:root {
      --primary: #38bdf8;
      --primary-dark: #0ea5e9;
      --success: #10b981;
      --danger: #ef4444;
      --light-bg: #f8fafc;
      --card-bg: #ffffff;
      --radius: 16px;
      --shadow: 0 8px 30px rgba(0,0,0,0.06);
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
      background: var(--light-bg);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 20px 10px;
    }

    .container {
      max-width: 680px;
      width: 100%;
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 30px 24px;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    h1 {
      font-size: 24px;
      color: #1e293b;
      text-align: center;
      margin-bottom: 6px;
    }

    .btn-group {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-bottom: 14px;
      flex-wrap: wrap;
    }

    button {
      padding: 10px 16px;
      background: var(--primary);
      color: #fff;
      border: none;
      border-radius: 10px;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
    }

    button:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .copy-btn {
      background: var(--success);
    }

    .copy-btn:hover {
      background: #059669;
    }

    input[type="datetime-local"],
    input[type="number"] {
      width: 100%;
      max-width: 280px;
      padding: 10px 14px;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      font-size: 15px;
      outline: none;
      transition: var(--transition);
      display: block;
      margin: 0 auto 14px auto;
      text-align: center;
    }

    input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
    }

    .info {
      text-align: center;
      font-size: 16px;
      font-weight: 500;
      color: #334155;
      margin-bottom: 16px;
    }

    .countdown {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin: 0 auto 20px auto;
      flex-wrap: wrap;
    }

    .time-box {
      background: linear-gradient(135deg, #38bdf8, #0ea5e9);
      color: white;
      padding: 14px 10px;
      border-radius: 12px;
      min-width: 70px;
      text-align: center;
    }

    .number {
      font-size: 22px;
      font-weight: bold;
    }

    .label {
      font-size: 13px;
      margin-top: 4px;
      opacity: 0.9;
    }

    .expired {
      text-align: center;
      color: var(--danger);
      font-weight: bold;
      margin-bottom: 10px;
    }

    .stats-list {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.1rem;
      font-size: 1.1rem;
      color: #e17055;
      font-weight: 500;
      line-height: 1.1;
      background: none;
      border-radius: 0;
      padding: 0;
      margin-top: 0.5rem;
      box-shadow: none;
      font-family: inherit;
      text-shadow: none;
    }
    .stats-list div {
      font-size: 1.1rem;
      color: #e17055;
      font-weight: 500;
      font-family: inherit;
      letter-spacing: 0;
      text-shadow: none;
      margin: 0.1rem 0;
      transition: none;
    }
    .stats-list div:first-child {
      color: #43a047;
      text-shadow: 0 1px 4px #a5d6a7cc;
    }
    .stats-list div:last-child {
      color: #f57c00;
      text-shadow: 0 1px 4px #ffe0b2cc;
    }

    .module-section {
      background: #fafbfc;
      border-radius: 14px;
      padding: 20px;
      text-align: center;
    }

    .module-section h2 {
      font-size: 17px;
      color: #1e293b;
      margin-bottom: 14px;
    }

    .result {
      margin-top: 12px;
      font-weight: 500;
      color: #1e293b;
      line-height: 1.5;
    }

    .back-btn {
      align-self: flex-start;
      padding: 6px 14px;
      background: #e2e8f0;
      border-radius: 8px;
      font-size: 14px;
      color: #334155;
      text-decoration: none;
      margin-bottom: 10px;
    }

    .desc-box {
      background: #f1f5f9;
      border-radius: 12px;
      padding: 18px;
      font-size: 14px;
      color: #475569;
      line-height: 1.6;
    }