/* ========================================
   HABIT TRACKER - STYLE.CSS
   Premium Dark Theme Landing + Light App
   ======================================== */

/* -------------------- CSS Variables -------------------- */
:root {
    /* Dark Theme Colors (Landing Page) */
    --dark-bg: #0a0a0b;
    --dark-bg-secondary: #111113;
    --dark-surface: #18181b;
    --dark-border: #27272a;
    --dark-text: #fafafa;
    --dark-text-secondary: #a1a1aa;
    --dark-text-muted: #71717a;
    --dark-accent: #a78bfa;
    --dark-accent-glow: rgba(167, 139, 250, 0.3);
    --dark-gold: #fbbf24;
    
    /* Light Theme Colors (App) */
    --bg-primary: #ffffff;
    --bg-secondary: #faf8f5;
    --bg-tertiary: #f5f0e8;
    --text-primary: #2d2a26;
    --text-secondary: #5c5650;
    --text-muted: #8a8279;
    --border-color: #e8e0d5;
    --accent-color: #2383e2;
    --accent-hover: #1a6cb8;
    --success-color: #0f7b6c;
    --success-bg: #dbf0ed;
    --warning-color: #d9730d;
    --checkbox-checked: #2383e2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--dark-bg);
    color: var(--dark-text);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* ========================================
   LANDING PAGE STYLES
   ======================================== */

.landing-page {
    min-height: 100vh;
}

/* -------------------- Hero Section -------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--spacing-xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://images.unsplash.com/photo-1519681393784-d120267933ba?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
    filter: brightness(0.3) saturate(0.8);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10, 10, 11, 0.7) 0%,
        rgba(10, 10, 11, 0.85) 50%,
        rgba(10, 10, 11, 0.95) 100%
    );
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(167, 139, 250, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--dark-text-secondary);
    margin-bottom: var(--spacing-xl);
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--dark-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.title-pov {
    display: block;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 500;
    color: var(--dark-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--spacing-sm);
}

.title-main {
    display: block;
    background: linear-gradient(135deg, #ffffff 0%, #a78bfa 50%, #fbbf24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--dark-text-secondary);
    font-weight: 400;
    margin-bottom: var(--spacing-2xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--dark-accent) 0%, #8b5cf6 100%);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 0 30px var(--dark-accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px var(--dark-accent-glow);
}

.btn-primary svg {
    transition: transform var(--transition-fast);
}

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-full);
    color: var(--dark-text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--dark-text-muted);
    color: var(--dark-text);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-text);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--dark-text-muted);
    margin-top: var(--spacing-xs);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--dark-border);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--dark-text-muted);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

.scroll-arrow {
    opacity: 0.5;
}

/* -------------------- Dashboard Preview Section -------------------- */
.dashboard-preview {
    padding: var(--spacing-4xl) var(--spacing-xl);
    background: var(--dark-bg-secondary);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header-landing {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(167, 139, 250, 0.1);
    border: 1px solid rgba(167, 139, 250, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--dark-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.section-title-landing {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle-landing {
    font-size: 1.125rem;
    color: var(--dark-text-muted);
}

.preview-window {
    background: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.window-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--dark-border);
}

.window-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.window-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--dark-border);
}

.window-dots span:first-child { background: #ef4444; }
.window-dots span:nth-child(2) { background: #fbbf24; }
.window-dots span:last-child { background: #22c55e; }

.window-title {
    font-size: 0.875rem;
    color: var(--dark-text-muted);
}

.preview-months {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.preview-month-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.preview-month-card:hover {
    transform: translateY(-4px);
    border-color: var(--dark-accent);
    box-shadow: 0 10px 30px rgba(167, 139, 250, 0.1);
}

.preview-month-image {
    height: 80px;
    background-size: cover;
    background-position: center;
}

.preview-month-info {
    padding: var(--spacing-md);
}

.preview-month-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark-text);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.preview-month-status {
    font-size: 0.75rem;
    color: var(--dark-text-muted);
    margin-top: var(--spacing-xs);
}

/* -------------------- Purpose Section -------------------- */
.purpose-section {
    padding: var(--spacing-4xl) var(--spacing-xl);
    background: var(--dark-bg);
    position: relative;
    overflow: hidden;
}

.purpose-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(167, 139, 250, 0.05) 0%, transparent 70%);
}

.purpose-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.purpose-quote {
    position: relative;
}

.quote-mark {
    font-size: 5rem;
    font-weight: 700;
    color: var(--dark-accent);
    opacity: 0.3;
    line-height: 1;
    position: absolute;
    top: -20px;
    left: -20px;
}

.quote-mark-end {
    left: auto;
    right: -20px;
    top: auto;
    bottom: -60px;
}

.purpose-quote p {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 500;
    color: var(--dark-text);
    font-style: italic;
    line-height: 1.4;
    padding: 0 var(--spacing-2xl);
}

.purpose-subtext {
    font-size: 1.125rem;
    color: var(--dark-text-muted);
    margin-top: var(--spacing-xl);
}

/* -------------------- Features Section -------------------- */
.features-section {
    padding: var(--spacing-4xl) var(--spacing-xl);
    background: var(--dark-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature-item {
    padding: var(--spacing-lg);
    position: relative;
}

.feature-line {
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--dark-accent), var(--dark-gold));
    border-radius: 2px;
    margin-bottom: var(--spacing-md);
}

.feature-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    font-size: 0.9375rem;
    color: var(--dark-text-muted);
    line-height: 1.6;
}

/* -------------------- Final CTA Section -------------------- */
.final-cta {
    padding: var(--spacing-4xl) var(--spacing-xl);
    background: var(--dark-bg);
    text-align: center;
    position: relative;
}

.final-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 80px;
    background: linear-gradient(to bottom, transparent, var(--dark-border));
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: var(--spacing-sm);
}

.cta-content > p {
    font-size: 1.25rem;
    color: var(--dark-text-muted);
    margin-bottom: var(--spacing-xl);
}

/* -------------------- Landing Footer -------------------- */
.landing-footer {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: var(--dark-bg-secondary);
    border-top: 1px solid var(--dark-border);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    font-size: 1.5rem;
    color: var(--dark-accent);
}

.footer-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark-text);
}

.footer-year {
    font-size: 0.875rem;
    color: var(--dark-text-muted);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
}

.footer-tagline {
    font-size: 1rem;
    color: var(--dark-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.footer-line {
    width: 60px;
    height: 1px;
    background: var(--dark-border);
    margin: 0 auto var(--spacing-lg);
}

.footer-copy {
    font-size: 0.875rem;
    color: var(--dark-text-muted);
}

/* ========================================
   APP STYLES (Light Theme)
   ======================================== */

/* -------------------- App Container -------------------- */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
}

.app-container.hidden {
    display: none !important;
}

.landing-page.hidden {
    display: none !important;
}

/* -------------------- Month View Container (Full Page) -------------------- */
.month-view-container {
    min-height: 100vh;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
}

.month-view-container.hidden {
    display: none !important;
}

.month-view-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

/* Override body background when month view is visible */
body.app-mode {
    background-color: var(--bg-secondary);
}

/* -------------------- Dashboard Header for App -------------------- */
.dashboard-header-app {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.btn-back-home {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-back-home:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn-primary-app:hover {
    background: var(--accent-hover);
}

/* -------------------- Header with Panorama -------------------- */
.header {
    text-align: center;
    padding: 0;
    margin-bottom: var(--spacing-xl);
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.header-panorama {
    width: 100%;
    height: 200px;
    background: url('https://images.unsplash.com/photo-1513635269975-59663e0ac1ad?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
    position: relative;
}

.header-panorama::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(to top, rgba(255,255,255,0.9) 0%, transparent 100%);
}

.header-content {
    padding: var(--spacing-lg) var(--spacing-xl) var(--spacing-xl);
    position: relative;
    margin-top: -40px;
}

.header-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.header-title .fire-emoji {
    font-size: 1.5rem;
}

.header-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* -------------------- Main Content -------------------- */
.main-content {
    flex: 1;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

/* -------------------- Dashboard View -------------------- */
.dashboard-view {
    animation: fadeIn 0.3s ease;
}

.months-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-md);
}

.month-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.month-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.month-card-image {
    width: 100%;
    height: 120px;
    background-size: cover;
    background-position: center;
    position: relative;
}

/* Individual month backgrounds - Beautiful World Wonders & Nature */
.month-card[data-month="0"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1477601263568-180e2c6d046e?q=80&w=600&auto=format&fit=crop'); } /* January - Snowy Alps */
.month-card[data-month="1"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1506905925346-21bda4d32df4?q=80&w=600&auto=format&fit=crop'); } /* February - Mountains above clouds */
.month-card[data-month="2"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1493976040374-85c8e12f0c0e?q=80&w=600&auto=format&fit=crop'); } /* March - Japanese Cherry Blossoms */
.month-card[data-month="3"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1490750967868-88aa4486c946?q=80&w=600&auto=format&fit=crop'); } /* April - Tulip Fields */
.month-card[data-month="4"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1501854140801-50d01698950b?q=80&w=600&auto=format&fit=crop'); } /* May - Green Hills */
.month-card[data-month="5"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1433086966358-54859d0ed716?q=80&w=600&auto=format&fit=crop'); } /* June - Waterfall */
.month-card[data-month="6"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1476514525535-07fb3b4ae5f1?q=80&w=600&auto=format&fit=crop'); } /* July - Lake & Mountains */
.month-card[data-month="7"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1469474968028-56623f02e42e?q=80&w=600&auto=format&fit=crop'); } /* August - Mountain Sunrise */
.month-card[data-month="8"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1508193638397-1c4234db14d8?q=80&w=600&auto=format&fit=crop'); } /* September - Autumn Forest */
.month-card[data-month="9"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1506744038136-46273834b3fb?q=80&w=600&auto=format&fit=crop'); } /* October - Autumn Lake Reflection */
.month-card[data-month="10"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1509316975850-ff9c5deb0cd9?q=80&w=600&auto=format&fit=crop'); } /* November - Misty Forest */
.month-card[data-month="11"] .month-card-image { background-image: url('https://images.unsplash.com/photo-1419242902214-272b3f66ee7a?q=80&w=600&auto=format&fit=crop'); } /* December - Starry Night */

.month-card-content {
    padding: var(--spacing-md);
}

.month-card-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.month-card-name .month-icon {
    font-size: 1rem;
}

.month-card-progress {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.month-card-progress.has-data {
    color: var(--success-color);
    font-weight: 500;
}

/* -------------------- Month View -------------------- */
.month-view {
    animation: fadeIn 0.3s ease;
}

/* Nature Background for Month View */
.month-view-header {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.month-view-panorama {
    width: 100%;
    height: 180px;
    background: url('https://images.unsplash.com/photo-1441974231531-c6227db76b6e?q=80&w=2560&auto=format&fit=crop') center/cover no-repeat;
    position: relative;
}

.month-view-panorama::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80%;
    background: linear-gradient(to top, rgba(255,255,255,1) 0%, rgba(255,255,255,0.8) 40%, transparent 100%);
}

.month-view-content {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    margin-top: -60px;
    position: relative;
}

.hidden {
    display: none !important;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-lg);
}

.back-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.month-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.month-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.month-year {
    font-size: 1.25rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* -------------------- Habits Section -------------------- */
.habits-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.habits-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.habits-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.add-habit-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-color);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.add-habit-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

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

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 0.875rem;
}

/* -------------------- Habit Table -------------------- */
.table-container {
    overflow-x: auto;
    margin: 0 calc(-1 * var(--spacing-lg));
    padding: 0 var(--spacing-lg);
}

.habit-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
}

.habit-table th,
.habit-table td {
    padding: var(--spacing-sm);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.habit-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.habit-table th:first-child {
    text-align: left;
    min-width: 200px;
    position: sticky;
    left: 0;
    z-index: 20;
    background: var(--bg-secondary);
}

.habit-table td:first-child {
    text-align: left;
    font-weight: 500;
    color: var(--text-primary);
    position: sticky;
    left: 0;
    background: var(--bg-primary);
    z-index: 5;
}

.habit-table .date-cell {
    min-width: 36px;
    font-size: 0.75rem;
}

.habit-table tbody tr:hover {
    background: var(--bg-secondary);
}

.habit-table tbody tr:hover td:first-child {
    background: var(--bg-secondary);
}

/* Habit Name Cell */
.habit-name-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.delete-habit-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.habit-table tbody tr:hover .delete-habit-btn {
    opacity: 1;
}

.delete-habit-btn:hover {
    color: #e03e3e;
    background: #fce8e8;
}

/* -------------------- Custom Checkbox -------------------- */
.checkbox-cell {
    position: relative;
}

.habit-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    background: var(--bg-primary);
}

.habit-checkbox:hover {
    border-color: var(--accent-color);
    background: rgba(35, 131, 226, 0.05);
}

.habit-checkbox:checked {
    background: var(--checkbox-checked);
    border-color: var(--checkbox-checked);
}

.habit-checkbox:checked::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.habit-checkbox:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(35, 131, 226, 0.2);
}

/* Completion Cell */
.completion-cell {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 70px;
}

.completion-cell.high {
    color: var(--success-color);
}

.completion-cell.medium {
    color: var(--warning-color);
}

.completion-cell.low {
    color: #e03e3e;
}

/* -------------------- Progress Section -------------------- */
.progress-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.progress-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.goal-banner {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--success-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

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

.goal-text {
    font-weight: 600;
    color: var(--success-color);
    font-size: 0.875rem;
}

.charts-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
}

.chart-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.chart-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.pie-chart-container {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto;
}

.pie-center-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.line-chart-container {
    height: 200px;
}

/* -------------------- Modal -------------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

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

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.modal-body input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.modal-body input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(35, 131, 226, 0.1);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

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

/* -------------------- Buttons -------------------- */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

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

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

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

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* -------------------- Footer -------------------- */
.footer {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* -------------------- Animations -------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* -------------------- Responsive Design -------------------- */
@media (max-width: 1024px) {
    .charts-container {
        grid-template-columns: 1fr;
    }
    
    .chart-card-wide {
        order: -1;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .header-title {
        font-size: 1.75rem;
    }
    
    .header-subtitle {
        font-size: 1rem;
    }
    
    .months-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .month-card {
        padding: var(--spacing-md);
    }
    
    .habits-section {
        padding: var(--spacing-md);
    }
    
    .habits-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .add-habit-btn {
        width: 100%;
        justify-content: center;
    }
    
    .habit-table th:first-child,
    .habit-table td:first-child {
        min-width: 140px;
    }
    
    .progress-section {
        padding: var(--spacing-md);
    }
    
    .pie-chart-container {
        width: 180px;
        height: 180px;
    }
    
    .line-chart-container {
        height: 180px;
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 1.5rem;
    }
    
    .months-grid {
        grid-template-columns: 1fr;
    }
    
    .month-header {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .month-title {
        font-size: 1.5rem;
    }
    
    .habit-checkbox {
        width: 18px;
        height: 18px;
    }
    
    .habit-checkbox:checked::after {
        left: 4px;
        top: 1px;
        width: 4px;
        height: 8px;
    }
    
    /* Landing page mobile */
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    
    .preview-months {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quote-mark {
        font-size: 3rem;
        position: static;
        display: block;
    }
    
    .quote-mark-end {
        display: none;
    }
    
    .purpose-quote p {
        padding: 0;
    }
}

/* -------------------- Scrollbar Styling -------------------- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

/* Dark scrollbar for landing page */
.landing-page ::-webkit-scrollbar-track {
    background: var(--dark-bg-secondary);
}

.landing-page ::-webkit-scrollbar-thumb {
    background: var(--dark-border);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* -------------------- Rotating Text Animation -------------------- */
.title-main {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* -------------------- Scroll Fade In Animation -------------------- */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* -------------------- Print Styles -------------------- */
@media print {
    .back-btn,
    .add-habit-btn,
    .delete-habit-btn,
    .modal-overlay,
    .landing-page {
        display: none !important;
    }
    
    .app-container {
        max-width: 100%;
        display: flex !important;
    }
    
    .habit-table th:first-child,
    .habit-table td:first-child {
        position: static;
    }
}

/* ========================================
   PWA INSTALL BUTTON STYLES
   Non-intrusive install prompt
   ======================================== */

.pwa-install-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    
    display: flex;
    align-items: center;
    gap: 8px;
    
    padding: 12px 20px;
    
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    color: white;
    
    border: none;
    border-radius: 50px;
    
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 14px;
    font-weight: 600;
    
    cursor: pointer;
    
    box-shadow: 
        0 4px 15px rgba(167, 139, 250, 0.4),
        0 2px 6px rgba(0, 0, 0, 0.1);
    
    transform: translateY(100px);
    opacity: 0;
    
    transition: 
        transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
        opacity 0.3s ease,
        box-shadow 0.2s ease,
        background 0.2s ease;
}

.pwa-install-btn.pwa-visible {
    transform: translateY(0);
    opacity: 1;
}

.pwa-install-btn.pwa-hidden {
    transform: translateY(100px);
    opacity: 0;
    pointer-events: none;
}

.pwa-install-btn:hover {
    background: linear-gradient(135deg, #b89dfc 0%, #8b5cf6 100%);
    box-shadow: 
        0 6px 20px rgba(167, 139, 250, 0.5),
        0 3px 10px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.pwa-install-btn:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 10px rgba(167, 139, 250, 0.3),
        0 1px 4px rgba(0, 0, 0, 0.1);
}

.pwa-install-btn svg {
    flex-shrink: 0;
}

/* Hide install button on very small screens or when in standalone mode */
@media (max-width: 360px) {
    .pwa-install-btn span {
        display: none;
    }
    
    .pwa-install-btn {
        padding: 14px;
        border-radius: 50%;
    }
}

/* Standalone mode adjustments */
.pwa-standalone .pwa-install-btn {
    display: none !important;
}

/* Safe area insets for notched devices */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .pwa-install-btn {
        bottom: calc(24px + env(safe-area-inset-bottom));
        right: calc(24px + env(safe-area-inset-right));
    }
}