/* ===================================
   AI Contents Bank - Promotion Page
   Art Deco / Retro-Futuristic Design
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Rich, Luxurious Palette */
    --gold-primary: #d4af37;
    --gold-light: #f4d03f;
    --gold-dark: #b8860b;
    --cyan-accent: #00d4ff;
    --cyan-dark: #0099cc;
    --bg-void: #030508;
    --bg-deep: #0a0d14;
    --bg-surface: #12161f;
    --bg-elevated: #1a1f2e;
    --text-bright: #ffffff;
    --text-primary: #e8e6e1;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-subtle: rgba(212, 175, 55, 0.15);
    --border-glow: rgba(212, 175, 55, 0.4);

    /* Gradients */
    --gradient-gold: linear-gradient(135deg, #d4af37 0%, #f4d03f 50%, #d4af37 100%);
    --gradient-gold-dark: linear-gradient(135deg, #b8860b 0%, #d4af37 100%);
    --gradient-cyan: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
    --gradient-radial: radial-gradient(ellipse at center, rgba(212, 175, 55, 0.08) 0%, transparent 70%);

    /* Shadows */
    --shadow-gold: 0 0 60px rgba(212, 175, 55, 0.2);
    --shadow-cyan: 0 0 40px rgba(0, 212, 255, 0.15);
    --shadow-deep: 0 25px 80px rgba(0, 0, 0, 0.6);

    /* Typography */
    --font-display: 'Cinzel', serif;
    --font-body: 'LINE Seed JP', 'DM Sans', sans-serif;
    --font-jp: 'LINE Seed JP', sans-serif;

    /* Timing */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: 0.2s var(--ease-out-expo);
    --transition-medium: 0.4s var(--ease-out-expo);
    --transition-slow: 0.8s var(--ease-out-expo);
}

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

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

body {
    font-family: var(--font-body), var(--font-jp), sans-serif;
    background-color: var(--bg-void);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
    position: relative;
}

/* Grain Overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: 10000;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display), serif;
    font-weight: 400;
    line-height: 1.3;
    letter-spacing: 0.04em;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ===================================
   Geometric Decorations
   =================================== */
.geo-line {
    position: absolute;
    background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
    height: 1px;
    opacity: 0.3;
}

.geo-corner {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 1px solid var(--gold-primary);
    opacity: 0.2;
}

.geo-corner--tl { top: 0; left: 0; border-right: none; border-bottom: none; }
.geo-corner--tr { top: 0; right: 0; border-left: none; border-bottom: none; }
.geo-corner--bl { bottom: 0; left: 0; border-right: none; border-top: none; }
.geo-corner--br { bottom: 0; right: 0; border-left: none; border-top: none; }

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: linear-gradient(180deg, rgba(3, 5, 8, 0.95) 0%, rgba(3, 5, 8, 0.8) 100%);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition-medium);
}

.header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    position: relative;
}

.logo img {
    height: 44px;
    width: auto;
    filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.3));
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--gold-primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.header-cta {
    display: flex;
    gap: 16px;
    align-items: center;
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    filter: saturate(0.3) brightness(0.4);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% 50%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, rgba(3, 5, 8, 0.6) 0%, rgba(3, 5, 8, 0.4) 40%, rgba(3, 5, 8, 0.9) 100%);
    z-index: -1;
}

/* Hero Geometric Lines */
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    width: 1px;
    height: 40%;
    background: linear-gradient(180deg, transparent, var(--gold-primary), transparent);
    opacity: 0.2;
}

.hero::before {
    left: 10%;
    top: 20%;
}

.hero::after {
    right: 10%;
    bottom: 20%;
}

.hero-content {
    text-align: center;
    padding: 140px 32px 100px;
    max-width: 1000px;
    position: relative;
}

/* Decorative frame around hero content */
.hero-content::before {
    content: '';
    position: absolute;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background: var(--gradient-gold);
}

.hero-logo {
    width: 100px;
    height: auto;
    margin-bottom: 40px;
    animation: floatGlow 4s ease-in-out infinite;
    filter: drop-shadow(0 0 30px rgba(212, 175, 55, 0.4));
}

@keyframes floatGlow {
    0%, 100% {
        transform: translateY(0);
        filter: drop-shadow(0 0 30px rgba(212, 175, 55, 0.4));
    }
    50% {
        transform: translateY(-12px);
        filter: drop-shadow(0 0 50px rgba(212, 175, 55, 0.6));
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: 24px;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold-primary) 40%, var(--text-bright) 60%, var(--gold-primary) 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmerGold 8s ease-in-out infinite;
    text-shadow: none;
}

@keyframes shimmerGold {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-tagline {
    font-family: var(--font-display);
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--text-bright);
    margin-bottom: 48px;
    font-weight: 400;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    position: relative;
    display: inline-block;
    padding: 20px 48px;
}

.hero-tagline::before,
.hero-tagline::after {
    content: '◆';
    font-size: 0.5em;
    color: var(--gold-primary);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.hero-tagline::before {
    left: 0;
}

.hero-tagline::after {
    right: 0;
}

.hero-description-box {
    background: linear-gradient(135deg, rgba(18, 22, 31, 0.9) 0%, rgba(10, 13, 20, 0.95) 100%);
    border: 1px solid var(--border-subtle);
    border-radius: 0;
    padding: 36px 48px;
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
}

.hero-description-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--gold-primary), transparent);
}

.hero-description-box::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--gold-primary), transparent);
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 2;
    margin: 0;
    font-family: var(--font-jp);
}

.release-badge {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    background: transparent;
    border: 2px solid var(--gold-primary);
    color: var(--gold-primary);
    padding: 16px 40px;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 48px;
    position: relative;
    overflow: hidden;
}

.release-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.2), transparent);
    animation: badgeSweep 3s ease-in-out infinite;
}

@keyframes badgeSweep {
    0% { left: -100%; }
    50%, 100% { left: 100%; }
}

.release-badge-icon {
    font-size: 1.3rem;
}

.hero-buttons {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 40px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-gold);
    color: var(--bg-void);
    box-shadow: var(--shadow-gold);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: var(--transition-medium);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 80px rgba(212, 175, 55, 0.4);
}

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

.btn-secondary:hover {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--gold-primary);
    color: var(--gold-primary);
}

.btn-gold {
    background: var(--gradient-gold);
    color: var(--bg-void);
    box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 80px rgba(212, 175, 55, 0.4);
}

.btn-threads {
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

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

/* ===================================
   Sections
   =================================== */
section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
    position: relative;
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--gradient-gold);
}

.section-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--gold-primary);
    margin-bottom: 20px;
    position: relative;
    padding: 0 32px;
}

.section-label::before,
.section-label::after {
    content: '—';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gold-primary);
    opacity: 0.5;
}

.section-label::before { left: 0; }
.section-label::after { right: 0; }

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    margin-bottom: 20px;
    letter-spacing: 0.1em;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    font-family: var(--font-jp);
    line-height: 1.9;
}

/* ===================================
   Concept Section
   =================================== */
.concept {
    background: var(--bg-deep);
    position: relative;
}

.concept::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-radial);
    pointer-events: none;
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background: var(--border-subtle);
    position: relative;
}

.concept-card {
    background: var(--bg-deep);
    padding: 56px 40px;
    text-align: center;
    transition: var(--transition-medium);
    position: relative;
}

.concept-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--gold-primary);
    opacity: 0;
    transition: var(--transition-medium);
}

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

.concept-card:hover {
    background: var(--bg-surface);
}

.concept-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 28px;
    background: transparent;
    border: 1px solid var(--border-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: var(--transition-medium);
}

.concept-icon svg {
    width: 48px;
    height: 48px;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.concept-icon::before,
.concept-icon::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1px solid var(--gold-primary);
}

.concept-icon::before {
    top: -5px;
    left: -5px;
    border-right: none;
    border-bottom: none;
}

.concept-icon::after {
    bottom: -5px;
    right: -5px;
    border-left: none;
    border-top: none;
}

.concept-card:hover .concept-icon {
    background: rgba(212, 175, 55, 0.06);
    border-color: var(--gold-primary);
}

.concept-card:hover .concept-icon svg {
    transform: scale(1.08);
    filter: drop-shadow(0 0 8px rgba(212, 175, 55, 0.4));
}

.concept-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--text-bright);
    letter-spacing: 0.08em;
}

.concept-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-family: var(--font-jp);
    line-height: 1.9;
}

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

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

.features-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    margin-bottom: 0;
}

.feature-block {
    padding: 56px 48px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    position: relative;
    transition: var(--transition-medium);
}

.feature-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-cyan);
}

.feature-block::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--cyan-accent), transparent);
}

.feature-block:hover {
    border-color: var(--cyan-dark);
    box-shadow: var(--shadow-cyan);
}

.feature-block.gold::before {
    background: var(--gradient-gold);
}

.feature-block.gold::after {
    background: linear-gradient(180deg, var(--gold-primary), transparent);
}

.feature-block.gold:hover {
    border-color: var(--gold-dark);
    box-shadow: var(--shadow-gold);
}

.feature-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--cyan-accent);
    margin-bottom: 12px;
}

.feature-block.gold .feature-label {
    color: var(--gold-primary);
}

.feature-block h3 {
    font-size: 1.5rem;
    margin-bottom: 32px;
    letter-spacing: 0.05em;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-family: var(--font-jp);
}

.feature-list li:last-child {
    margin-bottom: 0;
}

.feature-list .icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    background: transparent;
    border: 1px solid var(--cyan-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan-accent);
    font-size: 0.7rem;
    margin-top: 2px;
}

.feature-block.gold .feature-list .icon {
    border-color: var(--gold-primary);
    color: var(--gold-primary);
}

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

.how-it-works::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    counter-reset: step;
    position: relative;
}

.steps::before {
    content: '';
    position: absolute;
    top: 80px;
    left: 16.67%;
    right: 16.67%;
    height: 1px;
    background: linear-gradient(90deg, var(--gold-primary), var(--gold-dark), var(--gold-primary));
    opacity: 0.3;
}

.step {
    position: relative;
    padding: 48px 40px;
    text-align: center;
    counter-increment: step;
}

.step::before {
    content: '0' counter(step);
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 400;
    color: var(--gold-primary);
    opacity: 0.15;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    line-height: 1;
}

.step::after {
    content: '';
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: var(--bg-deep);
    border: 2px solid var(--gold-primary);
    z-index: 1;
}

.step h4 {
    font-size: 1.125rem;
    margin-bottom: 16px;
    margin-top: 48px;
    letter-spacing: 0.08em;
}

.step p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-family: var(--font-jp);
    line-height: 1.8;
}

/* ===================================
   Vision Section
   =================================== */
.vision {
    background: var(--bg-void);
    position: relative;
    overflow: hidden;
}

.vision::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        linear-gradient(45deg, transparent 49.5%, var(--border-subtle) 49.5%, var(--border-subtle) 50.5%, transparent 50.5%),
        linear-gradient(-45deg, transparent 49.5%, var(--border-subtle) 49.5%, var(--border-subtle) 50.5%, transparent 50.5%);
    background-size: 60px 60px;
    opacity: 0.3;
    pointer-events: none;
}

.vision-content {
    position: relative;
    z-index: 1;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.vision-card {
    padding: 48px 36px;
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
    border: 1px solid var(--border-subtle);
    text-align: center;
    transition: var(--transition-medium);
    position: relative;
}

.vision-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: var(--gradient-gold);
    opacity: 0;
    z-index: -1;
    transition: var(--transition-medium);
}

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

.vision-card:hover {
    background: var(--bg-elevated);
    transform: translateY(-8px);
}

.vision-icon {
    margin-bottom: 24px;
    display: block;
}

.vision-icon svg {
    width: 3rem;
    height: 3rem;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.vision-card:hover .vision-icon svg {
    transform: scale(1.1);
    filter: drop-shadow(0 0 8px rgba(212, 175, 55, 0.4));
}

.vision-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    letter-spacing: 0.08em;
}

.vision-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-family: var(--font-jp);
    line-height: 1.8;
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    background: var(--bg-deep);
    text-align: center;
    padding: 140px 32px;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.cta::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
    opacity: 0.3;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.cta h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 24px;
    letter-spacing: 0.08em;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-size: 1rem;
    font-family: var(--font-jp);
    line-height: 1.9;
}

.cta-buttons {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.social-login {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.875rem;
    transition: var(--transition-medium);
    cursor: pointer;
}

.social-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--text-muted);
}

.social-btn svg {
    width: 20px;
    height: 20px;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-void);
    border-top: 1px solid var(--border-subtle);
    padding: 60px 0 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 1px;
    background: var(--gradient-gold);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 32px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-logo img {
    height: 36px;
    width: auto;
    filter: drop-shadow(0 0 10px rgba(212, 175, 55, 0.2));
}

.footer-logo span {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--gold-primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8125rem;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold-primary);
    transition: var(--transition-fast);
}

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

.footer-links a:hover::after {
    width: 100%;
}

.footer-bottom {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
}

/* ===================================
   Modal
   =================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(3, 5, 8, 0.9);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
    padding: 32px;
    overflow-y: auto;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-deep) 100%);
    border: 1px solid var(--border-subtle);
    padding: 56px 48px;
    max-width: 500px;
    width: 100%;
    text-align: center;
    position: relative;
    transform: scale(0.9) translateY(30px);
    transition: var(--transition-medium);
    box-shadow: var(--shadow-deep), var(--shadow-gold);
}

.modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-gold);
}

.modal::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--gradient-gold);
    opacity: 0.5;
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    line-height: 1;
}

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

.modal-icon {
    font-size: 4rem;
    margin-bottom: 28px;
}

.modal-title {
    font-size: 1.75rem;
    margin-bottom: 24px;
    color: var(--text-bright);
    line-height: 1.4;
    letter-spacing: 0.05em;
}

.modal-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.9;
    margin-bottom: 36px;
    font-family: var(--font-jp);
}

.modal-description strong {
    color: var(--gold-primary);
    font-weight: 500;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.modal-buttons .btn {
    width: 100%;
    justify-content: center;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.8s var(--ease-out-expo) forwards;
}

/* Staggered animations for cards */
.concept-card,
.vision-card,
.step {
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out-expo) forwards;
}

.concept-card:nth-child(1),
.vision-card:nth-child(1),
.step:nth-child(1) { animation-delay: 0.1s; }

.concept-card:nth-child(2),
.vision-card:nth-child(2),
.step:nth-child(2) { animation-delay: 0.2s; }

.concept-card:nth-child(3),
.vision-card:nth-child(3),
.step:nth-child(3) { animation-delay: 0.3s; }

/* ===================================
   Responsive
   =================================== */
@media (max-width: 1024px) {
    .container {
        padding: 0 24px;
    }

    section {
        padding: 80px 0;
    }

    .concept-grid,
    .vision-grid,
    .steps {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .steps::before {
        display: none;
    }

    .step::after {
        display: none;
    }

    .features-row {
        gap: 32px;
    }

    .feature-block {
        padding: 40px 32px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: 0 20px;
    }

    .header {
        padding: 16px 0;
    }

    .logo img {
        height: 36px;
    }

    .logo-text {
        font-size: 0.9rem;
        letter-spacing: 0.1em;
    }

    .header-cta .btn {
        padding: 12px 24px;
        font-size: 0.75rem;
    }

    .hero-content {
        padding: 120px 20px 80px;
    }

    .hero-logo {
        width: 70px;
        margin-bottom: 32px;
    }

    .hero-title {
        font-size: 2rem;
        letter-spacing: 0.15em;
    }

    .hero-tagline {
        font-size: 0.9rem;
        letter-spacing: 0.2em;
        padding: 16px 32px;
        margin-bottom: 36px;
    }

    .hero-description-box {
        padding: 28px 24px;
        clip-path: none;
    }

    .hero-description {
        font-size: 0.9375rem;
    }

    .release-badge {
        padding: 14px 28px;
        font-size: 0.8rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        padding: 14px 32px;
    }

    section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .section-label {
        font-size: 0.7rem;
        letter-spacing: 0.3em;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .section-subtitle {
        font-size: 0.9375rem;
    }

    .concept-grid,
    .vision-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        background: transparent;
    }

    .concept-card,
    .vision-card {
        padding: 36px 28px;
        border: 1px solid var(--border-subtle);
    }

    .concept-icon {
        width: 64px;
        height: 64px;
    }

    .concept-icon svg {
        width: 40px;
        height: 40px;
    }

    .features-row {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .feature-block {
        padding: 32px 24px;
    }

    .feature-block h3 {
        font-size: 1.25rem;
        margin-bottom: 24px;
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .step {
        padding: 32px 24px;
        text-align: left;
        border: 1px solid var(--border-subtle);
        background: var(--bg-surface);
    }

    .step::before {
        position: static;
        display: block;
        font-size: 2.5rem;
        margin-bottom: 16px;
        transform: none;
    }

    .step h4 {
        margin-top: 0;
    }

    .cta {
        padding: 80px 20px;
    }

    .cta h2 {
        font-size: 1.5rem;
    }

    .cta p {
        margin-bottom: 36px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
        margin-bottom: 36px;
    }

    .social-login {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }

    .social-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .footer {
        padding: 48px 0 32px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }

    .footer-bottom {
        margin-top: 32px;
        padding-top: 24px;
    }

    .modal-overlay {
        padding: 20px;
    }

    .modal {
        padding: 40px 28px;
    }

    .modal-title {
        font-size: 1.5rem;
    }

    .modal-icon {
        font-size: 3rem;
        margin-bottom: 20px;
    }

    .modal-description {
        font-size: 0.875rem;
        margin-bottom: 28px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .hero-content {
        padding: 100px 16px 60px;
    }

    .hero-logo {
        width: 60px;
    }

    .hero-title {
        font-size: 1.75rem;
        letter-spacing: 0.1em;
    }

    .hero-tagline {
        font-size: 0.8rem;
        padding: 12px 24px;
    }

    .hero-tagline::before,
    .hero-tagline::after {
        display: none;
    }

    .hero-description-box {
        padding: 24px 20px;
    }

    .release-badge {
        padding: 12px 24px;
        font-size: 0.75rem;
    }

    .section-title {
        font-size: 1.375rem;
    }

    .concept-card,
    .vision-card,
    .feature-block,
    .step {
        padding: 28px 20px;
    }

    .modal {
        padding: 32px 20px;
    }

    .modal-close {
        width: 36px;
        height: 36px;
        top: 12px;
        right: 12px;
    }
}

/* ===================================
   Utility Classes
   =================================== */
.text-gold {
    color: var(--gold-primary);
}

.text-cyan {
    color: var(--cyan-accent);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

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