:root {
      --ink: #18212f;
      --muted: #5f6f85;
      --line: #dce3ed;
      --paper: #fbfcf8;
      --panel: #ffffff;
      --blue: #246bfe;
      --green: #16845d;
      --amber: #b76b00;
      --rose: #b23a5c;
      --shadow: 0 18px 48px rgba(30, 41, 59, 0.11);
      color-scheme: light;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
      line-height: 1.75;
    }

    img {
      display: block;
      max-width: 100%;
    }

    a {
      color: inherit;
    }

    .skip-link {
      position: absolute;
      left: 16px;
      top: -48px;
      z-index: 10;
      padding: 10px 14px;
      color: #fff;
      background: var(--ink);
      border-radius: 8px;
      transition: top 0.2s ease;
    }

    .skip-link:focus {
      top: 16px;
    }

    .hero {
      padding: 74px 0 52px;
      background:
        linear-gradient(180deg, rgba(246, 250, 248, 0.92), rgba(251, 252, 248, 0.96)),
        url("https://images.unsplash.com/photo-1456513080510-7bf3a84b82f8?auto=format&fit=crop&w=2200&q=80") center/cover;
    }

    .container {
      width: min(920px, calc(100% - 32px));
      margin: 0 auto;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 210px;
      gap: 42px;
      align-items: center;
    }

    h1,
    h2,
    h3 {
      margin: 0;
      line-height: 1.2;
      letter-spacing: 0;
    }

    h1 {
      max-width: 760px;
      font-size: clamp(2.55rem, 6vw, 4.5rem);
    }

    .lead {
      max-width: 720px;
      margin: 22px 0 0;
      color: #314057;
      font-size: 1.16rem;
    }

    .hero-phone {
      overflow: hidden;
      width: 210px;
      aspect-ratio: 9 / 18.8;
      border: 9px solid #111827;
      border-radius: 34px;
      background: #f8fafc;
      box-shadow: var(--shadow);
    }

    .phone-screen {
      height: 100%;
      padding: 18px 15px;
      background: linear-gradient(180deg, #f9fbff, #edf7f3);
    }

    .app-row {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
    }

    .app-row img {
      width: 46px;
      height: 46px;
      border-radius: 10px;
    }

    .app-title {
      font-weight: 900;
    }

    .app-subtitle {
      color: var(--muted);
      font-size: 0.82rem;
      line-height: 1.35;
    }

    .sample-pill,
    .sample-answer {
      border: 1px solid #dce5ef;
      border-radius: 8px;
      background: #fff;
      padding: 10px 11px;
      font-weight: 800;
    }

    .quiz-sample {
      display: grid;
      gap: 9px;
      margin-top: 16px;
    }

    .sample-answer.correct {
      border-color: rgba(22, 132, 93, 0.38);
      color: var(--green);
      background: #ecf9f3;
    }

    .progress-strip {
      height: 9px;
      margin-top: 22px;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--blue) 72%, #d9e1ea 72%);
    }

    .timer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-top: 13px;
      color: var(--muted);
      font-size: 0.88rem;
    }

    .article {
      padding: 58px 0;
    }

    .intro-note {
      margin: 0 0 30px;
      color: var(--muted);
      font-size: 1.02rem;
    }

    .app-list {
      display: grid;
      gap: 22px;
      counter-reset: apps;
    }

    .app-section {
      position: relative;
      display: grid;
      grid-template-columns: 72px minmax(0, 1fr);
      gap: 18px;
      padding: 24px;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: var(--panel);
      box-shadow: 0 10px 26px rgba(30, 41, 59, 0.07);
      counter-increment: apps;
    }

    .app-icon,
    .app-number {
      width: 72px;
      height: 72px;
      border-radius: 16px;
      flex: 0 0 auto;
    }

    .app-number {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      background: var(--blue);
      font-size: 1.35rem;
      font-weight: 900;
    }

    .app-number::before {
      content: counter(apps);
    }

    .app-section h2 {
      font-size: clamp(1.55rem, 4vw, 2.25rem);
    }

    .app-section p {
      margin: 12px 0 0;
      color: #405168;
    }

    .meta-line {
      margin-top: 12px;
      color: var(--muted);
      font-size: 0.94rem;
    }

    .store-download {
      display: inline-flex;
      padding: 12px;
      margin-top: 12px;
    }

    .store-download img {
      height: 48px;
      width: auto;
      border-radius: 0;
    }

    .store-download:focus-visible {
      outline: 3px solid #225ee8;
      outline-offset: 3px;
    }

    .legal-credit {
      padding-bottom: 24px;
      color: var(--muted);
      font-size: 0.75rem;
    }

    .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tag {
      display: inline-flex;
      min-height: 30px;
      align-items: center;
      padding: 4px 9px;
      border: 1px solid #dbe5ee;
      border-radius: 999px;
      color: #34445c;
      background: #f8fafc;
      font-size: 0.85rem;
      font-weight: 800;
    }

    .highlight {
      padding: 56px 0;
      background: #eef6f3;
    }

    .highlight h2 {
      max-width: 780px;
      font-size: clamp(2rem, 5vw, 3.1rem);
    }

    .highlight-lead {
      max-width: 760px;
      margin: 18px 0 0;
      color: #405168;
      font-size: 1.08rem;
    }

    .benefits {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      margin-top: 28px;
    }

    .benefit {
      min-height: 130px;
      padding: 18px;
      border-left: 4px solid var(--green);
      border-radius: 8px;
      background: #fff;
      box-shadow: 0 8px 22px rgba(30, 41, 59, 0.07);
    }

    .benefit strong {
      display: block;
      margin-bottom: 8px;
      font-size: 1.05rem;
    }

    .benefit span {
      color: var(--muted);
    }

    .closing {
      padding: 42px 0 52px;
      background: #152033;
      color: #fff;
    }

    .closing p {
      max-width: 780px;
      margin: 0;
      color: #d6e0ee;
      font-size: 1.05rem;
    }

    @media (max-width: 820px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }

      .hero-phone {
        width: 190px;
      }

      .benefits {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 560px) {
      .hero {
        padding: 46px 0 34px;
      }

      h1 {
        font-size: clamp(2.25rem, 12vw, 3.2rem);
      }

      .lead {
        font-size: 1.02rem;
      }

      .article {
        padding: 38px 0;
      }

      .app-section {
        grid-template-columns: 1fr;
        padding: 20px;
      }

      .app-icon,
      .app-number {
        width: 60px;
        height: 60px;
        border-radius: 14px;
      }

      .hero-phone {
        display: none;
      }
    }