:root {
      --bg: #eaf4fb;
      --card: #ffffff;
      --text: #1a1f26;
      --muted: #5c6773;
      --border: #e2e6ea;
      --accent: #c8102e;
    }

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

    body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.5;
      min-height: 100vh;
    }

    .page {
      max-width: 960px;
      margin: 0 auto;
      padding: 48px 24px 64px;
    }

    h1 {
      font-size: clamp(2.4rem, 6vw, 3.75rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      margin-bottom: 12px;
    }

    h1 span {
      color: var(--accent);
    }

    .identity {
      font-size: 1rem;
      color: var(--muted);
      margin-bottom: 16px;
    }

    .identity strong {
      color: var(--text);
      font-weight: 600;
    }

    .intro {
      font-size: 1.05rem;
      color: var(--muted);
      max-width: 42em;
      margin-bottom: 40px;
    }

    .cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 18px;
      min-height: 180px;
      padding: 20px;
      box-shadow: 0 8px 24px rgba(30, 64, 110, 0.08);
    }

    .card h2 {
      font-size: 1.05rem;
      font-weight: 600;
      letter-spacing: 0.01em;
      margin-bottom: 12px;
    }

    .weather-status {
      font-size: 0.9rem;
      color: var(--muted);
    }

    .weather-main {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .weather-main img {
      width: 56px;
      height: 56px;
    }

    .weather-temp {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
    }

    .weather-condition {
      font-size: 0.9rem;
      color: var(--muted);
    }

    .weather-meta {
      display: grid;
      gap: 6px;
      font-size: 0.9rem;
      color: var(--muted);
    }

    .weather-meta span {
      color: var(--text);
      font-weight: 600;
    }

    .weather-warning {
      margin-top: 12px;
      font-size: 0.8rem;
      color: #8a3b12;
      background: #fff4e8;
      border-radius: 8px;
      padding: 8px 10px;
    }

    .weather-updated {
      margin-top: 12px;
      font-size: 0.75rem;
      color: var(--muted);
    }

    .air-status {
      font-size: 0.9rem;
      color: var(--muted);
    }

    .air-station {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .air-aqhi {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
    }

    .air-risk {
      font-size: 0.9rem;
      color: var(--text);
      margin-top: 2px;
    }

    .transport-status {
      font-size: 0.9rem;
      color: var(--muted);
    }

    .transport-line {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .transport-dest {
      font-size: 0.9rem;
      color: var(--text);
      margin-bottom: 8px;
    }

    .transport-next {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
    }

    .field-label {
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.03em;
      color: var(--muted);
      margin-right: 4px;
    }

    footer {
      max-width: 960px;
      margin: 0 auto;
      padding: 0 24px 48px;
      font-size: 0.85rem;
      color: var(--muted);
    }

    .refresh-timer {
      position: fixed;
      left: 16px;
      bottom: 16px;
      width: 64px;
      height: 64px;
      z-index: 20;
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 50%;
      box-shadow: 0 8px 24px rgba(30, 64, 110, 0.12);
    }

    .refresh-ring {
      width: 64px;
      height: 64px;
      transform: rotate(-90deg);
    }

    .refresh-ring-track,
    .refresh-ring-progress {
      fill: none;
      stroke-width: 2.5;
    }

    .refresh-ring-track {
      stroke: #d5dde6;
    }

    .refresh-ring-progress {
      stroke: var(--accent);
      stroke-linecap: round;
    }

    .refresh-count {
      position: absolute;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text);
    }

    @media (max-width: 700px) {
      .cards {
        grid-template-columns: 1fr;
      }

      .page {
        padding-bottom: 96px;
      }
    }