/* 潮闻 app 共用外壳：底栏、登录门、内容结束标记 */
    body {
      background: #15202b;
      color: #e7e9ea;
      font-family: var(--font-body);
      min-height: 100vh;
      padding-bottom: 4.8rem;
    }

    .social-header {
      background: #1e2d3d;
      padding: 0.75rem 1rem;
      display: flex;
      align-items: center;
      gap: 0.75rem;
      border-bottom: 1px solid #38444d;
      position: sticky;
      top: 0;
      z-index: 10;
    }

    .social-header .back {
      color: #e7e9ea;
      font-size: 0.85rem;
      cursor: pointer;
      text-decoration: none;
      white-space: nowrap;
    }
    .social-header .back:hover { color: #1d9bf0; }

    .social-header .profile-name {
      font-weight: 700;
      font-size: 1rem;
    }

    .social-header .post-count {
      font-size: 0.75rem;
      color: #8899a6;
      margin-left: auto;
    }

    /* ---------- 登录门 ---------- */
    #login-gate {
      position: fixed;
      inset: 0;
      z-index: 999;
      background: #0a0c0f;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 1.5rem;
    }

    #login-gate.hidden { display: none; }

    .login-card {
      width: 100%;
      max-width: 340px;
      background: #15202b;
      border: 1px solid #2f3e4e;
      border-radius: 6px;
      padding: 1.75rem 1.5rem 1.25rem;
    }

    .login-brand {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      letter-spacing: 0.2em;
      color: #8899a6;
    }

    .login-title {
      font-size: 0.95rem;
      color: #ffffff;
      margin: 0.5rem 0 1.4rem;
    }

    .login-field { margin-bottom: 0.85rem; }

    .login-field label {
      display: block;
      font-size: 0.7rem;
      color: #8899a6;
      margin-bottom: 0.3rem;
    }

    .login-field input {
      width: 100%;
      box-sizing: border-box;
      background: #1b2733;
      border: 1px solid #2f3e4e;
      border-radius: 4px;
      color: #ffffff;
      padding: 0.55rem 0.6rem;
      font-size: 0.85rem;
      font-family: inherit;
    }

    .login-field input:focus { outline: none; border-color: #1d9bf0; }

    .login-btn {
      width: 100%;
      margin-top: 0.4rem;
      padding: 0.6rem;
      background: #1d9bf0;
      border: none;
      border-radius: 20px;
      color: #ffffff;
      font-size: 0.85rem;
      font-family: inherit;
      cursor: pointer;
    }

    .login-btn:hover { background: #1a91da; }

    .login-err {
      min-height: 1.1rem;
      margin-top: 0.7rem;
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: #f4212e;
    }

    .login-hint {
      display: none;
      margin-top: 0.4rem;
      font-size: 0.7rem;
      line-height: 1.6;
      color: #8899a6;
    }

    .login-hint.show { display: block; }

    .login-foot {
      margin-top: 1.2rem;
      padding-top: 0.8rem;
      border-top: 1px solid #2f3e4e;
      font-family: var(--font-mono);
      font-size: 0.65rem;
      color: #5b7083;
    }

    .feed-end,
    .dm-end {
      padding: 1.75rem 1rem 2rem;
      text-align: center;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      letter-spacing: 0.06em;
      color: #4a5a6a;
    }

    /* ---------- 潮闻 app 底部标签栏 ---------- */
    .app-nav {
      position: fixed;
      left: 0; right: 0; bottom: 0;
      z-index: 500;
      display: flex;
      background: #1e2d3d;
      border-top: 1px solid #38444d;
      padding: 0.25rem 0.75rem calc(0.25rem + env(safe-area-inset-bottom));
    }

    .app-nav .app-tab {
      flex: 1 1 0;
      min-width: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.15rem;
      padding: 0.45rem 0 0.35rem;
      color: #8899a6;
      font-size: 0.62rem;
      letter-spacing: 0.02em;
      text-decoration: none;
      cursor: pointer;
      user-select: none;
    }

    .app-nav .app-tab .i {
      font-size: 1.15rem;
      line-height: 1;
      filter: grayscale(1) opacity(0.6);
    }

    .app-nav .app-tab.active { color: #1d9bf0; }
    .app-nav .app-tab.active .i { filter: none; }
    .app-nav .app-tab:active { background: rgba(29, 155, 240, 0.08); }

    .login-back {
      display: block;
      margin-top: 0.9rem;
      text-align: center;
      font-size: 0.72rem;
      color: #8899a6;
      text-decoration: none;
    }

    .login-back:hover { color: #1d9bf0; }