/* ==========================================================
   Antenna Configurator — styles
   Dark by default; light via [data-theme="light"].
   ========================================================== */
:root {
  --bg: #0b1017;
  --bg-2: #111823;
  --panel: #151e2b;
  --panel-2: #1b2636;
  --line: #263346;
  --line-2: #33445c;
  --text: #e6edf6;
  --muted: #93a3b8;
  --faint: #66778e;
  --accent: #38bdf8;
  --accent-2: #0ea5e9;
  --accent-ink: #04111c;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --info: #a78bfa;
  --good-bg: rgba(52, 211, 153, .10);
  --warn-bg: rgba(251, 191, 36, .10);
  --bad-bg: rgba(248, 113, 113, .11);
  --info-bg: rgba(167, 139, 250, .10);
  --accent-bg: rgba(56, 189, 248, .10);
  --code-bg: #0a0f16;
  --shadow: 0 6px 24px rgba(0, 0, 0, .35);
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #f4f6f9;
  --bg-2: #eaeef4;
  --panel: #ffffff;
  --panel-2: #f3f6fa;
  --line: #d8dfe9;
  --line-2: #c3cedc;
  --text: #142030;
  --muted: #4f6077;
  --faint: #7a8aa0;
  --accent: #0369a1;
  --accent-2: #0284c7;
  --accent-ink: #ffffff;
  --good: #047857;
  --warn: #a16207;
  --bad: #b91c1c;
  --info: #6d28d9;
  --good-bg: rgba(4, 120, 87, .08);
  --warn-bg: rgba(161, 98, 7, .09);
  --bad-bg: rgba(185, 28, 28, .08);
  --info-bg: rgba(109, 40, 217, .07);
  --accent-bg: rgba(3, 105, 161, .08);
  --code-bg: #eef2f7;
  --shadow: 0 6px 20px rgba(20, 32, 48, .08);
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
code, kbd, pre { font-family: var(--mono); }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 5px; font-size: .9em; border: 1px solid var(--line); }
pre { margin: 0; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.7rem; letter-spacing: -.01em; }
h2 { font-size: 1.3rem; margin-top: 1.4em; }
h3 { font-size: 1.05rem; margin-top: 1.2em; }
p { margin: 0 0 .8em; }
ul, ol { margin: 0 0 .9em; padding-left: 1.3em; }
li { margin: .2em 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 1.5em 0; }
button, input, select, textarea { font: inherit; color: inherit; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 14px;
  padding: 10px 16px;
  background: color-mix(in srgb, var(--bg-2) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; background: var(--accent-bg); color: var(--accent); border: 1px solid var(--line); }
.freqbar { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); flex-wrap: wrap; justify-content: flex-end; }
.freqbar input[type=number] { width: 92px; text-align: right; font-family: var(--mono); padding: 5px 8px; }
.freqbar select { width: auto; padding: 5px 8px; }
.freqbar .presets { display: flex; gap: 4px; }
.freqbar .presets button { padding: 3px 8px; font-size: 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--panel); color: var(--muted); cursor: pointer; }
.freqbar .presets button:hover, .freqbar .presets button.on { color: var(--accent); border-color: var(--accent); }
.freqbar .lambda b { font-family: var(--mono); color: var(--accent); font-weight: 600; }
.icon-btn { width: 36px; height: 36px; border-radius: 9px; border: 1px solid var(--line); background: var(--panel); cursor: pointer; font-size: 17px; flex: none; }
.icon-btn:hover { border-color: var(--accent); }
.menu-btn { display: none; }

/* ---------- Layout ---------- */
.layout { display: flex; min-height: calc(100vh - 57px); }
.sidebar {
  width: 260px; flex: none;
  position: sticky; top: 57px; height: calc(100vh - 57px); overflow-y: auto;
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  padding: 14px 10px 30px;
}
.nav-group { margin-bottom: 16px; }
.nav-title { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); padding: 4px 10px; }
.nav-link { display: flex; align-items: center; gap: 9px; padding: 7px 10px; border-radius: 8px; color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-link:hover { background: var(--panel); color: var(--text); }
.nav-link.active { background: var(--accent-bg); color: var(--accent); font-weight: 600; }
.nav-link .ico { width: 20px; text-align: center; flex: none; }
.nav-link .tick { margin-left: auto; color: var(--good); font-size: 12px; }
.scrim { display: none; }
main { flex: 1; min-width: 0; padding: 28px clamp(16px, 4vw, 48px) 80px; outline: none; }
.page { max-width: 1120px; margin: 0 auto; }
.page.narrow { max-width: 860px; }

/* ---------- Generic UI ---------- */
.lead { font-size: 1.08rem; color: var(--muted); max-width: 72ch; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: var(--mono); }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.card + .card { margin-top: 16px; }
.card h3:first-child, .card h2:first-child { margin-top: 0; }
.grid { display: grid; gap: 16px; }
.grid.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.c4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.auto { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.split { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr); gap: 18px; align-items: start; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.btn { display: inline-flex; align-items: center; gap: 7px; padding: 8px 14px; border-radius: 9px; border: 1px solid var(--line-2); background: var(--panel-2); cursor: pointer; text-decoration: none; color: var(--text); font-weight: 600; font-size: 14px; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.tag { display: inline-block; font-size: 11.5px; font-weight: 600; padding: 2px 8px; border-radius: 99px; border: 1px solid var(--line-2); color: var(--muted); white-space: nowrap; }
.tag.good { color: var(--good); border-color: currentColor; }
.tag.warn { color: var(--warn); border-color: currentColor; }
.tag.bad { color: var(--bad); border-color: currentColor; }
.tag.info { color: var(--info); border-color: currentColor; }
.tag.accent { color: var(--accent); border-color: currentColor; }

/* Tiles (home / index pages) */
.tile { display: block; text-decoration: none; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; transition: border-color .15s, transform .15s; }
.tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.tile .t-ico { font-size: 22px; }
.tile h3 { margin: 6px 0 4px; font-size: 1rem; }
.tile p { margin: 0; color: var(--muted); font-size: 13.5px; }
.tile .meta { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }

/* Callouts */
.callout { border: 1px solid var(--line); border-left: 4px solid var(--accent); background: var(--accent-bg); border-radius: 10px; padding: 12px 14px; margin: 14px 0; }
.callout > :last-child { margin-bottom: 0; }
.callout .c-title { font-weight: 700; margin-bottom: 4px; display: flex; gap: 8px; align-items: center; }
.callout.good { border-left-color: var(--good); background: var(--good-bg); }
.callout.warn { border-left-color: var(--warn); background: var(--warn-bg); }
.callout.bad { border-left-color: var(--bad); background: var(--bad-bg); }
.callout.info { border-left-color: var(--info); background: var(--info-bg); }

/* Code block with copy */
.codeblock { position: relative; background: var(--code-bg); border: 1px solid var(--line); border-radius: 10px; margin: 10px 0; }
.codeblock pre { padding: 12px 14px; overflow-x: auto; font-size: 13px; line-height: 1.55; white-space: pre; }
.codeblock .copy { position: absolute; top: 6px; right: 6px; font-size: 11px; padding: 3px 8px; border-radius: 6px; border: 1px solid var(--line-2); background: var(--panel); cursor: pointer; color: var(--muted); }
.codeblock .copy:hover { color: var(--accent); border-color: var(--accent); }
.codeblock .c-cmt { color: var(--faint); }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th, td { padding: 8px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--panel-2); font-weight: 600; color: var(--muted); font-size: 12.5px; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.num { font-family: var(--mono); text-align: right; white-space: nowrap; }

/* ---------- Forms ---------- */
.form { display: grid; gap: 12px; }
.field { display: grid; gap: 4px; }
.field > label, .field > .lbl { font-size: 13px; color: var(--muted); font-weight: 600; display: flex; justify-content: space-between; gap: 8px; }
.field .help { font-size: 12px; color: var(--faint); }
.input-unit { display: flex; }
.input-unit input { border-top-right-radius: 0; border-bottom-right-radius: 0; flex: 1; min-width: 0; }
.input-unit .unit, .input-unit select { border: 1px solid var(--line-2); border-left: 0; background: var(--panel-2); padding: 0 10px; display: grid; place-items: center; border-radius: 0 8px 8px 0; color: var(--muted); font-size: 13px; white-space: nowrap; }
input[type=number], input[type=text], select, textarea {
  width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--bg); outline: none;
}
input[type=number] { font-family: var(--mono); }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
input[type=range] { width: 100%; accent-color: var(--accent); }
input[type=checkbox], input[type=radio] { accent-color: var(--accent); width: 16px; height: 16px; }
.checks { display: grid; gap: 6px; }
.check { display: flex; gap: 9px; align-items: flex-start; font-size: 14px; cursor: pointer; padding: 6px 8px; border-radius: 8px; border: 1px solid transparent; }
.check:hover { background: var(--panel-2); }
.check input { margin-top: 3px; flex: none; }
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 9px; overflow: hidden; flex-wrap: wrap; }
.seg button { border: 0; background: transparent; padding: 6px 12px; cursor: pointer; font-size: 13px; color: var(--muted); }
.seg button + button { border-left: 1px solid var(--line-2); }
.seg button.on { background: var(--accent); color: var(--accent-ink); font-weight: 600; }

/* ---------- Results ---------- */
.results { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.result { background: var(--panel-2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.result .r-label { font-size: 12px; color: var(--muted); }
.result .r-value { font-family: var(--mono); font-size: 1.15rem; font-weight: 700; color: var(--accent); margin-top: 2px; word-break: break-word; }
.result .r-sub { font-size: 11.5px; color: var(--faint); margin-top: 2px; }
.result.good .r-value { color: var(--good); }
.result.warn .r-value { color: var(--warn); }
.result.bad .r-value { color: var(--bad); }
.result.big { grid-column: 1 / -1; }
.result.big .r-value { font-size: 1.5rem; }
.verdict { padding: 12px 14px; border-radius: 10px; font-weight: 600; margin-top: 12px; border: 1px solid var(--line); }
.verdict.good { background: var(--good-bg); color: var(--good); }
.verdict.warn { background: var(--warn-bg); color: var(--warn); }
.verdict.bad { background: var(--bad-bg); color: var(--bad); }
.verdict span { display: block; color: var(--text); font-weight: 400; font-size: 13.5px; margin-top: 3px; }
.formula { font-family: var(--mono); font-size: 12.5px; color: var(--muted); background: var(--code-bg); border: 1px dashed var(--line-2); padding: 8px 10px; border-radius: 8px; margin-top: 12px; overflow-x: auto; white-space: pre-wrap; }

/* ---------- Canvas visualizers ---------- */
.viz-wrap { position: relative; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.viz-wrap canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.viz-legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: var(--muted); margin-top: 8px; }
.viz-legend i { display: inline-block; width: 12px; height: 3px; border-radius: 2px; vertical-align: middle; margin-right: 5px; }
.viz-overlay { position: absolute; left: 10px; top: 10px; font-size: 12px; color: var(--muted); background: color-mix(in srgb, var(--panel) 85%, transparent); border: 1px solid var(--line); padding: 4px 8px; border-radius: 7px; pointer-events: none; font-family: var(--mono); }

/* ---------- Mission planner ---------- */
.phase-rail { display: flex; gap: 6px; overflow-x: auto; padding: 4px 2px 10px; margin: 6px 0 4px; }
.phase-pill { flex: none; display: flex; align-items: center; gap: 8px; padding: 6px 12px 6px 6px; border-radius: 99px; border: 1px solid var(--line); background: var(--panel); font-size: 13px; color: var(--muted); text-decoration: none; cursor: pointer; }
.phase-pill .n { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 11.5px; font-weight: 700; background: var(--panel-2); border: 1px solid var(--line-2); }
.phase-pill.done { color: var(--good); border-color: var(--good); }
.phase-pill.done .n { background: var(--good); color: var(--accent-ink); border-color: var(--good); }
.phase-pill.blocked { color: var(--bad); border-color: var(--bad); }
.progress { height: 8px; background: var(--panel-2); border-radius: 99px; overflow: hidden; border: 1px solid var(--line); }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--accent-2), var(--good)); width: 0; transition: width .3s; }
.phase { margin-top: 26px; scroll-margin-top: 76px; }
.phase-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 10px; }
.phase-num { flex: none; width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; font-weight: 800; background: var(--accent-bg); color: var(--accent); border: 1px solid var(--line-2); font-size: 16px; }
.phase-head h2 { margin: 0; font-size: 1.25rem; }
.phase-head p { margin: 2px 0 0; color: var(--muted); font-size: 14px; }
.gate { font-size: 12.5px; color: var(--muted); margin: 0 0 10px 54px; }
.gate b { color: var(--text); }
.step { border: 1px solid var(--line); background: var(--panel); border-radius: 11px; margin: 8px 0 8px 54px; overflow: hidden; }
.step.done { border-color: color-mix(in srgb, var(--good) 45%, var(--line)); }
.step.done .s-title { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--faint); }
.step summary { list-style: none; display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; cursor: pointer; }
.step summary::-webkit-details-marker { display: none; }
.step summary .chev { margin-left: auto; color: var(--faint); transition: transform .15s; flex: none; }
.step[open] summary .chev { transform: rotate(90deg); }
.step summary input { margin-top: 4px; flex: none; width: 18px; height: 18px; }
.s-title { font-weight: 600; }
.s-why { font-size: 13px; color: var(--muted); margin-top: 1px; }
.step .s-body { padding: 0 16px 14px 44px; font-size: 14.5px; }
.step .s-body h4 { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--faint); margin: 14px 0 6px; }
.s-tags { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 6px; }
.s-links { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }
.blocker { border: 1px solid var(--bad); background: var(--bad-bg); border-radius: 11px; padding: 12px 14px; margin: 10px 0; }
.blocker b { color: var(--bad); }
.profile-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px 18px; }
.risk { display: grid; grid-template-columns: 28px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--line); }
.risk:last-child { border-bottom: 0; }
.risk .r-ico { font-size: 20px; }
.risk b { display: block; }
.risk span { font-size: 13.5px; color: var(--muted); }

/* Chain builder */
.chain { display: flex; align-items: stretch; gap: 0; overflow-x: auto; padding: 6px 0 12px; }
.chain-node { flex: none; min-width: 130px; max-width: 170px; background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 10px; padding: 8px 10px; font-size: 12.5px; }
.chain-node b { display: block; font-size: 13px; }
.chain-node .loss { font-family: var(--mono); color: var(--warn); }
.chain-arrow { flex: none; align-self: center; color: var(--faint); padding: 0 4px; }
.seg-row { display: grid; grid-template-columns: 1.5fr 1fr auto; gap: 8px; align-items: end; padding: 8px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel-2); }
.seg-row + .seg-row { margin-top: 8px; }

/* ---------- Lessons ---------- */
.lesson-body h2 { border-top: 1px solid var(--line); padding-top: 1.1em; }
.lesson-body h2:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.lesson-body img, .lesson-body svg.figure { max-width: 100%; }
.figure-wrap { background: var(--code-bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin: 12px 0; text-align: center; }
.figure-wrap figcaption { font-size: 12.5px; color: var(--muted); margin-top: 6px; }
.figure-wrap svg { max-width: 100%; height: auto; }
.keypoints { display: grid; gap: 8px; margin: 12px 0; }
.keypoints div { padding: 9px 12px 9px 36px; position: relative; background: var(--panel-2); border-radius: 9px; border: 1px solid var(--line); font-size: 14px; }
.keypoints div::before { content: "→"; position: absolute; left: 13px; color: var(--accent); font-weight: 700; }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 30px; flex-wrap: wrap; }

/* Glossary */
.gloss-item { padding: 12px 0; border-bottom: 1px solid var(--line); }
.gloss-item dt { font-weight: 700; }
.gloss-item dd { margin: 3px 0 0; color: var(--muted); font-size: 14px; }
.search { position: relative; }
.search input { padding-left: 34px; }
.search::before { content: "⌕"; position: absolute; left: 11px; top: 50%; transform: translateY(-52%); color: var(--faint); font-size: 18px; }

/* Hero */
.hero { padding: 26px 26px; border-radius: 16px; border: 1px solid var(--line); background:
  radial-gradient(1200px 300px at 0% 0%, var(--accent-bg), transparent 60%),
  radial-gradient(800px 300px at 100% 100%, var(--info-bg), transparent 60%), var(--panel); }
.hero h1 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); margin-bottom: 10px; }
.flow { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 14px 0 4px; }
.flow span { padding: 4px 10px; border-radius: 99px; background: var(--panel-2); border: 1px solid var(--line-2); font-size: 12.5px; font-weight: 600; }
.flow i { color: var(--faint); font-style: normal; }

.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--panel); border: 1px solid var(--accent); padding: 8px 14px; border-radius: 9px; box-shadow: var(--shadow); font-size: 13.5px; z-index: 99; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .grid.c4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .freqbar .presets { display: none; }
}
@media (max-width: 900px) {
  .split, .grid.c2, .grid.c3 { grid-template-columns: minmax(0, 1fr); }
  .menu-btn { display: block; }
  .sidebar { position: fixed; left: 0; top: 57px; z-index: 50; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow); }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: 57px 0 0 0; background: rgba(0,0,0,.4); z-index: 45; }
  .step, .gate { margin-left: 0; }
  .step .s-body { padding-left: 16px; }
}
@media (max-width: 640px) {
  .brand-text { display: none; }
  .freqbar label, .freqbar .lambda { display: none; }
  .grid.c4 { grid-template-columns: 1fr; }
  main { padding-top: 18px; }
  .seg-row { grid-template-columns: 1fr 1fr; }
}
@media print {
  .topbar, .sidebar, .s-links, .lesson-nav, .btn { display: none !important; }
  .step { break-inside: avoid; }
  .step .s-body { display: block !important; }
}

/* Embedded tools adapt to their card width, not the viewport */
.embed-body, #body { container-type: inline-size; }
@container (max-width: 860px) {
  .split, .grid.c2 { grid-template-columns: minmax(0, 1fr); }
}
@container (max-width: 520px) {
  .grid.c3 { grid-template-columns: minmax(0, 1fr); }
}
.seg-row .input-unit input { min-width: 60px; }

.grid > *, .split > * { min-width: 0; }