:root {
  color-scheme: light;
  --bg: #f6f8fa;
  --surface: #ffffff;
  --surface-soft: #f6f8fa;
  --text: #1f2328;
  --muted: #656d76;
  --line: #d0d7de;
  --accent: #0969da;
  --accent-strong: #0969da;
  --accent-soft: #ddf4ff;
  --shadow: 0 16px 48px rgba(31,35,40,.07);
  --sidebar: #0d1117;
  --sidebar-text: #e6edf3;
  --hero: #0d1117;
  --input: #fff;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1117;
  --surface: #161b22;
  --surface-soft: #0d1117;
  --text: #e6edf3;
  --muted: #8b949e;
  --line: #30363d;
  --accent: #58a6ff;
  --accent-strong: #58a6ff;
  --accent-soft: #11243b;
  --shadow: 0 18px 56px rgba(0, 0, 0, .18);
  --sidebar: #0d1117;
  --sidebar-text: #e6edf3;
  --hero: #0d1117;
  --input: #0d1117;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; transition: background .25s, color .25s; }
button, input, textarea, select { font: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
::selection { background: #58a6ff; color: #0d1117; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 244px minmax(0,1fr); }
.sidebar { background: var(--sidebar); color: var(--sidebar-text); min-height: 100vh; padding: 28px 18px 22px; display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; z-index: 20; }
.brand { display: flex; align-items: center; gap: 12px; padding: 1px 8px 34px; color: #fff; }
.brand-logo { display: block; width: 52px; height: 52px; flex: 0 0 52px; object-fit: contain; }
.brand-symbol { width: 39px; height: 39px; border-radius: 12px; flex: 0 0 39px; display: flex; align-items: center; justify-content: center; gap: 3px; background: linear-gradient(145deg,#58a6ff,#238636); box-shadow: 0 8px 22px rgba(88,166,255,.22); transform: rotate(-5deg); }
.brand-symbol span { display: block; width: 4px; height: 15px; border-radius: 4px; background: #0d1117; transform: rotate(25deg); }
.brand-symbol span:nth-child(2) { height: 22px; }
.brand-copy { display: grid; line-height: 1.04; }
.brand-copy strong { font-size: 19px; letter-spacing: -.045em; font-weight: 800; }
.brand-copy small { font-size: 9px; letter-spacing: .33em; color: #58a6ff; margin-top: 6px; font-weight: 800; }
.sidebar-caption { font-size: 9px; font-weight: 800; color: #8b949e; letter-spacing: .17em; padding: 0 15px; margin: 10px 0 12px; }
.sidebar-nav { display: grid; gap: 5px; }
.nav-link { display: flex; align-items: center; gap: 12px; padding: 12px 14px; min-height: 47px; border-radius: 11px; color: #8b949e; font-size: 13px; font-weight: 650; transition: background .2s, color .2s, transform .2s; }
.nav-link:hover { color: #fff; background: rgba(255,255,255,.065); transform: translateX(2px); }
.nav-link.active { color: #79b8ff; background: rgba(88,166,255,.13); box-shadow: inset 3px 0 0 #58a6ff; }
.nav-icon { font-size: 20px; width: 22px; text-align: center; line-height: 1; font-weight: 400; }
.sidebar-bottom { margin-top: auto; }
.sidebar-note { display: flex; gap: 10px; padding: 17px 10px 19px; border-bottom: 1px solid rgba(255,255,255,.09); color: #e6edf3; font-size: 11px; line-height: 1.55; }
.sidebar-note small { color: #8b949e; }
.pulse-dot { width: 8px; height: 8px; flex: 0 0 8px; display: inline-block; border-radius: 50%; background: #2ea043; box-shadow: 0 0 0 4px rgba(46,160,67,.14); margin-top: .42em; }
.sidebar-user { display: flex; align-items: center; gap: 10px; padding: 17px 7px 0; min-width: 0; }
.sidebar-user > span:last-child { min-width: 0; display: grid; }
.sidebar-user strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; color: #fff; }
.sidebar-user small { font-size: 10px; color: #8b949e; }
.avatar { width: 34px; height: 34px; flex: 0 0 34px; display: grid; place-items: center; border-radius: 10px; background: #58a6ff; color: #0d1117; font-size: 12px; font-weight: 850; }
.avatar.soft { width: 39px; height: 39px; flex-basis: 39px; background: var(--accent-soft); color: var(--accent-strong); }
.avatar-photo { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: inherit; }
.main-column { min-width: 0; display: flex; flex-direction: column; }
.topbar { height: 73px; flex: 0 0 73px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 clamp(24px,4vw,66px); border-bottom: 1px solid var(--line); background: var(--surface); }
.topbar-path { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: 12px; font-weight: 700; white-space: nowrap; }
.path-root { font-size: 10px; font-weight: 850; letter-spacing: .18em; color: var(--accent-strong); }
.path-divider { color: #8b949e; }
.topbar-actions { display: flex; align-items: center; gap: 15px; }
.language-switch { display: inline-flex; align-items: center; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-soft); }
.language-switch button { min-width: 34px; min-height: 29px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); font-size: 11px; font-weight: 800; line-height: 1; }
.language-switch button:hover { color: var(--text); }
.language-switch button.active { color: #fff; background: var(--accent-strong); }
.login-top-actions { display: flex; align-items: center; gap: 9px; }
.topbar-badge { display: inline-flex; gap: 9px; align-items: center; color: var(--muted); font-size: 11px; font-weight: 700; }
.topbar-badge .pulse-dot { margin: 0; width: 6px; height: 6px; flex-basis: 6px; }
.icon-button { width: 37px; height: 37px; display: grid; place-items: center; border-radius: 10px; border: 1px solid var(--line); color: var(--text); background: var(--surface-soft); font-size: 18px; transition: transform .2s, border-color .2s, background .2s; }
.icon-button:hover { transform: translateY(-2px); border-color: var(--accent); }
.text-button { border: 0; background: none; color: var(--muted); font-weight: 700; font-size: 12px; }
.text-button:hover { color: var(--accent-strong); }
.mobile-menu { display: none; }
.page-content { width: min(100%, 1430px); margin: 0 auto; padding: 39px clamp(24px,4vw,66px) 68px; flex: 1; animation: page-in .5s ease both; }
.page-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 22px; margin-bottom: 30px; }
.heading-actions { display: flex; gap: 9px; flex-wrap: wrap; }
.page-heading h1 { font-size: clamp(29px,3.2vw,45px); letter-spacing: -.055em; line-height: 1.14; margin: 8px 0 9px; font-weight: 800; }
.page-heading p { color: var(--muted); margin: 0; font-size: 13px; max-width: 650px; }
.eyebrow { display: block; color: var(--accent-strong); font-size: 10px; font-weight: 850; letter-spacing: .2em; }
.accent-dot { color: var(--accent); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 43px; padding: 0 19px; border-radius: 10px; font-size: 12px; font-weight: 800; border: 1px solid transparent; white-space: nowrap; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover { transform: translateY(-2px); box-shadow: 0 9px 20px rgba(20,62,58,.1); }
.button-primary { color: #fff; background: #0969da; }
.button-primary:hover { background: #1f7cf0; }
html[data-theme="dark"] .button-primary { background: #2381ea; color: #fff; }
html[data-theme="dark"] .button-primary:hover { background: #388bfd; }
.button-outline { border-color: var(--line); background: var(--surface); color: var(--text); }
.button-secondary { color: var(--accent-strong); background: var(--accent-soft); }
.button-light { color: #0d1117; background: #ddf4ff; }
.button-ghost { color: var(--muted); background: transparent; }
.button-wide { width: 100%; justify-content: space-between; min-height: 52px; }
.hero-panel { background: radial-gradient(circle at 82% 26%,rgba(31,111,235,.24),transparent 31%),linear-gradient(125deg,#161b22,#0d1117 67%,#11243b); border-radius: 22px; min-height: 298px; overflow: hidden; display: grid; grid-template-columns: 1.15fr .85fr; position: relative; color: #e6edf3; box-shadow: 0 22px 50px rgba(0,0,0,.16); }
.hero-panel.compact { min-height: 260px; }
.hero-copy { padding: 34px 0 35px clamp(32px,3.5vw,57px); z-index: 2; }
.hero-label { display: inline-flex; align-items: center; gap: 10px; font-size: 10px; font-weight: 800; letter-spacing: .16em; color: #79b8ff; }
.hero-label .pulse-dot { margin: 0; }
.hero-copy h2 { font-size: clamp(30px,3vw,45px); line-height: 1.12; letter-spacing: -.05em; margin: 20px 0 12px; font-weight: 770; }
.hero-copy h2 em { font-style: normal; color: #58a6ff; }
.hero-copy p { color: #aab4c0; font-size: 13px; line-height: 1.7; max-width: 450px; margin: 0 0 24px; }
.hero-art { min-height: 260px; position: relative; }
.orbit { position: absolute; width: 288px; height: 288px; border: 1px solid rgba(142,241,204,.17); border-radius: 50%; left: 50%; top: 50%; transform: translate(-50%,-50%) rotate(0deg); }
.orbit::before { content: ''; position: absolute; width: 8px; height: 8px; border-radius: 50%; background: #58a6ff; top: 22px; left: 58px; box-shadow: 0 0 16px rgba(88,166,255,.7); }
.orbit-a { animation: orbit 22s linear infinite; }
.orbit-b { width: 205px; height: 205px; border-style: dashed; animation: orbit-reverse 28s linear infinite; }
.orbit-b::before { top: 40px; left: 12px; width: 5px; height: 5px; }
.hero-core { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%) rotate(-8deg); width: 131px; height: 131px; border-radius: 32px; display: grid; align-content: end; justify-items: center; padding-bottom: 15px; background: #161b22 url("../img/hiveops-logo.9d6c552a1dce.png") center 21px / 74px no-repeat; border: 1px solid #30363d; color: #e6edf3; box-shadow: 0 20px 48px rgba(0,0,0,.24),0 0 0 10px rgba(88,166,255,.05); }
.hero-core span { display: none; }
.hero-core small { font-size: 8px; font-weight: 900; letter-spacing: .24em; }
.floating-tag { position: absolute; padding: 7px 11px; border: 1px solid rgba(88,166,255,.3); border-radius: 6px; background: rgba(13,17,23,.65); color: #79b8ff; font-size: 8px; font-weight: 800; letter-spacing: .13em; animation: float 5s ease-in-out infinite; }
.tag-one { left: 15%; top: 18%; }.tag-two { right: 8%; top: 34%; animation-delay: -2s; }.tag-three { left: 13%; bottom: 17%; animation-delay: -3s; }
.metric-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 17px; margin: 22px 0 31px; }
.metric-card { min-height: 150px; padding: 18px 21px; display: flex; flex-direction: column; align-items: flex-start; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); transition: transform .2s, border-color .2s; }
.metric-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.metric-icon { width: 31px; height: 31px; border-radius: 8px; display: grid; place-items: center; font-size: 18px; line-height: 1; margin-bottom: 8px; }
.metric-icon.cyan { color: #0969da; background: #ddf4ff; }.metric-icon.violet { color: #7e76ce; background: #eeecfc; }.metric-icon.amber { color: #cb8b3b; background: #fff3df; }.metric-icon.green { color: #238636; background: #dafbe1; }
.metric-label { font-size: 11px; color: var(--muted); font-weight: 700; }
.metric-card strong { font-size: 30px; letter-spacing: -.06em; line-height: 1.15; margin: 3px 0 1px; }
.metric-card small { color: var(--muted); font-size: 10px; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.surface-card { background: var(--surface); border: 1px solid var(--line); border-radius: 17px; box-shadow: var(--shadow); padding: 23px; min-width: 0; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 17px; }
.section-heading h2 { font-size: 19px; letter-spacing: -.035em; margin: 4px 0 0; }
.section-heading.page-section { margin: 34px 0 16px; }
.subtle-link { color: var(--accent-strong); font-size: 11px; font-weight: 800; white-space: nowrap; }
.subtle-link:hover { text-decoration: underline; }
.list-stack { display: grid; }
.list-row { display: flex; align-items: center; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line); min-width: 0; transition: transform .2s; }
a.list-row:hover { transform: translateX(4px); }
.row-icon { width: 36px; height: 36px; border-radius: 10px; flex: 0 0 36px; display: grid; place-items: center; color: #8e7bd2; background: #f0ecfc; font-size: 17px; font-weight: 700; }
.row-icon.accent { color: var(--accent-strong); background: var(--accent-soft); }
.row-main { min-width: 0; display: grid; gap: 1px; flex: 1; }
.row-main strong { font-size: 12px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-main small { font-size: 10px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-meta { font-size: 10px; color: var(--muted); white-space: nowrap; }
.row-arrow { color: var(--accent-strong); font-size: 14px; font-weight: 750; white-space: nowrap; }
.empty-state { display: flex; align-items: flex-start; flex-direction: column; justify-content: center; min-height: 210px; padding: 16px 4px 5px; }
.empty-state.large { min-height: 305px; align-items: center; text-align: center; }
.empty-symbol { width: 43px; height: 43px; border-radius: 13px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-strong); font-size: 24px; margin-bottom: 13px; }
.empty-state h3 { font-size: 15px; letter-spacing: -.02em; margin: 0 0 5px; }
.empty-state p { margin: 0 0 18px; color: var(--muted); font-size: 11px; line-height: 1.65; max-width: 320px; }
.footer { display: flex; justify-content: space-between; padding: 18px clamp(24px,4vw,66px) 24px; color: var(--muted); font-size: 9px; letter-spacing: .14em; }
.footer span:first-child { color: var(--accent-strong); font-weight: 900; }
.message-stack { margin-bottom: 17px; }.notice { background: var(--accent-soft); color: var(--accent-strong); border: 1px solid rgba(59,199,155,.24); padding: 12px 15px; border-radius: 10px; font-size: 12px; font-weight: 650; }
.course-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 19px; }
.course-card { min-height: 232px; display: flex; flex-direction: column; padding: 21px; border-radius: 17px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); transition: transform .2s,border-color .2s,box-shadow .2s; }
.course-cover-thumb { display: block; width: calc(100% + 42px); height: 135px; margin: -21px -21px 17px; object-fit: cover; border-radius: 17px 17px 0 0; }
.course-cover-hero { display: block; width: 100%; height: clamp(170px,23vw,300px); object-fit: cover; border-radius: 18px; margin-bottom: 22px; box-shadow: var(--shadow); }
.course-card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: 0 22px 45px rgba(17,77,68,.12); }
.course-card-top { display: flex; align-items: center; justify-content: space-between; }
.course-glyph { width: 41px; height: 41px; border-radius: 12px; display: grid; place-items: center; font-size: 21px; color: var(--accent-strong); background: var(--accent-soft); }
.course-card h3 { font-size: 19px; letter-spacing: -.04em; margin: 18px 0 5px; line-height: 1.25; }
.course-card p { font-size: 11px; color: var(--muted); margin: 0 0 24px; line-height: 1.6; }
.course-card-bottom { display: flex; justify-content: space-between; align-items: center; gap: 10px; border-top: 1px solid var(--line); padding-top: 13px; margin-top: auto; font-size: 10px; color: var(--muted); }
.course-card-bottom strong { color: var(--accent-strong); font-size: 11px; }
.catalog-card { min-height: 0; }
.catalog-classes { display: grid; gap: 10px; margin-top: 16px; }
.catalog-class { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 12px; }
.catalog-class span { overflow-wrap: anywhere; }
.catalog-class .button { flex: none; }
@media (max-width: 420px) { .catalog-class { align-items: stretch; flex-direction: column; } }
.status-pill { display: inline-flex; align-items: center; border-radius: 99px; padding: 6px 10px; background: var(--accent-soft); color: var(--accent-strong); font-size: 10px; font-weight: 800; white-space: nowrap; }
.progress-track { display: block; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: auto; }
.progress-track > span { display: block; height: 100%; width: var(--progress,0%); border-radius: inherit; background: linear-gradient(90deg,#0969da,#58a6ff); transition: width .5s; }
.progress-track.small { width: 110px; height: 5px; margin-top: 5px; }
.back-link { display: inline-block; color: var(--muted); font-size: 11px; font-weight: 750; margin-bottom: 18px; }
.back-link:hover { color: var(--accent-strong); }
.detail-layout { grid-template-columns: 1.3fr .8fr; }
.module-block + .module-block { margin-top: 20px; }
.module-heading { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }.module-index,.step-number { color: var(--accent-strong); background: var(--accent-soft); border-radius: 8px; padding: 5px 8px; font-size: 10px; font-weight: 850; }
.module-heading h3 { font-size: 14px; margin: 0; }
.course-order-actions { display: inline-flex; flex: none; gap: 4px; margin-left: auto; }
.course-order-actions button { width: 28px; height: 28px; padding: 0; border: 1px solid var(--line); border-radius: 7px; color: var(--text); background: var(--surface); cursor: pointer; font-size: 15px; line-height: 1; }
.course-order-actions button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-strong); background: var(--accent-soft); }
.course-order-actions button:disabled { opacity: .35; cursor: default; }
.module-block .list-row .course-order-actions { margin-left: 0; }
@media (max-width: 650px) { .module-block .list-row { flex-wrap: wrap; }.module-block .list-row .row-main { flex-basis: calc(100% - 48px); }.module-block .list-row .course-order-actions { margin-left: 45px; } }
.mini-empty { color: var(--muted); font-size: 11px; padding: 12px 0; }
.card-footer-note { border-top: 1px solid var(--line); margin-top: 19px; padding-top: 15px; font-size: 10px; color: var(--muted); }
.section-count { font-size: 10px; color: var(--muted); }
.student-row { display: flex; align-items: center; gap: 14px; border-top: 1px solid var(--line); padding: 17px 0; transition: transform .2s; }.student-row:hover { transform: translateX(3px); }
.student-progress { min-width: 115px; font-size: 10px; color: var(--muted); }
.progress-row { display: flex; gap: 12px; align-items: center; padding: 14px 0; border-top: 1px solid var(--line); }
.inline-form { display: flex; align-items: center; gap: 7px; }.compact-select { background: var(--input); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 7px 8px; font-size: 10px; }
.mini-button { border: 1px solid var(--line); background: var(--surface-soft); color: var(--text); border-radius: 8px; padding: 7px 10px; font-size: 10px; font-weight: 700; }.mini-button:hover { border-color: var(--accent); }
.lesson-row { padding: 17px 0; }.lesson-content { max-width: 850px; }.lesson-meta { display: flex; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 9px; font-weight: 800; letter-spacing: .1em; }.lesson-body { padding: 13px 0 4px; font-size: 14px; line-height: 1.8; overflow-wrap: anywhere; }.lesson-body p { margin: 12px 0; }
.lesson-blocks { display: grid; gap: 22px; padding-top: 20px; font-size: 14px; line-height: 1.8; overflow-wrap: anywhere; }
.lesson-block-heading { margin: 8px 0 -12px; font-size: 23px; letter-spacing: -.035em; }
.lesson-block-paragraph p,.lesson-rich-html p { margin: 0 0 12px; }
.lesson-rich-html :is(h2,h3) { margin: 10px 0; letter-spacing: -.025em; }
.lesson-rich-html a { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; }
.lesson-rich-html :is(ul,ol) { padding-left: 26px; }
.lesson-code { overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.lesson-code-label { padding: 8px 15px; border-bottom: 1px solid var(--line); color: var(--accent-strong); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.lesson-code pre { margin: 0; padding: 17px; overflow: auto; color: var(--text); font: 13px/1.6 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: pre; }
.lesson-figure { margin: 0; }
.lesson-figure img { display: block; max-width: 100%; height: auto; max-height: 620px; border: 1px solid var(--line); border-radius: 12px; }
.lesson-figure figcaption { padding-top: 8px; color: var(--muted); font-size: 11px; }
.lesson-block-subheading { margin: 8px 0 -8px; font-size: 1.45em; line-height: 1.35; letter-spacing: -.025em; }
.lesson-font-serif { font-family: Georgia, Cambria, 'Times New Roman', serif; }.lesson-font-mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.lesson-font-display { font-family: 'Trebuchet MS', 'Avenir Next', Verdana, sans-serif; }.lesson-font-humanist { font-family: 'Segoe UI', Calibri, Optima, sans-serif; }
.lesson-blocks .lesson-text-xs { font-size: .75em; }.lesson-blocks .lesson-text-xl { font-size: 1.35em; }.lesson-blocks .lesson-text-xxl { font-size: 1.6em; }
.lesson-blocks .lesson-text-small { font-size: .88em; }.lesson-blocks .lesson-text-large { font-size: 1.18em; }
.lesson-blocks .lesson-block-subheading.lesson-text-small { font-size: 1.2em; }.lesson-blocks .lesson-block-subheading.lesson-text-large { font-size: 1.7em; }
.lesson-block-subsection { font-size: 1.2em; }.lesson-blocks .lesson-block-subheading.lesson-text-xs { font-size: 1em; }.lesson-blocks .lesson-block-subheading.lesson-text-xl { font-size: 2em; }.lesson-blocks .lesson-block-subheading.lesson-text-xxl { font-size: 2.25em; }
.lesson-figure.lesson-image-small { max-width: 320px; }.lesson-figure.lesson-image-medium { max-width: 560px; }.lesson-figure.lesson-image-large { max-width: 800px; }.lesson-figure.lesson-image-full { width: 100%; }
.lesson-figure[style] { max-width: min(100%, var(--lesson-image-width)); width: 100%; }
.lesson-figure.lesson-align-center { margin-inline: auto; }.lesson-figure.lesson-align-right { margin-left: auto; }
.lesson-figure img { width: 100%; object-fit: contain; }
.lesson-quote { margin: 0; padding: 8px 18px; border-left: 3px solid var(--accent); color: var(--muted); font-style: italic; }
.lesson-callout { padding: 16px 18px; border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; background: var(--accent-soft); }
.lesson-file { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.lesson-file .button { max-width: 100%; }
.lesson-file small { max-width: 100%; color: var(--muted); overflow-wrap: anywhere; }
.activity-filters { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)) auto auto; align-items: end; gap: 10px; }
.activity-row .row-main small { white-space: normal; }
@media (max-width: 1100px) { .activity-filters { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media (max-width: 560px) { .activity-filters { grid-template-columns: 1fr; }.activity-row { flex-wrap: wrap; }.activity-row .row-meta { margin-left: 48px; } }
.section-gap { margin-top: 20px; }.support-text { color: var(--muted); font-size: 12px; line-height: 1.7; overflow-wrap: anywhere; }.practice-box { margin-top: 20px; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }.practice-box h2 { margin: 6px 0 10px; font-size: 18px; }.evidence-item { align-items: flex-start; }.evidence-item .row-main small { white-space: normal; overflow-wrap: anywhere; }.evidence-item .support-text { margin-top: 5px; }
.history-stack { display: grid; gap: 18px; max-width: 900px; }.history-stack details { margin-top: 14px; }.history-stack summary { cursor: pointer; color: var(--accent-strong); font-size: 12px; font-weight: 800; }.revision-diff { padding: 15px; border-radius: 10px; background: var(--surface-soft); border: 1px solid var(--line); font-size: 11px; line-height: 1.6; max-height: 360px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; }
.form-layout { max-width: 720px; }.form-card { padding: 28px; }.stack-form { display: grid; gap: 18px; }.field { display: grid; gap: 6px; }.field label { font-size: 11px; color: var(--text); font-weight: 800; }.field input,.field textarea,.field select,.form-control { display: block; width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--input); color: var(--text); font-size: 12px; outline: none; transition: border-color .2s, box-shadow .2s; }.field input:focus,.field textarea:focus,.field select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(88,166,255,.12); }.field textarea { resize: vertical; }.field-help,.field-error { font-size: 10px; color: var(--muted); }.field-error { color: #c55562; }.form-error { padding: 10px 12px; background: #fff0f1; color: #ae3e4e; border-radius: 8px; font-size: 11px; }.form-actions { display: flex; gap: 10px; margin-top: 7px; }
.field input[type=checkbox] { width: 18px; height: 18px; padding: 0; accent-color: var(--accent); }
.field input[type=file] { padding: 9px; }.field input[type=file]::file-selector-button { border: 0; border-radius: 7px; padding: 8px 11px; margin-right: 10px; background: var(--accent-soft); color: var(--accent-strong); font-weight: 750; cursor: pointer; }.list-search { display: flex; gap: 10px; margin-bottom: 15px; }.list-search input { min-width: 0; flex: 1; }
.student-id-card { min-width: 205px; max-width: 250px; padding: 15px 17px; border-radius: 14px; background: var(--accent-soft); border: 1px solid var(--line); display: grid; gap: 4px; }
.field-help { line-height: 1.55; }
.field-help ul { margin: 3px 0 0; padding-left: 17px; }
.field-help li + li { margin-top: 3px; }
.select-picker { position: relative; min-width: 0; }
.field select.select-picker-native { position: absolute; width: 1px; height: 1px; padding: 0; opacity: 0; pointer-events: none; }
.select-picker-trigger { width: 100%; min-height: 42px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 13px; border: 1px solid var(--line); border-radius: 9px; background: var(--input); color: var(--text); text-align: left; cursor: pointer; }
.select-picker-trigger:hover,.select-picker-trigger:focus-visible { border-color: var(--accent); outline: 3px solid var(--accent-soft); }
.select-picker-trigger span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.select-picker-panel { position: absolute; top: calc(100% + 5px); left: 0; right: 0; z-index: 30; padding: 8px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }
.select-picker-panel[hidden] { display: none; }
.select-picker-search { width: 100%; padding: 10px 11px; margin-bottom: 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--input); color: var(--text); }
.select-picker-options { max-height: 240px; overflow: auto; display: grid; gap: 3px; }
.select-picker-option { padding: 10px 11px; border: 0; border-radius: 7px; background: transparent; color: var(--text); text-align: left; cursor: pointer; }
.select-picker-option:hover,.select-picker-option:focus-visible,.select-picker-option[aria-selected=true] { background: var(--accent-soft); color: var(--accent-strong); outline: none; }
.select-picker-empty { margin: 8px; color: var(--muted); font-size: 12px; }
.assignment-choice { display: grid; align-content: start; gap: 12px; }
.assignment-choice h2,.assignment-choice p { margin: 0; }
.assignment-choice p { color: var(--muted); font-size: 13px; line-height: 1.65; }
.assignment-choice .button { justify-self: start; margin-top: 8px; }
.assignment-instructor { display: flex; align-items: center; gap: 12px; padding: 13px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface-soft); }
.assignment-instructor strong,.assignment-instructor small { display: block; }
.assignment-instructor small { color: var(--muted); font-size: 11px; }
.student-id-card span { color: var(--accent-strong); font-size: 9px; font-weight: 900; letter-spacing: .14em; }
.student-id-card strong { font-size: 27px; letter-spacing: -.05em; line-height: 1.15; }
.student-id-card small { color: var(--muted); font-size: 10px; line-height: 1.45; }
.invitation-row { flex-wrap: wrap; }
.invitation-row .row-main small { white-space: normal; }
.invitation-actions { display: flex; gap: 7px; flex-wrap: wrap; }
.invitation-actions .button { min-height: 36px; padding: 0 12px; }
.form-actions { flex-wrap: wrap; }
.login-body { min-height: 100vh; }.login-shell { min-height: 100vh; display: grid; grid-template-columns: minmax(0,1fr) minmax(430px,.93fr); }.login-feature { overflow: hidden; position: relative; color: #fff; background: radial-gradient(circle at 73% 48%,rgba(35,134,54,.22),transparent 31%),linear-gradient(135deg,#161b22,#0d1117 72%); }.login-feature-inner { min-height: 100vh; display: flex; flex-direction: column; padding: 38px clamp(34px,6vw,96px) 35px; position: relative; z-index: 2; }.login-brand { display: flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 850; letter-spacing: -.05em; }.login-brand em { color: #58a6ff; font-style: normal; }.feature-content { margin: auto 0; max-width: 540px; }.eyebrow.light { color: #58a6ff; }.feature-content h1 { font-size: clamp(48px,5.5vw,80px); letter-spacing: -.075em; line-height: 1.02; margin: 20px 0 24px; font-weight: 830; }.feature-content p { color: #8b949e; font-size: 15px; line-height: 1.8; max-width: 410px; }.feature-footer { display: flex; gap: 28px; font-size: 9px; font-weight: 800; letter-spacing: .16em; color: #8b949e; }.login-glow { position: absolute; width: 680px; height: 680px; border: 1px solid rgba(88,166,255,.13); border-radius: 50%; left: 50%; top: 50%; transform: translate(-50%,-50%); box-shadow: 0 0 0 75px rgba(88,166,255,.025),0 0 0 160px rgba(88,166,255,.025); }.feature-orbit { position: absolute; width: 460px; height: 460px; left: 52%; top: 42%; border: 1px dashed rgba(88,166,255,.18); border-radius: 50%; animation: orbit 50s linear infinite; }.orbit-two { width: 300px; height: 300px; left: 60%; top: 50%; animation-direction: reverse; }.login-form-side { padding: 38px clamp(30px,6vw,105px) 28px; display: flex; flex-direction: column; }.login-top { display: flex; justify-content: space-between; align-items: center; font-size: 10px; font-weight: 800; letter-spacing: .2em; color: var(--muted); }.login-card { width: min(100%,390px); margin: auto; }.login-kicker { display: flex; align-items: center; gap: 10px; color: var(--accent-strong); font-size: 11px; font-weight: 800; }.login-kicker .pulse-dot { margin: 0; }.login-card h2 { font-size: clamp(31px,3vw,41px); letter-spacing: -.06em; line-height: 1.14; margin: 15px 0 10px; }.login-card > p { color: var(--muted); font-size: 13px; margin: 0 0 31px; }.login-card .stack-form { gap: 20px; }.login-card .field label { font-size: 12px; }.login-card .field input { min-height: 49px; }.login-help { border-top: 1px solid var(--line); margin-top: 31px; padding-top: 20px; color: var(--muted); font-size: 11px; }.login-bottom { color: var(--muted); font-size: 9px; font-weight: 800; letter-spacing: .13em; }.login-bottom span { color: var(--accent); margin: 0 8px; }
.login-feature { background: radial-gradient(circle at 73% 48%,rgba(31,111,235,.25),transparent 31%),linear-gradient(135deg,#161b22,#0d1117 72%); }
.login-brand em,.eyebrow.light { color: #58a6ff; }
.login-brand .brand-logo { width: 72px; height: 72px; flex-basis: 72px; }
.feature-content p,.feature-footer { color: #aab4c0; }
.login-glow { border-color: rgba(88,166,255,.12); box-shadow: 0 0 0 75px rgba(88,166,255,.025),0 0 0 160px rgba(88,166,255,.025); }
.feature-orbit { border-color: rgba(88,166,255,.18); }
.nav-link { color: #aab4c0; }
.sidebar-caption,.sidebar-user small,.sidebar-note small { color: #8b949e; }
.sidebar-note { color: #e6edf3; }
.avatar { background: #11243b; color: #58a6ff; }
html[data-theme="dark"] .metric-icon.cyan,html[data-theme="dark"] .metric-icon.violet,html[data-theme="dark"] .metric-icon.amber,html[data-theme="dark"] .metric-icon.green,html[data-theme="dark"] .row-icon { background: #11243b; color: #79b8ff; }
@keyframes page-in { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: translateY(0); } }
@keyframes orbit { from { transform: translate(-50%,-50%) rotate(0); } to { transform: translate(-50%,-50%) rotate(360deg); } }
@keyframes orbit-reverse { from { transform: translate(-50%,-50%) rotate(360deg); } to { transform: translate(-50%,-50%) rotate(0); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@media (max-width: 1100px) { .course-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }.metric-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }.hero-art { opacity: .75; }.topbar-badge { display: none; } }
@media (max-width: 800px) { .app-shell { grid-template-columns: 1fr; }.sidebar { position: fixed; left: 0; top: 0; width: 244px; transform: translateX(-110%); transition: transform .25s; box-shadow: 15px 0 40px rgba(0,0,0,.13); }.menu-open .sidebar { transform: translateX(0); }.mobile-menu { display: grid; }.topbar { padding: 0 22px; }.topbar-path { flex: 1; }.two-column,.detail-layout { grid-template-columns: 1fr; }.login-shell { grid-template-columns: 1fr; }.login-feature { min-height: 300px; }.login-feature-inner { min-height: 300px; padding: 24px 30px; }.feature-content { margin: auto 0; }.feature-content h1 { font-size: 42px; margin: 14px 0 10px; }.feature-content p { font-size: 12px; }.feature-footer { display: none; }.login-form-side { min-height: 480px; padding: 24px 30px; }.login-card { padding: 35px 0; } }
@media (max-width: 560px) { .page-content { padding: 27px 19px 45px; }.page-heading { align-items: flex-start; flex-direction: column; gap: 15px; }.page-heading h1 { font-size: 32px; }.hero-panel { grid-template-columns: 1fr; min-height: auto; }.hero-copy { padding: 28px 25px 30px; }.hero-copy h2 { font-size: 32px; }.hero-art { display: none; }.metric-grid { gap: 10px; }.metric-card { min-height: 135px; padding: 14px; }.course-grid { grid-template-columns: 1fr; }.surface-card { padding: 18px; }.topbar-path .path-root,.path-divider { display: none; }.topbar-actions { gap: 7px; }.logout-button { font-size: 0; }.logout-button span { font-size: 17px; }.footer { padding: 17px 19px; }.footer span:last-child { display: none; }.progress-row { align-items: flex-start; flex-wrap: wrap; }.progress-row .row-main { flex-basis: calc(100% - 55px); }.inline-form { padding-left: 42px; }.student-progress { display: none; }.feature-content h1 { font-size: 34px; }.login-feature { min-height: 255px; }.login-feature-inner { min-height: 255px; } }
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; } }

/* Spacious course reader and personal progress views. */
.page-content:has(.reader-layout) { width: min(100%, 1650px); padding-inline: clamp(22px, 3vw, 52px); }
.reader-intro { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; margin: 18px 0 24px; }
.reader-intro h1 { margin: 9px 0 10px; font-size: clamp(35px, 3.6vw, 58px); line-height: 1.08; letter-spacing: -.058em; }
.reader-intro p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.65; max-width: 78ch; }
.reader-progress { padding: 18px 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); margin-bottom: 24px; }
.reader-progress-label { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 5px 18px; margin-bottom: 13px; font-size: 12px; }
.reader-progress-label span { color: var(--muted); }
.reader-track { height: 8px; }
.reader-layout { display: grid; grid-template-columns: 205px minmax(0,1fr); gap: 22px; align-items: start; }
.reader-sidebar { display: grid; gap: 15px; position: sticky; top: 20px; }
.reader-side-card { padding: 18px 14px; border: 1px solid var(--line); border-radius: 15px; background: var(--surface); }
.reader-side-card .eyebrow { padding-left: 8px; margin-bottom: 12px; }
.reader-page-list,.reader-course-list { display: grid; gap: 6px; }
.reader-page-link { display: flex; align-items: center; gap: 9px; padding: 10px; border-radius: 9px; color: var(--muted); font-size: 12px; }
.reader-page-link span { flex: 0 0 23px; font-weight: 800; color: var(--accent-strong); }
.reader-page-link strong { flex: 1; font-weight: 700; color: var(--text); overflow-wrap: anywhere; }
.reader-page-link small { font-size: 10px; }
.reader-page-link:hover,.reader-page-link.active { background: var(--accent-soft); color: var(--accent-strong); }
.reader-page-link.active { box-shadow: inset 3px 0 0 var(--accent); }
.reader-page-link.locked,.reader-page-link.locked:hover { opacity: .52; background: transparent; cursor: default; }
.reader-course-list a { display: flex; gap: 9px; padding: 9px 8px; border-radius: 8px; font-size: 11px; }
.reader-course-list a:hover,.reader-course-list a.active { background: var(--surface-soft); }
.reader-course-list a > span:first-child { flex: 0 0 23px; color: var(--accent-strong); font-weight: 800; }
.reader-course-list strong,.reader-course-list small { display: block; }
.reader-course-list strong { color: var(--text); line-height: 1.45; }
.reader-course-list small { color: var(--muted); margin-top: 3px; }
.reader-main { min-width: 0; }
.reader-paper { min-height: 540px; max-width: none; padding: clamp(26px, 3.3vw, 56px); }
.reader-paper-top { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--line); padding-bottom: 16px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.reader-objective { margin-top: 28px; padding: 23px 28px; border-radius: 14px; background: var(--accent-soft); border-left: 4px solid var(--accent); }
.reader-objective p { max-width: 74ch; font-size: 16px; line-height: 1.75; margin: 10px 0 0; }
.reader-paper .lesson-blocks { gap: 27px; padding-top: 34px; font-size: 17px; line-height: 1.85; }
.reader-paper .lesson-block-paragraph,.reader-paper .lesson-rich-html,.reader-paper .lesson-quote { max-width: 78ch; }
.reader-paper .lesson-block-heading { font-size: clamp(26px, 2.5vw, 36px); margin: 4px 0 -9px; line-height: 1.2; }
.reader-paper .lesson-code pre { font-size: 15px; line-height: 1.65; padding: 22px; }
.reader-paper .lesson-figure img { max-height: 700px; }
.reader-endnote { margin: 38px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.reader-pager { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin: 20px 0; }
.reader-pager .button { min-height: 48px; font-size: 13px; }
.reader-read-note { color: var(--muted); font-size: 12px; margin: 0 0 20px; }
.reader-extra { max-width: none; margin-top: 20px; }
.reader-extra h2 { margin: 9px 0 16px; font-size: 23px; }
.course-learning-head { display: grid; grid-template-columns: minmax(240px,.7fr) minmax(0,1.3fr); min-height: 340px; overflow: hidden; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); margin: 18px 0 42px; }
.course-learning-cover { width: 100%; height: 100%; min-height: 300px; object-fit: cover; }
.course-learning-copy { padding: clamp(28px,3vw,48px); align-self: center; }
.course-learning-copy h1 { margin: 10px 0; font-size: clamp(31px,3vw,46px); line-height: 1.13; letter-spacing: -.05em; }
.course-learning-copy p { color: var(--muted); line-height: 1.7; margin: 0 0 20px; }
.course-learning-progress { margin: 0 0 22px; max-width: 480px; }
.course-learning-progress strong { display: block; font-size: 13px; margin-bottom: 10px; }
.learning-section { margin-top: 28px; }
.learning-list { display: grid; gap: 10px; }
.learning-item { display: flex; align-items: center; gap: 17px; min-height: 88px; padding: 17px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); transition: transform .2s,border-color .2s,box-shadow .2s; }
.learning-item:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: var(--shadow); }
.learning-number { display: grid; place-items: center; flex: 0 0 42px; height: 42px; border-radius: 11px; background: var(--accent-soft); color: var(--accent-strong); font-weight: 800; }
.learning-item .row-main { flex: 1; min-width: 0; }
.learning-item .row-main strong { font-size: 16px; }
.learning-item .row-main small { display: block; color: var(--muted); margin-top: 4px; }
.learning-item .row-arrow { color: var(--accent-strong); font-weight: 800; }
.learning-item.completed { background: var(--surface-soft); }
.information-identity { display: flex; align-items: center; gap: 18px; margin-bottom: 22px; }
.information-identity .avatar { width: 62px; height: 62px; flex-basis: 62px; font-size: 23px; }
.information-identity > div:nth-child(2) { display: grid; }
.information-identity > div:nth-child(2) strong { font-size: 20px; }
.information-identity > div:nth-child(2) span { color: var(--muted); font-size: 13px; }
.information-identity .student-id-card { margin-left: auto; }
.information-metrics { grid-template-columns: repeat(5,minmax(0,1fr)); }
.information-metrics .metric-card { min-height: 125px; }
.information-resume { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.information-resume h2 { margin: 6px 0; font-size: 22px; }
.information-resume p { margin: 0; color: var(--muted); font-size: 13px; }
@media (max-width: 1600px) { .reader-layout { grid-template-columns: minmax(0,1fr); }.reader-sidebar { position: static; grid-template-columns: minmax(0,1fr) minmax(0,1fr); }.reader-side-card { min-width: 0; }.reader-page-list { display: flex; flex-wrap: wrap; }.reader-page-link { flex: 1 1 150px; }.reader-course-list { max-height: 155px; overflow: auto; } }
@media (max-width: 850px) { .reader-sidebar { grid-template-columns: minmax(0,1fr); }.reader-side-card:last-child { display: none; }.course-learning-head { grid-template-columns: 1fr; }.course-learning-cover { max-height: 230px; min-height: 180px; }.information-metrics { grid-template-columns: repeat(2,minmax(0,1fr)); }.information-identity { flex-wrap: wrap; }.information-identity .student-id-card { margin-left: 0; } }
@media (max-width: 560px) { .reader-intro { display: block; }.reader-intro h1 { font-size: 34px; }.reader-intro p { font-size: 14px; }.reader-intro .status-pill { display: inline-block; margin-top: 15px; }.reader-progress { padding: 14px 16px; }.reader-paper { min-height: 420px; padding: 25px 20px; }.reader-paper .lesson-blocks { font-size: 16px; }.reader-paper .lesson-code pre { font-size: 13px; }.reader-pager .button { width: 100%; }.reader-pager form { flex: 1; }.reader-paper-top { font-size: 9px; }.reader-objective { padding: 18px; }.reader-page-link { flex-basis: 120px; }.learning-item { align-items: flex-start; flex-wrap: wrap; }.learning-item .row-main { flex-basis: calc(100% - 62px); }.learning-item .status-pill,.learning-item .row-arrow { margin-left: 60px; }.information-resume { align-items: flex-start; flex-direction: column; }.information-metrics { gap: 10px; } }
.lesson-upload-guide { margin: 16px 0; font-size: 13px; line-height: 1.7; }
.lesson-upload-guide strong { display: block; font-size: 15px; margin-bottom: 7px; }
.lesson-upload-guide p { margin: 0; color: var(--muted); }
.lesson-upload-guide code { padding: 2px 5px; border: 1px solid var(--line); border-radius: 5px; color: var(--accent-strong); background: var(--surface-soft); }
.reader-preview-map { display: grid; gap: 10px; }
.reader-preview-map > div { padding: 9px 8px; border-top: 1px solid var(--line); }
.reader-preview-map strong,.reader-preview-map small { display: block; }
.reader-preview-map strong { font-size: 11px; }
.reader-preview-map small { margin-top: 5px; font-size: 10px; color: var(--muted); line-height: 1.45; }
.lesson-page-plan { margin: 16px 0; }
.lesson-page-plan > strong { display: block; font-size: 15px; }
.lesson-page-plan > p { color: var(--muted); font-size: 13px; margin: 5px 0 0; }
.lesson-page-plan-list { display: grid; gap: 8px; margin-top: 14px; }
.lesson-page-plan-item { padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-soft); }
.lesson-page-plan-item strong,.lesson-page-plan-item small { display: block; }
.lesson-page-plan-item small { margin-top: 4px; color: var(--muted); font-size: 12px; }
.lesson-page-plan-item details { margin-top: 10px; border-top: 1px solid var(--line); padding-top: 8px; font-size: 12px; }
.lesson-page-plan-item summary { cursor: pointer; color: var(--accent-strong); font-weight: 700; }
.lesson-page-plan-item ul { margin: 9px 0 0; padding-left: 18px; color: var(--muted); line-height: 1.65; }
@media (max-width: 560px) {
  .page-content:has(.reader-layout) { padding-inline: 17px; }
  .reader-intro { margin: 10px 0 17px; }
  .reader-intro h1 { font-size: 31px; margin: 7px 0; }
  .reader-intro p { line-height: 1.5; }
  .reader-progress { margin-bottom: 12px; }
  .reader-progress-label { margin-bottom: 8px; }
  .reader-layout { gap: 12px; }
  .reader-side-card { padding: 12px; }
  .reader-side-card .eyebrow { margin-bottom: 7px; }
  .reader-page-list { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 3px; }
  .reader-page-link { flex: 0 0 142px; min-height: 49px; padding: 7px; }
  .reader-page-link small { display: none; }
}
.course-learning-head { display: block; }
.course-learning-cover { display: block; width: 100%; height: clamp(220px, 24vw, 320px); min-height: 0; object-fit: cover; object-position: center 55%; background: #0e1b32; }
.course-learning-copy { padding: clamp(25px, 3vw, 42px); }
@media (max-width: 560px) { .course-learning-cover { height: 195px; }.course-learning-copy { padding: 24px 20px; } }
.form-layout:has([data-lesson-editor]) { max-width: 1560px; }
[data-lesson-editor] [hidden] { display: none !important; }
.lesson-editor-section { display: grid; gap: 19px; border-top: 1px solid var(--line); padding-top: 26px; }
.lesson-editor-heading h2,.lesson-attachments-heading h2 { font-size: clamp(22px,2.5vw,30px); letter-spacing: -.04em; margin: 5px 0 7px; }
.lesson-editor-heading p,.lesson-attachments-heading p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.lesson-editor-tabs { display: flex; gap: 7px; flex-wrap: wrap; padding: 5px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface-soft); width: fit-content; }
.lesson-editor-tab { min-height: 42px; border: 0; border-radius: 9px; background: transparent; color: var(--muted); padding: 0 18px; font-weight: 750; cursor: pointer; }
.lesson-editor-tab.active { color: var(--accent-strong); background: var(--surface); box-shadow: var(--shadow); }
.lesson-pages-toolbar { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; margin: 3px 0 11px; }
.lesson-pages-toolbar strong { font-size: 15px; }.lesson-pages-toolbar span { font-size: 12px; color: var(--muted); }
.lesson-editor-pages { display: grid; gap: 15px; margin-bottom: 15px; }
.lesson-page-card { border: 1px solid var(--line); border-radius: 15px; background: var(--surface-soft); padding: clamp(18px,2.5vw,25px); display: grid; gap: 10px; }
.lesson-page-card-bar { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 6px; }
.lesson-page-card-bar strong { color: var(--accent-strong); font-size: 15px; }
.lesson-card-actions { display: flex; gap: 5px; }
.lesson-card-action { width: 35px; height: 35px; border: 1px solid var(--line); border-radius: 9px; color: var(--text); background: var(--surface); font-size: 17px; cursor: pointer; }
.lesson-card-action:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-strong); }
.lesson-card-action:disabled,.lesson-preview-actions button:disabled { opacity: .35; cursor: default; }
.lesson-page-card label { font-size: 12px; font-weight: 750; }
.lesson-page-card input,.lesson-page-card textarea { width: 100%; padding: 12px 14px; background: var(--input); border: 1px solid var(--line); border-radius: 9px; color: var(--text); font-size: 14px; line-height: 1.6; }
.lesson-page-card input:focus,.lesson-page-card textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.lesson-page-card textarea { min-height: 180px; resize: vertical; }
.lesson-block-list { display: grid; gap: 12px; }
.lesson-edit-block { border: 1px solid var(--line); background: var(--surface); border-radius: 12px; padding: 16px; display: grid; gap: 12px; }
.lesson-edit-block-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }.lesson-edit-block-head strong { font-size: 13px; color: var(--accent-strong); }
.lesson-edit-block label { display: grid; gap: 6px; }.lesson-edit-block input,.lesson-edit-block select,.lesson-edit-block textarea { min-height: 41px; }.lesson-edit-block textarea { min-height: 112px; }
.lesson-add-block,.lesson-format-toolbar,.lesson-block-options { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; }.lesson-add-block { padding-top: 5px; }.lesson-add-block .button { padding: 8px 11px; font-size: 11px; min-height: 34px; }
.lesson-format-toolbar .lesson-card-action { width: auto; min-width: 36px; padding: 0 9px; font-size: 13px; font-weight: 800; }.lesson-format-toolbar [data-action="italic"] { font-style: italic; }
.lesson-rich-edit { min-height: 120px; padding: 16px; background: var(--input); color: var(--text); border: 1px solid var(--line); border-radius: 9px; font-size: 16px; line-height: 1.75; white-space: pre-wrap; overflow-wrap: anywhere; }.lesson-rich-edit:focus { outline: 2px solid var(--accent); outline-offset: 1px; }.lesson-rich-edit:empty::before { content: 'Escribe aquí. Selecciona texto para aplicar formato o pega una imagen con Ctrl+V.'; color: var(--muted); pointer-events: none; }
.lesson-block-options span { font-size: 11px; font-weight: 750; color: var(--muted); }.lesson-block-options select { width: auto; min-width: 145px; padding: 8px 10px; }
.lesson-edit-image-preview { display: block; max-width: min(100%, 400px); max-height: 250px; border: 1px solid var(--line); border-radius: 9px; }.lesson-edit-image-preview[hidden] { display: none; }
.lesson-preview-refresh { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; padding: 13px 18px; }.lesson-preview-refresh span { color: var(--muted); font-size: 12px; }
.lesson-live-preview { margin-top: 24px; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.lesson-live-preview .reader-paper { border: 0; border-radius: 0; box-shadow: none; min-height: 230px; }
.lesson-preview-top { display: flex; justify-content: space-between; gap: 12px; background: var(--surface-soft); border-bottom: 1px solid var(--line); padding: 14px 20px; color: var(--muted); font-size: 11px; letter-spacing: .08em; font-weight: 800; }
.lesson-preview-top strong { color: var(--accent-strong); letter-spacing: normal; }
.lesson-preview-paper { padding: clamp(22px,3vw,38px); min-height: 210px; }
.lesson-preview-paper h3 { font-size: clamp(22px,3vw,29px); margin: 0 0 18px; letter-spacing: -.04em; }
.lesson-preview-paper div { white-space: pre-wrap; font-size: 16px; line-height: 1.8; overflow-wrap: anywhere; }
.lesson-preview-actions { display: flex; justify-content: space-between; gap: 10px; border-top: 1px solid var(--line); padding: 13px 18px; }
.lesson-import-panel { border: 1px solid var(--line); border-radius: 14px; padding: 22px; background: var(--surface-soft); }
.lesson-import-intro strong { font-size: 17px; }.lesson-import-intro p { font-size: 13px; line-height: 1.7; color: var(--muted); }
.lesson-import-panel .form-actions { flex-wrap: wrap; margin-bottom: 18px; }
.lesson-mode-notice { border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 7px; padding: 12px 15px; font-size: 13px; line-height: 1.6; }
.lesson-attachments-heading { border-top: 1px solid var(--line); padding-top: 26px; margin-top: 7px; }
.lesson-optional-details { border: 1px solid var(--line); border-radius: 13px; background: var(--surface-soft); }
.lesson-optional-details > summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 17px 20px; cursor: pointer; list-style: none; }
.lesson-optional-details > summary::-webkit-details-marker { display: none; }
.lesson-optional-details > summary strong,.lesson-optional-details > summary small { display: block; }
.lesson-optional-details > summary strong { font-size: 14px; }.lesson-optional-details > summary small { margin-top: 4px; font-size: 11px; color: var(--muted); }
.lesson-optional-details[open] > summary { border-bottom: 1px solid var(--line); }
.lesson-optional-details[open] > summary > span:last-child { transform: rotate(180deg); }
.lesson-optional-inner { display: grid; gap: 18px; padding: 0 20px 20px; }
.lesson-optional-inner .lesson-attachments-heading { margin-top: 0; border-top: 0; }
.learning-list .empty-state.learning-empty { align-items: center; text-align: center; min-height: 205px; padding: 28px; }
.learning-empty .empty-symbol { margin-inline: auto; }
.learning-empty h3 { font-size: 20px; margin-bottom: 8px; }
.learning-empty p { max-width: 440px; font-size: 13px; margin: 0 auto; }
@media (max-width: 560px) { .form-layout:has([data-lesson-editor]) .form-card { padding: 18px; }.lesson-editor-tabs { width: 100%; }.lesson-editor-tab { flex: 1; padding: 0 9px; font-size: 11px; }.lesson-preview-actions .button { padding-inline: 10px; font-size: 11px; }.lesson-import-panel { padding: 16px; } }
.lesson-import-index { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 7px; }
.lesson-import-page { flex: 0 0 auto; border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px; background: var(--surface); color: var(--text); cursor: pointer; font-size: 12px; font-weight: 700; }
.lesson-import-page.active { border-color: var(--accent); color: var(--accent-strong); background: var(--accent-soft); }
.lesson-import-viewer { border: 1px solid var(--line); border-radius: 15px; background: var(--surface); overflow: hidden; }
.lesson-import-viewer .reader-paper-top { margin: 0 22px; padding-top: 18px; }
.lesson-import-viewer [data-import-content] { min-height: 210px; }
.lesson-import-viewer .reader-paper { border: 0; border-radius: 0; box-shadow: none; min-height: 250px; }
.lesson-import-viewer .reader-extra { margin: 0 20px 20px; box-shadow: none; }
.lesson-workspace { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(350px, .8fr); gap: 22px; align-items: start; }
.lesson-workspace-editor { min-width: 0; }
.lesson-workspace .lesson-live-preview { margin-top: 0; position: sticky; top: 20px; max-height: calc(100vh - 40px); overflow: auto; background: var(--surface); }
.lesson-page-card { padding: 0; overflow: hidden; gap: 0; background: var(--surface); }
.lesson-page-card-bar { padding: 14px 20px; margin: 0; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.lesson-page-card > label { margin: 17px 20px 14px; }
.lesson-page-card > label input { font-size: 18px; font-weight: 750; }
.lesson-format-toolbar { padding: 10px 16px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.lesson-format-toolbar select { width: auto; min-width: 126px; max-width: 175px; padding: 7px 9px; min-height: 35px; font-size: 12px; }
.lesson-toolbar-caption { color: var(--muted); font-size: 11px; font-weight: 800; margin-right: 5px; }
.lesson-source-toggle { min-height: 34px; padding: 7px 10px; font-size: 11px; margin-left: auto; }
.lesson-add-block { padding: 11px 16px; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.lesson-page-canvas { display: block; padding: clamp(20px, 3vw, 38px); min-height: 380px; }
.lesson-page-canvas .lesson-edit-block { display: block; padding: 7px 0 14px; margin: 0; border: 0; border-radius: 0; background: transparent; border-bottom: 1px dashed transparent; }
.lesson-page-canvas .lesson-edit-block:hover,.lesson-page-canvas .lesson-edit-block:focus-within { border-bottom-color: var(--line); }
.lesson-edit-block-head { min-height: 23px; opacity: .7; margin-bottom: 4px; }
.lesson-edit-block-head strong { font-size: 10px; text-transform: uppercase; letter-spacing: .09em; }
.lesson-edit-block-head .lesson-card-action { width: 25px; height: 25px; font-size: 14px; }
.lesson-rich-edit { min-height: 70px; padding: 6px 0; border: 0; background: transparent; border-radius: 0; font-size: 17px; line-height: 1.85; }
.lesson-rich-edit:focus { outline: none; box-shadow: inset 0 -2px var(--accent); }
.lesson-edit-block[data-font="serif"] .lesson-rich-edit,.lesson-edit-block[data-font="serif"] [data-text] { font-family: Georgia, 'Times New Roman', serif; }
.lesson-edit-block[data-font="mono"] .lesson-rich-edit,.lesson-edit-block[data-font="mono"] [data-text] { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.lesson-edit-block[data-font="display"] .lesson-rich-edit,.lesson-edit-block[data-font="display"] [data-text] { font-family: Georgia, serif; letter-spacing: -.035em; }
.lesson-edit-block[data-font="humanist"] .lesson-rich-edit,.lesson-edit-block[data-font="humanist"] [data-text] { font-family: 'Trebuchet MS', Verdana, sans-serif; }
.lesson-edit-block[data-size="xs"] .lesson-rich-edit { font-size: 12px; }.lesson-edit-block[data-size="small"] .lesson-rich-edit { font-size: 14px; }.lesson-edit-block[data-size="large"] .lesson-rich-edit { font-size: 21px; }.lesson-edit-block[data-size="xl"] .lesson-rich-edit { font-size: 26px; }.lesson-edit-block[data-size="xxl"] .lesson-rich-edit { font-size: 32px; }
.lesson-edit-block[data-kind="subheading"] [data-text] { font-size: 26px; font-weight: 800; border: 0; background: transparent; padding: 8px 0; }
.lesson-edit-block[data-level="subsection"] [data-text] { font-size: 20px; }
.lesson-edit-block[data-kind="quote"],.lesson-edit-block[data-kind="callout"] { padding-left: 17px; border-left: 3px solid var(--accent); margin: 8px 0; }
.lesson-edit-block[data-kind="code"] textarea,.lesson-edit-block[data-kind="html"] textarea { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 13px; background: var(--surface-soft); }
.lesson-edit-block[data-kind="image"] { text-align: center; }.lesson-edit-block[data-kind="image"] .lesson-edit-block-head { text-align: left; }
.lesson-edit-image-preview { max-width: 100%; max-height: none; height: auto; margin: 10px auto; }
.lesson-block-options { justify-content: center; }.lesson-block-options .lesson-image-width { width: clamp(90px, 12vw, 155px); padding: 0; }
.lesson-page-source { margin: 20px; width: calc(100% - 40px) !important; min-height: 430px !important; font: 13px/1.65 ui-monospace, SFMono-Regular, Consolas, monospace !important; }
@media (max-width: 1100px) { .lesson-workspace { grid-template-columns: 1fr; }.lesson-workspace .lesson-live-preview { position: static; max-height: none; } }
.lesson-workspace { grid-template-columns: minmax(0, 1fr) 280px; }
.lesson-workspace:has(.lesson-inspector[hidden]) { grid-template-columns: minmax(0, 1fr); }
.lesson-inspector[hidden] { display: none; }
.lesson-page-body { min-height: 620px; padding: clamp(24px,4vw,52px); color: var(--text); background: var(--surface); font-size: 18px; line-height: 1.85; overflow-wrap: anywhere; outline: none; }
.lesson-page-body:focus { box-shadow: inset 0 0 0 2px var(--accent); }
.lesson-page-body:empty::before { content: 'Escribe aquí tu lección. Pega una imagen o usa las herramientas de arriba.'; color: var(--muted); pointer-events: none; }
.lesson-page-body > p { margin: 0 0 1.15em; min-height: 1.85em; }
.lesson-page-body > p:last-child:empty { min-height: 86px; cursor: text; }
.lesson-page-body > h2 { font-size: 1.65em; line-height: 1.3; margin: 1.1em 0 .5em; }
.lesson-page-body > h4 { font-size: 1.25em; line-height: 1.35; margin: 1em 0 .5em; }
.lesson-page-body > blockquote { border-left: 4px solid var(--accent); margin: 1.3em 0; padding: .5em 1em; background: var(--surface-soft); border-radius: 0 9px 9px 0; }
.lesson-page-body > aside { border: 1px solid var(--accent); border-radius: 10px; margin: 1.3em 0; padding: .7em 1em; background: var(--accent-soft); }
.lesson-page-body > pre { white-space: pre-wrap; font: 14px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace; padding: 18px; margin: 1.3em 0; border-radius: 10px; background: var(--surface-soft); border: 1px solid var(--line); }
.lesson-page-body > blockquote,.lesson-page-body > aside { white-space: pre-wrap; }
.lesson-page-body > [data-kind="html"] { padding: 12px 0; }
.lesson-page-body [data-placeholder]:empty::before { content: attr(data-placeholder); color: var(--muted); pointer-events: none; }
.lesson-page-body > [data-kind="pdf"] { display: block; width: fit-content; margin: 1.2em 0; padding: 13px 17px; border: 1px solid var(--line); border-radius: 9px; color: var(--accent-strong); background: var(--surface-soft); }
.lesson-page-body [data-font="serif"] { font-family: Georgia,'Times New Roman',serif; }
.lesson-page-body [data-font="mono"] { font-family: ui-monospace,SFMono-Regular,Consolas,monospace; }
.lesson-page-body [data-font="display"] { font-family: Georgia,serif; letter-spacing: -.035em; }
.lesson-page-body [data-font="humanist"] { font-family: 'Trebuchet MS',Verdana,sans-serif; }
.lesson-page-body [data-size="xs"] { font-size: 12px; }.lesson-page-body [data-size="small"] { font-size: 14px; }
.lesson-page-body [data-size="large"] { font-size: 21px; }.lesson-page-body [data-size="xl"] { font-size: 26px; }.lesson-page-body [data-size="xxl"] { font-size: 32px; }
.lesson-inline-image { display: block; width: 100%; max-width: 100%; padding: 8px 0 13px; cursor: pointer; user-select: none; }
.lesson-inline-image[data-align="left"] { text-align: left; }.lesson-inline-image[data-align="center"] { text-align: center; }.lesson-inline-image[data-align="right"] { text-align: right; }
.lesson-inline-image-frame { display: inline-block; position: relative; max-width: 100%; vertical-align: middle; }
.lesson-inline-image-frame img { display: block; width: 100%; max-width: 100%; height: auto; border-radius: 8px; pointer-events: none; }
.lesson-inline-caption { display: block; font-size: 13px; line-height: 1.5; color: var(--muted); margin-top: 6px; }
.lesson-inline-image.selected .lesson-inline-image-frame { outline: 2px solid var(--accent); outline-offset: 2px; }
.lesson-inline-image.selected .lesson-image-resize-handle,.lesson-inline-image:hover .lesson-image-resize-handle,.lesson-image-resize-handle:focus-visible { opacity: 1; pointer-events: auto; }
.lesson-inline-image.is-resizing .lesson-inline-image-frame { outline: 2px dashed var(--accent); outline-offset: 4px; }
.lesson-page-body[hidden] { display: none; }
@media (max-width: 1100px) { .lesson-workspace:has(.lesson-inspector:not([hidden])) { grid-template-columns: minmax(0,1fr); }.lesson-inspector { position: static; } }
.lesson-inspector { position: sticky; top: 20px; border: 1px solid var(--line); border-radius: 15px; background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
.lesson-inspector-head { padding: 19px 20px 16px; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.lesson-inspector-head h3 { font-size: 18px; margin: 5px 0 0; letter-spacing: -.025em; }
.lesson-inspector-body { display: grid; gap: 15px; padding: 20px; font-size: 13px; }
.lesson-inspector-body p { color: var(--muted); line-height: 1.65; margin: 0; }
.lesson-inspector-body label { display: grid; gap: 7px; font-size: 12px; font-weight: 750; }
.lesson-inspector-body .form-control { width: 100%; min-height: 40px; }
.lesson-inspector-body .lesson-inspector-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lesson-inspector-body .lesson-inspector-width { display: flex; gap: 9px; align-items: center; }
.lesson-inspector-body .lesson-inspector-width input { width: 100%; }
.lesson-inspector-body .lesson-inspector-width output { min-width: 50px; text-align: right; }
.lesson-inspector-body .button { width: 100%; justify-content: center; }
.lesson-edit-block.selected { outline: 2px solid var(--accent); outline-offset: 5px; border-radius: 5px; }
.lesson-edit-block [data-image-settings],.lesson-edit-block [data-code-settings] { display: none !important; }
.lesson-image-placeholder { width: 100%; min-height: 140px; border: 1px dashed var(--accent); border-radius: 12px; background: var(--accent-soft); color: var(--accent-strong); font-size: 14px; font-weight: 750; cursor: pointer; }
.lesson-edit-block[data-kind="image"] .lesson-edit-image-preview { cursor: pointer; }
.lesson-image-stage { display: flex; justify-content: center; width: 100%; min-width: 0; padding: 10px 0; }
.lesson-edit-block[data-align="left"] .lesson-image-stage { justify-content: flex-start; }
.lesson-edit-block[data-align="right"] .lesson-image-stage { justify-content: flex-end; }
.lesson-image-frame { position: relative; max-width: 100%; min-width: min(160px, 100%); }
.lesson-image-frame .lesson-edit-image-preview { display: block; width: 100%; max-width: none; max-height: 620px; height: auto; margin: 0; object-fit: contain; }
.lesson-image-resize-handle { position: absolute; z-index: 3; display: grid; place-items: center; width: 22px; height: 22px; padding: 0; border: 0; background: transparent; opacity: 0; pointer-events: none; touch-action: none; user-select: none; transition: opacity .12s ease; }
.lesson-image-resize-handle::after { content: ''; display: block; width: 10px; height: 10px; border: 2px solid var(--surface); border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 2px 5px rgba(0, 0, 0, .28); }
.lesson-edit-block.selected .lesson-image-resize-handle,.lesson-edit-block[data-kind="image"]:hover .lesson-image-resize-handle,.lesson-image-resize-handle:focus-visible { opacity: 1; pointer-events: auto; }
.lesson-edit-block.selected .lesson-image-frame { outline: 1px solid var(--accent); outline-offset: 1px; }
.lesson-image-resize-handle[data-resize-handle="nw"] { top: -11px; left: -11px; cursor: nwse-resize; }
.lesson-image-resize-handle[data-resize-handle="n"] { top: -11px; left: calc(50% - 11px); cursor: ns-resize; }
.lesson-image-resize-handle[data-resize-handle="ne"] { top: -11px; right: -11px; cursor: nesw-resize; }
.lesson-image-resize-handle[data-resize-handle="e"] { top: calc(50% - 11px); right: -11px; cursor: ew-resize; }
.lesson-image-resize-handle[data-resize-handle="se"] { bottom: -11px; right: -11px; cursor: nwse-resize; }
.lesson-image-resize-handle[data-resize-handle="s"] { bottom: -11px; left: calc(50% - 11px); cursor: ns-resize; }
.lesson-image-resize-handle[data-resize-handle="sw"] { bottom: -11px; left: -11px; cursor: nesw-resize; }
.lesson-image-resize-handle[data-resize-handle="w"] { top: calc(50% - 11px); left: -11px; cursor: ew-resize; }
.lesson-edit-block.is-resizing .lesson-image-frame { outline: 2px dashed var(--accent); outline-offset: 4px; }
.lesson-page-canvas .lesson-edit-block[data-kind="paragraph"]:last-child .lesson-rich-edit:empty { min-height: 80px; }
.lesson-preview-modal { width: 100vw; max-width: none; height: 100vh; max-height: none; margin: 0; padding: 0; border: 0; background: var(--bg); color: var(--text); overflow: auto; }
.lesson-preview-modal::backdrop { background: rgba(4, 12, 25, .78); }
.lesson-preview-modal-inner { max-width: 1120px; min-height: 100vh; margin: auto; padding: clamp(15px, 3vw, 32px); }
.lesson-preview-modal-head { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 10px 0 20px; }
.lesson-preview-modal-head h2 { font-size: clamp(22px, 3vw, 34px); margin: 4px 0 0; letter-spacing: -.04em; }
.lesson-preview-modal .lesson-preview-top { border: 1px solid var(--line); border-radius: 15px 15px 0 0; }
.lesson-preview-modal .lesson-preview-refresh { border-inline: 1px solid var(--line); background: var(--surface); }
.lesson-preview-modal [data-preview-body] { background: var(--surface); border-inline: 1px solid var(--line); }
.lesson-preview-modal [data-preview-body] .reader-paper { max-width: none; border: 0; border-radius: 0; box-shadow: none; }
.lesson-preview-modal .lesson-preview-actions { border: 1px solid var(--line); border-radius: 0 0 15px 15px; background: var(--surface); }
.lesson-page-navigation { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; padding: 12px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface-soft); }
.lesson-page-picker { position: relative; min-width: min(290px, 45%); display: flex; align-items: center; gap: 10px; }
.lesson-page-picker > label { flex: none; font-size: 12px; font-weight: 800; white-space: nowrap; }
.lesson-page-picker > input { width: 100%; min-height: 39px; font-size: 12px; }
.lesson-page-options { position: absolute; z-index: 30; top: calc(100% + 5px); left: 0; right: 0; max-height: 245px; overflow-y: auto; overscroll-behavior: contain; padding: 5px; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); box-shadow: 0 15px 35px rgba(0, 0, 0, .2); }
.lesson-page-option { display: block; width: 100%; padding: 10px 11px; border: 0; border-radius: 7px; background: transparent; color: var(--text); text-align: left; font-size: 12px; cursor: pointer; }
.lesson-page-option:hover,.lesson-page-option.highlighted { background: var(--accent-soft); color: var(--accent-strong); }
.lesson-page-no-results { margin: 0; padding: 10px; color: var(--muted); font-size: 12px; }
.lesson-page-navigation button:disabled { opacity: .42; cursor: default; }
.lesson-preview-open { overflow: hidden; }
@media (max-width: 1100px) { .lesson-workspace { grid-template-columns: 1fr; }.lesson-inspector { position: static; }.lesson-inspector-body { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); } }
@media (max-width: 600px) { .lesson-page-navigation { flex-wrap: wrap; }.lesson-page-picker { order: -1; width: 100%; min-width: 0; }.lesson-page-navigation button { flex: 1; }.lesson-preview-modal-head { align-items: flex-start; }.lesson-preview-modal-head .button { white-space: nowrap; } }
.lesson-import-viewer .lesson-blocks { font-size: 16px; line-height: 1.8; }
.lesson-import-viewer .lesson-preview-actions { background: var(--surface-soft); }
.lesson-import-metadata { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.lesson-import-metadata > div { padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); overflow-wrap: anywhere; }
.lesson-import-metadata strong,.lesson-import-metadata span { display: block; }
.lesson-import-metadata strong { font-size: 10px; color: var(--accent-strong); text-transform: uppercase; letter-spacing: .05em; }
.lesson-import-metadata span { margin-top: 5px; font-size: 12px; line-height: 1.5; color: var(--text); }
.lesson-guide { max-width: 1050px; display: grid; gap: 20px; }
.lesson-guide .page-heading { margin-bottom: 0; }
.lesson-guide .heading-actions { align-items: center; }
.lesson-guide [data-copy-guide][hidden] { display: none; }
.lesson-guide .surface-card h2 { font-size: 24px; margin: 0 0 10px; }
.lesson-guide .surface-card p { color: var(--muted); font-size: 14px; line-height: 1.7; }

.global-confirm { width: min(460px, calc(100vw - 32px)); max-width: none; padding: 0; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); color: var(--text); box-shadow: 0 24px 70px rgba(0, 0, 0, .24); }
.global-confirm::backdrop { background: rgba(3, 9, 18, .68); backdrop-filter: blur(4px); }
.global-confirm-card { padding: clamp(24px, 4vw, 34px); }
.global-confirm h2 { margin: 10px 0; font-size: 25px; line-height: 1.2; }
.global-confirm p { color: var(--muted); line-height: 1.65; margin: 0 0 24px; }
.global-confirm .form-actions { justify-content: flex-end; margin: 0; }

.evidence-reading { max-width: 1060px; margin-top: 20px; }
.evidence-reading h2 { margin: 8px 0 18px; font-size: clamp(22px, 3vw, 30px); }
.evidence-reading-copy { font-size: clamp(17px, 1.5vw, 20px); line-height: 1.9; overflow-wrap: anywhere; }
.evidence-reading-copy p { margin: 0 0 1em; }
.evidence-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; margin-top: 18px; }
.evidence-gallery-item { display: flex; flex-direction: column; text-align: left; padding: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); color: var(--text); cursor: pointer; }
.evidence-gallery-item img { width: 100%; height: 170px; object-fit: cover; background: var(--bg); }
.evidence-gallery-item span { padding: 12px; font-size: 13px; overflow-wrap: anywhere; }
.evidence-file-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.evidence-lightbox { width: min(1100px, calc(100vw - 24px)); max-width: none; height: min(90vh, 900px); max-height: none; padding: 0; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); color: var(--text); }
.evidence-lightbox::backdrop { background: rgba(2, 7, 15, .88); }
.evidence-lightbox-inner { display: flex; flex-direction: column; height: 100%; padding: 16px; gap: 12px; }
.evidence-lightbox-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.evidence-lightbox-head strong { overflow-wrap: anywhere; }
.evidence-lightbox-stage { display: grid; place-items: center; min-height: 0; flex: 1; overflow: auto; border-radius: 12px; background: var(--bg); }
.evidence-lightbox-stage img { max-width: 100%; max-height: 100%; object-fit: contain; }
.evidence-lightbox-stage img.zoomed { max-width: none; max-height: none; width: 150%; }
.evidence-lightbox-controls { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px; }
.lesson-guide code { color: var(--accent-strong); }
.lesson-guide pre { overflow-x: auto; padding: 20px; border-radius: 12px; background: var(--surface-soft); border: 1px solid var(--line); color: var(--text); font-size: 13px; line-height: 1.6; }
.lesson-guide pre code { color: var(--text); }
.lesson-guide-code { position: relative; min-width: 0; }
.lesson-guide-code pre { padding-top: 54px; }
.lesson-guide-copy { position: absolute; top: 11px; right: 11px; z-index: 1; padding: 7px 11px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--text); font: inherit; font-size: 11px; font-weight: 800; cursor: pointer; }
.lesson-guide-copy:hover,.lesson-guide-copy:focus-visible { color: var(--accent-strong); border-color: var(--accent); }
.lesson-guide-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 15px; }
.lesson-guide-grid > div { background: var(--surface-soft); border: 1px solid var(--line); border-radius: 12px; padding: 17px; }
@media (max-width: 650px) { .lesson-guide-grid,.lesson-import-metadata { grid-template-columns: 1fr; }.lesson-import-viewer .reader-paper-top { margin-inline: 16px; } }
.status-warning { color: #9a5b0d; background: #fff1d5; }
.timezone-notice { display: flex; justify-content: space-between; align-items: center; gap: 20px; border-color: var(--accent); margin: 0 0 20px; background: var(--accent-soft); }
.timezone-notice h2 { font-size: 20px; margin: 5px 0; }
.timezone-notice p { font-size: 13px; line-height: 1.6; color: var(--muted); margin: 0; }
.timezone-notice .button { flex: 0 0 auto; }
@media (max-width: 650px) { .timezone-notice { align-items: stretch; flex-direction: column; }.timezone-notice .button { width: 100%; } }