:root {
  --bg: #0c1110;
  --bg-deep: #090d0c;
  --surface: #121918;
  --surface-2: #17201e;
  --surface-3: #1d2825;
  --line: rgba(217, 236, 226, 0.1);
  --line-strong: rgba(217, 236, 226, 0.18);
  --text: #eff7ef;
  --muted: #94a69d;
  --faint: #62726b;
  --lime: #c8f169;
  --lime-dark: #92b64a;
  --orange: #f59c68;
  --blue: #8dd9de;
  --purple: #c4adff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.22);
  --radius: 18px;
  --radius-sm: 10px;
  color-scheme: dark;
}

body[data-theme="light"] {
  --bg: #f5f6f1;
  --bg-deep: #eef1ea;
  --surface: #ffffff;
  --surface-2: #f0f4ed;
  --surface-3: #e6ece3;
  --line: rgba(25, 51, 42, 0.1);
  --line-strong: rgba(25, 51, 42, 0.18);
  --text: #17251f;
  --muted: #62756b;
  --faint: #8b9c92;
  --lime: #82aa35;
  --lime-dark: #638a23;
  --orange: #d97842;
  --blue: #3a979e;
  --purple: #8060d0;
  --shadow: 0 20px 60px rgba(44, 73, 52, 0.11);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  transition: background .2s ease, color .2s ease;
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 100; top: -50px; left: 16px; padding: 10px 14px; border-radius: 8px; background: var(--lime); color: #172313; font-weight: 750; transition: top .2s; }
.skip-link:focus { top: 16px; }

.app-shell { min-height: 100vh; display: flex; }
.sidebar { width: 246px; flex: 0 0 246px; position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; justify-content: space-between; padding: 26px 15px 18px; border-right: 1px solid var(--line); background: var(--bg-deep); z-index: 20; }
.sidebar-top { min-height: 0; }
.brand { display: flex; align-items: center; gap: 11px; padding: 0 10px 28px; }
.brand-mark { width: 28px; height: 28px; display: flex; align-items: end; justify-content: center; gap: 3px; padding: 5px; border: 1px solid rgba(200,241,105,.45); border-radius: 9px; background: rgba(200,241,105,.08); }
.brand-mark span { width: 4px; border-radius: 4px; background: var(--lime); }
.brand-mark span:nth-child(1) { height: 9px; opacity: .65; }.brand-mark span:nth-child(2) { height: 15px; }.brand-mark span:nth-child(3) { height: 11px; opacity: .8; }
.brand-type { display: grid; gap: 1px; line-height: 1.1; }.brand-type strong { font-size: 14px; letter-spacing: -.02em; }.brand-type small { color: var(--faint); font-size: 9px; letter-spacing: .14em; text-transform: uppercase; }
.sidebar-label { padding: 0 12px 8px; color: var(--faint); font-size: 9px; font-weight: 750; letter-spacing: .16em; text-transform: uppercase; }.sidebar-label-spaced { margin-top: 29px; }
.primary-nav, .secondary-nav { display: grid; gap: 3px; }
.nav-item { width: 100%; display: flex; align-items: center; gap: 11px; padding: 9px 11px; border: 0; border-radius: 9px; background: transparent; color: var(--muted); text-align: left; cursor: pointer; transition: background .18s ease, color .18s ease; }
.nav-item:hover { background: var(--surface-2); color: var(--text); }.nav-item.is-active { background: rgba(200,241,105,.11); color: var(--lime); }.nav-item.is-active .nav-icon { color: var(--lime); }
.nav-icon { width: 17px; color: var(--faint); font-size: 18px; line-height: 1; text-align: center; }.nav-icon-dot { width: 7px; height: 7px; margin: 0 5px; border-radius: 50%; border: 1px solid currentColor; }.nav-icon-layers { font-size: 21px; transform: rotate(90deg); }
.nav-count { margin-left: auto; color: var(--faint); font-size: 10px; font-variant-numeric: tabular-nums; }.nav-item.is-active .nav-count { color: var(--lime-dark); }.nav-link { display: flex; }
.sidebar-bottom { display: grid; gap: 16px; }.sidebar-progress { display: flex; align-items: center; gap: 12px; padding: 14px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }.sidebar-progress p { margin: 0 0 3px; color: var(--faint); font-size: 10px; }.sidebar-progress strong { font-size: 11px; font-weight: 650; }
.progress-ring { --progress: 0%; width: 43px; height: 43px; display: grid; flex: 0 0 43px; place-items: center; border-radius: 50%; background: conic-gradient(var(--lime) var(--progress), var(--surface-3) 0); position: relative; }.progress-ring::after { content: ""; position: absolute; inset: 4px; border-radius: 50%; background: var(--surface); }.progress-ring span { position: relative; z-index: 1; font-size: 9px; font-weight: 800; }
.reset-button, .text-button { padding: 0; border: 0; background: transparent; color: var(--faint); font-size: 11px; text-align: left; cursor: pointer; }.reset-button:hover, .text-button:hover { color: var(--lime); }.sidebar-footer { display: flex; align-items: center; gap: 6px; color: var(--faint); font-size: 10px; }.status-dot { width: 6px; height: 6px; flex: 0 0 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 3px rgba(200,241,105,.12); }.version-tag { margin-left: auto; color: var(--faint); font-variant-numeric: tabular-nums; }

.main-content { min-width: 0; flex: 1; }.topbar { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 0 clamp(22px, 4vw, 60px); border-bottom: 1px solid var(--line); }.topbar-left, .topbar-actions, .breadcrumb { display: flex; align-items: center; }.topbar-left { gap: 18px; }.breadcrumb { gap: 10px; color: var(--faint); font-size: 12px; }.breadcrumb b { color: var(--line-strong); font-weight: 400; }.breadcrumb strong { color: var(--muted); font-weight: 600; }.menu-button { display: none; width: 38px; height: 38px; padding: 9px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); cursor: pointer; }.menu-button span { display: block; height: 1px; margin: 4px 0; background: var(--muted); }
.topbar-actions { gap: 12px; }.search-shell { width: min(296px, 35vw); position: relative; display: flex; align-items: center; }.search-shell input { width: 100%; height: 36px; padding: 0 35px 0 34px; border: 1px solid var(--line); border-radius: 8px; outline: none; background: var(--surface); color: var(--text); font-size: 12px; transition: border .2s, box-shadow .2s; }.search-shell input::placeholder { color: var(--faint); }.search-shell input:focus { border-color: rgba(200,241,105,.55); box-shadow: 0 0 0 3px rgba(200,241,105,.08); }.search-symbol { position: absolute; z-index: 1; left: 12px; color: var(--faint); font-size: 18px; line-height: 1; }.search-shell kbd { position: absolute; right: 10px; padding: 2px 5px; border: 1px solid var(--line); border-radius: 4px; color: var(--faint); font-size: 10px; }.search-results { display: none; position: absolute; z-index: 30; top: 44px; left: 0; width: 360px; max-width: 80vw; padding: 6px; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }.search-results.is-open { display: grid; gap: 2px; }.search-result { display: grid; gap: 2px; width: 100%; padding: 10px; border: 0; border-radius: 7px; background: transparent; color: var(--text); text-align: left; cursor: pointer; }.search-result:hover, .search-result:focus { background: var(--surface-2); outline: none; }.search-result small { color: var(--lime-dark); font-size: 9px; letter-spacing: .1em; text-transform: uppercase; }.search-result span { overflow: hidden; color: var(--muted); font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }.search-empty { padding: 14px 10px; color: var(--faint); font-size: 12px; }.icon-button { width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--muted); cursor: pointer; }.icon-button:hover { color: var(--lime); border-color: var(--line-strong); }.profile-chip { width: 31px; height: 31px; display: grid; place-items: center; position: relative; border-radius: 50%; background: var(--surface-3); color: var(--lime); font-size: 9px; font-weight: 800; letter-spacing: .02em; }.profile-chip i { position: absolute; right: -1px; bottom: 0; width: 7px; height: 7px; border: 2px solid var(--bg); border-radius: 50%; background: var(--lime); }

.page-wrap { width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 54px 0 28px; }.intro-row { min-height: 248px; display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(310px, .94fr); gap: 42px; align-items: center; }.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--lime); font-size: 10px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }.eyebrow-line { width: 20px; height: 1px; background: var(--lime); }.eyebrow-small { font-size: 9px; letter-spacing: .14em; }.intro-copy h1 { max-width: 600px; margin: 15px 0 12px; font-size: clamp(37px, 4.2vw, 61px); font-weight: 500; letter-spacing: -.064em; line-height: .98; }.intro-copy h1 em { color: var(--lime); font-family: Georgia, serif; font-weight: 400; letter-spacing: -.08em; }.intro-text { max-width: 530px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }.intro-actions { display: flex; gap: 10px; margin-top: 25px; }.button { min-height: 38px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 15px; border: 1px solid transparent; border-radius: 8px; font-size: 11px; font-weight: 750; cursor: pointer; transition: transform .18s, background .18s, border .18s, color .18s; }.button:hover { transform: translateY(-1px); }.button:active { transform: translateY(0); }.button-primary { background: var(--lime); color: #162313; }.button-primary:hover { background: #d5fa7f; }.button-secondary, .button-reveal { border-color: var(--line-strong); background: transparent; color: var(--muted); }.button-secondary:hover, .button-reveal:hover { background: var(--surface-2); color: var(--text); }.button kbd { padding: 2px 5px; border: 1px solid rgba(22,35,19,.25); border-radius: 4px; font-size: 9px; }.play-icon { font-size: 8px; }.intro-actions .button-secondary span { color: var(--lime); font-size: 17px; }
.intro-visual { min-height: 248px; position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 20px; background: radial-gradient(circle at 50% 46%, rgba(200,241,105,.1), transparent 32%), var(--surface); }.visual-grid { position: absolute; inset: 0; opacity: .52; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 28px 28px; mask-image: linear-gradient(to bottom, black, transparent 90%); }.orbit { position: absolute; border: 1px solid rgba(200,241,105,.23); border-radius: 50%; transform: rotate(-18deg); }.orbit-one { width: 280px; height: 120px; left: 67px; top: 72px; }.orbit-two { width: 220px; height: 174px; left: 93px; top: 41px; transform: rotate(62deg); }.orbit-three { width: 160px; height: 206px; left: 123px; top: 25px; transform: rotate(22deg); opacity: .55; }.visual-node { position: absolute; display: flex; align-items: center; gap: 6px; padding: 6px 8px; border: 1px solid var(--line-strong); border-radius: 6px; background: rgba(18,25,24,.86); color: var(--muted); font: 10px/1.1 ui-monospace, SFMono-Regular, Menlo, monospace; }.visual-node i { width: 5px; height: 5px; border-radius: 50%; background: var(--lime); }.node-root { left: 50%; top: 50%; transform: translate(-50%,-50%); border-color: rgba(200,241,105,.52); background: rgba(200,241,105,.11); color: var(--lime); }.node-resource { left: 16%; top: 28%; }.node-memory { right: 9%; top: 28%; }.node-skill { right: 13%; bottom: 22%; }.visual-caption { position: absolute; left: 18px; bottom: 16px; color: var(--faint); font-size: 9px; line-height: 1.5; }.visual-caption b { color: var(--muted); font-weight: 650; }.pulse-dot { display: inline-block; width: 5px; height: 5px; margin-right: 4px; border-radius: 50%; background: var(--orange); }

.metric-row { display: grid; grid-template-columns: 1.35fr repeat(3, 1fr); gap: 10px; margin-top: 46px; }.metric-card { min-height: 100px; display: grid; align-content: center; gap: 4px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }.metric-primary { border-color: rgba(200,241,105,.25); background: linear-gradient(110deg, rgba(200,241,105,.09), transparent 78%), var(--surface); }.metric-label { color: var(--faint); font-size: 10px; letter-spacing: .04em; }.metric-card strong { font-size: 26px; font-weight: 500; letter-spacing: -.04em; }.metric-note { color: var(--muted); font-size: 10px; }.trend-up { margin-right: 3px; color: var(--lime); }.signal-bars { display: inline-flex; align-items: end; gap: 2px; height: 11px; margin-right: 4px; vertical-align: -2px; }.signal-bars i { display: block; width: 3px; border-radius: 2px; background: var(--lime); }.signal-bars i:nth-child(1) { height: 4px; opacity: .45; }.signal-bars i:nth-child(2) { height: 7px; opacity: .65; }.signal-bars i:nth-child(3) { height: 9px; opacity: .8; }.signal-bars i:nth-child(4) { height: 11px; }

.showcase-section { margin-top: 50px; padding: 24px 25px 25px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(135deg, rgba(141,217,222,.055), transparent 47%), var(--surface); }.showcase-heading { margin-bottom: 18px; }.showcase-heading > p { margin: 0 0 1px; color: var(--faint); font-size: 10px; }.showcase-heading > p span { color: var(--lime); font-weight: 800; }.showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; padding: 2px; }.knowledge-tile { min-height: 270px; display: flex; flex-direction: column; padding: 15px; border: 1px solid var(--line); border-radius: 10px; background: rgba(12,17,16,.4); color: var(--text); text-align: left; cursor: pointer; transition: transform .2s ease, background .2s ease, border .2s ease; }.knowledge-tile:hover { transform: translateY(-3px); border-color: rgba(200,241,105,.34); background: var(--surface-2); }.knowledge-tile-top { display: flex; align-items: center; gap: 8px; }.knowledge-index { color: var(--faint); font-size: 9px; font-weight: 800; letter-spacing: .13em; }.showcase-topic { overflow: hidden; color: var(--lime-dark); font-size: 9px; font-weight: 800; text-overflow: ellipsis; white-space: nowrap; }.knowledge-count { margin-left: auto; flex: 0 0 auto; color: var(--faint); font-size: 9px; }.knowledge-tile h3 { display: -webkit-box; overflow: hidden; margin: 15px 0 6px; font-size: 13px; font-weight: 650; letter-spacing: -.02em; line-height: 1.4; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }.knowledge-tile p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.55; }.knowledge-points { display: grid; gap: 5px; margin-top: 11px; }.knowledge-points span { display: grid; grid-template-columns: 9px 1fr; gap: 5px; color: var(--muted); font-size: 10px; line-height: 1.4; }.knowledge-points span::before { content: "·"; color: var(--lime); font-size: 17px; line-height: 12px; }.knowledge-tile-foot { display: flex; justify-content: space-between; gap: 8px; margin-top: auto; padding-top: 12px; color: var(--faint); font-size: 9px; }.knowledge-tile-foot span:last-child { color: var(--orange); }

.content-grid { display: grid; grid-template-columns: minmax(0, 1.58fr) minmax(270px, .78fr); gap: 20px; margin-top: 52px; }.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 17px; }.section-heading h2 { margin: 7px 0 0; font-size: 21px; font-weight: 550; letter-spacing: -.04em; }.deck-status { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 10px; white-space: nowrap; }.heading-divider { width: 1px; height: 12px; background: var(--line-strong); }.flashcard { min-height: 492px; display: flex; flex-direction: column; padding: 23px 25px 19px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: linear-gradient(135deg, rgba(200,241,105,.045), transparent 42%), var(--surface); box-shadow: var(--shadow); }.flashcard-topline, .card-meta, .card-tools, .flashcard-footer { display: flex; align-items: center; justify-content: space-between; }.card-meta { gap: 8px; color: var(--muted); font-size: 10px; }.card-number { color: var(--lime); font-weight: 800; letter-spacing: .12em; }.meta-separator { color: var(--faint); }.card-tools { gap: 11px; }.difficulty-pill { padding: 4px 7px; border-radius: 5px; background: rgba(200,241,105,.11); color: var(--lime); font-size: 9px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }.bookmark-button { width: 26px; height: 26px; padding: 0; border: 1px solid var(--line); border-radius: 6px; background: transparent; color: var(--faint); font-size: 19px; line-height: 1; cursor: pointer; }.bookmark-button:hover, .bookmark-button.is-bookmarked { border-color: rgba(245,156,104,.35); color: var(--orange); }.card-progress { height: 2px; margin: 20px 0 0; border-radius: 2px; background: var(--surface-3); }.card-progress span { display: block; width: 5%; height: 100%; border-radius: inherit; background: var(--lime); transition: width .25s ease; }.question-area { flex: 1; max-width: 700px; padding: 44px 4px 25px; }.question-label { color: var(--orange); font-size: 10px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }.question-area h3 { max-width: 690px; margin: 13px 0 13px; font-size: clamp(25px, 3vw, 38px); font-weight: 470; letter-spacing: -.055em; line-height: 1.1; }.question-hint { margin: 0; color: var(--faint); font-size: 12px; }.answer-area { padding: 21px 20px 18px; border: 1px solid rgba(200,241,105,.18); border-radius: 12px; background: rgba(200,241,105,.055); animation: answer-in .25s ease; }.answer-lead { color: var(--text); font-size: 14px; font-weight: 650; line-height: 1.65; }.answer-points { display: grid; gap: 8px; margin-top: 12px; }.answer-point { display: grid; grid-template-columns: 17px 1fr; gap: 7px; color: var(--muted); font-size: 12px; line-height: 1.55; }.answer-point::before { content: "·"; color: var(--lime); font-size: 20px; line-height: 14px; }.answer-source { display: flex; align-items: center; gap: 8px; margin-top: 16px; padding-top: 11px; border-top: 1px solid var(--line); color: var(--faint); font-size: 10px; }.answer-source a { color: var(--lime-dark); }.answer-source a:hover { text-decoration: underline; }.flashcard-footer { gap: 15px; padding-top: 17px; border-top: 1px solid var(--line); }.keyboard-hint { display: flex; align-items: center; gap: 5px; color: var(--faint); font-size: 10px; }.keyboard-hint kbd, .search-shell kbd { font-family: inherit; }.keyboard-hint kbd { padding: 3px 5px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--muted); font-size: 9px; }.keyboard-hint kbd:nth-of-type(2) { margin-left: 6px; }.card-actions { display: flex; align-items: center; gap: 7px; }.round-button { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--muted); font-size: 17px; cursor: pointer; }.round-button:hover { border-color: var(--line-strong); background: var(--surface-2); color: var(--text); }.button-reveal { min-height: 34px; padding-inline: 11px; }.button-master { min-height: 34px; padding-inline: 11px; border-color: rgba(200,241,105,.3); background: rgba(200,241,105,.12); color: var(--lime); }.button-master:hover, .button-master.is-mastered { background: var(--lime); color: #162313; }.button-master.is-mastered { border-color: var(--lime); }
@keyframes answer-in { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

.right-rail { display: grid; align-content: start; gap: 12px; }.panel { padding: 17px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }.panel-heading { display: flex; align-items: start; justify-content: space-between; gap: 12px; }.panel-kicker { color: var(--faint); font-size: 9px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }.panel h3 { margin: 5px 0 0; font-size: 15px; font-weight: 650; letter-spacing: -.02em; }.panel-icon { color: var(--lime); font-size: 18px; }.rhythm-summary { display: flex; align-items: center; gap: 10px; margin: 21px 0 13px; }.rhythm-summary strong { color: var(--lime); font-size: 31px; font-weight: 500; letter-spacing: -.06em; }.rhythm-summary span { color: var(--muted); font-size: 10px; line-height: 1.45; }.rhythm-summary b { color: var(--faint); font-weight: 500; }.rhythm-chart { padding-top: 12px; border-top: 1px solid var(--line); }.chart-labels { display: flex; justify-content: space-between; color: var(--faint); font-size: 9px; }.chart-bars { height: 52px; display: flex; align-items: end; justify-content: space-around; gap: 5px; padding: 8px 1px 0; }.chart-bars i { width: 100%; height: var(--height); max-width: 20px; display: block; border-radius: 3px 3px 1px 1px; background: rgba(200,241,105,.33); }.chart-bars i:nth-child(2n) { background: rgba(200,241,105,.55); }.chart-bars .bar-today { background: var(--orange); }.chart-bars .bar-empty { background: var(--surface-3); }.pulse-panel .panel-heading { align-items: center; }.topic-list { display: grid; gap: 14px; margin-top: 19px; }.topic-pulse-row { display: grid; grid-template-columns: 1fr 35px; gap: 8px; }.topic-pulse-name { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 5px; color: var(--muted); font-size: 10px; }.topic-pulse-name b { color: var(--faint); font-weight: 500; font-variant-numeric: tabular-nums; }.topic-bar { height: 4px; overflow: hidden; border-radius: 4px; background: var(--surface-3); }.topic-bar span { display: block; height: 100%; border-radius: inherit; background: var(--lime); }.topic-pulse-row:nth-child(2) .topic-bar span { background: var(--blue); }.topic-pulse-row:nth-child(3) .topic-bar span { background: var(--orange); }.topic-pulse-row:nth-child(4) .topic-bar span { background: var(--purple); }.topic-pulse-row > b { align-self: end; color: var(--faint); font-size: 10px; font-weight: 500; text-align: right; }.cue-panel { padding: 19px 18px; border-color: rgba(245,156,104,.18); background: linear-gradient(130deg, rgba(245,156,104,.09), transparent 70%), var(--surface); }.cue-mark { height: 19px; color: var(--orange); font: 34px/20px Georgia, serif; }.cue-panel p { margin: 8px 0 4px; color: var(--muted); font-size: 11px; }.cue-panel strong { display: block; color: var(--text); font-size: 13px; font-weight: 650; line-height: 1.45; }.cue-caption { display: block; margin-top: 13px; color: var(--faint); font-size: 10px; }

.map-section, .reference-section { margin-top: 63px; }.map-heading { align-items: end; }.map-heading > p { margin: 0 0 1px; color: var(--faint); font-size: 11px; }.topic-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }.topic-card { min-height: 145px; display: flex; flex-direction: column; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); cursor: pointer; transition: transform .2s, border .2s, background .2s; }.topic-card:hover { transform: translateY(-3px); border-color: var(--line-strong); background: var(--surface-2); }.topic-card.is-current { border-color: rgba(200,241,105,.46); }.topic-card-top { display: flex; align-items: center; justify-content: space-between; }.topic-index { color: var(--faint); font-size: 10px; font-weight: 800; letter-spacing: .12em; }.topic-icon { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 7px; background: rgba(200,241,105,.11); color: var(--lime); font-size: 14px; }.topic-card:nth-child(2) .topic-icon { background: rgba(141,217,222,.1); color: var(--blue); }.topic-card:nth-child(3) .topic-icon { background: rgba(245,156,104,.1); color: var(--orange); }.topic-card:nth-child(4) .topic-icon { background: rgba(196,173,255,.1); color: var(--purple); }.topic-card:nth-child(5) .topic-icon { background: rgba(200,241,105,.1); color: var(--lime); }.topic-card h3 { margin: 16px 0 4px; font-size: 13px; font-weight: 650; }.topic-card p { min-height: 31px; margin: 0; color: var(--faint); font-size: 10px; line-height: 1.45; }.topic-card-bottom { display: flex; align-items: center; gap: 8px; margin-top: auto; padding-top: 13px; }.topic-card-bottom .topic-bar { flex: 1; }.topic-card-bottom small { color: var(--faint); font-size: 9px; }

.reference-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }.reference-card { min-height: 270px; padding: 21px 22px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }.reference-card-head { display: flex; justify-content: space-between; gap: 12px; }.reference-card h3 { margin: 6px 0 0; font-size: 16px; font-weight: 650; letter-spacing: -.03em; }.reference-index { color: var(--faint); font: 25px/1 Georgia, serif; }.layers-stack { display: grid; gap: 6px; margin-top: 21px; }.layer-row { min-height: 47px; display: grid; grid-template-columns: 30px 1fr auto; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 8px; }.layer-l0 { background: rgba(200,241,105,.09); }.layer-l1 { background: rgba(141,217,222,.09); }.layer-l2 { background: rgba(245,156,104,.09); }.layer-name { font: 14px/1 Georgia, serif; color: var(--lime); }.layer-l1 .layer-name { color: var(--blue); }.layer-l2 .layer-name { color: var(--orange); }.layer-row strong { display: block; font-size: 11px; font-weight: 650; }.layer-row small { color: var(--faint); font-size: 9px; }.layer-action { color: var(--muted); font-size: 9px; }.reference-footnote { margin: 16px 0 0; color: var(--faint); font-size: 10px; line-height: 1.5; }.uri-tree { margin-top: 21px; padding: 15px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-deep); font: 11px/2 ui-monospace, SFMono-Regular, Menlo, monospace; }.tree-symbol { color: var(--lime); }.tree-child { display: flex; gap: 8px; color: var(--muted); }.tree-branch { color: var(--faint); }.tree-child em { margin-left: auto; color: var(--faint); font: 9px/2 ui-sans-serif, system-ui, sans-serif; }.code-callout { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; margin-top: 12px; font: 10px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }.code-callout span { color: var(--orange); }.code-callout code { color: var(--muted); }
.page-footer { display: flex; justify-content: space-between; gap: 16px; margin-top: 55px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--faint); font-size: 10px; }.footer-dot { display: inline-block; width: 5px; height: 5px; margin-left: 4px; border-radius: 50%; background: var(--lime); }
.toast { position: fixed; z-index: 50; right: 24px; bottom: 24px; display: flex; align-items: center; gap: 9px; padding: 10px 13px; border: 1px solid var(--line-strong); border-radius: 9px; background: var(--surface); box-shadow: var(--shadow); color: var(--muted); font-size: 11px; opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity .2s, transform .2s; }.toast.is-visible { opacity: 1; transform: none; }.toast-icon { color: var(--lime); }.mobile-backdrop { display: none; }

@media (max-width: 1080px) { .sidebar { width: 220px; flex-basis: 220px; }.topic-grid { grid-template-columns: repeat(3, 1fr); }.showcase-grid { grid-template-columns: repeat(2, 1fr); }.topic-card:nth-child(4), .topic-card:nth-child(5) { min-height: 125px; }.content-grid { grid-template-columns: minmax(0, 1.4fr) minmax(245px, .8fr); }.card-actions .button { padding-inline: 9px; }.keyboard-hint { display: none; } }
@media (max-width: 820px) { .sidebar { position: fixed; left: 0; top: 0; height: 100vh; transform: translateX(-101%); transition: transform .25s ease; box-shadow: var(--shadow); }.sidebar.is-open { transform: none; }.mobile-backdrop { position: fixed; inset: 0; z-index: 19; display: block; background: rgba(0,0,0,.55); opacity: 0; pointer-events: none; transition: opacity .25s; }.mobile-backdrop.is-visible { opacity: 1; pointer-events: auto; }.menu-button { display: block; }.topbar { padding-inline: 20px; }.content-grid { grid-template-columns: 1fr; }.right-rail { grid-template-columns: 1fr 1fr; }.cue-panel { grid-column: 1 / -1; }.intro-row { grid-template-columns: 1fr; }.intro-visual { min-height: 200px; }.metric-row { grid-template-columns: repeat(2, 1fr); }.metric-card { min-height: 85px; } }
@media (max-width: 580px) { .topbar { height: 62px; padding-inline: 15px; }.topbar-actions { gap: 7px; }.search-shell { width: 38px; }.search-shell input { width: 38px; padding: 0; font-size: 0; border-color: transparent; background: transparent; cursor: pointer; }.search-shell input:focus { width: 220px; position: absolute; right: 0; padding: 0 32px 0 34px; border-color: rgba(200,241,105,.55); background: var(--surface); font-size: 12px; cursor: text; }.search-shell kbd { display: none; }.search-symbol { left: 10px; }.breadcrumb { gap: 6px; font-size: 11px; }.profile-chip { display: none; }.page-wrap { width: min(100% - 30px, 1200px); padding-top: 36px; }.intro-copy h1 { font-size: 39px; }.intro-text { font-size: 13px; }.intro-visual { min-height: 185px; }.orbit-one { left: 30px; }.orbit-two { left: 57px; }.orbit-three { left: 87px; }.node-resource { left: 7%; }.node-memory { right: 4%; }.node-skill { right: 8%; }.metric-row { gap: 7px; margin-top: 32px; }.metric-card { padding: 13px; }.metric-card strong { font-size: 22px; }.showcase-section { margin-top: 32px; padding: 17px 15px; }.showcase-grid { grid-template-columns: 1fr; }.knowledge-tile { min-height: 0; }.content-grid { margin-top: 42px; }.section-heading { align-items: start; flex-direction: column; gap: 9px; }.deck-status { align-self: start; }.flashcard { min-height: 520px; padding: 18px 16px 15px; }.question-area { padding: 38px 2px 21px; }.question-area h3 { font-size: 29px; }.answer-area { padding: 16px; }.flashcard-footer { align-items: end; }.card-actions { flex-wrap: wrap; justify-content: end; }.card-actions .button { order: 1; }.card-actions .round-button { order: 2; }.right-rail { grid-template-columns: 1fr; }.cue-panel { grid-column: auto; }.topic-grid, .reference-grid { grid-template-columns: 1fr; }.topic-card { min-height: 126px; }.map-section, .reference-section { margin-top: 48px; }.map-heading > p { margin: 0; }.reference-card { min-height: 0; padding: 17px; }.tree-child em { font-size: 8px; }.page-footer { flex-direction: column; gap: 5px; margin-top: 40px; }.toast { right: 15px; bottom: 15px; } }

button:focus-visible, a:focus-visible, input:focus-visible { outline: 2px solid var(--lime); outline-offset: 2px; }
[hidden] { display: none !important; }

/* Blog integration: keep the study UI in Sealessland's paper / ink system. */
:root {
  --bg: #edf0f5;
  --bg-deep: #e5e9f1;
  --surface: #f8f9fc;
  --surface-2: #ffffff;
  --surface-3: #e2e6ee;
  --line: #cfd5e1;
  --line-strong: #b8c1d1;
  --text: #171b29;
  --muted: #697185;
  --faint: #8791a4;
  --lime: #a33b70;
  --lime-dark: #70264f;
  --orange: #c96858;
  --blue: #5d78ae;
  --purple: #8064a5;
  --accent-soft: rgba(163, 59, 112, 0.09);
  --on-accent: #fff8fc;
  --shadow: 0 1px 2px rgba(23, 27, 41, 0.06), 0 14px 38px -24px rgba(33, 39, 64, 0.35);
  --radius: .35rem;
  --radius-sm: .25rem;
  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Iowan Old Style", "Noto Serif SC", "Songti SC", Georgia, serif;
  color-scheme: light;
}

body[data-theme="dark"] {
  --bg: #0d1019;
  --bg-deep: #10141f;
  --surface: #151925;
  --surface-2: #1d2231;
  --surface-3: #252b3c;
  --line: #2d3447;
  --line-strong: #424b62;
  --text: #eef0f6;
  --muted: #939bad;
  --faint: #6f7890;
  --lime: #e481b5;
  --lime-dark: #f3acd0;
  --orange: #e29583;
  --blue: #8fa8d9;
  --purple: #bba3e0;
  --accent-soft: rgba(228, 129, 181, 0.12);
  --on-accent: #21101a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 14px 38px -20px rgba(0, 0, 0, .7);
  color-scheme: dark;
}

body { font-family: var(--font-sans); background: var(--bg); color: var(--text); }
h1, h2, h3, .brand-type { font-family: var(--font-serif); }
a { color: var(--lime-dark); }
.brand-mark { border-color: color-mix(in srgb, var(--lime) 48%, transparent); background: var(--accent-soft); }
.brand-mark span { background: var(--lime); }
.nav-item.is-active { background: var(--accent-soft); color: var(--lime); }
.nav-item.is-active .nav-icon, .nav-item.is-active .nav-count { color: var(--lime); }
.status-dot { background: var(--lime); box-shadow: 0 0 0 3px var(--accent-soft); }
.button-primary { background: var(--lime); color: var(--on-accent); }
.button-primary:hover { background: var(--lime-dark); color: var(--on-accent); }
.button kbd { border-color: color-mix(in srgb, var(--lime) 30%, transparent); }
.button-master { border-color: color-mix(in srgb, var(--lime) 34%, transparent); background: var(--accent-soft); color: var(--lime); }
.button-master:hover, .button-master.is-mastered { background: var(--lime); color: var(--on-accent); }
.intro-visual { border-radius: 12px; background: radial-gradient(circle at 50% 46%, var(--accent-soft), transparent 32%), var(--surface); }
.orbit { border-color: color-mix(in srgb, var(--lime) 35%, transparent); }
.visual-node { background: color-mix(in srgb, var(--surface) 90%, transparent); }
.node-root { border-color: color-mix(in srgb, var(--lime) 62%, transparent); background: var(--accent-soft); color: var(--lime); }
.node-root i, .visual-node i { background: var(--lime); }
.metric-primary { border-color: color-mix(in srgb, var(--lime) 30%, var(--line)); background: linear-gradient(110deg, var(--accent-soft), transparent 78%), var(--surface); }
.showcase-section { background: linear-gradient(135deg, var(--accent-soft), transparent 47%), var(--surface); }
.knowledge-tile { border-radius: 7px; background: color-mix(in srgb, var(--surface-2) 62%, transparent); }
.knowledge-tile:hover { border-color: color-mix(in srgb, var(--lime) 48%, var(--line)); background: var(--surface-2); }
.showcase-topic, .knowledge-tile-foot span:last-child { color: var(--lime-dark); }
.knowledge-points span::before { color: var(--lime); }
.flashcard { background: linear-gradient(135deg, var(--accent-soft), transparent 42%), var(--surface); }
.answer-area { border-color: color-mix(in srgb, var(--lime) 24%, var(--line)); background: var(--accent-soft); }
.answer-source a { color: var(--lime-dark); }
.topic-card.is-current { border-color: color-mix(in srgb, var(--lime) 52%, var(--line)); }
.topic-icon { background: var(--accent-soft); color: var(--lime); }
.layer-l0 { background: var(--accent-soft); }
.layer-l1 { background: color-mix(in srgb, var(--blue) 12%, transparent); }
.layer-l2 { background: color-mix(in srgb, var(--orange) 12%, transparent); }
.layer-name { color: var(--lime); }
.tree-symbol { color: var(--lime); }
.footer-dot { background: var(--lime); }
.breadcrumb-back { color: var(--lime-dark); }
.breadcrumb-back:hover { color: var(--lime); }