:root {
      color-scheme: light;
      --paper: #f3f0e8;
      --panel: #fffdf7;
      --ink: #14213d;
      --on-ink: #ffffff;
      --text: #1f2937;
      --muted: #6b7280;
      --line: #d8d4ca;
      --lime: #c7f000;
      --blue: #5a7dff;
      --note-accent: #c7f000;
      --danger: #d95252;
      --shadow: 0 8px 0 rgba(20, 33, 61, .08);
    }

    [data-theme="dark"] {
      color-scheme: dark;
      --paper: #101624;
      --panel: #182033;
      --ink: #f4f6fb;
      --on-ink: #101624;
      --text: #eef1f7;
      --muted: #aab3c4;
      --line: #36415a;
      --lime: #c7f000;
      --blue: #8ca4ff;
      --note-accent: #3556d8;
      --danger: #ff8a8a;
      --shadow: 0 8px 0 rgba(0, 0, 0, .22);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--text);
      font-family: Inter, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
      transition: background .2s, color .2s;
    }

    button, input, textarea, select { font: inherit; }
    button { cursor: pointer; }
    button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
      outline: 3px solid color-mix(in srgb, var(--blue), transparent 50%);
      outline-offset: 2px;
    }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      display: grid;
      grid-template-columns: auto minmax(240px, 620px) auto;
      align-items: center;
      gap: 24px;
      min-height: 84px;
      padding: 10px clamp(18px, 4vw, 64px);
      color: white;
      background: #14213d;
      border-bottom: 4px solid var(--lime);
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 900;
      letter-spacing: -.04em;
      white-space: nowrap;
    }

    .implement-lockup {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .company-label {
      color: var(--lime);
      font-size: 11px;
      font-weight: 900;
      letter-spacing: .12em;
      writing-mode: vertical-rl;
    }

    .implement-logo-frame {
      position: relative;
      display: block;
      width: 64px;
      height: 64px;
      overflow: hidden;
      background: white;
      border-radius: 5px;
      border: 2px solid rgba(255, 255, 255, .7);
    }

    .implement-logo-frame img {
      position: absolute;
      top: -58px;
      left: -63px;
      display: block;
      width: 190px;
      max-width: none;
      height: auto;
    }

    .brand-divider {
      display: block;
      width: 1px;
      height: 46px;
      background: #52617d;
    }

    .brand-name {
      display: block;
      max-width: 5em;
      font-size: 15px;
      line-height: 1.25;
      white-space: normal;
    }

    .search-wrap { position: relative; }
    .search-wrap::before {
      position: absolute;
      top: 50%;
      left: 15px;
      content: "⌕";
      color: #8e9ab1;
      font-size: 24px;
      transform: translateY(-54%);
    }

    .search {
      width: 100%;
      height: 46px;
      padding: 0 16px 0 46px;
      color: #f7f8fc;
      background: #253451;
      border: 1px solid #425170;
      border-radius: 8px;
    }

    .search::placeholder { color: #aeb8cb; }
    .theme-button {
      width: 44px;
      height: 44px;
      color: white;
      background: transparent;
      border: 1px solid #52617d;
      border-radius: 8px;
      font-size: 18px;
    }

    .shell {
      width: min(1380px, calc(100% - 36px));
      margin: 0 auto;
      padding: 46px 0 70px;
    }

    .hero {
      display: grid;
      grid-template-columns: minmax(0, 1.5fr) minmax(280px, .7fr);
      gap: 28px;
      align-items: end;
      margin-bottom: 34px;
    }

    .eyebrow {
      margin: 0 0 10px;
      color: var(--blue);
      font-size: 13px;
      font-weight: 900;
      letter-spacing: .16em;
      text-transform: uppercase;
    }

    h1 {
      max-width: 780px;
      margin: 0;
      color: var(--ink);
      font-size: clamp(42px, 6vw, 82px);
      line-height: .98;
      letter-spacing: -.07em;
    }

    .hero-copy {
      max-width: 620px;
      margin: 18px 0 0;
      color: var(--muted);
      font-size: clamp(16px, 2vw, 20px);
      line-height: 1.65;
    }

    .hero-note {
      padding: 22px;
      background: var(--ink);
      color: var(--paper);
      border-left: 8px solid var(--note-accent);
      box-shadow: var(--shadow);
    }

    .hero-note strong {
      display: block;
      margin-bottom: 6px;
      color: var(--note-accent);
      font-size: 32px;
    }

    .hero-note span { color: color-mix(in srgb, var(--paper), transparent 22%); }

    .filters {
      display: flex;
      gap: 8px;
      margin-bottom: 24px;
      overflow-x: auto;
      padding-bottom: 5px;
      scrollbar-width: thin;
    }

    .filter {
      flex: 0 0 auto;
      padding: 9px 15px;
      color: var(--muted);
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 999px;
      font-weight: 800;
    }

    .filter.active {
      color: var(--on-ink);
      background: var(--ink);
      border-color: var(--ink);
    }

    .tool-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .tool-card {
      min-width: 0;
      padding: 22px;
      background: var(--panel);
      border: 1px solid var(--line);
      border-top: 5px solid var(--ink);
      box-shadow: var(--shadow);
      transition: transform .18s, border-color .18s;
    }

    .tool-card:hover { transform: translateY(-3px); }
    .tool-card.hidden { display: none; }
    .tool-card.favorite { border-top-color: var(--lime); }

    .tool-head {
      display: grid;
      grid-template-columns: 44px 1fr auto;
      gap: 12px;
      align-items: start;
      margin-bottom: 18px;
    }

    .tool-code {
      display: grid;
      width: 44px;
      height: 44px;
      place-items: center;
      color: var(--tool-logo-text, white);
      background: var(--tool-logo, #14213d);
      border: 2px solid color-mix(in srgb, var(--tool-logo, #14213d), #000 18%);
      border-radius: 7px;
      box-shadow: 3px 3px 0 color-mix(in srgb, var(--tool-logo, #14213d), #000 24%);
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: 14px;
      font-weight: 900;
      transition: transform .18s, box-shadow .18s;
    }

    .tool-card:hover .tool-code {
      box-shadow: 1px 1px 0 color-mix(in srgb, var(--tool-logo, #14213d), #000 24%);
      transform: translate(2px, 2px);
    }

    .tool-card[data-category~="text"] {
      --tool-logo: #3556d8;
      --tool-logo-text: #fff;
    }

    .tool-card[data-category~="calculate"] {
      --tool-logo: #ff914d;
      --tool-logo-text: #14213d;
    }

    .tool-card[data-category~="life"] {
      --tool-logo: #08795a;
      --tool-logo-text: #fff;
    }

    .tool-card[data-category~="design"] {
      --tool-logo: #a83b86;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="text"] {
      --tool-logo: #3556d8;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="json"] {
      --tool-logo: #c7f000;
      --tool-logo-text: #14213d;
    }

    .tool-card[data-id="base64"] {
      --tool-logo: #ff914d;
      --tool-logo-text: #14213d;
    }

    .tool-card[data-id="password"] {
      --tool-logo: #6846c7;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="percent"] {
      --tool-logo: #ffd166;
      --tool-logo-text: #14213d;
    }

    .tool-card[data-id="unit"] {
      --tool-logo: #08795a;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="date"] {
      --tool-logo: #b93650;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="color"] {
      --tool-logo: #a83b86;
      --tool-logo-text: #fff;
    }

    .tool-card[data-id="timer"] {
      --tool-logo: #176a96;
      --tool-logo-text: #fff;
    }

    .tool-head h2 {
      margin: 0;
      color: var(--ink);
      font-size: 19px;
      letter-spacing: -.03em;
    }

    .tool-head p {
      margin: 4px 0 0;
      color: var(--muted);
      font-size: 13px;
    }

    .favorite-button {
      width: 36px;
      height: 36px;
      color: var(--muted);
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 6px;
      font-size: 19px;
    }

    .favorite .favorite-button {
      color: #14213d;
      background: var(--lime);
      border-color: var(--lime);
    }

    .field, textarea, select {
      width: 100%;
      color: var(--text);
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: 6px;
    }

    .field, select {
      height: 42px;
      padding: 0 12px;
    }

    textarea {
      min-height: 112px;
      padding: 12px;
      resize: vertical;
      line-height: 1.5;
    }

    .row {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      margin-top: 10px;
    }

    .button-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 10px;
    }

    .btn {
      min-height: 38px;
      padding: 8px 13px;
      color: var(--on-ink);
      background: var(--ink);
      border: 1px solid var(--ink);
      border-radius: 6px;
      font-weight: 800;
    }

    .btn.secondary {
      color: var(--ink);
      background: transparent;
      border-color: var(--line);
    }

    .btn.accent {
      color: #14213d;
      background: var(--lime);
      border-color: var(--lime);
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      margin-top: 12px;
    }

    .stat, .result {
      padding: 12px;
      background: color-mix(in srgb, var(--blue), transparent 90%);
      border-left: 3px solid var(--blue);
    }

    .stat strong, .result strong {
      display: block;
      color: var(--ink);
      font-size: 20px;
    }

    .stat span, .result span { color: var(--muted); font-size: 12px; }
    .result { margin-top: 12px; min-height: 60px; overflow-wrap: anywhere; }
    .result-pre {
      max-height: 190px;
      overflow: auto;
      white-space: pre-wrap;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: 12px;
      line-height: 1.55;
    }

    .big-result strong { font-size: 32px; }

    .visual-preview {
      display: grid;
      min-height: 82px;
      margin-top: 14px;
      place-items: center;
      color: #14213d;
      background: #fff;
      border: 1px solid var(--line);
      font-weight: 900;
    }

    .swatches {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      min-height: 92px;
      margin-top: 14px;
      overflow: hidden;
      border: 1px solid var(--line);
    }

    .swatch {
      display: grid;
      min-width: 0;
      padding: 6px 2px;
      place-items: end center;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: 9px;
      font-weight: 900;
    }

    .range-line {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 12px;
      align-items: center;
      margin-top: 12px;
    }

    input[type="range"] { width: 100%; accent-color: var(--blue); }
    .checks { display: flex; flex-wrap: wrap; gap: 10px 14px; margin-top: 12px; }
    .checks label { color: var(--muted); font-size: 13px; }
    .checks input { accent-color: var(--blue); }

    .color-line {
      display: grid;
      grid-template-columns: 60px 1fr;
      gap: 10px;
    }

    input[type="color"] {
      width: 60px;
      height: 42px;
      padding: 3px;
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: 6px;
    }

    .timer {
      margin: 10px 0 6px;
      color: var(--ink);
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: clamp(35px, 5vw, 50px);
      font-weight: 900;
      letter-spacing: -.05em;
    }

    .empty {
      display: none;
      padding: 46px;
      color: var(--muted);
      text-align: center;
      border: 1px dashed var(--line);
    }

    footer {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      margin-top: 40px;
      padding-top: 20px;
      color: var(--muted);
      border-top: 1px solid var(--line);
      font-size: 13px;
    }

    .toast {
      position: fixed;
      right: 22px;
      bottom: 22px;
      z-index: 30;
      padding: 12px 16px;
      color: white;
      background: #14213d;
      border-left: 5px solid var(--lime);
      box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
      transform: translateY(80px);
      opacity: 0;
      transition: .22s;
    }

    .toast.show { transform: translateY(0); opacity: 1; }

    @media (max-width: 1050px) {
      .tool-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .hero { grid-template-columns: 1fr; }
      .hero-note { max-width: 520px; }
    }

    @media (max-width: 680px) {
      .topbar { grid-template-columns: 1fr auto; gap: 12px; }
      .search-wrap { grid-column: 1 / -1; grid-row: 2; }
      .implement-logo-frame { width: 56px; height: 56px; }
      .implement-logo-frame img { top: -51px; left: -55px; width: 166px; }
      .brand-divider { height: 40px; }
      .shell { width: min(100% - 24px, 1380px); padding-top: 30px; }
      .tool-grid { grid-template-columns: 1fr; }
      .tool-card { padding: 18px; }
      h1 { font-size: 48px; }
      footer { flex-direction: column; }
    }