/* CSS Variables */
:root {
    --primary: #667eea;
    --primary-dark: #5a6fd8;
    --secondary: #764ba2;
    --accent: #f093fb;
    --danger: #f5576c;
    --success: #4ecdc4;
    --warning: #f9c74f;
    --info: #6a89cc;
    --light: #f8f9fa;
    --dark: #2d3748;
    --gray: #718096;
    --pomodoro: #e74c3c;
    --break: #2ecc71;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
    --gradient-warning: linear-gradient(135deg, #f9c74f 0%, #f8961e 100%);
    --gradient-dark: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);
}

[data-theme="dark"] {
    --light: #2d3748;
    --dark: #f8f9fa;
    --gray: #cbd5e0;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #667eea, #764ba2, #f093fb, #f5576c);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    z-index: -1;
    opacity: 0.1;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 20px 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideDown 0.8s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

.logo-text h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2px;
}

.logo-text p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* App Container */
.app-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Cards */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(102, 126, 234, 0.1);
}

.card-header i {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-header h2 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--dark);
}

.badge {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Form Styles */
.task-form {
    animation: fadeIn 0.8s ease-out;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
}

label i {
    color: var(--primary);
    width: 16px;
}

input, select, textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn.success {
    background: var(--gradient-success);
}

.btn.danger {
    background: var(--gradient-secondary);
}

.btn.secondary {
    background: var(--gradient-warning);
}

.btn.full-width {
    width: 100%;
    justify-content: center;
}

.add-task-btn {
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
}

.ai-generate-btn {
    background: var(--gradient-secondary);
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
}

/* Task List */
.tasks-container {
    max-height: 400px;
    overflow-y: auto;
}

.task-list {
    list-style: none;
    animation: fadeIn 0.8s ease-out;
}

.task-item {
    background: white;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 15px;
    border-left: 5px solid var(--primary);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.task-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.task-item.high-priority {
    border-left-color: var(--danger);
    background: linear-gradient(135deg, #fff 0%, #ffeaea 100%);
}

.task-item.medium-priority {
    border-left-color: var(--warning);
    background: linear-gradient(135deg, #fff 0%, #fff4e6 100%);
}

.task-item.low-priority {
    border-left-color: var(--success);
    background: linear-gradient(135deg, #fff 0%, #f0fff4 100%);
}

.task-item.completed {
    opacity: 0.7;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.task-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
}

.task-meta {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--gray);
}

.task-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.priority-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.priority-high {
    background: #ffeaea;
    color: var(--danger);
}

.priority-medium {
    background: #fff4e6;
    color: var(--warning);
}

.priority-low {
    background: #f0fff4;
    color: var(--success);
}

.task-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.task-actions .btn {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* Timer Styles */
.timer-card {
    text-align: center;
}

.timer-container {
    background: var(--gradient-primary);
    color: white;
    padding: 40px 30px;
    border-radius: 20px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    animation: pulse 2s infinite;
}

.timer-container.break {
    background: var(--gradient-success);
}

.timer-type {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.timer-display {
    font-size: 4.5rem;
    font-weight: 700;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    text-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 25px 0;
}

.timer-btn {
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Progress Bar */
.progress-container {
    margin: 25px 0;
}

.progress-bar {
    height: 12px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress {
    height: 100%;
    background: white;
    border-radius: 10px;
    transition: width 1s ease-in-out;
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.3);
}

/* Session Info */
.session-info {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    font-size: 0.9rem;
}

.session-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 15px;
    border-radius: 20px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 25px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    color: white;
    font-size: 1.2rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 500;
}

/* AI Section */
.ai-loading {
    text-align: center;
    padding: 40px 20px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.plan-summary {
    background: white;
    padding: 25px;
    border-radius: 15px;
    margin-top: 20px;
    box-shadow: var(--shadow-sm);
    animation: slideUp 0.6s ease-out;
}

.ai-plan-content {
    line-height: 1.8;
}

.ai-plan-content h3 {
    color: var(--primary);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.ai-plan-content ol, .ai-plan-content ul {
    margin: 15px 0;
    padding-left: 20px;
}

.ai-plan-content li {
    margin-bottom: 10px;
    padding: 10px;
    background: var(--light);
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.plan-tips {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    padding: 20px;
    border-radius: 12px;
    margin-top: 20px;
    border-left: 4px solid var(--warning);
}

/* Theme Toggle */
.icon-btn {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    transform: rotate(15deg) scale(1.1);
    box-shadow: var(--shadow-glow);
}

.icon-btn.glow {
    animation: glow 2s infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 10px var(--primary); }
    to { box-shadow: 0 0 20px var(--primary), 0 0 30px var(--primary); }
}

/* Confetti */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background: var(--primary);
    animation: confettiFall 5s linear forwards;
    z-index: 1000;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.full-width {
    width: 100%;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .app-container {
        gap: 20px;
    }
    
    .card {
        padding: 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .timer-display {
        font-size: 3rem;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .session-info {
        flex-direction: column;
        gap: 10px;
    }
}

/* Dark Theme Support */
[data-theme="dark"] .card {
    background: rgba(45, 55, 72, 0.95);
    color: var(--light);
}

[data-theme="dark"] .card-header h2 {
    color: var(--light);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: #4a5568;
    border-color: #718096;
    color: var(--light);
}

[data-theme="dark"] .task-item {
    background: #4a5568;
    color: var(--light);
}

[data-theme="dark"] .stat-card {
    background: #4a5568;
    color: var(--light);
}

/* AI Plan Styles */
.ai-plan-content {
    line-height: 1.7;
}

.plan-header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 25px;
    text-align: center;
}

.plan-header h3 {
    margin: 0 0 10px 0;
    font-size: 1.5rem;
}

.plan-meta {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    opacity: 0.9;
}

.priority-section {
    margin-bottom: 30px;
}

.task-priority-list {
    list-style: none;
    padding: 0;
}

.priority-task {
    background: white;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 12px;
    border-left: 5px solid #667eea;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.priority-task:hover {
    transform: translateX(5px);
}

.priority-task.priority-high {
    border-left-color: #f5576c;
    background: linear-gradient(135deg, #fff, #ffeaea);
}

.priority-task.priority-medium {
    border-left-color: #f9c74f;
    background: linear-gradient(135deg, #fff, #fff4e6);
}

.priority-task.priority-low {
    border-left-color: #4ecdc4;
    background: linear-gradient(135deg, #fff, #f0fff4);
}

.task-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.urgency-badge {
    background: #ff6b6b;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: bold;
}

.task-details {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.task-details span {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
}

.strategy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.strategy-item {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    border: 2px solid transparent;
}

.strategy-item:hover {
    border-color: #667eea;
}

.strategy-item i {
    font-size: 2rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.motivational-tips ul {
    list-style: none;
    padding: 0;
}

.motivational-tips li {
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
}

.motivational-tips li:last-child {
    border-bottom: none;
}

.plan-footer {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    padding: 20px;
    border-radius: 12px;
    margin-top: 25px;
    border-left: 4px solid #f9c74f;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
    border-left: 4px solid #667eea;
}

.notification-success { border-left-color: #4ecdc4; }
.notification-error { border-left-color: #f5576c; }
.notification-info { border-left-color: #667eea; }

.notification-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}