:root {
      --bg: #0f1319;
      --panel-a: #11161d;
      --panel-b: #181e27;
      --panel-c: #151a22;
      --text: rgba(255,255,255,0.96);
      --muted: rgba(255,255,255,0.60);
      --soft: rgba(255,255,255,0.08);
      --soft-2: rgba(255,255,255,0.04);
      --border: rgba(255,255,255,0.08);
      --border-strong: rgba(255,255,255,0.14);
      --button: #4f46e5;
      --button-hover: #6366f1;
      --shadow: 0 30px 80px rgba(0,0,0,0.28);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html,
    body {
      min-height: 100%;
      scroll-behavior: smooth;
    }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
    }

    .page {
      min-height: 100vh;
      background:
        radial-gradient(circle at 56% 24%, rgba(79, 70, 229, 0.14), transparent 18%),
        radial-gradient(circle at 73% 42%, rgba(255,255,255,0.05), transparent 14%),
        radial-gradient(circle at 28% 78%, rgba(84, 111, 194, 0.07), transparent 24%),
        linear-gradient(112deg, var(--panel-a) 0%, var(--panel-b) 38%, var(--panel-c) 72%, #12171e 100%);
      box-shadow:
        inset 0 0 0 1px rgba(255,255,255,0.03),
        inset 0 26px 90px rgba(255,255,255,0.02),
        inset 0 -60px 120px rgba(0,0,0,0.22);
    }

    .page::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background:
        radial-gradient(circle at center, transparent 42%, rgba(0,0,0,0.16) 100%),
        linear-gradient(90deg, rgba(255,255,255,0.02), transparent 15%, transparent 85%, rgba(255,255,255,0.018));
    }

    .container {
      position: relative;
      z-index: 1;
      width: min(100%, 1080px);
      margin: 0 auto;
      padding: 36px 20px 60px;
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 34px;
    }

    .back {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: rgba(255,255,255,0.58);
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.12em;
      text-decoration: none;
    }

    .back:hover {
      color: rgba(255,255,255,0.9);
    }

    .brand {
      color: rgba(255,255,255,0.88);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }

    .hero {
      margin-bottom: 28px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      padding: 7px 11px;
      border: 1px solid var(--border);
      border-radius: 999px;
      background: var(--soft-2);
      color: rgba(255,255,255,0.72);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      margin-bottom: 16px;
    }

    .hero h1 {
      font-size: clamp(34px, 5vw, 56px);
      line-height: 1;
      letter-spacing: -0.04em;
      font-weight: 800;
      max-width: 760px;
    }

    .hero p {
      margin-top: 14px;
      max-width: 760px;
      color: var(--muted);
      font-size: 16px;
      line-height: 1.7;
      font-weight: 500;
    }

    .meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }

    .meta-chip {
      border: 1px solid var(--border);
      background: var(--soft-2);
      color: rgba(255,255,255,0.72);
      border-radius: 999px;
      padding: 8px 12px;
      font-size: 12px;
      font-weight: 700;
    }

    .layout {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 24px;
      align-items: start;
    }

    .sidebar {
      position: sticky;
      top: 24px;
      border: 1px solid var(--border);
      border-radius: 22px;
      background: linear-gradient(180deg, rgba(17,17,19,0.9), rgba(17,17,19,0.72));
      box-shadow: var(--shadow);
      padding: 18px;
    }

    .sidebar h2 {
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: rgba(255,255,255,0.72);
      margin-bottom: 14px;
    }

    .sidebar nav {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .sidebar a {
      color: rgba(255,255,255,0.66);
      text-decoration: none;
      font-size: 14px;
      line-height: 1.45;
      padding: 10px 12px;
      border-radius: 12px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .sidebar a:hover {
      background: rgba(255,255,255,0.05);
      color: rgba(255,255,255,0.94);
    }

    .content-card {
      border: 1px solid var(--border);
      border-radius: 28px;
      background: linear-gradient(180deg, rgba(17,17,19,0.94), rgba(17,17,19,0.82));
      box-shadow: var(--shadow);
      padding: 28px;
    }

    .section {
      scroll-margin-top: 24px;
    }

    .section + .section {
      margin-top: 30px;
      padding-top: 30px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }

    .section h3 {
      font-size: 24px;
      line-height: 1.15;
      letter-spacing: -0.02em;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .section p {
      color: var(--muted);
      font-size: 15px;
      line-height: 1.8;
      margin-bottom: 14px;
    }

    .section ul {
      margin: 8px 0 14px 20px;
      color: var(--muted);
    }

    .section li {
      margin-bottom: 10px;
      line-height: 1.7;
    }

    .footer-box {
      margin-top: 28px;
      border: 1px solid var(--border);
      border-radius: 18px;
      background: rgba(255,255,255,0.03);
      padding: 18px;
    }

    .footer-box p {
      margin: 0;
      color: rgba(255,255,255,0.68);
      font-size: 14px;
      line-height: 1.7;
    }

    .actions {
      margin-top: 22px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 18px;
      border-radius: 14px;
      text-decoration: none;
      font-size: 14px;
      font-weight: 800;
      transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
    }

    .btn-primary {
      background: var(--button);
      color: white;
      border: none;
    }

    .btn-primary:hover {
      background: var(--button-hover);
      transform: translateY(-1px);
    }

    .btn-secondary {
      border: 1px solid var(--border);
      background: rgba(255,255,255,0.03);
      color: rgba(255,255,255,0.9);
    }

    .btn-secondary:hover {
      background: rgba(255,255,255,0.05);
      transform: translateY(-1px);
    }

    @media (max-width: 940px) {
      .layout {
        grid-template-columns: 1fr;
      }

      .sidebar {
        position: static;
      }
    }

    @media (max-width: 640px) {
      .container {
        padding: 26px 16px 42px;
      }

      .content-card,
      .sidebar {
        padding: 20px;
        border-radius: 20px;
      }

      .section h3 {
        font-size: 20px;
      }

      .hero p,
      .section p,
      .section li {
        font-size: 14px;
      }
    }