:root {
  --bg: #f3eee4;
  --paper: #fffdf8;
  --ink: #1b2a32;
  --muted: #5d6c74;
  --line: #e4d9c8;
  --teal: #0d6e6a;
  --teal-dark: #0a4f4c;
  --amber: #c97816;
  --ok: #2c8a5c;
  --bad: #c2413b;
  --shadow: 0 10px 30px rgba(27, 42, 50, 0.08);
  --radius: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
img, svg, video { max-width: 100%; height: auto; }
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding-bottom: 4px;
}
.md-body, .q-prompt, .opt { overflow-wrap: break-word; }
.md-body table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
body {
  font-family: Manrope, system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #e7f3f1 0%, transparent 50%),
    radial-gradient(900px 400px at 100% 0%, #f8e9d4 0%, transparent 46%),
    var(--bg);
  min-height: 100vh;
}
a { color: var(--teal-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { font-weight: 800; letter-spacing: -0.03em; margin: 0 0 .4em; }
h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.muted { color: var(--muted); }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto 64px; padding-bottom: env(safe-area-inset-bottom); }
.crumb { color: var(--muted); margin: 0 0 12px; line-height: 1.4; }
.crumb a { font-weight: 600; }
.page-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 0 0 16px;
}
.page-back { font-weight: 700; }
.crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 0;
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  min-width: 0;
}
.crumb-list li {
  display: flex;
  align-items: center;
  min-width: 0;
}
.crumb-list li:not(:last-child)::after {
  content: "·";
  margin: 0 8px;
  color: var(--muted);
}
.crumb-list a { font-weight: 700; }
.crumb-list span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 42ch;
}
.nav-step { display: flex; flex-wrap: wrap; gap: 8px; margin-left: auto; }
.page-nav-bottom {
  margin: 28px 0 8px;
  padding-top: 4px;
}
.topbar {
  display: flex; align-items: center; gap: 18px;
  width: min(1120px, calc(100% - 32px)); margin: 16px auto 28px;
  padding: 10px 14px; background: rgba(255,253,248,.86);
  border: 1px solid var(--line); border-radius: 999px; backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: center; gap: 10px; color: inherit; }
.brand small { display: block; color: var(--muted); font-size: 12px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 12px;
  background: conic-gradient(from 220deg, var(--teal), #7bc4b8, var(--amber), var(--teal));
  box-shadow: inset 0 0 0 3px #fff;
}
.brand-mark.lg { width: 52px; height: 52px; border-radius: 16px; }
.topnav { display: flex; gap: 14px; margin-left: 8px; }
.topnav a { color: var(--ink); font-weight: 600; }
.nav-count {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 1.35em; padding: 1px 6px; margin-left: 4px;
  border-radius: 99px; background: var(--bad); color: #fff;
  font-size: 11px; font-weight: 800; line-height: 1.4;
}
.report-box {
  margin: 16px 0 0;
  padding: 12px;
  border: 1px solid #f0c9c4;
  border-radius: 16px;
  background: #fdf6f4;
}
.report-box summary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--bad);
  background: var(--bad);
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  box-shadow: 0 8px 18px rgba(194, 65, 59, .18);
}
.report-box summary:hover { filter: brightness(1.06); }
.report-box summary::-webkit-details-marker { display: none; }
.report-box summary::before { content: "⚑"; font-size: 1.05em; }
.report-box.is-sent {
  border-color: #ead3a8;
  background: #fbf6ea;
}
.report-box.is-sent summary {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 8px 18px rgba(201, 120, 22, .18);
}
.report-box .report-form, .report-box label { margin-top: 10px; color: var(--ink); }
.report-box textarea { width: 100%; min-height: 72px; margin-top: 6px; }
.q-card .report-box, .result-list .report-box { flex: 1 1 100%; }
.theory-edit { width: 100%; min-height: 280px; font-family: ui-monospace, Consolas, monospace; font-size: 14px; line-height: 1.45; }
.who { margin-left: auto; display: flex; align-items: center; gap: 10px; min-width: 0; }
.who span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 999px; padding: 10px 16px; font-weight: 700;
  cursor: pointer; font-family: inherit; text-decoration: none;
  text-align: center; line-height: 1.25;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--teal); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); }
.btn-sm { padding: 6px 10px; font-size: 13px; }
.btn-block { width: 100%; }
.card, .paper, .hero-card, .stat, .auth-card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.card, .paper { padding: 22px; margin: 16px 0; }
.hero-card {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 28px; margin: 0 0 18px;
}
.hero-card.compact { padding: 18px 22px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: 12px; color: var(--teal); font-weight: 800; margin: 0 0 6px; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat { padding: 18px; }
.stat span, .stat small { color: var(--muted); }
.stat strong { display: block; font-size: 1.6rem; margin: 6px 0; }
.stat.mini { min-width: 140px; text-align: right; }
.bar { height: 8px; background: #efe6d8; border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--teal), #7bc4b8); }
.bar-lg { height: 10px; }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 12px; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.topic-tile, .lesson-tile {
  --tile: #0d6e6a;
  --tile-bg: #f3faf8;
  --tile-soft: #d7ebe6;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: inherit;
  text-decoration: none;
  border-radius: 18px;
  border: 1px solid var(--tile-soft);
  background: linear-gradient(180deg, var(--tile-bg) 0%, #fff 52%);
  box-shadow: 0 8px 20px rgba(27, 42, 50, 0.05);
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.topic-tile { min-height: 176px; padding: 16px 16px 14px; }
.lesson-tile { min-height: 138px; padding: 14px 14px 12px; }
.topic-tile::before, .lesson-tile::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: var(--tile);
}
.topic-tile:hover, .lesson-tile:hover {
  text-decoration: none;
  transform: translateY(-3px);
  border-color: var(--tile);
  box-shadow: 0 14px 28px rgba(27, 42, 50, 0.1);
}
.tile-kicker {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--tile);
}
.topic-tile b, .lesson-tile b {
  width: fit-content;
  min-width: 36px;
  padding: 5px 9px;
  border-radius: 11px;
  background: var(--tile);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.2;
}
.topic-tile .tile-title, .lesson-tile .tile-title {
  color: var(--ink);
  font-size: 15px;
  line-height: 1.35;
  font-weight: 800;
}
.lesson-tile .tile-title { font-size: 1.05rem; }
.topic-tile small, .topic-tile em, .lesson-tile em, .lesson-tile span {
  color: var(--muted);
  font-style: normal;
  font-size: 12px;
  line-height: 1.35;
}
.tile-stats { display: flex; justify-content: space-between; gap: 8px; margin-top: auto; }
.topic-tile .bar, .lesson-tile .bar {
  background: var(--tile-soft);
}
.topic-tile .bar i, .lesson-tile .bar i {
  background: var(--tile);
}
.topic-tile.done, .lesson-tile.done {
  background: linear-gradient(180deg, #e9f7ef 0%, #fff 55%);
  border-color: #bfe0cc;
}
.topic-tile.progress, .lesson-tile.progress {
  background: linear-gradient(180deg, var(--tile-bg) 0%, #fff 58%);
}
.lesson-tile.locked { opacity: .55; background: #f3eee6; }
.tone-1 { --tile: #0d6e6a; --tile-bg: #e7f4f2; --tile-soft: #cfe4e0; }
.tone-2 { --tile: #c97816; --tile-bg: #fbf3e4; --tile-soft: #f0ddc0; }
.tone-3 { --tile: #2a6f97; --tile-bg: #e8f2f8; --tile-soft: #c5dceb; }
.tone-4 { --tile: #6b4c7a; --tile-bg: #f4eef7; --tile-soft: #ddcfe4; }
.tone-5 { --tile: #3d6b4f; --tile-bg: #eaf4ee; --tile-soft: #c5ddd0; }
.tone-6 { --tile: #b85c4a; --tile-bg: #f8eeeb; --tile-soft: #e8cfc8; }
.test-tile .tile-score {
  margin-top: auto;
  font-weight: 800;
  color: var(--tile);
  font-size: 13px;
}
.path-card.theory-card { border-color: #cfe4e0; background: linear-gradient(180deg, #eef7f5, #fff); }
.path-card.theory-card b { background: #0d6e6a; }
.path-card.practice-card { border-color: #f0ddc0; background: linear-gradient(180deg, #fbf6ea, #fff); }
.path-card.practice-card b { background: #c97816; }
.howto { margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.55; }
.howto li { margin: 8px 0; }
.task-dots { max-height: 160px; overflow: auto; }
.task-dots a.bad-dot { background: #fde8e6; }
.answer-form { margin-top: 12px; }
.answer-form input[type="text"] { width: min(100%, 320px); }
.split { display: grid; grid-template-columns: 1.2fr .8fr; gap: 16px; }
.card-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.ach-list, .plain-list, .timeline, .result-list, .attempt-feed { list-style: none; padding: 0; margin: 0; }
.ach-list li, .plain-list li, .timeline li, .result-list li {
  padding: 10px 0; border-bottom: 1px solid var(--line);
}
.result-list li { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.ach-list li { opacity: .45; }
.ach-list li.on { opacity: 1; }
.ach-list li span, .ach-list li small { display: block; color: var(--muted); font-size: 13px; }
.plain-list li, .timeline li { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.timeline time { color: var(--muted); min-width: 140px; font-size: 13px; }
.pill { display: inline-flex; border-radius: 99px; padding: 3px 8px; font-size: 12px; font-weight: 700; background: #efe6d8; }
.pill.ok { background: #e1f4e8; color: var(--ok); }
.pill.bad { background: #fde8e6; color: var(--bad); }
.pill.lock { background: #ece7df; color: var(--muted); }
.path { display: grid; gap: 12px; }
.path-card {
  display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center;
  padding: 18px; border-radius: 16px; background: var(--paper); border: 1px solid var(--line);
  color: inherit; text-decoration: none;
}
.path-card:hover { border-color: var(--teal); text-decoration: none; }
.path-card.disabled { opacity: .55; }
.path-card b {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: var(--teal); color: #fff;
}
.path-card .bar { margin-top: 8px; max-width: 280px; }
.path-progress { margin: 4px 0 0; font-size: 14px; font-weight: 700; color: var(--teal-dark); }
.goals-card .card-head { margin-bottom: 4px; }
.goals-card .card-head h2 { margin-bottom: 2px; }
.goals-grid {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  counter-reset: none;
}
.goals-grid li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  margin: 0;
  padding: 14px 16px;
  background: linear-gradient(180deg, #fff, #f7f3eb);
  border: 1px solid var(--line);
  border-radius: 14px;
}
.goal-n {
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--teal); color: #fff;
  font-weight: 800; font-size: 13px; line-height: 1;
  box-shadow: 0 0 0 4px rgba(13, 110, 106, 0.08);
}
.goal-text, .goal-text p {
  margin: 0;
  font-family: Manrope, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}
.goal-text p { display: inline; }
.md-body { font-family: Literata, Georgia, serif; line-height: 1.65; }
.md-body h1, .md-body h2, .md-body h3, .md-body h4 { font-family: Manrope, sans-serif; }
.md-body table { width: 100%; border-collapse: collapse; margin: 12px 0; }
.md-body td, .md-body th { border: 1px solid var(--line); padding: 6px 8px; }
.md-body img { max-width: 100%; border-radius: 12px; }

.theory-article { padding: 28px 32px 36px; }
.theory-article .theory-title {
  font-size: clamp(1.7rem, 3vw, 2.15rem);
  letter-spacing: -0.04em;
  margin: 0 0 12px;
}
.theory-article > p { margin: 0 0 1em; }
.theory-article > p:first-of-type { font-size: 1.08rem; color: #334248; }
.theory-goals-lead { font-weight: 700; font-family: Manrope, sans-serif; color: var(--teal-dark); }
.theory-goals {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: grid;
  gap: 8px;
}
.theory-goals li {
  position: relative;
  margin: 0;
  padding: 10px 14px 10px 42px;
  background: linear-gradient(180deg, #fff, #f4faf8);
  border: 1px solid #d7ebe6;
  border-radius: 12px;
  font-family: Manrope, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}
.theory-goals li::before {
  content: "";
  position: absolute;
  left: 14px; top: 13px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: inset 0 0 0 4px #fff, 0 0 0 1px #cfe8e4;
}
.theory-mini {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 36px 0 18px;
  padding: 16px 18px;
  background: linear-gradient(135deg, #0d6e6a 0%, #163a40 100%);
  color: #fff;
  border-radius: 16px;
  letter-spacing: -0.03em;
  line-height: 1.3;
}
.theory-mini .mini-num {
  flex: none;
  width: 36px; height: 36px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: rgba(255,255,255,.16);
  font-size: 1.05rem;
  font-weight: 800;
}
.theory-mini .mini-title { padding-top: 6px; font-size: 1.15rem; }
.theory-callout {
  margin: 14px 0;
  padding: 14px 16px 14px 18px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 1px 0 rgba(27, 42, 50, 0.03);
}
.theory-callout > :first-child { margin-top: 0; }
.theory-callout > :last-child { margin-bottom: 0; }
.theory-callout > p:first-child > strong:first-child {
  display: inline-flex;
  align-items: center;
  margin: 0 8px 6px 0;
  padding: 3px 10px;
  border-radius: 999px;
  font-family: Manrope, sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
  line-height: 1.3;
}
.theory-callout.is-def {
  background: #f3faf8;
  border-color: #cfe8e2;
  border-left: 4px solid var(--teal);
}
.theory-callout.is-def > p:first-child > strong:first-child { background: #d8efe9; color: var(--teal-dark); }
.theory-callout.is-important, .theory-callout.is-note {
  background: #fff8ee;
  border-color: #f0ddc0;
  border-left: 4px solid var(--amber);
}
.theory-callout.is-important > p:first-child > strong:first-child,
.theory-callout.is-note > p:first-child > strong:first-child { background: #f8e6c8; color: #8a5410; }
.theory-callout.is-trap {
  background: #fdf4f3;
  border-color: #f3c9c6;
  border-left: 4px solid var(--bad);
}
.theory-callout.is-trap > p:first-child > strong:first-child { background: #f8d4d1; color: #9a2f2a; }
.theory-callout.is-rule, .theory-callout.is-algo {
  background: #f7f3eb;
  border-color: #e4d9c8;
  border-left: 4px solid #1b2a32;
}
.theory-callout.is-rule > p:first-child > strong:first-child,
.theory-callout.is-algo > p:first-child > strong:first-child { background: #e8e0d2; color: var(--ink); }
.theory-callout.is-example {
  background: #fff;
  border-style: dashed;
  border-left: 4px dashed var(--teal);
}
.theory-callout.is-example > p:first-child > strong:first-child { background: #e7f3f1; color: var(--teal-dark); }
.theory-callout.is-solve {
  background: #eef8f2;
  border-color: #cfe8d9;
  border-left: 4px solid var(--ok);
}
.theory-callout.is-solve > p:first-child > strong:first-child { background: #d5eedf; color: #1f6b42; }
.theory-term {
  padding: 8px 12px 8px 14px;
  border-left: 3px solid var(--teal);
  background: #f7fbfa;
  border-radius: 0 12px 12px 0;
}
.theory-term > strong:first-child {
  font-family: Manrope, sans-serif;
  color: var(--teal-dark);
}
.theory-summary {
  margin: 28px 0 16px;
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
}
.theory-summary h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}
.theory-summary.is-formulas { background: #f3faf8; border-color: #cfe8e2; }
.theory-summary.is-dontmix { background: #fdf4f3; border-color: #f3c9c6; }
.theory-summary.is-types { background: #f7f3eb; }
.theory-article .katex-display {
  margin: 12px 0;
  padding: 12px 14px;
  background: #f7f3eb;
  border-radius: 12px;
}
.theory-article ol, .theory-article ul { padding-left: 1.2em; }
.theory-article li { margin: .25em 0; }
.theory-callout ol, .theory-callout ul { margin: 8px 0 0; }
.theory-progress { background: rgba(243,238,228,.92); padding: 10px 0 8px; backdrop-filter: blur(8px); }
.theory-progress-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 6px; font-size: 13px; gap: 10px; }
.to-top {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 40;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-width: 48px; min-height: 48px; padding: 10px 16px;
  border: 0; border-radius: 999px;
  background: var(--teal); color: #fff;
  font: inherit; font-weight: 800; font-size: 14px;
  box-shadow: 0 10px 24px rgba(13, 110, 106, .28);
  cursor: pointer;
  opacity: 0; pointer-events: none;
  transform: translateY(10px);
  transition: opacity .2s ease, transform .2s ease;
}
.to-top.is-visible {
  opacity: 1; pointer-events: auto; transform: none;
}
.to-top:hover { background: var(--teal-dark); }
.sticky-actions {
  position: sticky; bottom: max(12px, env(safe-area-inset-bottom));
  display: flex; justify-content: flex-end; gap: 10px; z-index: 15;
  padding: 10px 0 4px;
  background: linear-gradient(180deg, transparent, var(--bg) 36%);
}
.q-card { min-inline-size: 0; padding-top: 22px; }
.q-card legend {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  float: left; width: 100%;
  margin: 0 0 4px; padding: 0;
  font-weight: 700;
}
.q-card::after { content: ""; display: block; clear: both; }
.q-num { background: var(--ink); color: #fff; border-radius: 8px; padding: 3px 8px; font-size: 13px; letter-spacing: 0.02em; }
.q-topic { color: var(--muted); font-weight: 600; }
.q-prompt {
  font-family: Manrope, system-ui, sans-serif;
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 12px 0 4px;
  padding: 12px 14px;
  background: #f7f3eb;
  border-radius: 12px;
  border-left: 4px solid var(--teal);
}
.q-prompt p { margin: 0 0 .45em; font-family: inherit; font-size: inherit; font-weight: inherit; line-height: inherit; }
.q-prompt p:last-child { margin-bottom: 0; }
.opts { display: grid; gap: 8px; margin-top: 14px; }
.opt {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; cursor: pointer;
  background: #fff;
}
.opt .md-body, .opt .md-body p {
  margin: 0; font-family: Manrope, system-ui, sans-serif; font-size: 15px; line-height: 1.45;
}
.opt .md-body p { display: inline; }
.opt:has(input:checked) { border-color: var(--teal); background: #f0f8f6; }
.diff-filters {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 0 0 14px;
}
.diff-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 999px; padding: 8px 14px;
  border: 1px solid var(--line); background: #fff;
  color: inherit; font-weight: 800; text-decoration: none;
  text-align: center;
}
.diff-btn span {
  min-width: 1.4em; font-size: 12px; font-weight: 700; color: var(--muted);
}
.diff-btn:hover { text-decoration: none; transform: translateY(-1px); }
.diff-btn.empty { opacity: .55; }
.diff-easy { border-color: #b7dcc8; }
.diff-medium { border-color: #ead3a8; }
.diff-hard { border-color: #ecc4c1; }
.diff-btn.on { color: #fff; background: var(--teal); border-color: var(--teal); }
.diff-btn.on span { color: rgba(255,255,255,.88); }
.diff-easy.on { background: var(--ok); border-color: var(--ok); }
.diff-medium.on { background: var(--amber); border-color: var(--amber); }
.diff-hard.on { background: var(--bad); border-color: var(--bad); }
.task-dots { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 16px; }
.task-dots a {
  min-width: 52px; padding: 8px 12px; border-radius: 12px; border: 1px solid var(--line);
  background: #fff; text-align: center; color: inherit; font-weight: 800;
}
.task-dots a.on { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(13,110,106,.12); }
.task-dots a.ok { background: #eef8f2; }
.task-dots a.wait { background: #f8efd8; }
.pill.wait { background: #f8efd8; color: var(--amber); }
.wait-card { background: #fbf6ea; }
.tips ul { margin: 8px 0 0 18px; color: var(--muted); }
.drop {
  position: relative;
  display: grid; place-items: center; min-height: 120px; border: 2px dashed var(--line);
  border-radius: 16px; cursor: pointer; background: #fbf7f0;
  padding: 16px;
  text-align: center;
}
.drop input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  font-size: 0;
}
.photo-preview-wrap {
  position: relative;
  display: inline-block;
  max-width: min(100%, 280px);
}
.photo-actions {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin: 14px 0 4px;
}
.photo-actions[hidden] { display: none !important; }
#photoPreview { display: block; max-width: 100%; max-height: 280px; margin: 0; border-radius: 12px; }
.upload-form {
  display: flex;
  flex-direction: column;
}
.upload-submit {
  align-self: center;
  margin-top: 20px;
}
#waitHint { text-align: center; }
.attempt-feed li { display: grid; gap: 8px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.thumb img { max-width: 220px; border-radius: 10px; }
.ai-feedback { white-space: pre-wrap; }
.cell-stack { display: flex; flex-direction: column; gap: 6px; min-width: 9rem; }
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 700;
  color: inherit;
  line-height: 1.3;
}
a.chip:hover { text-decoration: none; border-color: var(--teal); }
.chip.ok { background: #eef8f2; border-color: #cfe8d9; color: var(--ok); }
.chip.bad { background: #fde8e6; border-color: #f3c9c6; color: var(--bad); }
.progress-table { min-width: 760px; }
.progress-table td, .progress-table th { vertical-align: top; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.inline { display: inline; }
.nowrap { white-space: nowrap; }
.form-card label, .auth-form label { display: grid; gap: 6px; margin: 12px 0; font-weight: 600; }
input, select, textarea {
  font: inherit; font-size: 16px; padding: 10px 12px; border-radius: 12px;
  border: 1px solid var(--line); background: #fff; max-width: 100%;
}
.search { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.search input { flex: 1; min-width: 0; }
.flashes { display: grid; gap: 8px; margin-bottom: 12px; }
.flash { padding: 10px 12px; border-radius: 12px; background: #efe6d8; }
.flash-success { background: #e1f4e8; }
.flash-danger, .flash-warning { background: #fde8e6; }
.flash-info { background: #e7f1f8; }
.toasts {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  z-index: 80;
  display: grid;
  gap: 8px;
  width: min(360px, calc(100% - 24px));
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  padding: 12px 16px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.35;
  box-shadow: 0 12px 32px rgba(27, 42, 50, 0.16);
  border: 1px solid transparent;
  animation: toast-in .28s ease-out;
}
.toast.toast-out { animation: toast-out .22s ease-in forwards; }
.toast-success { background: #e1f4e8; color: var(--ok); border-color: #cfe8d9; }
.toast-danger, .toast-warning { background: #fde8e6; color: var(--bad); border-color: #f3c9c6; }
.toast-info { background: #e7f1f8; color: #1b4a6b; border-color: #c9e0ef; }
.toast-message, .toast- { background: var(--paper); border-color: var(--line); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(-10px) translateX(12px); }
  to { opacity: 1; transform: none; }
}
@keyframes toast-out {
  from { opacity: 1; transform: none; }
  to { opacity: 0; transform: translateY(-8px) translateX(12px); }
}
.actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.auth-body { display: grid; place-items: center; min-height: 100vh; padding: 12px; }
.auth-wrap { width: min(920px, calc(100% - 24px)); margin: 24px auto; }
.auth-card { display: grid; grid-template-columns: 1.1fr .9fr; overflow: hidden; }
.auth-side { padding: 36px; background: linear-gradient(160deg, #0d6e6a, #163a40); color: #fff; }
.auth-form { padding: 36px; }
.opts-admin { list-style: none; padding: 0; }
.opts-admin li { padding: 8px; border-radius: 10px; margin: 6px 0; border: 1px solid var(--line); }
.opts-admin li.exp { background: #eef8f2; }
.opts-admin li.sel { outline: 2px solid var(--amber); }
.split-photo { display: grid; grid-template-columns: 1fr 280px; gap: 16px; align-items: start; }
.split-photo img { width: 100%; border-radius: 12px; }
.check-wrap { margin-top: 16px; overflow-x: auto; }
.check-wrap h4 { font-size: 1rem; margin-bottom: 8px; }
.check-table { font-size: 14px; }
.check-table th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.check-table tr.ok td:last-child { color: var(--ok); }
.check-table tr.bad td:last-child { color: var(--bad); }
.check-mark { font-weight: 800; }
.check-note { color: var(--ink); font-weight: 500; margin-top: 4px; white-space: pre-wrap; }
.check-conclusion { margin-top: 12px; padding: 10px 12px; background: #eef8f2; border-radius: 12px; }
.ok-card { background: #eef8f2; }
.end-cta { margin: 24px 0 48px; }
.check { display: flex !important; align-items: center; gap: 8px; }

@media (max-width: 960px) {
  .stat-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .wrap, .topbar { width: min(1120px, calc(100% - 20px)); }
  .stat-grid, .split, .auth-card, .split-photo, .goals-grid { grid-template-columns: 1fr; }
  .topbar { border-radius: 20px; flex-wrap: wrap; gap: 10px; padding: 10px 12px; }
  .topnav { margin-left: 0; }
  .who { width: 100%; justify-content: space-between; }
  .hero-card { flex-direction: column; align-items: flex-start; padding: 20px; }
  .hero-card.compact { padding: 16px; }
  .stat.mini { text-align: left; min-width: 0; }
  .auth-side, .auth-form { padding: 24px; }
  .timeline time { min-width: 0; }
  .timeline li, .plain-list li { align-items: flex-start; }
}

@media (max-width: 640px) {
  body { background-attachment: scroll; }
  .wrap { margin-bottom: 40px; }
  .card, .paper { padding: 16px; margin: 12px 0; }
  .hero-card { padding: 16px; }
  h1 { font-size: 1.45rem; }
  .brand small { font-size: 11px; }
  .topnav { width: 100%; gap: 12px; }
  .page-nav { gap: 8px; }
  .nav-step { margin-left: 0; width: 100%; }
  .crumb-list span { max-width: 24ch; }
  .path-card {
    grid-template-columns: auto 1fr;
    gap: 10px 12px;
    padding: 14px;
  }
  .path-card > .pill { grid-column: 2; justify-self: start; }
  .path-card .bar { max-width: none; }
  .q-prompt { font-size: 1.05rem; padding: 10px 12px; }
  .opt { padding: 12px; }
  .sticky-actions { justify-content: stretch; }
  .sticky-actions .btn, .actions .btn, .upload-submit, .end-cta .btn { width: 100%; }
  .upload-submit { max-width: none; }
  .photo-actions { flex-direction: column; align-items: stretch; }
  .photo-preview-wrap, #photoPreview, .thumb img { max-width: 100%; }
  .topic-grid { grid-template-columns: 1fr; }
  .lesson-grid { grid-template-columns: repeat(2, 1fr); }
  .lesson-tile { min-height: 104px; padding: 12px; }
  .search { flex-direction: column; }
  .search .btn { width: 100%; }
  .table-wrap.card { padding: 0; }
  .table-wrap table { min-width: 560px; }
  .check-table { min-width: 480px; }
  .nowrap { white-space: normal; }
  td .inline { display: flex; flex-wrap: wrap; gap: 6px; }
}

@media (max-width: 400px) {
  .lesson-grid { grid-template-columns: 1fr; }
  .theory-article { padding: 20px 16px 28px; }
  .theory-mini { padding: 14px; gap: 10px; }
  .theory-mini .mini-title { font-size: 1.05rem; padding-top: 4px; }
  .task-dots a { min-width: 46px; padding: 8px 10px; }
}