*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --blue: #185FA5;
      --blue-light: #E6F1FB;
      --blue-mid: #378ADD;
      --blue-dark: #0C447C;
      --green: #3B6D11;
      --green-light: #EAF3DE;
      --red: #A32D2D;
      --red-light: #FCEBEB;
      --amber: #854F0B;
      --amber-light: #FAEEDA;
      --teal: #0F6E56;
      --teal-light: #E1F5EE;
      --purple: #534AB7;
      --purple-light: #EEEDFE;
      --coral: #993C1D;
      --coral-light: #FAECE7;
      --gray-50: #F1EFE8;
      --gray-100: #D3D1C7;
      --gray-200: #B4B2A9;
      --gray-600: #5F5E5A;
      --gray-700: #444441;
      --gray-900: #2C2C2A;
      --text: #1a1a18;
      --muted: #5F5E5A;
      --border: #D3D1C7;
      --surface: #ffffff;
      --page-bg: #F5F3EF;
      --radius: 14px;
      --radius-sm: 8px;
      --radius-pill: 50px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.07), 0 2px 6px rgba(0,0,0,0.04);
      --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--page-bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    /* ── SCROLLBAR ── */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--gray-50); }
    ::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: 3px; }

    /* ── READING PROGRESS BAR ── */
    #reading-progress {
      position: fixed; top: 0; left: 0; z-index: 9999;
      height: 3px; width: 0%;
      background: linear-gradient(90deg, var(--blue-mid), #5BA8E8);
      transition: width 0.1s;
    }

    /* ── BREADCRUMB ── */
    .breadcrumb-nav {
      background: var(--page-bg);
      border-bottom: 1px solid var(--border);
      padding: 8px 20px;
    }
    .breadcrumb-list {
      list-style: none;
      display: flex; align-items: center; gap: 4px;
      max-width: 1140px; margin: 0 auto;
      font-size: 13px; color: var(--muted);
    }
    .breadcrumb-list li { display: flex; align-items: center; gap: 4px; }
    .breadcrumb-list a { color: var(--blue); text-decoration: none; }
    .breadcrumb-list a:hover { text-decoration: underline; }
    .breadcrumb-list .sep { color: var(--gray-200); }
    .breadcrumb-list .current { color: var(--muted); }

    /* ── NAV ── */
    .nav {
      position: sticky; top: 0; z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      padding: 0 20px;
    }
    .nav-inner {
      max-width: 1140px; margin: 0 auto;
      display: flex; align-items: center; justify-content: space-between;
      height: 58px; gap: 16px;
    }
    .nav-home {
      font-size: 20px; text-decoration: none;
      display: flex; align-items: center;
    }
    .nav-brand {
      font-size: 15px; font-weight: 700; color: var(--blue-dark);
      text-decoration: none; display: flex; align-items: center; gap: 8px; white-space: nowrap;
    }
    .nav-brand .dot {
      width: 8px; height: 8px; background: var(--blue-mid); border-radius: 50%;
      animation: pulse 2s ease-in-out infinite;
    }
    @keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(1.3)} }
    .nav-links {
      display: flex; gap: 4px; list-style: none; align-items: center; overflow-x: auto;
      scrollbar-width: none;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links a {
      font-size: 13px; font-weight: 500; color: var(--muted);
      text-decoration: none; padding: 6px 12px; border-radius: 8px;
      transition: background 0.15s, color 0.15s; white-space: nowrap;
    }
    .nav-links a:hover { background: var(--blue-light); color: var(--blue-dark); }
    .nav-badge {
      font-size: 11px; font-weight: 700; background: var(--blue-light);
      color: var(--blue-dark); padding: 4px 10px; border-radius: var(--radius-pill);
      border: 1px solid #B5D4F4; white-space: nowrap; flex-shrink: 0;
    }

    /* ── HERO ── */
    .hero {
      position: relative; overflow: hidden;
      color: white; text-align: center;
      padding: clamp(60px,10vw,100px) 20px clamp(50px,8vw,80px);
      min-height: 520px; display: flex; align-items: center; justify-content: center;
    }
    .hero-bg {
      position: absolute; inset: 0; z-index: 0;
      background-image: url('../images/hero-bg.png');
      background-size: cover; background-position: center;
    }
    .hero-bg::after {
      content: '';
      position: absolute; inset: 0;
      background: linear-gradient(160deg, rgba(12,36,84,0.88) 0%, rgba(24,95,165,0.82) 45%, rgba(55,138,221,0.75) 80%, rgba(91,168,232,0.7) 100%);
    }
    .hero::after {
      content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px; z-index: 2;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    }
    .hero-inner { position: relative; z-index: 1; width: 100%; }
    .hero-eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      background: rgba(255,255,255,0.12);
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: var(--radius-pill);
      padding: 6px 16px; font-size: 12px; font-weight: 600;
      letter-spacing: 0.5px; margin-bottom: 24px;
      text-transform: uppercase;
    }
    .hero-eyebrow::before {
      content: ''; width: 6px; height: 6px; background: #7FD4A0;
      border-radius: 50%; animation: pulse 2s ease-in-out infinite;
    }
    .hero h1 {
      font-size: clamp(2rem, 6vw, 3.8rem);
      font-weight: 800; line-height: 1.15; letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero h1 em {
      font-style: normal;
      background: linear-gradient(90deg, #7FD4A0, #60C4F0, #B8A4F8);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero p {
      font-size: clamp(1rem, 2vw, 1.2rem);
      opacity: 0.85; max-width: 580px;
      margin: 0 auto 40px; font-weight: 400;
    }
    .hero-stats {
      display: flex; justify-content: center;
      gap: clamp(20px, 4vw, 56px); flex-wrap: wrap;
    }
    .hero-stat { text-align: center; }
    .hero-stat .num {
      font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800;
      display: block; letter-spacing: -0.02em;
    }
    .hero-stat .lbl {
      font-size: 11px; opacity: 0.65;
      text-transform: uppercase; letter-spacing: 1.5px;
    }
    .hero-divider {
      width: 1px; height: 40px; background: rgba(255,255,255,0.2);
      align-self: center;
    }
    @media (max-width: 480px) { .hero-divider { display: none; } }

    /* ── CONTAINER ── */
    .container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

    /* ── SECTION ── */
    section { padding: clamp(48px, 7vw, 80px) 0; }
    .section-label {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 11px; font-weight: 700;
      text-transform: uppercase; letter-spacing: 2px;
      color: var(--blue); margin-bottom: 10px;
    }
    .section-label::before {
      content: ''; width: 16px; height: 2px;
      background: var(--blue-mid); border-radius: 1px;
    }
    .section-title {
      font-size: clamp(1.5rem, 3.5vw, 2.3rem);
      font-weight: 800; color: var(--gray-900);
      margin-bottom: 12px; letter-spacing: -0.02em; line-height: 1.2;
    }
    .section-desc {
      font-size: 1.05rem; color: var(--muted);
      max-width: 600px; margin-bottom: 44px; line-height: 1.7;
    }

    /* ── INTRO SECTION ── */
    .intro-wrap {
      background: white; border-radius: var(--radius);
      border: 1px solid var(--border); overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .intro-grid {
      display: grid; grid-template-columns: 1fr 1fr;
      gap: 0;
    }
    @media (max-width: 720px) { .intro-grid { grid-template-columns: 1fr; } }
    .intro-text { padding: clamp(24px, 4vw, 44px); }
    .intro-text h3 {
      font-size: clamp(1.1rem, 2vw, 1.4rem);
      font-weight: 800; margin-bottom: 14px;
      letter-spacing: -0.02em; line-height: 1.2;
    }
    .intro-text p {
      font-size: 0.96rem; color: #444441;
      line-height: 1.75; margin-bottom: 12px;
    }

    /* ── RELATED TOPICS ── */
    .related-topics {
      margin-top: 32px; padding: 24px;
      background: white; border-radius: var(--radius);
      border: 1px solid var(--border); box-shadow: var(--shadow-sm);
    }
    .related-topics h3 {
      font-size: 13px; font-weight: 800; color: var(--muted);
      text-transform: uppercase; letter-spacing: 1px; margin-bottom: 14px;
    }
    .related-links { display: flex; flex-wrap: wrap; gap: 8px; }
    .related-link {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 7px 14px; border-radius: var(--radius-pill);
      background: var(--page-bg); border: 1px solid var(--border);
      font-size: 13px; font-weight: 600; color: var(--blue);
      text-decoration: none; transition: background 0.15s, border-color 0.15s;
    }
    .related-link:hover { background: var(--blue-light); border-color: #B5D4F4; }

    /* ── INTRO IMAGE PANEL ── */
    .intro-image-panel {
      position: relative; overflow: hidden;
      border-left: 1px solid var(--border);
      min-height: 340px;
    }
    @media (max-width: 720px) {
      .intro-image-panel { border-left: none; border-top: 1px solid var(--border); min-height: 220px; }
    }
    .intro-image-panel img {
      width: 100%; height: 100%;
      object-fit: cover; display: block;
      transition: transform 0.5s ease;
    }
    .intro-image-panel:hover img { transform: scale(1.03); }
    .intro-image-overlay {
      position: absolute; inset: 0;
      background: linear-gradient(135deg, rgba(12,68,124,0.45) 0%, rgba(55,138,221,0.2) 100%);
      display: flex; flex-direction: column; gap: 14px;
      padding: clamp(20px, 3vw, 36px); justify-content: flex-end;
    }
    .highlight-item { display: flex; gap: 14px; align-items: flex-start; }
    .hi-icon {
      width: 38px; height: 38px; border-radius: 10px;
      background: rgba(255,255,255,0.18);
      backdrop-filter: blur(8px);
      display: flex; align-items: center; justify-content: center;
      font-size: 17px; flex-shrink: 0;
      border: 1px solid rgba(255,255,255,0.3);
      box-shadow: var(--shadow-sm);
    }
    .hi-text strong {
      font-size: 13.5px; font-weight: 700; display: block;
      margin-bottom: 2px; color: #ffffff;
    }
    .hi-text span { font-size: 12.5px; color: rgba(255,255,255,0.8); line-height: 1.5; }

    /* ── HOW IT WORKS ── */
    .how-section-wrap {
      display: grid; grid-template-columns: 1fr 340px; gap: 32px; align-items: start;
    }
    @media (max-width: 900px) { .how-section-wrap { grid-template-columns: 1fr; } }
    .how-image-block {
      position: sticky; top: 80px;
      border-radius: var(--radius); overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
    }
    .how-image-block img {
      width: 100%; height: 400px; object-fit: cover; display: block;
    }
    .how-image-caption {
      background: var(--gray-900); color: #93c5fd;
      padding: 14px 18px; font-size: 12px; font-weight: 600;
      letter-spacing: 0.3px; text-align: center;
    }
    @media (max-width: 900px) { .how-image-block { position: static; } }

    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 16px;
    }
    .step-card {
      background: white; border: 1px solid var(--border);
      border-radius: var(--radius); padding: 24px 20px;
      position: relative; overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .step-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .step-card::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--blue-mid), #5BA8E8);
    }
    .step-num {
      font-size: 2.5rem; font-weight: 900;
      color: var(--blue-mid); opacity: 0.12;
      line-height: 1; margin-bottom: 10px;
      font-feature-settings: "tnum";
    }
    .step-card h3 {
      font-size: 0.95rem; font-weight: 700;
      margin-bottom: 7px; color: var(--gray-900);
    }
    .step-card p { font-size: 12.5px; color: var(--muted); line-height: 1.65; }

    /* ── TIMELINE ── */
    .timeline-layout {
      display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start;
    }
    @media (max-width: 820px) { .timeline-layout { grid-template-columns: 1fr; } }
    .timeline-images { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 80px; }
    @media (max-width: 820px) { .timeline-images { position: static; order: -1; } }
    .tl-img-card {
      border-radius: var(--radius); overflow: hidden;
      box-shadow: var(--shadow-md); border: 1px solid var(--border);
      position: relative;
    }
    .tl-img-card img { width: 100%; height: 200px; object-fit: cover; display: block; transition: transform 0.4s ease; }
    .tl-img-card:hover img { transform: scale(1.04); }
    .tl-img-label {
      position: absolute; bottom: 0; left: 0; right: 0;
      background: linear-gradient(to top, rgba(12,36,84,0.85), transparent);
      color: white; padding: 24px 16px 14px;
      font-size: 12px; font-weight: 700; letter-spacing: 0.3px;
    }
    .tl-img-year {
      display: inline-block; background: var(--blue-mid);
      color: white; padding: 2px 8px; border-radius: 4px;
      font-size: 10px; font-weight: 800; margin-bottom: 4px;
    }

    .timeline-wrap {
      background: white; border-radius: var(--radius);
      border: 1px solid var(--border); padding: clamp(24px, 4vw, 44px);
      box-shadow: var(--shadow-sm);
    }
    .timeline { position: relative; padding-left: 36px; }
    .timeline::before {
      content: ''; position: absolute;
      left: 12px; top: 8px; bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--blue-mid), #B5D4F4, transparent);
    }
    .tl-item { position: relative; margin-bottom: 36px; }
    .tl-item:last-child { margin-bottom: 0; }
    .tl-dot {
      position: absolute; left: -29px; top: 5px;
      width: 16px; height: 16px;
      background: var(--blue-mid); border: 3px solid white;
      border-radius: 50%;
      box-shadow: 0 0 0 2px var(--blue-mid);
    }
    .tl-year {
      font-size: 11px; font-weight: 800;
      color: var(--blue); margin-bottom: 5px;
      text-transform: uppercase; letter-spacing: 1px;
    }
    .tl-title {
      font-size: 1rem; font-weight: 700;
      margin-bottom: 5px; color: var(--gray-900);
    }
    .tl-desc { font-size: 0.92rem; color: var(--muted); line-height: 1.65; }

    /* ── BOT CARDS ── */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 22px;
    }
    @media (max-width: 700px) { .cards-grid { grid-template-columns: 1fr; } }
    .bot-card {
      background: white; border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      display: flex; flex-direction: column;
      transition: transform 0.22s cubic-bezier(.25,.46,.45,.94), box-shadow 0.22s;
    }
    .bot-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .bot-card-accent {
      height: 4px;
      background: linear-gradient(90deg, var(--accent-from, #378ADD), var(--accent-to, #5BA8E8));
    }
    .bot-header {
      padding: 22px 24px 16px;
      border-bottom: 1px solid var(--border);
      display: flex; align-items: flex-start; gap: 16px;
    }
    .bot-icon {
      width: 54px; height: 54px;
      border-radius: 14px;
      display: flex; align-items: center; justify-content: center;
      font-size: 26px; flex-shrink: 0;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .bot-icon img {
      width: 100%; height: 100%;
      object-fit: cover;
      border-radius: 14px;
    }
    .bot-meta h3 {
      font-size: 1.2rem; font-weight: 800;
      margin-bottom: 2px; color: var(--gray-900);
    }
    .bot-meta .by { font-size: 13px; color: var(--muted); }
    .bot-meta .by span { font-weight: 700; color: var(--blue); }
    .founded-badge {
      display: inline-block; background: var(--gray-50);
      border-radius: 6px; padding: 3px 8px;
      font-size: 11px; color: var(--muted);
      margin-top: 5px; border: 1px solid var(--border);
    }
    .bot-body { padding: 20px 24px; flex: 1; display: flex; flex-direction: column; gap: 16px; }
    .bot-desc { font-size: 0.93rem; color: #444441; line-height: 1.68; }
    .bot-info-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
    }
    .info-item {
      background: var(--page-bg); border-radius: 8px;
      padding: 10px 12px; border: 1px solid var(--border);
    }
    .info-item .il {
      font-size: 10.5px; text-transform: uppercase;
      letter-spacing: 0.5px; color: var(--muted);
      font-weight: 700; margin-bottom: 3px;
    }
    .info-item .iv { font-size: 12.5px; font-weight: 700; color: var(--gray-900); }
    .pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .pros, .cons { border-radius: 9px; padding: 12px 14px; }
    .pros { background: var(--green-light); border: 1px solid #C0DD97; }
    .cons { background: var(--red-light); border: 1px solid #F7C1C1; }
    .pros h4 { color: #3B6D11; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
    .cons h4 { color: #A32D2D; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
    .pros ul, .cons ul { list-style: none; }
    .pros li, .cons li { font-size: 12px; padding: 2.5px 0; display: flex; align-items: flex-start; gap: 5px; color: #444441; }
    .pros li::before { content: '✓'; color: #3B6D11; font-weight: 800; flex-shrink: 0; font-size: 10px; margin-top: 2px; }
    .cons li::before { content: '✕'; color: #A32D2D; font-weight: 800; flex-shrink: 0; font-size: 10px; margin-top: 2px; }
    .bot-tags { display: flex; flex-wrap: wrap; gap: 6px; }
    .tag {
      font-size: 11px; font-weight: 700;
      padding: 4px 10px; border-radius: var(--radius-pill);
      border: 1px solid; letter-spacing: 0.2px;
    }
    .tag-blue { background: var(--blue-light); color: var(--blue-dark); border-color: #B5D4F4; }
    .tag-green { background: var(--green-light); color: var(--green); border-color: #C0DD97; }
    .tag-amber { background: var(--amber-light); color: var(--amber); border-color: #FAC775; }
    .tag-purple { background: var(--purple-light); color: var(--purple); border-color: #CECBF6; }
    .tag-coral { background: var(--coral-light); color: var(--coral); border-color: #F5C4B3; }
    .tag-teal { background: var(--teal-light); color: var(--teal); border-color: #9FE1CB; }
    .rating-bar { padding-top: 14px; border-top: 1px solid var(--border); }
    .rating-row { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--muted); margin-bottom: 8px; }
    .rating-row .rv { font-weight: 800; color: var(--gray-900); font-size: 14px; }
    .bar { height: 6px; background: var(--gray-50); border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
    .bar-fill { height: 100%; border-radius: 10px; }
    .best-for-block {
      background: var(--blue-light); border-radius: 9px;
      padding: 12px 14px; border: 1px solid #B5D4F4;
    }
    .best-for-block .bfl {
      font-size: 10.5px; font-weight: 800; color: var(--blue-dark);
      text-transform: uppercase; letter-spacing: 1px; margin-bottom: 5px;
    }
    .best-for-block p { font-size: 12.5px; color: var(--blue-dark); line-height: 1.55; }

    /* ── COMPARE TABLE ── */
    .table-wrap {
      background: white; border-radius: var(--radius);
      border: 1px solid var(--border); overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    table { width: 100%; border-collapse: collapse; min-width: 700px; }
    thead tr {
      background: var(--gray-900); color: white;
    }
    thead th {
      padding: 14px 16px; font-size: 12px;
      font-weight: 700; text-align: left;
      white-space: nowrap; letter-spacing: 0.3px;
    }
    tbody td {
      padding: 13px 16px; font-size: 13px;
      border-bottom: 1px solid var(--border);
      vertical-align: middle; color: var(--gray-700);
    }
    tbody tr:last-child td { border-bottom: none; }
    tbody tr:hover td { background: var(--page-bg); }
    .rank {
      display: inline-flex; align-items: center; justify-content: center;
      width: 28px; height: 28px;
      border-radius: 50%; font-weight: 800; font-size: 12px;
    }
    .rank-1 { background: #FAEEDA; color: #854F0B; border: 1px solid #FAC775; }
    .rank-2 { background: var(--gray-50); color: var(--gray-600); border: 1px solid var(--gray-100); }
    .rank-3 { background: var(--coral-light); color: var(--coral); border: 1px solid #F5C4B3; }
    .rank-n { background: var(--blue-light); color: var(--blue); border: 1px solid #B5D4F4; }
    .score-pill {
      display: inline-block; font-weight: 800;
      font-size: 13px; color: var(--blue-dark);
    }
    tbody td a { color: var(--blue); text-decoration: none; font-weight: 700; }
    tbody td a:hover { text-decoration: underline; }

    /* ── USE CASES ── */
    .usecase-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }
    .usecase-card {
      background: white; border: 1px solid var(--border);
      border-radius: var(--radius); overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex; flex-direction: column;
    }
    .usecase-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .usecase-img {
      width: 100%; height: 150px; object-fit: cover; display: block;
      transition: transform 0.4s ease;
    }
    .usecase-card:hover .usecase-img { transform: scale(1.05); }
    .usecase-img-wrap { overflow: hidden; position: relative; }
    .usecase-img-wrap::after {
      content: '';
      position: absolute; inset: 0;
      background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.18) 100%);
    }
    .usecase-body { padding: 18px 18px 20px; flex: 1; }
    .usecase-icon {
      font-size: 26px; margin-bottom: 10px;
      display: block;
    }
    .usecase-card h3 {
      font-size: 0.95rem; font-weight: 800;
      margin-bottom: 7px; color: var(--gray-900);
    }
    .usecase-card p { font-size: 12.5px; color: var(--muted); line-height: 1.6; }
    .best-for-tag {
      margin-top: 12px; padding-top: 12px;
      border-top: 1px solid var(--border);
      font-size: 11px; font-weight: 700; color: var(--blue);
    }
    .best-for-tag a { color: var(--blue); text-decoration: none; }
    .best-for-tag a:hover { text-decoration: underline; }

    /* ── STATS STRIP ── */
    .stats-strip {
      background: var(--gray-900); color: white;
      padding: 48px 0;
    }
    .stats-inner {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 20px; text-align: center;
    }
    .stat-item .sn {
      font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800;
      color: #85B7EB; display: block;
      margin-bottom: 6px; letter-spacing: -0.02em;
    }
    .stat-item .sl { font-size: 12.5px; color: #888780; line-height: 1.4; }

    /* ── FAQ ── */
    .faq-item {
      background: white; border: 1px solid var(--border);
      border-radius: var(--radius-sm); margin-bottom: 10px;
      overflow: hidden; box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s;
    }
    .faq-item:hover { box-shadow: var(--shadow-md); }
    .faq-q {
      padding: 17px 22px; font-weight: 700; font-size: 0.97rem;
      cursor: pointer; display: flex; justify-content: space-between;
      align-items: center; user-select: none; gap: 16px;
      color: var(--gray-900);
    }
    .faq-q h3 { font-size: inherit; font-weight: inherit; color: inherit; }
    .faq-q:hover { background: var(--page-bg); }
    .faq-icon {
      width: 26px; height: 26px; border-radius: 50%;
      background: var(--blue-light); display: flex; align-items: center;
      justify-content: center; flex-shrink: 0; font-size: 16px;
      color: var(--blue); font-weight: 700;
      transition: transform 0.25s, background 0.2s;
    }
    .faq-a {
      padding: 0 22px; font-size: 0.93rem; color: var(--muted);
      max-height: 0; overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      line-height: 1.75;
    }
    .faq-item.open { box-shadow: var(--shadow-md); }
    .faq-item.open .faq-a { max-height: 350px; padding: 0 22px 18px; }
    .faq-item.open .faq-icon { background: var(--blue); color: white; transform: rotate(45deg); }
    .faq-item.open .faq-q { color: var(--blue-dark); }

    /* ── CONCLUSION ── */
    .conclusion {
      position: relative; overflow: hidden;
      color: white; text-align: center;
      padding: clamp(60px, 10vw, 90px) 20px;
    }
    .conclusion-bg {
      position: absolute; inset: 0; z-index: 0;
      background-image: url('../images/conclusion-city.jpg');
      background-size: cover; background-position: center;
    }
    .conclusion-bg::after {
      content: '';
      position: absolute; inset: 0;
      background: linear-gradient(160deg, rgba(12,36,84,0.92) 0%, rgba(24,95,165,0.85) 60%, rgba(55,138,221,0.80) 100%);
    }
    .conclusion-inner { position: relative; z-index: 1; max-width: 700px; margin: 0 auto; }
    .conclusion h2 {
      font-size: clamp(1.6rem, 4vw, 2.5rem); font-weight: 800;
      margin-bottom: 18px; letter-spacing: -0.02em; line-height: 1.2;
    }
    .conclusion p {
      font-size: 1.05rem; opacity: 0.85;
      max-width: 640px; margin: 0 auto 36px; line-height: 1.8;
    }
    .cta-group {
      display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
    }
    .cta-btn {
      padding: 13px 26px; border-radius: 10px;
      text-decoration: none; font-weight: 700; font-size: 14px;
      transition: transform 0.18s, box-shadow 0.18s;
      display: inline-flex; align-items: center; gap: 6px;
    }
    .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.25); }
    .cta-primary { background: white; color: var(--blue-dark); }
    .cta-secondary {
      background: rgba(255,255,255,0.12);
      border: 1px solid rgba(255,255,255,0.35);
      color: white;
    }

    /* ── FOOTER ── */
    footer {
      background: #1f1f1d; color: #888780;
      text-align: center; padding: 32px 20px;
      font-size: 13px;
    }
    footer a { color: #85B7EB; text-decoration: none; }
    footer a:hover { color: #B5D4F4; }
    .footer-links {
      display: flex; justify-content: center;
      gap: 20px; flex-wrap: wrap;
      margin-bottom: 14px;
    }
    .footer-links a { font-size: 13px; }

    /* ── BACK TO TOP ── */
    .back-top {
      position: fixed; bottom: 24px; right: 24px; z-index: 99;
      width: 44px; height: 44px;
      background: var(--blue); color: white;
      border-radius: 50%; border: none; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 16px rgba(24,95,165,0.4);
      font-size: 20px; transition: opacity 0.3s, transform 0.2s;
      opacity: 0; pointer-events: none; text-decoration: none;
    }
    .back-top.visible { opacity: 1; pointer-events: auto; }
    .back-top:hover { transform: scale(1.1); }

    /* ── RESPONSIVE ── */
    @media (max-width: 900px) {
      .cards-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    }
    @media (max-width: 640px) {
      .nav-links { display: none; }
      .steps-grid { grid-template-columns: 1fr 1fr; }
      .bot-info-grid { grid-template-columns: 1fr 1fr; }
      .pros-cons { grid-template-columns: 1fr; }
      .usecase-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-inner { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 420px) {
      .steps-grid { grid-template-columns: 1fr; }
      .usecase-grid { grid-template-columns: 1fr; }
    }

    /* ── BG ALTERNATION ── */
    section.alt { background: white; }
    section.light { background: var(--page-bg); }

    /* ── SMOOTH HOVER CARD ── */
    .card-lift {
      transition: transform 0.22s cubic-bezier(.25,.46,.45,.94), box-shadow 0.22s;
    }
    .card-lift:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }