/* ==========================================================================
   2026 INCHEON CREATIVE DESIGN WEEK (ICDW 2026) - OFFICIAL PORTAL
   Domain: https://icdw.site
   Theme: Dual Theme (Deep Midnight Obsidian & Modern Radiant Light)
   Aesthetics: Glassmorphism, 3D Parallax, Vector Sheen Beams, Neon Glows
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design System & CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Default: Dark Mode */
  color-scheme: dark;

  /* Backgrounds */
  --bg-primary: #070a12;
  --bg-secondary: #0d1220;
  --bg-tertiary: #141c2e;
  --bg-card: rgba(18, 25, 43, 0.65);
  --bg-card-hover: rgba(25, 36, 62, 0.85);
  --bg-glass: rgba(10, 15, 28, 0.72);
  --bg-glass-nav: rgba(7, 10, 18, 0.82);

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(0, 210, 255, 0.16);
  --border-card-hover: rgba(0, 210, 255, 0.45);
  --border-glow: rgba(0, 229, 255, 0.6);

  /* Typography Colors */
  --text-pure: #ffffff;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8493a8;
  --text-dim: #54647a;

  /* Brand Accents (Incheon Marine Blue & Neon Coral & Cyber Cyan) */
  --accent-cyan: #00e5ff;
  --accent-blue: #2563eb;
  --accent-royal: #1d4ed8;
  --accent-orange: #ff9900;
  --accent-coral: #f43f5e;
  --accent-purple: #a855f7;

  /* Glows & Shadows */
  --glow-cyan: 0 0 25px rgba(0, 229, 255, 0.35);
  --glow-orange: 0 0 25px rgba(255, 153, 0, 0.35);
  --glow-card: 0 16px 36px -12px rgba(0, 0, 0, 0.7);
  --glow-crystal: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.95)) drop-shadow(0 0 24px rgba(0, 210, 255, 0.45));

  /* Gradients */
  --grad-cyan-blue: linear-gradient(135deg, #00f0ff 0%, #0066ff 100%);
  --grad-orange-coral: linear-gradient(135deg, #ffb703 0%, #f43f5e 100%);
  --grad-text-hero: linear-gradient(135deg, #ffffff 10%, #d8ebff 50%, #00e5ff 100%);
  --grad-card-border: linear-gradient(135deg, rgba(0, 229, 255, 0.5) 0%, rgba(37, 99, 235, 0.2) 50%, rgba(255, 153, 0, 0.4) 100%);

  /* Fonts */
  --font-main: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
  --font-display: 'Outfit', 'Pretendard', sans-serif;

  /* Dimensions */
  --header-height: 74px;
  --max-content-width: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   Light Mode Overrides
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  color-scheme: light;

  /* Backgrounds */
  --bg-primary: #f5f8fc;
  --bg-secondary: #eaf0f9;
  --bg-tertiary: #dfe7f4;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-nav: rgba(245, 248, 252, 0.88);

  /* Borders & Dividers */
  --border-subtle: rgba(0, 37, 148, 0.08);
  --border-card: rgba(0, 102, 255, 0.16);
  --border-card-hover: rgba(0, 102, 255, 0.42);
  --border-glow: rgba(0, 102, 255, 0.5);

  /* Typography Colors */
  --text-pure: #0a1128;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  /* Gradients */
  --grad-text-hero: linear-gradient(135deg, #09132c 20%, #004ecc 70%, #0088ff 100%);

  /* Glows */
  --glow-cyan: 0 8px 24px rgba(0, 102, 255, 0.15);
  --glow-orange: 0 8px 24px rgba(255, 153, 0, 0.2);
  --glow-card: 0 16px 36px -12px rgba(15, 23, 42, 0.08);
  --glow-crystal: drop-shadow(0 20px 40px rgba(0, 37, 148, 0.22)) drop-shadow(0 0 18px rgba(0, 102, 255, 0.28));
}

/* --------------------------------------------------------------------------
   2. Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

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

body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-primary);
  font-family: var(--font-main);
  color: var(--text-primary);
  line-height: 1.6;
  word-break: keep-all;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* --------------------------------------------------------------------------
   3. Navigation Bar (Sticky Glassmorphic)
   -------------------------------------------------------------------------- */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: var(--bg-glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal), box-shadow var(--transition-normal), height var(--transition-fast);
}

.main-header.scrolled {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.28);
  border-bottom-color: var(--border-card);
}

.header-container {
  max-width: var(--max-content-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Brand Identity */
.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-symbol {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #002594 0%, #00e5ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.35);
  position: relative;
  overflow: hidden;
}

.brand-symbol::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.4) 0%, transparent 60%);
}

.brand-texts {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-pure);
}

.brand-title .year-badge {
  background: var(--grad-cyan-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
}

.brand-subtitle {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: -0.01em;
}

/* Nav Menu Items */
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

[data-theme="light"] .nav-link:hover {
  color: var(--accent-blue);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-cyan-blue);
  border-radius: var(--radius-pill);
}

.nav-link-hub {
  color: var(--accent-orange) !important;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link-hub .hub-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #ff9900;
  box-shadow: 0 0 10px #ff9900;
  animation: pulseHub 2s infinite;
}

@keyframes pulseHub {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--glow-cyan);
}

[data-theme="dark"] .theme-toggle-btn .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle-btn .icon-sun { display: block; }
[data-theme="light"] .theme-toggle-btn .icon-sun { display: none; }
[data-theme="light"] .theme-toggle-btn .icon-moon { display: block; }

/* Primary CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--grad-cyan-blue);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 153, 255, 0.35);
  transition: all var(--transition-fast);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 153, 255, 0.55);
}

/* Mobile Nav Toggle */
.mobile-menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   4. Grand Interactive Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  min-height: 94vh;
  padding: calc(var(--header-height) + 40px) 24px 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Vector & Ambient Backdrop */
.hero-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

/* Hero Vector SVG Wrap - Strictly localized to hug the 3D keyvisual */
.hero-vector-svg-wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 580px;
  height: 580px;
  max-width: 95vw;
  opacity: 0.92;
  filter: drop-shadow(0 0 24px rgba(0, 229, 255, 0.3));
  pointer-events: none;
  z-index: 1;
}

[data-theme="light"] .hero-vector-svg-wrap {
  opacity: 0.55;
  filter: drop-shadow(0 0 16px rgba(0, 102, 255, 0.18));
}

.hero-ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  opacity: 0.4;
  animation: orbFloat 14s ease-in-out infinite alternate;
}

.orb-blue {
  top: 15%;
  right: 20%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, #0055ff 0%, rgba(0, 85, 255, 0) 70%);
}

.orb-coral {
  bottom: 15%;
  right: 10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, #f43f5e 0%, rgba(244, 63, 94, 0) 70%);
  animation-delay: -5s;
}

.orb-cyan {
  top: 45%;
  right: 15%;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, #00e5ff 0%, rgba(0, 229, 255, 0) 70%);
  animation-delay: -8s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -40px) scale(1.08); }
  100% { transform: translate(-30px, 30px) scale(0.95); }
}

/* Hero Content Grid (Left: Typography & CTAs, Right: 3D Crystal & Visual) */
.hero-container {
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
  position: relative;
  z-index: 5;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 50px;
}

/* Left Hero Texts - High readability without background line interference */
.hero-info-column {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}

/* Top Pill Badges - Vertical Stacking & Left Aligned (User Req 2) */
.hero-badges-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 4px;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  color: var(--text-primary);
}

.hero-pill-badge.accent-dday {
  background: linear-gradient(135deg, rgba(255, 153, 0, 0.18), rgba(244, 63, 94, 0.18));
  border-color: rgba(255, 153, 0, 0.45);
  color: var(--accent-orange);
}

.hero-pill-badge.accent-dday .dday-val {
  font-family: var(--font-display);
  font-weight: 900;
  color: #ff9900;
}

.hero-pill-badge.live-pulse {
  border-color: rgba(0, 229, 255, 0.35);
  color: var(--accent-cyan);
}

.hero-pill-badge.live-pulse .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.5; }
}

/* Main Hero Title */
.hero-title {
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-pure);
}

.hero-title .title-sub {
  display: block;
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.hero-title .title-highlight {
  background: var(--grad-text-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-title .title-accent {
  color: var(--accent-cyan);
  text-shadow: 0 0 30px rgba(0, 229, 255, 0.45);
}

[data-theme="light"] .hero-title .title-accent {
  color: var(--accent-blue);
  text-shadow: none;
}

/* Hero Description */
.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
}

/* Compact Info Cards Row */
.hero-key-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 10px;
  max-width: 580px;
}

.fact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.fact-item:hover {
  border-color: var(--border-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--glow-card);
}

.fact-icon-box {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(0, 210, 255, 0.12);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

[data-theme="light"] .fact-icon-box {
  background: rgba(0, 102, 255, 0.1);
  color: var(--accent-blue);
}

.fact-texts {
  display: flex;
  flex-direction: column;
}

.fact-label {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.fact-value {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-pure);
}

/* Hero CTA Button Group */
.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 14px;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  background: var(--grad-cyan-blue);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  box-shadow: 0 6px 24px rgba(0, 153, 255, 0.4);
  transition: all var(--transition-fast);
}

.btn-hero-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(0, 153, 255, 0.6);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
  backdrop-filter: blur(10px);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-hero-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-3px);
  box-shadow: var(--glow-cyan);
}

.btn-hero-video {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.btn-hero-video:hover {
  color: var(--accent-orange);
}

/* Right Hero Visual (3D Crystal LINK & Sheen Beam) */
.hero-visual-column {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
}

.crystal-interactive-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  transition: transform 0.2s cubic-bezier(0.1, 0.9, 0.2, 1);
}

.crystal-visual-container {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Pure Crystal Keyvisual Image */
.hero-crystal-img {
  width: 100%;
  max-width: 440px;
  height: auto;
  user-select: none;
  filter: var(--glow-crystal);
  animation: crystalFloat 6s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes crystalFloat {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(0.8deg); }
  100% { transform: translateY(6px) rotate(-0.5deg); }
}

/* Masked Sheen Beam (Sweeping Light on Crystal Facets) */
.crystal-sheen-mask {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  -webkit-mask-image: url('assets/images/keyvisual_pure.webp');
  mask-image: url('assets/images/keyvisual_pure.webp');
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  overflow: hidden;
  z-index: 2;
}

.sheen-light-beam {
  position: absolute;
  top: -60%;
  left: -80%;
  width: 65%;
  height: 240%;
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(255, 255, 255, 0) 30%,
    rgba(255, 255, 255, 0.5) 48%,
    rgba(0, 229, 255, 0.9) 52%,
    rgba(255, 255, 255, 0.7) 56%,
    transparent 75%
  );
  transform: rotate(25deg);
  animation: sweepSheen 5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  mix-blend-mode: screen;
}

@keyframes sweepSheen {
  0% { transform: translate(-80%, -40%) rotate(25deg); }
  35%, 100% { transform: translate(320%, 40%) rotate(25deg); }
}

/* Floating Info Hologram Chips around Crystal */
.hologram-chip {
  position: absolute;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-card);
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  z-index: 10;
  animation: floatChip 5s ease-in-out infinite alternate;
}

.chip-top-right {
  top: 15px;
  right: -10px;
  animation-delay: -1s;
}

.chip-bottom-left {
  bottom: 25px;
  left: -15px;
  animation-delay: -3.5s;
}

@keyframes floatChip {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

/* --------------------------------------------------------------------------
   5. Section Header Component (Shared across sections)
   -------------------------------------------------------------------------- */
.section-wrapper {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 100px 24px;
  position: relative;
  z-index: 5;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 210, 255, 0.1);
  border: 1px solid rgba(0, 210, 255, 0.3);
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

[data-theme="light"] .section-tag {
  background: rgba(0, 102, 255, 0.08);
  border-color: rgba(0, 102, 255, 0.25);
  color: var(--accent-blue);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-pure);
  line-height: 1.25;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   6. Event Digital Systems & Integrated Control Hub (Priority User Requirement)
   "앞으로 만드는 기능은 각각 버튼으로 링크해"
   -------------------------------------------------------------------------- */
.hub-section-bg {
  position: relative;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.hub-section-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.hub-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.hub-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-cyan-blue);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.hub-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-card-hover);
  box-shadow: var(--glow-card), var(--glow-cyan);
  background: var(--bg-card-hover);
}

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

.hub-card.card-featured {
  border-color: rgba(255, 153, 0, 0.4);
}

.hub-card.card-featured::before {
  background: var(--grad-orange-coral);
  opacity: 1;
}

.hub-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.hub-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.15), rgba(37, 99, 235, 0.2));
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 210, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.hub-card:hover .hub-icon-wrap {
  transform: scale(1.08) rotate(3deg);
  background: var(--grad-cyan-blue);
  color: #ffffff;
}

.hub-card.card-featured .hub-icon-wrap {
  background: linear-gradient(135deg, rgba(255, 153, 0, 0.2), rgba(244, 63, 94, 0.2));
  color: var(--accent-orange);
  border-color: rgba(255, 153, 0, 0.4);
}

.hub-card.card-featured:hover .hub-icon-wrap {
  background: var(--grad-orange-coral);
  color: #ffffff;
}

.hub-status-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(0, 229, 255, 0.08);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.2);
}

.hub-status-tag.active {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
  border-color: rgba(34, 197, 94, 0.3);
}

.hub-status-tag .status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.hub-card-body {
  margin-bottom: 24px;
}

.hub-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.hub-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.hub-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.hub-feature-chip {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--border-subtle);
  color: var(--text-muted);
}

/* Hub Action Button */
.hub-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-decoration: none;
}

[data-theme="light"] .hub-action-btn {
  background: rgba(0, 0, 0, 0.03);
}

.hub-action-btn:hover {
  background: var(--grad-cyan-blue);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(0, 153, 255, 0.35);
}

.hub-card.card-featured .hub-action-btn:hover {
  background: var(--grad-orange-coral);
  box-shadow: 0 4px 16px rgba(255, 153, 0, 0.35);
}

/* --------------------------------------------------------------------------
   7. Keynote Speakers Section
   -------------------------------------------------------------------------- */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.speaker-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  backdrop-filter: blur(14px);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.speaker-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-card), var(--glow-cyan);
}

.speaker-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1.05;
  overflow: hidden;
  background: linear-gradient(180deg, #10182c 0%, #080c16 100%);
}

.speaker-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-slow);
}

.speaker-card:hover .speaker-img {
  transform: scale(1.05);
}

.speaker-gradient-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(7, 10, 18, 0.95) 100%);
}

[data-theme="light"] .speaker-gradient-overlay {
  background: linear-gradient(180deg, transparent 40%, rgba(245, 248, 252, 0.95) 100%);
}

.speaker-badge-overlay {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 700;
  backdrop-filter: blur(8px);
}

.speaker-card-info {
  padding: 24px;
}

.speaker-name-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}

.speaker-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-pure);
}

.speaker-role {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

[data-theme="light"] .speaker-role {
  color: var(--accent-blue);
}

.speaker-topic {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.speaker-bio {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}

.btn-speaker-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-cyan);
  transition: gap var(--transition-fast);
}

[data-theme="light"] .btn-speaker-more {
  color: var(--accent-blue);
}

.speaker-card:hover .btn-speaker-more {
  gap: 10px;
}

/* --------------------------------------------------------------------------
   8. Program Schedule Timeline Section
   -------------------------------------------------------------------------- */
.program-tabs-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.tab-btn {
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn.active {
  background: var(--grad-cyan-blue);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(0, 153, 255, 0.4);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

/* Part 1 & Part 2 Session Divider Bar */
.session-divider-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-cyan);
  margin-bottom: 4px;
}

[data-theme="light"] .session-divider-bar {
  background: rgba(0, 102, 255, 0.05);
  border-left-color: var(--accent-blue);
}

.session-divider-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-pure);
}

.session-divider-badge .badge-accent {
  font-size: 0.76rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--accent-cyan);
  color: #0b0f19;
  letter-spacing: 0.02em;
}

[data-theme="light"] .session-divider-badge .badge-accent {
  background: var(--accent-blue);
  color: #ffffff;
}

.session-divider-time {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
}

.timeline-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-fast);
}

.timeline-card:hover {
  border-color: var(--border-card-hover);
  transform: translateX(6px);
  box-shadow: var(--glow-card);
}

.timeline-card.timeline-card-accent {
  border-color: rgba(0, 229, 255, 0.3);
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.04) 0%, var(--bg-card) 100%);
}

.timeline-card.timeline-card-highlight {
  border-color: rgba(255, 153, 0, 0.45);
  background: linear-gradient(90deg, rgba(255, 153, 0, 0.06) 0%, var(--bg-card) 100%);
  box-shadow: 0 4px 20px rgba(255, 153, 0, 0.08);
}

.timeline-card.timeline-card-highlight:hover {
  border-color: var(--accent-orange);
  box-shadow: 0 8px 28px rgba(255, 153, 0, 0.22);
}

.time-type-tag.tag-keynote {
  color: var(--accent-orange);
  font-weight: 700;
}

.timeline-time-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.time-badge {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

[data-theme="light"] .time-badge {
  color: var(--accent-blue);
}

.time-type-tag {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-muted);
}

.timeline-content-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 20px;
  border-left: 1px solid var(--border-subtle);
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-pure);
  line-height: 1.45;
}

.timeline-speaker-info {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-orange);
}

.timeline-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   9. Exhibition & Interactive Floor Plan
   -------------------------------------------------------------------------- */
.exhibition-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.floorplan-viewer-box {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  box-shadow: var(--glow-card);
  cursor: pointer;
}

.floorplan-img {
  width: 100%;
  height: auto;
  transition: transform var(--transition-normal);
}

.floorplan-viewer-box:hover .floorplan-img {
  transform: scale(1.03);
}

.floorplan-overlay-tip {
  position: absolute;
  bottom: 16px;
  right: 16px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.7);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 600;
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 6px;
}

.exhibition-zones-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.zone-item {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.zone-item:hover {
  border-color: var(--border-card-hover);
  background: var(--bg-card-hover);
}

.zone-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.zone-tag {
  font-size: 0.74rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--grad-cyan-blue);
  color: #ffffff;
}

.zone-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-pure);
}

.zone-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   10. Venue & Location Section
   -------------------------------------------------------------------------- */
.venue-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(14px);
}

.venue-info-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.venue-headline {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-pure);
}

.venue-address {
  font-size: 1.05rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.transit-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.transit-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(0, 210, 255, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

[data-theme="light"] .transit-icon {
  background: rgba(0, 102, 255, 0.1);
  color: var(--accent-blue);
}

.transit-text h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-pure);
}

.transit-text p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.venue-actions-row {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

.btn-map {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 700;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  transition: all var(--transition-fast);
}

.btn-map:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.venue-visual-side {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  position: relative;
  min-height: 280px;
  background: url('assets/images/poster.webp') center/cover no-repeat;
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.main-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 24px 30px;
}

.footer-inner {
  max-width: var(--max-content-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.footer-top-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 30px;
}

.footer-orgs-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-orgs-col .org-item {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-orgs-col .org-item strong {
  color: var(--text-primary);
  margin-right: 6px;
}

.footer-bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   12. Modals (RSVP, Speaker Bio, Video Lightbox, Floor Plan Zoom)
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  max-width: 540px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 36px 32px;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
  transform: scale(0.94);
  transition: transform var(--transition-fast);
}

.modal-backdrop.open .modal-window {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--accent-coral);
  color: #ffffff;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Form Controls */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-input, .form-select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-pure);
  font-size: 0.92rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
}

.form-checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.btn-modal-submit {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-pill);
  background: var(--grad-cyan-blue);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-top: 20px;
  box-shadow: 0 4px 18px rgba(0, 153, 255, 0.4);
  transition: all var(--transition-fast);
}

.btn-modal-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 153, 255, 0.6);
}

/* --------------------------------------------------------------------------
   13. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-info-column {
    align-items: center;
  }

  .hero-description, .hero-key-facts {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hub-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .speakers-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .venue-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

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

  .hero-title {
    font-size: 2.3rem;
  }

  .hero-key-facts {
    grid-template-columns: 1fr;
  }

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

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

  .timeline-card {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .timeline-content-col {
    padding-left: 0;
    border-left: none;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
  }

  .section-title {
    font-size: 1.8rem;
  }
}