/* Trendigger — card-style UI. Mobile-first, no framework. */

:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-alt: #f7f8fa;
  --border: #e4e6eb;
  --text: #1c1e21;
  --text-muted: #65676b;
  --accent: #ff4500;       /* reddit-ish orange */
  --accent-ink: #ffffff;
  --link: #1a73e8;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 2px 8px rgba(0,0,0,.04);
  --radius: 12px;
  --maxw: 1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --surface: #16181d;
    --surface-alt: #1c1f25;
    --border: #2a2e35;
    --text: #e6e7e9;
    --text-muted: #9aa0a6;
    --link: #8ab4f8;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 14px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    "Noto Sans JP", "Noto Sans KR", "Noto Sans TC", "Noto Sans Thai",
    "Noto Sans Arabic", Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 16px 60px;
}

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(1.2) blur(8px);
}
header.site .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex; align-items: center; gap: 16px;
  padding: 12px 16px;
}
header.site .brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
header.site .brand .dot { color: var(--accent); }
header.site nav {
  margin-left: auto;
  display: flex; gap: 14px; align-items: center;
  font-size: 14px;
}
/* region picker 自定义下拉（SVG 国旗 + 当前地区名，替代原 select） */
.region-picker { position: relative; }
.region-trigger {
  display: inline-flex; align-items: center; gap: 6px;
  font: inherit; font-size: 14px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  cursor: pointer;
}
.region-trigger:hover { border-color: var(--accent); }
.region-trigger .region-flag { display: inline-flex; }
.region-trigger .region-name { max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.region-trigger .caret { opacity: .6; flex-shrink: 0; transition: transform .15s; }
.region-picker.open .caret { transform: rotate(180deg); }
.region-menu {
  position: absolute; top: calc(100% + 4px); right: 0;
  min-width: 220px; max-width: 320px;
  max-height: 60vh;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 20;
  padding: 4px;
  display: flex; flex-direction: column; gap: 4px;
}
.region-search {
  width: 100%; box-sizing: border-box;
  margin: 0;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit; font-size: 14px;
  background: var(--surface);
  color: var(--text);
}
.region-search:focus { outline: none; border-color: var(--accent); }
.region-list {
  overflow-y: auto;
  flex: 1; min-height: 0;
  display: grid; gap: 1px;
}
.region-menu[hidden] { display: none; }
.region-option {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
}
.region-option:hover { background: var(--surface-alt); }
.region-option.current { background: var(--accent); color: var(--accent-ink); font-weight: 600; }

h1.page-title {
  font-size: 24px;
  margin: 8px 0 4px;
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
}
h1.page-title .flag { font-size: 28px; }
/* flag-icons SVG 国旗：跨平台一致显示（Windows 也能正常出图）。
   .fi 尺寸继承自父级 font-size；这里只做对齐。 */
.fi, .fi-emoji { vertical-align: middle; line-height: 1; }
.geo-flag .fi, .geo-flag .fi-emoji { vertical-align: -2px; }
.page-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 20px;
}

/* Indexable prose paragraph (SEO lede under the title) */
.seo-lede {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.6;
  max-width: 760px;
  margin: 0 0 18px;
}
.seo-lede a { color: var(--link); }

/* Date nav bar */
.datebar {
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
  margin: 12px 0 20px;
}
.datebar a, .datebar span {
  font-size: 13px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-muted);
}
.datebar a:hover { background: var(--bg); color: var(--text); text-decoration: none; }
.datebar .current { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.datebar .datepicker {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.datebar .datepicker input[type="date"] {
  font: inherit;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  color-scheme: light dark;
}

/* Language switcher (geo / keyword pages: local language <-> English) */
.lang-switch {
  display: flex;
  gap: 6px;
  align-items: center;
  margin: 0 0 10px;
  font-size: 13px;
}
.lang-switch a {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-muted);
  text-decoration: none;
}
.lang-switch a:hover { background: var(--bg); color: var(--text); }

/* Trend grid */
.trend-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 720px) {
  .trend-grid { grid-template-columns: repeat(2, 1fr); }
}
/* 首页 tab 内单列竖排：card 高度由内容决定（无 news 的自然矮） */
.trend-grid--single { grid-template-columns: 1fr; }

/* tab 面板：hidden 时完全不占空间 */
.tab-panel[hidden] { display: none; }

/* 首页时间桶单列竖排：每个 4h 时间段占一整列，按时间顺序上下堆叠 */
html { scroll-behavior: smooth; }
section.bucket { scroll-margin-top: 80px; }
.bucket-pairs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
/* 每个时间段标题右侧的 back / next 跳转按钮 */
.bucket-nav {
  display: inline-flex;
  gap: 8px;
  margin-left: auto;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}
.bucket-nav-btn {
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.bucket-nav-btn:hover {
  color: var(--text);
  border-color: var(--accent, var(--border));
  background: var(--surface-hover, var(--surface));
}
.bucket-nav-btn.is-disabled {
  opacity: 0.4;
  pointer-events: none;
}
/* 视口外卡片跳过 layout/paint，降低长列表首屏渲染成本 */
.bucket-pairs .card {
  content-visibility: auto;
  contain-intrinsic-size: auto 200px;
}

/* Show more button (homepage buckets) */
.btn-show-more {
  display: block;
  margin: 24px auto 0;
  padding: 12px 28px;
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn-show-more:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.hidden-trend {
  display: none;
}

/* Trend card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.card .head {
  display: flex; gap: 14px;
  padding: 14px 14px 10px;
}
.card .thumb {
  width: 84px; height: 84px;
  flex-shrink: 0;
  border-radius: 10px;
  background: var(--surface-alt);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  font-size: 26px;
  font-weight: 700;
}
.card .thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
}
/* Lazy images: keep the neutral placeholder box until data-src is swapped in.
   Avoids a broken-image icon flash before the real image loads. */
img.lazy-img { background: var(--surface-alt); color: transparent; }
.tier[hidden] { display: none !important; }
.card .head-text { flex: 1; min-width: 0; }
.card .rank {
  display: inline-block;
  font-size: 12px; font-weight: 700;
  color: var(--text-muted);
  margin-right: 6px;
}
.card .geo-flag {
  font-size: 14px;
  margin-right: 4px;
  vertical-align: -1px;
  cursor: help;
}
.card h2 {
  font-size: 17px;
  line-height: 1.3;
  margin: 0 0 6px;
  word-break: break-word;
}
.card h2 a { color: var(--text); }
.card .meta {
  display: flex; flex-wrap: wrap; gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}
.badge {
  display: inline-flex; align-items: center;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
}
.badge.hot {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
  font-weight: 600;
}

.card .intro {
  padding: 0 14px 10px;
  font-size: 14px;
  color: var(--text);
}
.card .intro.no-intro {
  color: var(--text-muted);
  font-style: italic;
}
.card .news {
  padding: 10px 14px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
}
.card .news h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  margin: 0 0 6px;
  font-weight: 600;
}
.card .news ul {
  margin: 0; padding: 0; list-style: none;
  display: grid; gap: 6px;
}
.card .news li {
  font-size: 13px;
  line-height: 1.4;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.card .news li img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}
.card .news li a {
  line-height: 1.3;
}
.card .news .src {
  color: var(--text-muted);
  font-size: 12px;
}
.card .breakdown {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
}
.card .breakdown h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  margin: 0 0 6px;
  font-weight: 600;
}
.card .breakdown ul {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-wrap: wrap; gap: 6px;
}
.card .breakdown li {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.card .footer {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* Compact card for home page */
.compact {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.compact h3 {
  margin: 0 0 10px;
  font-size: 15px;
  display: flex; align-items: center; gap: 8px;
}
.compact h3 .flag { font-size: 20px; }
.compact ol {
  margin: 0; padding-left: 20px;
  display: grid; gap: 4px;
  font-size: 14px;
}
.compact ol li a { color: var(--text); }
.compact .see-all {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
}
.home-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 640px) {
  .home-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .home-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Keyword detail page */
.detail-intro {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.detail-intro p {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
}
.keyword-geos {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
}
.keyword-geos .muted { color: var(--text-muted); margin-right: 4px; }
.keyword-geos .flag-link {
  display: inline-flex;
  text-decoration: none;
  font-size: 22px;
  line-height: 1;
  filter: grayscale(0.15);
  transition: filter 0.15s, transform 0.15s;
}
.keyword-geos .flag-link:hover { filter: grayscale(0); transform: scale(1.15); }
.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 14px 0 24px;
}
@media (min-width: 640px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.stat .label {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: .05em;
}
.stat .value {
  font-size: 18px;
  font-weight: 700;
  margin-top: 2px;
  word-break: break-word;
}

.timeline {
  display: grid; gap: 8px;
}
.timeline .row {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 14px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}
.timeline .row .bar {
  height: 8px;
  background: var(--accent);
  border-radius: 4px;
  opacity: .85;
}

h2.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 17px;
  margin: 28px 0 12px;
  color: var(--text);
}

footer.site {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
  padding: 18px 16px;
  text-align: center;
}
footer.site a { color: var(--text-muted); }

/* Sidebar toggle button (hamburger) */
.sidebar-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-alt);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-right: 10px;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
  align-self: center;
  line-height: 1;
  padding: 0;
}
.sidebar-toggle:hover { background: var(--surface-alt); border-color: var(--accent); }
.sidebar-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.sidebar-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.sidebar-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.sidebar-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 300px;
  max-width: 80vw;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  box-shadow: 4px 0 20px rgba(0,0,0,0.1);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.sidebar.open { transform: translateX(0); }
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}
.sidebar-title {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.sidebar-title .dot { color: var(--accent); }
.sidebar-close {
  background: none;
  border: none;
  font-size: 28px;
  color: var(--text-muted);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
.sidebar-close:hover { background: var(--surface-alt); color: var(--text); }
.sidebar-intro {
  padding: 16px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
  border-bottom: 1px solid var(--border);
}
.sidebar-nav {
  display: flex;
  flex-direction: column;
  padding: 10px 0;
  flex: 1;
}
.sidebar-nav a {
  padding: 10px 18px;
  color: var(--text);
  font-size: 15px;
  border-left: 3px solid transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.sidebar-nav a:hover {
  background: var(--surface-alt);
  border-left-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}
.sidebar-footer {
  padding: 14px 18px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Sidebar overlay */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.sidebar-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* Keyword actions & share buttons */
.keyword-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 12px 0 20px;
  padding: 12px 16px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.keyword-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.keyword-actions .btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}
.keyword-actions .btn-google {
  background: #4285f4;
  color: #fff;
  border-color: #4285f4;
}
.keyword-actions .btn-google:hover {
  background: #3367d6;
  border-color: #3367d6;
  color: #fff;
}
.share-buttons {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  flex-wrap: wrap;
}
.share-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-right: 4px;
}
.btn-share {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn-share:hover {
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-twitter { color: #fff; background: #000; border-color: #000; }
.btn-twitter:hover { background: #333; border-color: #333; color: #fff; }
.btn-facebook { color: #fff; background: #1877f2; border-color: #1877f2; }
.btn-facebook:hover { background: #1666d6; border-color: #1666d6; color: #fff; }
.btn-linkedin { color: #fff; background: #0a66c2; border-color: #0a66c2; }
.btn-linkedin:hover { background: #094d94; border-color: #094d94; color: #fff; }
.btn-copy { font-size: 14px; }
.btn-copy:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Card action icons */
.card-actions {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
}
.icon-btn:hover {
  background: var(--surface-alt);
  color: var(--accent);
  text-decoration: none;
}

/* Arabic / RTL support: applied when <html dir="rtl"> */
[dir="rtl"] .card .head { flex-direction: row-reverse; }
[dir="rtl"] .timeline .row { direction: rtl; }
[dir="rtl"] .sidebar-toggle { margin-right: 0; margin-left: 10px; }
[dir="rtl"] .brand { margin-right: auto; }
[dir="rtl"] .sidebar { left: auto; right: 0; border-left: 1px solid var(--border); border-right: none; transform: translateX(100%); }
[dir="rtl"] .sidebar.open { transform: translateX(0); }
[dir="rtl"] .sidebar-nav a { border-left: none; border-right: 3px solid transparent; }
[dir="rtl"] .sidebar-nav a:hover { border-right-color: var(--accent); }
[dir="rtl"] .share-buttons { margin-left: 0; margin-right: auto; }

/* Static content pages (about, terms, etc.) */
.static-page h1 {
  font-size: 28px;
  margin: 20px 0 12px;
}
.static-page h2 {
  font-size: 18px;
  margin: 24px 0 10px;
}
.static-page p {
  margin: 0 0 12px;
  line-height: 1.7;
  color: var(--text);
}
.static-page ul, .static-page ol {
  padding-left: 22px;
  margin: 0 0 12px;
  line-height: 1.7;
}
.static-page a { color: var(--link); }
.static-page .back-link {
  display: inline-block;
  margin: 16px 0;
  font-size: 14px;
  color: var(--text-muted);
}