:root {
      --bg: #0f172a;
      --card: #111827;
      --text: #e5e7eb;
      --muted: #9ca3af;
      --accent: #22c55e;
      --accent-pressed: #16a34a;
      --ring: rgba(34, 197, 94, 0.35);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      min-height: 100vh;
      display: grid;
      place-items: center;
      background: radial-gradient(1200px 800px at 70% -20%, #1f2937 0%, #0b1020 40%, var(--bg) 65%);
      color: var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
      padding: 24px;
    }

    .wrap {
      width: 100%;
      max-width: 520px;
      background: linear-gradient(145deg, #0f172a, #0b1226);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 16px;
      padding: 28px 24px 32px;
      box-shadow:
        0 10px 30px rgba(0,0,0,0.35),
        inset 0 1px 0 rgba(255,255,255,0.05);
    }

    .title {
      font-size: 20px;
      line-height: 1.4;
      text-align: center;
      color: var(--text);
      margin: 0 0 22px;
    }

    .hint {
      text-align: center;
      color: var(--muted);
      font-size: 14px;
      margin-bottom: 18px;
    }

    .center {
      display: grid;
      place-items: center;
      gap: 16px;
    }

    .circle-btn {
      appearance: none;
      cursor: pointer;
      width: 140px;
      height: 140px;
      border-radius: 50%;
      border: 0;
      background: radial-gradient(80% 80% at 30% 20%, #2dd46e 0%, #22c55e 40%, #16a34a 100%);
      color: white;
      font-size: 16px;
      font-weight: 700;
      letter-spacing: 0.4px;
      box-shadow:
        0 10px 20px rgba(34,197,94,0.35),
        inset 0 -6px 14px rgba(0,0,0,0.25);
      transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
      outline: none;
    }
    .circle-btn:active {
      transform: translateY(1px) scale(0.995);
      box-shadow:
        0 6px 14px rgba(34,197,94,0.30),
        inset 0 -4px 10px rgba(0,0,0,0.30);
      filter: brightness(0.98);
      background: radial-gradient(80% 80% at 30% 20%, #26bd61 0%, #1fb454 40%, #12833a 100%);
    }
    .circle-btn:focus-visible {
      box-shadow:
        0 10px 20px rgba(34,197,94,0.35),
        0 0 0 6px var(--ring),
        inset 0 -6px 14px rgba(0,0,0,0.25);
    }

    .num {
      font-size: 48px;
      line-height: 1;
      font-weight: 800;
      letter-spacing: 0.5px;
      margin-top: 4px;
      color: #f8fafc;
      text-shadow: 0 2px 10px rgba(0,0,0,0.35);
      min-height: 1em;
    }

    .discount {
      margin-top: 8px;
      font-size: 16px;
      color: var(--muted);
    }

    .row {
      margin-top: 18px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      align-items: center;
      justify-items: center;
    }
    .pill {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.08);
      padding: 10px 14px;
      border-radius: 999px;
      font-size: 14px;
      color: var(--text);
      min-width: 140px;
      text-align: center;
    }
    .label {
      color: var(--muted);
      font-size: 12px;
      margin-bottom: 6px;
      text-transform: uppercase;
      letter-spacing: 0.12em;
    }

    @media (max-width: 420px) {
      .circle-btn { width: 120px; height: 120px; font-size: 15px; }
      .num { font-size: 40px; }
      .row { grid-template-columns: 1fr; gap: 10px; }
      .pill { width: 100%; }
    }