:root {
  color-scheme: dark;
  --background: #0d1117;
  --surface: #151b24;
  --surface-soft: #1b2330;
  --border: #293445;
  --text: #edf2f7;
  --muted: #8d9aab;
  --accent: #63d6b0;
  --accent-strong: #36b98f;
  --warning: #f5bd67;
  --danger: #f07e85;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top left, #182638 0, var(--background) 40rem);
  color: var(--text);
  font-family: "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
}

.page-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 48px 0 56px; }
.page-header { display: flex; justify-content: space-between; gap: 24px; align-items: flex-start; margin-bottom: 28px; }
.eyebrow { color: var(--accent); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; margin: 0 0 8px; }
h1, h2, p { margin-top: 0; }
h1 { font-size: clamp(2rem, 5vw, 3.3rem); letter-spacing: -0.06em; margin-bottom: 12px; }
h2 { font-size: 1.2rem; letter-spacing: -0.04em; margin-bottom: 0; }
.subtitle, .panel-hint, footer { color: var(--muted); }
.subtitle { margin-bottom: 0; }

.status-badge { border: 1px solid var(--border); border-radius: 999px; padding: 9px 14px; font-size: 0.82rem; white-space: nowrap; }
.status-ok { color: var(--accent); background: rgba(99, 214, 176, 0.1); }
.status-stale { color: var(--warning); background: rgba(245, 189, 103, 0.1); }
.status-loading { color: var(--muted); }

.status-panel, .panel { background: rgba(21, 27, 36, 0.92); border: 1px solid var(--border); border-radius: 18px; box-shadow: 0 18px 45px rgba(0, 0, 0, 0.16); }
.status-panel { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; padding: 18px 22px; margin-bottom: 22px; }
.status-label { display: block; color: var(--muted); font-size: 0.76rem; margin-bottom: 6px; }
.status-panel strong { font-size: 0.94rem; }
.panel { padding: 24px; margin-bottom: 22px; }
.panel-heading { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 20px; }
.panel-hint { font-size: 0.78rem; }
.chart-wrap { overflow-x: auto; }
.chart-wrap svg { display: block; width: 100%; min-width: 620px; }
.chart-wrap-bar svg { min-height: 160px; }
.chart-wrap-trend svg { min-height: 320px; }

.content-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(260px, 0.85fr); gap: 22px; align-items: stretch; }
.content-grid .panel { margin-bottom: 0; }
.explanation-panel p { color: var(--muted); line-height: 1.7; }
.explanation-panel dl { margin: 28px 0 0; }
.explanation-panel dl div { border-top: 1px solid var(--border); padding: 14px 0; }
.explanation-panel dt { color: var(--muted); font-size: 0.78rem; margin-bottom: 5px; }
.explanation-panel dd { margin: 0; font-weight: 700; }

select { background: var(--surface-soft); border: 1px solid var(--border); border-radius: 9px; color: var(--text); padding: 9px 12px; max-width: 210px; }
.trend-summary { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--muted); font-size: 0.84rem; margin: -4px 0 12px; }
.trend-summary b { color: var(--text); }

.svg-axis { stroke: #526174; stroke-width: 1; }
.svg-grid { stroke: #293445; stroke-width: 1; stroke-dasharray: 4 5; }
.svg-label, .svg-value, .svg-axis-label { fill: var(--muted); font-size: 13px; }
.svg-value { fill: var(--accent); font-weight: 800; }
.svg-bar { fill: url(#missing); fill: var(--accent-strong); opacity: 0.9; }
.svg-retention-bar { fill: #8b9cf6; opacity: 0.9; }
.svg-line { fill: none; stroke: var(--accent); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.svg-point { fill: var(--surface); stroke: var(--accent); stroke-width: 3; }
.svg-empty { fill: var(--muted); font-size: 15px; }

.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; min-width: 760px; font-size: 0.88rem; }
th { color: var(--muted); font-size: 0.76rem; font-weight: 600; text-align: left; padding: 0 12px 12px; white-space: nowrap; }
td { border-top: 1px solid var(--border); padding: 14px 12px; white-space: nowrap; }
tr:hover td { background: rgba(99, 214, 176, 0.04); }
.rank-cell { color: var(--accent); font-weight: 800; }
.positive-cell { color: var(--accent); font-weight: 800; }
.title-cell, .retention-interval-cell { color: var(--muted); max-width: 300px; overflow: hidden; text-overflow: ellipsis; }
.empty-cell { color: var(--muted); text-align: center; padding: 32px; }
footer { font-size: 0.78rem; text-align: center; padding: 6px 0; }

@media (max-width: 760px) {
  .page-shell { width: min(100% - 20px, 1180px); padding-top: 28px; }
  .page-header { flex-direction: column; }
  .status-panel { grid-template-columns: repeat(2, 1fr); }
  .content-grid { grid-template-columns: 1fr; }
  .content-grid .panel { margin-bottom: 22px; }
  .panel { padding: 18px; }
}