/* =============================================================================
   Synapse Marketing Website - CSS
   Dark tech-focused theme with cyan accents
   Mobile-first responsive design
   ============================================================================= */

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

:root {
    /* Brand Colors */
    --primary-bg: #111827;
    --secondary-bg: #1F2937;
    --card-bg: #374151;
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-muted: #9CA3AF;
    --accent-primary: #22D3EE;
    --accent-hover: #0891B2;
    
    /* Gradients */
    --gradient-accent: linear-gradient(135deg, #22D3EE 0%, #0891B2 100%);
    --gradient-bg: linear-gradient(135deg, #111827 0%, #1F2937 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 5rem;
    --spacing-5xl: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(34, 211, 238, 0.3);
    
    /* Borders */
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Base Elements */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

@media (min-width: 768px) {
    h1 { font-size: var(--font-size-5xl); }
    h2 { font-size: var(--font-size-4xl); }
    h3 { font-size: var(--font-size-3xl); }
}

@media (min-width: 1024px) {
    h1 { font-size: var(--font-size-6xl); }
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    border-radius: var(--border-radius-lg);
    flex-direction: column;
    gap: var(--spacing-xs);
}

.btn-full {
    width: 100%;
}

.btn-subtitle {
    font-size: var(--font-size-sm);
    font-weight: 400;
    opacity: 0.9;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(55, 65, 81, 0.3);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-text {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Logo image sizing (increase by ~50% while remaining responsive) */
.logo-img {
    height: 42px; /* roughly 1.5x the previous 28px */
    width: auto;
    display: block;
}
@media (max-width: 640px) {
    .logo-img { height: 36px; }
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-4xl)) 0 var(--spacing-5xl);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.45; /* slightly more visible */
}

.hero-video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(17, 24, 39, 0.95) 0%, rgba(31, 41, 55, 0.8) 100%);
}

/* Hero logo: large, static, responsive (supports large-scale branding) */
.hero-logo {
    display: block;
    width: 240px;
    max-width: 80%;
    height: auto;
    margin: 0 auto;
    transition: transform 0.35s ease, width 0.35s ease;
    transform-origin: center center;
}
@media (min-width: 768px) {
    .hero-logo { width: 360px; }
}
@media (min-width: 1200px) {
    .hero-logo { width: 420px; }
}
/* On large screens scale the hero logo for strong brand presence (reduced) */
@media (min-width: 1024px) {
    /* Larger explicit width for desktop hero logo */
    .hero-logo { transform: none; width: 640px; max-width: 90%; }
}
@media (min-width: 1400px) {
    .hero-logo { width: 900px; }
}

/* Footer logo sizing */
.footer-logo {
    height: 72px; /* reduced to avoid oversized footer logo */
    width: auto;
    display: block;
    margin: 0 auto;
}

/* Footer brand text (used where logo replaced by word 'Synapse') */
.footer-brand {
    font-weight: 700;
    color: inherit;
    display: inline; /* match surrounding text flow */
    margin-right: 0; /* remove extra gap between brand and following word */
    line-height: 1; /* ensure consistent baseline alignment */
    vertical-align: baseline; /* align with text baseline */
    font-size: 1rem; /* keep same size as body text */
}

/* Cyan CTA button used for Join Waitlist */
.btn-cta-cyan {
    background: var(--accent-primary);
    color: var(--primary-bg);
    box-shadow: var(--shadow-glow);
    border-radius: var(--border-radius-lg);
    padding: 0.85rem 1.25rem;
    font-weight: 700;
}
.btn-cta-cyan:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(34,211,238,0.18), var(--shadow-glow); }

/* App Showcase / Screenshots */
.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    align-items: center;
}
.screenshot-card {
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(2,6,23,0.6), 0 2px 8px rgba(0,0,0,0.4);
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
    transform: translateZ(0);
}
.screenshot-img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
    border-radius: 0.75rem;
}

/* Center screenshots content and increase visual size */
.screenshot-card { display:flex; align-items:center; justify-content:center; }
.screenshot-card .screenshot-img { width: 100%; max-width: 95%; height: auto; }

/* Mobile: make screenshots horizontally scrollable with snap */
@media (max-width: 768px) {
    .screenshot-gallery {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 1rem;
        padding-bottom: 0.5rem;
    }
    .screenshot-card {
        min-width: 90%;
        flex: 0 0 90%;
        scroll-snap-align: center;
    }
}

@media (min-width: 1200px) {
    /* Keep screenshots parallel on very wide screens */
    .screenshot-card { transform: none; }
}

/* Center logo in navbar (stacked header) */
.nav .container { position: relative; }
.logo-center {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

/* Make logo larger and keep responsive; scale up on large screens */
.logo-img {
    height: 54px; /* base desktop size */
    width: auto;
    display: block;
}
@media (max-width: 640px) {
    .logo-img { height: 44px; }
}
@media (min-width: 1024px) {
    /* ~300% scale on wide screens for strong brand presence */
    .logo-img { height: 240px; }
}

@media (min-width: 1024px) {
    /* make room under the large logo so hero text isn't overlapped */
    .hero { padding-top: 280px; }
}

/* Increase screenshot visual size on desktop */
.screenshot-card {
    justify-self: center;
    max-width: 95%;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center top, rgba(34, 211, 238, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 2;
}

.hero-content {
    display: grid;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 3;
}

@media (min-width: 1024px) {
    .hero-content {
        /* Use a single centered column to avoid a two-column split on desktop */
        grid-template-columns: 1fr;
        gap: var(--spacing-4xl);
        justify-items: center;
        text-align: center;
        max-width: 1200px;
    }

    /* Force hero to stack vertically to prevent any lingering two-column layout */
    .hero {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
}

.hero-title {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

@media (min-width: 768px) {
    .hero-subtitle {
        font-size: var(--font-size-xl);
    }
}

.hero-cta {
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.trust-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.trust-icon {
    font-size: var(--font-size-base);
}
/* Mobile adjustments: center hero content and reduce top padding to avoid truncation */
@media (max-width: 767px) {
    .hero {
        padding-top: 1rem;
        padding-bottom: 1.5rem;
        min-height: auto !important;
        align-items: flex-start;
    }
    .hero-content { gap: 1rem; }
    .hero .hero-mockup .mockup-img.absolute { position: static; transform: none; left: auto; top: auto; margin: 0 auto; display: block; width: 100%; height: auto; }
    .hero-logo { width: 160px; }
    .hero-mockup > div { width: 95% !important; height: auto !important; }
}

/* Comparison card logo: emphasized sizing across breakpoints */
.compare-logo { height: 220px; width: auto; display: block; }
@media (min-width: 640px) {
    .compare-logo { height: 300px; }
}
@media (min-width: 1024px) {
    .compare-logo { height: 420px; }
}
@media (min-width: 1400px) {
    .compare-logo { height: 520px; }
}

/* Device Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.device-mockup {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(55, 65, 81, 0.5);
    max-width: 300px;
    width: 100%;
}

/* Hero mockup + watch silhouette */
.hero-mockup { display:flex; justify-content:center; }
.hero-mockup .watch-silhouette {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: linear-gradient(180deg, rgba(17,24,39,0.7), rgba(31,41,55,0.6));
    border: 6px solid rgba(255,255,255,0.03);
    box-shadow: 0 30px 60px rgba(2,6,23,0.6);
    filter: blur(2px);
    transform: translateY(8px) scale(1);
}
.hero-mockup .mockup-img {
    width: 300px;
    border-radius: 1rem;
    box-shadow: 0 28px 48px rgba(2,6,23,0.6);
    z-index: 5;
}
@media (min-width: 768px) {
    .hero-mockup .watch-silhouette { width: 380px; height: 380px; }
    .hero-mockup .mockup-img { width: 420px; }
}
@media (min-width: 1200px) {
    .hero-mockup .watch-silhouette { width: 460px; height: 460px; }
    .hero-mockup .mockup-img { width: 520px; }
}

/* Comparison / Problem grid */
.comparison-grid { margin-top: 1rem; }
.compare-card { min-height: 120px; }
.compare-card h4 { font-size: 1.125rem; }
.best-card { border: 2px solid var(--accent-primary); box-shadow: var(--shadow-glow); }

/* Feature cards */
.feature-card .feature-icon { font-size: 1.75rem; margin-bottom: 0.5rem; }
.feature-card p { color: var(--text-secondary); }

/* How It Works grid styles */
.how-steps-grid { display: grid; gap: 1.25rem; }
.how-step { position: relative; overflow: hidden; transition: transform 0.25s ease; }
.how-step:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.how-step-number { width:56px; height:56px; border-radius:9999px; margin:0 auto; background:var(--accent-primary); color:var(--primary-bg); display:flex; align-items:center; justify-content:center; font-weight:700; font-size:1.25rem; box-shadow: 0 6px 18px rgba(34,211,238,0.12); }
.how-step p { color: var(--text-secondary); }

@media (max-width: 767px) {
    .how-steps-grid { grid-template-columns: 1fr; }
}

/* How it works steps */
.how-steps li { list-style: none; }
.how-steps li + li { margin-top: 0.75rem; }
.how-steps strong { color: var(--text-primary); }

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

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: conic-gradient(var(--accent-primary) 0deg 313deg, rgba(55, 65, 81, 0.3) 313deg 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    width: 90px;
    height: 90px;
    background: var(--secondary-bg);
    border-radius: 50%;
}

.score-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.score-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

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

.insight-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(55, 65, 81, 0.3);
    border-radius: var(--border-radius);
}

/* --- Custom tweaks requested by product --- */
/* Responsive logo sizing (large on desktop, medium on tablet, constrained on mobile) */
.logo-link img,
.logo-mark,
header a img {
    width: 220px !important;
    height: auto !important;
    max-height: 80px;
}

@media (min-width: 768px) {
    .logo-link img,
    .logo-mark,
    header a img {
        width: 360px !important;
        max-height: 100px;
    }
}

@media (min-width: 1200px) {
    .logo-link img,
    .logo-mark,
    header a img {
        width: 480px !important;
        max-height: 120px;
    }
}

/* Darker email input so typed text is clearly visible */
input[type="email"] {
    background-color: #0b1220 !important; /* darker than card */
    color: #ffffff !important; /* ensure high contrast for typed text */
    caret-color: var(--accent-primary);
}

input[type="email"]::placeholder { color: #9CA3AF; }

/* Keep inputs border-visible on focus */
input[type="email"]:focus { box-shadow: 0 0 0 3px rgba(34,211,238,0.06); }

/* Stack nav on small screens so logo has room above the CTA button */
@media (max-width: 640px) {
    .nav-content {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
    .nav-cta {
        width: 100%;
        display: flex;
        justify-content: center;
    }
    .nav-cta .btn {
        width: auto;
    }
}

/* Center grid items for the 3-col features grid so the primary card appears centered */
[class*="md:grid-cols-3"] {
    justify-items: center;
}

.insight-icon {
    font-size: var(--font-size-lg);
}

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

/* App Demo Video Section */
.app-demo {
    padding: var(--spacing-5xl) 0;
    background: var(--primary-bg);
}

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

.demo-video-container {
    margin-top: var(--spacing-3xl);
    position: relative;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.video-player {
    position: relative;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: var(--secondary-bg);
}

.demo-video {
    width: 100%;
    height: auto;
    display: block;
}

.video-play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    transition: transform var(--transition-base);
    z-index: 2;
}

.video-play-button:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.video-player.playing .video-play-button {
    opacity: 0;
    pointer-events: none;
}

/* Comparison Section */
.comparison-section {
    padding: var(--spacing-5xl) 0;
    background: var(--secondary-bg);
    overflow: hidden;
}

.comparison-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.comparison-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    font-size: var(--font-size-3xl);
    line-height: 1.2;
}

@media (min-width: 768px) {
    .comparison-title {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-xl);
    }
}

.comparison-old {
    color: var(--text-muted);
    text-decoration: line-through;
}

.comparison-vs {
    color: var(--accent-primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

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

.comparison-content {
    display: grid;
    gap: var(--spacing-2xl);
    align-items: center;
    grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
    .comparison-content {
        grid-template-columns: 1fr auto 1fr;
        gap: var(--spacing-3xl);
    }
}

.comparison-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(55, 65, 81, 0.5);
    transition: transform var(--transition-base);
}

.comparison-card:hover {
    transform: translateY(-4px);
}

.comparison-device {
    margin-bottom: var(--spacing-xl);
    display: flex;
    justify-content: center;
}

.device-screen {
    width: 200px;
    height: 150px;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.device-screen.generic {
    background: #374151;
    border: 2px solid #4B5563;
}

.device-screen.synapse {
    background: var(--gradient-bg);
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.2);
}

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

.chart-bars {
    display: flex;
    align-items: end;
    justify-content: center;
    gap: var(--spacing-xs);
    height: 60px;
    margin-bottom: var(--spacing-md);
}

.bar {
    width: 12px;
    background: #6B7280;
    border-radius: 2px;
    transition: height var(--transition-base);
}

.chart-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

.synapse-insight {
    text-align: center;
    padding: var(--spacing-sm);
}

.insight-score {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.insight-text {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.insight-recommendation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--accent-primary);
}

.comparison-arrow {
    display: none;
}

@media (min-width: 1024px) {
    .comparison-arrow {
        display: flex;
        justify-content: center;
        align-items: center;
    }
}

.comparison-text h3 {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.comparison-list {
    list-style: none;
    padding: 0;
}

.comparison-list li {
    padding: var(--spacing-sm) 0;
    position: relative;
    padding-left: var(--spacing-lg);
}

.comparison-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

.old-way .comparison-list li::before {
    color: var(--text-muted);
}

/* Interactive Features Showcase */
.features-showcase {
    padding: var(--spacing-5xl) 0;
    background: var(--primary-bg);
}

.features-tabs {
    margin-top: var(--spacing-3xl);
}

.tab-navigation {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-3xl);
    background: var(--secondary-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(55, 65, 81, 0.5);
}

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

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
}

.tab-pane.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.feature-demo {
    display: grid;
    gap: var(--spacing-3xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .feature-demo {
        grid-template-columns: 1fr 1fr;
    }
}

.feature-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.feature-description h3 {
    margin-bottom: var(--spacing-md);
}

.feature-benefits {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-lg);
}

.feature-benefits li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

/* Animated Charts and Visualizations */
.sleep-chart {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    min-width: 300px;
}

.sleep-stages {
    display: flex;
    height: 60px;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.stage {
    flex: 1;
    position: relative;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.stage:hover {
    transform: scaleY(1.1);
}

.stage.deep { background: #1E40AF; }
.stage.rem { background: #7C3AED; }
.stage.light { background: #0891B2; }
.stage.wake { background: #DC2626; }

.chart-insight {
    text-align: center;
    color: var(--accent-primary);
    font-weight: 500;
    margin: 0;
}

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

.meter-arc {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: conic-gradient(var(--accent-primary) 0deg var(--fill, 87%), rgba(55, 65, 81, 0.3) var(--fill, 87%) 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    position: relative;
}

.meter-arc::before {
    content: '';
    position: absolute;
    width: 160px;
    height: 160px;
    background: var(--primary-bg);
    border-radius: 50%;
}

.meter-score {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.meter-status {
    color: var(--accent-primary);
    font-weight: 500;
    margin: 0;
}

.training-guide {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    min-width: 300px;
}

.guide-header {
    text-align: center;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.intensity-bar {
    display: flex;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.intensity-zone {
    flex: 1;
    padding: var(--spacing-md);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
}

.intensity-zone.high { background: #DC2626; }
.intensity-zone.moderate { background: #D97706; }
.intensity-zone.low { background: #059669; }

.intensity-zone.active {
    background: var(--accent-primary);
    color: var(--primary-bg);
    transform: scale(1.05);
}

.training-recommendation {
    text-align: center;
    color: var(--accent-primary);
    font-weight: 500;
    margin: 0;
    font-size: var(--font-size-sm);
}

.trends-chart {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    min-width: 300px;
}

.trend-line {
    margin-bottom: var(--spacing-lg);
}

.trend-svg {
    width: 100%;
    height: 100px;
}

.trend-insight {
    text-align: center;
    color: var(--accent-primary);
    font-weight: 500;
    margin: 0;
}

/* Section Styling */
section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    margin-bottom: var(--spacing-lg);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Problem Section */
.problem {
    background: var(--secondary-bg);
}

.problem-grid {
    display: grid;
    gap: var(--spacing-xl);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .problem-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.problem-card {
    background: var(--card-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 1px solid rgba(55, 65, 81, 0.5);
    transition: transform var(--transition-base);
}

.problem-card:hover {
    transform: translateY(-4px);
}

.problem-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.problem-card h3 {
    margin-bottom: var(--spacing-md);
}

/* Solution Section */
.solution-content {
    display: grid;
    gap: var(--spacing-3xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .solution-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-4xl);
    }
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.feature-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.feature-content h3 {
    margin-bottom: var(--spacing-sm);
}

/* App Preview */
.app-preview {
    display: flex;
    justify-content: center;
}

.app-screen {
    width: 280px;
    background: var(--secondary-bg);
    border-radius: 25px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    border: 3px solid rgba(55, 65, 81, 0.5);
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.status-icons {
    display: flex;
    gap: var(--spacing-xs);
}

.app-title {
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
}

.recovery-dashboard {
    background: rgba(55, 65, 81, 0.3);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
}

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

.score-ring {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: conic-gradient(var(--accent-primary) 0deg 313deg, rgba(55, 65, 81, 0.5) 313deg 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
    position: relative;
}

.score-ring::before {
    content: '';
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--secondary-bg);
    border-radius: 50%;
}

.score {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.score-status {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

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

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: rgba(55, 65, 81, 0.3);
    border-radius: var(--border-radius);
}

.metric-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.metric-trend {
    font-size: var(--font-size-sm);
}

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

.steps-grid {
    display: grid;
    gap: var(--spacing-xl);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.step-card {
    background: var(--primary-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    position: relative;
    border: 1px solid rgba(55, 65, 81, 0.5);
}

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

.step-card h3 {
    margin-bottom: var(--spacing-md);
}

/* Social Proof */
.testimonials-grid {
    display: grid;
    gap: var(--spacing-xl);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .testimonials-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.testimonial-card {
    background: var(--secondary-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(55, 65, 81, 0.5);
}

.testimonial-content {
    margin-bottom: var(--spacing-lg);
}

.testimonial-content p {
    font-style: italic;
    color: var(--text-secondary);
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-title {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* CTA Section */
.cta-section {
    background: var(--gradient-bg);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.cta-content {
    display: grid;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

@media (min-width: 1024px) {
    .cta-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-4xl);
    }
}

.cta-title {
    margin-bottom: var(--spacing-lg);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
}

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

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

.benefit-icon {
    color: var(--accent-primary);
}

/* Form Styling */
.signup-form {
    background: var(--secondary-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(55, 65, 81, 0.5);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.email-input {
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid rgba(55, 65, 81, 0.5);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    transition: border-color var(--transition-base);
}

.email-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

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

.error-message {
    color: #EF4444;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
    display: none;
}

.error-message.show {
    display: block;
}

.form-disclaimer {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--spacing-lg);
    margin-bottom: 0;
}

.success-message {
    background: var(--secondary-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 1px solid rgba(34, 211, 238, 0.3);
}

.success-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.success-message h3 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

/* Footer */
.footer {
    background: var(--secondary-bg);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid rgba(55, 65, 81, 0.3);
}

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

.footer-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-main {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: var(--spacing-sm) 0 0;
}

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

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

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

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(55, 65, 81, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.copyright, .disclaimer {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

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

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

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

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
    }
    50% {
        box-shadow: 0 0 30px rgba(34, 211, 238, 0.6);
    }
}

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

@keyframes chartBarGrow {
    from {
        height: 0;
    }
    to {
        height: var(--bar-height);
    }
}

@keyframes scoreCount {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes drawLine {
    from {
        stroke-dasharray: 1000;
        stroke-dashoffset: 1000;
    }
    to {
        stroke-dashoffset: 0;
    }
}

/* Enhanced Animations for New Elements */
.comparison-card.animate-in {
    animation: slideInFromBottom 0.8s ease-out;
}

.device-screen.synapse {
    animation: glow 3s ease-in-out infinite;
}

.meter-arc {
    animation: breathe 4s ease-in-out infinite;
}

.trend-svg path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 2s ease-out forwards;
}

.sleep-stages .stage {
    animation: chartBarGrow 0.8s ease-out;
    animation-delay: calc(var(--index, 0) * 0.1s);
}

.insight-score {
    animation: scoreCount 1s ease-out;
}

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Tooltips */
.tooltip {
    position: absolute;
    background: var(--secondary-bg);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(55, 65, 81, 0.5);
    z-index: 1000;
    opacity: 0;
    transform: translateX(-50%) translateY(-100%);
    transition: opacity var(--transition-base);
    pointer-events: none;
    white-space: nowrap;
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--secondary-bg);
}

.tooltip.show {
    opacity: 1;
}

/* Enhanced Focus Indicators */
.keyboard-navigation .tab-btn:focus,
.keyboard-navigation .btn:focus,
.keyboard-navigation .email-input:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Video Loading States */
.video-player.loading .demo-video {
    opacity: 0.5;
}

.video-player.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(34, 211, 238, 0.3);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 3;
}

/* Responsive Video Improvements */
@media (max-width: 768px) {
    .demo-video-container {
        margin-left: -var(--spacing-md);
        margin-right: -var(--spacing-md);
        border-radius: 0;
    }
    
    .video-player {
        border-radius: 0;
    }
}

/* Enhanced Hover States */
.feature-visual:hover .sleep-chart,
.feature-visual:hover .recovery-meter,
.feature-visual:hover .training-guide,
.feature-visual:hover .trends-chart {
    transform: scale(1.02);
    transition: transform var(--transition-base);
}

/* Advanced Animation Classes */
.animate-in {
    animation: fadeInUp 0.8s ease-out forwards;
}

.animate-in-left {
    animation: fadeInLeft 0.8s ease-out forwards;
}

.animate-in-right {
    animation: fadeInRight 0.8s ease-out forwards;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

/* Responsive Utilities */
@media (max-width: 767px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 768px) {
    .hide-desktop { display: none !important; }
}