/* ========================================
   ReAttune Landing Page Styles
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Dark Mode (Default) */
    --bg-primary: #0A0E1A;
    --bg-secondary: #121212;
    --bg-card: #1A1F2E;
    --bg-elevated: #1E2433;

    /* Text */
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --text-tertiary: #6B7280;

    /* Accents */
    --calm-blue: #4A90D9;
    --serene-teal: #2DD4BF;
    --warm-coral: #F87171;
    --soft-gold: #FBBF24;
    --gentle-purple: #A78BFA;

    /* Session Colors */
    --anxiety-blue: #60A5FA;
    --focus-green: #34D399;
    --sleep-purple: #818CF8;
    --stress-teal: #2DD4BF;
    --depression-gold: #FBBF24;
    --panic-pink: #F472B6;
    --mood-orange: #FB923C;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--calm-blue), var(--gentle-purple));
    --gradient-accent: linear-gradient(135deg, var(--serene-teal), var(--calm-blue));

    /* Spacing */
    --section-padding: 120px;
    --container-width: 1200px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--serene-teal);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    background: var(--gradient-accent);
    color: var(--bg-primary) !important;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.nav-cta:hover {
    opacity: 0.9;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
}

.mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-menu.active {
    display: flex;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

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

.wave {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px solid rgba(45, 212, 191, 0.1);
    animation: wave-pulse 4s ease-in-out infinite;
}

.wave-1 {
    width: 400px;
    height: 400px;
    animation-delay: 0s;
}

.wave-2 {
    width: 600px;
    height: 600px;
    animation-delay: 1s;
}

.wave-3 {
    width: 800px;
    height: 800px;
    animation-delay: 2s;
}

@keyframes wave-pulse {
    0%, 100% {
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.1;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.3;
    animation: orb-float 8s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--calm-blue);
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--gentle-purple);
    bottom: 20%;
    right: -5%;
    animation-delay: 2s;
}

.orb-3 {
    width: 200px;
    height: 200px;
    background: var(--serene-teal);
    top: 60%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes orb-float {
    0%, 100% {
        transform: translate(0, 0);
    }
    25% {
        transform: translate(20px, -20px);
    }
    50% {
        transform: translate(0, -40px);
    }
    75% {
        transform: translate(-20px, -20px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid rgba(45, 212, 191, 0.3);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--serene-teal);
    margin-bottom: 24px;
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--serene-teal);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

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

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.app-store-badge {
    display: inline-block;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.app-store-badge svg {
    height: 48px;
    width: auto;
}

.app-store-badge:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.app-store-badge.large svg {
    height: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 1rem;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--serene-teal);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.hero-visual {
    position: absolute;
    right: -200px;
    top: 50%;
    transform: translateY(-50%);
    display: none;
}

@media (min-width: 1200px) {
    .hero {
        justify-content: flex-start;
        padding-left: 10%;
    }

    .hero-content {
        text-align: left;
    }

    .hero-actions {
        justify-content: flex-start;
    }

    .hero-stats {
        justify-content: flex-start;
    }

    .hero-visual {
        display: block;
    }
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: var(--bg-card);
    border-radius: 40px;
    border: 8px solid #2a2a2a;
    padding: 12px;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.frequency-visualizer {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.freq-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid var(--serene-teal);
    animation: freq-pulse 3s ease-in-out infinite;
}

.freq-ring-1 {
    width: 100%;
    height: 100%;
    opacity: 0.3;
    animation-delay: 0s;
}

.freq-ring-2 {
    width: 70%;
    height: 70%;
    opacity: 0.5;
    animation-delay: 0.5s;
}

.freq-ring-3 {
    width: 40%;
    height: 40%;
    opacity: 0.7;
    animation-delay: 1s;
}

@keyframes freq-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.6;
    }
}

.freq-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

.freq-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--serene-teal);
}

.freq-unit {
    font-size: 1rem;
    color: var(--text-tertiary);
}

/* ========================================
   Section Styles
   ======================================== */
section {
    padding: var(--section-padding) 24px;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    background: rgba(74, 144, 217, 0.1);
    color: var(--calm-blue);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-medium);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--accent, var(--calm-blue));
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Sessions Section
   ======================================== */
.sessions {
    background: var(--bg-primary);
}

.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.session-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.session-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--session-color);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.session-card:hover {
    transform: translateX(4px);
    border-color: var(--session-color);
}

.session-card:hover::before {
    opacity: 1;
}

.session-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--session-color);
}

.session-icon svg {
    width: 24px;
    height: 24px;
}

.session-info {
    flex: 1;
}

.session-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.session-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.session-freq {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-family: 'SF Mono', 'Monaco', monospace;
}

.session-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.session-badge.free {
    background: rgba(45, 212, 191, 0.2);
    color: var(--serene-teal);
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    background: var(--bg-secondary);
}

.steps {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 280px;
    max-width: 360px;
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin: 0 auto 24px;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Science Section
   ======================================== */
.science {
    background: var(--bg-primary);
}

.science-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

@media (max-width: 900px) {
    .science-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

.science-text h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.science-text > p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

.science-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.science-list li {
    padding-left: 28px;
    position: relative;
    line-height: 1.6;
}

.science-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    background: var(--serene-teal);
    border-radius: 50%;
}

.science-list li strong {
    color: var(--text-primary);
}

.science-visual {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.brainwave-demo {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.brainwave-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.brainwave {
    height: 40px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--serene-teal) 25%,
        transparent 50%,
        var(--serene-teal) 75%,
        transparent 100%
    );
    background-size: 200% 100%;
    border-radius: var(--radius-sm);
    opacity: 0.3;
    animation: brainwave-flow var(--speed) linear infinite;
}

@keyframes brainwave-flow {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: 0% 0;
    }
}

/* ========================================
   Download CTA Section
   ======================================== */
.download-cta {
    background: var(--bg-card);
    text-align: center;
}

.cta-content h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.cta-content > p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 32px;
}

.cta-note {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 24px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 64px 24px 32px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 64px;
    flex-wrap: wrap;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.disclaimer {
    margin-top: 16px;
    font-size: 0.75rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }

    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 120px 24px 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .sessions-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        flex-direction: column;
    }

    .footer-links {
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .feature-card {
        padding: 24px;
    }

    .session-card {
        flex-direction: column;
        text-align: center;
    }

    .session-badge {
        position: static;
        margin-top: 12px;
    }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--serene-teal);
    outline-offset: 2px;
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .nav,
    .hero-background,
    .hero-visual,
    .download-cta {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    section {
        padding: 40px 0;
    }
}