:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
}

h1,
h2,
h3,
p {
  margin: 0;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(120deg, #eef2ff, #f8fafc);
}

.brand h1 {
  font-size: 24px;
  letter-spacing: -0.01em;
}

.subtitle {
  color: var(--muted);
  margin-top: 4px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.chip-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-group button {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chip-group button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}

.chip-group button:hover {
  border-color: var(--accent);
}

.label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.hint {
  color: var(--muted);
  font-size: 13px;
}

.search input {
  min-width: 200px;
  padding: 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
}

.layout {
  max-width: 1200px;
  margin: 20px auto 40px;
  padding: 0 16px;
  display: grid;
  gap: 18px;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.list ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 6px;
}

.row {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
}

.row:hover {
  border-color: var(--accent);
}

.rank {
  font-weight: 700;
  color: var(--muted);
}

.keyword-btn {
  background: transparent;
  border: none;
  text-align: left;
  color: var(--text);
  font-size: 15px;
  cursor: pointer;
  padding: 0;
}

.metric {
  font-variant-numeric: tabular-nums;
  color: var(--text);
  font-weight: 600;
}

.detail {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.headline {
  font-size: 22px;
  letter-spacing: -0.02em;
}

.status {
  text-align: right;
}

.chart-wrap {
  width: 100%;
}

#trendChart {
  width: 100%;
  height: 280px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.empty {
  padding: 12px;
  color: var(--muted);
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: #fff;
}

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
  }

  .controls {
    align-items: flex-start;
  }

  .row {
    grid-template-columns: 24px 1fr auto;
  }

  .footer {
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
  }
}