@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&display=swap');
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg: #151515;
      --surface: #1c1c1c;
      --surface2: #242424;
      --border: rgba(255,255,255,0.09);
      --text: #fafafa;
      --muted: #6b6b6b;
      --p1: #818cf8;
      --p2: #f472b6;
      --p3: #34d399;
      --p4: #fb923c;
      --p5: #a78bfa;
      --p6: #22d3ee;
      --accent: #e30046;
      --success: #22c55e;
      --error: #f87171;
    }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: 'Space Grotesk', sans-serif;
      min-height: 100vh;
      padding: 0 1.5rem 4rem;
      line-height: 1.5;
    }

    .container { max-width: 1440px; margin: 0 auto; }

    /* ── Navbar ── */
    .navbar {
      display: flex; align-items: center; justify-content: space-between;
      padding: 0.85rem 0; margin-bottom: 2rem;
      border-bottom: 1px solid var(--border);
    }
    .nav-brand {
      font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em;
      color: var(--accent);
    }
    .nav-links { display: flex; gap: 0.25rem; }
    .nav-link {
      color: var(--muted); text-decoration: none; font-size: 0.875rem; font-weight: 700;
      padding: 0.4rem 0.9rem; border-radius: 7px; transition: all 0.15s;
    }
    .nav-link:hover { background: var(--surface2); color: var(--text); }
    .nav-link.active { background: var(--surface2); color: var(--text); }

    #main-panel {
      display: flex;
      gap: 1.25rem;
      align-items: flex-start;
    }
    .panel-col {
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }
    @media (max-width: 600px) {
      #main-panel { flex-direction: column; }
    }

    header { margin-bottom: 2.5rem; }
    h1 {
      font-size: 2.25rem; font-weight: 700; letter-spacing: -0.03em;
      color: var(--text);
      margin-bottom: 0.25rem;
    }
    .subtitle { color: var(--muted); font-size: 0.95rem; }

    .card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: 14px; padding: 1.5rem;
    }
    .card-title {
      font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.08em; color: var(--accent); margin-bottom: 1rem;
    }
    .card-body {
      overflow: hidden;
      transition: max-height 0.3s ease, opacity 0.25s ease;
      max-height: 2000px; opacity: 1;
    }
    .card-body.collapsed { max-height: 0 !important; opacity: 0; pointer-events: none; margin-top: -1rem; }
    .form-group { margin-bottom: 1rem; }
    .form-group:last-child { margin-bottom: 0; }

    label {
      display: block; font-size: 0.78rem; font-weight: 600;
      color: var(--muted); margin-bottom: 0.35rem;
      text-transform: uppercase; letter-spacing: 0.05em;
    }
    input[type="text"], input[type="number"], textarea {
      width: 100%; background: var(--surface2); border: 1px solid var(--border);
      border-radius: 8px; padding: 0.6rem 0.875rem; color: var(--text);
      font-family: inherit; font-size: 0.9375rem; outline: none;
      transition: border-color 0.15s, box-shadow 0.15s;
    }
    input[type="text"]:focus, input[type="number"]:focus, textarea:focus {
      border-color: var(--accent); box-shadow: 0 0 0 3px rgba(227,0,70,0.12);
    }
    textarea { resize: vertical; min-height: 160px; font-family: 'Courier New', monospace; font-size: 0.85rem; line-height: 1.8; }

    .hint { font-size: 0.78rem; color: var(--muted); margin-top: 0.4rem; }
    .hint code { background: var(--surface2); padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.85em; color: var(--accent); }

    .row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
    @media (max-width: 480px) { .row { grid-template-columns: 1fr; } }

    button {
      cursor: pointer; border: none; border-radius: 8px; font-family: inherit;
      font-size: 0.9rem; font-weight: 700; padding: 0.6rem 1.25rem; transition: all 0.15s;
    }
    .btn-primary {
      background: var(--accent); color: #fff;
      padding: 0.7rem 1.75rem; font-size: 0.95rem;
    }
    .btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
    .btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

    .btn-start {
      background: var(--success); color: #052e16;
      padding: 0.8rem 2.25rem; font-size: 1.05rem; letter-spacing: 0.02em;
    }
    .btn-start:hover { opacity: 0.88; transform: translateY(-1px); }
    .btn-start:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

    .btn-ghost {
      background: var(--surface2); color: var(--muted);
      border: 1px solid var(--border); padding: 0.5rem 1rem; font-size: 0.85rem;
    }
    .btn-ghost:hover { color: var(--text); border-color: var(--accent); }

    .btn-skip {
      background: rgba(251,191,36,0.12); color: #fbbf24;
      border: 1px solid rgba(251,191,36,0.35); padding: 0.65rem 1.2rem; font-size: 0.9rem;
    }
    .btn-skip:hover { background: rgba(251,191,36,0.22); }
    .btn-skip:disabled { opacity: 0.35; cursor: not-allowed; }

    .btn-danger {
      background: rgba(248,113,113,0.12); color: var(--error);
      border: 1px solid rgba(248,113,113,0.35); padding: 0.65rem 1.2rem; font-size: 0.9rem;
    }
    .btn-danger:hover { background: rgba(248,113,113,0.22); }
    .btn-danger:disabled { opacity: 0.35; cursor: not-allowed; }

    .error-msg { color: var(--error); font-size: 0.85rem; margin-top: 0.75rem; min-height: 1.25rem; }

    .badge {
      display: inline-flex; align-items: center;
      background: rgba(227,0,70,0.12); color: var(--accent);
      border-radius: 999px; padding: 0.15rem 0.6rem;
      font-size: 0.75rem; font-weight: 700;
    }
    .preview-meta {
      font-size: 0.82rem; color: var(--muted); margin: 0.6rem 0 0.5rem;
      display: none; align-items: center; gap: 0.5rem;
    }
    #preview-list {
      list-style: none; max-height: 180px; overflow-y: auto;
      border: 1px solid var(--border); border-radius: 8px; display: none;
    }
    #preview-list li {
      display: flex; gap: 0.5rem; padding: 0.4rem 0.75rem;
      font-size: 0.82rem; border-bottom: 1px solid var(--border);
      align-items: baseline;
    }
    #preview-list li:last-child { border-bottom: none; }
    .q-num { color: var(--muted); min-width: 1.8rem; flex-shrink: 0; }
    .q-ans { color: var(--success); }

    .player-q-block {
      background: rgba(255,255,255,0.03); border: 1px solid var(--border);
      border-radius: 8px; padding: 0.75rem; margin-bottom: 0.5rem;
    }
    .player-q-label {
      font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.07em; color: var(--muted); margin-bottom: 0.5rem;
    }
    .question-block {
      background: var(--surface2); border: 1px solid var(--border);
      border-radius: 10px; padding: 1rem; margin-bottom: 0.75rem;
    }
    .question-block-header {
      display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem;
    }
    .question-block-label {
      font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.07em; color: var(--accent);
    }
    .btn-remove-q {
      background: none; border: none; color: var(--muted); font-size: 1rem;
      cursor: pointer; padding: 0 0.25rem; line-height: 1;
    }
    .btn-remove-q:hover { color: var(--error); }
    .btn-add-q {
      background: var(--surface2); border: 1px dashed var(--border);
      color: var(--accent); border-radius: 8px; padding: 0.55rem 1rem;
      font-size: 0.88rem; font-weight: 700; cursor: pointer; width: 100%;
      margin-bottom: 0.25rem; transition: all 0.15s;
    }
    .btn-add-q:hover { border-color: var(--accent); background: rgba(227,0,70,0.06); }

    #result-section { display: none; }

    .link-row { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.6rem; }
    .link-row:last-of-type { margin-bottom: 0; }
    .link-tag { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; min-width: 70px; flex-shrink: 0; }
    .tag-p1 { color: var(--p1); } .tag-p2 { color: var(--p2); } .tag-p3 { color: var(--p3); } .tag-p4 { color: var(--p4); } .tag-p5 { color: var(--p5); } .tag-p6 { color: var(--p6); } .tag-prog { color: var(--accent); }
    .link-row input[type="text"] { flex: 1; font-family: 'Courier New', monospace; font-size: 0.78rem; padding: 0.45rem 0.75rem; cursor: text; }
    .copy-btn {
      background: var(--surface2); border: 1px solid var(--border); border-radius: 7px;
      color: var(--muted); font-family: inherit; font-size: 0.78rem; font-weight: 600;
      padding: 0.4rem 0.75rem; cursor: pointer; transition: all 0.15s; white-space: nowrap;
    }
    .copy-btn:hover { color: var(--text); border-color: var(--accent); }
    .copy-btn.copied { color: var(--success); border-color: var(--success); }
    .divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }
    .start-row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
    #start-status { font-size: 0.875rem; color: var(--muted); }
    #start-status.ok { color: var(--success); } #start-status.err { color: var(--error); }
    .mode-section { display: none; }
    .mode-section.active { display: block; }
    .bank-mode-badge {
      font-size: 0.68rem; font-weight: 800; padding: 0.18rem 0.5rem;
      border-radius: 5px; text-transform: uppercase; letter-spacing: 0.06em; flex-shrink: 0;
    }
    .bank-mode-abcd { background: rgba(227,0,70,0.14); color: var(--accent); }
    .bank-mode-freetext { background: rgba(251,191,36,0.14); color: #fbbf24; }
    .bank-pick-row {
      display: flex; align-items: center; gap: 0.6rem;
      padding: 0.55rem 0.75rem; border: 1px solid var(--border); border-radius: 8px;
      margin-bottom: 0.4rem; cursor: default;
    }
    .bank-pick-row:hover { border-color: rgba(227,0,70,0.35); background: var(--surface2); }
    .bank-pick-row-name { flex: 1; font-size: 0.88rem; font-weight: 700; }
    .bank-pick-row-meta { font-size: 0.75rem; color: var(--muted); }

    .abcd-q-block {
      background: var(--surface2); border: 1px solid var(--border);
      border-radius: 10px; padding: 1rem; margin-bottom: 0.75rem;
    }
    .abcd-q-block-header {
      display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem;
    }
    .abcd-q-block-label { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--accent); }
    .abcd-options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin-bottom: 0.75rem; }
    .abcd-opt-row { display: flex; align-items: center; gap: 0.5rem; }
    .abcd-opt-letter { font-size: 0.78rem; font-weight: 800; width: 18px; flex-shrink: 0; }
    .abcd-opt-a { color: #e11d48; } .abcd-opt-b { color: #3b82f6; }
    .abcd-opt-c { color: #f59e0b; } .abcd-opt-d { color: #22c55e; }
    .abcd-opt-row input { flex: 1; }
    .correct-radio-row { display: flex; align-items: center; gap: 0.75rem; margin-top: 0.25rem; }
    .correct-radio-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
    .correct-radio-options { display: flex; gap: 0.6rem; }
    .correct-radio-opt { display: flex; align-items: center; gap: 0.3rem; cursor: pointer; font-size: 0.85rem; font-weight: 700; }
    .correct-radio-opt input[type=radio] { accent-color: var(--accent); width: 14px; height: 14px; }

    /* Auth modal */
    #auth-overlay {
      position: fixed; inset: 0; z-index: 9999;
      background: rgba(15,15,15,0.93); backdrop-filter: blur(6px);
      display: flex; align-items: center; justify-content: center;
    }
    #auth-overlay.hidden { display: none; }
    .auth-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: 16px; padding: 2.25rem 2rem; width: 100%; max-width: 360px;
      box-shadow: 0 24px 48px rgba(0,0,0,0.5);
    }
    .auth-title {
      font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em;
      color: var(--text);
      margin-bottom: 0.35rem;
    }
    .auth-sub { color: var(--muted); font-size: 0.875rem; margin-bottom: 1.5rem; }
    .auth-input-wrap { position: relative; margin-bottom: 1rem; }
    #auth-password {
      width: 100%; background: var(--surface2); border: 1px solid var(--border);
      border-radius: 8px; padding: 0.65rem 2.75rem 0.65rem 0.875rem;
      color: var(--text); font-family: inherit; font-size: 1rem; outline: none;
      transition: border-color 0.15s, box-shadow 0.15s; letter-spacing: 0.1em;
    }
    #auth-password:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(227,0,70,0.12); }
    #auth-toggle {
      position: absolute; right: 0.75rem; top: 50%; transform: translateY(-50%);
      background: none; border: none; color: var(--muted); cursor: pointer; font-size: 1.1rem; padding: 0;
    }
    #auth-toggle:hover { color: var(--text); }
    #auth-btn {
      width: 100%; background: var(--accent);
      color: #fff; border: none; border-radius: 8px; padding: 0.75rem;
      font-family: inherit; font-size: 1rem; font-weight: 700; cursor: pointer;
      transition: opacity 0.15s; margin-bottom: 0.75rem;
    }
    #auth-btn:hover { opacity: 0.88; }
    #auth-btn:disabled { opacity: 0.45; cursor: not-allowed; }
    #auth-error { color: var(--error); font-size: 0.82rem; min-height: 1.1rem; text-align: center; }