/* Base layout and components. Design tokens and the visual layer live in design.css. */
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.4em; }
h2 { font-size: 1.35rem; letter-spacing: -0.01em; }
h3 { font-size: 1.02rem; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
code { font: 0.88em ui-monospace, "Cascadia Code", Consolas, monospace; background: var(--surface-2); padding: 0.1em 0.35em; border-radius: 5px; }
kbd { font: 600 0.7rem ui-monospace, Consolas, monospace; padding: 1px 5px; border-radius: 5px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-3); }
.muted { color: var(--ink-2); }
.small { font-size: 0.85rem; }
.row { display: flex; align-items: center; flex-wrap: wrap; }
.gap { gap: 10px; }
.center { justify-content: center; text-align: center; }
.t-blind { color: var(--m-blind); font-style: normal; font-weight: 600; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; font-weight: 700; color: var(--accent); margin: 0 0 10px; }
.side-label { display: block; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.7rem; font-weight: 700; color: var(--ink-3); margin: 0 0 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid transparent; border-radius: 10px; padding: 9px 16px;
  font-weight: 600; font-size: 0.92rem; cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, transform 0.05s, opacity 0.15s;
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover:not(:disabled) { background: var(--accent-2); }
.btn-ghost { background: var(--surface); border-color: var(--line); }
.btn-ghost:hover:not(:disabled) { border-color: var(--line-strong); background: var(--surface-2); }
.btn-danger { background: var(--m-blind); color: #fff; }
.btn-danger:hover:not(:disabled) { filter: brightness(1.08); }
.btn.danger { color: var(--m-blind); }
.btn-sm { padding: 6px 11px; font-size: 0.84rem; border-radius: 8px; }
.btn-lg { padding: 12px 22px; font-size: 1rem; border-radius: 12px; }
.btn-block { width: 100%; }
.btn kbd { margin-left: 4px; background: transparent; color: inherit; border-color: currentColor; opacity: 0.6; }
.icon-btn {
  display: inline-grid; place-items: center; width: 34px; height: 34px; flex: none;
  border: 0; border-radius: 9px; background: transparent; color: var(--ink-2); cursor: pointer; font-size: 1rem;
}
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.chip {
  border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 6px 13px;
  font-size: 0.85rem; cursor: pointer; color: var(--ink-2); transition: all 0.15s;
}
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip-quiet { border-style: dashed; }
.tag {
  display: inline-flex; align-items: center; gap: 6px; font-size: 0.74rem; font-weight: 600;
  padding: 3px 9px; border-radius: 999px; color: var(--c);
  background: color-mix(in srgb, var(--c) 13%, transparent);
}
.tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--c); }
.pill { font-size: 0.72rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.field { display: grid; gap: 6px; font-size: 0.85rem; font-weight: 600; color: var(--ink-2); }
input[type="text"], input:not([type]), textarea, select {
  width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: 10px;
  padding: 10px 12px; outline: none; transition: border-color 0.15s, box-shadow 0.15s; font-weight: 400; color: var(--ink);
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
select { width: auto; cursor: pointer; }

/* ---------- shell ---------- */
.app { display: grid; grid-template-columns: 256px 1fr; height: 100vh; height: 100dvh; }
.sidebar {
  background: var(--surface); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 12px; padding: 18px 14px; min-height: 0;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--display); font-weight: 800; font-size: 1.4rem; letter-spacing: -0.02em; padding: 2px 6px 8px; }
.brand-mark { width: 30px; height: 30px; }
.sidebar .side-label { margin: 10px 8px 0; }
.subject-list { display: flex; flex-direction: column; gap: 2px; overflow-y: auto; flex: 1; min-height: 0; }
.subject-link { display: flex; align-items: center; gap: 10px; padding: 8px 9px; border-radius: 9px; text-decoration: none; color: var(--ink-2); font-weight: 500; font-size: 0.92rem; }
.subject-link:hover { background: var(--surface-2); color: var(--ink); }
.subject-link.active { background: var(--accent-soft); color: var(--ink); }
.subject-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.subject-ring {
  --pct: 0; flex: none; width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--m-solid) calc(var(--pct) * 1%), var(--surface-3) 0);
  -webkit-mask: radial-gradient(circle, transparent 52%, #000 54%); mask: radial-gradient(circle, transparent 52%, #000 54%);
}
.subject-ring.lg { width: 52px; height: 52px; -webkit-mask: none; mask: none; position: relative; }
.subject-ring.lg::after { content: ""; position: absolute; inset: 5px; border-radius: 50%; background: var(--surface); }
.subject-ring.lg b { position: relative; z-index: 1; font-size: 0.78rem; }
.pip { font-size: 0.7rem; font-weight: 700; min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; display: grid; place-items: center; }
.pip-blind { background: var(--m-blind); color: #fff; }
.side-empty { color: var(--ink-3); font-size: 0.85rem; padding: 4px 9px; }
.side-foot { font-size: 0.78rem; color: var(--ink-3); display: flex; align-items: center; gap: 7px; padding: 8px 6px 0; border-top: 1px solid var(--line); }
.dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.dot-ok { background: var(--ok); } .dot-warn { background: var(--m-shaky); } .dot-bad { background: var(--bad); }
.scrim { display: none; }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.topbar {
  display: flex; align-items: center; gap: 18px; padding: 0 24px; min-height: 60px;
  border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 85%, transparent);
}
.topbar-home { border-bottom: 0; min-height: 0; padding: 0; }
.nav-toggle { display: none; }
.topbar-title { display: flex; align-items: center; gap: 2px; min-width: 0; }
.topbar-title h1 { font-family: var(--display); font-weight: 800; font-size: 1.25rem; margin: 0; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 32ch; }
.tabs { display: flex; gap: 2px; margin-left: auto; overflow-x: auto; scrollbar-width: none; align-self: stretch; }
.tabs::-webkit-scrollbar { display: none; }
.tab {
  display: flex; align-items: center; gap: 6px; padding: 0 12px; text-decoration: none; color: var(--ink-2);
  font-weight: 600; font-size: 0.9rem; border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--ink); border-bottom-color: var(--accent); }
.tab-badge:empty { display: none; }
.tab-badge { font-size: 0.7rem; font-weight: 700; min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; display: grid; place-items: center; background: var(--accent); color: #fff; }
.tab-badge.badge-blind { background: var(--m-blind); }
.tab-badge.badge-muted { background: var(--surface-3); color: var(--ink-2); }
.view { flex: 1; min-height: 0; overflow-y: auto; }
.view[data-tab="chat"] { overflow: hidden; display: flex; }
.banner { margin: 12px 24px 0; padding: 10px 14px; border-radius: 10px; background: var(--accent-soft); font-size: 0.88rem; }
.banner-bad { background: color-mix(in srgb, var(--m-blind) 14%, transparent); }
.home .banner { margin: 0 0 24px; }

.page { max-width: 1080px; margin: 0 auto; padding: 28px 24px 64px; }
.page.narrow { max-width: 760px; }
.page.wide { max-width: 1280px; }
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; margin-bottom: 18px; }
.page-head p { margin: 0; max-width: 60ch; }
.empty { text-align: center; padding: 56px 20px; border: 1px dashed var(--line-strong); border-radius: var(--radius); margin-top: 18px; }
.empty p { max-width: 52ch; margin: 0 auto; }
.callout { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 16px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); margin: 16px 0; font-size: 0.92rem; }
.callout-blind { border-color: color-mix(in srgb, var(--m-blind) 40%, transparent); background: color-mix(in srgb, var(--m-blind) 7%, var(--surface)); }

/* ---------- home ---------- */
.home { overflow-y: auto; flex: 1; padding: 48px 32px 80px; max-width: 1120px; margin: 0 auto; width: 100%; }
.hero { text-align: center; padding: 28px 0 56px; }
.hero h1 { font-family: var(--display); font-weight: 800; font-size: clamp(2.6rem, 6vw, 4.4rem); letter-spacing: -0.035em; line-height: 1.02; margin: 0 0 18px; }
.hero h1 em { font-style: normal; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { font-size: 1.12rem; color: var(--ink-2); max-width: 60ch; margin: 0 auto 30px; }
.start { display: flex; gap: 8px; max-width: 720px; margin: 0 auto; padding: 7px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.start input { border: 0; box-shadow: none !important; font-size: 1rem; padding: 10px 12px; background: transparent; }
.start .attach { flex: none; }
.examples { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.diff { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 36px; box-shadow: var(--shadow); }
.diff-head { max-width: 62ch; margin-bottom: 26px; }
.diff-head h2 { font-family: var(--display); font-size: 2rem; letter-spacing: -0.02em; }
.diff-head p { margin: 0; }
.diff-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.diff-grid article { padding: 18px; border-radius: 14px; background: var(--bg); }
.diff-grid p { margin: 0; color: var(--ink-2); font-size: 0.9rem; }
.diff-ico { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; margin-bottom: 12px; font-size: 1.1rem; color: var(--c); background: color-mix(in srgb, var(--c) 14%, transparent); }
.home-subjects { margin-top: 44px; }
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.subject-card { display: flex; align-items: center; gap: 14px; padding: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; text-decoration: none; transition: border-color 0.15s, transform 0.15s; }
.subject-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.subject-card strong { display: block; }
.subject-card small { color: var(--ink-3); }

/* ---------- feedback ---------- */
.toast-host { position: fixed; bottom: 96px; left: 50%; transform: translateX(-50%); display: grid; gap: 8px; z-index: 100; width: min(440px, calc(100vw - 32px)); }
.toast { background: var(--ink); color: var(--bg); padding: 11px 16px; border-radius: 11px; box-shadow: var(--shadow-lg); font-size: 0.9rem; animation: rise 0.25s ease; transition: opacity 0.35s, transform 0.35s; }
.toast-success { background: var(--m-solid); color: #fff; }
.toast-error { background: var(--m-blind); color: #fff; }
.toast-warn { background: var(--m-shaky); color: #fff; }
.toast.out { opacity: 0; transform: translateY(8px); }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } }
.busy-pill { position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 90; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-lg); border-radius: 999px; padding: 8px 16px; animation: rise 0.2s ease; }
.working { display: inline-flex; align-items: center; gap: 10px; font-size: 0.88rem; color: var(--ink-2); }
.dots, .typing { display: inline-flex; gap: 4px; align-items: center; }
.dots i, .typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: blink 1.1s infinite ease-in-out; }
.dots i:nth-child(2), .typing i:nth-child(2) { animation-delay: 0.15s; }
.dots i:nth-child(3), .typing i:nth-child(3) { animation-delay: 0.3s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.25; transform: scale(0.8); } 40% { opacity: 1; transform: scale(1); } }

.modal { border: 0; padding: 0; border-radius: 18px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow-lg); width: min(480px, calc(100vw - 32px)); max-height: calc(100dvh - 48px); }
.modal:has(.wide) { width: min(720px, calc(100vw - 32px)); }
.modal::backdrop { background: rgb(10 10 12 / 0.45); backdrop-filter: blur(2px); }
.modal-body { padding: 24px; display: grid; gap: 14px; }
.modal-body h2 { margin: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.preview { white-space: pre-wrap; font: 0.82rem/1.5 ui-monospace, Consolas, monospace; background: var(--bg); padding: 14px; border-radius: 10px; max-height: 55vh; overflow: auto; margin: 0; }
.fix-q { background: var(--bg); border-radius: 12px; padding: 12px 14px; font-size: 0.92rem; }
.fix-q p { margin: 4px 0; }
.fix-q .x { color: var(--m-blind); font-weight: 700; }
.fix-q .ok { color: var(--m-solid); font-weight: 700; }

/* ---------- prose ---------- */
.prose { overflow-wrap: anywhere; }
.prose > :first-child { margin-top: 0; }
.prose > :last-child { margin-bottom: 0; }
.prose p, .prose ul, .prose ol { margin: 0 0 0.75em; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 0.2em 0; }
.prose h1 { font-family: var(--display); font-size: 1.9rem; letter-spacing: -0.02em; margin: 0.2em 0 0.5em; }
.prose h2 { font-size: 1.25rem; margin: 1.4em 0 0.5em; }
.prose h3 { font-size: 1.05rem; margin: 1.2em 0 0.4em; }
.prose blockquote { margin: 0.8em 0; padding: 8px 14px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; }
.prose blockquote p { margin: 0; }
.prose pre { background: var(--surface-2); padding: 12px 14px; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 0.8em 0; font-size: 0.92rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 1.4em 0; }
.prose .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

/* ---------- sources ---------- */
.dropzone { display: grid; place-items: center; gap: 4px; text-align: center; padding: 40px 20px; border: 2px dashed var(--line-strong); border-radius: var(--radius); background: var(--surface); cursor: pointer; transition: all 0.15s; margin-bottom: 12px; }
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.doc-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; }
.doc { display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.doc-type { flex: none; width: 42px; height: 42px; border-radius: 9px; display: grid; place-items: center; font-size: 0.66rem; font-weight: 800; background: var(--accent-soft); color: var(--accent); }
.doc-main { flex: 1; min-width: 0; }
.doc-main strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-main small { color: var(--ink-3); }

/* ---------- chat ---------- */
.chat { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.chat-scroll { flex: 1; overflow-y: auto; }
.chat-inner { max-width: 800px; margin: 0 auto; padding: 28px 24px 12px; display: grid; gap: 22px; }
.chat-empty { text-align: center; padding: 6vh 0 0; }
.chat-empty p { max-width: 52ch; margin: 0 auto 22px; }
.suggest { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.msg { display: flex; gap: 12px; }
.msg-user { justify-content: flex-end; }
.bubble { background: var(--ink); color: var(--bg); padding: 10px 15px; border-radius: 16px 16px 4px 16px; max-width: 80%; overflow-wrap: anywhere; }
.avatar { flex: none; width: 30px; height: 30px; }
.avatar svg { width: 100%; height: 100%; }
.msg-body { flex: 1; min-width: 0; padding-top: 3px; }
.msg-error { color: var(--m-blind); font-size: 0.9rem; margin: 8px 0 0; }
.action-card { display: flex; align-items: center; gap: 12px; margin-top: 12px; padding: 10px 12px; border: 1px solid var(--line); background: var(--surface); border-radius: 12px; max-width: 440px; }
.action-card.error { border-color: color-mix(in srgb, var(--m-blind) 40%, transparent); }
.action-ico { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); flex: none; }
.action-text { flex: 1; min-width: 0; }
.action-text strong { display: block; font-size: 0.9rem; }
.action-text small { color: var(--ink-3); }
.composer { border-top: 1px solid var(--line); background: var(--bg); padding: 10px 24px 16px; }
.quick { max-width: 800px; margin: 0 auto 8px; display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.quick .chip { flex: none; padding: 4px 11px; font-size: 0.8rem; }
.composer-box { max-width: 800px; margin: 0 auto; display: flex; align-items: flex-end; gap: 6px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 6px; box-shadow: var(--shadow); }
.composer-box:focus-within { border-color: var(--accent); }
.composer-box textarea { border: 0; box-shadow: none !important; resize: none; padding: 7px 4px; max-height: 200px; background: transparent; }
.composer-box .icon-btn { cursor: pointer; }

/* ---------- split (guides) ---------- */
.split { display: grid; grid-template-columns: 290px 1fr; min-height: 100%; }
.split-side { border-right: 1px solid var(--line); padding: 20px 16px; display: grid; align-content: start; gap: 18px; }
.new-guide { display: grid; gap: 8px; }
.side-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.side-item { width: 100%; text-align: left; border: 0; background: transparent; padding: 9px 10px; border-radius: 9px; cursor: pointer; }
.side-item:hover { background: var(--surface-2); }
.side-item.active { background: var(--accent-soft); }
.side-item strong { display: block; font-size: 0.9rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-item small { color: var(--ink-3); }
.split-main { padding: 24px 32px 64px; min-width: 0; }
.doc-toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.guide-doc { max-width: 760px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 36px 40px; box-shadow: var(--shadow); }

/* ---------- flashcards ---------- */
.deck-hero { display: flex; align-items: center; gap: 28px; padding: 22px 26px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); flex-wrap: wrap; }
.deck-stat b { display: block; font-family: var(--display); font-size: 2rem; line-height: 1; }
.deck-stat span { font-size: 0.8rem; color: var(--ink-3); }
.deck-cta { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }
.gen-row { display: flex; gap: 8px; margin: 18px 0; }
.card-table { display: grid; gap: 8px; }
.card-row { display: grid; grid-template-columns: 1fr 1fr auto; gap: 18px; padding: 12px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; font-size: 0.9rem; align-items: start; }
.card-q { font-weight: 600; }
.card-a { color: var(--ink-2); }
.card-meta { display: flex; align-items: center; gap: 8px; justify-self: end; }
.card-meta small { color: var(--ink-3); white-space: nowrap; }
.card-meta .icon-btn { width: 28px; height: 28px; font-size: 0.8rem; }
.session-top { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.progress { flex: 1; height: 6px; border-radius: 3px; background: var(--surface-3); overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.3s; }
.flash { min-height: 300px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; gap: 18px; padding: 36px 32px; background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); cursor: pointer; outline: none; animation: rise 0.2s ease; }
.flash .tag { align-self: center; }
.flash-front { font-size: 1.3rem; font-weight: 600; max-width: 56ch; }
.flash-back { font-size: 1.05rem; color: var(--ink-2); max-width: 60ch; }
.flash hr { width: 60%; border: 0; border-top: 1px solid var(--line); margin: 0; }
.hint { color: var(--ink-3); font-size: 0.85rem; margin: 0; }
.ratings { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.ratings .btn-block { grid-column: 1 / -1; }
.rate { display: grid; justify-items: center; gap: 2px; padding: 12px 6px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; transition: all 0.15s; }
.rate small { color: var(--ink-3); font-size: 0.78rem; }
.rate kbd { margin-top: 3px; }
.rate:hover { transform: translateY(-1px); }
.rate-again:hover { border-color: var(--m-blind); } .rate-again b { color: var(--m-blind); }
.rate-hard:hover { border-color: var(--m-shaky); } .rate-hard b { color: var(--m-shaky); }
.rate-good:hover { border-color: var(--m-learning); } .rate-good b { color: var(--m-learning); }
.rate-easy:hover { border-color: var(--m-solid); } .rate-easy b { color: var(--m-solid); }
.done-card { padding: 48px 24px; background: var(--surface); border-radius: 22px; border: 1px solid var(--line); margin-top: 8vh; }

/* ---------- quiz ---------- */
.quiz-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.quiz-item { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 12px; text-align: left; padding: 13px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.quiz-item:hover { border-color: var(--line-strong); }
.quiz-item strong { display: block; }
.quiz-item small, .quiz-score { color: var(--ink-3); font-size: 0.85rem; }
.question { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 28px; box-shadow: var(--shadow); display: grid; gap: 18px; animation: rise 0.2s ease; }
.question .tag { justify-self: start; }
.q-text { font-size: 1.15rem; font-weight: 600; }
.options { display: grid; gap: 8px; }
.option { display: flex; align-items: flex-start; gap: 12px; text-align: left; padding: 12px 14px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--bg); cursor: pointer; transition: all 0.12s; }
.option:hover:not(:disabled) { border-color: var(--line-strong); }
.option:disabled { cursor: default; }
.opt-key { flex: none; width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center; font-weight: 700; font-size: 0.8rem; background: var(--surface-3); }
.option.picked { border-color: var(--accent); background: var(--accent-soft); }
.option.picked .opt-key { background: var(--accent); color: #fff; }
.option.correct { border-color: var(--m-solid); background: color-mix(in srgb, var(--m-solid) 10%, var(--surface)); }
.option.correct .opt-key { background: var(--m-solid); color: #fff; }
.option.wrong { border-color: var(--m-blind); background: color-mix(in srgb, var(--m-blind) 9%, var(--surface)); }
.option.wrong .opt-key { background: var(--m-blind); color: #fff; }
.option.dim { opacity: 0.55; }
.confidence { text-align: center; animation: rise 0.2s ease; }
.confidence p { margin: 0 0 10px; font-weight: 600; }
.conf-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.conf { display: grid; justify-items: center; gap: 4px; padding: 12px 8px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--surface); cursor: pointer; transition: all 0.12s; }
.conf:hover { border-color: var(--accent); background: var(--accent-soft); }
.conf-sure b::before { content: "● "; color: var(--accent); }
.conf-think b::before { content: "◐ "; color: var(--accent); }
.conf-guess b::before { content: "○ "; color: var(--accent); }
.reveal { display: grid; gap: 12px; padding: 16px; border-radius: 14px; background: var(--bg); animation: rise 0.2s ease; }
.reveal p { margin: 0; }
.reveal-head { font-weight: 700; font-size: 1.05rem; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.reveal.ok .reveal-head { color: var(--m-solid); }
.reveal.bad .reveal-head { color: var(--m-blind); }
.blind-alert, .root-alert { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding: 12px 14px; border-radius: 12px; font-size: 0.9rem; }
.blind-alert { background: color-mix(in srgb, var(--m-blind) 11%, var(--surface)); border: 1px solid color-mix(in srgb, var(--m-blind) 35%, transparent); }
.blind-alert strong { color: var(--m-blind); }
.blind-alert .btn { margin-left: auto; }
.root-alert { background: color-mix(in srgb, var(--m-learning) 10%, var(--surface)); }
.summary { display: flex; align-items: center; gap: 22px; margin-bottom: 22px; }
.summary h2 { font-family: var(--display); font-size: 1.7rem; }
.summary p { margin: 0; }
.score-ring {
  --pct: 0; flex: none; width: 92px; height: 92px; border-radius: 50%; display: grid; place-items: center; position: relative;
  background: conic-gradient(var(--accent) calc(var(--pct) * 1%), var(--surface-3) 0);
}
.score-ring::after { content: ""; position: absolute; inset: 8px; border-radius: 50%; background: var(--bg); }
.score-ring b { position: relative; z-index: 1; font-family: var(--display); font-size: 1.35rem; }
.score-ring.xl { width: 104px; height: 104px; background: conic-gradient(var(--m-solid) calc(var(--pct) * 1%), var(--surface-3) 0); }
.score-ring.xl::after { background: var(--surface); inset: 9px; }
.score-ring.xl b { font-size: 1.6rem; }
.sum-block { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin-bottom: 14px; }
.sum-block > p { margin: 0 0 10px; font-size: 0.9rem; }
.sum-block.blind { border-color: color-mix(in srgb, var(--m-blind) 40%, transparent); }
.sum-block.blind h3 { color: var(--m-blind); }
.sum-block.root h3 { color: var(--m-learning); }
.sum-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--line); font-weight: 600; }
.review-q { border-top: 1px solid var(--line); padding: 10px 0; }
.review-q summary { display: flex; gap: 10px; align-items: baseline; cursor: pointer; list-style: none; font-size: 0.92rem; }
.review-q summary::-webkit-details-marker { display: none; }
.review-q summary span:nth-child(2) { flex: 1; }
.review-q summary small { color: var(--ink-3); white-space: nowrap; }
.review-q .mark { font-weight: 800; }
.review-q.ok .mark { color: var(--m-solid); }
.review-q.bad .mark { color: var(--m-blind); }
.review-q .prose { padding: 10px 0 4px 22px; font-size: 0.9rem; }
.calib { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; margin: 16px 0; }
.calib-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; text-transform: capitalize; }
.calib p { margin: 4px 0 14px; font-size: 0.9rem; color: var(--ink-2); }
.calib-overconfident .calib-head strong { color: var(--m-blind); }
.calib-underconfident .calib-head strong { color: var(--m-learning); }
.calib-calibrated .calib-head strong { color: var(--m-solid); }
.calib-bars { display: grid; gap: 8px; }
.calib-bar { display: grid; grid-template-columns: 90px 1fr 44px; align-items: center; gap: 10px; font-size: 0.82rem; }
.calib-bar b { text-align: right; }
.bar { position: relative; height: 8px; border-radius: 4px; background: var(--surface-3); }
.bar i { position: absolute; inset: 0 auto 0 0; border-radius: 4px; background: var(--accent); }
.bar u { position: absolute; top: -3px; bottom: -3px; width: 2px; background: var(--ink); opacity: 0.55; }
.calib-mini { margin: 6px 0 0; text-transform: none; }
.calib-mini.calib-overconfident strong { color: var(--m-blind); }
.calib-mini.calib-calibrated strong { color: var(--m-solid); }
.calib-mini.calib-underconfident strong { color: var(--m-learning); }

/* ---------- mastery map ---------- */
.map-top { display: grid; grid-template-columns: minmax(260px, 0.8fr) 1.4fr; gap: 16px; margin-bottom: 16px; }
.overall, .next { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 20px; box-shadow: var(--shadow); }
.overall { display: flex; align-items: center; gap: 20px; }
.overall h2 { font-family: var(--display); margin-bottom: 8px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 12px; font-size: 0.8rem; color: var(--ink-2); }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-item i { width: 9px; height: 9px; border-radius: 3px; background: var(--c); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.step { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px; background: var(--bg); }
.step.first { background: var(--accent-soft); }
.step-ico { flex: none; width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; background: var(--surface); color: var(--accent); font-size: 0.95rem; }
.step-fix .step-ico { color: var(--m-blind); }
.step-review .step-ico { color: var(--m-learning); }
.step-text { flex: 1; min-width: 0; }
.step-text strong { display: block; font-size: 0.92rem; }
.step-text small { display: block; color: var(--ink-2); font-size: 0.8rem; line-height: 1.4; }
.step:not(.first) .step-text small { display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.graph-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); overflow: hidden; }
.graph-head { display: flex; align-items: center; gap: 12px; padding: 14px 18px 0; }
.graph-head .side-label { margin: 0; }
.graph-head .btn { margin-left: auto; }
.graph-scroll { overflow: auto; padding: 4px 0 8px; }
.graph { display: block; margin: 0 auto; }
.graph .edge { fill: none; stroke: var(--line-strong); stroke-width: 1.5; transition: stroke 0.2s; }
.graph .edge.hot { stroke: var(--accent); stroke-width: 2.2; }
.node { cursor: pointer; outline: none; --c: var(--m-new); }
.node.st-blind { --c: var(--m-blind); }
.node.st-shaky { --c: var(--m-shaky); }
.node.st-fading { --c: var(--m-fading); }
.node.st-learning { --c: var(--m-learning); }
.node.st-solid { --c: var(--m-solid); }
.node .box { fill: var(--surface); stroke: color-mix(in srgb, var(--c) 55%, var(--line)); stroke-width: 1.5; transition: all 0.15s; }
.node.st-solid .box { fill: color-mix(in srgb, var(--m-solid) 8%, var(--surface)); }
.node.st-blind .box { fill: color-mix(in srgb, var(--m-blind) 8%, var(--surface)); stroke: var(--m-blind); stroke-width: 2; }
.node.st-new .box { stroke-dasharray: 4 3; stroke: var(--line-strong); }
.node.st-fading .box { stroke-dasharray: 6 3; }
.node:hover .box, .node:focus-visible .box { stroke: var(--c); stroke-width: 2; }
.node.sel .box { stroke: var(--accent); stroke-width: 2.5; }
.node.in-chain .box { stroke: var(--accent); }
.node .stripe { fill: var(--c); }
.node .label { fill: var(--ink); font-size: 12.5px; font-weight: 600; }
.node .meter-bg { fill: var(--surface-3); }
.node .meter { fill: var(--c); }
.node .pct { fill: var(--ink-3); font-size: 10.5px; font-weight: 600; }
.node .pulse { fill: none; stroke: var(--m-blind); stroke-width: 2; opacity: 0.5; animation: pulse 1.8s infinite ease-in-out; transform-box: fill-box; transform-origin: center; }
@keyframes pulse { 0%, 100% { opacity: 0.15; } 50% { opacity: 0.7; } }
.next-tag rect { fill: var(--accent); }
.next-tag text { fill: #fff; font-size: 9.5px; font-weight: 800; letter-spacing: 0.06em; }
.drawer {
  position: fixed; top: 76px; right: 16px; bottom: 16px; width: 360px; z-index: 30;
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow-lg);
  padding: 18px 20px; overflow-y: auto; transform: translateX(calc(100% + 24px)); transition: transform 0.25s ease; display: grid; align-content: start; gap: 12px;
}
.drawer.open { transform: none; }
.drawer h3 { font-family: var(--display); font-size: 1.4rem; margin: 0; }
.drawer p { margin: 0; }
.drawer-head { display: flex; justify-content: space-between; align-items: center; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.stat-grid div { background: var(--bg); border-radius: 10px; padding: 9px 6px; text-align: center; }
.stat-grid b { display: block; font-size: 1.05rem; }
.stat-grid span { font-size: 0.68rem; color: var(--ink-3); }
.drawer-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.rel { display: flex; flex-wrap: wrap; gap: 6px; }
.rel .side-label { width: 100%; margin-bottom: 0; }
.mini-chip { border: 0; cursor: pointer; font-size: 0.8rem; font-weight: 600; padding: 4px 10px; border-radius: 999px; color: var(--c); background: color-mix(in srgb, var(--c) 13%, transparent); }
.root-alert .mini-chip { margin: 2px; }
.map-page.has-drawer .graph-wrap, .map-page.has-drawer .map-top, .map-page.has-drawer .calib { margin-right: 376px; }
.map-empty { padding: 7vh 0; }
.map-empty p { max-width: 54ch; margin: 0 auto 22px; }
.map-skeleton { position: relative; height: 120px; width: 300px; margin: 0 auto 26px; }
.map-skeleton i { position: absolute; width: 62px; height: 24px; border-radius: 7px; background: var(--surface-3); animation: blink 1.4s infinite ease-in-out; animation-delay: calc(var(--i) * 0.12s); }
.map-skeleton.idle i { animation: none; opacity: 0.7; }
.map-skeleton i:nth-child(1) { left: 0; top: 48px; background: color-mix(in srgb, var(--m-solid) 45%, var(--surface-3)); }
.map-skeleton i:nth-child(2) { left: 80px; top: 14px; background: color-mix(in srgb, var(--m-learning) 45%, var(--surface-3)); }
.map-skeleton i:nth-child(3) { left: 80px; top: 82px; }
.map-skeleton i:nth-child(4) { left: 160px; top: 0; }
.map-skeleton i:nth-child(5) { left: 160px; top: 48px; background: color-mix(in srgb, var(--m-blind) 45%, var(--surface-3)); }
.map-skeleton i:nth-child(6) { left: 160px; top: 96px; }
.map-skeleton i:nth-child(7) { left: 240px; top: 48px; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .diff-grid { grid-template-columns: repeat(2, 1fr); }
  .map-top { grid-template-columns: 1fr; }
  .map-page.has-drawer .graph-wrap, .map-page.has-drawer .map-top, .map-page.has-drawer .calib { margin-right: 0; }
}
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: 272px; z-index: 50; transform: translateX(-100%); transition: transform 0.25s ease; box-shadow: var(--shadow-lg); }
  .nav-open .sidebar { transform: none; }
  .nav-open .scrim { display: block; position: fixed; inset: 0; z-index: 40; background: rgb(0 0 0 / 0.35); }
  .nav-toggle { display: inline-grid; }
  .topbar { flex-wrap: wrap; gap: 0 8px; padding: 6px 12px 0; }
  .topbar-home { position: absolute; top: 10px; left: 10px; padding: 0; }
  .topbar-title { flex: 1; }
  .tabs { margin: 0 -12px; padding: 0 6px; width: calc(100% + 24px); min-height: 42px; }
  .banner { margin: 10px 16px 0; }
  .page { padding: 20px 16px 56px; }
  .home { padding: 52px 16px 64px; }
  .start { flex-wrap: wrap; }
  .start input { flex: 1 1 100%; }
  .start .btn { flex: 1; }
  .diff { padding: 22px 18px; }
  .diff-grid { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .split-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .split-main { padding: 18px 16px 56px; }
  .guide-doc { padding: 22px 18px; }
  .chat-inner { padding: 20px 16px 8px; }
  .composer { padding: 8px 12px 12px; }
  .card-row { grid-template-columns: 1fr; gap: 6px; }
  .card-meta { justify-self: start; }
  .gen-row { flex-wrap: wrap; }
  .gen-row input { flex: 1 1 100%; }
  .gen-row .btn { flex: 1; }
  .question { padding: 18px; }
  .deck-cta { margin-left: 0; width: 100%; }
  .deck-cta .btn { flex: 1; }
  .drawer { top: auto; left: 8px; right: 8px; bottom: 8px; width: auto; max-height: 72dvh; transform: translateY(calc(100% + 16px)); }
  .drawer.open { transform: none; }
  .summary { flex-direction: column; text-align: center; }
  .callout { flex-direction: column; align-items: stretch; text-align: center; }
  .overall { flex-direction: column; text-align: center; }
  .legend { justify-content: center; }
}
@media (max-width: 480px) {
  .ratings { grid-template-columns: repeat(2, 1fr); }
  .conf-row { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .flash { padding: 26px 18px; min-height: 240px; }
  .flash-front { font-size: 1.12rem; }
  .bubble { max-width: 90%; }
}

@media print {
  body { overflow: visible; background: #fff; color: #000; }
  .sidebar, .topbar, .banner, .split-side, .doc-toolbar, .toast-host, .busy-pill { display: none !important; }
  .app, .main, .view, .split { display: block; height: auto; overflow: visible; }
  .guide-doc { border: 0; box-shadow: none; padding: 0; max-width: none; }
}

/* late overrides */
.eyebrow.t-blind { color: var(--m-blind); }
.map-page.has-drawer .map-top { grid-template-columns: 1fr; }