/* RoboLab — инженерная лаборатория. Mobile-first, BEM, CSS-переменные. */
:root {
  --bg: #eef1f4;
  --bg-elev: #f7f8fa;
  --ink: #1a1f28;
  --muted: #5c6573;
  --line: #c9d1dc;
  --accent: #e25a2a;
  --accent-ink: #fff8f4;
  --ok: #2f6f4f;
  --warn: #8a6a12;
  --err: #a33b32;
  --signal: #1e3a5f;
  --grid: rgba(30, 58, 95, 0.07);
  --radius: 8px;
  --font: "IBM Plex Sans", "Segoe UI", "Noto Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "ui-monospace", "SFMono-Regular", Menlo, monospace;
  --shadow: 0 1px 0 rgba(26, 31, 40, 0.04);
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --tabbar: 64px;
  --sidebar: 232px;
}

html[data-theme="dark"] {
  --bg: #12151c;
  --bg-elev: #1a1f28;
  --ink: #e8edf4;
  --muted: #9aa4b2;
  --line: #2c3440;
  --accent: #ff6a3d;
  --accent-ink: #1a120e;
  --ok: #7cb342;
  --warn: #d4a017;
  --err: #d46a62;
  --signal: #8eb4d9;
  --grid: rgba(142, 180, 217, 0.06);
  --shadow: none;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="system"] {
    --bg: #12151c;
    --bg-elev: #1a1f28;
    --ink: #e8edf4;
    --muted: #9aa4b2;
    --line: #2c3440;
    --accent: #ff6a3d;
    --accent-ink: #1a120e;
    --ok: #7cb342;
    --warn: #d4a017;
    --err: #d46a62;
    --signal: #8eb4d9;
    --grid: rgba(142, 180, 217, 0.06);
    --shadow: none;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
html { color-scheme: light dark; overflow-x: hidden; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    var(--bg);
  background-size: 24px 24px, 24px 24px, auto;
  min-height: 100dvh;
  overflow-x: hidden;
}
[hidden] { display: none !important; }
a { color: var(--signal); text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4 { font-weight: 650; letter-spacing: -0.02em; line-height: 1.2; margin: 0 0 0.6rem; }
p { margin: 0 0 0.8rem; }
ul, ol { margin: 0 0 1rem; padding-left: 1.2rem; }
code, pre { font-family: var(--mono); font-size: 0.9em; }
.muted { color: var(--muted); }
.kicker { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 0.35rem; }
.lead { font-size: 1.05rem; max-width: 62ch; }
.prose { max-width: 70ch; white-space: pre-wrap; }

.app__grid { min-height: 100dvh; }
.sidebar { display: none; }
.app__main { padding-bottom: calc(var(--tabbar) + env(safe-area-inset-bottom)); min-width: 0; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  padding: 1rem 1rem 0.5rem;
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  z-index: 5;
}
.topbar__title { font-size: 1.45rem; margin: 0; }
.topbar__kicker { margin: 0; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); letter-spacing: 0.12em; text-transform: uppercase; }
.topbar__actions { display: flex; gap: 0.4rem; }
.page { padding: 0.5rem 1rem 2rem; max-width: 1100px; min-width: 0; }
.app--onboarding .page { max-width: none; padding: 0; }

.tabbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  background: var(--bg-elev);
  border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 20;
}
.tabbar__item {
  text-align: center;
  padding: 0.7rem 0.2rem;
  font-size: 0.72rem;
  color: var(--muted);
  text-decoration: none;
}
.tabbar__item.is-active { color: var(--accent); font-weight: 650; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.65rem 1rem;
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.15s var(--ease);
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn--primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn--ghost { background: transparent; }
.btn--danger { background: var(--err); color: #fff; border-color: transparent; }
.btn--block { width: 100%; }
.btn--small { padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.icon-btn {
  min-width: 40px; min-height: 40px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: var(--radius);
  position: relative;
}
.icon-btn__dot {
  position: absolute; top: 6px; right: 6px;
  width: 8px; height: 8px; border-radius: 50%;
  background: transparent;
}
.icon-btn__dot.is-on { background: var(--accent); }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}
.card--link { display: block; color: inherit; text-decoration: none; }
.card--signal { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}
.badge {
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 99px;
  font-size: 0.7rem;
  padding: 0.05rem 0.4rem;
}
.meter { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 0.4rem 0; }
.meter > span { display: block; height: 100%; background: var(--accent); }
.banner {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 0.8rem 1rem;
  border-radius: var(--radius);
  margin: 0.8rem 0;
}
.alert { padding: 0.8rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.alert--ok { background: color-mix(in srgb, var(--ok) 15%, var(--bg-elev)); }
.alert--err { background: color-mix(in srgb, var(--err) 15%, var(--bg-elev)); }
.choice-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.6rem 0 1rem; }
.choice, .choice-row > .choice {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.55rem 0.85rem;
  background: var(--bg-elev);
  cursor: pointer;
  position: relative;
}
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice.is-active, .choice:has(input:checked) { border-color: var(--accent); color: var(--accent); }
.choice--wide { display: flex; width: 100%; align-items: flex-start; gap: 0.6rem; }
.choice--wide input { position: static; opacity: 1; pointer-events: auto; }
.check { display: flex; gap: 0.5rem; align-items: flex-start; margin: 0.4rem 0; }
.form .field { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 0.8rem; }
.form .field span { font-size: 0.9rem; color: var(--muted); }
.form input, .form select, .form textarea {
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 6px;
  padding: 0.6rem 0.7rem;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}
.form textarea { min-height: 5rem; resize: vertical; }
.form-grid { display: grid; gap: 0.7rem; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
.stack { display: grid; gap: 0.45rem; }
.split { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
.mission__actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.8rem; }
.task-list { list-style: none; padding: 0; }
.task-list li { display: flex; justify-content: space-between; gap: 1rem; padding: 0.55rem 0; border-bottom: 1px solid var(--line); }
.task-list a { color: inherit; text-decoration: none; display: flex; flex-direction: column; }
.today__hero, .roadmap > .split { display: grid; gap: 1rem; min-width: 0; }
.robot, .robot__svg { max-width: 100%; }
.rank-title { font-size: 1.6rem; }
.robot { margin: 0; }
.robot__svg { width: 100%; max-width: 360px; height: auto; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); }
.robot__grid { fill: none; stroke: var(--line); }
.robot__part { fill: none; stroke: var(--muted); stroke-width: 1.4; }
.robot__part text { fill: var(--muted); font-size: 9px; font-family: var(--mono); stroke: none; }
.robot__part.is-on { stroke: var(--accent); }
.robot__part.is-on text { fill: var(--accent); }
.robot__wire { stroke: var(--line); }
.robot__legend { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.robot__chip { font-size: 0.72rem; border: 1px solid var(--line); padding: 0.15rem 0.4rem; border-radius: 4px; color: var(--muted); }
.robot__chip.is-on { color: var(--accent); border-color: var(--accent); }
.timer__clock { font-family: var(--mono); font-size: 2.6rem; letter-spacing: 0.04em; margin: 0.2rem 0; }
.modules { list-style: none; padding: 0; }
.module { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; margin-bottom: 0.8rem; background: var(--bg-elev); }
.module--locked { opacity: 0.7; }
.module--current { border-color: var(--accent); }
.lesson-list { list-style: none; padding: 0; }
.lesson-list a { display: flex; justify-content: space-between; gap: 1rem; padding: 0.4rem 0; color: inherit; text-decoration: none; border-bottom: 1px solid var(--line); }
.cards { display: grid; gap: 0.8rem; grid-template-columns: 1fr; }
.card, .module, .task { min-width: 0; overflow-wrap: anywhere; }
.lesson__layout { display: grid; gap: 1rem; min-width: 0; }
.photos { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.5rem; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.7rem; margin-bottom: 1rem; }
.stat-grid strong { font-size: 1.3rem; }
.bars { list-style: none; padding: 0; }
.bars li { display: flex; justify-content: space-between; padding: 0.35rem 0; border-bottom: 1px solid var(--line); }
.note-list { list-style: none; padding: 0; }
.note { border-bottom: 1px solid var(--line); }
.note a { display: block; padding: 0.8rem 0; color: inherit; text-decoration: none; }
.note.is-unread strong { color: var(--accent); }
.onboard { max-width: 640px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
.onboard__dots { display: flex; gap: 0.35rem; margin: 0.6rem 0 1.2rem; }
.onboard__dots span { width: 28px; height: 4px; background: var(--line); border-radius: 4px; }
.onboard__dots span.is-on { background: var(--accent); }
.onboard__pane[hidden] { display: none; }
.onboard__nav { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.auth { min-height: 100dvh; display: grid; }
.auth__shell { display: grid; min-height: 100dvh; }
.auth__panel { display: none; }
.auth__card { padding: 1.5rem 1.2rem; }
.auth__title { font-size: 1.5rem; }
.auth__hint, .auth__links { color: var(--muted); }
.auth__links { display: flex; gap: 1rem; margin-top: 1rem; }
.auth__signals { display: flex; gap: 0.5rem; flex-wrap: wrap; list-style: none; padding: 0; font-family: var(--mono); font-size: 0.8rem; }
.empty { padding: 3rem 1rem; text-align: left; }
.empty__code { font-family: var(--mono); font-size: 2rem; color: var(--accent); }
.empty__trace { overflow: auto; font-size: 0.75rem; }
.toast {
  position: fixed; bottom: calc(var(--tabbar) + 12px); left: 12px; right: 12px;
  background: var(--ink); color: var(--bg); padding: 0.8rem 1rem; border-radius: var(--radius); z-index: 40;
}
.task.is-focus { outline: 1px solid var(--accent); }
@media (min-width: 900px) {
  .sidebar {
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100dvh;
    width: var(--sidebar);
    max-width: var(--sidebar);
    flex-shrink: 0;
    border-right: 1px solid var(--line);
    padding: 1.2rem 1rem;
    background: var(--bg-elev);
    overflow: hidden;
  }
  .app__grid {
    display: grid;
    grid-template-columns: var(--sidebar) minmax(0, 1fr);
  }
  .app--onboarding .app__grid,
  .app--onboarding.app .app__grid {
    display: block;
    grid-template-columns: none;
  }
  .tabbar { display: none; }
  .app__main { padding-bottom: 2rem; min-width: 0; }
  .page { padding: 1rem 2rem 3rem; }
  .sidebar__brand { display: flex; align-items: center; gap: 0.6rem; color: inherit; text-decoration: none; font-weight: 700; }
  .sidebar__mark { width: 14px; height: 14px; background: var(--accent); flex-shrink: 0; }
  .sidebar__tag { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
  .sidebar__nav { display: grid; gap: 0.2rem; margin: 1.2rem 0 auto; }
  .sidebar__link { display: flex; justify-content: space-between; padding: 0.45rem 0.5rem; color: var(--ink); text-decoration: none; border-radius: 6px; }
  .sidebar__link.is-active { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); }
  .sidebar__user { font-size: 0.85rem; border-top: 1px solid var(--line); padding-top: 0.8rem; min-width: 0; }
  .sidebar__who { display: grid; margin-bottom: 0.5rem; min-width: 0; }
  .sidebar__who span { color: var(--muted); font-size: 0.8rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .today__hero, .roadmap > .split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(240px, 0.85fr);
    align-items: start;
  }
  .cards { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
  .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lesson__layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }
  .timer { position: sticky; top: 1rem; }
  .auth__shell { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
  .auth__panel {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2.5rem;
    background: #152033;
    color: #e8edf4;
  }
  .auth__brand { font-family: var(--mono); letter-spacing: 0.16em; text-transform: uppercase; }
  .auth__headline { font-size: 2rem; max-width: 16ch; }
  .auth__card { display: flex; flex-direction: column; justify-content: center; padding: 3rem 4rem; max-width: 520px; width: 100%; margin: 0 auto; }
  .onboard {
    max-width: 760px;
    margin: 3.5rem auto;
    padding: 2.4rem 2.6rem 2.8rem;
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 12px;
  }
  .toast { left: auto; right: 1.5rem; width: 320px; bottom: 1.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}