/* Khoomei course — steppe-night theme */
:root {
  --bg: #0d1120;
  --bg-2: #111629;
  --panel: #161d36;
  --panel-2: #1b2340;
  --line: #2a3354;
  --line-soft: #222b4a;
  --text: #f2ede3;
  --muted: #a8b0cc;
  --faint: #7c85a6;
  --amber: #e8a33d;
  --amber-soft: rgba(232, 163, 61, 0.14);
  --amber-line: rgba(232, 163, 61, 0.4);
  --sky: #8fc1e3;
  --sky-soft: rgba(143, 193, 227, 0.12);
  --good: #7fc98b;
  --good-soft: rgba(127, 201, 139, 0.13);
  --bad: #e0705e;
  --bad-soft: rgba(224, 112, 94, 0.12);
  --key-soft: rgba(143, 193, 227, 0.12);
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sidebar-w: 292px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(232, 163, 61, 0.07), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(143, 193, 227, 0.05), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: #14100a;
  padding: 8px 14px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

::selection { background: rgba(232, 163, 61, 0.35); }

/* ---------- layout ---------- */
#app { display: flex; min-height: 100vh; }

#sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--bg-2), #0b0f1c);
  border-right: 1px solid var(--line-soft);
  padding: 22px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.brand { display: flex; align-items: center; gap: 12px; padding: 2px 8px; }
.brand-mark { color: var(--amber); flex: 0 0 auto; animation: spin-slow 40s linear infinite; }
@keyframes spin-slow { to { transform: rotate(360deg); } }
.brand-text h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: 0.04em;
  font-weight: 600;
  line-height: 1.1;
}
.brand-text p { margin: 2px 0 0; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--faint); }

.progress-wrap { padding: 0 8px; }
.progress-row { display: flex; justify-content: space-between; font-size: 0.78rem; color: var(--muted); margin-bottom: 6px; }
#progress-pct { color: var(--amber); font-weight: 600; }
.progress-track {
  height: 8px;
  border-radius: 99px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 99px;
  background: linear-gradient(90deg, #b97a24, var(--amber));
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.lesson-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 10px;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font: inherit;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.nav-item:hover { background: var(--panel); color: var(--text); }
.nav-item.active {
  background: var(--amber-soft);
  border-color: var(--amber-line);
  color: var(--text);
}
.nav-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  color: var(--faint);
}
.nav-item.active .nav-icon { background: rgba(232, 163, 61, 0.18); color: var(--amber); border-color: var(--amber-line); }
.nav-icon svg { width: 16px; height: 16px; }
.nav-label { flex: 1; min-width: 0; }
.nav-label .n { display: block; font-size: 0.68rem; color: var(--faint); letter-spacing: 0.08em; }
.nav-label .t { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-check {
  width: 18px; height: 18px; flex: 0 0 auto;
  color: var(--good);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.25s, transform 0.25s;
}
.nav-item.done .nav-check { opacity: 1; transform: scale(1); }
.nav-item.done .nav-label .t { color: var(--muted); }

.sidebar-foot { display: flex; gap: 8px; }
.stat {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  text-align: center;
}
.stat-num { display: block; font-size: 1.15rem; font-weight: 700; color: var(--amber); line-height: 1.1; }
.stat-unit { font-size: 0.66rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; }

.main-wrap { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 26px;
  background: rgba(13, 17, 32, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-toggle { display: none; }
.topbar-course { flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 10px; }
.topbar-title { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; }
.topbar-sub { color: var(--faint); font-size: 0.82rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--line-soft);
  color: var(--faint);
  font: inherit;
  font-size: 0.78rem;
  padding: 5px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.ghost-btn:hover { color: var(--text); border-color: var(--line); }

#main { flex: 1; padding: 40px 34px 90px; }
.lesson {
  max-width: 790px;
  margin: 0 auto;
  animation: lesson-in 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes lesson-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.lesson-header { margin-bottom: 34px; }
.lesson-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
}
.lesson-kicker .dot { width: 4px; height: 4px; border-radius: 99px; background: var(--amber); }
.lesson h1 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.4vw, 2.9rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0.01em;
}
.lesson-sub {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.55;
  max-width: 60ch;
}
.lesson-meta { display: flex; gap: 14px; margin-top: 14px; color: var(--faint); font-size: 0.8rem; }
.lesson-meta span { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- prose ---------- */
.lesson p { margin: 0 0 1.05em; max-width: 68ch; }
.lesson h3 {
  margin: 2em 0 0.6em;
  font-family: var(--font-display);
  font-size: 1.42rem;
  font-weight: 600;
  line-height: 1.25;
  scroll-margin-top: 90px;
}
.lesson h3::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  border-radius: 99px;
  background: var(--amber);
  opacity: 0.75;
  margin-bottom: 12px;
}
.lesson h4 { margin: 1.4em 0 0.5em; font-size: 1.05rem; font-weight: 650; }
.lesson ul, .lesson ol { margin: 0 0 1.1em; padding-left: 1.35em; max-width: 66ch; }
.lesson li { margin-bottom: 0.4em; }
.lesson strong { color: #fff; font-weight: 640; }
.lesson a { color: var(--sky); text-decoration: underline; text-decoration-color: rgba(143, 193, 227, 0.4); text-underline-offset: 3px; }
.lesson a:hover { text-decoration-color: var(--sky); }
.lesson code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  padding: 0.08em 0.4em;
  border-radius: 6px;
}

.lesson table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.3em;
  font-size: 0.92rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.lesson th, .lesson td { text-align: left; padding: 9px 13px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.lesson th { background: var(--panel-2); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
.lesson tr:last-child td { border-bottom: none; }
.lesson tbody tr:hover { background: rgba(255, 255, 255, 0.02); }

.term {
  white-space: nowrap;
  color: var(--text);
}
.term em { color: var(--faint); font-style: normal; font-size: 0.88em; }

/* ---------- callouts ---------- */
.callout {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--faint);
  background: var(--panel);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  margin: 0 0 1.25em;
  max-width: 70ch;
  font-size: 0.94rem;
}
.callout strong { display: block; margin-bottom: 2px; }
.callout.tip { border-left-color: var(--good); background: var(--good-soft); }
.callout.tip strong { color: var(--good); }
.callout.key { border-left-color: var(--sky); background: var(--key-soft); }
.callout.key strong { color: var(--sky); }
.callout.warn { border-left-color: var(--bad); background: var(--bad-soft); }
.callout.warn strong { color: var(--bad); }

/* ---------- steps ---------- */
.steps { margin: 0 0 1.3em; display: flex; flex-direction: column; gap: 8px; max-width: 70ch; }
.step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
}
.step .n {
  flex: 0 0 auto;
  width: 26px; height: 26px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: var(--amber-soft);
  border: 1px solid var(--amber-line);
  color: var(--amber);
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 1px;
}
.step div { font-size: 0.94rem; }

/* ---------- demo panels ---------- */
.demo {
  margin: 0 0 1.5em;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  overflow: hidden;
}
.demo-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.015);
}
.demo-head .demo-icon {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--amber-soft);
  color: var(--amber);
  flex: 0 0 auto;
}
.demo-head .demo-icon svg { width: 15px; height: 15px; }
.demo-head .demo-title { flex: 1; font-weight: 640; font-size: 0.92rem; }
.demo-head .demo-tag {
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  border: 1px solid var(--line-soft);
  padding: 3px 8px;
  border-radius: 99px;
}
.demo-body { padding: 16px; }
.demo-body > .demo-desc { margin: 0 0 14px; font-size: 0.92rem; color: var(--muted); }

.demo-live {
  display: none;
  align-items: center;
  gap: 7px;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--good);
}
.demo-live::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 99px;
  background: var(--good);
  animation: pulse 1.2s ease-in-out infinite;
}
.demo.is-live .demo-live { display: inline-flex; }
@keyframes pulse { 50% { opacity: 0.35; } }

/* ---------- control widgets ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.1s, background 0.15s, border-color 0.15s, box-shadow 0.15s;
  user-select: none;
}
.btn:hover { border-color: var(--faint); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, #f0b052, var(--amber));
  border-color: rgba(232, 163, 61, 0.7);
  color: #1c1305;
  box-shadow: 0 4px 18px rgba(232, 163, 61, 0.25);
}
.btn.primary:hover { filter: brightness(1.06); }
.btn.playing { background: linear-gradient(180deg, #f0b052, var(--amber)); border-color: rgba(232,163,61,.7); color: #1c1305; }
.btn.small { padding: 6px 12px; font-size: 0.8rem; border-radius: 8px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; margin-bottom: 14px; }

.ctrl { display: flex; flex-direction: column; gap: 6px; min-width: 150px; flex: 1; }
.ctrl label {
  display: flex;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}
.ctrl label output { color: var(--amber); font-weight: 650; font-variant-numeric: tabular-nums; }
.ctrl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px 18px; margin-bottom: 14px; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 26px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--amber) var(--fill, 50%), var(--panel-2) var(--fill, 50%));
  border: 1px solid var(--line-soft);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  margin-top: -7px;
  border-radius: 99px;
  background: #fff;
  border: 3px solid var(--amber);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}
input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 99px;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
}
input[type="range"]::-moz-range-progress { height: 6px; border-radius: 99px; background: var(--amber); }
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 99px;
  background: #fff;
  border: 3px solid var(--amber);
}

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button {
  font: inherit;
  font-size: 0.82rem;
  padding: 7px 13px;
  background: transparent;
  color: var(--muted);
  border: none;
  cursor: pointer;
  border-right: 1px solid var(--line-soft);
  transition: background 0.15s, color 0.15s;
}
.seg button:last-child { border-right: none; }
.seg button:hover { color: var(--text); }
.seg button.on { background: var(--amber-soft); color: var(--amber); font-weight: 650; }

.toggle-row { display: flex; align-items: center; gap: 9px; font-size: 0.88rem; color: var(--muted); }
.toggle {
  position: relative;
  width: 40px; height: 22px;
  flex: 0 0 auto;
  border-radius: 99px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  padding: 0;
}
.toggle::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 99px;
  background: var(--faint);
  transition: transform 0.2s, background 0.2s;
}
.toggle.on { background: var(--amber-soft); border-color: var(--amber-line); }
.toggle.on::after { transform: translateX(18px); background: var(--amber); }

/* visualizer canvas */
.viz {
  width: 100%;
  height: 190px;
  border-radius: var(--radius-sm);
  background: #0a0e1a;
  border: 1px solid var(--line-soft);
  display: block;
}
.viz.tall { height: 230px; }
.viz-caption { display: flex; justify-content: space-between; font-size: 0.74rem; color: var(--faint); margin-top: 6px; }

/* ---------- video ---------- */
.video { margin: 0 0 1.5em; }
.video-frame {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: #000;
  aspect-ratio: 16 / 9;
}
.video-frame video { width: 100%; height: 100%; display: block; object-fit: contain; background: #000; }
.video-caption { display: flex; gap: 10px; align-items: baseline; padding: 10px 14px; background: var(--panel); border: 1px solid var(--line-soft); border-top: none; border-radius: 0 0 var(--radius) var(--radius); font-size: 0.85rem; color: var(--muted); }
.video-caption .credit { margin-left: auto; color: var(--faint); font-size: 0.75rem; white-space: nowrap; }
.video-missing {
  aspect-ratio: 16/9;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 20px;
  color: var(--faint);
  font-size: 0.9rem;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,0.015) 0 12px, transparent 12px 24px),
    var(--panel);
}

/* ---------- quiz ---------- */
.quiz {
  margin: 1.6em 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}
.quiz-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--sky-soft);
}
.quiz-head .q-title { font-weight: 650; font-size: 0.92rem; }
.quiz-head .q-count { margin-left: auto; font-size: 0.76rem; color: var(--sky); }
.quiz-body { padding: 16px; }
.quiz-q { margin-bottom: 18px; }
.quiz-q .q-text { font-weight: 600; margin-bottom: 9px; font-size: 0.95rem; }
.quiz-opts { display: flex; flex-direction: column; gap: 7px; }
.quiz-opt {
  display: flex;
  gap: 10px;
  align-items: center;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 0.9rem;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: var(--bg-2);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--faint); }
.quiz-opt .letter {
  width: 24px; height: 24px;
  flex: 0 0 auto;
  display: grid; place-items: center;
  border-radius: 7px;
  background: var(--panel-2);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--muted);
}
.quiz-opt.correct { border-color: var(--good); background: var(--good-soft); }
.quiz-opt.correct .letter { background: var(--good); color: #0c1a10; }
.quiz-opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.quiz-opt.wrong .letter { background: var(--bad); color: #1d0c08; }
.quiz-opt:disabled { cursor: default; }
.quiz-explain {
  display: none;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--muted);
  border-left: 3px solid var(--sky);
  padding: 8px 12px;
  background: var(--sky-soft);
  border-radius: 0 8px 8px 0;
}
.quiz-explain.show { display: block; }
.quiz-result {
  display: none;
  margin-top: 6px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
}
.quiz-result.show { display: flex; align-items: center; gap: 10px; }
.quiz-result.pass { background: var(--good-soft); color: var(--good); }
.quiz-result.retry { background: var(--bad-soft); color: var(--bad); }
.quiz-result .again { margin-left: auto; }

/* ---------- recap ---------- */
.recap {
  margin: 2em 0 1em;
  border: 1px solid var(--amber-line);
  background: linear-gradient(180deg, var(--amber-soft), transparent);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.recap h4 { margin: 0 0 10px; color: var(--amber); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; }
.recap ul { margin: 0; padding-left: 1.2em; max-width: none; }
.recap li { margin-bottom: 6px; font-size: 0.94rem; }
.recap li::marker { color: var(--amber); }

/* ---------- lesson footer ---------- */
.lesson-foot {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.complete-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 650;
  padding: 11px 20px;
  border-radius: 11px;
  border: 1px solid var(--amber-line);
  background: var(--amber-soft);
  color: var(--amber);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.complete-btn:hover { background: rgba(232, 163, 61, 0.22); }
.complete-btn:active { transform: translateY(1px); }
.complete-btn.done {
  background: var(--good-soft);
  border-color: rgba(127, 201, 139, 0.5);
  color: var(--good);
  cursor: default;
}
.lesson-foot .next-link {
  margin-left: auto;
  font: inherit;
  font-size: 0.9rem;
  color: var(--sky);
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 4px;
}
.lesson-foot .next-link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- loading / toast ---------- */
.loading { display: grid; place-items: center; gap: 14px; padding: 90px 0; color: var(--faint); }
.loading-ring {
  width: 34px; height: 34px;
  border-radius: 99px;
  border: 3px solid var(--line);
  border-top-color: var(--amber);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast-region { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 60; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast {
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 0.86rem;
  padding: 10px 18px;
  border-radius: 99px;
  box-shadow: var(--shadow);
  animation: toast-in 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  max-width: min(90vw, 480px);
  text-align: center;
}
.toast.good { border-color: rgba(127, 201, 139, 0.5); }
.toast.leaving { animation: toast-out 0.3s forwards; }
@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(8px); } }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  #sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 50;
    transform: translateX(-102%);
    transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: var(--shadow);
    width: min(85vw, 320px);
    flex-basis: auto;
  }
  #sidebar.open { transform: none; }
  .nav-toggle {
    display: grid;
    place-items: center;
    width: 38px; height: 38px;
    border-radius: 10px;
    border: 1px solid var(--line-soft);
    background: var(--panel);
    color: var(--text);
    cursor: pointer;
  }
  #main { padding: 26px 18px 70px; }
  .scrim {
    position: fixed;
    inset: 0;
    background: rgba(5, 8, 16, 0.6);
    z-index: 40;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
  }
  .scrim.show { opacity: 1; pointer-events: auto; }
}
@media (min-width: 961px) { .scrim { display: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
  html { scroll-behavior: auto; }
}