:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-alt: #f0f3f7;
  --text: #17202a;
  --muted: #657386;
  --line: #d9e0ea;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --warning: #a16207;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  letter-spacing: 0;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 6px;
  min-height: 36px;
  padding: 0 12px;
  cursor: pointer;
}

button:hover {
  border-color: #a9b7c8;
}

button.active,
button.primary,
#applyButton,
#refreshButton {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.active:hover,
button.primary:hover,
#applyButton:hover,
#refreshButton:hover {
  background: var(--accent-dark);
}

a {
  color: var(--accent-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.app {
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 5;
}

.topbar h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 720;
}

.topbar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.top-actions,
.filter-actions,
.panel-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
}

main {
  padding: 16px 24px 24px;
}

.filters {
  display: grid;
  grid-template-columns: minmax(260px, 2fr) minmax(120px, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

label {
  display: grid;
  gap: 6px;
}

label span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

input,
select {
  width: 100%;
  min-height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.metric {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  box-shadow: var(--shadow);
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.metric strong {
  display: block;
  margin-top: 4px;
  font-size: 22px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.workspace {
  display: block;
}

.results-panel {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.panel-head h2 {
  margin: 0;
  font-size: 15px;
}

.results-list {
  min-height: 280px;
}

.tweet-row,
.trend-row,
.empty-state {
  border-bottom: 1px solid var(--line);
  padding: 14px;
}

.tweet-meta,
.trend-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
}

.tweet-text {
  margin: 8px 0 10px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.counts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

.trend-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}

.trend-title strong {
  font-size: 16px;
}

.rank {
  color: var(--accent-dark);
  font-weight: 760;
}

.empty-state {
  color: var(--muted);
}

.more-button {
  display: none;
  width: calc(100% - 28px);
  margin: 14px;
}

.more-button.visible {
  display: block;
}

.error {
  color: #991b1b;
}

@media (max-width: 980px) {
  .filters {
    grid-template-columns: repeat(2, minmax(140px, 1fr));
  }

  .workspace {
    display: block;
  }
}

@media (max-width: 620px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .top-actions {
    justify-content: stretch;
  }

  .top-actions > * {
    flex: 1;
  }

  main {
    padding: 12px;
  }

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

  .filter-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}