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

    :root {
      --bg:        #050a0f;
      --surface:   #0b1520;
      --surface2:  #0f1e2e;
      --border:    #1a3a55;
      --accent:    #00c8ff;
      --accent2:   #00ff9d;
      --danger:    #ff4060;
      --warn:      #ffc84a;
      --text:      #c8dce8;
      --text-dim:  #5a7a90;
      --font-mono: 'Share Tech Mono', monospace;
      --font-head: 'Rajdhani', sans-serif;
      --font-body: 'Exo 2', sans-serif;
    }

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

    body {
      background: var(--bg);
      color: var(--text);
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
    }

    body::before {
      content: '';
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image:
        linear-gradient(rgba(0,200,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,200,255,0.04) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none; z-index: 0;
    }
    body::after {
      content: '';
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      background: repeating-linear-gradient(
        0deg, transparent, transparent 2px,
        rgba(0,0,0,0.08) 2px, rgba(0,0,0,0.08) 4px
      );
      pointer-events: none; z-index: 0;
    }

    nav {
      position: relative; z-index: 10;
      display: flex; align-items: center;
      justify-content: space-between;
      padding: 0 2.5rem; height: 64px;
      background: rgba(5,10,15,0.95);
      border-bottom: 1px solid var(--border);
    }
    .nav-logo {
      font-family: var(--font-mono); font-size: 1.1rem;
      color: var(--accent); text-decoration: none; letter-spacing: 0.1em;
    }
    .nav-logo span { color: var(--accent2); }
    .nav-back {
      font-family: var(--font-head); font-size: 0.85rem; font-weight: 600;
      letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--text-dim); text-decoration: none;
      display: flex; align-items: center; gap: 0.4rem;
      transition: color 0.2s;
    }
    .nav-back:hover { color: var(--accent); }
    .nav-back::before { content: '<-'; }

    main {
      flex: 1;
      position: relative; z-index: 1;
      max-width: 900px;
      width: 100%;
      margin: 0 auto;
      padding: 3rem 2rem 5rem;
    }

    .page-header {
      text-align: center;
      margin-bottom: 3rem;
      padding-bottom: 2rem;
      border-bottom: 1px solid var(--border);
    }
    .page-badge {
      font-family: var(--font-mono); font-size: 0.72rem;
      color: var(--accent2); letter-spacing: 0.25em; text-transform: uppercase;
      border: 1px solid var(--accent2); padding: 0.25rem 0.9rem;
      display: inline-block; margin-bottom: 1rem;
    }
    .page-header h1 {
      font-family: var(--font-head); font-size: 2.8rem; font-weight: 700;
      line-height: 1.1; margin-bottom: 0.5rem;
    }
    .page-header h1 span { color: var(--accent); }
    .page-header p { color: var(--text-dim); font-size: 0.95rem; }

    .pdf-btn {
      display: inline-flex; align-items: center; gap: 0.6rem;
      font-family: var(--font-head); font-weight: 700; font-size: 0.95rem;
      letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--bg); background: var(--accent2);
      padding: 0.85rem 2rem; margin-top: 1.5rem;
      text-decoration: none;
      clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
      transition: background 0.2s, transform 0.15s;
    }
    .pdf-btn:hover { background: var(--accent); transform: translateY(-2px); }

    .toc {
      background: var(--surface);
      border: 1px solid var(--border);
      border-left: 3px solid var(--accent);
      padding: 1.5rem 2rem;
      margin-bottom: 3rem;
    }
    .toc-title {
      font-family: var(--font-mono); font-size: 0.75rem;
      color: var(--accent); letter-spacing: 0.2em; text-transform: uppercase;
      margin-bottom: 1rem;
    }
    .toc ol { padding-left: 1.2rem; }
    .toc li { margin-bottom: 0.3rem; color: var(--text-dim); font-size: 0.9rem; }
    .toc a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
    .toc a:hover { color: var(--accent2); }
    .toc ol ol { margin-top: 0.2rem; }
    .toc ol ol li { font-size: 0.85rem; }

    .manual-section {
      margin-bottom: 3.5rem;
    }

    .section-num {
      font-family: var(--font-mono); font-size: 0.72rem;
      color: var(--accent2); letter-spacing: 0.2em;
      text-transform: uppercase; margin-bottom: 0.4rem;
    }

    .manual-section h2 {
      font-family: var(--font-head); font-size: 2rem; font-weight: 700;
      color: var(--accent); margin-bottom: 1rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border);
    }

    .manual-section h3 {
      font-family: var(--font-head); font-size: 1.3rem; font-weight: 700;
      color: var(--text); margin: 2rem 0 0.8rem;
    }

    .manual-section p {
      color: var(--text-dim); margin-bottom: 1rem; font-size: 0.95rem;
    }

    .steps { list-style: none; margin: 1rem 0 1.5rem; }
    .steps li {
      display: flex; gap: 1rem; align-items: flex-start;
      padding: 0.6rem 0; border-bottom: 1px solid rgba(26,58,85,0.4);
      font-size: 0.92rem; color: var(--text-dim);
    }
    .steps li:last-child { border-bottom: none; }
    .step-num {
      font-family: var(--font-mono); font-size: 0.75rem;
      color: var(--bg); background: var(--accent);
      min-width: 22px; height: 22px;
      display: flex; align-items: center; justify-content: center;
      flex-shrink: 0; margin-top: 0.15rem;
    }

    .terminal {
      background: #020810;
      border: 1px solid var(--border);
      border-left: 3px solid var(--accent2);
      padding: 1.2rem 1.5rem;
      margin: 1rem 0 1.5rem;
      font-family: var(--font-mono);
      font-size: 0.82rem;
      color: var(--accent2);
      overflow-x: auto;
      white-space: pre;
    }
    .terminal .prompt { color: #00ff9d; }
    .terminal .comment { color: var(--text-dim); }
    .terminal .highlight { color: #ffd700; }

    .cmd-table {
      width: 100%; border-collapse: collapse;
      margin: 1rem 0 1.5rem;
      font-size: 0.88rem;
    }
    .cmd-table th {
      font-family: var(--font-mono); font-size: 0.72rem;
      letter-spacing: 0.15em; text-transform: uppercase;
      color: var(--accent2); background: var(--surface2);
      padding: 0.7rem 1rem; text-align: left;
      border-bottom: 2px solid var(--accent);
    }
    .cmd-table td {
      padding: 0.7rem 1rem;
      border-bottom: 1px solid rgba(26,58,85,0.5);
      color: var(--text-dim);
      vertical-align: top;
    }
    .cmd-table td:first-child {
      font-family: var(--font-mono); font-size: 0.8rem;
      color: var(--accent); white-space: nowrap;
    }
    .cmd-table tr:hover td { background: rgba(0,200,255,0.03); }

    .box {
      padding: 1rem 1.2rem;
      margin: 1rem 0 1.5rem;
      font-size: 0.88rem;
      border-left: 3px solid;
      font-family: var(--font-body);
    }
    .box-note {
      background: rgba(0,200,255,0.05);
      border-color: var(--accent);
      color: var(--text);
    }
    .box-note strong { color: var(--accent); }
    .box-warn {
      background: rgba(255,200,74,0.05);
      border-color: var(--warn);
      color: var(--text);
    }
    .box-warn strong { color: var(--warn); }
    .box-danger {
      background: rgba(255,64,96,0.05);
      border-color: var(--danger);
      color: var(--text);
    }
    .box-danger strong { color: var(--danger); }

    code {
      font-family: var(--font-mono); font-size: 0.82rem;
      color: var(--accent2); background: rgba(0,255,157,0.08);
      padding: 0.1rem 0.35rem;
    }

    .divider {
      border: none; border-top: 1px solid var(--border);
      margin: 3rem 0;
    }

    footer {
      position: relative; z-index: 1;
      text-align: center; padding: 1.5rem;
      border-top: 1px solid var(--border);
      font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
    }
    footer a { color: var(--accent); text-decoration: none; }
    footer a:hover { color: var(--accent2); }

    @media (max-width: 640px) {
      main { padding: 2rem 1rem 4rem; }
      .page-header h1 { font-size: 2rem; }
      .manual-section h2 { font-size: 1.5rem; }
      .cmd-table { font-size: 0.78rem; }
      .cmd-table td, .cmd-table th { padding: 0.5rem 0.7rem; }
    }