/* ===========================================
       โทเคนของธีม ใช้ชุดเดียวกับชุดสไลด์ Taxonomy Grid
       เพื่อให้กิจกรรมเปิดกับสไลด์เป็นงานชิ้นเดียวกัน
       =========================================== */
    :root {
      --paper: #f6f4ec;
      --ink: #14203c;
      --cobalt: #1F49C7;
      --red: #E8555A;
      --green: #1E9E6A;
      --amber: #C77E00;
      --muted: #5a6377;
      --card: #ffffff;

      --cobalt-deep: #17389a;
      --red-deep: #b0272e;
      --green-deep: #146f4b;
      --amber-deep: #8f5a00;

      --grid-line: rgba(31, 73, 199, 0.07);
      --grid-line-major: rgba(31, 73, 199, 0.16);

      --font-display: 'Bai Jamjuree', sans-serif;
      --font-body: 'IBM Plex Sans Thai', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;

      --shadow-hard: 6px 6px 0 rgba(20, 32, 60, 0.18);
      --shadow-hard-sm: 4px 4px 0 rgba(20, 32, 60, 0.16);
      --ease: cubic-bezier(0.16, 1, 0.3, 1);

      --icon-sm: 18px;
      --icon-md: 22px;
      --tap: 44px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      font-size: 17px;
      line-height: 1.65;
      color: var(--ink);
      background-color: var(--paper);
      /* ลายเซ็นทางสายตาของงานชุดนี้ คือกระดาษกราฟ */
      background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
        linear-gradient(var(--grid-line-major) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line-major) 1px, transparent 1px);
      background-size: 24px 24px, 24px 24px, 120px 120px, 120px 120px;
      -webkit-text-size-adjust: 100%;
    }

    h1,
    h2,
    h3 {
      font-family: var(--font-display);
      font-weight: 700;
      line-height: 1.25;
      margin: 0 0 12px;
    }

    p {
      margin: 0 0 14px;
    }

    a {
      color: var(--cobalt-deep);
    }

    :focus-visible {
      outline: 3px solid var(--amber);
      outline-offset: 3px;
    }

    @media (prefers-reduced-motion: reduce) {

      *,
      *::before,
      *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
      }
    }

    .skip-link {
      position: absolute;
      left: -9999px;
      top: 0;
      background: var(--ink);
      color: var(--paper);
      padding: 12px 20px;
      z-index: 9999;
      font-weight: 600;
    }

    .skip-link:focus {
      left: 8px;
      top: 8px;
    }

    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0 0 0 0);
      white-space: nowrap;
      border: 0;
    }

    /* ── แถบบนสุด ── */
    .topbar {
      position: sticky;
      top: 0;
      z-index: 80;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 16px;
      background: rgba(246, 244, 236, .95);
      backdrop-filter: blur(6px);
      border-bottom: 2.5px solid var(--ink);
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      min-width: 0;
    }

    .brand-mark {
      width: 30px;
      height: 30px;
      flex: 0 0 auto;
      border: 2.5px solid var(--ink);
      background: var(--card);
      display: grid;
      place-items: center;
    }

    .brand-mark svg {
      width: 18px;
      height: 18px;
    }

    .brand-text {
      min-width: 0;
    }

    .brand-title {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 15px;
      line-height: 1.2;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .brand-sub {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--muted);
      letter-spacing: .04em;
    }

    .topbar-spacer {
      flex: 1;
    }

    .icon-btn {
      width: var(--tap);
      height: var(--tap);
      display: grid;
      place-items: center;
      border: 2.5px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      cursor: pointer;
      flex: 0 0 auto;
      transition: background .16s var(--ease);
    }

    .icon-btn svg {
      width: var(--icon-md);
      height: var(--icon-md);
    }

    .icon-btn:hover {
      background: rgba(31, 73, 199, .10);
    }

    .icon-btn.on {
      background: var(--ink);
      color: var(--paper);
    }

    /* ── แถบความคืบหน้า ── */
    .progress {
      display: flex;
      gap: 6px;
      padding: 10px 16px 0;
      max-width: 760px;
      margin: 0 auto;
    }

    .progress-step {
      flex: 1;
      height: 8px;
      background: var(--card);
      border: 2px solid var(--ink);
    }

    .progress-step.done {
      background: var(--cobalt);
    }

    .progress-step.now {
      background: var(--amber);
    }

    /* ── สถานี ── */
    main {
      max-width: 760px;
      margin: 0 auto;
      padding: 18px 16px 120px;
    }

    .station {
      display: none;
      animation: fadeUp .45s var(--ease) both;
    }

    .station.active {
      display: block;
    }

    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(14px);
      }

      to {
        opacity: 1;
        transform: none;
      }
    }

    .kicker {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-mono);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .14em;
      color: var(--cobalt-deep);
      border: 2.5px solid var(--cobalt);
      background: var(--card);
      padding: 6px 14px;
      box-shadow: var(--shadow-hard-sm);
      margin-bottom: 16px;
    }

    .kicker .dot {
      width: 9px;
      height: 9px;
      background: var(--cobalt);
      flex: 0 0 auto;
    }

    .kicker.green {
      color: var(--green-deep);
      border-color: var(--green);
    }

    .kicker.green .dot {
      background: var(--green);
    }

    .kicker.amber {
      color: var(--amber-deep);
      border-color: var(--amber);
    }

    .kicker.amber .dot {
      background: var(--amber);
    }

    h1 {
      font-size: clamp(28px, 7vw, 40px);
    }

    h2.st-title {
      font-size: clamp(24px, 6vw, 33px);
      margin-bottom: 14px;
    }

    .accent {
      color: var(--cobalt-deep);
    }

    .lede {
      font-size: clamp(16px, 4vw, 19px);
      color: var(--muted);
      line-height: 1.7;
    }

    .card {
      background: var(--card);
      border: 2.5px solid var(--ink);
      box-shadow: var(--shadow-hard);
      padding: 18px;
      margin-bottom: 18px;
    }

    .card h3 {
      font-size: 20px;
      color: var(--cobalt-deep);
    }

    .callout {
      background: var(--card);
      border: 2.5px solid var(--ink);
      border-left: 10px solid var(--amber);
      box-shadow: var(--shadow-hard-sm);
      padding: 14px 16px;
      margin-bottom: 18px;
      font-size: 16px;
    }

    .callout b {
      color: var(--amber-deep);
    }

    .callout.green {
      border-left-color: var(--green);
    }

    .callout.green b {
      color: var(--green-deep);
    }

    .note {
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--muted);
      line-height: 1.6;
    }

    /* ── ปุ่ม ── */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: var(--tap);
      font-family: var(--font-display);
      font-size: 18px;
      font-weight: 600;
      padding: 10px 22px;
      border: 2.5px solid var(--ink);
      background: var(--cobalt);
      color: #fff;
      cursor: pointer;
      box-shadow: var(--shadow-hard-sm);
      transition: transform .14s var(--ease), box-shadow .14s var(--ease);
    }

    .btn:hover:not(:disabled) {
      transform: translate(2px, 2px);
      box-shadow: 2px 2px 0 rgba(20, 32, 60, 0.16);
    }

    .btn:disabled {
      opacity: .45;
      cursor: not-allowed;
    }

    .btn.ghost {
      background: var(--card);
      color: var(--ink);
    }

    .btn.green {
      background: var(--green-deep);
    }

    .btn svg {
      width: var(--icon-sm);
      height: var(--icon-sm);
      flex: 0 0 auto;
    }

    .btn-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 6px;
    }

    /* ── ช่องกรอก ── */
    label.field-label {
      display: block;
      font-family: var(--font-display);
      font-weight: 600;
      font-size: 17px;
      margin-bottom: 8px;
    }

    textarea.field {
      width: 100%;
      min-height: 120px;
      font-family: var(--font-body);
      font-size: 17px;
      line-height: 1.6;
      padding: 12px 14px;
      border: 2.5px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      resize: vertical;
    }

    textarea.field:read-only {
      background: #f2f1ea;
      color: var(--muted);
    }

    .counter {
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--muted);
      text-align: right;
      margin-top: 6px;
    }

    .counter.warn {
      color: var(--red-deep);
      font-weight: 700;
    }

    /* ── ตัวเลือกแบบแตะ ── */
    .choice {
      display: block;
      width: 100%;
      text-align: left;
      font-family: var(--font-body);
      font-size: 17px;
      line-height: 1.55;
      padding: 14px 16px;
      margin-bottom: 10px;
      border: 2.5px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      cursor: pointer;
      box-shadow: var(--shadow-hard-sm);
      min-height: var(--tap);
    }

    .choice b {
      font-family: var(--font-display);
      display: block;
      margin-bottom: 2px;
    }

    .choice.picked {
      background: rgba(31, 73, 199, .12);
      border-color: var(--cobalt-deep);
    }

    .choice.picked b {
      color: var(--cobalt-deep);
    }

    /* ── ตัวจับเวลา ── */
    .timer {
      display: flex;
      align-items: center;
      gap: 12px;
      font-family: var(--font-mono);
      font-weight: 700;
      margin-bottom: 14px;
    }

    .timer-num {
      font-size: 30px;
      letter-spacing: .04em;
      border: 2.5px solid var(--ink);
      background: var(--card);
      padding: 2px 14px;
      box-shadow: var(--shadow-hard-sm);
      min-width: 104px;
      text-align: center;
    }

    .timer-num.low {
      background: rgba(232, 85, 90, .16);
      color: var(--red-deep);
    }

    .timer-label {
      font-size: 13px;
      color: var(--muted);
      letter-spacing: .06em;
    }

    /* ── พื้นที่วาด ── */
    .draw-wrap {
      border: 2.5px solid var(--ink);
      background: #fff;
      box-shadow: var(--shadow-hard);
      margin-bottom: 12px;
      position: relative;
      overflow: hidden;
    }

    #padCanvas {
      display: block;
      width: 100%;
      height: auto;
      touch-action: none;
      cursor: crosshair;
      background:
        linear-gradient(rgba(31, 73, 199, .06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(31, 73, 199, .06) 1px, transparent 1px);
      background-size: 20px 20px;
    }

    .tools {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 16px;
    }

    .tool {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      min-height: var(--tap);
      font-family: var(--font-mono);
      font-size: 14px;
      font-weight: 700;
      padding: 8px 14px;
      border: 2.5px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      cursor: pointer;
      box-shadow: var(--shadow-hard-sm);
    }

    .tool svg {
      width: var(--icon-sm);
      height: var(--icon-sm);
    }

    .tool.on {
      background: var(--ink);
      color: var(--paper);
    }

    /* ── กล่องผลลัพธ์ของ AI ── */
    .ai-out {
      border: 2.5px solid var(--ink);
      border-left: 10px solid var(--green);
      background: var(--card);
      box-shadow: var(--shadow-hard-sm);
      padding: 16px;
      font-size: 16px;
      line-height: 1.65;
      max-height: 46vh;
      overflow-y: auto;
    }

    .ai-out .ai-head {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 18px;
      color: var(--green-deep);
      margin-bottom: 8px;
    }

    .ai-out ul {
      margin: 6px 0 12px;
      padding-left: 22px;
    }

    .ai-out li {
      margin-bottom: 5px;
    }

    .ai-out .idle {
      color: var(--muted);
      text-align: center;
      display: block;
      padding: 14px 0;
    }

    .ai-out .err {
      color: var(--red-deep);
      font-weight: 600;
    }

    .spinner {
      display: inline-block;
      width: 15px;
      height: 15px;
      border: 2.5px solid rgba(255, 255, 255, .35);
      border-top-color: #fff;
      border-radius: 50%;
      animation: spin .7s linear infinite;
      vertical-align: -2px;
    }

    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }

    /* ── ตารางนิยามจากวรรณกรรม ── */
    .deflist {
      border: 2.5px solid var(--ink);
      background: var(--card);
      box-shadow: var(--shadow-hard);
      margin-bottom: 18px;
    }

    .defrow {
      padding: 13px 16px;
      border-bottom: 2px solid rgba(20, 32, 60, .16);
      font-size: 16px;
      line-height: 1.6;
    }

    .defrow:last-child {
      border-bottom: 0;
    }

    .defrow b {
      font-family: var(--font-display);
      color: var(--cobalt-deep);
      display: block;
      margin-bottom: 2px;
    }

    /* ── แผงผู้นำเสนอ ── */
    .presenter {
      display: none;
      position: fixed;
      inset: auto 0 0 0;
      z-index: 90;
      background: var(--ink);
      color: var(--paper);
      border-top: 3px solid var(--amber);
      padding: 14px 16px calc(14px + env(safe-area-inset-bottom));
      max-height: 62vh;
      overflow-y: auto;
    }

    .presenter.show {
      display: block;
    }

    .presenter h3 {
      color: var(--amber);
      font-size: 17px;
      margin-bottom: 8px;
      letter-spacing: .02em;
    }

    .presenter .script {
      background: rgba(255, 255, 255, .07);
      border-left: 5px solid var(--amber);
      padding: 12px 14px;
      font-size: 17px;
      line-height: 1.75;
      margin-bottom: 12px;
    }

    .presenter .script em {
      display: block;
      font-style: normal;
      font-family: var(--font-mono);
      font-size: 12px;
      color: #c9cfdd;
      margin-top: 8px;
      letter-spacing: .04em;
    }

    .presenter .p-nav {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .p-btn {
      min-height: 40px;
      font-family: var(--font-mono);
      font-size: 13px;
      font-weight: 700;
      padding: 7px 12px;
      border: 2px solid var(--paper);
      background: transparent;
      color: var(--paper);
      cursor: pointer;
    }

    .p-btn.on {
      background: var(--amber);
      border-color: var(--amber);
      color: var(--ink);
    }

    .presenter .p-close {
      position: absolute;
      top: 8px;
      right: 10px;
      width: 38px;
      height: 38px;
      background: transparent;
      border: 2px solid var(--paper);
      color: var(--paper);
      font-size: 20px;
      cursor: pointer;
      line-height: 1;
    }

    /* ── หน้าต่างตั้งค่ากุญแจ API ── */
    .setup-overlay,
    .api-modal-overlay {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 9000;
      background: rgba(20, 32, 60, .72);
      backdrop-filter: blur(4px);
      align-items: center;
      justify-content: center;
      padding: 18px;
    }

    .setup-overlay.show,
    .api-modal-overlay.show {
      display: flex;
    }

    .setup-card,
    .api-modal-box {
      background: var(--card);
      border: 3px solid var(--ink);
      box-shadow: 10px 10px 0 rgba(20, 32, 60, .25);
      padding: 24px;
      width: 100%;
      max-width: 520px;
      max-height: 88vh;
      overflow-y: auto;
    }

    .setup-card h2,
    .api-modal-box h2 {
      font-size: 22px;
      margin-bottom: 10px;
    }

    .api-field {
      margin-bottom: 14px;
    }

    .api-field label {
      display: block;
      font-family: var(--font-display);
      font-weight: 600;
      font-size: 15px;
      margin-bottom: 6px;
    }

    .api-field input,
    .api-field select {
      width: 100%;
      min-height: var(--tap);
      font-family: var(--font-mono);
      font-size: 15px;
      padding: 9px 12px;
      border: 2.5px solid var(--ink);
      background: var(--card);
      color: var(--ink);
    }

    .preset-btn {
      min-height: 38px;
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 700;
      padding: 6px 11px;
      margin: 0 6px 6px 0;
      border: 2px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      cursor: pointer;
    }

    .api-save-btn {
      width: 100%;
      min-height: var(--tap);
      font-family: var(--font-display);
      font-size: 17px;
      font-weight: 600;
      padding: 11px;
      border: 2.5px solid var(--ink);
      background: var(--cobalt);
      color: #fff;
      cursor: pointer;
      box-shadow: var(--shadow-hard-sm);
    }

    .api-status {
      display: none;
      margin-top: 10px;
      padding: 9px 12px;
      font-size: 14px;
      border: 2px solid var(--ink);
    }

    .api-status.show {
      display: block;
    }

    .api-status.ok {
      background: rgba(30, 158, 106, .14);
      color: var(--green-deep);
    }

    .api-status.err {
      background: rgba(232, 85, 90, .14);
      color: var(--red-deep);
    }

    .api-modal-close {
      float: right;
      width: 38px;
      height: 38px;
      border: 2px solid var(--ink);
      background: var(--card);
      color: var(--ink);
      font-size: 20px;
      line-height: 1;
      cursor: pointer;
    }

    @media (min-width: 700px) {
      body {
        font-size: 18px;
      }

      main {
        padding-top: 26px;
      }
    }