button>
                     ) : (
-                        <div className="flex-shrink-0 mt-1 w-5 h-5 flex items-center justify-center">
-                            <div className={`w-1.5 h-1.5 rounded-full transition-colors duration-200 ${isDone ? 'bg-emerald-400' : isInProgress ? 'bg-blue-400 animate-pulse' : 'bg-slate-300 dark:bg-slate-500'}`} />
+                        <div className="flex-shrink-0 w-7 h-7 sm:w-8 sm:h-8 flex items-center justify-center">
+                            <div className={`w-2 h-2 rounded-full transition-colors duration-200 ${isDone ? 'bg-emerald-400' : isInProgress ? 'bg-blue-400 animate-pulse' : 'bg-slate-300 dark:bg-slate-500'}`} />
                         </div>
                     )}
 
-                    {/* Checkbox / Status toggle */}
-                    <div className="flex-shrink-0 mt-0.5 relative" ref={statusMenuRef}>
+                    <div className="flex-shrink-0 mt-1 relative" ref={statusMenuRef}>
                         {hasChildren && isLocked && !isDone ? (
-                            <div title={t('depLocked')} className="w-[18px] h-[18px] flex items-center justify-center text-slate-400">
-                                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-[18px] h-[18px]">
+                            <div title={t('depLocked')} className="w-5 h-5 flex items-center justify-center text-slate-400">
+                                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-5 h-5">
                                     <path fillRule="evenodd" d="M10 1a4.5 4.5 0 00-4.5 4.5V9H5a2 2 0 00-2 2v6a2 2 0 002 2h10a2 2 0 002-2v-6a2 2 0 00-2-2h-.5V5.5A4.5 4.5 0 0010 1zm3 8V5.5a3 3 0 10-6 0V9h6z" clipRule="evenodd" />
                                 </svg>
                             </div>
@@ -185,17 +256,17 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                                 tabIndex={0}
                                 onKeyDown={(e) => { if (e.key === ' ' || e.key === 'Enter') handleToggle() }}
                                 title={isDone ? t('autoDone') : t('finishChildrenFirst')}
-                                className={`w-[18px] h-[18px] rounded-[5px] border-2 flex items-center justify-center transition-all duration-200 ${isDone ? `${config.checkBg}` : 'bg-slate-50 dark:bg-slate-700 border-slate-300 dark:border-slate-500'} cursor-pointer active:scale-90`}
+                                className={`w-5 h-5 rounded-md border-2 flex items-center justify-center transition-all duration-200 ${isDone ? `${config.checkBg}` : 'bg-slate-50 dark:bg-slate-700 border-slate-300 dark:border-slate-500'} cursor-pointer active:scale-90`}
                             >
                                 {isDone && (
-                                    <svg className="w-2.5 h-2.5 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={3.5}>
+                                    <svg className="w-3 h-3 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={3.5}>
                                         <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
                                     </svg>
                                 )}
                             </div>
                         ) : effectivelyLocked && !isDone ? (
-                            <div title={t('needDeps')} className="w-[18px] h-[18px] flex items-center justify-center text-slate-400">
-                                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-[18px] h-[18px]">
+                            <div title={t('needDeps')} className="w-5 h-5 flex items-center justify-center text-slate-400">
+                                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-5 h-5">
                                     <path fillRule="evenodd" d="M10 1a4.5 4.5 0 00-4.5 4.5V9H5a2 2 0 00-2 2v6a2 2 0 002 2h10a2 2 0 002-2v-6a2 2 0 00-2-2h-.5V5.5A4.5 4.5 0 0010 1zm3 8V5.5a3 3 0 10-6 0V9h6z" clipRule="evenodd" />
                                 </svg>
                             </div>
@@ -213,13 +284,13 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                                     }
                                 }}
                                 className={`
-                                    w-[18px] h-[18px] rounded-[5px] border-2 flex items-center justify-center
+                                    w-5 h-5 rounded-md border-2 flex items-center justify-center
                                     transition-all duration-200 cursor-pointer active:scale-90
                                     ${isDone ? `${config.checkBg}` : isInProgress ? 'bg-blue-500 border-blue-500' : 'bg-white dark:bg-slate-700 border-slate-300 dark:border-slate-500 hover:border-emerald-400'}
                                 `}
                             >
                                 {isDone && (
-                                    <svg className="w-2.5 h-2.5 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={3.5}>
+                                    <svg className="w-3 h-3 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={3.5}>
                                         <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
                                     </svg>
                                 )}
@@ -231,7 +302,7 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
 
                         {/* Status dropdown menu */}
                         {showStatusMenu && (
-                            <div className="absolute top-6 left-0 z-50 bg-white dark:bg-slate-700 rounded-lg shadow-lg border border-slate-200 dark:border-slate-600 py-1 min-w-[120px]">
+                            <div className="absolute top-7 left-0 z-50 bg-white dark:bg-slate-700 rounded-xl shadow-xl border border-slate-200 dark:border-slate-600 py-1.5 min-w-[140px]">
                                 {[
                                     { value: 'todo', label: t('statusTodo'), icon: '⬜' },
                                     { value: 'in_progress', label: t('statusDoing'), icon: '🔵' },
@@ -240,7 +311,7 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                                     <button
                                         key={s.value}
                                         onClick={() => handleStatusSelect(s.value)}
-                                        className={`w-full text-left px-3 py-1.5 text-sm hover:bg-slate-50 dark:hover:bg-slate-600 flex items-center gap-2 ${task.status === s.value ? 'font-semibold text-green-600 dark:text-green-400' : 'text-slate-700 dark:text-slate-200'}`}
+                                        className={`w-full text-left px-3 py-2 text-sm hover:bg-slate-50 dark:hover:bg-slate-600 flex items-center gap-2 ${task.status === s.value ? 'font-semibold text-green-600 dark:text-green-400' : 'text-slate-700 dark:text-slate-200'}`}
                                     >
                                         <span>{s.icon}</span>
                                         <span>{s.label}</span>
@@ -250,24 +321,21 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                         )}
                     </div>
 
-                    {/* Content */}
-                    <div className="flex-grow min-w-0">
-                        {/* Title row */}
-                        <div className="flex items-center gap-1.5 flex-wrap">
-                            <span className={`text-[10px] font-bold px-1.5 py-0.5 rounded ${config.badge} leading-none`}>
+                    <div className="flex-1 min-w-0 pt-0.5">
+                        <div className="flex items-center gap-1.5 sm:gap-2 flex-wrap">
+                            <span className={`text-[11px] font-bold px-2 py-0.5 rounded-md ${config.badge} leading-none tracking-wide`}>
                                 {taskNumber}
                             </span>
-                            {/* Priority badge */}
                             {task.priority && task.priority !== 'medium' && (
-                                <span className={`text-[9px] font-semibold px-1.5 py-0.5 rounded ${priorityConfig[task.priority].color} leading-none`}>
+                                <span className={`text-[11px] font-semibold px-2 py-0.5 rounded-md ${priorityConfig[task.priority].color} leading-none`}>
                                     {t(task.priority === 'high' ? 'priorityHigh' : task.priority === 'low' ? 'priorityLow' : 'priorityMedium')}
                                 </span>
                             )}
                             <span
                                 onClick={handleToggle}
                                 className={`
-                                    font-medium leading-snug
-                                    ${level === 0 ? 'text-[15px]' : 'text-sm'}
+                                    min-w-0 font-semibold leading-snug
+                                    ${titleSize}
                                     ${isDone ? 'text-slate-400 dark:text-slate-500 line-through decoration-slate-300' : isInProgress ? 'text-blue-700 dark:text-blue-300' : isLocked ? 'text-slate-400 dark:text-slate-500' : 'text-slate-800 dark:text-slate-100'}
                                     ${!isLocked && !hasChildren ? 'cursor-pointer' : ''}
                                     transition-colors duration-150
@@ -275,126 +343,87 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                             >
                                 {task.title}
                             </span>
-                            {/* In progress indicator */}
                             {isInProgress && (
-                                <span className="text-[9px] font-semibold px-1.5 py-0.5 rounded bg-blue-100 text-blue-600 dark:bg-blue-900/30 dark:text-blue-400 leading-none">
+                                <span className="text-[11px] font-semibold px-2 py-0.5 rounded-md bg-blue-100 text-blue-600 dark:bg-blue-900/40 dark:text-blue-300 leading-none">
                                     {t('inProgress')}
                                 </span>
                             )}
                         </div>
+                    </div>
 
-                        {/* Description */}
+                    <div className="hidden sm:flex flex-shrink-0 items-center gap-0.5 opacity-0 group-hover/task:opacity-100 focus-within:opacity-100 transition-opacity duration-150">
+                        {actionButtons}
+                    </div>
+                </div>
+
+                <div className="mt-2">
                         {task.description && (
-                            <p className={`mt-1 text-[13px] leading-relaxed ${isDone ? 'text-slate-400 dark:text-slate-500' : isLocked ? 'text-slate-400 dark:text-slate-500' : 'text-slate-500 dark:text-slate-400'}`}>
+                            <p className={`text-sm leading-relaxed ${isDone ? 'text-slate-400 dark:text-slate-500' : isLocked ? 'text-slate-400 dark:text-slate-500' : 'text-slate-500 dark:text-slate-400'}`}>
                                 {task.description}
                             </p>
                         )}
 
-                        {/* Meta info */}
-                        <div className="mt-1.5 flex flex-wrap items-center gap-x-3 gap-y-1 text-[11px]">
-                            {task.dependencies.length > 0 && (
-                                <div className={isDone ? 'text-slate-400 dark:text-slate-500' : 'text-slate-500 dark:text-slate-400'}>
-                                    <span className="font-medium">{t('dependsOn')}</span> {task.dependencies.join(', ')}
-                                </div>
-                            )}
-                            {task.durationInHours > 0 && (
-                                <div className={`flex items-center gap-1 ${isDone ? 'text-slate-400 dark:text-slate-500' : 'text-slate-500 dark:text-slate-400'}`}>
-                                    <ClockIcon />
-                                    <span>{task.durationInHours}h</span>
-                                </div>
-                            )}
-                            {dueDateDisplay && (
-                                <div className={`flex items-center gap-1 ${dueDateDisplay.overdue ? 'text-red-500 font-semibold' : isDone ? 'text-slate-400 dark:text-slate-500' : 'text-slate-500 dark:text-slate-400'}`}>
-                                    <svg xmlns="http://www.w3.org/2000/svg" className="h-3 w-3" viewBox="0 0 20 20" fill="currentColor">
-                                        <path fillRule="evenodd" d="M5.75 2a.75.75 0 01.75.75V4h7V2.75a.75.75 0 011.5 0V4h.25A2.75 2.75 0 0118 6.75v8.5A2.75 2.75 0 0115.25 18H4.75A2.75 2.75 0 012 15.25v-8.5A2.75 2.75 0 014.75 4H5V2.75A.75.75 0 015.75 2zm-1.5 5.5c-.69 0-1.25.56-1.25 1.25v6.5c0 .69.56 1.25 1.25 1.25h10.5c.69 0 1.25-.56 1.25-1.25v-6.5c0-.69-.56-1.25-1.25-1.25H4.25z" clipRule="evenodd" />
-                                    </svg>
-                                    <span>{dueDateDisplay.text}</span>
-                                </div>
-                            )}
-                        </div>
-
-                        {/* Progress bar for parent tasks */}
-                        {hasChildren && (
-                            <div className="mt-2.5">
-                                <div className="flex justify-between items-center mb-1">
-                                    <span className="text-[11px] text-slate-400 dark:text-slate-500">
-                                        {t('childSummary', { done: completedChildren, total: totalChildren })}
+                        {(task.dependencies.length > 0 || task.durationInHours > 0 || dueDateDisplay) && (
+                            <div className={`${task.description ? 'mt-2.5' : ''} flex flex-wrap items-center gap-2 text-xs`}>
+                                {task.dependencies.length > 0 && (
+                                    <span className={`inline-flex items-center rounded-full px-2.5 py-1 ${isDone ? 'bg-slate-100 text-slate-400 dark:bg-slate-700/50 dark:text-slate-500' : 'bg-slate-100 text-slate-500 dark:bg-slate-700/60 dark:text-slate-300'}`}>
+                                        <span className="font-medium mr-1">{t('dependsOn')}</span> {task.dependencies.join(', ')}
                                     </span>
-                                    <span className={`text-[11px] font-bold ${childProgress === 100 ? 'text-emerald-600 dark:text-emerald-400' : 'text-slate-500 dark:text-slate-400'}`}>
+                                )}
+                                {task.durationInHours > 0 && (
+                                    <span className={`inline-flex items-center gap-1 rounded-full px-2.5 py-1 ${isDone ? 'bg-slate-100 text-slate-400 dark:bg-slate-700/50 dark:text-slate-500' : 'bg-slate-100 text-slate-500 dark:bg-slate-700/60 dark:text-slate-300'}`}>
+                                        <ClockIcon />
+                                        <span>{task.durationInHours}h</span>
+                                    </span>
+                                )}
+                                {dueDateDisplay && (
+                                    <span className={`inline-flex items-center gap-1 rounded-full px-2.5 py-1 ${dueDateDisplay.overdue ? 'bg-red-50 text-red-500 font-semibold dark:bg-red-900/20' : isDone ? 'bg-slate-100 text-slate-400 dark:bg-slate-700/50 dark:text-slate-500' : 'bg-slate-100 text-slate-500 dark:bg-slate-700/60 dark:text-slate-300'}`}>
+                                        <svg xmlns="http://www.w3.org/2000/svg" className="h-3.5 w-3.5" viewBox="0 0 20 20" fill="currentColor">
+                                            <path fillRule="evenodd" d="M5.75 2a.75.75 0 01.75.75V4h7V2.75a.75.75 0 011.5 0V4h.25A2.75 2.75 0 0118 6.75v8.5A2.75 2.75 0 0115.25 18H4.75A2.75 2.75 0 012 15.25v-8.5A2.75 2.75 0 014.75 4H5V2.75A.75.75 0 015.75 2zm-1.5 5.5c-.69 0-1.25.56-1.25 1.25v6.5c0 .69.56 1.25 1.25 1.25h10.5c.69 0 1.25-.56 1.25-1.25v-6.5c0-.69-.56-1.25-1.25-1.25H4.25z" clipRule="evenodd" />
+                                        </svg>
+                                        <span>{dueDateDisplay.text}</span>
+                                    </span>
+                                )}
+                            </div>
+                        )}
+
+                        {hasChildren && (
+                            <div className="mt-3.5">
+                                <div className="flex justify-between items-center gap-3 mb-1.5">
+                                    <button
+                                        type="button"
+                                        onClick={() => setCollapsed(!collapsed)}
+                                        className="min-w-0 text-left text-xs leading-snug text-slate-500 dark:text-slate-400 hover:text-slate-700 dark:hover:text-slate-200 transition-colors"
+                                    >
+                                        {t('childSummary', { done: completedChildren, total: totalChildren })}
+                                    </button>
+                                    <span className={`shrink-0 text-xs font-bold tabular-nums ${childProgress === 100 ? 'text-emerald-600 dark:text-emerald-400' : 'text-slate-500 dark:text-slate-400'}`}>
                                         {childProgress}%
                                     </span>
                                 </div>
-                                <div className={`w-full ${config.barTrack} rounded-full h-1`}>
+                                <div className={`w-full ${config.barTrack} rounded-full h-1.5`}>
                                     <div
-                                        className={`h-1 rounded-full transition-all duration-500 ease-out ${childProgress === 100 ? 'bg-emerald-500' : config.barColor}`}
+                                        className={`h-1.5 rounded-full transition-all duration-500 ease-out ${childProgress === 100 ? 'bg-emerald-500' : config.barColor}`}
                                         style={{ width: `${childProgress}%` }}
                                     />
                                 </div>
                             </div>
                         )}
-                    </div>
+                </div>
 
-                    {/* Action buttons - always visible, compact icon row */}
-                    <div className="flex-shrink-0 self-center flex items-center gap-0.5 opacity-0 group-hover/task:opacity-100 transition-opacity duration-150">
-                        {/* Add sibling */}
-                        <button
-                            onClick={(e) => { e.stopPropagation(); onAddSiblingTask(task); }}
-                            className="p-1.5 text-teal-500 hover:text-teal-700 dark:text-teal-400 dark:hover:text-teal-300 rounded-md hover:bg-teal-50 dark:hover:bg-teal-900/20 transition-all duration-150"
-                            title={t('addSibling')}
-                        >
-                            <svg xmlns="http://www.w3.org/2000/svg" className="w-3.5 h-3.5" viewBox="0 0 20 20" fill="currentColor">
-                                <path fillRule="evenodd" d="M10 2a.75.75 0 01.75.75v6.5h2.94l-1.47-1.47a.75.75 0 111.06-1.06l2.75 2.75a.75.75 0 010 1.06l-2.75 2.75a.75.75 0 11-1.06-1.06l1.47-1.47h-2.94v6.5a.75.75 0 01-1.5 0v-6.5H6.31l1.47 1.47a.75.75 0 11-1.06 1.06l-2.75-2.75a.75.75 0 010-1.06l2.75-2.75a.75.75 0 011.06 1.06L6.31 9.25h2.94v-6.5A.75.75 0 0110 2z" clipRule="evenodd" />
-                            </svg>
-                        </button>
-                        {/* Add subtask */}
-                        {level < 2 && (
-                            <button
-                                onClick={(e) => { e.stopPropagation(); onAddChildTask(task); }}
-                                className="p-1.5 text-blue-500 hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300 rounded-md hover:bg-blue-50 dark:hover:bg-blue-900/20 transition-all duration-150"
-                                title={t('addChild')}
-                            >
-                                <svg xmlns="http://www.w3.org/2000/svg" className="w-3.5 h-3.5" viewBox="0 0 20 20" fill="currentColor">
-                                    <path fillRule="evenodd" d="M2 4.75A.75.75 0 012.75 4h3a.75.75 0 010 1.5H4.5v7.75a2.25 2.25 0 002.25 2.25h4.19l-1.47-1.47a.75.75 0 111.06-1.06l2.75 2.75a.75.75 0 010 1.06l-2.75 2.75a.75.75 0 11-1.06-1.06l1.47-1.47H6.75A3.75 3.75 0 013 12.25V5.5H2.75A.75.75 0 012 4.75z" clipRule="evenodd" />
-                                </svg>
-                            </button>
-                        )}
-                        {/* Edit */}
-                        <button
-                            onClick={(e) => { e.stopPropagation(); onEditTask(task); }}
-                            className="p-1.5 text-emerald-500 hover:text-emerald-700 dark:text-emerald-400 dark:hover:text-emerald-300 rounded-md hover:bg-emerald-50 dark:hover:bg-emerald-900/20 transition-all duration-150"
-                            title={t('editTask')}
-                        >
-                            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-3.5 h-3.5">
-                                <path d="M2.695 14.763l-1.262 3.154a.5.5 0 00.65.65l3.155-1.262a4 4 0 001.343-.885L17.5 5.5a2.121 2.121 0 00-3-3L3.58 13.42a4 4 0 00-.885 1.343z" />
-                            </svg>
-                        </button>
-                        {/* Delete */}
-                        <button
-                            onClick={(e) => { e.stopPropagation(); setShowDeleteConfirm(true); }}
-                            className="p-1.5 text-red-400 hover:text-red-600 dark:text-red-400 dark:hover:text-red-300 rounded-md hover:bg-red-50 dark:hover:bg-red-900/20 transition-all duration-150"
-                            title={t('deleteTask')}
-                        >
-                            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" className="w-3.5 h-3.5">
-                                <path fillRule="evenodd" d="M8.75 1A2.75 2.75 0 006 3.75v.443c-.795.077-1.584.176-2.365.298a.75.75 0 10.23 1.482l.149-.022 1.005 11.27A2.75 2.75 0 007.77 19h4.46a2.75 2.75 0 002.751-2.529l1.005-11.27.149.022a.75.75 0 10.23-1.482A41.03 41.03 0 0014 4.193V3.75A2.75 2.75 0 0011.25 1h-2.5zM10 4c.84 0 1.673.025 2.5.075V3.75c0-.69-.56-1.25-1.25-1.25h-2.5c-.69 0-1.25.56-1.25 1.25v.325C8.327 4.025 9.16 4 10 4zM8.58 7.72a.75.75 0 00-1.5.06l.3 7.5a.75.75 0 101.5-.06l-.3-7.5zm4.34.06a.75.75 0 10-1.5-.06l-.3 7.5a.75.75 0 101.5.06l.3-7.5z" clipRule="evenodd" />
-                            </svg>
-                        </button>
-                    </div>
+                <div className="mt-1.5 flex sm:hidden items-center justify-end gap-0.5 -mr-1">
+                    {actionButtons}
                 </div>
             </div>
 
-            {/* Children with tree lines */}
             {hasChildren && !collapsed && (
-                <div className="relative" style={{ marginLeft: indentPx }}>
-                    <div className="absolute top-0 bottom-0 w-px bg-slate-200 dark:bg-slate-600" style={{ left: 14 }} />
-                    <div className="pt-1 space-y-0.5">
-                        {task.children.map((child, index) => {
-                            const isLast = index === task.children!.length - 1;
-                            return (
-                                <div key={child.id} className="relative">
-                                    <div className="absolute top-5 h-px bg-slate-200 dark:bg-slate-600" style={{ left: 14, width: 14 }} />
-                                    {!isLast && <div className="absolute top-0 bottom-0 w-px bg-slate-200 dark:bg-slate-600" style={{ left: 14 }} />}
-                                    {isLast && <div className="absolute top-0 h-5 w-px bg-slate-200 dark:bg-slate-600" style={{ left: 14 }} />}
-                                    <TaskItem
+                <div className={`mt-2.5 sm:ml-8 rounded-2xl border p-2 sm:p-4 space-y-2.5 sm:space-y-3 ${config.nest}`}>
+                    {task.children.map((child, index) => {
+                        const isLast = index === task.children!.length - 1;
+                        return (
+                            <div key={child.id} className="relative sm:pl-4">
+                                <span className={`hidden sm:block absolute left-0 top-5 bottom-5 w-0.5 rounded-full ${config.rail}`} aria-hidden="true" />
+                                <TaskItem
                                         task={child}
                                         taskNumber={`${taskNumber}.${index + 1}`}
                                         onToggleTask={onToggleTask}
@@ -414,10 +443,9 @@ const TaskItem: React.FC<TaskItemProps> = ({ task, taskNumber, onToggleTask, onE
                                         onChildTaskCompleted={onChildTaskCompleted}
                                         onParentTaskCompleted={onParentTaskCompleted}
                                     />
-                                </div>
-                            );
-                        })}
-                    </div>
+                            </div>
+                        );
+                    })}
                 </div>
             )}
 
diff --git a/frontend/components/TaskList.tsx b/frontend/components/TaskList.tsx
index c196006..b02ae65 100644
--- a/frontend/components/TaskList.tsx
+++ b/frontend/components/TaskList.tsx
@@ -48,7 +48,7 @@ const TaskList: React.FC<TaskListProps> = ({ tasks, onToggleTask, onEditTask, on
     };
 
     return (
-        <div className="space-y-2">
+        <div className="space-y-4 sm:space-y-5">
             {tasks.map((task, index) => (
                 <TaskItem
                     key={task.id}
diff --git a/frontend/i18n/translations.ts b/frontend/i18n/translations.ts
index 11f9062..4258bbb 100644
--- a/frontend/i18n/translations.ts
+++ b/frontend/i18n/translations.ts
@@ -46,7 +46,7 @@ const zh = {
     namePlaceholder: '你的名字',
     hasAccount: '已经有账号？',
 
-    nextGoalTitle: '下一个大目标是什么？',
+    nextGoalTitle: '下一个伟大目标是什么？',
     nextGoalSub: '描述你想完成的事，我们来拆步骤。',
     goalPlaceholder: '例如：做一个分享烹饪的个人博客',
     collapseExtra: '收起',
diff --git a/frontend/index.html b/frontend/index.html
index 9f70fb8..8a9ee63 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -34,7 +34,7 @@
 }
 </script>
 </head>
-<body class="bg-slate-50 text-slate-800">
+<body class="bg-slate-50 text-slate-800 antialiased">
     <div id="root"></div>
     <script type="module" src="/index.tsx"></script>
 </body>