/* ==========================================================================
   CSS Variables - Premium Dark Theme
   ========================================================================== */

:root {
    /* Colors - Enhanced Dark Theme */
    --primary-color: #6366f1;        /* Indigo - main CTA buttons */
    --primary-hover: #7c7ff5;        /* Lighter indigo for hover */
    --accent-color: #a855f7;         /* Purple accent for gradients */
    --accent-secondary: #ec4899;     /* Pink accent */
    --secondary-color: #374151;      /* Dark gray - secondary buttons */
    --text-primary: #f9fafb;         /* Almost white - headings */
    --text-secondary: #d1d5db;       /* Light gray - body text */
    --text-muted: #9ca3af;           /* Muted text */
    --background: #0f172a;           /* Rich dark background */
    --background-alt: #1e293b;       /* Slightly lighter dark */
    --background-elevated: #334155;  /* Elevated elements */
    --border-color: #334155;         /* Border color */
    --glow-color: rgba(99, 102, 241, 0.3); /* Primary glow */
    --glow-accent: rgba(168, 85, 247, 0.3); /* Accent glow */

    /* Spacing */
    --spacing-xs: 0.5rem;    /* 8px */
    --spacing-sm: 1rem;      /* 16px */
    --spacing-md: 2rem;      /* 32px */
    --spacing-lg: 3rem;      /* 48px */
    --spacing-xl: 5rem;      /* 80px */
    --spacing-2xl: 6rem;     /* 96px */

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    --line-height-tight: 1.2;

    /* Border Radius */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.75rem;    /* 12px */
    --radius-lg: 1.25rem;    /* 20px */
    --radius-xl: 1.5rem;     /* 24px */

    /* Shadows - Premium dark theme */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 40px -8px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px -5px var(--glow-color);
    --shadow-glow-accent: 0 0 30px -5px var(--glow-accent);

    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s ease;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-secondary);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 2rem;
    text-align: center;
    font-weight: 700;
}

h3 {
    font-size: 1.375rem;
    font-weight: 600;
}

/* Desktop typography */
@media (min-width: 768px) {
    h1 {
        font-size: 3.75rem;
        letter-spacing: -0.03em;
    }

    h2 {
        font-size: 2.75rem;
    }

    h3 {
        font-size: 1.5rem;
    }
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

@media (min-width: 768px) {
    .section-subtitle {
        font-size: 1.25rem;
    }
}

/* 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-width: 0;
}

/* ==========================================================================
   Buttons - Premium Gradient Style
   ========================================================================== */

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    box-shadow: 0 4px 15px -3px rgba(99, 102, 241, 0.4);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--accent-color) 100%);
    opacity: 0;
    transition: opacity var(--transition);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px -5px rgba(99, 102, 241, 0.6), var(--shadow-glow);
}

.btn-primary span,
.btn-primary {
    position: relative;
    z-index: 1;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--background-elevated);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px -3px rgba(99, 102, 241, 0.2);
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* CTA button group */
.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-md);
    }
}

/* ==========================================================================
   Hero Section - Premium Polish
   ========================================================================== */

.hero {
    padding: var(--spacing-2xl) 0 var(--spacing-xl) 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
    pointer-events: none;
    opacity: 0.3;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

@media (min-width: 768px) {
    .hero-subtitle {
        font-size: 1.375rem;
    }
}

.hero-image {
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    position: relative;
    transition: all var(--transition);
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: var(--radius-xl);
    padding: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.6;
    pointer-events: none;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   Demo Video Section
   ========================================================================== */

.demo-section {
    background-color: var(--background-alt);
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
}

.demo-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
}

.video-thumbnail {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
}

.video-thumbnail::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
    opacity: 0;
    transition: opacity var(--transition);
}

.video-thumbnail:hover::before {
    opacity: 1;
}

.video-thumbnail:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all var(--transition);
    filter: drop-shadow(0 4px 20px rgba(0, 0, 0, 0.5));
}

.video-thumbnail:hover .play-button {
    transform: translate(-50%, -50%) scale(1.15);
}

.play-button svg circle {
    transition: fill var(--transition);
}

.video-thumbnail:hover .play-button svg circle {
    fill: rgba(255, 255, 255, 1);
}

/* ==========================================================================
   Benefits Section - Premium Cards
   ========================================================================== */

.benefits {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.benefits::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
}

.benefits-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

@media (min-width: 640px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .benefits-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }
}

.benefit-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    background: var(--background-alt);
    text-align: center;
    transition: all var(--transition);
    position: relative;
    border: 1px solid var(--border-color);
}

.benefit-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
}

.benefit-card:hover::before {
    opacity: 0.8;
}

.benefit-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    background: linear-gradient(135deg, var(--background-alt) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 5rem;
    height: 5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 50%;
    transition: all var(--transition);
}

.benefit-card:hover .benefit-icon {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
    transform: scale(1.1);
}

.benefit-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.benefit-card p {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-muted);
}

/* ==========================================================================
   How It Works Section - Connected Steps
   ========================================================================== */

.how-it-works {
    background-color: var(--background-alt);
    padding: var(--spacing-xl) 0;
    position: relative;
}

.how-it-works::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
}

.steps {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    position: relative;
}

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

    /* Connecting line between steps */
    .steps::before {
        content: '';
        position: absolute;
        top: 3rem;
        left: 20%;
        right: 20%;
        height: 2px;
        background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
        opacity: 0.3;
        z-index: 0;
    }
}

.step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    transition: all var(--transition);
    border: 3px solid var(--background-alt);
}

.step:hover .step-number {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg), 0 0 40px -5px var(--glow-color);
}

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

.step p {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 300px;
    margin: 0 auto;
}

/* ==========================================================================
   Waitlist Section
   ========================================================================== */

.waitlist {
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
}

.waitlist::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
}

.waitlist::after {
    content: '';
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform: translate(-50%, 50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--glow-accent) 0%, transparent 70%);
    pointer-events: none;
    opacity: 0.2;
}

.waitlist h2 {
    position: relative;
    z-index: 1;
}

.waitlist .section-subtitle {
    position: relative;
    z-index: 1;
}

.waitlist .btn {
    position: relative;
    z-index: 1;
    margin-top: var(--spacing-md);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background-color: var(--background-alt);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    position: relative;
}

.footer p {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform var(--transition);
}

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

.footer-links a:hover::after {
    transform: scaleX(1);
}

/* ==========================================================================
   Video Modal
   ========================================================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 1000;
    padding: var(--spacing-sm);
    backdrop-filter: blur(10px);
}

.modal.open {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 1000px;
    animation: scaleIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: -3.5rem;
    right: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: white;
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal video {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

@media (min-width: 768px) {
    .modal {
        padding: var(--spacing-md);
    }
}