:root {
  --bg: #eef1f0; --surface: #ffffff; --ink: #18232a; --muted: #5b6870; --line: #d5dcda;
  --accent: #1e5a80; --ok: #2b8a62; --warn: #b7791f; --crit: #c0392b; --none: #a7b1b5;
  --ok-bg: #e3f2ea; --warn-bg: #fbf0dc; --crit-bg: #f9e2df;
  --font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "Segoe UI", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12181c; --surface: #1a2227; --ink: #e4eaec; --muted: #92a0a8; --line: #2c373d;
    --accent: #6fa8d0; --ok: #49b888; --warn: #e0a33a; --crit: #e5604f; --none: #4a565c;
    --ok-bg: #173126; --warn-bg: #352a14; --crit-bg: #3a1d19;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { font-size: 15px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); line-height: 1.5;
       font-variant-numeric: tabular-nums; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1 { font-size: 1.45rem; font-weight: 650; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; font-weight: 650; margin: 2rem 0 0.6rem; }
h3 { font-size: 0.95rem; font-weight: 600; margin: 1.2rem 0 0.4rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

/* 상단 */
header { display: flex; align-items: center; gap: 2rem; padding: 0 1.5rem; height: 3.4rem;
         background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 750; color: var(--ink); letter-spacing: 0.02em; }
.brand span { font-weight: 400; color: var(--muted); margin-left: 0.5rem; letter-spacing: 0; }
nav { display: flex; gap: 0.2rem; flex: 1; }
nav a { color: var(--muted); padding: 0.35rem 0.7rem; border-radius: 4px; }
nav a.on { color: var(--ink); background: var(--bg); font-weight: 600; }
nav a:hover { text-decoration: none; color: var(--ink); }
.who { display: flex; gap: 1rem; align-items: center; font-size: 0.85rem; color: var(--muted); }
main { max-width: 1240px; margin: 0 auto; padding: 1.6rem 1.5rem 4rem; }

/* 공통 요소 */
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: 1px solid var(--line); background: var(--surface); padding: 0.4rem 0.9rem; border-radius: 4px; }
button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--crit); }
button.link { border: 0; background: none; padding: 0; color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }
input, select, textarea { border: 1px solid var(--line); background: var(--surface); padding: 0.4rem 0.6rem; border-radius: 4px; }
label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.2rem; }
.err { color: var(--crit); font-size: 0.9rem; min-height: 1.3em; }
.row { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }
.spread { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 1rem 1.2rem; }
.scroll { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; background: var(--surface); }
th, td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { font-size: 0.8rem; font-weight: 600; color: var(--muted); background: var(--surface); }
td.wrap { white-space: normal; }
td.num, th.num { text-align: right; }
tr.click { cursor: pointer; }
tr.click:hover td { background: var(--bg); }
.tablewrap { border: 1px solid var(--line); border-radius: 6px; overflow-x: auto; }
.tablewrap tr:last-child td { border-bottom: 0; }

/* 상태 표시 */
.st { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: 600; font-size: 0.85rem; }
.st::before { content: ""; width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--none); }
.st.ok::before { background: var(--ok); } .st.warn::before { background: var(--warn); } .st.crit::before { background: var(--crit); }
.st.ok { color: var(--ok); } .st.warn { color: var(--warn); } .st.crit { color: var(--crit); }
.tag { display: inline-block; font-size: 0.75rem; padding: 0.05rem 0.45rem; border-radius: 3px; border: 1px solid var(--line); color: var(--muted); }
.tag.new { border-color: var(--accent); color: var(--accent); }
.tag.maintenance { border-color: var(--warn); color: var(--warn); }
.reason { font-size: 0.85rem; }
.reason.crit { color: var(--crit); } .reason.warn { color: var(--warn); } .reason.info { color: var(--muted); }
.v-warn { color: var(--warn); font-weight: 600; } .v-crit { color: var(--crit); font-weight: 600; }

/* 현황: 관측소 띠 */
.strip { display: grid; grid-template-columns: repeat(auto-fill, minmax(8.2rem, 1fr)); gap: 0.5rem; margin-top: 1rem; }
.station { display: block; color: var(--ink); background: var(--surface); border: 1px solid var(--line);
           border-left: 0.45rem solid var(--none); border-radius: 0 5px 5px 0; padding: 0.55rem 0.7rem; }
.station:hover { text-decoration: none; border-color: var(--muted); }
.station.ok { border-left-color: var(--ok); } .station.warn { border-left-color: var(--warn); background: var(--warn-bg); }
.station.crit { border-left-color: var(--crit); background: var(--crit-bg); }
.station.retired, .station.maintenance { opacity: 0.65; }
.station b { display: block; font-size: 1.05rem; }
.station span { display: block; font-size: 0.8rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.figures { display: flex; gap: 2.5rem; flex-wrap: wrap; margin: 1.4rem 0 0; }
.figures div { min-width: 7rem; }
.figures b { display: block; font-size: 1.35rem; font-weight: 650; }
.figures span { font-size: 0.8rem; color: var(--muted); }

/* 그래프 */
.charts { display: grid; grid-template-columns: 1fr; gap: 16px; }
.chart { padding: 0.8rem 18px; }
.chart svg { width: 100%; height: auto; display: block; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .axis { fill: var(--muted); font-size: 11px; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.chart .thr-warn { stroke: var(--warn); stroke-dasharray: 4 4; }
.chart .thr-crit { stroke: var(--crit); stroke-dasharray: 4 4; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; padding: 0.25rem 0.7rem; font-size: 0.85rem; }
.seg button.on { background: var(--accent); color: #fff; }

/* 아카이브 히트맵 */
.heat { width: auto; }
.heat td { padding: 0; border: 0; }
.heat td.lbl { padding: 0.2rem 0.8rem 0.2rem 0; font-size: 0.85rem; }
.heat th { font-size: 0.7rem; padding: 0 0 0.3rem; text-align: center; font-weight: 400; }
.cell { display: block; width: 1.25rem; height: 1.25rem; margin: 1px; border-radius: 2px; background: var(--line); }
.cell.p100 { background: var(--ok); } .cell.p90 { background: color-mix(in srgb, var(--ok) 45%, var(--warn)); }
.cell.p50 { background: var(--warn); } .cell.p0 { background: var(--crit); }
.cell.open { opacity: 0.55; }
.legend { display: flex; gap: 1rem; font-size: 0.8rem; color: var(--muted); align-items: center; flex-wrap: wrap; }
.legend .cell { display: inline-block; vertical-align: middle; margin-right: 0.3rem; }
.bar { height: 0.55rem; background: var(--line); border-radius: 3px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); }

/* 상세 */
.kv { display: grid; grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr)); gap: 0.8rem 1.5rem; }
.kv .k { display: block; font-size: 0.8rem; color: var(--muted); }
.form { display: grid; grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr)); gap: 0.8rem 1rem; }
.form .full { grid-column: 1 / -1; }
.form input, .form textarea, .form select { width: 100%; }
.notice { background: var(--warn-bg); border: 1px solid var(--warn); border-radius: 6px; padding: 0.8rem 1rem; margin: 1rem 0; }
.secret { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.1rem; font-weight: 600; letter-spacing: 0.05em; }

/* 로그인 */
.auth { max-width: 22rem; margin: 12vh auto 0; }
.auth h1 { margin-bottom: 0.3rem; }
.auth form { display: grid; gap: 0.9rem; margin-top: 1.5rem; }
.auth input { width: 100%; padding: 0.55rem 0.7rem; }
.auth button { padding: 0.55rem; }

@media (max-width: 760px) {
  header { flex-wrap: wrap; height: auto; padding: 0.6rem 1rem; gap: 0.5rem 1rem; }
  nav { order: 3; flex-basis: 100%; overflow-x: auto; }
  main { padding: 1rem; }
  .figures { gap: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }