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

:root {
  --bg:        #f4f5f7;
  --surface:   #ffffff;
  --border:    #e3e6ec;
  --accent:    #1a5fd4;
  --accent-h:  #1450b8;
  --text:      #16191f;
  --text2:     #4b5563;
  --muted:     #8b95a6;
  --tag-bg:    #deeafc;
  --tag-text:  #1a5fd4;
  --radius:    12px;
  --header-h:  56px;
  --header-stack-h: var(--header-h);
  --tab-h:     72px;
  --card-hover:  #f8f9fc;
  --card-active: #eef2fb;
  --detail-body: #2d3142;
  --badge-lang-bg:   #ede9fe;
  --badge-lang-text: #6d28d9;
  --header-shadow:   rgba(0, 0, 0, 0.07);
  --tab-bar-shadow:  rgba(0, 0, 0, 0.07);
  --filter-shadow:   rgba(0, 0, 0, 0.06);
  --chat-bg:           #ebebeb;
  --chat-msg-asst-bg:  #ffffff;
  --chat-msg-asst-text:#1a1a1a;
  --chat-msg-user-bg:  #95ec69;
  --chat-msg-user-text:#1a1a1a;
  --chat-msg-name:     #888888;
  --chat-input-bar-bg: #f5f5f5;
  --chat-input-bar-border: #d9d9d9;
  --chat-input-bg:     #ffffff;
  --chat-input-text:   #1a1a1a;
  --chat-input-focus:  #aaaaaa;
  --chat-send-bg:      #07c160;
  --chat-send-bg-h:    #06ad56;
  --chat-send-disabled:#b2b2b2;
  --chat-avatar-bg:    #c8c8c8;
  --chat-typing-dot:   #bbbbbb;
  --cal-weekend:       #c62828;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg:        #0e1117;
  --surface:   #1a1f2a;
  --border:    #2d3548;
  --accent:    #5b9cff;
  --accent-h:  #3d7eea;
  --text:      #e8eaed;
  --text2:     #b8c0cc;
  --muted:     #8b939e;
  --tag-bg:    #243552;
  --tag-text:  #8ab4ff;
  --card-hover:  #222a38;
  --card-active: #2a3445;
  --detail-body: #c4cad4;
  --badge-lang-bg:   #2f2650;
  --badge-lang-text: #c4b5fd;
  --header-shadow:   rgba(0, 0, 0, 0.45);
  --tab-bar-shadow:  rgba(0, 0, 0, 0.5);
  --filter-shadow:   rgba(0, 0, 0, 0.35);
  --chat-bg:           #12161c;
  --chat-msg-asst-bg:  #252b36;
  --chat-msg-asst-text:#e8eaed;
  --chat-msg-user-bg:  #2f6b42;
  --chat-msg-user-text:#e8eaed;
  --chat-msg-name:     #9aa0a8;
  --chat-input-bar-bg: #1a1f2a;
  --chat-input-bar-border: #3a4558;
  --chat-input-bg:     #252b36;
  --chat-input-text:   #e8eaed;
  --chat-input-focus:  #5b9cff;
  --chat-send-bg:      #0d9c54;
  --chat-send-bg-h:    #0b8648;
  --chat-send-disabled:#4a5568;
  --chat-avatar-bg:    #3a4558;
  --chat-typing-dot:   #6b7280;
  --cal-weekend:       #ff8a80;
  color-scheme: dark;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: calc(var(--tab-h) + env(safe-area-inset-bottom));
}

/* ══════════════════════════════════════════
   HEADER
══════════════════════════════════════════ */
.site-header-wrap {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--surface);
  box-shadow: 0 1px 6px var(--header-shadow);
}
.lang-toggle {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  line-height: 1.2;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); background: var(--tag-bg); }
.lang-toggle:active { opacity: 0.92; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  flex-shrink: 0;
}
.logo img { height: 36px; width: auto; display: block; }
.logo-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.header-search {
  display: none;
  flex: 1;
  max-width: 360px;
  position: relative;
  margin-left: 0.5rem;
}
.header-search input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.75rem 0.45rem 2.1rem;
  font-size: 0.875rem;
  color: var(--text);
  outline: none;
}
.header-search input:focus { border-color: var(--accent); }
.header-search .si { position: absolute; left: 0.65rem; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 0.9rem; pointer-events: none; }

#back-btn {
  display: none;
  align-items: center;
  gap: 0.35rem;
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 8px;
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
#back-btn:hover { border-color: var(--accent); color: var(--accent); }
#back-btn.visible { display: flex; }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 36px;
  padding: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.15s, background 0.15s;
}
.theme-toggle:hover { border-color: var(--accent); background: var(--tag-bg); }

#filter-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  margin-left: auto;
}
#filter-toggle.active { border-color: var(--accent); color: var(--accent); background: var(--tag-bg); }

.header-controls {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* ══════════════════════════════════════════
   FILTER BAR (mobile panel)
══════════════════════════════════════════ */
#filter-bar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
  display: none;
  flex-direction: column;
  gap: 0.6rem;
  position: sticky;
  top: var(--header-stack-h);
  z-index: 190;
  box-shadow: 0 2px 8px var(--filter-shadow);
}
#filter-bar.open { display: flex; }

.filter-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }
.filter-row-full { grid-template-columns: 1fr; }

.filter-search { position: relative; }
.filter-search input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem 0.5rem 2rem;
  font-size: 0.875rem;
  color: var(--text);
  outline: none;
}
.filter-search input:focus { border-color: var(--accent); }
.filter-search .si { position: absolute; left: 0.65rem; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 0.85rem; pointer-events: none; }

select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.5rem 1.8rem 0.5rem 0.6rem;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b95a6' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
}
select:focus { border-color: var(--accent); }

#filter-toggle.hidden,
#filter-bar.hidden-detail { display: none !important; }
.header-controls.hidden,
.header-search.hidden { display: none !important; }

/* ══════════════════════════════════════════
   BOTTOM TAB BAR
══════════════════════════════════════════ */
#tab-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: calc(var(--tab-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: stretch;
  z-index: 300;
  box-shadow: 0 -1px 8px var(--tab-bar-shadow);
  transition: transform 0.22s ease, opacity 0.2s ease;
}
/* 聊天输入框聚焦、软键盘弹出时暂藏底栏，避免与输入区抢纵向空间（iOS 第三方键盘尤甚） */
body.chat-keyboard-open #tab-bar {
  transform: translateY(110%);
  opacity: 0;
  pointer-events: none;
}
body.chat-keyboard-open {
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.22rem;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.78rem;
  cursor: pointer;
  transition: color 0.15s;
  padding: 0.45rem 0.25rem;
  min-width: 0;
}
/* 图标区统一高度，避免头像列与 emoji 列上下不齐 */
.tab-btn .tab-icon {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 1.45rem;
  line-height: 1;
}
.tab-btn .tab-avatar {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  overflow: hidden;
  font-size: 0;
}
.tab-btn .tab-avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.tab-label {
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.tab-btn.active { color: var(--accent); }

/* ══════════════════════════════════════════
   MAIN LAYOUT
══════════════════════════════════════════ */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem;
}

.page { display: none; }
.page.active { display: block; }

#status {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 1.4em;
}

/* ══════════════════════════════════════════
   NEWS CARDS
══════════════════════════════════════════ */
#news-list { display: flex; flex-direction: column; }

.card {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  display: flex;
  gap: 0.85rem;
  cursor: pointer;
  transition: background 0.12s;
  align-items: flex-start;
}
.card:first-child { border-top: 1px solid var(--border); border-radius: var(--radius) var(--radius) 0 0; }
.card:last-child  { border-radius: 0 0 var(--radius) var(--radius); }
.card:only-child  { border-radius: var(--radius); }
.card:hover  { background: var(--card-hover); }
.card:active { background: var(--card-active); }

.card-thumb {
  width: 76px; height: 56px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--border);
}
.card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.card-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 0.3rem; }

.card-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card:hover .card-title { color: var(--accent); }

.card-snippet {
  font-size: 0.8rem;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.card-footer {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.1rem;
}

.badge {
  font-size: 0.68rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 500;
  white-space: nowrap;
}
.badge-source { background: var(--tag-bg); color: var(--tag-text); }
.badge-lang   { background: var(--badge-lang-bg); color: var(--badge-lang-text); }
.badge-date   { color: var(--muted); font-size: 0.68rem; }

/* ── Pagination ── */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}
.page-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  font-size: 0.83rem;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
  min-height: 38px;
  min-width: 38px;
}
.page-btn:hover { background: var(--tag-bg); border-color: var(--accent); color: var(--accent); }
.page-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.page-btn:disabled { opacity: 0.3; cursor: default; }

/* ══════════════════════════════════════════
   DETAIL VIEW
══════════════════════════════════════════ */
#detail-view { display: none; }
#detail-view.visible { display: block; }

.detail-wrap {
  max-width: 720px;
  margin: 0 auto;
}

.detail-kicker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}
.detail-kicker .badge { font-size: 0.72rem; }

.detail-title {
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1.28;
  color: var(--text);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.detail-hero {
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
  display: block;
  margin-bottom: 1.1rem;
  background: var(--border);
}

.detail-byline {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--muted);
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--text);
  margin-bottom: 1.25rem;
}
.detail-byline .sep { color: var(--border); }
.detail-byline a { color: var(--accent); text-decoration: none; font-weight: 500; }
.detail-byline a:hover { text-decoration: underline; }

.detail-body {
  font-size: 1rem;
  line-height: 1.95;
  color: var(--detail-body);
  word-break: break-word;
  white-space: pre-wrap;
}

.detail-body-loading {
  color: var(--muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 2rem 0;
}

.detail-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.detail-gallery img {
  width: 100%;
  max-height: 280px;
  border-radius: 10px;
  object-fit: cover;
  display: block;
}

.detail-source-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 2rem;
  padding: 0.7rem 1.4rem;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}
.detail-source-btn:hover { background: var(--accent-h); }

.detail-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.detail-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background 0.15s, color 0.15s;
}
.detail-btn-primary { background: var(--accent); color: #fff; }
.detail-btn-primary:hover { background: var(--accent-h); }
.detail-btn-outline { background: none; border: 1.5px solid var(--border); color: var(--text2); }
.detail-btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }

@media (min-width: 700px) {
  .detail-title { font-size: 1.95rem; }
  .detail-hero  { max-height: 420px; }
  .detail-body  { font-size: 1.05rem; }
  .detail-gallery { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
  .detail-gallery img { max-height: 220px; }
}

/* ══════════════════════════════════════════
   CHAT PAGE — 微信风格
══════════════════════════════════════════ */
#page-chat {
  display: none;
  position: fixed;
  top: var(--header-stack-h);
  left: 0; right: 0;
  /* 默认高度（无 JS / 桌面）；移动端键盘弹出时由 app.js 按可视区域重写 height/top */
  bottom: calc(var(--tab-h) + env(safe-area-inset-bottom));
  height: auto;
  flex-direction: column;
  background: var(--chat-bg);
  z-index: 50;
  overflow: hidden;
}
/* 键盘弹出时聊天层盖住原底栏区域，避免输入条仍被底栏压住 */
body.chat-keyboard-open #page-chat.active {
  z-index: 320;
}
#page-chat.active { display: flex; }

#page-chat-wrap {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
  overflow: hidden;
}

#chat-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 12px 12px 4px;
  display: flex;
  flex-direction: column;
  gap: 0;
  touch-action: pan-y;
}

.msg {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-bottom: 14px;
  max-width: 100%;
}
.msg.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 40px; height: 40px;
  border-radius: 6px;
  flex-shrink: 0;
  overflow: hidden;
  background: var(--chat-avatar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}
.msg-avatar img { width: 100%; height: 100%; object-fit: cover; }

.msg-content {
  display: flex;
  flex-direction: column;
  gap: 3px;
  max-width: calc(100% - 56px);
}
.msg.user .msg-content { align-items: flex-end; }

.msg-name {
  font-size: 0.72rem;
  color: var(--chat-msg-name);
  padding: 0 4px;
}

.msg-bubble {
  position: relative;
  padding: 9px 12px;
  border-radius: 4px;
  font-size: 0.95rem;
  line-height: 1.6;
  word-break: break-word;
  white-space: pre-wrap;
  max-width: 100%;
}

.msg.asst .msg-bubble {
  background: var(--chat-msg-asst-bg);
  color: var(--chat-msg-asst-text);
  border-radius: 0 8px 8px 8px;
  box-shadow: 0 1px 2px var(--header-shadow);
}
.msg.asst .msg-bubble::before {
  content: "";
  position: absolute;
  left: -6px; top: 10px;
  border: 6px solid transparent;
  border-right-color: var(--chat-msg-asst-bg);
  border-left: 0;
  filter: drop-shadow(-1px 0 1px var(--header-shadow));
}

.msg.user .msg-bubble {
  background: var(--chat-msg-user-bg);
  color: var(--chat-msg-user-text);
  border-radius: 8px 0 8px 8px;
  box-shadow: 0 1px 2px var(--header-shadow);
}
.msg.user .msg-bubble::after {
  content: "";
  position: absolute;
  right: -6px; top: 10px;
  border: 6px solid transparent;
  border-left-color: var(--chat-msg-user-bg);
  border-right: 0;
}

.msg-bubble.thinking {
  min-width: 48px;
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.msg-bubble.thinking::after {
  content: "";
  display: block;
  width: 36px; height: 8px;
  background: radial-gradient(circle, var(--chat-typing-dot) 2px, transparent 2px) 0/12px 8px,
              radial-gradient(circle, var(--chat-typing-dot) 2px, transparent 2px) 14px/12px 8px,
              radial-gradient(circle, var(--chat-typing-dot) 2px, transparent 2px) 28px/12px 8px;
  animation: typing 1s infinite;
}
@keyframes typing {
  0%,100% { opacity: 0.3; }
  33%  { opacity: 1; }
}

#chat-input-bar {
  flex-shrink: 0;
  background: var(--chat-input-bar-bg);
  border-top: 1px solid var(--chat-input-bar-border);
  padding: 8px 12px;
  padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#chat-input {
  flex: 1;
  background: var(--chat-input-bg);
  border: 1px solid var(--chat-input-bar-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 1rem;
  color: var(--chat-input-text);
  outline: none;
  resize: none;
  max-height: 100px;
  line-height: 1.5;
  font-family: inherit;
  -webkit-appearance: none;
}
#chat-input:focus { border-color: var(--chat-input-focus); }

#chat-send {
  height: 36px;
  padding: 0 14px;
  border-radius: 6px;
  background: var(--chat-send-bg);
  border: none;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s;
  white-space: nowrap;
}
#chat-send:active  { background: var(--chat-send-bg-h); }
#chat-send:disabled { background: var(--chat-send-disabled); cursor: default; }

/* ══════════════════════════════════════════
   CALENDAR PAGE
══════════════════════════════════════════ */
#page-calendar {
  display: none;
  position: fixed;
  top: var(--header-stack-h);
  left: 0; right: 0;
  bottom: calc(var(--tab-h) + env(safe-area-inset-bottom));
  background: var(--bg);
  z-index: 50;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
#page-calendar.active { display: block; }

.calendar-wrap {
  max-width: 420px;
  margin: 0 auto;
  padding: 1rem 1rem 1.5rem;
}

.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.cal-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
  text-align: center;
}

.cal-nav-btn {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1.65rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 3px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.cal-nav-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--tag-bg); }
.cal-nav-btn:active { opacity: 0.92; }

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}

.cal-cell {
  aspect-ratio: 1;
  max-height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
}

.cal-day {
  background: var(--surface);
  border: 1px solid var(--border);
}

.cal-day.cal-today {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 700;
}

.calendar-weekdays .cal-weekend-label {
  color: var(--cal-weekend);
}

.cal-day.cal-weekend:not(.cal-today) {
  color: var(--cal-weekend);
}

.cal-pad {
  visibility: hidden;
  pointer-events: none;
}

/* ══════════════════════════════════════════
   EMPTY / LOADING
══════════════════════════════════════════ */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 4rem 1rem;
  font-size: 0.9rem;
}
.spinner {
  display: inline-block;
  width: 1.1rem; height: 1.1rem;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════
   DESKTOP
══════════════════════════════════════════ */
@media (min-width: 700px) {
  :root { --header-h: 60px; --tab-h: 80px; }

  /* Web：新闻列表 / 聊天 / 日历（底栏随文档流）不占 viewport 底部留白 */
  body:not(.article-detail-open):not(.tab-bar-overlay),
  body.tab-bar-overlay:not(.article-detail-open) {
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  #app-shell {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - var(--header-stack-h));
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
  }

  header { padding: 0 1.75rem; gap: 1rem; }
  .logo img { height: 44px; }

  .header-search  { display: flex; }
  .header-controls { display: flex; }
  #filter-toggle  { display: none; }
  #filter-bar     { display: none !important; }

  main { padding: 1.5rem 2rem; }

  .card { padding: 1.1rem 1.25rem; gap: 1rem; }
  .card-thumb { width: 96px; height: 70px; }

  .detail-title { font-size: 1.5rem; }
  .detail-body  { padding: 1.75rem 2rem; }
  .detail-images { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
  .detail-images img { max-height: 300px; }

  /* 新闻列表：Tab 紧跟分页，随主内容宽度；详情 / 聊天 / 日历仍贴底 */
  body:not(.article-detail-open):not(.tab-bar-overlay) #main-news #tab-bar {
    position: static;
    margin-top: 1.25rem;
    margin-left: auto;
    margin-right: auto;
    left: auto;
    right: auto;
    transform: none;
    width: 100%;
    max-width: 860px;
    height: auto;
    min-height: var(--tab-h);
    padding-bottom: 0.65rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 1px 8px var(--tab-bar-shadow);
  }
  /* 读文章：底栏仍贴视口底 */
  body.article-detail-open #tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    margin-top: 0;
    margin-left: auto;
    margin-right: auto;
    max-width: 860px;
    transform: none;
    border-radius: var(--radius) var(--radius) 0 0;
    border: 1px solid var(--border);
    border-bottom: none;
    box-shadow: 0 -1px 8px var(--tab-bar-shadow);
    height: calc(var(--tab-h) + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
  }
  /* 桌面：聊天/日历与新闻列表一致，Tab 在内容区下方（非视口最底） */
  body.tab-bar-overlay #tab-bar {
    position: static;
    margin-top: 1.25rem;
    margin-left: auto;
    margin-right: auto;
    left: auto;
    right: auto;
    transform: none;
    width: 100%;
    max-width: 860px;
    height: auto;
    min-height: var(--tab-h);
    padding-bottom: 0.65rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 1px 8px var(--tab-bar-shadow);
  }
  body.tab-bar-overlay #page-chat {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    height: auto;
    max-height: none;
  }
  body.tab-bar-overlay #page-calendar {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    height: auto;
    max-height: none;
  }
  body.tab-bar-overlay #page-calendar.active {
    display: flex;
    flex-direction: column;
  }
  body.tab-bar-overlay #page-calendar .calendar-wrap {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }

  .calendar-wrap { max-width: 480px; padding: 1.5rem 2rem 2rem; }
  .cal-title { font-size: 1.2rem; }
  .cal-cell { max-height: 58px; font-size: 0.92rem; }

  .tab-btn { font-size: 0.85rem; gap: 0.28rem; padding: 0.5rem 0.35rem; }
  .tab-btn .tab-icon { font-size: 1.6rem; width: 36px; height: 36px; }
  .tab-btn .tab-avatar { width: 36px; height: 36px; border-radius: 8px; }

  .header-controls select {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 8px;
    padding: 0.42rem 1.6rem 0.42rem 0.6rem;
    font-size: 0.83rem;
    outline: none;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b95a6' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    width: auto;
  }
  .header-controls select:focus { border-color: var(--accent); }

  #page-chat-wrap { padding: 0 2rem; }
}