:root,
html[data-theme="dark"] {
  --bg: #000000;
  --bg-elevated: #15202b;
  --border: #2f3336;
  --text: #e7e9ea;
  --muted: #8b98a5;
  --accent: #1d9bf0;
  --hover: rgba(255, 255, 255, 0.03);
  --header-bg: rgba(0, 0, 0, 0.85);
  --zh-text: #c8d0d8;
  --chip-active-fg: #fff;
  --max-w: 640px;
  --header-pad: 12px;
  --tweet-size: 0.95rem;
  --ui-size: 0.8rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html[data-theme="light"] {
  --bg: #ffffff;
  --bg-elevated: #f7f9f9;
  --border: #eff3f4;
  --text: #0f1419;
  --muted: #536471;
  --accent: #1d9bf0;
  --hover: rgba(0, 0, 0, 0.03);
  --header-bg: rgba(255, 255, 255, 0.9);
  --zh-text: #3d4a57;
  --chip-active-fg: #fff;
  color-scheme: light;
}

html[data-font="sm"] {
  --tweet-size: 0.875rem;
  --ui-size: 0.75rem;
}

html[data-font="md"] {
  --tweet-size: 0.95rem;
  --ui-size: 0.8rem;
}

html[data-font="lg"] {
  --tweet-size: 1.125rem;
  --ui-size: 0.85rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  font-size: var(--ui-size);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--header-pad) 16px 10px;
}

.profile {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.profile-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.profile-meta {
  min-width: 0;
}

.profile-name-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
}

.profile-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.profile-handle {
  color: var(--muted);
  font-size: 0.9rem;
}

.profile-bio {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.lang-toggle,
.theme-toggle,
.font-toggle {
  display: inline-flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px;
  flex-shrink: 0;
}

.lang-btn,
.chip-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: var(--ui-size);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
  line-height: 1.2;
}

.font-toggle .chip-btn {
  padding: 6px 10px;
  font-weight: 700;
}

.lang-btn:hover,
.chip-btn:hover {
  color: var(--text);
}

.lang-btn.active,
.chip-btn.active {
  background: var(--accent);
  color: var(--chip-active-fg);
  font-weight: 600;
}

.search-wrap {
  flex: 1 1 140px;
  min-width: 120px;
}

#search {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  padding: 8px 14px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
}

#search::placeholder {
  color: var(--muted);
}

#search:focus {
  border-color: var(--accent);
}

#month-jump {
  appearance: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  padding: 8px 28px 8px 12px;
  font-size: var(--ui-size);
  font-family: inherit;
  cursor: pointer;
  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='%238b98a5' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  max-width: 160px;
}

.status-bar {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--muted);
}

.timeline {
  max-width: var(--max-w);
  margin: 0 auto;
}

.post {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}

.post:hover {
  background: var(--hover);
}

.post-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.post-body {
  flex: 1;
  min-width: 0;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.post-name {
  font-weight: 700;
}

.post-handle,
.post-sep,
.post-date {
  color: var(--muted);
}

.post-date {
  text-decoration: none;
}

.post-date:hover {
  text-decoration: underline;
  color: var(--accent);
}

.text-block {
  margin-top: 4px;
}

.text-block + .text-block {
  margin-top: 10px;
}

.tweet-text {
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
  font-size: var(--tweet-size);
  line-height: 1.55;
  margin: 0;
}

.text-zh .tweet-text {
  color: var(--zh-text);
}

.lang-label {
  display: inline-block;
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.mode-en .text-zh,
.mode-zh .text-en {
  display: none;
}

.mode-bilingual .text-zh {
  border-left: 2px solid var(--border);
  padding-left: 10px;
}

.mode-en .lang-label,
.mode-zh .lang-label {
  display: none;
}

.post-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 10px;
  font-size: 0.75rem;
  color: var(--muted);
}

.post-metrics span + span::before {
  content: "·";
  margin: 0 6px;
  opacity: 0.6;
}

.open-x {
  color: var(--accent);
  text-decoration: none;
}

.open-x:hover {
  text-decoration: underline;
}

.sentinel {
  height: 80px;
}

.loading,
.empty {
  text-align: center;
  color: var(--muted);
  padding: 32px 16px;
  font-size: 0.9rem;
}

.hidden {
  display: none !important;
}

@media (max-width: 520px) {
  .profile-avatar {
    width: 40px;
    height: 40px;
  }

  .post-avatar {
    width: 36px;
    height: 36px;
  }

  .lang-btn,
  .chip-btn {
    padding: 6px 9px;
  }

  .font-toggle .chip-btn {
    padding: 6px 8px;
  }

  .header-inner {
    padding-left: 12px;
    padding-right: 12px;
  }

  .post {
    padding-left: 12px;
    padding-right: 12px;
  }
}