/* ---------- design tokens ---------- */
:root {
  --bg: #faf7f2;
  --surface: #ffffff;
  --surface-2: #f6f1ea;
  --border: #e8e0d5;
  --border-strong: #d4c8b8;
  --text: #1c1917;
  --muted: #78716c;
  --accent: #c2410c;
  --accent-hover: #9a3412;
  --accent-soft: #ffedd5;
  --on-accent: #ffffff;
  --gold: #a16207;
  --gold-soft: #fef3c7;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --info: #1d4ed8;
  --info-soft: #dbeafe;
  --appbar: #431407;
  --appbar-text: #fff7ed;
  --bubble-partner: #ffffff;
  --bubble-learner: #ffedd5;
  --shadow: 0 1px 2px rgba(28, 25, 23, .06), 0 4px 16px rgba(28, 25, 23, .06);
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12100e; --surface: #1c1917; --surface-2: #171412; --border: #2e2a27; --border-strong: #44403c;
    --text: #f5f5f4; --muted: #a8a29e; --accent: #fb923c; --accent-hover: #fdba74; --accent-soft: #431407;
    --on-accent: #1c0a03; --gold: #facc15; --gold-soft: #422006; --ok: #4ade80; --ok-soft: #14532d;
    --warn: #fbbf24; --warn-soft: #451a03; --danger: #f87171; --danger-soft: #450a0a; --info: #93c5fd;
    --info-soft: #172554; --appbar: #1c0a03; --bubble-partner: #1c1917; --bubble-learner: #3b1506;
    --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12100e; --surface: #1c1917; --surface-2: #171412; --border: #2e2a27; --border-strong: #44403c;
  --text: #f5f5f4; --muted: #a8a29e; --accent: #fb923c; --accent-hover: #fdba74; --accent-soft: #431407;
  --on-accent: #1c0a03; --gold: #facc15; --gold-soft: #422006; --ok: #4ade80; --ok-soft: #14532d;
  --warn: #fbbf24; --warn-soft: #451a03; --danger: #f87171; --danger-soft: #450a0a; --info: #93c5fd;
  --info-soft: #172554; --appbar: #1c0a03; --bubble-partner: #1c1917; --bubble-learner: #3b1506;
  --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .75rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.es { font-weight: 600; }
[hidden] { display: none !important; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  min-height: 40px; padding: .5rem 1rem; border-radius: 999px;
  border: 1px solid var(--border-strong); background: var(--surface-2); color: var(--text);
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn-danger { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.btn-small { min-height: 32px; padding: .25rem .75rem; font-size: .85rem; }
.btn-big { min-height: 52px; padding: .75rem 1.5rem; font-size: 1.05rem; }

/* One shared hit target for every icon / close / utility button: a solid,
   visible background and border at rest, not just the glyph. */
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; padding: 0; flex: none;
  border-radius: 999px; border: 1px solid var(--border-strong);
  background: var(--surface-2); color: var(--text);
  font: inherit; font-size: 1rem; line-height: 1; cursor: pointer;
}
.icon-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.icon-btn.active { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.icon-btn-sm { width: 30px; height: 30px; font-size: .85rem; }
.appbar .icon-btn { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.14); color: var(--appbar-text); }
.appbar .icon-btn:hover { background: rgba(255,255,255,.16); }

/* ---------- app shell ---------- */
.appbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1rem;
  padding: .5rem 1rem; background: var(--appbar); color: var(--appbar-text);
}
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; font-size: 1.1rem; color: inherit; text-decoration: none; }
.brand img { width: 30px; height: 30px; }
.nav { display: flex; gap: .25rem; margin-left: .5rem; }
.nav a {
  display: inline-flex; align-items: center; gap: .35rem;
  padding: .45rem .8rem; border-radius: 999px; color: var(--appbar-text); text-decoration: none;
  font-weight: 600; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.10);
}
.nav a:hover { background: rgba(255,255,255,.14); }
.nav a.active { background: var(--appbar-text); color: var(--appbar); }
.nav .badge { background: var(--accent); color: #fff; border-radius: 999px; padding: 0 .45rem; font-size: .75rem; }
.appbar .spacer { flex: 1; }
.streak-pill { display: inline-flex; align-items: center; gap: .3rem; font-weight: 700; padding: .25rem .65rem;
  border-radius: 999px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); }
.user-menu { position: relative; }
.user-menu img, .avatar {
  width: 36px; height: 36px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent); color: var(--on-accent); font-weight: 700; object-fit: cover;
}
.menu {
  position: absolute; right: 0; top: calc(100% + 6px); min-width: 220px; z-index: 30;
  background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: .4rem;
}
.menu a, .menu button {
  display: block; width: 100%; text-align: left; padding: .5rem .75rem; border-radius: 8px; font: inherit;
  color: var(--text); text-decoration: none; background: var(--surface-2); border: 1px solid var(--border);
  margin-bottom: .3rem; cursor: pointer;
}
.menu a:hover, .menu button:hover { background: var(--accent-soft); border-color: var(--accent); }
.menu .menu-head { padding: .4rem .75rem .6rem; font-size: .85rem; color: var(--muted); }

main.page { max-width: 980px; margin: 0 auto; padding: 1.25rem 16px 6rem; }
.banner { padding: .75rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; border: 1px solid; }
.banner.warn { background: var(--warn-soft); border-color: var(--warn); }
.banner.error { background: var(--danger-soft); border-color: var(--danger); }
.banner.info { background: var(--info-soft); border-color: var(--info); }

/* ---------- cards & layout ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1.1rem 1.25rem; margin-bottom: 1rem;
}
.card.hero { background: linear-gradient(135deg, var(--accent-soft), var(--surface) 70%); }
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.row { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.stack > * + * { margin-top: .75rem; }
.stat { font-size: 1.8rem; font-weight: 800; line-height: 1.1; }
.stat-label { color: var(--muted); font-size: .85rem; }
.pill { display: inline-flex; align-items: center; gap: .25rem; padding: .1rem .55rem; border-radius: 999px;
  font-size: .78rem; font-weight: 700; background: var(--surface-2); border: 1px solid var(--border); }
.pill.cefr { background: var(--gold-soft); border-color: var(--gold); color: var(--gold); }
.pill.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.pill.accent { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.progress-bar { height: 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.progress-bar > span { display: block; height: 100%; background: var(--accent); border-radius: 999px; transition: width .3s; }
.week { display: flex; gap: .4rem; align-items: flex-end; height: 70px; }
.week .day { flex: 1; display: flex; flex-direction: column; align-items: center; gap: .2rem; font-size: .72rem; color: var(--muted); }
.week .bar { width: 100%; max-width: 28px; border-radius: 6px 6px 2px 2px; background: var(--accent); min-height: 3px; }
.week .bar.zero { background: var(--border); }
.heatmap { display: grid; grid-template-rows: repeat(7, 14px); grid-auto-flow: column; grid-auto-columns: 14px; gap: 3px; }
.heatmap span { border-radius: 3px; background: var(--surface-2); border: 1px solid var(--border); }
.heatmap span.l1 { background: #fed7aa; border-color: #fed7aa; }
.heatmap span.l2 { background: #fb923c; border-color: #fb923c; }
.heatmap span.l3 { background: #c2410c; border-color: #c2410c; }

/* ---------- course ---------- */
.unit-list { display: grid; gap: .75rem; }
.unit {
  display: grid; grid-template-columns: 44px 1fr auto; gap: .9rem; align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem 1rem;
}
.unit.next { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.unit-num { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 800; background: var(--surface-2); border: 2px solid var(--border-strong); }
.unit.done .unit-num { background: var(--ok); border-color: var(--ok); color: #fff; }
.unit.in_progress .unit-num { border-color: var(--accent); color: var(--accent); }
.unit-steps { display: flex; gap: .4rem; flex-wrap: wrap; }
.check { color: var(--ok); font-weight: 800; }

/* ---------- lesson ---------- */
.lesson-step { max-width: 720px; margin: 0 auto; }
.dialogue { display: grid; gap: .5rem; }
.line { display: grid; grid-template-columns: auto 1fr auto; gap: .6rem; align-items: start;
  padding: .55rem .7rem; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--border); }
.line .speaker { font-weight: 700; color: var(--accent); min-width: 4.5rem; }
.line .en { color: var(--muted); font-size: .9rem; }
.line.ex .speaker { min-width: 0; }
.chunk { display: grid; grid-template-columns: 1fr auto; gap: .25rem .75rem; padding: .7rem .8rem;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface); }
.chunk .es { font-size: 1.05rem; }
.chunk .example { grid-column: 1 / -1; font-size: .88rem; color: var(--muted); }
.reveal-en { filter: blur(4px); cursor: pointer; transition: filter .2s; }
.reveal-en.shown { filter: none; }
.exercise { text-align: center; padding: 1.5rem 1rem; }
.exercise .prompt { font-size: 1.35rem; font-weight: 600; margin: .75rem 0 1.1rem; }
.choices { display: grid; gap: .6rem; max-width: 460px; margin: 0 auto; }
.choice { justify-content: flex-start; text-align: left; border-radius: 12px; min-height: 48px; }
.choice.correct { background: var(--ok-soft); border-color: var(--ok); }
.choice.wrong { background: var(--danger-soft); border-color: var(--danger); }
.answer-row { display: flex; gap: .5rem; max-width: 520px; margin: 0 auto; }
.answer-row input { flex: 1; }
.result { margin: 1rem auto 0; max-width: 520px; padding: .75rem 1rem; border-radius: 10px; text-align: left; border: 1px solid; }
.result.ok { background: var(--ok-soft); border-color: var(--ok); }
.result.close { background: var(--warn-soft); border-color: var(--warn); }
.result.bad { background: var(--danger-soft); border-color: var(--danger); }
.word-ok { color: var(--ok); font-weight: 700; }
.word-miss { color: var(--danger); font-weight: 700; text-decoration: underline dotted; }
.accent-keys { display: flex; gap: .3rem; justify-content: center; margin-top: .5rem; flex-wrap: wrap; }
.accent-keys .icon-btn { width: 34px; height: 34px; font-weight: 700; }

/* ---------- forms ---------- */
input[type=text], input[type=email], input[type=number], select, textarea {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: 10px; padding: .55rem .75rem; min-height: 42px; width: 100%;
}
input:focus, select:focus, textarea:focus, .btn:focus-visible, .icon-btn:focus-visible, .nav a:focus-visible {
  outline: 3px solid var(--accent-soft); outline-offset: 1px; border-color: var(--accent);
}
label.field { display: block; margin-bottom: .9rem; }
label.field > span { display: block; font-weight: 600; margin-bottom: .3rem; }
.options { display: grid; gap: .5rem; }
.option {
  display: flex; gap: .75rem; align-items: flex-start; padding: .75rem .9rem; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--border-strong); background: var(--surface-2);
}
.option:hover { border-color: var(--accent); }
.option.selected { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 2px var(--accent-soft); }
.option input { margin-top: .3rem; }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.chip { padding: .35rem .8rem; border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface-2);
  font: inherit; cursor: pointer; color: var(--text); }
.chip.selected { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* ---------- review ---------- */
.flashcard { text-align: center; padding: 2rem 1rem; }
.flashcard .front { font-size: 1.4rem; font-weight: 600; margin: .5rem 0 1.25rem; }
.flashcard .back { font-size: 1.5rem; font-weight: 700; color: var(--accent); margin: 1rem 0 .25rem; }
.ratings { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; max-width: 560px; margin: 1.25rem auto 0; }
.ratings .btn { flex-direction: column; gap: 0; border-radius: 12px; min-height: 58px; }
.ratings .btn small { font-weight: 400; color: var(--muted); }
.ratings .btn.suggested { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
table.cards { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.cards th, table.cards td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--border); vertical-align: top; }

/* ---------- talk ---------- */
.scenario { display: flex; flex-direction: column; gap: .4rem; }
.scenario .who { display: flex; gap: .65rem; align-items: center; }
.persona-avatar { width: 44px; height: 44px; border-radius: 50%; flex: none; display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; background: var(--accent); font-size: 1.05rem; }
.goal-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .3rem; font-size: .9rem; }
.goal-list li { display: flex; gap: .4rem; align-items: center; }
.goal-list li .box { width: 18px; height: 18px; border-radius: 5px; border: 2px solid var(--border-strong); flex: none;
  display: inline-flex; align-items: center; justify-content: center; font-size: .7rem; }
.goal-list li.done .box { background: var(--ok); border-color: var(--ok); color: #fff; }
.goal-list li.done { color: var(--muted); text-decoration: line-through; }

.convo { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 1rem; align-items: start; }
.convo-side { position: sticky; top: 76px; }
.transcript { display: flex; flex-direction: column; gap: .75rem; min-height: 45vh; padding-bottom: 1rem; }
.msg { max-width: 85%; display: flex; flex-direction: column; gap: .3rem; }
.msg.partner { align-self: flex-start; }
.msg.learner { align-self: flex-end; align-items: flex-end; }
.bubble { padding: .65rem .9rem; border-radius: 16px; border: 1px solid var(--border); background: var(--bubble-partner); box-shadow: var(--shadow); }
.msg.partner .bubble { border-top-left-radius: 4px; }
.msg.learner .bubble { background: var(--bubble-learner); border-color: var(--accent-soft); border-top-right-radius: 4px; }
.bubble .tr { margin-top: .35rem; padding-top: .35rem; border-top: 1px dashed var(--border-strong); color: var(--muted); font-size: .9rem; }
.msg-tools { display: flex; gap: .3rem; }
.feedback { font-size: .88rem; border-radius: 12px; padding: .5rem .75rem; border: 1px solid; max-width: 100%; text-align: left; }
.feedback.great { background: var(--ok-soft); border-color: var(--ok); }
.feedback.good { background: var(--info-soft); border-color: var(--info); }
.feedback.needs_work { background: var(--warn-soft); border-color: var(--warn); }
.feedback.pending { background: var(--surface-2); border-color: var(--border); color: var(--muted); }
.feedback .fix { font-weight: 700; }
.typing { display: inline-flex; gap: 4px; }
.typing span { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: .2s; }
.typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

.talkbar {
  position: sticky; bottom: 0; z-index: 10; margin: 0 -16px; padding: .75rem 16px;
  background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(6px); border-top: 1px solid var(--border);
}
.talkbar .interim { min-height: 1.5rem; text-align: center; color: var(--muted); font-style: italic; margin-bottom: .4rem; }
.talkbar .controls { display: flex; align-items: center; gap: .6rem; justify-content: center; }
.mic {
  width: 72px; height: 72px; border-radius: 50%; border: 3px solid var(--accent); background: var(--accent); color: var(--on-accent);
  font-size: 1.8rem; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; flex: none;
  box-shadow: 0 4px 14px rgba(194, 65, 12, .35);
}
.mic:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.mic.listening { animation: pulse 1.2s infinite; background: var(--danger); border-color: var(--danger); }
.mic.speaking { background: var(--surface-2); color: var(--accent); }
.mic:disabled { opacity: .5; cursor: not-allowed; animation: none; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(220, 38, 38, .5); } 70% { box-shadow: 0 0 0 18px rgba(220, 38, 38, 0); } 100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0); } }
.typebox { display: flex; gap: .5rem; margin-top: .6rem; }
.switch { display: inline-flex; align-items: center; gap: .4rem; font-size: .85rem; cursor: pointer; user-select: none; }
.hint-box { border: 1px dashed var(--accent); background: var(--accent-soft); border-radius: 12px; padding: .65rem .85rem; }
.hint-box .sugg { display: flex; align-items: center; gap: .5rem; padding: .25rem 0; }

/* ---------- admin ---------- */
.table-wrap { overflow-x: auto; }
table.data { border-collapse: collapse; width: 100%; font-size: .82rem; }
table.data th, table.data td { padding: .35rem .5rem; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
table.data tr.clickable { cursor: pointer; }
table.data tr.clickable:hover { background: var(--accent-soft); }
pre.raw { white-space: pre-wrap; word-break: break-word; background: var(--surface-2); padding: .75rem; border-radius: 8px;
  border: 1px solid var(--border); max-height: 360px; overflow: auto; font-size: .8rem; }
.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1rem; }
.tabs .btn.active { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* ---------- modal & toast ---------- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 50; display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); max-width: 560px; width: 100%;
  max-height: 90vh; overflow: auto; padding: 1.25rem; border: 1px solid var(--border); }
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .75rem; }
.toast { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%); z-index: 60; background: var(--text); color: var(--bg);
  padding: .6rem 1rem; border-radius: 999px; box-shadow: var(--shadow); font-weight: 600; max-width: calc(100% - 32px); }
.spinner { width: 28px; height: 28px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; margin: 0 auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading { text-align: center; padding: 3rem 1rem; color: var(--muted); }
.loading .spinner { margin-bottom: 1rem; }

/* ---------- login ---------- */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px;
  background: radial-gradient(circle at 20% 10%, var(--accent-soft), var(--bg) 55%); }
.login-card { max-width: 440px; width: 100%; text-align: center; background: var(--surface); border: 1px solid var(--border);
  border-radius: 18px; box-shadow: var(--shadow); padding: 2rem 1.5rem; }
.login-logo { margin-bottom: .5rem; }
.login-tagline { color: var(--muted); margin-bottom: 1.25rem; }
.login-points { text-align: left; display: grid; gap: .4rem; margin: 0 0 1.25rem; padding: 0; list-style: none; font-size: .92rem; }
.login-points li::before { content: "✓ "; color: var(--ok); font-weight: 800; }
.g-signin { display: flex; justify-content: center; min-height: 44px; }
.login-error { background: var(--danger-soft); border: 1px solid var(--danger); color: var(--danger); padding: .6rem; border-radius: 10px; margin-bottom: 1rem; }
.dev-login { margin-top: 1.25rem; text-align: left; border: 1px dashed var(--border-strong); border-radius: 10px; padding: .6rem .8rem; }
.dev-login summary { cursor: pointer; font-weight: 600; color: var(--muted); }
.dev-login form { display: flex; gap: .5rem; margin-top: .6rem; }
.login-note { margin-top: 1.25rem; font-size: .78rem; color: var(--muted); }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 25; margin: 0; justify-content: space-around;
    background: var(--appbar); padding: .4rem .25rem calc(.4rem + env(safe-area-inset-bottom));
  }
  .nav a { flex-direction: column; gap: 0; padding: .3rem .5rem; font-size: .72rem; }
  .nav a .nav-icon { font-size: 1.15rem; }
  .convo { grid-template-columns: 1fr; }
  .convo-side { position: static; order: -1; }
  .talkbar { bottom: 58px; }
  .unit { grid-template-columns: 40px 1fr; }
  .unit > :last-child { grid-column: 1 / -1; }
  .ratings { grid-template-columns: repeat(2, 1fr); }
  .msg { max-width: 95%; }
  main.page { padding-bottom: 8rem; }
}