:root {
      --dark-bg: #121217;
      --dark-bg-light: #1f1f29;
      --btn-primary: #efefef;
      --btn-primary-hover: #16f78e;
      --btn-secondary: #efefef;
      --btn-secondary-hover: #16f78e;
      --btn-tertiary: #efefef;
      --btn-tertiary-hover: #16f78e;
      --text-light: #4bfaa3;
      --text-muted: #fafcfb;
      --shadow-glow: rgba(12, 245, 116, 0.5);
      --shadow-glow-secondary: rgba(255, 113, 91, 0.4);
      --shadow-glow-tertiary: rgba(255, 204, 0, 0.4);
    }

    /* 全局背景和字体 */
    body {
      font-family: 'Inter', system-ui, sans-serif;
      background: var(--dark-bg);
      color: var(--text-light);
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      margin: 0;
      line-height: 1.5;
      padding: 1rem;
    }

    .container {
      text-align: center;
      background: var(--dark-bg-light);
      padding: 1.5rem 2rem;
      border-radius: 12px;
      box-shadow:
        0 0 15px var(--shadow-glow),
        0 10px 20px rgba(0,0,0,0.5);
      max-width: 480px;
      width: 100%;
      user-select: none;
    }

    .security-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: #0cf574;
      color: #121217;
      padding: 0.4rem 1rem;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      box-shadow: 0 0 8px var(--shadow-glow);
      user-select: text;
    }

    .security-badge svg {
      width: 1rem;
      height: 1rem;
    }

    .logo img {
      width: 48px;
      height: 48px;
      display: inline-block;
      margin: 0 auto 1rem auto;
      filter: drop-shadow(0 0 3px var(--btn-primary));
      border-radius: 8px;
    }

    h1 {
      margin: 0 0 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-light);
    }

    p, h4, .notice {
      color: var(--text-muted);
      margin: 0.5rem 0 0.5rem 0;
      font-weight: 400;
    }

    h4 {
      color: #0cf574;
      font-weight: 600;
      margin-top: 1rem;
    }

    .btn-group {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
      margin-top: 1.5rem;
    }

    /* 统一按钮大小，稍微小点，且自适应宽度 */
    .btn {
      padding: 0.6rem 0;
      border-radius: 10px;
      font-weight: 700;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      font-size: 1.2rem;
      font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
      letter-spacing: 0.3px;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      max-width: 100%;
      box-shadow: 0 0 8px transparent;
      user-select: none;
    }

    /* 绿色主按钮 */
    .btn-primary {
      background-color: var(--btn-primary);
      color: var(--dark-bg);
      box-shadow: 0 0 10px var(--shadow-glow);
    }

    .btn-primary:hover:not(:disabled) {
      background-color: var(--btn-primary-hover);
      box-shadow: 0 0 15px var(--shadow-glow);
      transform: translateY(-2px);
    }

    /* 橙色备用按钮 */
    .btn-secondary {
      background-color: var(--btn-secondary);
      color: var(--dark-bg);
      box-shadow: 0 0 8px var(--shadow-glow-secondary);
    }

    .btn-secondary:hover:not(:disabled) {
      background-color: var(--btn-secondary-hover);
      box-shadow: 0 0 12px var(--shadow-glow-secondary);
      transform: translateY(-2px);
    }

    /* 黄色备用按钮 */
    .btn-tertiary {
      background-color: var(--btn-tertiary);
      color: var(--dark-bg);
      box-shadow: 0 0 8px var(--shadow-glow-tertiary);
    }

    .btn-tertiary:hover:not(:disabled) {
      background-color: var(--btn-tertiary-hover);
      box-shadow: 0 0 12px var(--shadow-glow-tertiary);
      transform: translateY(-2px);
    }

    /* 加载动画 */
    .loader {
      display: none;
      width: 1rem;
      height: 1rem;
      border: 2px solid rgba(0,0,0,0.2);
      border-radius: 50%;
      border-top-color: var(--dark-bg);
      animation: spin 1s linear infinite;
      margin-left: 0.5rem;
    }

    .btn:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      box-shadow: none !important;
      transform: none !important;
    }

    .btn.disabled {
      pointer-events: none;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    /* 链接按钮去掉下划线，继承颜色 */
    a.btn {
      text-decoration: none;
      display: inline-flex;
    }

    /* 响应式，手机下稍微留白 */
    @media (max-width: 480px) {
      .container {
        padding: 1rem 1.2rem;
      }
      .btn {
        font-size: 0.9rem;
        padding: 0.55rem 0;
      }
    }