/* CampusBond - Smart Attendance Management App */
/* Design System: Coastal Fog + Academic Minimalism */

:root {
    /* Color Palette - Coastal Fog with Academic warmth */
    --bg-primary: #F7F5F2;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #E3EDF7;
    --text-primary: #0A1929;
    --text-secondary: #4A6670;
    --text-muted: #8FA3B0;
    --accent-primary: #2E5090;
    --accent-secondary: #A8C4E0;
    --accent-warm: #C9A87C;
    --success: #2D6A1E;
    --warning: #B87333;
    --danger: #B5563E;
    
    /* Typography */
    --font-display: 'DM Serif Display', serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(10, 25, 41, 0.06);
    --shadow-md: 0 4px 20px rgba(10, 25, 41, 0.08);
    --shadow-lg: 0 8px 40px rgba(10, 25, 41, 0.12);
    --shadow-xl: 0 20px 60px rgba(10, 25, 41, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.2;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-xl);
    background: rgba(247, 245, 242, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(143, 163, 176, 0.15);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-primary);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--accent-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

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

.btn-primary:hover {
    background: #1e3a6f;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(80px + var(--space-xl)) var(--space-xl) var(--space-xl);
    gap: var(--space-2xl);
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--space-md);
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-warm) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(143, 163, 176, 0.2);
}

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

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(143, 163, 176, 0.3);
}

/* Hero Visual - Phone Mockup */
.hero-visual {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 320px;
    height: 640px;
    background: var(--text-primary);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 32px;
    overflow: hidden;
    padding: var(--space-md);
}

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

.app-greeting {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.app-avatar {
    width: 36px;
    height: 36px;
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.attendance-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-sm);
}

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

.attendance-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.attendance-status {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-weight: 600;
}

.attendance-status.good {
    background: rgba(45, 106, 30, 0.1);
    color: var(--success);
}

.attendance-percentage {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: var(--space-xs);
}

.attendance-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.attendance-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-warm));
    border-radius: 4px;
    transition: width 1s ease;
}

.attendance-target {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.today-classes {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.class-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(143, 163, 176, 0.2);
}

.class-item:last-child {
    border-bottom: none;
}

.class-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    min-width: 45px;
}

.class-info {
    flex: 1;
}

.class-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.class-room {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.class-status {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.class-status.present {
    background: rgba(45, 106, 30, 0.1);
    color: var(--success);
}

.class-status.upcoming {
    background: rgba(46, 80, 144, 0.1);
    color: var(--accent-primary);
}

/* Floating Cards */
.floating-card {
    position: absolute;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    right: -20px;
    animation-delay: 0s;
}

.card-2 {
    bottom: 25%;
    left: -30px;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.card-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.card-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Features Section */
.features {
    padding: var(--space-2xl) var(--space-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.feature-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid rgba(143, 163, 176, 0.1);
}

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

.feature-card.large {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: white;
}

.dashboard-icon { background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary)); }
.subject-icon { background: linear-gradient(135deg, var(--accent-warm), #D4896A); }
.timetable-icon { background: linear-gradient(135deg, var(--success), #4CAF50); }
.calculator-icon { background: linear-gradient(135deg, var(--warning), #D4A574); }
.notes-icon { background: linear-gradient(135deg, #7D3C50, #B5563E); }

.feature-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.feature-preview {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

.mini-dashboard {
    display: flex;
    gap: var(--space-sm);
}

.mini-stat {
    flex: 1;
    text-align: center;
    padding: var(--space-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.mini-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.mini-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent-primary);
}

/* How It Works */
.how-it-works {
    padding: var(--space-2xl) var(--space-xl);
    background: var(--bg-secondary);
}

.steps-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.step-card {
    display: grid;
    grid-template-columns: 80px 1fr 300px;
    gap: var(--space-lg);
    align-items: center;
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(143, 163, 176, 0.15);
}

.step-number {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--accent-primary);
    opacity: 0.3;
    line-height: 1;
}

.step-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.step-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.step-phone {
    width: 180px;
    height: 280px;
    background: var(--text-primary);
    border-radius: 24px;
    padding: 8px;
}

.step-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 18px;
    padding: var(--space-sm);
}

.form-field {
    margin-bottom: var(--space-sm);
}

.form-field label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    background: var(--bg-secondary);
    border: 1px solid rgba(143, 163, 176, 0.2);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.subject-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    justify-content: center;
}

.subject-tag {
    background: var(--accent-primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
}

.tracking-demo {
    width: 100%;
}

.track-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.track-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-warm));
    border-radius: 6px;
}

.track-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    font-weight: 600;
}

.track-status {
    color: var(--success);
}

/* Download Section */
.download {
    padding: var(--space-2xl) var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-2xl);
    max-width: 1400px;
    margin: 0 auto;
}

.download-content {
    flex: 1;
}

.download-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.download-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.download-buttons {
    display: flex;
    gap: var(--space-md);
}

.store-button {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 1rem 1.5rem;
    background: var(--text-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
}

.store-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.store-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.store-small {
    font-size: 0.7rem;
    opacity: 0.8;
}

.store-large {
    font-size: 1rem;
    font-weight: 600;
}

.download-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.app-screens {
    position: relative;
    width: 400px;
    height: 400px;
}

.screen-card {
    position: absolute;
    width: 180px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.screen-1 {
    top: 0;
    left: 0;
    transform: rotate(-5deg);
}

.screen-2 {
    top: 40px;
    right: 0;
    transform: rotate(3deg);
}

.screen-3 {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) rotate(0deg);
}

.screen-header {
    background: var(--accent-primary);
    color: white;
    padding: var(--space-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.screen-content {
    padding: var(--space-sm);
}

.screen-percent {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--accent-primary);
    text-align: center;
}

.screen-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    margin-top: var(--space-xs);
}

.screen-bar div {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-warm));
    border-radius: 3px;
}

.screen-subject {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(143, 163, 176, 0.2);
}

.screen-class {
    font-size: 0.8rem;
    padding: 4px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(143, 163, 176, 0.2);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--space-2xl) var(--space-xl) var(--space-lg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.footer-brand .logo-icon {
    background: var(--accent-warm);
    margin-bottom: var(--space-sm);
}

.footer-brand .logo-text {
    color: var(--bg-primary);
    display: block;
    margin-bottom: var(--space-xs);
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: var(--space-2xl);
}

.footer-column h4 {
    color: var(--bg-primary);
    font-size: 1rem;
    margin-bottom: var(--space-md);
    font-family: var(--font-body);
    font-weight: 600;
}

.footer-column a {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: var(--space-xs);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--accent-warm);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(143, 163, 176, 0.2);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: calc(100px + var(--space-xl));
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-card.large {
        grid-column: span 2;
    }
    
    .step-card {
        grid-template-columns: 60px 1fr;
    }
    
    .step-visual {
        display: none;
    }
    
    .download {
        flex-direction: column;
        text-align: center;
    }
    
    .download-buttons {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--space-sm);
    }
    
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: calc(80px + var(--space-md)) var(--space-md) var(--space-md);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card.large {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
    
    .step-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .step-number {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: var(--space-lg);
    }
    
    .floating-card {
        display: none;
    }
}

/* Scroll Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }