/* Baltic GNSS Guard - light, readable teaching layout. */
:root {
  --bg: #ffffff;
  --panel: #f6f7f9;
  --ink: #1d1d1b;
  --muted: #5f5e5a;
  --border: rgba(128, 128, 128, 0.35);
  --accent: #1f63b5;
  --info-bg: #e8f1fc;
  --warn-bg: #fff6d6;
  --error-bg: #fde8e8;
  --ok-bg: #e5f4e5;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
h2 { margin-top: 2.2rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { margin-top: 1.4rem; }

.site-header { padding: 1rem 1.5rem 0.5rem; border-bottom: 1px solid var(--border); }
.site-header h1 { margin: 0; font-size: 1.6rem; }
.site-header p { margin: 0.2rem 0 0.4rem; color: var(--muted); }

.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); }
.sidebar {
  background: var(--panel);
  padding: 1rem;
  border-right: 1px solid var(--border);
  position: sticky; top: 0; align-self: start; height: 100vh; overflow-y: auto;
}
.sidebar label { display: block; font-weight: 600; margin: 0.8rem 0 0.25rem; }
.sidebar select, .sidebar button { width: 100%; padding: 0.4rem; font: inherit; }
.sidebar .toggle { font-weight: 400; display: flex; gap: 0.4rem; align-items: center; }
main { padding: 1rem 1.5rem 3rem; min-width: 0; }

button { cursor: pointer; border: 1px solid var(--border); background: #fff;
         border-radius: 6px; padding: 0.35rem 0.7rem; font: inherit; }
button:hover { border-color: var(--accent); }
.muted { color: var(--muted); font-size: 0.92rem; }
.caption { color: var(--muted); font-size: 0.88rem; margin: 0.2rem 0 1rem; }

.briefing { border: 1px solid var(--border); border-radius: 8px; padding: 0.6rem 1rem;
            margin-bottom: 1rem; background: var(--panel); }
.briefing summary { font-weight: 700; cursor: pointer; }

.tabs { display: flex; gap: 0.3rem; border-bottom: 1px solid var(--border); margin-bottom: 1rem; }
.tabs button { border: none; border-bottom: 3px solid transparent; border-radius: 0;
               background: none; padding: 0.5rem 0.9rem; }
.tabs button[aria-selected="true"] { border-bottom-color: var(--accent); font-weight: 700; }

.time-label { display: block; font-weight: 600; margin-top: 0.8rem; }
#time { width: 100%; }
.moments { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.6rem 0; }

.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.chart { width: 100%; min-height: 280px; }
.chart.tall { min-height: 560px; }

.metrics { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.metric .label { font-size: 0.9rem; }
.metric .value { font-size: 1.7rem; font-weight: 600; }
.metric .delta { display: inline-block; font-size: 0.82rem; border-radius: 10px;
                 padding: 0 0.5rem; background: #eee; }
.metric .delta.bad { background: var(--error-bg); color: #b42318; }

.table-wrap { overflow-x: auto; margin-top: 0.8rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { border: 1px solid var(--border); padding: 0.3rem 0.55rem; text-align: left; }
th { background: var(--panel); }
td.num { text-align: right; }

.note { border-radius: 6px; padding: 0.6rem 0.9rem; margin: 0.6rem 0; }
.note.info { background: var(--info-bg); }
.note.warn { background: var(--warn-bg); }
.note.error { background: var(--error-bg); }
.note.ok { background: var(--ok-bg); }

.card { border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.8rem;
        margin-bottom: 0.5rem; }
.card .head { font-weight: 600; }
.card .head .meta { font-weight: 400; color: var(--muted); }
.card .badge { color: #fff; border-radius: 4px; padding: 1px 6px; font-size: 0.8rem; margin-left: 8px; }

.banner { border-left: 14px solid; border-radius: 6px; padding: 0.6rem 1rem; }
.banner .state { font-size: 1.7rem; font-weight: 700; }
.banner .state small { font-size: 1rem; font-weight: 400; color: var(--ink); }

.playbook { display: grid; grid-template-columns: 3fr 2fr; gap: 1.2rem; }
.rules { border: 1px solid var(--border); border-radius: 8px; padding: 0.4rem 1rem; }
.progress { height: 10px; background: #e6e6e6; border-radius: 5px; overflow: hidden; }
.progress > div { height: 100%; background: var(--accent); }

.md table { margin: 0.6rem 0; }
.math { overflow-x: auto; padding: 0.3rem 0; }
.diagram svg { max-width: 760px; width: 100%; height: auto; }
.deriv { border: 1px solid var(--border); border-radius: 8px; padding: 0.4rem 1rem; margin-bottom: 0.6rem; }
.deriv summary { font-weight: 600; cursor: pointer; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--border); }
  .grid2, .playbook { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  main { padding: 1rem; }
}

/* --- Accessibility -------------------------------------------------------- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
           clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 1rem; top: -3rem; z-index: 10; background: #ffffff;
             padding: 0.5rem 0.9rem; border-radius: 6px; font-weight: 700; border: 2px solid #0b57d0; }
.skip-link:focus { top: 1rem; }
:focus-visible { outline: 3px solid #0b57d0; outline-offset: 2px; box-shadow: 0 0 0 5px #ffffff; }
main:focus { outline: none; }