:root {
      --primary: #0a1628;
      --accent: #1a6fe8;
      --accent2: #00c8ff;
      --text: #e8edf5;
      --muted: #7a8ba8;
      --surface: #0f2040;
      --border: rgba(26,111,232,0.25);
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    img { -webkit-user-drag: none; user-drag: none; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Pretendard', sans-serif;
      background: var(--primary);
      color: var(--text);
      line-height: 1.7;
      overflow-x: hidden;
    }

    /* ─── NAV ─── */
    nav {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 999;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 max(5%, calc((100% - 1400px) / 2));
      height: 68px;
      background: rgba(10,22,40,0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border);
      transition: background .3s, transform .3s;
    }
    nav.nav-hidden { transform: translateY(-100%); }
    .nav-logo img {
      height: 36px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      list-style: none;
    }
    .nav-links a {
      color: var(--muted);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-links a:hover { color: var(--accent2); }
    .nav-links a.active {
      color: #d6eeff;
      text-shadow: 0 0 8px rgba(140,210,255,1.0), 0 0 20px rgba(80,170,255,0.7);
    }
    .nav-right { margin-left: 1rem; display: inline-flex; align-items: center; gap: 1rem; }
    .lang-slider {
      position: relative;
      display: inline-flex;
      background: rgba(30,143,255,0.12);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 2px;
    }
    .lang-slide-option {
      position: relative; z-index: 1;
      border: none; background: transparent; color: #7A90B8;
      font-size: 0.78rem; font-weight: 700; letter-spacing: 0.04em;
      padding: 5px 12px; border-radius: 6px; cursor: pointer;
      transition: color 0.25s; white-space: nowrap;
    }
    .lang-slide-option.active { color: #fff; }
    .lang-slide-thumb {
      position: absolute; top: 2px; left: 2px;
      height: calc(100% - 4px);
      border-radius: 6px;
      background: linear-gradient(135deg, #1E8FFF 0%, #0044CC 100%);
      transition: left 0.25s ease, width 0.25s ease;
      pointer-events: none;
    }
    .mobile-only { display: none; }
    .nav-lang-item { padding-top: 8px; }

    /* ─── HERO ─── */
    #hero {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding: 120px max(5%, calc((100% - 1400px) / 2)) 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-left {
      display: contents;
    }
    @keyframes hero-float {
      0%   { transform: translateY(-20%); }
      50%  { transform: translateY(-23%); }
      100% { transform: translateY(-20%); }
    }
    @keyframes hero-shimmer {
      0%   { filter: brightness(1); }
      40%  { filter: brightness(1.3); }
      60%  { filter: brightness(1.3); }
      100% { filter: brightness(1); }
    }
    @keyframes hero-fade {
      0%   { opacity: 0.18; }
      40%  { opacity: 0.04; }
      65%  { opacity: 0.24; }
      100% { opacity: 0.18; }
    }
    .hero-right-img {
      position: absolute;
      right: max(2%, calc((100% - 1400px) / 2));
      top: 50%;
      transform: translateY(-20%);
      pointer-events: none;
      z-index: 0;
      animation: hero-float 6s ease-in-out infinite;
    }
    .hero-right-img img {
      width: 720px;
      max-width: 50vw;
      height: auto;
      opacity: 0.18;
      animation: hero-shimmer 6s ease-in-out infinite, hero-fade 5s ease-in-out infinite;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(26,111,232,0.18) 0%, transparent 70%),
                  radial-gradient(ellipse 40% 40% at 80% 70%, rgba(0,200,255,0.10) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-logo {
      margin-bottom: 0.6rem;
      position: relative;
      z-index: 1;
    }
    .hero-logo img {
      height: 56px;
      width: auto;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(26,111,232,0.15);
      border: 1px solid rgba(26,111,232,0.4);
      color: var(--accent2);
      font-size: 0.78rem;
      font-weight: 600;
      letter-spacing: 0.12em;
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 1.8rem;
      text-transform: uppercase;
      position: relative;
      z-index: 1;
    }
    #hero h1 {
      font-size: clamp(2.6rem, 6vw, 5rem);
      font-weight: 800;
      line-height: 1.45;
      max-width: 750px;
      margin-bottom: 1.4rem;
      letter-spacing: -0.02em;
      position: relative;
      z-index: 1;
    }
    #hero h1 .blue { color: var(--accent2); }
    #hero > p {
      font-size: 1.15rem;
      color: var(--muted);
      max-width: 560px;
      margin-bottom: 2.6rem;
      position: relative;
      z-index: 1;
    }
    .hero-cta {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      position: relative;
      z-index: 1;
      margin-top: 2.5rem;
    }
    .btn-primary {
      padding: 14px 32px;
      background: var(--accent);
      color: #fff;
      border: none;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 700;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.2s, transform 0.15s;
    }
    .btn-primary:hover { background: #1460cc; transform: translateY(-2px); }
    .btn-outline {
      padding: 14px 32px;
      background: transparent;
      color: var(--text);
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      text-decoration: none;
      transition: border-color 0.2s, color 0.2s, transform 0.15s;
    }
    .btn-outline:hover { border-color: var(--accent2); color: var(--accent2); transform: translateY(-2px); }
    .hero-stats {
      display: flex;
      gap: 3.5rem;
      margin-top: 5rem;
      position: relative;
      z-index: 1;
    }
    .hero-stat .num {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--accent2);
      line-height: 1;
    }
    .hero-stat .label {
      font-size: 0.82rem;
      color: var(--muted);
      margin-top: 4px;
    }

    /* ─── SECTION COMMON ─── */
    section { padding: 100px max(5%, calc((100% - 1400px) / 2)); }
    .section-label {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--accent2);
      margin-bottom: 0.8rem;
    }
    .section-title {
      font-size: clamp(1.8rem, 3.5vw, 2.8rem);
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.01em;
      margin-bottom: 1rem;
    }
    .section-desc {
      color: var(--muted);
      font-size: 1rem;
      max-width: 1000px;
      margin-bottom: 3.5rem;
    }

    /* ─── ABOUT ─── */
    #about { background: var(--surface); }
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: start;
    }
    .company-info-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 1.5rem;
    }
    .company-info-table tr { border-bottom: 1px solid var(--border); }
    .company-info-table td { padding: 12px 4px; font-size: 0.92rem; }
    .company-info-table td:first-child { color: var(--muted); width: 120px; font-weight: 600; }
    .vision-cards { display: flex; flex-direction: column; gap: 1.2rem; margin-top: 1.5rem; }
    .vision-card {
      background: rgba(26,111,232,0.08);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.2rem 1.4rem;
    }
    .vision-card h4 { font-size: 0.95rem; font-weight: 700; color: var(--accent2); margin-bottom: 0.4rem; }
    .vision-card p { font-size: 0.88rem; color: var(--muted); }

    /* ─── PARTNERS ─── */
    #partners { background: var(--primary); }
    .partners-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
      gap: 1.2rem;
    }
    .partner-card {
      background: #d0d8e4;
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.2rem 1rem 0.8rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.7rem;
      height: 110px;
      transition: border-color 0.2s, transform 0.2s;
      overflow: hidden;
    }
    .partner-card:hover { border-color: var(--accent2); transform: translateY(-3px); }
    .partner-card img {
      width: 100%;
      height: 36px;
      object-fit: contain;
      mix-blend-mode: multiply;
      filter: grayscale(40%);
      transition: filter 0.2s;
    }
    .partner-card img.logo-kakaopay {
      width: 80%;
      height: 28.8px;
      margin: 0 auto;
    }
    .partner-card img.logo-koscom {
      width: 80%;
      height: 28.8px;
      margin: 0 auto;
    }
    .partner-card img.logo-hanasec {
      width: 85%;
      height: 30.6px;
      margin: 0 auto;
    }
    .partner-card img.logo-shinyoung {
      width: 95%;
      height: 34.2px;
      margin: 0 auto;
    }
    .partner-card:hover img { filter: grayscale(0%); }
    .partner-card span {
      width: 100%;
      margin-top: auto;
      font-size: 1.03rem;
      color: #3a4a5e;
      text-align: center;
      line-height: 1.3;
    }

    /* ─── HISTORY ─── */
    #history { background: var(--primary); }
    .alt-timeline {
      position: relative;
      max-width: 860px;
      margin: 0 auto;
    }
    .alt-timeline::before {
      content: '';
      position: absolute;
      left: 50%; top: 0; bottom: 0;
      width: 2px;
      transform: translateX(-50%);
      background: linear-gradient(to bottom, var(--accent), var(--accent2));
      border-radius: 1px;
    }
    /* traveling dot */
    .timeline-traveler {
      position: absolute;
      left: 50%;
      top: 0;
      transform: translateX(-50%);
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 2;
      overflow: hidden;
    }
    .timeline-traveler::before,
    .timeline-traveler::after {
      content: '';
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      border-radius: 50%;
    }
    /* main dot */
    .timeline-traveler::before {
      width: 10px; height: 10px;
      background: var(--accent2);
      box-shadow: 0 0 6px 2px var(--accent2), 0 0 16px 4px rgba(0,200,255,0.5);
      animation: travel-dot 5.85s ease-in-out infinite;
    }
    /* trailing glow */
    .timeline-traveler::after {
      width: 18px; height: 18px;
      background: rgba(0,200,255,0.15);
      box-shadow: 0 0 20px 8px rgba(0,200,255,0.2);
      animation: travel-dot 5.85s ease-in-out infinite;
      animation-delay: 0.09s;
    }
    @keyframes travel-dot {
      0%   { top: -10px; opacity: 0; }
      5%   { opacity: 1; }
      90%  { opacity: 0.8; }
      100% { top: calc(100% + 10px); opacity: 0; }
    }
    /* card flash when dot passes — each delay = dot's arrival time at that card */
    @keyframes card-flash {
      0%   { border-color: var(--accent2); background: rgba(0,200,255,0.1); box-shadow: 0 0 18px rgba(0,200,255,0.35), 0 0 40px rgba(26,111,232,0.15); }
      27%  { border-color: rgba(26,111,232,0.2); background: rgba(26,111,232,0.06); box-shadow: none; }
      100% { border-color: rgba(26,111,232,0.2); background: rgba(26,111,232,0.06); box-shadow: none; }
    }
    /* 5 cards at ~8%, 28%, 48%, 68%, 88% of 5.85s */
    .alt-timeline > div:nth-child(2) .alt-content { animation: card-flash 5.85s ease-out infinite; animation-delay: 0.47s; }
    .alt-timeline > div:nth-child(3) .alt-content { animation: card-flash 5.85s ease-out infinite; animation-delay: 1.64s; }
    .alt-timeline > div:nth-child(4) .alt-content { animation: card-flash 5.85s ease-out infinite; animation-delay: 2.81s; }
    .alt-timeline > div:nth-child(5) .alt-content { animation: card-flash 5.85s ease-out infinite; animation-delay: 3.98s; }
    .alt-timeline > div:nth-child(6) .alt-content { animation: card-flash 5.85s ease-out infinite; animation-delay: 5.15s; }
    .alt-item {
      position: relative;
      width: calc(50% - 2.2rem);
      margin-bottom: 2rem;
    }
    .alt-item.right {
      margin-left: calc(50% + 2.2rem);
    }
    .alt-item.left {
      margin-left: 0;
    }
    /* center dot */
    .alt-item::before {
      content: '';
      position: absolute;
      top: 1.1rem;
      width: 12px; height: 12px;
      border-radius: 50%;
      background: var(--accent2);
      border: 2px solid var(--primary);
      box-shadow: 0 0 6px var(--accent2);
      z-index: 1;
    }
    .alt-item.right::before { left: -2.6rem; }
    .alt-item.left::before  { right: -2.6rem; }
    /* connector line to dot */
    .alt-item::after {
      content: '';
      position: absolute;
      top: calc(1.1rem + 5px);
      height: 2px;
      width: 1.6rem;
      background: linear-gradient(to right, var(--accent), var(--accent2));
    }
    .alt-item.right::after { left: -2rem; }
    .alt-item.left::after  { right: -2rem; background: linear-gradient(to left, var(--accent), var(--accent2)); }
    /* glass card */
    .alt-content {
      background: rgba(26, 111, 232, 0.06);
      border: 1px solid rgba(26, 111, 232, 0.2);
      border-radius: 12px;
      padding: 1.4rem 1.6rem;
      cursor: default;
      transition: border-color 0.3s, background 0.3s;
    }
    .alt-content:hover {
      background: rgba(0, 200, 255, 0.08);
      border-color: var(--accent2);
      animation: sparkle-glow 1.4s ease-in-out infinite;
    }
    @keyframes sparkle-glow {
      0%, 100% {
        box-shadow: 0 0 8px rgba(0,200,255,0.25), 0 0 20px rgba(26,111,232,0.15);
      }
      50% {
        box-shadow: 0 0 18px rgba(0,200,255,0.55), 0 0 40px rgba(26,111,232,0.3), 0 0 60px rgba(0,200,255,0.1);
      }
    }
    .timeline-year { font-size: 0.78rem; font-weight: 700; color: var(--accent2); letter-spacing: 0.12em; margin-bottom: 0.3rem; }
    .timeline-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
    .timeline-list { list-style: none; display: flex; flex-direction: column; gap: 0.25rem; }
    .timeline-list li { font-size: 0.85rem; color: var(--muted); }
    .timeline-list li::before { content: '·  '; color: var(--accent); }

    /* ─── COMPETENCY ─── */
    #competency { background: var(--surface); }
    .comp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
    .comp-card {
      background: rgba(10,22,40,0.6);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 2rem;
      transition: border-color 0.2s, transform 0.2s;
    }
    .comp-card:hover { border-color: var(--accent2); transform: translateY(-4px); }
    .comp-icon {
      width: 44px; height: 44px; border-radius: 10px;
      background: rgba(26,111,232,0.2);
      display: flex; align-items: center; justify-content: center;
      font-size: 1.3rem; margin-bottom: 1rem;
    }
    .comp-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.8rem; }
    .comp-card ul { list-style: none; display: flex; flex-direction: column; gap: 0.35rem; }
    .comp-card ul li { font-size: 0.85rem; color: var(--muted); }
    .comp-card ul li::before { content: '→ '; color: var(--accent); }

    /* ─── SOLUTIONS ─── */
    #solutions { background: var(--primary); }
    .sol-tabs {
      display: flex;
      gap: 0.5rem;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }
    .sol-tab {
      padding: 9px 22px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: transparent;
      color: var(--muted);
      font-size: 0.88rem;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, color 0.2s, border-color 0.2s;
    }
    .sol-tab:hover { border-color: var(--accent2); color: var(--accent2); }
    .sol-tab.active {
      background: var(--accent);
      border-color: var(--accent);
      color: #fff;
    }
    .sol-tab[data-filter="infra"].active {
      background: #7c3aed;
      border-color: #7c3aed;
      color: #fff;
    }
    .sol-tab[data-filter="platform"].active {
      background: #059669;
      border-color: #059669;
      color: #fff;
    }
    @keyframes infra-twinkle {
      0%   { box-shadow: none; opacity: 1; }
      50%  { box-shadow: 0 0 8px 2px rgba(167,139,250,0.7), 0 0 18px 4px rgba(139,92,246,0.4); opacity: 0.6; }
      100% { box-shadow: none; opacity: 1; }
    }
    .sol-group-tag.infra.twinkling {
      animation: infra-twinkle 1.8s ease-in-out infinite;
    }
    @keyframes platform-twinkle {
      0%   { box-shadow: none; opacity: 1; }
      50%  { box-shadow: 0 0 8px 2px rgba(52,211,153,0.7), 0 0 18px 4px rgba(5,150,105,0.4); opacity: 0.6; }
      100% { box-shadow: none; opacity: 1; }
    }
    .sol-group-tag.platform.twinkling {
      animation: platform-twinkle 1.8s ease-in-out infinite;
    }
    .solutions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 2rem; }
    .sol-card.hidden { display: none; }
    .sol-card {
      border: 1px solid var(--border);
      border-radius: 16px;
      background: var(--surface);
      position: relative;
      overflow: hidden;
      transition: border-color 0.2s, transform 0.2s;
      display: flex;
      flex-direction: column;
    }
    .sol-card:hover { border-color: var(--accent2); transform: translateY(-5px); }
    .sol-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--accent), var(--accent2));
    }
    .sol-card-body { padding: 2rem 2rem 1.4rem; flex: 1; }
    .sol-tag-row {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 0.8rem;
      flex-wrap: wrap;
    }
    .sol-tag {
      display: inline-block;
      font-size: 0.72rem; font-weight: 700;
      letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--accent2);
      background: rgba(0,200,255,0.1);
      padding: 3px 10px; border-radius: 999px;
    }
    .sol-group-tag {
      display: inline-block;
      font-size: 0.72rem; font-weight: 700;
      letter-spacing: 0.08em;
      padding: 3px 10px; border-radius: 999px;
    }
    .sol-group-tag.infra {
      color: #a78bfa;
      background: rgba(139,92,246,0.12);
    }
    .sol-group-tag.platform {
      color: #34d399;
      background: rgba(52,211,153,0.12);
    }
    .sol-card h3 { font-size: 1.1rem; font-weight: 800; margin-bottom: 0.6rem; line-height: 1.3; }
    .sol-card h3 .sol-product-name {
      display: block;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--accent2);
      letter-spacing: 0.05em;
      margin-top: 0.25rem;
      margin-bottom: 1.4rem;
    }
    .sol-card p { font-size: 0.87rem; color: var(--muted); margin-bottom: 1.2rem; }
    .sol-features { display: flex; flex-direction: column; gap: 0.3rem; }
    .sol-features li { list-style: none; font-size: 0.83rem; color: var(--muted); }
    .sol-features li::before { content: '✓  '; color: var(--accent2); font-weight: 700; }
    /* Diagram image in solution card */
    .sol-diagram {
      margin-top: auto;
      border-top: 1px solid var(--border);
      overflow: hidden;
      cursor: zoom-in;
      background: var(--surface);
      height: 252px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .sol-diagram img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
      transition: transform 0.3s;
    }
    .sol-diagram:hover img { transform: scale(1.03); }

    /* ─── TECH STACK ─── */
    #tech { background: var(--surface); }
    .tech-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1rem;
      position: relative;
      margin-top: 1rem;
    }
    .tech-steps::before {
      content: '';
      position: absolute;
      top: 72px; left: 12.5%; right: 12.5%;
      height: 2px;
      background: linear-gradient(90deg, #1a6fe8, #8b5cf6, #00c8aa, #f59e0b);
      z-index: 0;
    }
    /* per-card color tokens */
    .tech-step:nth-child(1) { --sc: #1a6fe8; --sc2: #00c8ff; }
    .tech-step:nth-child(2) { --sc: #8b5cf6; --sc2: #c084fc; }
    .tech-step:nth-child(3) { --sc: #00c8aa; --sc2: #34d399; }
    .tech-step:nth-child(4) { --sc: #f59e0b; --sc2: #fbbf24; }
    .tech-step {
      display: flex; flex-direction: column; align-items: center;
      padding: 3rem 1rem 0;
      text-align: center;
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(255,255,255,0.07);
      border-radius: 14px;
      cursor: default;
      transition: border-color 0.3s, background 0.3s;
      position: relative;
      overflow: hidden;
      min-height: 380px;
    }
    .tech-step:nth-child(1):hover { border-color: #1a6fe8; animation: pulse-blue 1.4s ease-in-out infinite; }
    .tech-step:nth-child(2):hover { border-color: #8b5cf6; animation: pulse-purple 1.4s ease-in-out infinite; }
    .tech-step:nth-child(3):hover { border-color: #00c8aa; animation: pulse-teal 1.4s ease-in-out infinite; }
    .tech-step:nth-child(4):hover { border-color: #f59e0b; animation: pulse-orange 1.4s ease-in-out infinite; }
    @keyframes pulse-blue {
      0%,100% { box-shadow: 0 0 8px rgba(26,111,232,.25), 0 0 20px rgba(26,111,232,.1); }
      50%      { box-shadow: 0 0 22px rgba(26,111,232,.6), 0 0 44px rgba(0,200,255,.25); }
    }
    @keyframes pulse-purple {
      0%,100% { box-shadow: 0 0 8px rgba(139,92,246,.25), 0 0 20px rgba(139,92,246,.1); }
      50%      { box-shadow: 0 0 22px rgba(139,92,246,.6), 0 0 44px rgba(192,132,252,.25); }
    }
    @keyframes pulse-teal {
      0%,100% { box-shadow: 0 0 8px rgba(0,200,170,.25), 0 0 20px rgba(0,200,170,.1); }
      50%      { box-shadow: 0 0 22px rgba(0,200,170,.6), 0 0 44px rgba(52,211,153,.25); }
    }
    @keyframes pulse-orange {
      0%,100% { box-shadow: 0 0 8px rgba(245,158,11,.25), 0 0 20px rgba(245,158,11,.1); }
      50%      { box-shadow: 0 0 22px rgba(245,158,11,.6), 0 0 44px rgba(251,191,36,.25); }
    }
    .tech-step-num {
      width: 48px; height: 48px; border-radius: 50%;
      background: linear-gradient(135deg, var(--sc), var(--sc2));
      display: flex; align-items: center; justify-content: center;
      font-size: 0.9rem; font-weight: 800; color: #fff;
      margin-bottom: 1.2rem; position: relative; z-index: 1;
      box-shadow: 0 0 12px rgba(0,0,0,.3);
    }
    .tech-step h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.6rem; color: var(--sc2, var(--text)); white-space: nowrap; }
    .tech-step-list {
      list-style: none;
      display: flex; flex-direction: column; gap: 0.3rem;
      margin-bottom: 0; padding: 0;
      z-index: 1; position: relative;
    }
    .tech-step-list li { font-size: 0.88rem; color: var(--muted); word-break: keep-all; line-height: 1.45; }
    .tech-step-list li::before { content: '· '; color: var(--sc, var(--accent)); }
    /* icon background area */
    .tech-step-bg {
      position: absolute;
      bottom: 0; left: 0; right: 0;
      height: 220px;
      display: flex; align-items: center; justify-content: center;
      padding-top: 3.5rem;
      opacity: 0.2;
      border-top: 1px solid rgba(255,255,255,0.05);
      background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.15) 100%);
      pointer-events: none;
      user-select: none;
      color: var(--sc2);
    }
    .tech-step-bg svg { width: 80px; height: 80px; }
    .tech-step:nth-child(1) .tech-step-bg { filter: drop-shadow(0 0 8px rgba(0,200,255,.3)); }
    .tech-step:nth-child(2) .tech-step-bg { filter: drop-shadow(0 0 8px rgba(192,132,252,.3)); }
    .tech-step:nth-child(3) .tech-step-bg { filter: drop-shadow(0 0 8px rgba(52,211,153,.3)); }
    .tech-step:nth-child(4) .tech-step-bg { filter: drop-shadow(0 0 8px rgba(251,191,36,.3)); }

    /* ─── SERVICE MODELS ─── */
    .service-models {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
      margin-top: 2.5rem;
    }
    .service-model-card {
      display: flex;
      align-items: flex-start;
      gap: 1.2rem;
      background: rgba(26,111,232,0.08);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 1.6rem 1.8rem;
      transition: border-color 0.2s, transform 0.2s;
    }
    .service-model-card:hover { border-color: var(--accent2); transform: translateY(-3px); }
    .service-model-icon {
      width: 48px; height: 48px; flex-shrink: 0;
      border-radius: 12px;
      display: flex; align-items: center; justify-content: center;
      font-size: 1.4rem;
    }
    .service-model-card:nth-child(1) .service-model-icon { background: rgba(26,111,232,0.2); }
    .service-model-card:nth-child(2) .service-model-icon { background: rgba(0,200,255,0.15); }
    .service-model-label {
      font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--accent2); margin-bottom: 0.3rem;
    }
    .service-model-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.4rem; }
    .service-model-card p { font-size: 0.86rem; color: var(--muted); line-height: 1.55; }
    @media (max-width: 600px) {
      .service-models { grid-template-columns: 1fr; }
    }

    /* ─── BUSINESS MODEL ─── */
    #bizmodel { background: var(--primary); }
    .phase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 1rem; }
    .phase-card { border: 1.5px solid #3b82f6; border-radius: 14px; padding: 1.8rem; background: var(--surface); box-shadow: 0 0 0 1px rgba(59,130,246,0.15), 0 4px 16px rgba(59,130,246,0.1); }
    .phase-badge { font-size: 0.72rem; font-weight: 700; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; }
    .phase-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.3rem; }
    .phase-horizon { font-size: 0.78rem; color: var(--accent2); margin-bottom: 1rem; }
    .phase-card ul { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
    .phase-card ul li { font-size: 0.84rem; color: var(--muted); }
    .phase-card ul li::before { content: '· '; color: var(--accent2); }

    /* ─── PATENTS ─── */
    #patents { background: var(--surface); }
    .patents-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.4rem; }
    .patent-card {
      border: 1px solid var(--border);
      border-radius: 14px;
      overflow: hidden;
      background: rgba(10,22,40,0.5);
      transition: border-color 0.2s, transform 0.2s;
      cursor: zoom-in;
    }
    .patent-card:hover { border-color: var(--accent2); transform: translateY(-4px); }
    .patent-thumb {
      width: 100%;
      height: 220px;
      overflow: hidden;
      background: #fff;
      display: flex;
      align-items: flex-start;
      justify-content: center;
    }
    .patent-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: top;
      display: block;
      transition: transform 0.3s;
    }
    .patent-card:hover .patent-thumb img { transform: scale(1.04); }
    .patent-info { padding: 1rem 1.2rem; }
    .patent-info h4 { font-size: 0.88rem; font-weight: 700; margin-bottom: 0.3rem; line-height: 1.4; }
    .patent-info span { font-size: 0.78rem; color: var(--muted); }
    .patent-flag {
      display: inline-block;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 0.5rem;
    }
    .patent-flag.kr { background: rgba(26,111,232,0.2); color: var(--accent2); }
    .patent-flag.us { background: rgba(255,100,50,0.15); color: #ff8866; }

    /* ─── TEAM ─── */
    #team { background: var(--primary); }
    .team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; }
    .team-card {
      border: 1px solid var(--border);
      border-radius: 16px;
      overflow: hidden;
      background: var(--surface);
      transition: border-color 0.2s, transform 0.2s;
    }
    .team-card:hover { border-color: var(--accent2); transform: translateY(-4px); }
    .team-photo {
      width: 100%;
      height: 260px;
      overflow: hidden;
      background: #1a2a3a;
    }
    .team-photo img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center top;
      display: block;
      transition: transform 0.4s;
    }
    .team-card:hover .team-photo img { transform: scale(1.04); }
    .team-info { padding: 1.4rem 1.6rem 1.8rem; }
    .team-info h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.2rem; }
    .team-info .role { font-size: 0.8rem; color: var(--accent2); font-weight: 600; margin-bottom: 0.8rem; letter-spacing: 0.05em; }
    .exp-list { list-style: none; display: flex; flex-direction: column; gap: 0.3rem; margin-top: 0.6rem; }
    .exp-list li { font-size: 0.82rem; color: var(--muted); }
    .exp-list li::before { content: '· '; color: var(--accent); }

    /* ─── CONTACT ─── */
    #contact {
      background: linear-gradient(135deg, #0a1f3d 0%, #0f2040 50%, #0a2850 100%);
      text-align: center;
      border-top: 1px solid var(--border);
    }
    #contact .section-title { color: #fff; }
    #contact .section-desc { margin: 0 auto 2.5rem; }
    .contact-details { display: flex; justify-content: center; gap: 3rem; margin-top: 3rem; flex-wrap: wrap; }
    .contact-item .label { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; margin-bottom: 0.3rem; }
    .contact-item .value { font-size: 1rem; font-weight: 700; }
    .contact-item a { color: var(--accent2); text-decoration: none; }

    /* ─── FOOTER ─── */
    footer {
      background: #05101f;
      text-align: center;
      padding: 2rem 5%;
      border-top: 1px solid rgba(255,255,255,0.05);
      font-size: 0.82rem;
      color: var(--muted);
    }
    footer img { height: 28px; vertical-align: middle; margin-right: 1rem; }

    /* ─── LIGHTBOX ─── */
    .lightbox {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 9999;
      background: rgba(5,16,31,0.96);
      align-items: center;
      justify-content: center;
      cursor: zoom-out;
    }
    .lightbox.open { display: flex; }
    .lightbox img {
      width: 90vw;
      height: 90vh;
      object-fit: contain;
      cursor: zoom-out;
      border-radius: 8px;
      box-shadow: 0 20px 80px rgba(0,0,0,0.7);
      background: transparent;
    }
    .lightbox-close {
      position: absolute;
      top: 24px; right: 32px;
      font-size: 2rem;
      color: #fff;
      cursor: pointer;
      opacity: 0.7;
      transition: opacity 0.2s;
      line-height: 1;
    }
    .lightbox-close:hover { opacity: 1; }

    /* ─── RESPONSIVE ─── */
    @media (max-width: 900px) {
      .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
      .alt-timeline::before { left: 1rem; }
      .alt-item, .alt-item.right, .alt-item.left { width: 100%; margin-left: 2.5rem; }
      .alt-item::before { left: -1.65rem !important; right: auto !important; }
      .alt-item::after { left: -1.1rem !important; right: auto !important; width: 0.8rem; }
      .comp-grid { grid-template-columns: 1fr; }
      .tech-steps { grid-template-columns: repeat(2, 1fr); }
      .tech-steps::before { display: none; }
      .team-grid { grid-template-columns: 1fr 1fr; }
      .phase-grid { grid-template-columns: 1fr; }
    }
    .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
    .hamburger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; display: block; }

    @media (max-width: 960px) {
      .nav-links { display: none; }
      .nav-right .lang-slider { display: none; }
      .mobile-only { display: block; }
      .nav-links li { display: block; }
      .nav-links li a { display: block; padding: 10px 0; }
      .hamburger { display: flex; }
      .hero-stats { gap: 1.8rem; }
      .team-grid { grid-template-columns: 1fr; }
      .tech-steps { grid-template-columns: 1fr; }
      .solutions-grid { grid-template-columns: 1fr; }
      .hero-right-img { display: none; }
    }

    /* Scroll fade-in */
    .fade-in { opacity: 0; transform: translateY(28px); transition: opacity 0.65s ease, transform 0.65s ease; }
    .fade-in.visible { opacity: 1; transform: none; }

  #top-btn {
    position: fixed; bottom: 32px; right: 32px; z-index: 999;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--accent); color: #fff;
    border: none; font-size: 1.2rem; cursor: pointer;
    box-shadow: 0 4px 16px rgba(26,111,232,.4);
    opacity: 0; pointer-events: none;
    transition: opacity .3s, transform .2s;
  }
  #top-btn.show { opacity: 1; pointer-events: auto; }
  #top-btn:hover { transform: translateY(-3px); }