/*
 * 样式表：个人 X 存档站点
 *
 * 设计系统：Claude by Anthropic（DESIGN.md）
 * - 暖奶油色画布 --canvas: #faf9f5
 * - 珊瑚色强调 --color-primary: #cc785c
 * - 衬线展示字体 Cormorant Garamond
 * - 无衬线正文字体 Inter
 */

/* ---------------- 设计 token ---------------- */
:root {
  --color-primary: #cc785c;
  --color-primary-active: #a9583e;
  --color-primary-disabled: #e6dfd8;

  --ink: #141413;
  --body: #3d3d3a;
  --body-strong: #252523;
  --muted: #5a5751;
  --muted-soft: #6e6b63;

  --canvas: #faf9f5;
  --surface-soft: #f5f0e8;
  --surface-card: #efe9de;
  --surface-cream-strong: #e8e0d2;
  --surface-dark: #181715;
  --surface-dark-elevated: #252320;

  --hairline: #e6dfd8;
  --hairline-soft: #ebe6df;

  --on-primary: #ffffff;
  --on-dark: #faf9f5;
  --on-dark-soft: #a09d96;

  --accent-teal: #5db8a6;
  --accent-amber: #e8a55a;
  --success: #5db872;
  --error: #c64545;

  --font-display: 'Cormorant Garamond', 'EB Garamond', 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-code: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  --text-display-xl: clamp(2.5rem, 5vw, 4rem);
  --text-display-lg: clamp(2rem, 4vw, 3rem);
  --text-title-lg: 1.375rem;
  --text-title-md: 1.125rem;
  --text-title-sm: 1rem;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.8125rem;
  --text-code: 0.875rem;

  --space-xxs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-xxl: 3rem;
  --space-section: 6rem;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  --sidebar-left-width: 275px;
  --main-feed-width: 600px;
  --sidebar-right-width: 350px;
  --layout-max-width: 1265px;
}

/* ---------------- Reset & Base ---------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  color: var(--body);
  background-color: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ---------------- 无障碍 ---------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background: var(--surface-dark);
  color: var(--on-dark);
  border-radius: var(--radius-md);
}

.skip-link:focus {
  top: var(--space-md);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.noscript-notice {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--canvas);
  padding: var(--space-xl);
  text-align: center;
  z-index: 999;
}

/* ---------------- 动画 ---------------- */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.tweet-card {
  animation: fade-in-up 0.35s ease backwards;
}

/* 初始加载时前 24 条推文交错淡入；后续无限滚动加载的卡片保持淡入但不再严格交错 */
.tweet-card:nth-child(1) { animation-delay: 0ms; }
.tweet-card:nth-child(2) { animation-delay: 40ms; }
.tweet-card:nth-child(3) { animation-delay: 80ms; }
.tweet-card:nth-child(4) { animation-delay: 120ms; }
.tweet-card:nth-child(5) { animation-delay: 160ms; }
.tweet-card:nth-child(6) { animation-delay: 200ms; }
.tweet-card:nth-child(7) { animation-delay: 240ms; }
.tweet-card:nth-child(8) { animation-delay: 280ms; }
.tweet-card:nth-child(9) { animation-delay: 320ms; }
.tweet-card:nth-child(10) { animation-delay: 360ms; }
.tweet-card:nth-child(11) { animation-delay: 400ms; }
.tweet-card:nth-child(12) { animation-delay: 440ms; }
.tweet-card:nth-child(13) { animation-delay: 480ms; }
.tweet-card:nth-child(14) { animation-delay: 520ms; }
.tweet-card:nth-child(15) { animation-delay: 560ms; }
.tweet-card:nth-child(16) { animation-delay: 600ms; }
.tweet-card:nth-child(17) { animation-delay: 640ms; }
.tweet-card:nth-child(18) { animation-delay: 680ms; }
.tweet-card:nth-child(19) { animation-delay: 720ms; }
.tweet-card:nth-child(20) { animation-delay: 760ms; }
.tweet-card:nth-child(21) { animation-delay: 800ms; }
.tweet-card:nth-child(22) { animation-delay: 840ms; }
.tweet-card:nth-child(23) { animation-delay: 880ms; }
.tweet-card:nth-child(24) { animation-delay: 920ms; }

/* ---------------- 布局 ---------------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-left-width) var(--main-feed-width) var(--sidebar-right-width);
  gap: 0 var(--space-lg);
  max-width: var(--layout-max-width);
  margin: 0 auto;
  min-height: 100vh;
}

.sidebar-left {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg) var(--space-md) var(--space-xxl);
  border-right: 1px solid var(--hairline);
}

.main-feed {
  min-height: 100vh;
  border-right: 1px solid var(--hairline);
}

.sidebar-right {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: var(--space-md) var(--space-xxl) var(--space-md) var(--space-md);
}

/* ---------------- 左侧导航 ---------------- */
.nav-header {
  padding: var(--space-sm) var(--space-md);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  padding: var(--space-sm);
  border-radius: var(--radius-pill);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.nav-logo:hover,
.nav-logo:focus {
  background-color: var(--surface-soft);
  transform: scale(1.05);
}

.nav-logo svg {
  width: 32px;
  height: 32px;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  font-size: var(--text-title-md);
  font-weight: 500;
  color: var(--ink);
  border-radius: var(--radius-pill);
  transition: background-color 0.2s ease;
}

.nav-item:hover,
.nav-item:focus,
.nav-item[aria-current="page"] {
  background-color: var(--surface-soft);
}

.nav-user-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  margin-top: auto;
  border-radius: var(--radius-xl);
  transition: background-color 0.2s ease;
}

.nav-user-card:hover {
  background-color: var(--surface-soft);
}

.nav-user-card .user-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 导航图标：桌面端隐藏（侧栏已有文字标签），移动端显示 */
.nav-icon {
  display: none;
  flex-shrink: 0;
}

/* ---------------- 头像 ---------------- */
.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  object-fit: cover;
  background-color: var(--surface-card);
}

.avatar--sm {
  width: 40px;
  height: 40px;
}

.profile-avatar {
  width: 88px;
  height: 88px;
  border-radius: var(--radius-pill);
  border: 4px solid var(--canvas);
  margin-top: -44px;
  object-fit: cover;
  background-color: var(--surface-card);
}

/* ---------------- 用户信息文字 ---------------- */
.display-name {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.username,
.tweet-username,
.profile-username {
  color: var(--muted);
  font-size: var(--text-body-sm);
}

/* ---------------- 中间信息流 ---------------- */
.feed-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: rgba(250, 249, 245, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
}

.feed-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md) 0;
  gap: var(--space-md);
}

.feed-title {
  font-family: var(--font-display);
  font-size: var(--text-title-lg);
  font-weight: 600;
  color: var(--ink);
  padding: var(--space-md) var(--space-md) var(--space-sm);
  flex: 1;
}

.feed-header__top .feed-title {
  padding: var(--space-sm) 0;
}

.clear-search {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-pill);
  background-color: var(--surface-soft);
  color: var(--muted);
  font-size: var(--text-body-sm);
  font-weight: 500;
  transition: color 0.2s ease, background-color 0.2s ease;
  white-space: nowrap;
}

.clear-search:hover,
.clear-search:focus {
  color: var(--ink);
  background-color: var(--surface-card);
}

.clear-search svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ---------------- 移动端搜索入口 ---------------- */
.feed-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* 桌面端隐藏移动端搜索控件；在 <768px 媒体查询中恢复 */
.mobile-search-toggle,
.mobile-search-form {
  display: none;
}

.mobile-search-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  color: var(--muted);
  background-color: var(--surface-soft);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.mobile-search-toggle:hover,
.mobile-search-toggle:focus-visible {
  color: var(--color-primary);
  background-color: var(--surface-card);
}

.mobile-search-toggle svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.mobile-search-form {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 var(--space-md);
  background-color: var(--surface-soft);
  border-bottom: 1px solid transparent;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  visibility: hidden;
  transition: max-height 0.25s ease, opacity 0.2s ease, padding 0.25s ease, border-color 0.25s ease, visibility 0.25s ease;
}

.mobile-search-form.is-open {
  max-height: 64px;
  opacity: 1;
  padding: var(--space-sm) var(--space-md);
  border-bottom-color: var(--hairline);
  visibility: visible;
}

.mobile-search-form__icon {
  color: var(--muted);
  flex-shrink: 0;
}

.mobile-search-form input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--ink);
  font-size: var(--text-body);
  min-width: 0;
}

.mobile-search-form input::placeholder {
  color: var(--muted);
}

.mobile-search-form input:focus {
  outline: none;
}

.mobile-search-form__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--on-primary);
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.mobile-search-form__submit:hover,
.mobile-search-form__submit:focus-visible {
  background-color: var(--color-primary-active);
  transform: translateY(-1px);
}

.mobile-search-form__submit svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---------------- 搜索状态提示 ---------------- */
.model-loading-state {
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  color: var(--muted-soft);
  background-color: var(--surface-soft);
  border-bottom: 1px solid var(--hairline);
}

.model-loading-state p {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-sm);
}

.progress-indeterminate {
  width: 100%;
  max-width: 320px;
  height: 4px;
  margin: 0 auto;
  background-color: var(--hairline);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.progress-indeterminate::after {
  content: '';
  position: absolute;
  top: 0;
  left: -40%;
  width: 40%;
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-pill);
  animation: progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes progress-indeterminate {
  0% {
    left: -40%;
    width: 40%;
  }
  50% {
    width: 50%;
  }
  100% {
    left: 120%;
    width: 40%;
  }
}

.search-state {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
}

.search-state p {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.search-state--error {
  color: var(--error);
  background-color: rgba(198, 69, 69, 0.06);
}

.search-state--empty {
  color: var(--muted);
  font-style: italic;
}

.search-state--info {
  color: var(--muted-soft);
}

.search-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--hairline);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}

@keyframes spinner-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ---------------- 标签页 ---------------- */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--hairline);
}

.tab {
  flex: 1;
  padding: var(--space-md) var(--space-sm);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, background-color 0.2s ease, border-bottom-color 0.25s ease, font-weight 0.15s ease;
  position: relative;
}

/* 标签页底部指示线使用伪元素以获得更平滑的过渡体验 */
.tab::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}

.tab[aria-selected="true"]::after {
  transform: scaleX(1);
}

.tab:hover,
.tab:focus {
  color: var(--ink);
  background-color: var(--surface-soft);
}

.tab[aria-selected="true"] {
  color: var(--ink);
  font-weight: 600;
}

/* ---------------- 推文流 ---------------- */
.tweet-stream {
  min-height: 50vh;
}

.loading-state,
.empty-state {
  padding: var(--space-xxl) var(--space-md);
  text-align: center;
  color: var(--muted);
}

.tweet-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  padding: var(--space-md);
  border-bottom: 1px solid var(--hairline);
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.tweet-card:hover {
  background-color: var(--surface-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(20, 20, 19, 0.06);
}

.tweet-avatar {
  flex-shrink: 0;
}

.tweet-body {
  min-width: 0;
}

.tweet-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
  flex-wrap: wrap;
}

.tweet-author {
  font-weight: 600;
  color: var(--ink);
}

.tweet-time {
  color: var(--muted);
  font-size: var(--text-body-sm);
}

.tweet-time::before {
  content: '·';
  margin-right: var(--space-xs);
}

.tweet-text {
  color: var(--body);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.55;
}

.tweet-text a.text-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

.tweet-text a.text-link:hover {
  color: var(--color-primary-active);
}

/* ---------------- 长推文展开/收起 ---------------- */
/* 截断状态：使用 line-clamp 限制为 6 行 */
.tweet-text--truncated .tweet-text-content {
  display: -webkit-box;
  -webkit-line-clamp: 6;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 展开状态：移除截断 */
.tweet-text--truncated.expanded .tweet-text-content {
  display: block; /* 降级：不支持 line-clamp 时直接显示完整内容 */
  -webkit-line-clamp: unset;
  overflow: visible;
}

/* 降级：浏览器不支持 line-clamp 时，截断状态使用 max-height 近似 */
@supports not (-webkit-line-clamp: 6) {
  .tweet-text--truncated:not(.expanded) .tweet-text-content {
    max-height: calc(1.55em * 6); /* line-height * 6 行 */
    overflow: hidden;
    display: block;
  }
}

/* 展开/收起按钮 */
.expand-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xxs);
  margin-top: var(--space-xs);
  padding: var(--space-xxs) var(--space-xs);
  border-radius: var(--radius-pill);
  color: var(--color-primary);
  font-size: var(--text-body-sm);
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.expand-btn:hover,
.expand-btn:focus-visible {
  background-color: rgba(204, 120, 92, 0.1);
  color: var(--color-primary-active);
}

.expand-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.expand-btn__icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

/* 减少动画偏好：禁用图标旋转动画 */
@media (prefers-reduced-motion: reduce) {
  .expand-btn__icon {
    transition: none;
  }
}

.search-highlight {
  color: var(--color-primary-active);
  font-weight: 600;
  background-color: rgba(204, 120, 92, 0.12);
  padding: 0 0.125rem;
  border-radius: var(--radius-xs);
}

/* ---------------- 转发 / 引用 / 回复标识 ---------------- */
.retweet-label,
.reply-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--muted);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-xs);
}

.retweet-label svg,
.reply-label svg {
  width: 16px;
  height: 16px;
}

.quote-card {
  margin-top: var(--space-sm);
  padding: var(--space-md);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background-color: var(--canvas);
}

.quote-card .tweet-text {
  margin-top: var(--space-xs);
}

/* ---------------- 媒体网格 ---------------- */
.media-grid {
  margin-top: var(--space-sm);
  display: grid;
  gap: var(--space-xs);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 100%;
}

.media-grid--single {
  grid-template-columns: 1fr;
  max-width: 100%;
}

.media-grid--single .media-item {
  max-height: 520px;
  object-fit: cover;
  width: 100%;
}

.media-grid--two {
  grid-template-columns: repeat(2, 1fr);
}

.media-grid--three {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(2, 1fr);
}

.media-grid--three .media-item:first-child {
  grid-row: span 2;
}

.media-grid--four {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
}

.media-item {
  width: 100%;
  height: 100%;
  min-height: 160px;
  max-height: 360px;
  object-fit: cover;
  background-color: var(--surface-card);
}

.media-item video {
  width: 100%;
  height: 100%;
  max-height: 480px;
  background-color: var(--surface-dark);
}

/* ---------------- Lucide SVG 图标适配 ---------------- */
/* Lucide icons use stroke instead of fill; ensure color inherits from parent */
.nav-logo svg,
.search-icon,
.retweet-label svg,
.reply-label svg,
.action-item svg {
  fill: none;
  stroke: currentColor;
}

/* ---------------- 互动栏 ---------------- */
.tweet-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-top: var(--space-sm);
  color: var(--muted);
  font-size: var(--text-body-sm);
  flex-wrap: wrap;
}

.action-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  white-space: nowrap;
  transition: color 0.2s ease, transform 0.2s ease;
}

.action-item:hover {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.action-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* "更多"按钮需要区别于普通统计项 */
.action-item--more {
  margin-left: auto;
  padding: var(--space-xs);
  border-radius: var(--radius-pill);
  color: var(--muted);
}

.action-item--more:hover {
  background-color: var(--surface-soft);
  color: var(--ink);
}

/* ---------------- 右侧边栏 ---------------- */
.search-box {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--surface-soft);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-lg);
}

.search-box:focus-within {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--ink);
  font-size: var(--text-body);
  min-width: 0;
}

.search-box input::placeholder {
  color: var(--muted);
}

.search-box input:focus {
  outline: none;
}

.search-icon {
  color: var(--muted);
  flex-shrink: 0;
}

.search-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs);
  margin: calc(-1 * var(--space-xs));
  border-radius: var(--radius-pill);
  color: var(--muted);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.search-button:hover,
.search-button:focus {
  color: var(--color-primary);
  background-color: var(--surface-card);
}

.search-button svg {
  fill: none;
  stroke: currentColor;
}

.profile-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--hairline);
}

.profile-banner {
  width: 100%;
  height: 120px;
  background-color: var(--surface-cream-strong);
}

.profile-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-info {
  padding: 0 var(--space-md) var(--space-md);
}

.profile-name {
  font-family: var(--font-display);
  font-size: var(--text-title-lg);
  font-weight: 600;
  color: var(--ink);
  margin-top: var(--space-xs);
}

.profile-bio {
  margin-top: var(--space-sm);
  color: var(--body);
  white-space: pre-wrap;
}

.profile-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  color: var(--muted);
  font-size: var(--text-body-sm);
}

.profile-meta a {
  color: var(--color-primary);
  text-decoration: underline;
}

.profile-stats {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  color: var(--muted);
  font-size: var(--text-body-sm);
}

.profile-stats strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------------- 移动端个人资料视图 ---------------- */
.profile-view {
  padding: var(--space-md);
}

.profile-view .profile-card {
  margin: 0;
}

/* ---------------- 永久链接视图 ---------------- */
.permalink-view {
  padding: 0;
  max-width: var(--main-feed-width);
  margin: 0 auto;
}

.permalink-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-md);
}

.permalink-locate-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--on-primary);
  font-size: var(--text-body-sm);
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.permalink-locate-btn:hover,
.permalink-locate-btn:focus-visible {
  background-color: var(--color-primary-active);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(204, 120, 92, 0.25);
}

.permalink-locate-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.permalink-locate-btn svg {
  flex-shrink: 0;
}

/* 窄屏幕下定位按钮只显示图标，避免文字挤占空间 */
@media (max-width: 480px) {
  .permalink-locate-btn span {
    display: none;
  }
}

/* 减少动画偏好：禁用永久链接按钮的悬停动效 */
@media (prefers-reduced-motion: reduce) {
  .permalink-locate-btn {
    transition: none;
  }

  .permalink-locate-btn:hover,
  .permalink-locate-btn:focus-visible {
    transform: none;
  }
}

/* ---------------- 文章列表 ---------------- */
.article-list {
  padding: var(--space-md);
}

.article-card {
  padding: var(--space-md);
  border-bottom: 1px solid var(--hairline);
  transition: background-color 0.2s ease;
}

.article-card:hover {
  background-color: var(--surface-soft);
}

.article-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-title-md);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-xs);
}

.article-card p {
  color: var(--muted);
  font-size: var(--text-body-sm);
}

/* ---------------- 文章详情 ---------------- */
.article-detail {
  padding: var(--space-md);
}

.article-detail h1 {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.article-detail h2 {
  font-family: var(--font-display);
  font-size: var(--text-title-lg);
  font-weight: 500;
  color: var(--ink);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.article-detail p {
  margin-bottom: var(--space-md);
  color: var(--body);
  line-height: 1.7;
}

.article-detail blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-primary);
  background-color: var(--surface-soft);
  color: var(--body);
  font-style: italic;
}

.article-detail a {
  color: var(--color-primary);
  text-decoration: underline;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  font-weight: 500;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: var(--color-primary-active);
}

/* ---------------- 推文元数据弹窗 ---------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background-color: rgba(24, 23, 21, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-backdrop[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop[aria-hidden="false"] .modal-panel {
  animation: scale-in 0.25s ease backwards;
}

.modal-panel {
  width: 100%;
  max-width: 520px;
  max-height: calc(100vh - var(--space-xl) * 2);
  overflow-y: auto;
  background-color: var(--canvas);
  border-radius: var(--radius-xl);
  box-shadow: 0 16px 48px rgba(20, 20, 19, 0.18);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--hairline);
}

.modal-title {
  font-family: var(--font-display);
  font-size: var(--text-title-md);
  font-weight: 600;
  color: var(--ink);
}

.modal-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs);
  border-radius: var(--radius-pill);
  color: var(--muted);
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.modal-close:hover,
.modal-close:focus {
  background-color: var(--surface-soft);
  color: var(--ink);
  transform: rotate(90deg);
}

.modal-body {
  padding: var(--space-md) var(--space-lg);
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: flex-end;
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-primary);
  color: var(--on-primary);
  border-radius: var(--radius-pill);
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.modal-link:hover,
.modal-link:focus {
  background-color: var(--color-primary-active);
  transform: translateY(-1px);
}

.meta-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm) var(--space-md);
  margin: 0;
}

.meta-list dt {
  color: var(--muted);
  font-size: var(--text-body-sm);
  font-weight: 500;
}

.meta-list dd {
  margin: 0;
  color: var(--body);
  word-break: break-word;
}

.meta-list dd code {
  font-family: var(--font-code);
  font-size: var(--text-code);
  background-color: var(--surface-soft);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-xs);
}

/* ---------------- 相似度徽章 ---------------- */
.similarity-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.6rem;
  margin-left: auto;
  margin-right: var(--space-sm);
  font-size: var(--text-caption);
  font-weight: 600;
  font-family: var(--font-code);
  color: var(--color-primary-active);
  background-color: var(--surface-card);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-pill);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.similarity-badge:hover,
.similarity-badge:focus-visible {
  background-color: var(--color-primary);
  color: var(--on-primary);
  transform: translateY(-1px);
}

.similarity-badge:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---------------- 定位到时间线按钮 ---------------- */
.action-item--locate {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  white-space: nowrap;
  color: var(--muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.action-item--locate:hover,
.action-item--locate:focus-visible {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.action-item--locate:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 窄屏幕下定位按钮只显示图标，避免文字挤占空间 */
@media (max-width: 480px) {
  .action-item--locate span {
    display: none;
  }
}

/* 减少动画偏好：禁用相似度徽章与定位按钮的悬停动效 */
@media (prefers-reduced-motion: reduce) {
  .similarity-badge,
  .action-item--locate {
    transition: none;
  }

  .similarity-badge:hover,
  .similarity-badge:focus-visible,
  .action-item--locate:hover,
  .action-item--locate:focus-visible {
    transform: none;
  }
}

/* ---------------- 时间线定位高亮 ---------------- */
@keyframes highlight-pulse {
  0% {
    background-color: var(--surface-soft);
    box-shadow: 0 0 0 0 rgba(204, 120, 92, 0.35);
  }
  50% {
    background-color: rgba(204, 120, 92, 0.08);
    box-shadow: 0 0 0 4px rgba(204, 120, 92, 0.15);
  }
  100% {
    background-color: var(--surface-soft);
    box-shadow: 0 0 0 0 rgba(204, 120, 92, 0.35);
  }
}

.tweet-card--highlighted {
  animation: highlight-pulse 2.5s ease-in-out;
  background-color: var(--surface-soft);
  box-shadow: 0 0 0 2px rgba(204, 120, 92, 0.25);
}

/* 减少动画偏好：仅保留静态高亮 */
@media (prefers-reduced-motion: reduce) {
  .tweet-card--highlighted {
    animation: none;
    background-color: rgba(204, 120, 92, 0.08);
    box-shadow: 0 0 0 2px rgba(204, 120, 92, 0.35);
  }
}

/* ---------------- 搜索详情弹窗 ---------------- */
.search-detail-panel {
  max-width: 640px;
}

.search-detail-error {
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  color: var(--error);
  background-color: rgba(198, 69, 69, 0.06);
  border: 1px solid rgba(198, 69, 69, 0.2);
  border-radius: var(--radius-md);
  font-size: var(--text-body-sm);
}

.vector-block {
  margin-top: var(--space-lg);
}

.vector-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.vector-block__header h3 {
  font-family: var(--font-display);
  font-size: var(--text-title-sm);
  font-weight: 600;
  color: var(--ink);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-pill);
  background-color: var(--surface-soft);
  color: var(--muted);
  font-size: var(--text-body-sm);
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background-color: var(--surface-card);
  color: var(--ink);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.copy-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.vector-pre {
  max-height: 300px;
  overflow: auto;
  padding: var(--space-md);
  background-color: var(--surface-dark);
  color: var(--on-dark);
  font-family: var(--font-code);
  font-size: var(--text-code);
  line-height: 1.6;
  border-radius: var(--radius-md);
  white-space: pre-wrap;
  word-break: break-all;
}

.vector-pre:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1199px) {
  .layout {
    grid-template-columns: 88px var(--main-feed-width) 1fr;
    gap: 0 var(--space-md);
  }

  .sidebar-left {
    padding: var(--space-md);
    align-items: center;
  }

  .nav-menu {
    align-items: center;
  }

  .nav-item {
    justify-content: center;
    padding: var(--space-md);
  }

  .nav-item span,
  .nav-user-card .user-info {
    display: none;
  }

  .nav-user-card {
    justify-content: center;
    padding: var(--space-sm);
  }

  .sidebar-right {
    padding: var(--space-md);
  }
}

@media (max-width: 1023px) {
  .layout {
    grid-template-columns: 88px 1fr;
  }

  .sidebar-right {
    display: none;
  }
}

@media (max-width: 767px) {
  .layout {
    display: block;
    padding-bottom: 70px;
  }

  .sidebar-left {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    height: auto;
    flex-direction: row;
    justify-content: space-around;
    padding: var(--space-xs) 0;
    border-right: none;
    border-top: 1px solid var(--hairline);
    background-color: rgba(250, 249, 245, 0.95);
    backdrop-filter: blur(12px);
    z-index: 100;
  }

  .nav-header,
  .nav-user-card {
    display: none;
  }

  .nav-menu {
    flex-direction: row;
    width: 100%;
    justify-content: space-around;
  }

  .nav-item {
    flex-direction: column;
    gap: 2px;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-size: var(--text-caption);
    font-weight: 500;
  }

  .nav-icon {
    display: block;
    width: 22px;
    height: 22px;
  }

  /* 隐藏桌面端标签页，移动端使用底部导航进行筛选 */
  .tabs {
    display: none;
  }

  /* 显示移动端搜索入口 */
  .mobile-search-toggle {
    display: inline-flex;
  }

  .mobile-search-form {
    display: flex;
  }

  .feed-title {
    font-size: var(--text-title-md);
  }

  .tab {
    font-size: var(--text-caption);
    padding: var(--space-sm) var(--space-xs);
  }

  .profile-card {
    margin: var(--space-md);
  }

  /* 个人资料视图在移动端可见 */
  .profile-view {
    display: block;
  }

  /* 移动端互动栏更紧凑，避免按钮换行或溢出 */
  .tweet-actions {
    gap: var(--space-md);
    font-size: var(--text-caption);
  }

  .action-item svg {
    width: 14px;
    height: 14px;
  }
}

/* ---------------- 工具类 ---------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

/* ---------------- 减少动画偏好 ---------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .tweet-card:hover,
  .action-item:hover,
  .action-item--share:hover,
  .action-item--share:focus-visible,
  .modal-link:hover,
  .modal-close:hover,
  .nav-logo:hover {
    transform: none !important;
  }
}

/* ---------------- Toast 轻提示 ---------------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-dark, #181715);
  color: var(--on-dark, #faf9f5);
  padding: 12px 20px;
  border-radius: var(--radius-md, 8px);
  font-size: var(--text-body-sm, 14px);
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 1;
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: auto;
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(8px);
  pointer-events: none;
}

/* ---------------- 分享按钮特定样式 ---------------- */
.action-item--share {
  color: var(--muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.action-item--share:hover,
.action-item--share:focus-visible {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.action-item--share:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}