/* HabitTrack - Modern CSS Styles */
/* ================================ */

/* CSS Variables */
:root {
    /* Colors - Light Theme */
    --color-primary: #ec4899;
    --color-primary-light: #f9a8d4;
    --color-primary-dark: #db2777;
    
    --color-success: #10b981;
    --color-success-light: #6ee7b7;
    --color-warning: #f59e0b;
    --color-warning-light: #fcd34d;
    --color-danger: #ef4444;
    --color-danger-light: #fca5a5;
    
    --color-bg: #fdf2f8;
    --color-bg-secondary: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-hover: #fce7f3;
    
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    
    --color-border: #f3e8ff;
    --color-border-light: #fce7f3;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Layout */
    --header-height: 60px;
    --nav-height: 70px;
    --sidebar-width: 240px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-card: #1e293b;
    --color-bg-hover: #334155;
    
    --color-text: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    --color-border: #334155;
    --color-border-light: #475569;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: var(--font-size-md);
}

img {
    max-width: 100%;
    height: auto;
}

/* Utility Classes */
.hidden { display: none !important; }
.text-muted { color: var(--color-text-muted); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }

/* Icon Base */
.icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* =================== */
/* Auth Screen Styles  */
/* =================== */
.auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-primary-light) 100%);
}

.auth-container {
    width: 100%;
    max-width: 400px;
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-logo {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.auth-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
}

.auth-tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.auth-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-full);
    padding: 4px;
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.auth-tab.active {
    background: var(--color-primary);
    color: white;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.demo-hint {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.demo-hint code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
}

/* ================ */
/* Form Styles      */
/* ================ */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-group input::placeholder {
    color: var(--color-text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-fast);
    min-height: 44px;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-hover);
}

.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-block {
    width: 100%;
}

.btn-loader {
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.icon-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text);
}

/* =================== */
/* Main App Layout     */
/* =================== */
.main-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-logo {
    font-size: 1.5rem;
}

.header-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-avatar-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-sm);
    min-width: 200px;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.dropdown-header {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.dropdown-header span:first-child {
    font-weight: 600;
}

.dropdown-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 0;
}

.dropdown-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-align: left;
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--color-bg-hover);
}

.dropdown-item .icon {
    width: 18px;
    height: 18px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-md);
    padding-bottom: calc(var(--nav-height) + var(--spacing-md));
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

.page-header {
    margin-bottom: var(--spacing-lg);
}

.page-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

/* ================ */
/* Today Page       */
/* ================ */

/* Week Selector */
.week-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.week-nav-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.week-nav-btn:hover {
    background: var(--color-bg-hover);
}

.week-days {
    display: flex;
    flex: 1;
    justify-content: space-around;
}

.week-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-fast);
    min-width: 44px;
}

.week-day:hover {
    background: var(--color-bg-hover);
}

.week-day.selected {
    background: var(--color-primary);
    color: white;
}

.week-day.today:not(.selected) {
    border: 2px solid var(--color-primary);
}

.week-day-name {
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    color: inherit;
    opacity: 0.7;
}

.week-day-num {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.week-day-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-top: 2px;
}

.week-day-indicator.completed { background: var(--color-success); }
.week-day-indicator.partial { background: var(--color-warning); }
.week-day-indicator.missed { background: var(--color-danger); }

/* Category Filter */
.category-filter {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-md);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-filter::-webkit-scrollbar {
    display: none;
}

.category-chip {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    background: var(--color-bg-card);
    color: var(--color-text-secondary);
    border: 2px solid var(--color-border);
    transition: var(--transition-fast);
}

.category-chip:hover {
    border-color: var(--color-primary);
}

.category-chip.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Progress Section */
.progress-section {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.progress-label {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.progress-value {
    font-weight: 600;
    color: var(--color-primary);
}

.progress-bar {
    height: 8px;
    background: var(--color-bg);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-success) 100%);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.search-box .search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

.search-box input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 44px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-bg-card);
    color: var(--color-text);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Habit List */
.habit-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.habit-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
    transition: var(--transition-fast);
    cursor: pointer;
}

.habit-item:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.habit-item.completed {
    border-color: var(--color-success);
}

.habit-item.missed {
    border-color: var(--color-danger);
}

.habit-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.habit-info {
    flex: 1;
    min-width: 0;
}

.habit-name {
    font-weight: 600;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.habit-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.habit-badge {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.habit-badge.type-habit { background: #dbeafe; color: #1d4ed8; }
.habit-badge.type-task { background: #fce7f3; color: #be185d; }
.habit-badge.type-periodic { background: #d1fae5; color: #047857; }

.habit-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.habit-streak {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: var(--font-size-xs);
    color: var(--color-warning);
}

.habit-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.habit-toggle {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-border);
    transition: var(--transition-fast);
    background: var(--color-bg-secondary);
}

.habit-toggle:hover {
    border-color: var(--color-primary);
}

.habit-toggle.completed {
    background: var(--color-success);
    border-color: var(--color-success);
    color: white;
}

.habit-toggle.missed {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
}

.habit-toggle .icon {
    width: 24px;
    height: 24px;
}

.habit-menu-btn {
    color: var(--color-text-muted);
    padding: var(--spacing-xs);
}

/* =================== */
/* Habits Page         */
/* =================== */
.habit-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.habit-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    transition: var(--transition-fast);
}

.habit-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.habit-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.habit-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--color-border);
}

.habit-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.habit-card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.habit-card-info {
    flex: 1;
}

.habit-card-name {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.habit-card-badges {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: 4px;
}

.habit-card-duration {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

/* Heatmap */
.heatmap-container {
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    -webkit-overflow-scrolling: touch;
}

.heatmap {
    display: flex;
    gap: 3px;
    min-width: max-content;
}

.heatmap-week {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.heatmap-day {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: var(--color-bg);
    cursor: pointer;
    transition: var(--transition-fast);
}

.heatmap-day:hover {
    transform: scale(1.2);
}

.heatmap-day.completed { background: var(--color-success); }
.heatmap-day.partial { background: var(--color-warning); }
.heatmap-day.missed { background: var(--color-danger); }
.heatmap-day.future { background: var(--color-bg); opacity: 0.5; }

.heatmap-tooltip {
    position: fixed;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-text);
    color: var(--color-bg-card);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
}

/* =================== */
/* Statistics Page     */
/* =================== */
.period-filter {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    background: var(--color-bg-card);
    padding: 4px;
    border-radius: var(--radius-full);
}

.period-btn {
    flex: 1;
    padding: var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.period-btn.active {
    background: var(--color-primary);
    color: white;
}

.year-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.year-nav {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.year-nav:hover {
    background: var(--color-bg-hover);
}

#current-year {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* Stats Summary */
.stats-summary {
    margin-bottom: var(--spacing-xl);
}

.stats-summary h3 {
    margin-bottom: var(--spacing-md);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-card {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
}

.stat-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.stat-success .stat-label { color: var(--color-success); }
.stat-success .stat-value { color: var(--color-success); }
.stat-completed .stat-label { color: var(--color-primary); }
.stat-completed .stat-value { color: var(--color-text); }
.stat-skipped .stat-label { color: var(--color-warning); }
.stat-skipped .stat-value { color: var(--color-warning); }
.stat-failed .stat-label { color: var(--color-danger); }
.stat-failed .stat-value { color: var(--color-danger); }

/* Progress Bars */
.habit-progress-section {
    margin-bottom: var(--spacing-xl);
}

.habit-progress-section h3 {
    margin-bottom: var(--spacing-xs);
}

.habit-progress-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.progress-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.progress-row-name {
    width: 100px;
    font-size: var(--font-size-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.progress-row-bar {
    flex: 1;
    height: 24px;
    background: var(--color-bg);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-row-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-row-value {
    width: 45px;
    text-align: right;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

/* Distribution Chart */
.distribution-section h3 {
    margin-bottom: var(--spacing-md);
}

.chart-container {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-md);
    position: relative;
}

#distribution-chart {
    width: 100%;
    height: 100%;
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

/* =================== */
/* Bottom Navigation   */
/* =================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--spacing-sm);
    color: var(--color-text-muted);
    transition: var(--transition-fast);
    border-radius: var(--radius-lg);
    min-width: 60px;
}

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.nav-item:hover {
    color: var(--color-text-secondary);
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-item .icon {
    width: 24px;
    height: 24px;
}

.nav-item.add-btn {
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    margin-top: -20px;
    box-shadow: var(--shadow-lg);
}

.nav-item.add-btn:hover {
    background: var(--color-primary-dark);
    color: white;
}

.nav-item.add-btn .icon {
    width: 28px;
    height: 28px;
}

/* ================ */
/* Modal Styles     */
/* ================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: flex-end;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.2s ease;
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--color-bg-card);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.modal-sm .modal-content {
    max-width: 360px;
    border-radius: var(--radius-xl);
    margin: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: var(--font-size-lg);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
}

.modal-close:hover {
    background: var(--color-bg-hover);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.modal-footer .btn {
    flex: 1;
}

/* Duration Presets */
.duration-presets {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.duration-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    background: var(--color-bg);
    color: var(--color-text-secondary);
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.duration-btn.active {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}

.duration-presets input {
    width: 60px;
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: center;
}

/* Type Chips */
.type-chips {
    display: flex;
    gap: var(--spacing-sm);
}

.type-chip {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.type-chip.active {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}

/* Icon Grid */
.icon-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: var(--spacing-xs);
    max-height: 150px;
    overflow-y: auto;
    padding: var(--spacing-sm);
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.icon-option {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.icon-option:hover {
    background: var(--color-bg-hover);
}

.icon-option.selected {
    background: var(--color-primary);
    color: white;
}

/* Color Swatches */
.color-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 3px solid transparent;
}

.color-swatch:hover {
    transform: scale(1.1);
}

.color-swatch.selected {
    border-color: var(--color-text);
    box-shadow: var(--shadow-md);
}

/* Habit Preview */
.habit-preview {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
}

.habit-preview > label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.preview-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
}

.preview-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.preview-name {
    flex: 1;
    font-weight: 600;
}

.preview-heatmap {
    display: flex;
    gap: 2px;
}

.preview-heatmap-day {
    width: 8px;
    height: 8px;
    border-radius: 2px;
}

/* Toggle Switch */
.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.toggle-label input {
    display: none;
}

.toggle-switch {
    width: 44px;
    height: 24px;
    background: var(--color-bg);
    border-radius: var(--radius-full);
    position: relative;
    transition: var(--transition-fast);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    top: 2px;
    left: 2px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.toggle-label input:checked + .toggle-switch {
    background: var(--color-primary);
}

.toggle-label input:checked + .toggle-switch::after {
    left: 22px;
}

/* Reminder Settings */
.reminder-settings {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
}

.reminder-days {
    margin-bottom: var(--spacing-md);
}

.reminder-days label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.day-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.day-btn {
    flex: 1;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 500;
    background: var(--color-bg-card);
    color: var(--color-text-secondary);
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.day-btn.active {
    background: var(--color-primary);
    color: white;
}

/* ================ */
/* Toast            */
/* ================ */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--spacing-md));
    right: var(--spacing-md);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 320px;
}

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

.toast.success { border-left: 4px solid var(--color-success); }
.toast.error { border-left: 4px solid var(--color-danger); }
.toast.warning { border-left: 4px solid var(--color-warning); }

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
}

.toast-close {
    color: var(--color-text-muted);
    padding: var(--spacing-xs);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.empty-state p {
    color: var(--color-text-muted);
}

/* =================== */
/* Responsive          */
/* =================== */
@media (min-width: 768px) {
    .main-app {
        flex-direction: row;
    }
    
    .bottom-nav {
        position: static;
        flex-direction: column;
        width: var(--sidebar-width);
        height: 100vh;
        justify-content: flex-start;
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
        border-top: none;
        border-right: 1px solid var(--color-border);
        box-shadow: none;
    }
    
    .nav-item {
        flex-direction: row;
        gap: var(--spacing-sm);
        width: 100%;
        padding: var(--spacing-md);
        justify-content: flex-start;
    }
    
    .nav-item.add-btn {
        margin-top: var(--spacing-lg);
        width: 100%;
        border-radius: var(--radius-lg);
    }
    
    .main-content {
        flex: 1;
        padding: var(--spacing-xl);
        padding-bottom: var(--spacing-xl);
        max-width: none;
    }
    
    .modal-content {
        border-radius: var(--radius-xl);
        margin: auto;
        max-height: 85vh;
    }
    
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .icon-grid {
        grid-template-columns: repeat(10, 1fr);
    }
}

@media (min-width: 1024px) {
    .main-content {
        max-width: 900px;
        margin: 0 auto;
    }
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.animate-pulse { animation: pulse 0.3s ease; }
.animate-shake { animation: shake 0.3s ease; }

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .bottom-nav,
    .app-header,
    .modal {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
    }
}

/* =================== */
/* Settings Page       */
/* =================== */
.settings-page {
    max-width: 600px;
    margin: 0 auto;
}

.settings-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.settings-section h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.settings-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-md);
}

.setting-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.setting-row:first-child {
    padding-top: 0;
}

.setting-info {
    flex: 1;
}

.setting-label {
    display: block;
    font-weight: 500;
    margin-bottom: 2px;
}

.setting-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.danger-zone .settings-card {
    border-color: var(--color-danger);
    background: rgba(239, 68, 68, 0.05);
}

.settings-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* =================== */
/* Tasks Page Enhanced */
/* =================== */
.task-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.task-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
    transition: var(--transition-fast);
}

.task-item:hover {
    border-color: var(--color-primary-light);
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-name {
    text-decoration: line-through;
}

.task-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.task-checkbox:hover {
    border-color: var(--color-primary);
}

.task-checkbox.checked {
    background: var(--color-success);
    border-color: var(--color-success);
    color: white;
}

.task-info {
    flex: 1;
    min-width: 0;
}

.task-name {
    font-weight: 500;
    margin-bottom: 2px;
}

.task-due {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.task-due.overdue {
    color: var(--color-danger);
}

.task-badge {
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    background: var(--color-bg);
}

.task-badge.periodic {
    background: #d1fae5;
    color: #047857;
}

.task-badge.one-time {
    background: #fce7f3;
    color: #be185d;
}

/* Task filters */
.task-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.task-filter {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.task-filter:hover {
    border-color: var(--color-primary);
}

.task-filter.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Add task button */
.add-task-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    margin-top: var(--spacing-md);
}

.add-task-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}