:root {
  --navy: #102f3b;
  --navy-2: #1d4a58;
  --ink: #17333c;
  --muted: #60757a;
  --paper: #f4f1e8;
  --card: #fffdf8;
  --line: #d8d7ce;
  --cyan: #79d1d5;
  --cyan-soft: #dff5f3;
  --yellow: #f4c95d;
  --yellow-soft: #fff2c8;
  --coral: #ed765e;
  --coral-soft: #ffe1d8;
  --green: #2c8b72;
  --shadow: 0 18px 50px rgba(16, 47, 59, .11);
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 8% 5%, #fff 0, transparent 24%), var(--paper); }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.shell { width: min(1220px, calc(100% - 36px)); margin-inline: auto; }

.topbar {
  position: sticky; top: 0; z-index: 20; height: 72px; display: flex; align-items: center; justify-content: space-between;
  padding-inline: max(18px, calc((100vw - 1220px) / 2)); background: rgba(244, 241, 232, .92);
  border-bottom: 1px solid rgba(16, 47, 59, .14); backdrop-filter: blur(14px);
}
.brand { display: flex; gap: 11px; align-items: center; color: var(--navy); text-decoration: none; }
.brand > span:last-child { display: grid; line-height: 1.05; }
.brand b { font-size: 17px; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .1em; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--navy); color: var(--yellow); font: italic 700 24px Georgia, serif; }
.top-actions { display: flex; align-items: center; gap: 16px; }
.edition-badge { padding: 7px 11px; border: 1px solid var(--navy); border-radius: 999px; font: 700 11px ui-monospace, monospace; }
.quiet-link { color: var(--navy); font-size: 13px; font-weight: 750; text-underline-offset: 4px; }

.hero { min-height: 410px; display: grid; grid-template-columns: 1.45fr .65fr; gap: 60px; align-items: center; padding-block: 66px 46px; }
.eyebrow { margin: 0 0 12px; color: var(--green); font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .14em; }
h1 { max-width: 850px; margin: 0 0 24px; font: 500 clamp(46px, 6vw, 76px)/1.02 Georgia, "Times New Roman", serif; letter-spacing: -.035em; }
h1 em { color: var(--coral); font-weight: inherit; }
.hero-copy { max-width: 780px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.7; }
.orbit-card { position: relative; min-height: 270px; }
.orbit { position: absolute; left: 50%; top: 50%; border: 1px solid rgba(16,47,59,.25); border-radius: 50%; transform: translate(-50%,-50%) rotate(-20deg); }
.orbit-one { width: 260px; height: 115px; }
.orbit-two { width: 210px; height: 210px; transform: translate(-50%,-50%) rotate(30deg); }
.nucleus { position: absolute; left: 50%; top: 50%; width: 82px; height: 82px; display: grid; place-items: center; transform: translate(-50%,-50%); border-radius: 50%; background: var(--navy); color: white; font: 700 16px ui-monospace, monospace; box-shadow: 0 0 0 12px var(--cyan-soft); }
.particle { position: absolute; padding: 7px 10px; border-radius: 999px; color: var(--navy); background: var(--yellow); font-size: 11px; font-weight: 850; box-shadow: var(--shadow); }
.p1 { top: 27px; left: 20px; }.p2 { right: 0; top: 110px; }.p3 { left: 25px; bottom: 20px; background: var(--cyan); }

.loading-card, .panel { border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.loading-card { padding: 36px; text-align: center; }
.panel { padding: clamp(22px, 4vw, 42px); }
.panel + .panel { margin-top: 20px; }
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 26px; }
.panel-head h2, .panel h2 { margin: 0 0 9px; font: 500 clamp(28px, 3.5vw, 42px)/1.08 Georgia, serif; letter-spacing: -.02em; }
.panel-head p, .muted { margin: 0; color: var(--muted); line-height: 1.58; }
.step-chip { flex: 0 0 auto; padding: 7px 11px; border-radius: 999px; color: #185b5d; background: var(--cyan-soft); font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .08em; }

.onboarding { max-width: 900px; margin-inline: auto; }
.field-grid { display: grid; grid-template-columns: 1.2fr 1fr .8fr; gap: 13px; margin: 24px 0; }
.field { display: grid; gap: 7px; color: var(--muted); font-size: 12px; font-weight: 800; }
input:not([type=radio]):not([type=checkbox]), textarea, select { width: 100%; padding: 12px 13px; border: 1px solid #b9bbb4; border-radius: 0; outline: none; color: var(--ink); background: white; }
input[type=radio], input[type=checkbox] { width: auto; flex: none; margin: 0; padding: 0; border: 0; }
input:focus, textarea:focus, select:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(44,139,114,.13); }
textarea { min-height: 92px; line-height: 1.5; resize: vertical; }
.level-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0 24px; }
.level-card { position: relative; display: grid; gap: 5px; padding: 17px; border: 1px solid var(--line); background: white; cursor: pointer; }
.level-card input { position: absolute; opacity: 0; }
.level-card:has(input:checked) { border: 2px solid var(--green); padding: 16px; background: var(--cyan-soft); }
.level-card strong { font-size: 14px; }.level-card small { color: var(--muted); line-height: 1.4; }

.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 17px; border: 1px solid var(--navy); color: white; background: var(--navy); font-weight: 800; text-decoration: none; }
.button:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(16,47,59,.15); }
.button-secondary { color: var(--navy); background: transparent; }
.button-coral { border-color: #bd4e3b; background: var(--coral); }
.button-small { min-height: 34px; padding: 6px 10px; font-size: 12px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-top: 18px; }

.dashboard-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.dashboard-intro h2 { margin: 0; font: 500 38px/1.1 Georgia, serif; }
.exam-stats { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line); background: var(--card); margin-bottom: 20px; }
.exam-stat { padding: 16px 18px; border-right: 1px solid var(--line); }
.exam-stat:last-child { border-right: 0; }
.exam-stat small { display: block; color: var(--muted); font-size: 10px; font-weight: 850; text-transform: uppercase; letter-spacing: .08em; }
.exam-stat strong { display: block; margin-top: 5px; font: 500 25px Georgia, serif; }

.exam-map { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; padding: 1px; background: var(--line); }
.exam-group { min-height: 134px; padding: 15px; background: white; }
.exam-group.extended { background: #fff9e7; }
.exam-range { display: inline-block; padding: 4px 7px; color: white; background: var(--navy); font: 800 11px ui-monospace, monospace; }
.exam-group.extended .exam-range { background: var(--coral); }
.exam-group strong { display: block; margin: 11px 0 5px; font-size: 13px; }.exam-group p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.4; }

.tutor-layout { display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 20px; align-items: start; margin-top: 20px; }
.tutor-course { min-width: 0; }
.chat-column { position: sticky; top: 92px; }
.chat-panel { padding: 0; overflow: hidden; }
.chat-head { padding: 20px; color: white; background: var(--navy); }
.chat-head .eyebrow { color: var(--cyan); }.chat-head h3 { margin: 0 0 6px; font: 500 24px Georgia, serif; }.chat-head p { margin: 0; color: #c9d9dc; font-size: 12px; line-height: 1.45; }
.chat-messages { max-height: max(260px, calc(100vh - 340px)); overflow-y: auto; overscroll-behavior: contain; display: grid; gap: 11px; padding: 16px; background: #f6f5ef; }
.chat-message { max-width: 91%; padding: 11px 12px; white-space: pre-line; font-size: 12px; line-height: 1.5; }
.chat-message.tutor { justify-self: start; background: white; border: 1px solid var(--line); }
.chat-message.learner { justify-self: end; color: white; background: var(--navy-2); }
.quick-replies { display: flex; gap: 6px; overflow-x: auto; padding: 0 16px 12px; background: #f6f5ef; }
.quick-reply { flex: 0 0 auto; padding: 7px 9px; border: 1px solid #aabcbf; border-radius: 999px; color: var(--navy); background: white; font-size: 10px; font-weight: 750; }
.chat-form { display: grid; grid-template-columns: 1fr auto; gap: 7px; padding: 13px; border-top: 1px solid var(--line); background: white; }
.chat-form input { min-width: 0; padding: 10px; }.chat-form button { width: 42px; padding: 0; border: 0; color: white; background: var(--coral); font-size: 20px; }

.topic-kicker { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.tiny-chip { padding: 5px 8px; color: #704f06; background: var(--yellow-soft); font-size: 10px; font-weight: 850; }
.route-scene { margin-top: 22px; padding: 16px; border: 1px solid #b9d9d8; background: linear-gradient(#dff5f3 0 68%, #c7d9a0 68%); overflow: hidden; }
.route-scene svg { width: 100%; height: auto; display: block; }
.story-question { margin: 14px 0 0; padding: 13px 15px; border-left: 4px solid var(--yellow); background: var(--yellow-soft); line-height: 1.5; }

.idea-callout { display: grid; grid-template-columns: 72px 1fr; gap: 16px; align-items: center; margin: 22px 0; padding: 18px; color: white; background: var(--navy); }
.idea-icon { width: 62px; height: 62px; display: grid; place-items: center; border-radius: 50%; color: var(--navy); background: var(--yellow); font: 800 24px Georgia, serif; }
.idea-callout strong { display: block; margin-bottom: 4px; color: var(--cyan); text-transform: uppercase; font-size: 10px; letter-spacing: .1em; }.idea-callout p { margin: 0; font: 500 20px/1.35 Georgia, serif; }
.explain-stack { display: grid; gap: 12px; }
.explain-card { display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 17px; border: 1px solid var(--line); background: white; }
.explain-number { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--green); font-weight: 850; }
.explain-card h3 { margin: 0 0 5px; font: 600 19px Georgia, serif; }.explain-card p { margin: 0 0 10px; color: var(--muted); line-height: 1.55; }
.formula { display: inline-block; padding: 8px 10px; color: var(--navy); background: var(--cyan-soft); font: 750 15px ui-monospace, "Cascadia Mono", monospace; }

.derivation { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 8px; align-items: stretch; margin: 18px 0; }
.derive-step { display: grid; place-items: center; min-height: 84px; padding: 12px; border: 1px solid var(--line); background: white; text-align: center; font: 700 13px/1.45 ui-monospace, monospace; }
.derive-arrow { align-self: center; color: var(--coral); font-size: 24px; }

.worked-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 20px; }
.given-card { padding: 18px; border-left: 4px solid var(--cyan); background: #f7fbfa; font: 14px/1.8 ui-monospace, monospace; }
.given-card h3 { margin: 0 0 9px; font: 600 18px Georgia, serif; }.given-card ul { margin: 0; padding-left: 18px; }
.calc-steps { display: grid; gap: 9px; }
.calc-step { position: relative; padding: 14px 14px 14px 45px; border: 1px solid var(--line); background: white; }
.calc-step::before { content: attr(data-number); position: absolute; left: 13px; top: 13px; width: 23px; height: 23px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--coral); font-size: 11px; font-weight: 850; }
.calc-step code { display: block; margin-bottom: 5px; color: var(--navy); font: 750 14px ui-monospace, monospace; }.calc-step small { color: var(--muted); line-height: 1.45; }
.mistake-card { margin-top: 18px; padding: 17px; border: 1px solid #eab5a9; background: var(--coral-soft); }
.mistake-card strong { color: #8c3425; }.wrong-formula { display: inline-block; margin: 8px 0; padding: 6px 9px; text-decoration: line-through; background: white; font-family: ui-monospace, monospace; }

.concept-box { margin-top: 20px; padding: 18px; border: 1px solid #b8d9cd; background: #edf8f3; }
.concept-options { display: grid; gap: 7px; margin-top: 12px; }.concept-options button { padding: 10px; border: 1px solid #a9c9bd; text-align: left; color: var(--ink); background: white; }.concept-options button.correct { border-color: var(--green); background: #ccebdc; }.concept-options button.wrong { border-color: var(--coral); background: var(--coral-soft); }

.oge-format { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; margin: 18px 0; }
.format-card { padding: 14px; border-top: 4px solid var(--cyan); background: white; }.format-card:nth-child(2) { border-color: var(--yellow); }.format-card:nth-child(3) { border-color: var(--coral); }.format-card:nth-child(4) { border-color: var(--green); }.format-card strong { display: block; margin-bottom: 6px; }.format-card p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.45; }
.rubric-table { width: 100%; border-collapse: collapse; font-size: 12px; }.rubric-table th, .rubric-table td { padding: 10px; border: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.45; }.rubric-table th { color: white; background: var(--navy); }.rubric-score { width: 54px; text-align: center !important; font: 700 20px Georgia, serif; }

.exam-task { border: 1px solid var(--navy); background: white; }
.task-head { display: flex; justify-content: space-between; gap: 15px; padding: 11px 15px; color: white; background: var(--navy); }
.task-number { display: inline-grid; place-items: center; width: 30px; height: 30px; margin-right: 8px; color: var(--navy); background: var(--yellow); font: 850 13px ui-monospace, monospace; }.task-meta { font-size: 11px; color: #cbdadd; }
.task-body { padding: 20px; font: 500 18px/1.55 Georgia, serif; }
.mode-switch { display: flex; gap: 0; margin: 16px 0; }.mode-switch button { padding: 9px 12px; border: 1px solid var(--line); color: var(--navy); background: white; font-size: 11px; font-weight: 850; }.mode-switch button.active { color: white; background: var(--green); border-color: var(--green); }
.task-path { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 7px; margin: 0 0 16px; }
.task-step { min-height: 78px; padding: 9px; border: 1px solid var(--line); color: var(--ink); background: #fff; text-align: left; }
.task-step > span { display: inline-grid; place-items: center; width: 19px; height: 19px; margin-right: 4px; border-radius: 50%; color: white; background: var(--green); font-size: 10px; font-weight: 800; }.task-step small { color: var(--muted); font-size: 9px; }.task-step b { display: block; margin-top: 6px; font-size: 10px; line-height: 1.25; }.task-step.active { border-color: var(--coral); background: var(--coral-soft); box-shadow: inset 0 -3px 0 var(--coral); }.task-step.active > span { background: var(--coral); }
.choice-answer { display: grid; gap: 8px; margin: 0; padding: 15px; border: 1px solid var(--line); }.choice-answer legend { padding: 0 5px; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }.choice-answer label { display: flex; gap: 9px; align-items: flex-start; padding: 11px; border: 1px solid #d7e1df; background: white; line-height: 1.4; }.choice-answer input { margin-top: 3px; accent-color: var(--green); }
.variant-progress { display: flex; flex-wrap: wrap; gap: 7px; margin: 16px 0; }.variant-progress button { width: 35px; height: 35px; border: 1px solid var(--line); color: var(--navy); background: white; font-weight: 800; }.variant-progress button.active { color: white; border-color: var(--coral); background: var(--coral); }.variant-editor { margin-top: 16px; }
.answer-editor { display: grid; gap: 10px; }.editor-block { display: grid; grid-template-columns: 92px 1fr; gap: 10px; align-items: start; }.editor-label { padding-top: 12px; font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .06em; }.editor-block textarea { min-height: 76px; }.answer-line { display: grid; grid-template-columns: 92px 1fr; gap: 10px; align-items: center; }
.hint-output { margin-top: 10px; padding: 12px; color: #684d08; background: var(--yellow-soft); border-left: 3px solid var(--yellow); line-height: 1.45; }

.assessment { margin-top: 18px; padding: 18px; border: 1px solid var(--line); background: white; }
.ai-review { margin: 15px 0; padding: 14px; border: 1px solid #a9cbd5; background: var(--cyan-soft); line-height: 1.5; }
.ai-review p { margin: 4px 0 9px; }.ai-review small { color: var(--muted); }
.scoreline { display: flex; justify-content: space-between; align-items: center; gap: 15px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }.official-score { color: var(--coral); font: 500 34px Georgia, serif; }
.component-list { display: grid; gap: 8px; margin: 15px 0; }.component { display: grid; grid-template-columns: 115px 1fr 32px; gap: 8px; align-items: center; font-size: 11px; }.meter { height: 7px; overflow: hidden; background: #e7e4db; }.meter span { display: block; height: 100%; background: var(--green); }
.feedback { padding: 13px; border-left: 3px solid var(--coral); background: var(--paper); line-height: 1.5; }.tag-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; }.error-tag { padding: 5px 7px; color: #7e3429; background: var(--coral-soft); font: 700 10px ui-monospace, monospace; }

.photo-zone { display: grid; grid-template-columns: .8fr 1.2fr; gap: 18px; }
.photo-drop { min-height: 220px; display: grid; place-items: center; padding: 15px; border: 2px dashed #9fb8ba; background: #f7fbfa; text-align: center; }
.photo-drop input { max-width: 250px; border: 0; background: transparent; }.photo-preview { max-width: 100%; max-height: 330px; object-fit: contain; box-shadow: var(--shadow); }.photo-help { color: var(--muted); font-size: 11px; line-height: 1.45; }
.ocr-note { padding: 11px; color: #6d520e; background: var(--yellow-soft); font-size: 11px; line-height: 1.45; }

.history-list { display: grid; gap: 8px; }.history-item { display: flex; justify-content: space-between; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); }.history-item small { display: block; margin-top: 4px; color: var(--muted); }
.notice { margin: 10px 0; padding: 12px 14px; }.notice-error { color: #7b2f25; border: 1px solid #e9aea2; background: var(--coral-soft); }.notice-success { color: #1e654f; border: 1px solid #abd2c2; background: #e3f4ed; }
.footer { display: flex; justify-content: space-between; gap: 20px; padding-block: 38px; color: var(--muted); font-size: 11px; }

.lesson-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 0 0 18px; }
.lesson-tab { display: grid; grid-template-columns: 38px 1fr; grid-template-areas: "number section" "number title" "number format"; gap: 2px 10px; min-height: 118px; padding: 15px; border: 1px solid var(--line); color: var(--ink); background: rgba(255,255,255,.78); text-align: left; box-shadow: 0 5px 16px rgba(23,51,60,.05); }
.lesson-tab > span { grid-area: number; align-self: start; display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; color: white; background: var(--navy); font-weight: 850; }
.lesson-tab small { grid-area: section; color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .05em; }
.lesson-tab strong { grid-area: title; font: 600 17px/1.2 Georgia, serif; }
.lesson-tab em { grid-area: format; color: var(--green); font-size: 10px; font-style: normal; font-weight: 800; }
.lesson-tab.active { border-color: var(--coral); background: var(--coral-soft); box-shadow: inset 0 -4px 0 var(--coral); }
.lesson-tab.active > span { background: var(--coral); }
.compact-map { padding-block: 20px; }
.compact-map .panel-head { margin-bottom: 12px; }
.mini-variant-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.mini-variant-card { display: flex; flex-direction: column; justify-content: space-between; gap: 14px; min-height: 225px; padding: 18px; border: 1px solid var(--line); background: white; }
.mini-variant-card strong { font: 600 19px/1.2 Georgia, serif; }
.mini-variant-card p { margin-bottom: 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
.mini-variant-meta { display: flex; flex-wrap: wrap; gap: 7px; }
.mini-variant-meta span { padding: 5px 8px; color: var(--green); background: var(--mint); font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.full-variant-card.in_progress { border-color: #d89a14; box-shadow: inset 0 -4px 0 #d89a14; }
.full-variant-card.completed { border-color: var(--green); box-shadow: inset 0 -4px 0 var(--green); background: #f4fbf7; }
.full-variant-review { max-width: 980px; margin: 26px auto; }
.concept-scene { min-height: 210px; }
.answer-text { min-height: 88px; }
.diagnostic-screen, .diagnostic-finish { max-width: 900px; margin: 26px auto; }
.diagnostic-progress { margin-bottom: 18px; }
.diagnostic-progress span { display: grid; place-items: center; width: 35px; height: 35px; border: 1px solid var(--line); border-radius: 50%; background: white; color: var(--muted); font-weight: 800; }
.diagnostic-progress span.active { color: white; border-color: var(--coral); background: var(--coral); }
.diagnostic-progress span.done { color: var(--green); border-color: var(--green); background: #eff8f3; }
.diagnostic-long-answer { min-height: 170px; }
.learning-progress { margin: 20px 0; }
.collapsible-summary { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; cursor: pointer; list-style: none; }
.collapsible-summary::-webkit-details-marker { display: none; }
.collapsible-summary h2 { margin-bottom: 0; }
.collapsible-body { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }
.collapse-label { flex: 0 0 auto; padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--navy); background: white; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.collapse-label::after { content: " ↓"; }
.when-open { display: none; }
.collapsible-panel[open] .when-closed { display: none; }
.collapsible-panel[open] .when-open { display: inline; }
.collapsible-panel[open] .collapse-label::after { content: " ↑"; }
.progress-score { margin: 5px 0 0; color: var(--navy); }
.topic-progress { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.topic-progress-item { display: flex; justify-content: space-between; gap: 10px; padding: 12px; border: 1px solid var(--line); border-left: 5px solid var(--muted); border-radius: 10px; background: white; }
.topic-progress-item b, .topic-progress-item small { display: block; }.topic-progress-item small { margin-top: 4px; color: var(--muted); }
.topic-progress-item.mastered { border-left-color: var(--green); }.topic-progress-item.developing { border-left-color: #d89a14; }.topic-progress-item.needs_attention { border-left-color: var(--coral); }.topic-progress-item.not_checked { opacity: .72; }
.difficulty-progress { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }.difficulty-progress h3 { margin: 0 0 10px; }
.difficulty-row { display: grid; grid-template-columns: 100px 1fr 75px; gap: 10px; align-items: center; margin: 9px 0; }.difficulty-row b { text-align: right; }
.login-panel { max-width: 520px; margin: 36px auto; }.login-form { display: grid; gap: 14px; }
.account-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; max-width: 1180px; margin: 16px auto 0; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.74); color: var(--muted); font-size: 14px; }.account-bar strong { color: var(--ink); }.account-bar code { color: var(--navy); font-weight: 800; }
.admin-panel { margin: 20px 0; }.admin-roster { display: flex; flex-wrap: wrap; gap: 10px; }.student-card { min-width: 170px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: white; text-align: left; }.student-card strong, .student-card small { display: block; }.student-card small { margin-top: 4px; color: var(--muted); }.student-card.active { border-color: var(--coral); background: var(--coral-soft); }.student-create { margin-top: 15px; }.student-create summary { cursor: pointer; color: var(--navy); font-weight: 800; }.student-create form { margin-top: 14px; align-items: end; }
.diagnostic-review { margin: 20px 0; }.diagnostic-review-list { display: grid; gap: 10px; }.diagnostic-review-item { display: grid; grid-template-columns: 64px 1fr; gap: 14px; padding: 14px; border: 1px solid var(--line); border-left: 5px solid var(--coral); border-radius: 10px; background: white; }.diagnostic-review-item.correct { border-left-color: var(--green); }.review-score { display: grid; align-content: start; gap: 5px; color: var(--muted); }.review-score strong { color: var(--ink); font-size: 17px; }.diagnostic-review-item p { margin: 7px 0; }.review-answers { display: grid; gap: 6px; padding: 9px 11px; border-radius: 8px; background: var(--coral-soft); }.diagnostic-review-item.correct .review-answers { background: #eff8f3; }.diagnostic-review-item details { margin-top: 10px; }.diagnostic-review-item pre, .admin-attempt pre { white-space: pre-wrap; font: 14px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; }
.review-feedback { padding: 10px 12px; background: var(--yellow-soft); border-left: 3px solid var(--yellow); }.review-missing { color: #8c4035; }
.admin-overview { margin: 20px 0; }.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }.admin-stats div { padding: 16px; border-right: 1px solid var(--line); }.admin-stats div:last-child { border-right: 0; }.admin-stats strong, .admin-stats span { display: block; }.admin-stats strong { font: 700 28px/1 Georgia, serif; color: var(--navy); }.admin-stats span { margin-top: 5px; color: var(--muted); font-size: 13px; }.admin-student-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(245px, 1fr)); gap: 12px; }.admin-student-card { display: grid; gap: 7px; padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: white; color: var(--ink); text-align: left; }.admin-student-card strong { font: 700 20px/1.1 Georgia, serif; }.admin-student-card small { color: var(--muted); }.admin-student-card span { color: var(--muted); font-size: 13px; }.admin-student-card.active { border-color: var(--coral); box-shadow: inset 0 -4px 0 var(--coral); background: var(--coral-soft); }.admin-student-detail { margin: 20px 0; }.admin-student-detail h3, .admin-diagnostic h3 { margin: 22px 0 10px; }.admin-attempt { margin: 8px 0; padding: 11px 13px; border: 1px solid var(--line); border-radius: 8px; background: white; }.admin-attempt summary { cursor: pointer; font-weight: 800; }.admin-attempt p { margin: 9px 0; }.admin-create { margin: 20px 0; }.admin-create summary { cursor: pointer; color: var(--navy); font-weight: 800; }.admin-create form { margin-top: 14px; align-items: end; }

@media (max-width: 1020px) {
  .exam-map { grid-template-columns: repeat(3, 1fr); }
  .tutor-layout { grid-template-columns: 1fr; }
  .chat-column { position: static; order: -1; }
  .chat-messages { max-height: 300px; }
}
@media (max-width: 780px) {
  .hero { grid-template-columns: 1fr; gap: 20px; }.orbit-card { display: none; }
  .exam-stats { grid-template-columns: repeat(2, 1fr); }.exam-stat { border-bottom: 1px solid var(--line); }
  .field-grid, .level-options, .worked-grid, .photo-zone { grid-template-columns: 1fr; }
  .topic-progress, .mini-variant-grid { grid-template-columns: 1fr; }
  .account-bar { align-items: flex-start; flex-direction: column; }
  .admin-stats { grid-template-columns: repeat(2, 1fr); }.admin-stats div:nth-child(2) { border-right: 0; }.admin-stats div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }.diagnostic-review-item { grid-template-columns: 1fr; }
  .derivation { grid-template-columns: 1fr; }.derive-arrow { transform: rotate(90deg); justify-self: center; }
  .oge-format { grid-template-columns: repeat(2, 1fr); }
  .lesson-nav { grid-template-columns: 1fr; }
  .task-path { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-tab { min-height: 90px; }
}
@media (max-width: 540px) {
  .shell { width: min(100% - 20px, 1220px); }.topbar { padding-inline: 10px; }.quiet-link { display: none; }
  .hero { min-height: auto; padding-block: 40px 30px; } h1 { font-size: 42px; }
  .panel { padding: 21px 15px; }.panel-head, .dashboard-intro, .footer, .collapsible-summary { flex-direction: column; align-items: flex-start; }
  .exam-map, .oge-format { grid-template-columns: 1fr; }.exam-stats { grid-template-columns: 1fr 1fr; }.task-path { grid-template-columns: 1fr; }
  .editor-block, .answer-line { grid-template-columns: 1fr; gap: 4px; }.editor-label { padding-top: 0; }
  .component { grid-template-columns: 95px 1fr 28px; }
}