/* Global scroll & tap highlight */
    html {
      scroll-behavior: smooth;
      -webkit-tap-highlight-color: transparent;
    }

    :root {
      --bg: #f9f9f9;
      --text: #111;
      --card: #fff;
      --border: #ccc;
      --accent: #007bff;
    }

    [data-theme="dark"] {
      --bg: #1e1e1e;
      --text: #f5f5f5;
      --card: #2a2a2a;
      --border: #444;
      --accent: #4da3ff;
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      font-family: sans-serif;
      background: var(--bg);
      color: var(--text);
      padding: 1rem;
      transition: background-color 0.4s ease, color 0.4s ease;
    }

    .container {
      max-width: 900px;
      margin: auto;
    }

    /* HEADER */
    header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1rem;
    }

    header h1 {
      margin: 0;
      font-weight: 700;
      font-size: 1.8rem;
    }

    /* Theme Switch */
    .theme-toggle {
      user-select: none;
      cursor: pointer;
      font-weight: bold;
      display: flex;
      align-items: center;
      gap: 0.3rem;
      font-family: monospace;
      -webkit-tap-highlight-color: transparent;
      transition: background-color 0.25s ease, color 0.25s ease;
    }

    .theme-switch {
      position: relative;
      width: 48px;
      height: 24px;
      background: var(--border);
      border-radius: 12px;
      cursor: pointer;
      display: flex;
      align-items: center;
      padding: 0 4px;
      box-sizing: border-box;
      -webkit-tap-highlight-color: transparent;
      transition: background-color 0.25s ease;
    }

    .theme-switch-circle {
      position: absolute;
      top: 2px;
      width: 20px;
      height: 20px;
      background: var(--card);
      border-radius: 50%;
      transition: left 0.3s ease, background-color 0.3s ease;
      box-shadow: 0 0 4px rgba(0,0,0,0.3);
    }

    [data-theme="light"] .theme-switch-circle {
      left: 4px;
    }

    [data-theme="dark"] .theme-switch-circle {
      left: 24px;
    }

    /* Text next to switch */
    .theme-labels {
      display: flex;
      gap: 6px;
      font-size: 0.9rem;
      -webkit-tap-highlight-color: transparent;
    }

    .theme-label {
      color: var(--text);
      user-select: none;
      transition: opacity 0.3s ease;
    }

    .theme-label.light {
      opacity: 1;
    }

    .theme-label.dark {
      opacity: 0.5;
    }

    [data-theme="dark"] .theme-label.light {
      opacity: 0.5;
    }

    [data-theme="dark"] .theme-label.dark {
      opacity: 1;
    }

    /* Tabs container - horizontal scroll with snap */
    .tabs {
      display: flex;
      gap: 1rem;
      margin-bottom: 1rem;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      /* scrollbar-width: thin; */
      scrollbar-width: none;
      scrollbar-color: var(--accent) transparent;
    }

    .tabs::-webkit-scrollbar {
      height: 6px;
    }
    .tabs::-webkit-scrollbar-track {
      background: transparent;
    }
    .tabs::-webkit-scrollbar-thumb {
      background-color: var(--accent);
      border-radius: 3px;
    }

    .tab {
      flex: 0 0 auto;
      cursor: pointer;
      padding: 0.5rem 1rem;
      border-bottom: 3px solid transparent;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: border-color 0.3s ease, font-weight 0.3s ease;
      scroll-snap-align: start;
      white-space: nowrap;
      border-radius: 4px 4px 0 0;
    }

    .tab.active {
      border-color: var(--accent);
      font-weight: bold;
      background-color: var(--card);
    }
    
    /* API Container */
    #api-list {
      overflow: auto;
      max-height: 450px;
      scrollbar-width: none;
    }

    /* API Card */
    .api-card {
      background: var(--card);
      border-radius: 10px;
      padding: 1rem;
      margin-bottom: 1rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      border: 1px solid var(--border);
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    .api-card button {
      background: var(--accent);
      color: white;
      border: none;
      padding: 0.5rem 1rem;
      border-radius: 6px;
      cursor: pointer;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: background-color 0.25s ease;
    }

    .api-card button:focus,
    .api-card button:active {
      outline: none;
      background-color: #0056b3;
    }

    /* Playground Card */
    .playground-card {
      background: var(--card);
      border-radius: 10px;
      padding: 2rem;
      margin-top: 1rem;
      box-shadow: 0 0 20px rgba(0,0,0,0.1);
      position: relative;
      animation: slideIn 0.3s ease-out;
      display: flex;
      flex-direction: column;
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    @keyframes slideIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @keyframes slideOut {
      from { opacity: 1; transform: translateY(0); }
      to { opacity: 0; transform: translateY(20px); }
    }

    /* Close Button */
    .close-btn {
      position: absolute;
      top: 12px;
      right: 12px;
      width: 32px;
      height: 32px;
      background: #ff4d4f;
      color: white;
      border: none;
      border-radius: 6px;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: background-color 0.25s ease;
    }

    .close-btn:focus,
    .close-btn:active {
      outline: none;
      background-color: #d9363e;
    }

    input, textarea {
      width: 100%;
      padding: 0.75rem;
      margin-top: 0.5rem;
      margin-bottom: 1rem;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: var(--bg);
      color: var(--text);
      font-family: monospace;
      font-size: 1rem;
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    textarea {
      min-height: 100px;
      resize: vertical;
    }

    /* Playground Footer with centered Send Request */
    .playground-footer {
      display: flex;
      justify-content: center;
      margin-top: 1rem;
      width: 100%;
    }

    .playground-footer button {
      background: var(--accent);
      color: white;
      border: none;
      padding: 0.6rem 1.5rem;
      border-radius: 6px;
      cursor: pointer;
      width: 100%;
      max-width: 360px;
      font-weight: 600;
      font-size: 1rem;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      transition: background-color 0.2s ease;
    }

    .playground-footer button:hover,
    .playground-footer button:focus,
    .playground-footer button:active {
      background: #0056b3;
      outline: none;
    }

    /* Response box */
    .response {
      background: #222;
      color: #0f0;
      white-space: pre-wrap;
      font-family: monospace;
      border-radius: 6px;
      padding: 1rem;
      overflow: auto;
      max-height: 300px;
      margin-top: 1rem;
      border: 1px solid #333;
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    /* Tabs fade + slide animation */
    #api-list-tab,
    #docs-tab,
    #apikey-tab,
    #contact-tab {
      opacity: 1;
      transform: translateY(0);
      transition: opacity 0.3s ease, transform 0.3s ease;
      height: auto;
      pointer-events: auto;
    }

    .hidden {
      opacity: 0;
      transform: translateY(20px);
      pointer-events: none;
      height: 0 !important;
      overflow: hidden;
      transition: opacity 0.3s ease, transform 0.3s ease, height 0.3s ease;
    }

    /* Responsive */
    @media (max-width: 600px) {
      .container {
        padding: 0 0.5rem;
      }
      header h1 {
        font-size: 1.4rem;
      }
      .playground-card {
        padding: 1rem;
      }
      input, textarea {
        font-size: 0.9rem;
      }
      .playground-footer button {
        max-width: 100%;
      }
    }