/* ============================================================
   夕辉社区 - Main CSS
   Modern · Multi-device · Dark mode auto
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-surface-2: #fafbfc;
  --color-border: #ececec;
  --color-text: #1f2328;
  --color-text-2: #4e5969;
  --color-text-3: #86909c;
  --color-primary: #0d7dbb;
  --color-primary-hover: #0a6596;
  --color-primary-soft: #e6f4fb;
  --color-danger: #f53f3f;
  --color-success: #00b42a;
  --color-warning: #ff7d3b;
  --color-pinned: #ff9500;
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-shadow-strong: rgba(0, 0, 0, 0.12);
  --color-overlay: rgba(0, 0, 0, 0.5);
  --color-modal-bg: rgba(0, 0, 0, 0.88);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --header-h: 56px;
  --shadow-sm: 0 1px 2px var(--color-shadow);
  --shadow: 0 2px 8px var(--color-shadow);
  --shadow-lg: 0 8px 24px var(--color-shadow-strong);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;

  --max-w: 1200px;
  --gap: 16px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"], html.dark, html.theme-dark {
  --color-bg: #18181c;
  --color-surface: #232328;
  --color-surface-2: #2a2a30;
  --color-border: #2f2f36;
  --color-text: #e8e8eb;
  --color-text-2: #b4b4bb;
  --color-text-3: #7a7a82;
  --color-primary: #4ba8d8;
  --color-primary-hover: #6abce5;
  --color-primary-soft: #1c2e3a;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-strong: rgba(0, 0, 0, 0.5);
  --color-overlay: rgba(0, 0, 0, 0.7);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #18181c;
    --color-surface: #232328;
    --color-surface-2: #2a2a30;
    --color-border: #2f2f36;
    --color-text: #e8e8eb;
    --color-text-2: #b4b4bb;
    --color-text-3: #7a7a82;
    --color-primary: #4ba8d8;
    --color-primary-hover: #6abce5;
    --color-primary-soft: #1c2e3a;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-strong: rgba(0, 0, 0, 0.5);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.15s var(--ease); }
a:hover { color: var(--color-primary-hover); }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; line-height: 1.3; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
.muted { color: var(--color-text-3); font-size: 12px; }
.dot { color: var(--color-text-3); margin: 0 4px; }
.icon { display: inline-block; vertical-align: -3px; flex-shrink: 0; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
  width: 100%;
}
.layout { display: grid; grid-template-columns: 240px 1fr; gap: 24px; margin-top: 16px; }
.layout-narrow { max-width: 760px; margin: 0 auto; padding: 16px; }
.page { min-height: calc(100vh - var(--header-h)); padding-bottom: 60px; }
.page-narrow { padding: 24px 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(180%) blur(10px);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
}
.header-inner {
  display: flex; align-items: center; gap: 16px;
  height: var(--header-h);
}
.brand {
  display: flex; align-items: center; gap: 8px;
  color: var(--color-text);
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}
.brand:hover { color: var(--color-primary); }
.brand-logo { color: var(--color-primary); display: flex; }
.brand-name { white-space: nowrap; }

.primary-nav {
  display: flex; align-items: center; gap: 4px;
  margin-left: 8px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.primary-nav::-webkit-scrollbar { display: none; }
.nav-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text-2);
  font-size: 14px;
  white-space: nowrap;
  transition: all 0.15s var(--ease);
}
.nav-link:hover { background: var(--color-surface-2); color: var(--color-text); }
.nav-link.active { color: var(--color-primary); background: var(--color-primary-soft); }

.header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.icon-btn {
  width: 36px; height: 36px;
  border: none; background: transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-2);
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.15s var(--ease);
}
.icon-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
.mobile-menu-btn { display: none; }

/* User menu */
.user-menu { position: relative; }
.avatar-btn {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center;
  overflow: hidden;
  text-decoration: none;
}
.avatar-btn:hover { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary-soft); }
.avatar-img { width: 100%; height: 100%; object-fit: cover; }
.user-dropdown {
  position: absolute; right: 0; top: 100%; margin-top: 4px;
  min-width: 180px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 4px;
  display: none;
  z-index: 100;
}
.user-menu.open .user-dropdown { display: block; }
.dropdown-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 13px;
}
.dropdown-item:hover { background: var(--color-surface-2); color: var(--color-text); }
.dropdown-divider { height: 1px; background: var(--color-border); margin: 4px 0; }

/* Mobile drawer menu */
.mobile-drawer {
  display: none;
  position: fixed; inset: 0;
  z-index: 200;
}
.mobile-drawer.open { display: block; }
.drawer-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.45);
  animation: fadeIn 0.2s ease;
}
.drawer-panel {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 82vw; max-width: 380px;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform 0.25s var(--ease);
  display: flex; flex-direction: column;
  overflow-y: auto;
}
.mobile-drawer.open .drawer-panel {
  transform: translateX(0);
}
/* User area */
.drawer-user {
  display: flex; align-items: center; gap: 14px;
  padding: 28px 20px 20px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #084f78 100%);
  color: #fff;
}
.drawer-user-avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid rgba(255,255,255,0.3);
  display: flex; align-items: center; justify-content: center;
}
.drawer-user-avatar img { width: 100%; height: 100%; object-fit: cover; }
.drawer-user-info { flex: 1; min-width: 0; }
.drawer-user-name {
  display: block;
  font-size: 16px; font-weight: 600;
  color: #fff; text-decoration: none;
  margin-bottom: 6px;
}
.drawer-user-name:hover { text-decoration: underline; }
.drawer-post-btn {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 500;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  background: rgba(255,255,255,0.15);
  padding: 4px 10px; border-radius: 20px;
  transition: background 0.15s;
}
.drawer-post-btn:hover { background: rgba(255,255,255,0.25); }
.drawer-auth-btns { display: flex; gap: 8px; margin-top: 8px; }
.drawer-auth-btns .btn { font-size: 12px; padding: 5px 12px; }

/* Drawer nav */
.drawer-nav { flex: 1; padding: 8px 0; }
.drawer-section { padding: 4px 0; }
.drawer-section + .drawer-section { border-top: 1px solid var(--color-border); }
.drawer-section-title {
  display: block;
  padding: 8px 20px 4px;
  font-size: 11px; font-weight: 600;
  color: var(--color-text-3);
  text-transform: uppercase; letter-spacing: 0.5px;
}
.drawer-link {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 20px;
  color: var(--color-text);
  font-size: 14px; text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.drawer-link:hover { background: var(--color-surface-2); }
.drawer-link.active { color: var(--color-primary); font-weight: 500; }
.drawer-cat-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.drawer-link-count {
  margin-left: auto;
  font-size: 12px; color: var(--color-text-3);
}

@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: all 0.15s var(--ease);
  text-decoration: none;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; padding: 10px 16px; font-size: 15px; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn-ghost { background: transparent; color: var(--color-text-2); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-surface-2); color: var(--color-text); }

/* ---------- Sidebar ---------- */
.sidebar { display: flex; flex-direction: column; gap: 16px; position: sticky; top: calc(var(--header-h) + 16px); align-self: start; }
.sidebar-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px; }
.sidebar-section { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.sidebar-title {
  display: flex; align-items: center; gap: 6px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-3);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-link {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  color: var(--color-text);
  font-size: 14px;
  transition: background 0.15s var(--ease);
}
.sidebar-link:hover { background: var(--color-surface-2); }
.sidebar-link.active { background: var(--color-primary-soft); color: var(--color-primary); font-weight: 500; }
.sidebar-link-icon { display: inline-flex; }
.sidebar-link-text { flex: 1; }
.sidebar-link-count { font-size: 12px; color: var(--color-text-3); }

/* ---------- Content Header ---------- */
.content-header { margin-bottom: 16px; padding: 0 4px; }
.content-title { display: flex; align-items: center; gap: 8px; font-size: 22px; }
.content-desc { color: var(--color-text-3); margin-top: 4px; font-size: 13px; }

/* ---------- Thread Card (新版) ---------- */
.thread-list { display: flex; flex-direction: column; gap: 12px; }

.thread-card-new {
  background: var(--color-surface);
  border:1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  transition: box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
  position: relative;
  min-width: 0;
  overflow-wrap: break-word;
}
.thread-card-new:hover {
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  border-color: color-mix(in srgb, var(--color-primary) 20%, var(--color-border));
}

/* 顶部：头像 + 昵称 + 时间 */
.tcn-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  min-width: 0;
}
.tcn-user {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.tcn-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-surface-2);
  display: block;
}
.tcn-avatar img { width: 100%; height: 100%; object-fit: cover; }
.tcn-avatar-fallback {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%;
  color: #fff; font-weight: 600; font-size: 16px;
}
.tcn-meta {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.tcn-username {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}
.tcn-time {
  font-size: 12px;
  color: var(--color-text-3);
  line-height: 1.3;
}

/* 徽章 */
.tcn-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 500;
  flex-shrink: 0;
}
.tcn-badge-pin { background: var(--color-pinned); color: #fff; }
.tcn-badge-digest { background: #722ed1; color: #fff; }

/* 标题 */
.tcn-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: 6px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.tcn-title:hover { color: var(--color-primary); }

/* 内容预览 */
.tcn-preview {
  font-size: 13px;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: 10px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* 图片（最多3张，横向） */
.tcn-imgs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  overflow: hidden;
}
.tcn-img {
  width: 100px;
  height: 100px;
  border-radius: 6px;
  overflow: hidden;
  background: var(--color-surface-2);
  flex-shrink: 0;
  cursor: zoom-in;
  position: relative;
}
.tcn-img img { width: 100%; height: 100%; object-fit: cover; }
.tcn-img-more {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: rgba(0,0,0,0.45);
}

/* 底部：标签 + 互动数据 */
.tcn-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.tcn-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tcn-tag {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}
.tcn-stats {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--color-text-3);
  font-size: 12px;
}
.tcn-stat {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.tcn-stat-like { cursor: pointer; transition: color 0.15s; }
.tcn-stat-like:hover { color: var(--color-primary); }
.tcn-stat-like.is-active { color: var(--color-primary); }

/* 保留旧版公共类（其他地方可能用到） */
.avatar-fallback-lg { width: 80px; height: 80px; font-size: 32px; border-radius: 50%; }
.card-action.is-active { color: var(--color-primary); }
.card-action-right { margin-left: auto; }

/* ---------- Thread Detail ---------- */
.back-link {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--color-text-3);
  font-size: 13px;
  margin-bottom: 12px;
}
.back-link:hover { color: var(--color-primary); }
.thread-detail { padding: 20px; }
.td-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.td-meta { flex: 1; }
.td-sub { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--color-text-3); margin-top: 2px; }
.td-title { font-size: 22px; line-height: 1.4; margin: 12px 0 16px; }
.td-content {
  font-size: 15px; line-height: 1.8;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
}
.td-content p { margin: 0 0 12px; }
.td-content ul, .td-content ol { padding-left: 24px; margin: 0 0 12px; }
.td-content img { border-radius: var(--radius-sm); margin: 8px 0; }
.td-imgs {
  display: grid;
  gap: 8px;
  margin: 16px 0;
  max-width: 760px;
}
.td-imgs-1 { grid-template-columns: 1fr; max-width: 480px; }
.td-imgs-2 { grid-template-columns: 1fr 1fr; max-width: 480px; }
.td-imgs-3, .td-imgs-4, .td-imgs-5, .td-imgs-6, .td-imgs-7, .td-imgs-8, .td-imgs-9 {
  grid-template-columns: repeat(3, 1fr);
}
.td-img {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-surface-2);
  aspect-ratio: 1/1;
  cursor: zoom-in;
}
.td-imgs-1 .td-img { aspect-ratio: 4/3; }
.td-img img { width: 100%; height: 100%; object-fit: cover; }
.td-actions { display: flex; gap: 8px; padding-top: 16px; border-top: 1px solid var(--color-border); margin-top: 20px; }

/* ---------- Replies ---------- */
.replies { margin-top: 24px; }
.replies-title { font-size: 18px; margin-bottom: 16px; }
.reply-form { margin-bottom: 24px; }
.reply-form-actions { display: flex; justify-content: flex-end; margin-top: 8px; }
.reply-list { display: flex; flex-direction: column; gap: 12px; }
.reply-item {
  display: flex; gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px;
}
.reply-avatar { flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%; overflow: hidden; }
.reply-avatar img { width: 100%; height: 100%; object-fit: cover; }
.reply-body { flex: 1; min-width: 0; }
.reply-head { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; font-size: 13px; }
.reply-author { color: var(--color-text); font-weight: 600; }
.reply-content { font-size: 14px; line-height: 1.6; color: var(--color-text); white-space: pre-wrap; word-break: break-word; }
.login-prompt { text-align: center; padding: 24px; background: var(--color-surface-2); border-radius: var(--radius); margin-bottom: 16px; }

/* ---------- Empty / Alert ---------- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-3);
}
.empty-state p { margin: 12px 0; font-size: 14px; }
.alert {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 13px;
}
.alert-error { background: #fef0f0; color: #f53f3f; border: 1px solid #fdbdbd; }
[data-theme="dark"] .alert-error, html.theme-dark .alert-error { background: #3a1a1a; color: #f5a5a5; border-color: #5a2a2a; }

/* ---------- Auth Page (Login / Register) ---------- */
.page-auth {
  min-height: calc(100vh - var(--header-h));
  display: flex; align-items: center; justify-content: center;
  padding: 40px 16px;
  background: linear-gradient(135deg, var(--color-bg) 0%, color-mix(in srgb, var(--color-primary-soft) 30%, var(--color-bg)) 100%);
}
.auth-wrap {
  display: flex;
  max-width: 960px;
  width: 100%;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
/* Brand panel */
.auth-brand {
  flex: 1;
  background: linear-gradient(135deg, var(--color-primary) 0%, #084f78 100%);
  color: #fff;
  padding: 48px 40px;
  display: flex; flex-direction: column; justify-content: center;
  position: relative;
  overflow: hidden;
}
.auth-brand::before {
  content: '';
  position: absolute; top: -60px; right: -60px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.auth-brand::after {
  content: '';
  position: absolute; bottom: -40px; left: -40px;
  width: 160px; height: 160px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.brand-logo-lg {
  margin-bottom: 24px;
  opacity: 0.95;
  position: relative; z-index: 1;
}
.brand-slogan {
  font-size: 26px; font-weight: 700;
  margin-bottom: 8px;
  position: relative; z-index: 1;
}
.brand-desc {
  font-size: 14px; line-height: 1.7;
  opacity: 0.8;
  margin-bottom: 32px;
  position: relative; z-index: 1;
}
.brand-features {
  display: flex; flex-direction: column; gap: 14px;
  position: relative; z-index: 1;
}
.feature-item {
  display: flex; align-items: center; gap: 10px;
  font-size: 14px;
  opacity: 0.85;
}
.feature-item svg { flex-shrink: 0; opacity: 0.9; }
/* Form panel */
.auth-form-card {
  flex: 1;
  padding: 48px 40px;
  display: flex; flex-direction: column; justify-content: center;
}
.auth-form-head { margin-bottom: 24px; }
.auth-form-head .auth-title {
  font-size: 24px; font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}
.auth-form-head .auth-sub {
  font-size: 14px;
  color: var(--color-text-3);
  margin: 0;
}

/* Input with icon */
.input-wrap {
  position: relative;
  display: flex; align-items: center;
}
.input-icon {
  position: absolute; left: 12px;
  color: var(--color-text-3);
  pointer-events: none;
}
.form-input.has-icon {
  padding-left: 40px;
}

/* Auth form */
.auth-form-card .form {
  gap: 18px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn-lg {
  padding: 12px 20px; font-size: 15px; border-radius: var(--radius);
  margin-top: 4px;
}

.auth-switch {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-3);
}
.link-primary {
  color: var(--color-primary); font-weight: 500;
  text-decoration: none;
}
.link-primary:hover { text-decoration: underline; }

.auth-demo {
  margin-top: 24px; padding: 14px 16px;
  background: var(--color-surface-2);
  border-radius: var(--radius);
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
}
.demo-label {
  font-size: 12px; font-weight: 600;
  color: var(--color-text-3);
  text-transform: uppercase; letter-spacing: 0.5px;
}
.demo-account {
  font-size: 12px; font-family: var(--font-mono);
  background: var(--color-surface);
  padding: 3px 8px; border-radius: 4px;
  color: var(--color-text-2);
  border: 1px solid var(--color-border);
}

/* Alert */
.alert {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 13px;
}
.alert-error {
  background: #fef0f0; color: #f53f3f;
  border: 1px solid #fdbdbd;
}
[data-theme="dark"] .alert-error, html.theme-dark .alert-error {
  background: #3a1a1a; color: #f5a5a5; border-color: #5a2a2a;
}

/* Old auth-card fallback (keep for profile etc.) */
.auth-card, .post-card, .profile-header {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
}

/* Form (shared) */
.form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; font-weight: 500; color: var(--color-text-2); }
.form-input, .form-textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 14px;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.form-input::placeholder { color: var(--color-text-3); }
.form-textarea { resize: vertical; min-height: 100px; line-height: 1.6; }
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}
.form-actions { display: flex; justify-content: flex-end; gap: 8px; padding-top: 8px; border-top: 1px solid var(--color-border); }

/* Responsive - Auth */
@media (max-width: 768px) {
  .page-auth {
    padding: 0;
    align-items: flex-start;
    background: var(--color-bg);
    min-height: 100vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .auth-wrap {
    flex-direction: column;
    border-radius: 0;
    box-shadow: none;
    border: none;
    max-width: 100%;
    min-height: 100vh;
  }
  .auth-brand {
    display: none;
  }
  .auth-form-card {
    padding: 24px 20px 40px;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
  }
  .auth-form-head { margin-bottom: 16px; }
  .auth-form-head .auth-title { font-size: 22px; }
  .auth-form-card .form { gap: 14px; }
  .form-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .auth-demo { display: none; }
  .auth-switch { margin-top: 16px; }
}

/* Category picker */
.cat-picker { display: flex; flex-wrap: wrap; gap: 8px; }
.cat-option { cursor: pointer; }
.cat-option input { position: absolute; opacity: 0; pointer-events: none; }
.cat-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text-2);
  font-size: 13px;
  transition: all 0.15s var(--ease);
}
.cat-chip .icon { color: var(--cat-color, var(--color-text-3)); }
.cat-option input:checked + .cat-chip {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 500;
}

/* Upload */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  background: var(--color-surface-2);
  transition: border-color 0.15s var(--ease);
}
.upload-zone.dragover { border-color: var(--color-primary); background: var(--color-primary-soft); }
.upload-trigger {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  width: 100%;
  padding: 20px;
  border: none; background: transparent;
  color: var(--color-text-3);
  font-size: 14px;
}
.upload-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 6px;
  margin-top: 12px;
}
.preview-item {
  position: relative;
  aspect-ratio: 1/1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface);
}
.preview-item img { width: 100%; height: 100%; object-fit: cover; }
.preview-remove {
  position: absolute; top: 4px; right: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: none; background: rgba(0,0,0,0.6);
  color: #fff; font-size: 14px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.td-img {
  cursor: pointer;
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 480px;
}
.td-img img { width: 100%; height: auto; display: block; }

/* Profile */
.profile-header { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 24px; }
.profile-avatar-wrap { position: relative; flex-shrink: 0; display: inline-block; }
.profile-avatar-img { width: 80px; height: 80px; border-radius: 50%; object-fit: cover; }
.profile-avatar { flex-shrink: 0; }
.avatar-edit-btn {
  position: absolute; bottom: 0; right: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid var(--color-surface);
  background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 0.15s var(--ease);
}
.avatar-edit-btn:hover { background: var(--color-primary-hover); }
.profile-meta { flex: 1; }
.profile-name-row { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; flex-wrap: wrap; }
.profile-name { font-size: 22px; }
.profile-bio { color: var(--color-text-2); margin-bottom: 8px; }
.profile-stats { font-size: 13px; color: var(--color-text-3); }
.profile-stats strong { color: var(--color-text); }
.section-title {
  display: flex; align-items: center; gap: 6px;
  font-size: 16px;
  margin: 24px 0 12px;
  color: var(--color-text-2);
}

/* ---------- Image Modal ---------- */
.img-modal {
  display: none;
  position: fixed; inset: 0;
  background: var(--color-modal-bg);
  z-index: 1000;
  align-items: center; justify-content: center;
  padding: 20px;
}
.img-modal.open { display: flex; }
.img-modal img {
  max-width: 95%; max-height: 95%;
  object-fit: contain;
  border-radius: var(--radius);
  cursor: default;
}
.img-modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 40px; height: 40px;
  border: none; border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 0.15s var(--ease);
}
.img-modal-close:hover { background: rgba(255,255,255,0.3); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .hide-on-mobile { display: none !important; }
  .mobile-menu-btn { display: inline-flex; }
  .primary-nav { display: none; }
  .header-inner { gap: 10px; }
  .brand-name { display: none; }
}
@media (max-width: 640px) {
  :root { --header-h: 52px; }
  .header-inner { gap: 8px; padding: 0 12px; }
  .brand-name { display: none; }
  .brand { margin-right: auto; }
  .container { padding: 0 12px; }
  .layout-narrow { padding: 12px; }

  /* 新版卡片移动端 */
  .thread-card-new { padding: 14px; }
  .tcn-header { margin-bottom: 8px; }
  .tcn-avatar { width: 36px; height: 36px; }
  .tcn-username { font-size: 13px; }
  .tcn-title { font-size: 15px; }
  .tcn-preview { font-size: 12px; -webkit-line-clamp: 2; }
  .tcn-imgs { gap: 4px; }
  .tcn-img { width: 72px; height: 72px; }
  .tcn-stats { gap: 8px; font-size: 11px; }
  .tcn-footer { gap: 6px; }

  /* 旧版兼容（逐步移除） */
  .card { padding: 12px; }
  .card-avatar { width: 38px; height: 38px; }
  .card-title { font-size: 15px; }
  .card-content { font-size: 13px; -webkit-line-clamp: 2; }
  .card-imgs-1 { max-width: 160px; }
  .card-imgs-2 { max-width: 200px; }
  .card-imgs-3, .card-imgs-4, .card-imgs-5, .card-imgs-6, .card-imgs-7, .card-imgs-8, .card-imgs-9 { max-width: 240px; }
  .td-title { font-size: 18px; }
  .td-content { font-size: 14px; }
  .profile-header { flex-direction: column; align-items: center; text-align: center; padding: 20px 16px; }
}

/* ---------- Animations ---------- */
@media (prefers-reduced-motion: no-preference) {
  .card { transition: border-color 0.15s var(--ease), transform 0.2s var(--ease); }
}

/* ---------- Forums page ---------- */
.forums-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.forum-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow 0.2s var(--ease), transform 0.15s var(--ease);
}
.forum-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.forum-card-icon {
  flex-shrink: 0;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-soft);
  border-radius: var(--radius-sm);
}

.forum-card-body { flex: 1; min-width: 0; }
.forum-card-name {
  font-size: 15px; font-weight: 600;
  margin: 0 0 4px 0;
}
.forum-card-desc {
  font-size: 12px; color: var(--color-text-3);
  margin: 0 0 2px 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.forum-card-count {
  font-size: 11px; color: var(--color-text-2);
}

.forum-card-arrow {
  flex-shrink: 0;
  color: var(--color-text-3);
  transition: transform 0.2s var(--ease);
}
.forum-card:hover .forum-card-arrow { transform: translateX(3px); }

/* ---------- Notifications page ---------- */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 64px 24px;
  color: var(--color-text-3);
  text-align: center;
}
.empty-state p { margin: 12px 0 0; font-size: 14px; }

.notification-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-2);
  font-size: 14px;
}
.notification-card.is-empty {
  justify-content: center;
  color: var(--color-text-3);
}

@media (max-width: 640px) {
  .forums-grid { grid-template-columns: 1fr; }
  .empty-state { padding: 48px 16px; }
}

/* ---------- Profile tabs ---------- */
.profile-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 16px;
}
.profile-tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-2);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}
.profile-tab:hover { color: var(--color-primary); }
.profile-tab.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- Modal ---------- */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  align-items: center; justify-content: center;
  padding: 16px;
}
.modal-overlay.is-open { display: flex; }
.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 420px;
  box-shadow: var(--shadow-lg);
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}
.modal-head h3 { font-size: 16px; }
.modal-close {
  width: 32px; height: 32px; border: none; background: transparent;
  border-radius: var(--radius-sm); cursor: pointer;
  color: var(--color-text-3);
  display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--color-surface-2); color: var(--color-text); }
.modal-body { padding: 20px; }
.modal-body .input { width: 100%; padding: 10px 12px; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: 14px; }
.modal-error { color: var(--color-danger); font-size: 13px; margin-top: 8px; min-height: 18px; }
.modal-foot {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--color-border);
}