:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #161b22;
  --muted: #64707d;
  --line: #dfe5ea;
  --line-strong: #c7d0d8;
  --brand: #0097a7;
  --brand-dark: #065f68;
  --warm: #ff6b4a;
  --gold: #f59e0b;
  --shadow: 0 18px 42px rgba(20, 31, 43, 0.09);
  --container: min(1400px, calc(100vw - 36px));
  --font: "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: linear-gradient(180deg, #eef4f6 0%, var(--bg) 280px);
}

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

button,
input,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px max(18px, calc((100vw - 1400px) / 2));
  background: rgba(0, 151, 167, 0.95);
  color: #fff;
  box-shadow: 0 10px 28px rgba(4, 84, 94, 0.18);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: #fff;
  color: var(--brand-dark);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.78);
}

.quick-search {
  display: grid;
  grid-template-columns: 104px minmax(180px, 360px) 78px;
  border-radius: 9px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(255, 255, 255, 0.34);
}

.quick-search select,
.quick-search input,
.quick-search button,
.toolbar input {
  border: 0;
  outline: 0;
}

.quick-search select {
  padding: 0 12px;
  color: var(--ink);
  background: #eef4f6;
}

.quick-search input {
  min-width: 0;
  padding: 12px 14px;
}

.quick-search button,
#refreshButton {
  border: 0;
  background: #14343b;
  color: #fff;
  font-weight: 700;
}

main {
  width: var(--container);
  margin: 0 auto;
  padding: 26px 0 64px;
}

.summary-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 28px;
  align-items: end;
  padding: 18px 0 26px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 620px;
  font-size: clamp(28px, 3.5vw, 46px);
  line-height: 1.12;
  letter-spacing: 0;
}

.summary-copy p {
  max-width: 720px;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.summary-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.summary-panel div {
  padding: 24px 20px;
  border-left: 1px solid var(--line);
}

.summary-panel div:first-child {
  border-left: 0;
}

.summary-panel span,
.summary-panel small {
  display: block;
}

.summary-panel span {
  min-height: 32px;
  color: var(--warm);
  font-size: 28px;
  font-weight: 800;
}

.summary-panel small {
  margin-top: 8px;
  color: var(--muted);
}

.toolbar {
  position: sticky;
  top: 74px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  background: rgba(244, 246, 248, 0.88);
  backdrop-filter: blur(12px);
}

.filters,
.source-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip,
.source-toggle {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  background: #fff;
  color: var(--muted);
}

.chip.active,
.source-toggle.active {
  border-color: var(--brand);
  background: #e6f7f9;
  color: var(--brand-dark);
  font-weight: 800;
}

.toolbar-actions {
  display: grid;
  grid-template-columns: minmax(180px, 280px) 84px;
  gap: 8px;
}

.toolbar input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
}

#refreshButton {
  border-radius: 8px;
}

.source-picker {
  margin: 6px 0 18px;
}

.status-line {
  min-height: 24px;
  margin: 2px 0 14px;
  color: var(--muted);
  font-size: 14px;
}

.trend-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.trend-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent, var(--brand));
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 10px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.source-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 7px;
  background: var(--accent, var(--brand));
  color: #fff;
  font-weight: 800;
}

.card-title h2 {
  overflow: hidden;
  margin: 0;
  font-size: 20px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-meta {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.trend-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0 18px 18px;
  list-style: none;
}

.trend-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 34px;
  border-top: 1px solid #edf1f4;
}

.rank {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 5px;
  background: #98a2ad;
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}

.rank.top-1 {
  background: #ef4444;
}

.rank.top-2 {
  background: #f59e0b;
}

.rank.top-3 {
  background: #3b82f6;
}

.topic {
  overflow: hidden;
  color: #2f3943;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topic:hover {
  color: var(--brand-dark);
}

.hot {
  color: #ff4f55;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  font-weight: 800;
}

.empty {
  padding: 34px 18px;
  color: var(--muted);
  text-align: center;
}

.backtop {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  box-shadow: var(--shadow);
}

@media (max-width: 1100px) {
  .summary-band {
    grid-template-columns: 1fr;
  }

  .summary-panel {
    max-width: 560px;
  }

  .trend-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .topbar,
  .toolbar {
    position: static;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .quick-search,
  .toolbar-actions {
    grid-template-columns: 94px minmax(0, 1fr) 70px;
  }

  .toolbar {
    flex-direction: column;
  }

  .toolbar-actions {
    grid-template-columns: minmax(0, 1fr) 74px;
  }

  .summary-panel {
    grid-template-columns: 1fr;
  }

  .summary-panel div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .summary-panel div:first-child {
    border-top: 0;
  }

  .trend-grid {
    grid-template-columns: 1fr;
  }
}