@font-face {
  font-family: "Noto Sans Thai";
  src: url("assets/fonts/NotoSansThai-Variable.ttf") format("truetype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}
:root {
  color-scheme: light;
  --bg: #f7f9fa;
  --surface: #fff;
  --surface-2: #edf1f3;
  --surface-3: #f2f5f6;
  --ink: #1f3038;
  --ink-soft: #31454d;
  --muted: #5d6b72;
  --faint: #5d6b72;
  --line: #dde4e6;
  --line-strong: #c7d2d5;
  --accent: #0d7480;
  --accent-ink: #fff;
  --accent-wash: #e5f2f2;
  --good: #286747;
  --good-wash: #e9f3ed;
  --bad: #a03630;
  --bad-wash: #f9edeb;
  --warning: #815b19;
  --warning-wash: #faf3e4;
  --radius-sm: 9px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --ease: cubic-bezier(.2,.7,.2,1);
  --side: 252px;
  font-family: "Noto Sans Thai", "Segoe UI Variable", "Segoe UI", "Leelawadee UI", Tahoma, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--bg); font-size: 15px; line-height: 1.65; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
a { color: inherit; }
::selection { background: #cde7e7; color: var(--ink); }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 10px 15px; transform: translateY(-160%); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); }
.skip-link:focus { transform: translateY(0); }
.app-shell { min-height: 100vh; }
.sidebar { position: fixed; z-index: 12; inset: 0 auto 0 0; display: flex; flex-direction: column; width: var(--side); padding: 24px 17px 17px; border-right: 1px solid var(--line); background: var(--surface); }
.brand { display: flex; align-items: center; gap: 11px; min-height: 47px; margin: 0 7px 29px; text-decoration: none; }
.brand-mark { display: block; width: 48px; height: 48px; flex: 0 0 48px; overflow: hidden; border-radius: 50%; background: #fff; }
.brand-mark img { display: block; width: 100%; height: 100%; object-fit: contain; }
.brand-name { display: grid; gap: 0; font-size: 15px; font-weight: 650; letter-spacing: .01em; line-height: 1.35; }
.brand-name small { color: var(--muted); font-size: 12px; font-weight: 400; letter-spacing: 0; }
.nav-heading, .eyebrow { margin: 0; color: var(--muted); font-size: 13px; font-weight: 500; line-height: 1.45; }
.nav-heading { padding: 0 11px 8px; }
.primary-nav { display: grid; gap: 3px; }
.nav-link { position: relative; display: flex; align-items: center; gap: 12px; width: 100%; min-height: 44px; padding: 8px 11px; border: 0; border-radius: 11px; background: transparent; color: var(--ink-soft); text-align: left; font-size: 14px; cursor: pointer; transition: background-color 150ms var(--ease), color 150ms var(--ease), transform 150ms var(--ease); }
.nav-link:hover { transform: translateX(2px); background: var(--surface-3); }
.nav-link.active { background: var(--accent-wash); color: var(--accent); font-weight: 600; }
.nav-link.active::before { position: absolute; top: 10px; bottom: 10px; left: -17px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); content: ""; }
.nav-icon { display: block; width: 28px; height: 28px; flex: 0 0 28px; padding: 5px; border-radius: 9px; background: var(--surface-3); color: currentColor; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.nav-link.active .nav-icon { background: var(--surface); }
.sidebar-bottom { margin-top: auto; }
.profile-mini { display: flex; align-items: center; gap: 10px; padding: 12px 7px 14px; border-top: 1px solid var(--line); }
.profile-avatar { display: grid; width: 34px; height: 34px; flex: 0 0 34px; place-items: center; border-radius: 50%; background: var(--surface-2); color: var(--ink); font-weight: 600; }
.profile-mini > span:nth-child(2) { display: grid; min-width: 0; flex: 1; }
.profile-mini strong { overflow: hidden; font-size: 13px; font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }
.profile-mini small, .sidebar-foot { color: var(--muted); font-size: 12px; }
.sidebar-foot { margin: 0; padding: 7px 7px 0; }
.icon-button, .top-icon { display: grid; width: 38px; height: 38px; flex: 0 0 38px; place-items: center; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--muted); font-size: 20px; cursor: pointer; transition: background-color 150ms ease, border-color 150ms ease; }
.icon-button:hover, .top-icon:hover { border-color: var(--line); background: var(--surface-3); color: var(--ink); }
.main-content { min-width: 0; margin-left: var(--side); }
.topbar { position: sticky; z-index: 10; top: 0; display: flex; align-items: center; min-height: 66px; gap: 17px; padding: 0 clamp(22px, 4vw, 57px); border-bottom: 1px solid var(--line); background: var(--surface); }
.breadcrumb { display: flex; min-width: 0; align-items: center; gap: 10px; color: var(--ink-soft); font-size: 13px; }
.crumb-separator, .crumb-current { color: var(--faint); }
.search-box { display: flex; width: min(310px, 37vw); height: 39px; align-items: center; gap: 9px; margin-left: auto; padding: 0 10px; border: 1px solid var(--line); border-radius: 11px; background: var(--bg); color: var(--muted); transition: border-color 150ms ease, background 150ms ease; }
.search-box:focus-within { border-color: var(--accent); background: var(--surface); }
.search-box > span { font-size: 21px; line-height: 1; }
.search-box input { width: 100%; min-width: 0; border: 0; background: transparent; color: var(--ink); font-size: 13px; }
.search-box:focus-within { outline: 3px solid var(--accent); outline-offset: 3px; }
.search-box input::placeholder { color: var(--faint); }
.search-box kbd { min-width: 20px; padding: 0 5px; border: 1px solid var(--line); border-radius: 5px; color: var(--faint); font-family: inherit; font-size: 11px; text-align: center; }
.top-icon { margin-left: 1px; font-size: 17px; }
.page-wrap { width: min(100%, 1360px); margin: 0 auto; padding: clamp(31px, 4vw, 55px) clamp(22px, 4vw, 57px) 34px; }
.page { min-width: 0; }
.dashboard-intro[data-enter] { animation: hero-enter 430ms cubic-bezier(.2,.7,.2,1) both; }
@keyframes hero-enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.page-heading { margin: 0 0 29px; }
.page-heading .eyebrow { margin-bottom: 8px; }
.page-heading h1, .welcome-copy h1, .lesson-heading h1 { margin: 0; font-size: clamp(28px, 3vw, 40px); font-weight: 650; letter-spacing: 0; line-height: 1.3; }
.page-heading > p:last-child, .welcome-desc, .lesson-heading > p:last-child { max-width: 720px; margin: 9px 0 0; color: var(--muted); font-size: 15px; line-height: 1.7; }
.dashboard-intro { display: flex; min-height: 218px; align-items: center; justify-content: space-between; gap: 30px; padding: 27px 30px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.welcome-copy { max-width: 670px; }
.welcome-copy .eyebrow { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.welcome-copy h1 { font-size: clamp(30px, 3.4vw, 43px); }
.welcome-copy h1 span { color: var(--accent); }
.welcome-desc { margin-top: 8px; }
.welcome-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.today-stamp { display: grid; width: 190px; flex: 0 0 190px; gap: 7px; padding-left: 28px; border-left: 1px solid var(--line); }
.today-stamp > span, .today-stamp small { color: var(--muted); font-size: 13px; }
.today-stamp strong { font-size: 19px; font-weight: 500; letter-spacing: -.02em; line-height: 1.35; font-variant-numeric: tabular-nums; }
.today-stamp small b { color: var(--ink); font-weight: 500; }
.mini-track, .progress-track { display: block; height: 6px; overflow: hidden; border-radius: 8px; background: var(--surface-2); }
.mini-track span, .progress-track i { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--accent); transition: width 240ms var(--ease); }
.home-main-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(260px, .9fr); gap: 17px; margin-top: 18px; }
.resume-panel, .daily-panel, .activity-panel, .planner-peek, .setup-paper, .exam-intro, .formula-workspace, .quiz-stage, .result-panel, .planner-week, .planner-tasks { min-width: 0; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.resume-card { display: grid; width: 100%; grid-template-columns: 42px minmax(0, 1fr) 25px; align-items: center; gap: 13px; min-height: 106px; padding: 14px 13px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-3); text-align: left; cursor: pointer; transition: background 150ms ease, border-color 150ms ease, transform 150ms var(--ease); }
.resume-card:hover { transform: translateY(-2px); border-color: var(--line-strong); background: var(--surface); }
.resume-number { display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--accent); font-size: 13px; }
.resume-copy { display: grid; gap: 1px; }
.resume-copy small { color: var(--muted); font-size: 12px; }
.resume-copy strong { font-size: 16px; font-weight: 500; }
.resume-copy > span { color: var(--muted); font-size: 13px; }
.resume-arrow { color: var(--accent); font-size: 20px; }
.section-title-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 14px; margin: 0 0 17px; }
.section-title-row h2, .settings-group h2 { margin: 2px 0 0; font-size: 19px; font-weight: 600; letter-spacing: 0; line-height: 1.4; }
.section-title-row p:not(.eyebrow) { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
.text-button, .back-link { display: inline-flex; min-height: 40px; align-items: center; gap: 6px; padding: 5px 3px; border: 0; background: transparent; color: var(--accent); text-align: left; text-decoration: none; font-size: 13px; font-weight: 500; cursor: pointer; }
.text-button:hover, .back-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.button { display: inline-flex; min-height: 43px; align-items: center; justify-content: center; gap: 9px; padding: 9px 16px; border: 1px solid transparent; border-radius: 10px; font-size: 14px; font-weight: 500; line-height: 1.35; text-decoration: none; cursor: pointer; transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms var(--ease); }
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button:active:not(:disabled) { transform: translateY(1px); }
.button:disabled { cursor: not-allowed; opacity: .5; }
.button-primary { background: var(--accent); color: var(--accent-ink); }
.button-primary:hover:not(:disabled) { background: #095e68; }
.button-secondary { border-color: var(--line-strong); background: var(--surface); color: var(--ink); }
.button-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.button-danger { border-color: #e1beba; background: var(--surface); color: var(--bad); }
.daily-panel { display: flex; flex-direction: column; align-items: flex-start; }
.daily-panel > p { min-height: 46px; margin: 0 0 15px; color: var(--ink-soft); font-size: 14px; }
.daily-mark { display: grid; width: 37px; height: 37px; place-items: center; border: 1px solid var(--line); border-radius: 11px; color: var(--accent); font-size: 20px; }
.daily-progress { display: flex; width: 100%; align-items: center; gap: 12px; margin: auto 0 16px; color: var(--muted); font-size: 12px; }
.daily-progress .progress-track { flex: 1; }
.daily-progress i { display: block; height: 100%; border-radius: inherit; background: var(--accent); }
.daily-study { display: grid; width: 100%; gap: 6px; margin-bottom: 15px; color: var(--muted); font-size: 12px; }
.daily-study strong { color: var(--ink-soft); font-weight: 500; }
.section-block { margin-top: 33px; }
.section-block > .section-title-row { margin-bottom: 15px; }
.course-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 11px; }
.course-card { display: grid; min-height: 120px; grid-template-columns: 38px 1fr auto; align-items: start; gap: 11px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); text-align: left; cursor: pointer; transition: border-color 150ms ease, transform 150ms var(--ease), background 150ms ease; }
.course-card:hover { transform: translateY(-2px); border-color: var(--line-strong); background: #fcfefe; }
.course-symbol { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid var(--line); border-radius: 11px; background: var(--surface-3); color: var(--accent); font-family: Georgia, serif; font-size: 19px; }
.course-card-copy { display: grid; gap: 3px; min-width: 0; }
.course-card-copy strong { font-size: 14px; font-weight: 500; }
.course-card-copy small { color: var(--muted); font-size: 12px; line-height: 1.5; }
.course-card-meta { display: grid; justify-items: end; gap: 8px; color: var(--muted); font-size: 11px; }
.course-card-meta b { color: var(--ink-soft); font-size: 12px; font-weight: 500; }
.lower-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 17px; }
.activity-panel, .planner-peek { padding: 20px 21px; }
.activity-row, .planner-peek-row { display: flex; align-items: center; gap: 11px; min-height: 54px; border-top: 1px solid var(--line); }
.activity-dot { width: 8px; height: 8px; flex: 0 0 8px; border-radius: 50%; background: var(--accent); }
.activity-row span:nth-child(2), .planner-peek-row span:nth-child(2) { display: grid; flex: 1; }
.activity-row strong, .planner-peek-row strong { font-size: 13px; font-weight: 500; }
.activity-row small, .planner-peek-row small { color: var(--muted); font-size: 12px; }
.activity-row time { color: var(--muted); font-size: 12px; }
.empty-inline { margin: 0; padding: 13px 0 2px; color: var(--muted); font-size: 13px; }
.planner-peek-row input[type="checkbox"] { accent-color: var(--accent); }
.page-footer { display: flex; align-items: center; gap: 8px; margin-top: 36px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-local { margin-left: auto; }
.sample-note { color: var(--muted); font-size: 13px; }

.course-summary { display: flex; flex-wrap: wrap; gap: 14px 25px; margin: -3px 0 20px; color: var(--muted); font-size: 13px; }
.course-summary strong { color: var(--ink); font-weight: 500; }
.catalog-layout { display: grid; grid-template-columns: minmax(210px, .78fr) minmax(0, 1.7fr); gap: 20px; align-items: start; }
.catalog-tabs { display: grid; gap: 4px; }
.catalog-tab { display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; align-items: center; gap: 7px; min-height: 54px; padding: 7px 10px; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--ink-soft); text-align: left; cursor: pointer; }
.catalog-tab:hover { background: var(--surface-2); }
.catalog-tab.selected { border-color: #c4ddde; background: var(--accent-wash); color: var(--accent); }
.catalog-tab-index { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.catalog-tab strong { font-size: 13px; font-weight: 500; }
.catalog-tab small { color: var(--muted); font-size: 12px; white-space: nowrap; }
.catalog-results { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.catalog-row { display: grid; width: 100%; grid-template-columns: 37px minmax(0, 1fr) auto; align-items: center; gap: 12px; min-height: 68px; padding: 10px 16px; border: 0; border-bottom: 1px solid var(--line); background: var(--surface); text-align: left; cursor: pointer; }
.catalog-row:last-child { border-bottom: 0; }
.catalog-row:hover { background: var(--surface-3); }
.catalog-number { color: var(--accent); font-size: 13px; font-variant-numeric: tabular-nums; }
.catalog-copy { display: grid; gap: 1px; }
.catalog-copy small { color: var(--muted); font-size: 12px; }
.catalog-copy strong { font-size: 14px; font-weight: 500; }
.catalog-state { color: var(--muted); font-size: 12px; }
.catalog-row.is-done .catalog-state { color: var(--good); }
.empty-state { padding: 25px; color: var(--muted); text-align: center; }

.lesson-heading { max-width: 760px; margin: 0 0 22px; }
.back-link { margin: 0 0 13px; color: var(--muted); }
.lesson-heading .eyebrow { margin: 0 0 6px; }
.lesson-heading h1 { font-size: 33px; }
.lesson-media { display: grid; grid-template-columns: minmax(0, 1fr) 250px; align-items: start; gap: 14px; margin: 0 0 22px; }
.lesson-media-video, .lesson-media-sheet { min-width: 0; padding: 17px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.lesson-media-video h2, .lesson-media-sheet h2 { margin: 0 0 11px; font-size: 15px; font-weight: 600; }
.video-placeholder { display: flex; min-height: 185px; aspect-ratio: 16 / 9; align-items: center; justify-content: center; gap: 13px; padding: 18px; border: 1px dashed var(--line-strong); border-radius: 11px; background: var(--surface-3); color: var(--muted); }
.video-play { display: grid; width: 42px; height: 42px; flex: 0 0 42px; place-items: center; border: 1px solid var(--line-strong); border-radius: 50%; background: var(--surface); color: var(--accent); }
.video-play svg { width: 20px; height: 20px; fill: currentColor; }
.video-placeholder > div { display: grid; gap: 3px; }
.video-placeholder strong { color: var(--ink-soft); font-size: 14px; font-weight: 500; }
.video-placeholder > div > span, .media-status { font-size: 12px; }
.media-status { align-self: flex-start; margin-left: auto; padding: 4px 8px; border-radius: 999px; background: var(--surface-2); white-space: nowrap; }
.lesson-media-video video { display: block; width: 100%; aspect-ratio: 16 / 9; border-radius: 11px; background: #e8edef; object-fit: contain; }
.lesson-media-sheet { display: grid; min-height: 0; grid-template-columns: 34px minmax(0, 1fr); align-content: start; align-items: center; gap: 8px 10px; padding: 14px; }
.sheet-icon { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 9px; background: var(--accent-wash); color: var(--accent); }
.sheet-icon svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.7; }
.sheet-copy h2 { margin: 0 0 3px; font-size: 14px; }
.sheet-copy p { margin: 0; color: var(--muted); font-size: 12px; }
.lesson-media-sheet .button { grid-column: 1 / -1; width: 100%; min-height: 36px; padding: 6px 9px; font-size: 12px; }
.lesson-navigation { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0 0 24px; }
.lesson-nav-button { display: grid; min-width: 195px; min-height: 58px; justify-items: start; gap: 2px; padding: 8px 13px; text-align: left; }
.lesson-nav-button strong { max-width: 100%; overflow: hidden; font-size: 13px; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.lesson-nav-button:last-child { justify-items: end; text-align: right; }
.lesson-navigation-current { color: var(--muted); font-size: 12px; white-space: nowrap; }
.math-line { margin-top: 5px; color: var(--ink); font-family: "DM Mono", "Leelawadee UI", Tahoma, monospace; font-size: 15px; line-height: 1.7; overflow-wrap: anywhere; }

.setup-paper { max-width: 860px; padding: 22px; }
.setup-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
.field { display: grid; gap: 6px; min-width: 0; }
.field label, .settings-form > label, .task-dialog label { color: var(--ink-soft); font-size: 13px; font-weight: 500; }
.field select, .field input, .settings-form input:not([type="checkbox"]), .settings-form select, .task-dialog input, .task-dialog select { width: 100%; min-height: 44px; padding: 8px 11px; border: 1px solid var(--line-strong); border-radius: 9px; background: var(--surface); color: var(--ink); font-size: 14px; }
.setup-note { margin: 15px 0 17px; color: var(--muted); font-size: 13px; }
.setup-actions { display: flex; flex-wrap: wrap; gap: 9px; padding-top: 15px; border-top: 1px solid var(--line); }
.exam-intro { display: grid; max-width: 920px; grid-template-columns: minmax(0, 1.3fr) minmax(240px, .7fr); gap: 25px; }
.exam-intro h2 { margin: 0 0 8px; font-size: 19px; font-weight: 500; }
.exam-intro p { margin: 0; color: var(--muted); line-height: 1.75; }
.exam-controls { display: grid; max-width: 500px; grid-template-columns: 1fr 1fr; gap: 11px; margin: 18px 0; }
.exam-facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; align-content: center; }
.exam-fact { padding: 12px; border: 1px solid var(--line); border-radius: 10px; }
.exam-fact strong { display: block; font-size: 20px; font-weight: 500; }
.exam-fact small { color: var(--muted); font-size: 12px; }
.exam-layout { display: grid; max-width: 1080px; grid-template-columns: minmax(200px, .65fr) minmax(0, 1.6fr); gap: 14px; align-items: start; }
.exam-rail, .exam-question-paper { min-width: 0; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.exam-rail-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.exam-rail-top strong { font-size: 14px; font-weight: 500; }
.exam-rail > p { color: var(--muted); font-size: 12px; line-height: 1.65; }
.exam-question-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 7px; }
.exam-number { position: relative; min-height: 39px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); cursor: pointer; }
.exam-number.selected { border-color: var(--accent); background: var(--accent-wash); color: var(--accent); }
.exam-number.answered { border-color: var(--good); background: var(--good-wash); color: var(--good); }
.exam-number.flagged::after { position: absolute; top: 4px; right: 4px; width: 6px; height: 6px; border-radius: 50%; background: var(--warning); content: ""; }
.exam-legend { display: grid; gap: 5px; margin-top: 13px; color: var(--muted); font-size: 12px; }
.exam-legend span { display: flex; align-items: center; gap: 7px; }
.exam-legend i { width: 8px; height: 8px; border-radius: 50%; background: var(--good); }
.exam-legend i.flagged { background: var(--warning); }
.exam-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin-top: 18px; padding-top: 13px; border-top: 1px solid var(--line); }
.exam-actions > span { flex: 1; }
.exam-actions .button { min-height: 40px; padding: 7px 11px; font-size: 13px; }
.exam-review-list { display: grid; max-width: 960px; gap: 10px; margin: 20px auto; }
.exam-review-item { padding: 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); }
.exam-review-item h3 { margin: 0 0 5px; font-size: 14px; font-weight: 500; }
.exam-review-item p { margin: 4px 0; color: var(--ink-soft); font-size: 13px; }
.exam-review-item .review-answer { color: var(--accent); }
.quiz-stage { max-width: 960px; padding: 22px; }
.quiz-stage-head { display: flex; align-items: center; gap: 14px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.quiz-stage-head > span:first-child { color: var(--muted); font-size: 13px; white-space: nowrap; }
.quiz-stage-head .progress-track { flex: 1; }
.quiz-clock { color: var(--accent); font-size: 14px; font-weight: 500; font-variant-numeric: tabular-nums; }
.quiz-question { margin: 23px 0 17px; white-space: pre-line; font-size: clamp(18px, 2vw, 23px); font-weight: 500; line-height: 1.6; }
.quiz-formula { display: block; margin-top: 11px; font-family: "DM Mono", "Leelawadee UI", Tahoma, monospace; font-size: clamp(16px, 1.8vw, 20px); font-weight: 400; overflow-wrap: anywhere; }
.answer-list { display: grid; gap: 8px; }
.answer-choice { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 52px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); text-align: left; cursor: pointer; transition: border-color 140ms ease, background 140ms ease, transform 140ms ease; }
.answer-choice:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--line-strong); background: var(--surface-3); }
.answer-choice.selected { border-color: var(--accent); background: var(--accent-wash); }
.answer-choice.correct { border-color: var(--good); background: var(--good-wash); }
.answer-choice.wrong { border-color: var(--bad); background: var(--bad-wash); }
.answer-choice:disabled { cursor: default; }
.answer-letter { display: grid; width: 28px; height: 28px; flex: 0 0 28px; place-items: center; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-size: 12px; }
.answer-label { min-width: 0; font-size: 14px; line-height: 1.65; overflow-wrap: anywhere; }
.answer-label.math { font-family: "DM Mono", "Leelawadee UI", Tahoma, monospace; }
.fill-answer { display: grid; gap: 8px; }
.fill-answer label { color: var(--muted); font-size: 13px; }
.fill-answer input { min-height: 50px; padding: 10px 13px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface); color: var(--ink); font-family: "DM Mono", "Leelawadee UI", Tahoma, monospace; font-size: 15px; }
.answer-explanation { margin: 15px 0 0; padding: 12px 14px; border-radius: 10px; color: var(--ink-soft); font-size: 14px; line-height: 1.7; }
.answer-explanation.right { background: var(--good-wash); }
.answer-explanation.review { background: var(--bad-wash); }
.answer-explanation small { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
.quiz-stage-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 19px; padding-top: 13px; border-top: 1px solid var(--line); }
.quiz-feedback { margin: 0; color: var(--muted); font-size: 13px; }
.quiz-feedback.right { color: var(--good); }
.quiz-feedback.wrong { color: var(--bad); }
.quiz-result { display: grid; justify-items: center; padding: 25px 5px; text-align: center; }
.result-mark { display: grid; width: 54px; height: 54px; place-items: center; border: 1px solid var(--line); border-radius: 18px; background: var(--accent-wash); color: var(--accent); font-size: 25px; }
.quiz-result h2 { margin: 14px 0 0; font-size: 23px; font-weight: 500; }
.quiz-result p { margin: 6px 0 0; color: var(--muted); }
.quiz-result > strong { color: var(--accent); font-size: 49px; font-weight: 500; font-variant-numeric: tabular-nums; }
.quiz-result > strong small { font-size: 20px; }
.quiz-result > span { color: var(--muted); font-size: 14px; }
.result-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 9px; margin-top: 18px; }
.match-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match-item { min-height: 58px; padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); text-align: left; line-height: 1.5; cursor: pointer; overflow-wrap: anywhere; }
.match-item.selected { border-color: var(--accent); background: var(--accent-wash); }
.match-item.matched { border-color: var(--good); background: var(--good-wash); }
.match-prompt { display: grid; align-content: center; gap: 6px; min-height: 100px; padding: 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-3); }
.match-prompt small { color: var(--muted); font-size: 12px; }
.match-prompt strong { font-size: 15px; font-weight: 500; }
.flash-answer { display: grid; gap: 13px; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-3); }
.flash-answer > p { margin: 0; color: var(--muted); font-size: 13px; }
.rating-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.rating-actions .button { min-width: 110px; }

.formula-overview { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 0 0 19px; }
.formula-stat { padding: 14px 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.formula-stat span { display: block; color: var(--muted); font-size: 12px; }
.formula-stat strong { display: block; margin-top: 2px; font-size: 23px; font-weight: 500; font-variant-numeric: tabular-nums; }
.formula-workspace { display: grid; max-width: 1050px; grid-template-columns: minmax(230px, .75fr) minmax(0, 1.4fr); gap: 24px; }
.formula-filters { display: grid; align-content: start; gap: 13px; }
.formula-mode-list { display: grid; gap: 5px; }
.formula-mode-list { min-width: 0; margin: 0; padding: 0; border: 0; }
.mode-option { display: flex; align-items: flex-start; gap: 10px; padding: 9px 7px; border: 1px solid transparent; border-radius: 9px; cursor: pointer; }
.mode-option:has(input:checked) { border-color: #c4ddde; background: var(--accent-wash); }
.mode-option input { margin-top: 4px; accent-color: var(--accent); }
.mode-option span { display: grid; gap: 1px; }
.mode-option strong { font-size: 13px; font-weight: 500; }
.mode-option small { color: var(--muted); font-size: 12px; }
.formula-start { display: grid; align-content: center; gap: 17px; padding: 23px; border-radius: 12px; background: var(--surface-3); }
.formula-start h2 { margin: 0; font-size: 21px; font-weight: 500; }
.formula-start > p { margin: -8px 0 1px; color: var(--muted); }
.formula-preview { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.formula-preview-card { min-height: 90px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.formula-preview-card small { color: var(--muted); font-size: 12px; }
.formula-preview-card strong { display: block; margin-top: 8px; font-size: 14px; font-weight: 500; line-height: 1.55; }
.record-section { margin-top: 31px; }
.record-summary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.record-summary > div { display: grid; gap: 4px; padding: 16px 18px; border-right: 1px solid var(--line); }
.record-summary > div:last-child { border: 0; }
.record-summary > div > span { color: var(--muted); font-size: 13px; }
.record-summary strong { font-size: 25px; font-weight: 500; line-height: 1.35; font-variant-numeric: tabular-nums; }
.record-summary strong small { margin-left: 3px; color: var(--muted); font-size: 13px; font-weight: 400; }
.category-progress { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 22px; }
.category-row { padding: 14px 0; border-top: 1px solid var(--line); }
.category-row-head { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 7px; font-size: 13px; }
.category-row-head strong { font-weight: 500; }
.category-row-head span { color: var(--muted); }
.formula-list { display: grid; }
.formula-list-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 13px 10px; border-top: 1px solid var(--line); }
.formula-list-row strong { display: block; font-size: 13px; font-weight: 500; }
.formula-list-row .math-line { margin-top: 3px; font-size: 13px; }
.formula-list-row small { color: var(--muted); font-size: 12px; }
#formula-stats { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.result-mistakes { max-width: 900px; margin: 15px auto 0; }
.result-mistakes h2 { font-size: 18px; font-weight: 500; }
.status-pill { display: inline-flex; min-height: 26px; align-items: center; padding: 3px 9px; border-radius: 20px; background: var(--surface-2); color: var(--ink-soft); font-size: 12px; white-space: nowrap; }
.status-pill.mastered { background: var(--good-wash); color: var(--good); }
.status-pill.due { background: var(--warning-wash); color: var(--warning); }
.challenge-history { display: flex; flex-wrap: wrap; gap: 8px; }
.challenge-day { display: grid; min-width: 90px; gap: 2px; padding: 11px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.challenge-day strong { font-size: 14px; font-weight: 500; }
.challenge-day small { color: var(--muted); font-size: 12px; }
.activity-chart { display: grid; height: 180px; grid-template-columns: repeat(7, minmax(0, 1fr)); align-items: end; gap: clamp(8px, 2vw, 23px); padding: 12px 11px 0; border-bottom: 1px solid var(--line-strong); background-image: repeating-linear-gradient(to bottom, transparent 0 43px, var(--line) 44px 45px); }
#formula-stats > div { min-width: 0; padding: 14px 12px; }
#formula-stats strong { font-size: 21px; }
.chart-day { display: grid; height: 100%; grid-template-rows: 1fr auto; align-items: end; gap: 8px; text-align: center; }
.chart-bar-wrap { display: flex; height: 100%; align-items: end; justify-content: center; }
.chart-bar { width: min(38px, 74%); min-height: 3px; border-radius: 6px 6px 0 0; background: var(--accent); }
.chart-day small { padding-bottom: 6px; color: var(--muted); font-size: 12px; }
.module-records { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 36px; }
.module-record { padding: 15px 0 13px; border-top: 1px solid var(--line); }
.module-record-head { display: flex; align-items: baseline; gap: 7px; }
.module-record-head h3 { margin: 0; font-size: 14px; font-weight: 500; }
.record-count { margin-left: auto; color: var(--muted); font-size: 12px; }
.record-track { height: 5px; margin: 8px 0; overflow: hidden; border-radius: 6px; background: var(--surface-2); }
.record-track > span { display: block; height: 100%; background: var(--accent); }
.record-lessons { display: flex; flex-wrap: wrap; gap: 5px 13px; }
.record-lesson { display: inline-flex; min-height: 35px; align-items: center; gap: 5px; padding: 3px 0; border: 0; background: transparent; color: var(--muted); font-size: 13px; cursor: pointer; }
.record-lesson.is-done { color: var(--good); }
.score-history { border-top: 1px solid var(--line); }
.score-row { display: grid; grid-template-columns: 130px minmax(0, 1fr) 64px; align-items: center; gap: 12px; min-height: 50px; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.score-date, .score-row small { color: var(--muted); font-size: 12px; }
.score-row strong { font-size: 13px; font-weight: 500; }
.score-value { justify-self: end; color: var(--accent); font-weight: 500; }
.topic-insights { display: flex; flex-wrap: wrap; gap: 8px; }
.topic-chip { padding: 7px 10px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); font-size: 13px; }
.topic-chip.strong-topic { border-color: #c9ded0; background: var(--good-wash); color: var(--good); }
.topic-chip.needs-review { border-color: #e3c9c6; background: var(--bad-wash); color: var(--bad); }

.planner-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
.planner-summary { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.planner-summary-card { min-width: 145px; padding: 11px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); }
.planner-summary-card span { display: block; color: var(--muted); font-size: 12px; }
.planner-summary-card strong { font-size: 20px; font-weight: 500; }
.planner-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(250px, .9fr); gap: 15px; }
.planner-week, .planner-tasks { padding: 18px; }
.week-controls { display: flex; gap: 4px; }
.week-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.week-day { display: grid; min-height: 86px; align-content: start; justify-items: center; gap: 6px; padding: 9px 3px; border: 1px solid transparent; border-radius: 10px; background: var(--surface-3); cursor: pointer; }
.week-day:hover { border-color: var(--line-strong); }
.week-day.selected { border-color: var(--accent); background: var(--accent-wash); }
.week-day.today .day-number { color: var(--accent); font-weight: 600; }
.week-day small { color: var(--muted); font-size: 11px; }
.day-number { font-size: 16px; }
.day-dots { display: flex; gap: 3px; }
.day-dots i { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.planner-task { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; align-items: start; gap: 8px; padding: 12px 1px; border-top: 1px solid var(--line); }
.planner-task input { margin: 4px 0 0; accent-color: var(--accent); }
.planner-task-copy strong { display: block; font-size: 13px; font-weight: 500; }
.planner-task-copy small { color: var(--muted); font-size: 12px; }
.task-actions { display: flex; gap: 1px; }
.task-actions button { min-width: 36px; min-height: 36px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); cursor: pointer; }
.task-actions button:hover { background: var(--surface-2); color: var(--ink); }
.task-done .planner-task-copy strong { color: var(--muted); text-decoration: line-through; }
.task-dialog { width: min(440px, calc(100vw - 26px)); padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); color: var(--ink); }
.task-dialog::backdrop { background: rgb(20 38 46 / 40%); }
.task-dialog form { display: grid; gap: 12px; }
.dialog-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2px; }
.dialog-head h2 { margin: 0; font-size: 20px; font-weight: 500; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

.settings-form { max-width: 850px; }
.settings-group { display: grid; grid-template-columns: minmax(170px, .7fr) minmax(0, 1.3fr); gap: 10px 25px; padding: 21px 0; border-top: 1px solid var(--line); }
.settings-group > div:first-child { grid-row: span 6; }
.settings-group h2 { margin: 0; font-size: 17px; }
.settings-group p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.settings-group > label:not(.setting-row) { align-self: end; color: var(--ink-soft); font-size: 13px; }
.settings-group > input { grid-column: 2; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; padding: 7px 0; border-top: 1px solid var(--line); cursor: pointer; }
.setting-row > span { display: grid; }
.setting-row strong { font-size: 14px; font-weight: 500; }
.setting-row small { color: var(--muted); font-size: 12px; }
.setting-row select { width: auto; min-width: 125px; }
.setting-row input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--accent); }
.danger-zone { align-items: center; }
.danger-zone > div:first-child { grid-row: auto; }
.danger-zone .button { justify-self: start; }

.mascot { position: fixed; z-index: 25; right: 18px; bottom: 18px; display: flex; align-items: flex-end; max-width: calc(100vw - 20px); pointer-events: none; }
.mascot-face { width: 90px; height: 172px; flex: 0 0 90px; padding: 5px; border: 1px solid #394047; border-radius: 24px; background: #07090b; color: #fff; box-shadow: 0 8px 24px rgb(20 32 40 / 22%); cursor: pointer; pointer-events: auto; transition: transform 160ms var(--ease), box-shadow 160ms var(--ease); }
.mascot-face:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgb(20 32 40 / 30%); }
.mascot-art { display: block; width: 100%; height: 100%; overflow: visible; }
.mascot-bubble { position: absolute; right: 0; bottom: calc(100% + 10px); width: max-content; max-width: min(230px, calc(100vw - 24px)); padding: 10px 14px; border: 1px solid var(--line); border-radius: 15px 15px 5px 15px; background: var(--surface); color: var(--ink-soft); text-align: left; font-size: 13px; line-height: 1.5; box-shadow: 0 8px 24px rgb(20 32 40 / 14%); pointer-events: auto; cursor: pointer; }
.mascot-bubble:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.mascot-bubble::after { position: absolute; right: 20px; bottom: -6px; width: 10px; height: 10px; transform: rotate(45deg); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); content: ""; }
.mascot.hidden { display: none; }
.exam-in-progress .mascot-face { width: 72px; height: 138px; flex-basis: 72px; }
.mascot.minimized .mascot-bubble { display: none; }
.toast { position: fixed; z-index: 30; right: 22px; bottom: 20px; max-width: min(440px, calc(100vw - 36px)); padding: 12px 15px; border: 1px solid var(--ink); border-radius: 11px; background: var(--ink); color: white; font-size: 13px; opacity: 0; pointer-events: none; transform: translateY(8px); transition: opacity 160ms ease, transform 160ms ease; }
.toast.show { opacity: 1; transform: translateY(0); }
[hidden] { display: none !important; }

html[data-theme="dark"] { color-scheme: dark; --bg: #151d20; --surface: #1d282c; --surface-2: #2a373b; --surface-3: #222f33; --ink: #e9f0f1; --ink-soft: #d2dfe1; --muted: #a5b5b8; --faint: #839497; --line: #344348; --line-strong: #526268; --accent: #58b4b8; --accent-ink: #102426; --accent-wash: #243c3e; --good: #86c59e; --good-wash: #23392e; --bad: #efa29c; --bad-wash: #402c2b; --warning: #e2c17c; --warning-wash: #3a3425; }
html[data-theme="dark"] .nav-link.active { color: var(--accent); }
html[data-theme="dark"] .course-card:hover { background: var(--surface-3); }

@media (max-width: 1100px) {
  :root { --side: 76px; }
  .sidebar { align-items: center; padding: 21px 9px 14px; }
  .brand { justify-content: center; margin: 0 0 25px; }
  .brand-name, .nav-heading, .nav-link > span:last-child, .sidebar-bottom { display: none; }
  .primary-nav { width: 100%; gap: 6px; }
  .nav-link { justify-content: center; min-height: 46px; padding: 0; }
  .nav-link.active::before { left: -9px; }
  .home-main-grid { grid-template-columns: minmax(0, 1.35fr) minmax(230px, .9fr); }
  .course-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .app-shell { padding-bottom: 0; }
  .sidebar { inset: auto 0 0; width: 100%; height: auto; min-height: 112px; padding: 5px 6px max(5px, env(safe-area-inset-bottom)); border-top: 1px solid var(--line); border-right: 0; background: var(--surface); }
  .brand, .nav-heading, .sidebar-bottom { display: none; }
  .primary-nav { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); grid-auto-rows: 48px; gap: 1px 3px; }
  .nav-link { display: flex; min-width: 0; min-height: 45px; flex-direction: column; justify-content: center; gap: 0; padding: 2px 1px; border-radius: 8px; font-size: 11px; }
  .nav-link > span:last-child { display: block; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .nav-link .nav-icon { width: 25px; height: 25px; flex-basis: 25px; padding: 4px; border-radius: 8px; }
  .nav-link.active::before { display: none; }
  .main-content { margin-left: 0; }
  .topbar { min-height: 57px; gap: 9px; padding: 0 15px; }
  .breadcrumb { gap: 6px; font-size: 12px; }
  .crumb-current, .search-box kbd { display: none; }
  .search-box { width: min(57vw, 260px); height: 37px; gap: 5px; padding: 0 8px; }
  .search-box input { font-size: 12px; }
  .top-icon { width: 35px; height: 35px; }
  .page-wrap { padding: 24px 16px calc(140px + env(safe-area-inset-bottom)); }
  .dashboard-intro { min-height: 0; align-items: flex-start; gap: 15px; padding: 20px 17px; }
  .welcome-copy h1 { font-size: 29px; }
  .welcome-desc { font-size: 13px; }
  .welcome-actions { margin-top: 16px; }
  .welcome-actions .button { min-height: 42px; }
  .today-stamp { width: 103px; flex-basis: 103px; gap: 5px; padding-left: 12px; }
  .today-stamp > span, .today-stamp small { font-size: 11px; }
  .today-stamp strong { font-size: 19px; }
  .home-main-grid, .lower-grid { grid-template-columns: 1fr; gap: 11px; margin-top: 12px; }
  .resume-panel, .daily-panel, .activity-panel, .planner-peek { padding: 16px; }
  .section-title-row { align-items: center; gap: 8px; }
  .section-title-row h2 { font-size: 17px; }
  .section-title-row p:not(.eyebrow) { font-size: 12px; }
  .text-button { min-height: 40px; font-size: 12px; white-space: nowrap; }
  .course-grid { grid-template-columns: 1fr; gap: 8px; }
  .course-card { min-height: 86px; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 9px; padding: 12px; }
  .course-symbol { width: 36px; height: 36px; }
  .course-card-copy strong { font-size: 13px; }
  .course-card-copy small { font-size: 12px; }
  .page-heading { margin-bottom: 22px; }
  .page-heading h1 { font-size: 28px; }
  .page-heading > p:last-child { font-size: 13px; }
  .course-summary { gap: 7px 15px; font-size: 12px; }
  .catalog-layout { grid-template-columns: 1fr; gap: 9px; }
  .catalog-tabs { display: flex; overflow-x: auto; gap: 5px; padding: 0 1px 6px; scrollbar-width: thin; }
  .catalog-tab { display: flex; min-width: max-content; min-height: 39px; gap: 6px; padding: 5px 10px; border: 1px solid var(--line); font-size: 12px; }
  .catalog-tab small { display: none; }
  .catalog-row { grid-template-columns: 28px minmax(0, 1fr) auto; gap: 8px; min-height: 63px; padding: 8px 10px; }
  .catalog-copy strong { font-size: 13px; }
  .catalog-state { font-size: 11px; }
  .lesson-media { grid-template-columns: 1fr; gap: 9px; }
  .lesson-media-sheet { grid-template-columns: 34px minmax(0, 1fr) auto; gap: 9px; }
  .lesson-media-sheet .button { grid-column: auto; width: auto; }
  .lesson-navigation { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px; }
  .lesson-navigation-current { grid-column: 1 / -1; grid-row: 1; text-align: center; }
  .lesson-nav-button { min-width: 0; min-height: 55px; padding: 7px 9px; font-size: 12px; }
  .lesson-nav-button strong { font-size: 12px; }
  .lesson-heading h1 { font-size: 27px; }
  .setup-paper, .exam-intro, .quiz-stage, .result-panel { padding: 16px; }
  .setup-grid { grid-template-columns: 1fr; gap: 12px; }
  .exam-intro { grid-template-columns: 1fr; gap: 17px; }
  .exam-controls { max-width: none; }
  .exam-layout { grid-template-columns: 1fr; gap: 10px; }
  .exam-rail { padding: 13px; }
  .exam-rail > p, .exam-legend { display: none; }
  .exam-question-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); margin-top: 10px; }
  .exam-actions { gap: 5px; }
  .exam-actions > span { display: none; }
  .exam-actions .button { flex: 1 1 calc(33% - 5px); padding: 7px 7px; font-size: 12px; }
  .quiz-stage-head { gap: 9px; }
  .quiz-stage-head > span:first-child { font-size: 12px; }
  .quiz-question { margin: 18px 0 13px; font-size: 18px; }
  .quiz-stage-footer { align-items: flex-start; }
  .quiz-feedback { max-width: 48%; font-size: 12px; }
  .formula-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; }
  .formula-stat { padding: 10px 11px; }
  .formula-stat span { font-size: 12px; }
  .formula-stat strong { font-size: 21px; }
  .formula-workspace { grid-template-columns: 1fr; gap: 16px; padding: 15px; }
  .formula-filters { gap: 10px; }
  .formula-mode-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; }
  .mode-option { padding: 7px 5px; }
  .mode-option strong { font-size: 12px; }
  .mode-option small { font-size: 11px; }
  .formula-start { padding: 16px; }
  .formula-preview { grid-template-columns: 1fr; }
  .record-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .record-summary > div { padding: 12px; }
  .record-summary > div:nth-child(2) { border-right: 0; }
  .record-summary > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .record-summary strong { font-size: 22px; }
  #formula-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-progress, .module-records { grid-template-columns: 1fr; }
  .score-row { grid-template-columns: 76px minmax(0, 1fr) 45px; gap: 6px; padding: 8px 2px; }
  .score-row strong, .score-value { font-size: 12px; }
  .planner-heading { align-items: flex-start; }
  .planner-heading > .button { min-height: 40px; padding: 7px 10px; font-size: 12px; }
  .planner-layout { grid-template-columns: 1fr; gap: 11px; }
  .planner-week, .planner-tasks { padding: 14px; }
  .week-grid { gap: 2px; }
  .week-day { min-height: 76px; padding: 7px 1px; }
  .week-day small { font-size: 10px; }
  .settings-group { grid-template-columns: 1fr; gap: 8px; }
  .settings-group > div:first-child { grid-row: auto; margin-bottom: 4px; }
  .settings-group > input { grid-column: 1; }
  .danger-zone { align-items: start; }
  .footer-local { display: none; }
  .mascot { right: 8px; bottom: calc(118px + env(safe-area-inset-bottom)); }
  .mascot-face { width: 68px; height: 130px; flex-basis: 68px; border-radius: 20px; }
  .mascot-bubble { max-width: min(210px, calc(100vw - 24px)); }
  .toast { right: 10px; bottom: 124px; left: 10px; width: auto; max-width: none; text-align: center; }
}
@media (max-width: 380px) {
  .topbar { padding: 0 10px; }
  .page-wrap { padding-right: 12px; padding-left: 12px; }
  .dashboard-intro { gap: 9px; padding: 16px 12px; }
  .today-stamp { width: 86px; flex-basis: 86px; padding-left: 9px; }
  .welcome-copy h1 { font-size: 25px; }
  .welcome-actions { gap: 6px; }
  .welcome-actions .button { padding-right: 10px; padding-left: 10px; font-size: 12px; }
  .catalog-state { max-width: 48px; text-align: right; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}