/* ══════════════════════════════════════════════════════════
   AcuIT Landing Page — style.css
   Design: "Precision in the Dark" — Dark Premium × Gold Accent
   ══════════════════════════════════════════════════════════ */

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

/* ── Design Tokens ── */
:root {
  /* BACKGROUNDS */
  --bg-primary:       #08090E;
  --bg-secondary:     #0E1017;
  --bg-tertiary:      #15171F;
  --bg-elevated:      #1C1E28;

  /* ACCENT: GOLD */
  --accent-primary:   #C9A84C;
  --accent-light:     #E8D48B;
  --accent-dark:      #A07C2A;
  --accent-glow:      rgba(201, 168, 76, 0.15);
  --accent-subtle:    rgba(201, 168, 76, 0.08);

  --gradient-gold:    linear-gradient(180deg, #E8D48B, #A07C2A);
  --gradient-gold-h:  linear-gradient(90deg, #E8D48B, #C9A84C, #A07C2A);
  --gradient-gold-r:  radial-gradient(circle, #E8D48B, #C9A84C, #A07C2A);

  /* ACCENT: SECONDARY */
  --accent-secondary: #8B7355;

  /* TEXT */
  --text-primary:     #F0EDE6;
  --text-secondary:   #9B9484;
  --text-tertiary:    #6B6459;
  --text-accent:      #C9A84C;

  /* BORDER */
  --border-subtle:    rgba(201, 168, 76, 0.06);
  --border-default:   rgba(255, 255, 255, 0.08);
  --border-hover:     rgba(201, 168, 76, 0.30);

  /* GRADIENTS */
  --gradient-hero:    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(201, 168, 76, 0.06), transparent),
                      radial-gradient(ellipse 50% 40% at 80% 20%, rgba(160, 124, 42, 0.04), transparent);
  --gradient-card:    linear-gradient(180deg, rgba(201, 168, 76, 0.02) 0%, transparent 100%);

  /* TYPOGRAPHY */
  --font-display:  'DM Sans', sans-serif;
  --font-heading:  'DM Sans', sans-serif;
  --font-body:     'DM Sans', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;
  --font-ko:       'Pretendard', sans-serif;

  /* SPACING */
  --max-width:     1200px;
  --content-width: 1080px;
  --gutter:        24px;

  --space-1:   4px;
  --space-2:   8px;
  --space-3:   12px;
  --space-4:   16px;
  --space-5:   20px;
  --space-6:   24px;
  --space-8:   32px;
  --space-10:  40px;
  --space-12:  48px;
  --space-16:  64px;
  --space-20:  80px;
  --space-24:  96px;
  --space-32:  128px;
}

/* ── Global Styles ── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body), var(--font-ko), sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

[data-lang][hidden] {
  display: none !important;
}

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

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

/* ── Container ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── Section Label (shared) ── */
.section-label {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 16px;
}

/* ── Section Title ── */
.section-title {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.section-title-ko {
  font-family: var(--font-ko);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* ══════════════════════════════════════
   NAVIGATION
   ══════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background: rgba(8, 9, 14, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color 0.3s ease;
}

.navbar.scrolled {
  border-bottom-color: var(--border-default);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-left {
  display: flex;
  align-items: center;
  flex: 1;
}

.logo {
  display: flex;
  align-items: baseline;
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-display);
  cursor: pointer;
  letter-spacing: -0.02em;
}

.logo-acu {
  color: var(--text-primary);
}

.logo-it {
  background: linear-gradient(180deg, #E8D48B 0%, #C9A84C 40%, #A07C2A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  font-weight: 700;
}

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

.nav-link {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  flex: 1;
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  overflow: hidden;
}

.lang-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.lang-btn.active {
  color: var(--accent-primary);
  background: var(--accent-subtle);
}

/* Nav CTA */
.nav-cta {
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  background: transparent;
  cursor: pointer;
  font-family: var(--font-body);
}

.nav-cta:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 0 16px var(--accent-glow);
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 101;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(8, 9, 14, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

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

.mobile-menu .nav-link {
  font-size: 24px;
}

.mobile-menu .nav-link::after {
  bottom: -6px;
}

/* ══════════════════════════════════════
   HERO
   ══════════════════════════════════════ */
.hero {
  min-height: 100vh;
  background: var(--bg-primary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-top: 72px;
}

/* Animated aurora gradient — bold */
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 140%;
  height: 140%;
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, rgba(201, 168, 76, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 60% at 80% 20%, rgba(160, 124, 42, 0.14), transparent 60%),
    radial-gradient(ellipse 40% 40% at 50% 60%, rgba(232, 212, 139, 0.10), transparent 50%),
    radial-gradient(ellipse 30% 30% at 10% 80%, rgba(201, 168, 76, 0.08), transparent 50%),
    radial-gradient(ellipse 30% 30% at 90% 70%, rgba(160, 124, 42, 0.06), transparent 50%);
  animation: aurora 12s ease-in-out infinite alternate;
  pointer-events: none;
}

/* Grid pattern */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 168, 76, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 168, 76, 0.06) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
  pointer-events: none;
}

@keyframes aurora {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  50% {
    transform: translate(3%, -2%) scale(1.05);
    opacity: 0.8;
  }
  100% {
    transform: translate(-2%, 3%) scale(1.02);
    opacity: 1;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 var(--gutter);
}

/* Hero acuIT Logo */
.hero-logo {
  margin-bottom: 40px;
  font-family: var(--font-display);
  font-size: 80px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  animation: logo-glow 4s ease-in-out infinite alternate;
}

.hero-logo-acu {
  color: var(--text-primary);
}

.hero-logo-it {
  background: linear-gradient(180deg, #E8D48B 0%, #C9A84C 40%, #A07C2A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  font-weight: 700;
}

@keyframes logo-glow {
  0% { text-shadow: 0 0 20px rgba(201, 168, 76, 0.15); filter: drop-shadow(0 0 20px rgba(201, 168, 76, 0.15)); }
  100% { text-shadow: 0 0 40px rgba(201, 168, 76, 0.35); filter: drop-shadow(0 0 40px rgba(201, 168, 76, 0.35)); }
}

/* Side Decorations */
.side-decor {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  pointer-events: none;
  z-index: 2;
}

.side-decor-left {
  left: 4%;
  background: linear-gradient(180deg, transparent 5%, rgba(201, 168, 76, 0.12) 30%, rgba(201, 168, 76, 0.06) 50%, rgba(201, 168, 76, 0.12) 70%, transparent 95%);
}

.side-decor-right {
  right: 4%;
  background: linear-gradient(180deg, transparent 5%, rgba(201, 168, 76, 0.08) 25%, rgba(201, 168, 76, 0.12) 50%, rgba(201, 168, 76, 0.08) 75%, transparent 95%);
}

.side-decor::before,
.side-decor::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  left: -2.5px;
  background: var(--accent-primary);
  border-radius: 50%;
  box-shadow: 0 0 16px rgba(201, 168, 76, 0.5);
  animation: float-dot 6s ease-in-out infinite;
}

.side-decor::before { top: 25%; }
.side-decor::after { top: 65%; animation-delay: -3s; }
.side-decor-right::before { top: 40%; animation-delay: -1.5s; }
.side-decor-right::after { top: 80%; animation-delay: -4.5s; }

@keyframes float-dot {
  0%, 100% { transform: translateY(0); opacity: 0.3; }
  50% { transform: translateY(-30px); opacity: 0.9; }
}

/* Hero Typography */
.hero-title {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-title-ko {
  font-family: var(--font-ko);
  font-size: 52px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle-ko {
  font-family: var(--font-ko);
}

/* Hero CTAs */
.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-gold-h);
  color: #08090E;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 14px 28px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
  box-shadow: 0 0 24px rgba(201, 168, 76, 0.25),
              0 4px 12px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 14px 28px;
  border: 1px solid var(--border-default);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-light);
}

/* Tech Strip */
.tech-strip {
  display: flex;
  align-items: center;
  gap: 32px;
  justify-content: center;
  margin-top: 64px;
  flex-wrap: wrap;
}

.tech-strip .divider-text {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.tech-strip .tech-icon {
  height: 24px;
  opacity: 0.35;
  filter: grayscale(100%) brightness(2);
  transition: opacity 0.3s ease;
}

.tech-strip .tech-icon:hover {
  opacity: 0.7;
}

.tech-strip-item {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.tech-strip-item:hover {
  opacity: 0.8;
}

/* ── Glow divider between sections ── */
.hero + .about::before,
.product + .technology::before {
  content: '';
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, rgba(201, 168, 76, 0.5) 30%, rgba(232, 212, 139, 0.6) 50%, rgba(201, 168, 76, 0.5) 70%, transparent 95%);
  box-shadow: 0 0 30px rgba(201, 168, 76, 0.3), 0 0 60px rgba(201, 168, 76, 0.1);
}

/* ══════════════════════════════════════
   ABOUT
   ══════════════════════════════════════ */
.about {
  background: var(--bg-secondary);
  padding: 120px 0;
  position: relative;
}

/* Subtle noise texture */
.about::after,
.technology::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.about-grid {
  display: grid;
  grid-template-columns: 55% 45%;
  gap: 48px;
  align-items: center;
}

.about-text p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.about-text p:first-of-type {
  color: var(--text-primary);
}

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

/* Abstract geometric visual */
.about-visual-art {
  position: relative;
  width: 280px;
  height: 280px;
}

.about-visual-art .ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
}

.about-visual-art .ring-1 {
  inset: 0;
  border-color: rgba(201, 168, 76, 0.15);
  animation: rotate-slow 30s linear infinite;
}

.about-visual-art .ring-2 {
  inset: 30px;
  border-color: rgba(201, 168, 76, 0.1);
  animation: rotate-slow 25s linear infinite reverse;
}

.about-visual-art .ring-3 {
  inset: 60px;
  border-color: rgba(201, 168, 76, 0.2);
  animation: rotate-slow 20s linear infinite;
}

/* Orbiting dots */
.orbit {
  position: absolute;
  border-radius: 50%;
}

.orbit .dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 16px rgba(201, 168, 76, 0.5), 0 0 4px rgba(201, 168, 76, 0.8);
}

.orbit-1 {
  inset: 0;
  animation: rotate-slow 30s linear infinite;
}
.orbit-1 .dot { top: -4px; left: 50%; transform: translateX(-50%); }

.orbit-2 {
  inset: 30px;
  animation: rotate-slow 25s linear infinite reverse;
}
.orbit-2 .dot { top: 50%; right: -4px; transform: translateY(-50%); }

.orbit-3 {
  inset: 0;
  animation: rotate-slow 22s linear infinite reverse;
}
.orbit-3 .dot { bottom: -4px; left: 30%; transform: translateX(-50%); }

.orbit-4 {
  inset: 60px;
  animation: rotate-slow 18s linear infinite;
}
.orbit-4 .dot { top: 50%; left: -4px; transform: translateY(-50%); }

.about-visual-art .center-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.ct-acu {
  color: rgba(240, 237, 230, 0.1);
}

.ct-it {
  background: linear-gradient(180deg, rgba(232, 212, 139, 0.15), rgba(160, 124, 42, 0.15));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
}

@keyframes rotate-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ══════════════════════════════════════
   PRODUCT
   ══════════════════════════════════════ */
.product {
  background: var(--bg-primary);
  padding: 120px 0;
}

.product-card {
  position: relative;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 20px;
  padding: 56px;
  backdrop-filter: blur(20px);
  overflow: hidden;
  margin-top: 48px;
}

/* Animated shimmer on product card */
.product-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    from 0deg at 50% 50%,
    transparent 0deg,
    rgba(201, 168, 76, 0.08) 60deg,
    transparent 120deg,
    rgba(232, 212, 139, 0.06) 240deg,
    transparent 360deg
  );
  animation: shimmer-rotate 15s linear infinite;
  pointer-events: none;
}

@keyframes shimmer-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.product-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 20px;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(232, 212, 139, 0.3),
    rgba(201, 168, 76, 0.1),
    rgba(160, 124, 42, 0.2)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.product-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.product-logo-wrap {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.product-miin-logo {
  width: 120px;
  height: auto;
  filter: drop-shadow(0 0 20px rgba(201, 168, 76, 0.25));
}

.product-name-sub {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-secondary);
}

.product-desc {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 8px;
  max-width: 600px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.feature-mini {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition: border-color 0.3s ease;
}

.feature-mini:hover {
  border-color: var(--border-hover);
}

.feature-mini .icon {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--accent-primary);
}

.feature-mini .title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.feature-mini .desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.product-cta {
  margin-top: 32px;
}

/* ══════════════════════════════════════
   TECHNOLOGY
   ══════════════════════════════════════ */
.technology {
  background: var(--bg-secondary);
  padding: 120px 0;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.tech-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: 14px;
  padding: 32px;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.tech-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-3px);
}

.tech-card .card-icon {
  font-size: 20px;
  color: var(--accent-primary);
  margin-bottom: 16px;
}

.tech-card .tech-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.tech-card .tech-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ══════════════════════════════════════
   TEAM
   ══════════════════════════════════════ */
.team {
  background: var(--bg-primary);
  padding: 120px 0;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 48px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.team-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  transition: border-color 0.3s ease;
}

.team-card:hover {
  border-color: var(--border-hover);
}

.team-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  filter: grayscale(100%) brightness(0.85);
  transition: filter 0.5s ease;
  margin-bottom: 20px;
  background: var(--bg-elevated);
}

.team-card:hover .team-photo {
  filter: grayscale(0%) brightness(1);
}

/* Photo placeholder when no image */
.team-photo-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 36px;
  color: var(--accent-primary);
  opacity: 0.5;
  border: 1px solid var(--border-default);
}

.team-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.team-name-en {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.team-role {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-accent);
  margin-top: 8px;
}

.team-edu {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.4;
}

/* ══════════════════════════════════════
   MILESTONES
   ══════════════════════════════════════ */
.milestones {
  background: var(--bg-secondary);
  padding: 120px 0;
}

.timeline {
  position: relative;
  padding-left: 40px;
  margin-top: 48px;
  max-width: 600px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--accent-primary),
    var(--accent-dark),
    var(--border-default)
  );
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid var(--accent-light);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: translateX(-50%);
}

.timeline-marker.in-progress {
  background: linear-gradient(180deg, var(--accent-primary) 50%, transparent 50%);
  border: 2px solid var(--accent-primary);
}

.timeline-marker.planned {
  background: transparent;
  border: 2px solid var(--text-tertiary);
  box-shadow: none;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ══════════════════════════════════════
   PARTNERS / BACKED BY
   ══════════════════════════════════════ */
.partners {
  background: var(--bg-primary);
  padding: 80px 0;
}

.partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-top: 48px;
}

.partner-logo {
  height: 40px;
  opacity: 0.4;
  filter: grayscale(100%) brightness(2);
  transition: opacity 0.3s ease;
}

.partner-logo:hover {
  opacity: 0.8;
}

.partner-text {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.05em;
  opacity: 0.6;
  transition: opacity 0.3s ease;
}

.partner-text:hover {
  opacity: 1;
}

.colab-orange {
  color: #E8762B;
}

.colab-gray {
  color: #A0A0A0;
}

/* ══════════════════════════════════════
   CONTACT / CTA
   ══════════════════════════════════════ */
.contact {
  background: var(--bg-secondary);
  padding: 120px 0;
}

.cta-card {
  position: relative;
  background: var(--bg-tertiary);
  border-radius: 24px;
  padding: 72px 56px;
  text-align: center;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 24px;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(232, 212, 139, 0.4),
    rgba(201, 168, 76, 0.1),
    rgba(232, 212, 139, 0.25)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.cta-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 50%;
  background: radial-gradient(ellipse, rgba(201, 168, 76, 0.06), transparent 70%);
  pointer-events: none;
}

.cta-card > * {
  position: relative;
  z-index: 1;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.cta-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.cta-email {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-accent);
  letter-spacing: 0.03em;
  margin-top: 24px;
}

.cta-email a {
  color: var(--text-accent);
  transition: color 0.3s ease;
}

.cta-email a:hover {
  color: var(--accent-light);
}

/* ══════════════════════════════════════
   FOOTER
   ══════════════════════════════════════ */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-default);
  padding: 48px 0 32px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.3s ease;
}

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

.footer-divider {
  height: 1px;
  background: var(--border-default);
  margin-bottom: 24px;
}

.footer-info {
  margin-bottom: 0;
}

.footer-info p {
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

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

.footer-copyright {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  color: var(--text-tertiary);
  transition: color 0.3s ease;
}

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

.footer-social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ══════════════════════════════════════
   ANIMATIONS — Scroll Reveal
   ══════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger:nth-child(6) { transition-delay: 500ms; }

/* ══════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-visual {
    display: none;
  }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .hero-title {
    font-size: 48px;
  }

  .hero-title-ko {
    font-size: 40px;
  }

  .section-title {
    font-size: 34px;
  }

  .section-title-ko {
    font-size: 30px;
  }

  .about, .product, .technology, .team, .milestones, .contact {
    padding: 80px 0;
  }

  .product-card {
    padding: 40px;
  }

  .cta-card {
    padding: 56px 40px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .navbar {
    height: 60px;
  }

  .nav-center,
  .nav-right .nav-cta,
  .nav-right .lang-toggle {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .mobile-menu .lang-toggle,
  .mobile-menu .nav-cta {
    display: flex;
  }

  .hero {
    padding-top: 60px;
    text-align: left;
    align-items: flex-end;
    padding-bottom: 64px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-logo {
    font-size: 56px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-title-ko {
    font-size: 32px;
  }

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

  .tech-strip {
    justify-content: flex-start;
    gap: 20px;
  }

  .section-title {
    font-size: 28px;
  }

  .section-title-ko {
    font-size: 26px;
  }

  .about, .product, .technology, .team, .milestones, .contact {
    padding: 64px 0;
  }

  .product-card {
    padding: 32px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

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

  .team-grid {
    grid-template-columns: 1fr;
    max-width: 340px;
  }

  .cta-card {
    padding: 40px 24px;
  }

  .cta-title {
    font-size: 28px;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .badge-pill {
    font-size: 12px;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .hero-title {
    font-size: 30px;
  }

  .hero-title-ko {
    font-size: 28px;
  }

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

  .feature-mini {
    padding: 16px 12px;
  }

  .btn-primary,
  .btn-secondary {
    padding: 12px 22px;
    font-size: 14px;
    width: 100%;
    justify-content: center;
  }

  .hero-ctas {
    flex-direction: column;
  }
}