/* All theme colors are neutral grays; component rules use semantic tokens. */
:root {
  color-scheme: light;
  --bg: #fff; --paper: #fff; --subtle: #f6f6f6; --soft: #eee;
  --raised: #fafafa; --hover: #ededed;
  --ink: #1f1f1f; --muted: #656565; --secondary-ink: #4b4b4b;
  --line: #d9d9d9; --strong-line: #b8b8b8; --divider: #e8e8e8;
  --emphasis: #242424; --emphasis-hover: #414141; --on-emphasis: #fff;
  --emphasis-border: #171717; --focus: #171717;
  --nav-hover: #eaeaea; --nav-active: #e8e8e8;
  --indicator: #737373; --icon-ink: #777; --corner-ink: #757575;
  --marker-line: #8a8a8a; --card-hover-line: #8c8c8c; --option-hover-line: #929292;
  --progress-fill: #555; --progress-track: #e8e8e8; --session-track: #e6e6e6; --score-track: #e2e2e2;
  --selected-surface: #f1f1f1; --correct-surface: #f2f2f2;
  --error-line: #777; --error-ink: #333; --feedback-ink: #444;
  --button-shadow: #00000008; --card-shadow: #0000000d;
  --toast-shadow: #00000026; --dialog-shadow: #00000030; --backdrop: #00000066;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  color: var(--ink); background: var(--bg); font-synthesis: none;
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #101010; --paper: #171717; --subtle: #1c1c1c; --soft: #292929;
  --raised: #1c1c1c; --hover: #292929;
  --ink: #ededed; --muted: #a3a3a3; --secondary-ink: #c7c7c7;
  --line: #383838; --strong-line: #606060; --divider: #303030;
  --emphasis: #ededed; --emphasis-hover: #cfcfcf; --on-emphasis: #171717;
  --emphasis-border: #ededed; --focus: #ededed;
  --nav-hover: #252525; --nav-active: #303030;
  --indicator: #a3a3a3; --icon-ink: #acacac; --corner-ink: #a3a3a3;
  --marker-line: #858585; --card-hover-line: #707070; --option-hover-line: #858585;
  --progress-fill: #b8b8b8; --progress-track: #3a3a3a; --session-track: #333; --score-track: #414141;
  --selected-surface: #292929; --correct-surface: #252525;
  --error-line: #999; --error-ink: #d2d2d2; --feedback-ink: #c7c7c7;
  --button-shadow: #00000033; --card-shadow: #00000040;
  --toast-shadow: #00000066; --dialog-shadow: #00000080; --backdrop: #000000a6;
}
* { box-sizing: border-box; }
body { margin: 0; font-size: 14px; line-height: 1.5; }
button, input, select { font: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
button, a { touch-action: manipulation; }
button { cursor: pointer; transition: background .15s, border-color .15s, box-shadow .15s; }
button:disabled { cursor: not-allowed; opacity: .45; }
a { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: 27px; font-weight: 650; letter-spacing: -.8px; line-height: 1.3; }
h2 { font-size: 18px; font-weight: 600; letter-spacing: -.3px; }
h3 { font-size: 15px; font-weight: 600; }
svg { width: 20px; height: 20px; flex-shrink: 0; vertical-align: middle; fill: none; stroke: currentColor; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; }
.skip { position: fixed; top: -60px; z-index: 100; background: var(--paper); padding: 12px; }
.skip:focus { top: 8px; }
.loading { padding: 80px 20px; text-align: center; color: var(--muted); }
.layout { display: grid; grid-template-columns: 224px minmax(0, 1fr); min-height: 100vh; }
.sidebar { background: var(--subtle); border-right: 1px solid var(--line); position: sticky; top: 0; height: 100vh; padding: 25px 14px 20px; display: flex; flex-direction: column; }
.brand { display: flex; gap: 10px; align-items: center; padding: 0 8px; color: var(--ink); text-decoration: none; }
.brand img { width: 33px; height: 33px; }
.brand strong { font-size: 16px; font-weight: 650; letter-spacing: -.4px; display: block; line-height: 1.45; }
.brand small { font-size: 10px; color: var(--muted); }
.course-switch { margin: 28px 4px 25px; padding: 12px; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; }
.course-switch small { font-size: 10px; letter-spacing: .7px; color: var(--muted); display: block; }
.course-switch strong { font-size: 12px; font-weight: 600; display: flex; justify-content: space-between; gap: 6px; margin-top: 6px; }
.course-switch strong span { color: var(--muted); font: 10px/18px var(--mono); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.nav-label { padding: 0 12px; margin-bottom: 8px; color: var(--muted); font-size: 10px; font-weight: 600; letter-spacing: .9px; }
.nav { display: grid; gap: 4px; }
.nav button { position: relative; display: flex; gap: 10px; align-items: center; border: 1px solid transparent; background: transparent; text-align: left; padding: 10px 12px; border-radius: 6px; color: var(--secondary-ink); font-size: 13px; min-height: 44px; }
.nav button:hover { background: var(--nav-hover); }
.nav button.active { background: var(--nav-active); color: var(--emphasis-border); font-weight: 600; }
.nav button.active:before { content: ''; position: absolute; width: 3px; border-radius: 2px; background: var(--emphasis-border); left: -7px; top: 10px; bottom: 10px; }
.nav button svg { width: 17px; height: 17px; }
.sidebar-bottom { margin-top: auto; padding-top: 24px; }
.local-note { margin: 17px 10px 0; border-top: 1px solid var(--line); padding-top: 17px; display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 10px; }
.local-note i { height: 6px; width: 6px; background: var(--indicator); border-radius: 50%; }
.workspace { min-width: 0; }
.topbar { height: 66px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 0 36px; background: var(--subtle); color: var(--muted); font-size: 12px; }
.breadcrumb { display: flex; align-items: center; gap: 10px; min-width: 0; overflow: hidden; white-space: nowrap; }
.breadcrumb svg { width: 13px; }
.breadcrumb span { color: var(--ink); font-weight: 500; overflow: hidden; text-overflow: ellipsis; }
.topbar-right { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.course-chip { border: 1px solid var(--line); border-radius: 5px; padding: 4px 9px; font: 10px/1.5 var(--mono); background: var(--paper); }
.theme-toggle { min-height: 44px; min-width: 84px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 8px 11px; background: var(--paper); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; font-size: 12px; font-weight: 500; white-space: nowrap; flex-shrink: 0; }
.theme-toggle:hover { background: var(--hover); border-color: var(--strong-line); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-icon-dark, .theme-label-dark { display: none; }
:root[data-theme='dark'] .theme-icon-light, :root[data-theme='dark'] .theme-label-light { display: none; }
:root[data-theme='dark'] .theme-icon-dark { display: inline-block; }
:root[data-theme='dark'] .theme-label-dark { display: inline; }
main { max-width: 1380px; margin: auto; padding: 30px 36px 24px; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 24px; }
.eyebrow { font: 500 10px/1.5 var(--mono); letter-spacing: 1px; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.sub { color: var(--muted); font-size: 13px; margin-top: 6px; }
.pill { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); border-radius: 20px; padding: 4px 10px; font-size: 11px; background: var(--paper); white-space: nowrap; }
.pill svg { width: 13px; height: 13px; }
.pill.green { background: var(--subtle); color: var(--ink); }
.hero { background: var(--raised); border: 1px solid var(--line); border-radius: var(--radius); padding: 27px 28px; display: grid; grid-template-columns: minmax(0, 1fr) 156px; gap: 24px; margin-bottom: 20px; }
.hero .eyebrow { font-size: 10px; }
.hero h2 { font-size: clamp(22px, 2.15vw, 29px); letter-spacing: -.8px; font-weight: 600; line-height: 1.25; max-width: 600px; }
.hero p { color: var(--muted); font-size: 13px; margin: 10px 0 19px; max-width: 550px; }
.hero-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.hero-summary { border-left: 1px solid var(--line); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding-left: 24px; }
.hero-summary strong { display: block; font: 500 49px/1.1 var(--mono); letter-spacing: -3px; }
.hero-summary span { display: block; font-size: 12px; margin-top: 7px; }
.hero-summary small { display: block; max-width: 130px; font: 10px/1.6 var(--mono); color: var(--muted); margin-top: 14px; }
.button { border: 1px solid var(--emphasis-border); border-radius: 6px; padding: 9px 15px; min-height: 42px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-size: 12px; line-height: 1.4; font-weight: 600; text-decoration: none; background: var(--emphasis); color: var(--on-emphasis); box-shadow: 0 1px 0 var(--button-shadow); }
.button svg { width: 16px; height: 16px; }
.button:hover { background: var(--emphasis-hover); }
.button.lime { background: var(--emphasis); color: var(--on-emphasis); }
.button.lime:hover { background: var(--emphasis-hover); }
.button.ghost, .button.secondary { background: var(--paper); border-color: var(--line); color: var(--ink); }
.button.ghost:hover, .button.secondary:hover { background: var(--hover); border-color: var(--strong-line); }
.button.danger { background: var(--paper); border-color: var(--indicator); color: var(--emphasis-border); }
.button.danger:hover { background: var(--emphasis-border); color: var(--on-emphasis); }
.button.small { padding: 8px 11px; font-size: 11px; min-height: 40px; }
.button.text { background: transparent; border: 0; color: var(--ink); padding: 5px 0; min-height: 38px; box-shadow: none; }
.button.text:hover { text-decoration: underline; text-underline-offset: 4px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-bottom: 28px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.stat { background: var(--paper); border-right: 1px solid var(--line); padding: 18px 21px; }
.stat:last-child { border-right: 0; }
.stat-top { font-size: 12px; color: var(--muted); display: flex; align-items: center; justify-content: space-between; gap: 7px; }
.stat-top svg { width: 15px; height: 15px; color: var(--icon-ink); }
.stat-number { font-size: 29px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -1px; line-height: 1.25; margin: 9px 0 4px; }
.stat-number small { font-size: 13px; color: var(--muted); font-weight: 400; letter-spacing: 0; }
.stat-caption { font-size: 11px; color: var(--muted); }
.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 24px; }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin: 0 0 13px; }
.section-title h2 { font-size: 16px; }
.section-title span { font-size: 11px; color: var(--muted); }
.mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.mode-card { color: var(--ink); text-align: left; background: var(--paper); border: 1px solid var(--line); border-radius: 7px; padding: 19px; position: relative; display: flex; flex-direction: column; align-items: start; min-height: 180px; }
.mode-card:hover { background: var(--raised); border-color: var(--card-hover-line); box-shadow: 0 1px 3px var(--card-shadow); }
.mode-icon { width: 33px; height: 33px; border: 1px solid var(--line); border-radius: 6px; background: var(--subtle); color: var(--ink); display: grid; place-items: center; margin-bottom: 14px; }
.mode-icon svg { width: 18px; height: 18px; }
.mode-card h3 { font-size: 14px; margin-bottom: 6px; }
.mode-card p { color: var(--muted); font-size: 12px; line-height: 1.6; max-width: 310px; }
.mode-card .corner { position: absolute; right: 17px; top: 23px; width: 16px; color: var(--corner-ink); }
.mode-foot { font: 10px/1.5 var(--mono); color: var(--muted); margin-top: auto; padding-top: 17px; }
.exam-card { background: var(--subtle); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.exam-card .eyebrow { font-size: 9px; letter-spacing: .8px; }
.exam-card h2 { font-size: 21px; line-height: 1.3; font-weight: 600; margin: 12px 0; }
.exam-card > p { font-size: 12px; color: var(--muted); line-height: 1.7; }
.exam-facts { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 17px 0; margin: 21px 0; }
.exam-facts strong { font: 500 23px/1.2 var(--mono); display: block; letter-spacing: -.8px; }
.exam-facts small { display: block; font-size: 10px; color: var(--muted); margin-top: 6px; }
.exam-card .button { width: 100%; }
.exam-card .under { font-size: 10px; color: var(--muted); text-align: center; margin-top: 11px; }
.tip { padding: 20px 2px; display: flex; gap: 10px; }
.tip > svg { color: var(--muted); width: 17px; margin-top: 2px; }
.tip h3 { font-size: 12px; margin-bottom: 5px; }
.tip p { font-size: 12px; color: var(--muted); line-height: 1.7; }
.topic-panel { margin-top: 26px; }
.topic-list { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.topic-row { display: grid; grid-template-columns: minmax(0, 1fr) 90px 42px; gap: 16px; padding: 13px 17px; align-items: center; border-bottom: 1px solid var(--divider); font-size: 12px; }
.topic-row:last-child { border: 0; }
.topic-row .topic-name { display: flex; gap: 9px; align-items: center; }
.topic-row .topic-name i { width: 6px; height: 6px; border: 1px solid var(--marker-line); border-radius: 50%; flex-shrink: 0; }
.topic-row small { color: var(--muted); text-align: right; font: 10px var(--mono); }
.bar { height: 5px; border-radius: 2px; background: var(--progress-track); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--progress-fill); border-radius: 2px; }
.page-footer { margin-top: 32px; border-top: 1px solid var(--line); padding-top: 17px; display: flex; justify-content: space-between; gap: 18px; color: var(--muted); font-size: 10px; }
.page-footer a { text-underline-offset: 3px; }
.panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 25px; }
.setup-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: start; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 21px; margin: 24px 0; }
.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field label { font-weight: 600; font-size: 12px; }
.field small, .help { font-size: 12px; color: var(--muted); }
input, select { width: 100%; background: var(--paper); color: var(--ink); border: 1px solid var(--strong-line); border-radius: 6px; padding: 10px 11px; min-height: 42px; font-size: 13px; }
input:disabled, select:disabled { background: var(--subtle); color: var(--muted); opacity: 1; }
input::placeholder { color: var(--icon-ink); }
input[type='search'] { appearance: none; }
select { padding-right: 28px; }
.check-label { display: flex; align-items: center; gap: 9px; font-size: 12px; }
.check-label input { width: 17px; height: 17px; min-height: 0; accent-color: var(--emphasis); }
.start-row { display: flex; justify-content: space-between; align-items: center; gap: 15px; padding-top: 20px; border-top: 1px solid var(--line); }
.start-row small { font-size: 11px; color: var(--muted); }
.info-list { padding-left: 18px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.info-list li { margin: 11px 0; }
.notice { padding: 13px 16px; border-radius: 6px; background: var(--subtle); color: var(--secondary-ink); font-size: 12px; margin-bottom: 20px; border: 1px solid var(--line); }
.notice.warn { border-left: 3px solid var(--emphasis-border); color: var(--emphasis-border); }
.resume { display: flex; justify-content: space-between; align-items: center; gap: 15px; }
.session-head { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 22px; }
.session-meta { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.timer { font: 500 18px/1.5 var(--mono); padding: 7px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); display: inline-flex; align-items: center; gap: 8px; }
.timer.urgent { color: var(--on-emphasis); background: var(--emphasis-border); border-color: var(--emphasis-border); }
.question-layout { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 22px; align-items: start; }
.question-panel { padding: 27px 30px; }
.question-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 11px; color: var(--muted); margin-bottom: 22px; }
.question-meta .pill { font-size: 11px; white-space: normal; }
.icon-button { width: 42px; height: 42px; min-width: 42px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--muted); display: inline-grid; place-items: center; }
.icon-button:hover { background: var(--subtle); border-color: var(--strong-line); }
.icon-button.selected { background: var(--emphasis); color: var(--on-emphasis); border-color: var(--emphasis); }
.icon-button.selected svg { fill: var(--emphasis); }
.question-text { font-size: 20px; line-height: 1.65; font-weight: 500; letter-spacing: -.25px; white-space: pre-line; overflow-wrap: anywhere; }
.answer-hint { font-size: 12px; color: var(--muted); margin: 14px 0 21px; display: flex; gap: 7px; align-items: center; }
.answer-hint svg { width: 14px; }
.options { display: grid; gap: 10px; }
.option { display: flex; gap: 12px; align-items: start; padding: 14px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); cursor: pointer; position: relative; transition: background .15s, border-color .15s; }
.option:hover { background: var(--raised); border-color: var(--option-hover-line); }
.option.selected { background: var(--selected-surface); border-color: var(--emphasis); box-shadow: inset 0 0 0 1px var(--emphasis); }
.option.correct { background: var(--correct-surface); border: 1px solid var(--emphasis); box-shadow: inset 3px 0 var(--emphasis); }
.option.wrong { background: var(--paper); border: 1px dashed var(--error-line); }
.option input { position: absolute; opacity: 0; width: 1px; height: 1px; min-height: 0; pointer-events: none; }
.option:focus-within { outline: 2px solid var(--focus); outline-offset: 3px; }
.option-letter { width: 28px; height: 28px; flex-shrink: 0; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 5px; font: 11px var(--mono); background: var(--paper); color: var(--muted); }
.option.selected .option-letter, .option.correct .option-letter { background: var(--emphasis); color: var(--on-emphasis); border-color: var(--emphasis); }
.option.wrong .option-letter { background: var(--paper); color: var(--error-ink); border: 1px dashed var(--error-line); }
.option-text { font-size: 14px; line-height: 1.7; padding-top: 2px; white-space: pre-line; overflow-wrap: anywhere; flex: 1; min-width: 0; }
.option > svg { width: 17px; margin-top: 5px; }
.option-state { display: inline-flex; align-items: center; gap: 5px; font-size: 10px; font-weight: 600; color: var(--feedback-ink); padding-top: 6px; white-space: nowrap; }
.option-state svg { width: 14px; height: 14px; }
.question-actions { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-top: 25px; padding-top: 21px; border-top: 1px solid var(--line); }
.question-actions > div { display: flex; gap: 8px; }
.feedback { background: var(--subtle); border: 1px solid var(--line); border-left: 3px solid var(--emphasis); padding: 17px 19px; border-radius: 6px; margin-top: 22px; }
.feedback.wrong { background: var(--paper); border-style: dashed; border-left-style: solid; }
.feedback h3 { font-size: 14px; margin-bottom: 7px; }
.feedback p { font-size: 13px; color: var(--feedback-ink); white-space: pre-line; overflow-wrap: anywhere; }
.feedback small { display: block; color: var(--muted); font-size: 11px; margin-top: 9px; }
.navigator { padding: 18px; }
.navigator h3 { font-size: 13px; }
.navigator > p { font-size: 11px; color: var(--muted); margin: 6px 0 14px; }
.number-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; max-height: 350px; overflow: auto; padding: 3px; }
.number-grid button { height: 34px; min-width: 0; border: 1px solid var(--line); border-radius: 5px; font: 10px var(--mono); color: var(--muted); background: var(--paper); position: relative; }
.number-grid button:hover { border-color: var(--icon-ink); }
.number-grid button.answered { background: var(--emphasis); border-color: var(--emphasis); color: var(--on-emphasis); }
.number-grid button.active { outline: 2px solid var(--focus); outline-offset: 1px; font-weight: 700; }
.number-grid button.flagged:after { content: ''; width: 6px; height: 6px; background: var(--paper); border: 1px solid var(--emphasis-border); transform: rotate(45deg); position: absolute; top: -2px; right: -1px; }
.nav-legend { display: flex; gap: 12px; flex-wrap: wrap; margin: 16px 0; font-size: 10px; color: var(--muted); }
.nav-legend span { display: flex; align-items: center; gap: 6px; }
.nav-legend i { width: 8px; height: 8px; border-radius: 2px; background: var(--emphasis); }
.nav-legend i.gold { background: var(--paper); border: 1px solid var(--emphasis); transform: rotate(45deg); border-radius: 0; }
.navigator .button { width: 100%; margin-top: 7px; }
.card-reveal { margin: 25px auto 0; display: flex; }
.flash-answer { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 22px; }
.flash-answer h3 { font: 11px/1.5 var(--mono); margin-bottom: 12px; }
.flash-answer p { margin: 10px 0; font-size: 14px; }
.flash-actions { display: flex; gap: 12px; justify-content: center; margin-top: 25px; }
.result-hero { text-align: center; padding: 32px; border-radius: var(--radius); background: var(--raised); border: 1px solid var(--line); margin-bottom: 24px; }
.result-hero.fail { border-style: dashed; }
.score-ring { --score: 0%; background: conic-gradient(var(--emphasis) var(--score), var(--score-track) 0); width: 130px; height: 130px; border-radius: 50%; padding: 7px; margin: 0 auto 19px; }
.score-ring > div { height: 100%; border-radius: 50%; background: var(--raised); display: flex; flex-direction: column; align-items: center; justify-content: center; }
.score-ring strong { font: 500 29px/1.5 var(--mono); letter-spacing: -1px; }
.score-ring small { font-size: 10px; color: var(--muted); }
.result-hero h1 { font-size: 26px; }
.result-hero > p { color: var(--muted); font-size: 12px; margin: 11px 0 20px; }
.result-hero .hero-buttons { justify-content: center; }
.result-metrics { display: flex; justify-content: center; gap: 40px; margin: 23px auto; }
.result-metrics strong { font: 500 23px/1.4 var(--mono); display: block; }
.result-metrics small { font-size: 11px; color: var(--muted); }
.toolbar { display: flex; gap: 10px; margin: 20px 0; flex-wrap: wrap; }
.toolbar input { flex: 1; min-width: 200px; }
.toolbar select { width: auto; max-width: 250px; }
.count-label { font-size: 12px; color: var(--muted); margin: 10px 0 17px; }
.bank-list { display: grid; gap: 10px; }
.bank-item { background: var(--paper); border: 1px solid var(--line); border-radius: 7px; padding: 18px 20px; }
.bank-item summary { cursor: pointer; list-style: none; display: flex; gap: 13px; align-items: start; font-size: 14px; line-height: 1.7; }
.bank-item summary::-webkit-details-marker { display: none; }
.bank-item summary:after { content: '+'; font-size: 19px; margin-left: auto; color: var(--muted); }
.bank-item[open] summary:after { content: '−'; }
.bank-id { color: var(--muted); font: 11px/1.7 var(--mono); background: var(--subtle); border: 1px solid var(--line); border-radius: 4px; padding: 2px 6px; white-space: nowrap; margin-top: 2px; }
.bank-body { padding-top: 18px; margin-top: 18px; border-top: 1px solid var(--line); }
.bank-body .option { cursor: default; margin-top: 0; }
.bank-bottom { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 17px; }
.bank-bottom small { font-size: 11px; color: var(--muted); }
.status-label { font-size: 10px; font-weight: 600; color: var(--emphasis); white-space: nowrap; padding: 2px 7px; border: 1px solid var(--line); border-radius: 4px; margin-top: 2px; }
.status-label.wrong { border-style: dashed; }
.empty { text-align: center; padding: 42px 25px; background: var(--raised); border: 1px dashed var(--strong-line); border-radius: var(--radius); }
.empty svg { width: 30px; height: 30px; color: var(--muted); margin-bottom: 10px; }
.empty h3 { font-size: 15px; }
.empty p { font-size: 12px; color: var(--muted); margin: 8px 0 18px; }
.history-list { display: grid; gap: 9px; }
.history-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 13px 16px; border: 1px solid var(--line); background: var(--paper); border-radius: 6px; font-size: 12px; }
.history-row small { color: var(--muted); font-size: 11px; }
.settings-grid { display: grid; gap: 20px; max-width: 850px; }
.settings-grid .panel > p { font-size: 13px; color: var(--muted); margin: 12px 0 19px; line-height: 1.8; }
.settings-grid .panel .hero-buttons { margin-top: 15px; }
.settings-grid h2 { font-size: 17px; }
.history-section { margin-top: 28px; }
#toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(150px); z-index: 100; background: var(--emphasis); color: var(--on-emphasis); padding: 12px 19px; border-radius: 7px; box-shadow: 0 5px 24px var(--toast-shadow); font-size: 13px; max-width: calc(100% - 30px); transition: transform .2s; pointer-events: none; }
#toast.visible { transform: translateX(-50%) translateY(0); }
dialog { border: 1px solid var(--line); border-radius: 9px; padding: 26px; width: 440px; max-width: calc(100% - 30px); color: var(--ink); background: var(--paper); box-shadow: 0 16px 70px var(--dialog-shadow); }
dialog::backdrop { background: var(--backdrop); }
dialog h2 { font-size: 20px; }
dialog p { font-size: 13px; color: var(--muted); margin: 15px 0 24px; line-height: 1.7; }
dialog .hero-buttons { justify-content: flex-end; }
.session-progress { height: 3px; background: var(--session-track); border-radius: 2px; margin: -10px 0 23px; overflow: hidden; }
.session-progress > i { display: block; height: 100%; background: var(--emphasis); }
.full-width { width: 100%; }
.source-note { font-size: 11px; color: var(--muted); margin-top: 18px; line-height: 1.8; }
.mobile-brand { display: none; }
.inline-link { font-size: 12px; color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.error-page { max-width: 650px; margin: 70px auto; padding: 32px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.error-page p { margin: 15px 0; }
.link-row { display: flex; gap: 18px; flex-wrap: wrap; margin: 16px 0; }
.list-footer { text-align: center; margin: 22px 0; }
@media (min-width: 1550px) {
  main { padding-top: 38px; }
  .dashboard-grid { grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; }
  .hero { padding: 30px; }
}
@media (max-width: 1200px) {
  .layout { grid-template-columns: 204px minmax(0, 1fr); }
  .sidebar { padding-left: 12px; padding-right: 12px; }
  main { padding: 27px; }
  .topbar { padding: 0 27px; }
  .dashboard-grid { grid-template-columns: minmax(0, 1fr) 250px; gap: 18px; }
  .stat { padding: 16px; }
  .hero { grid-template-columns: minmax(0, 1fr) 125px; padding: 24px; }
  .setup-layout { grid-template-columns: minmax(0, 1fr) 265px; gap: 18px; }
  .question-layout { grid-template-columns: minmax(0, 1fr) 230px; gap: 18px; }
  .question-panel { padding: 24px; }
  .topic-row { grid-template-columns: minmax(0, 1fr) 65px 36px; gap: 10px; }
}
@media (max-width: 1050px) {
  .dashboard-grid, .setup-layout, .question-layout { grid-template-columns: 1fr; }
  .dashboard-aside { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .tip { align-items: start; padding-top: 10px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .navigator { order: 2; }
  .number-grid { grid-template-columns: repeat(10, 1fr); max-height: 200px; }
  .number-grid button { height: 40px; }
  .info-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; }
}
@media (max-width: 760px) {
  .layout { display: block; }
  .sidebar { position: relative; height: auto; padding: 16px 18px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .brand { padding: 0 3px; }
  .brand img { width: 30px; height: 30px; }
  .brand strong { font-size: 15px; }
  .course-switch, .nav-label, .local-note { display: none; }
  .nav { display: flex; overflow-x: auto; gap: 3px; padding: 13px 0 11px; }
  .nav button { flex-shrink: 0; padding: 10px 11px; font-size: 12px; gap: 7px; }
  .nav button svg { width: 15px; height: 15px; }
  .nav button.active:before { display: none; }
  .sidebar > .nav { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); overflow: visible; }
  .sidebar > .nav button { flex-direction: column; font-size: 10px; padding: 8px 2px; white-space: nowrap; min-height: 54px; gap: 5px; }
  .sidebar-bottom { position: absolute; right: 18px; top: 13px; margin: 0; padding: 0; }
  .sidebar-bottom .nav { padding: 0; }
  .sidebar-bottom .nav button { font-size: 0; padding: 10px; gap: 0; }
  .sidebar-bottom .nav button svg { width: 19px; height: 19px; }
  .topbar { height: 45px; padding: 0 22px; font-size: 11px; }
  .topbar-right .course-chip { display: none; }
  main { padding: 24px 22px; }
  h1 { font-size: 25px; }
  .page-head { margin-bottom: 21px; }
  .page-head > .pill { display: none; }
  .hero { grid-template-columns: 1fr; padding: 23px; }
  .hero-summary { display: none; }
  .hero h2 { font-size: 25px; }
  .hero p { font-size: 13px; }
  .hero .desktop-break { display: none; }
  .button, input, select { min-height: 44px; }
  input, select { font-size: 16px; }
  .hero-buttons .button { font-size: 12px; padding: 10px 13px; }
  .stat-number { font-size: 27px; }
  .stat-caption { font-size: 10px; }
  .dashboard-aside { grid-template-columns: 1fr; gap: 14px; }
  .mode-card { padding: 18px; }
  .mode-card .corner { right: 14px; }
  .topic-row { padding: 13px; font-size: 11px; grid-template-columns: minmax(0, 1fr) 60px 34px; gap: 10px; }
  .page-footer { font-size: 10px; flex-direction: column; gap: 8px; }
  .question-panel { padding: 21px; }
  .question-text { font-size: 18px; }
  .question-meta { margin-bottom: 18px; }
  .question-actions { flex-wrap: wrap; }
  .question-actions .button { font-size: 12px; padding: 10px 12px; }
  .session-head { align-items: start; }
  .session-head > .button { font-size: 11px; padding: 8px 10px; }
  .timer { font-size: 16px; }
  .number-grid { grid-template-columns: repeat(8, 1fr); }
  .number-grid button { height: 44px; }
  .panel { padding: 22px; }
  .fields { gap: 17px; }
  .info-list { display: block; }
  .toolbar select { width: 100%; max-width: none; }
  .toolbar input { width: 100%; flex: auto; }
  .bank-item { padding: 16px; }
  .bank-item summary { gap: 10px; font-size: 13px; flex-wrap: wrap; }
  .bank-item summary > [lang] { flex: 1; min-width: 65%; }
  .bank-bottom { align-items: start; }
  .result-metrics { gap: 27px; }
  .result-hero { padding: 28px 15px; }
  .result-hero h1 { font-size: 24px; }
  .resume { align-items: start; flex-direction: column; }
  .section-title:has(select) { align-items: start; flex-direction: column; }
  .option { flex-wrap: wrap; }
  .option-state { width: 100%; padding: 0 0 0 40px; }
}
@media (max-width: 440px) {
  main { padding: 22px 16px; }
  .topbar { padding: 0 17px; }
  .sidebar { padding-left: 12px; padding-right: 12px; }
  .nav button { padding: 10px; }
  .mode-grid { grid-template-columns: 1fr; gap: 10px; }
  .mode-card { min-height: 0; padding: 17px 18px 17px 64px; }
  .mode-icon { margin-bottom: 12px; }
  .mode-card .mode-icon { position: absolute; top: 18px; left: 18px; width: 31px; height: 31px; }
  .mode-card h3 { padding-right: 21px; }
  .mode-card .corner { top: 22px; width: 14px; }
  .mode-foot { padding-top: 11px; }
  .stat { padding: 14px; }
  .stat-top { font-size: 11px; }
  .fields { grid-template-columns: 1fr; }
  .field.wide { grid-column: auto; }
  .start-row { align-items: start; flex-direction: column; }
  .start-row .button { width: 100%; }
  .option { gap: 10px; padding: 12px; }
  .option-text { font-size: 13px; }
  .option-state { padding-left: 38px; }
  .question-panel { padding: 19px; }
  .question-actions > div { width: 100%; }
  .question-actions > div > .button { flex: 1; }
  .flash-actions { flex-direction: column; }
  .number-grid { grid-template-columns: repeat(5, 1fr); }
  .result-metrics { gap: 21px; }
  .result-metrics strong { font-size: 21px; }
  .topic-row { grid-template-columns: minmax(0, 1fr) 46px 34px; gap: 8px; }
}
@media (max-width: 350px) {
  .sidebar > .nav button { font-size: 9px; letter-spacing: -.15px; padding-inline: 0; min-width: 0; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}