:root {
  --ink: #162019;
  --muted: #627066;
  --paper: #f7f7f2;
  --surface: #ffffff;
  --line: #dfe5de;
  --green: #217346;
  --green-dark: #155a34;
  --lime: #d9ed72;
  --sky: #dbeaf5;
  --gold: #f6d684;
  --red: #d95d45;
  --sidebar: #123023;
  --radius: 8px;
}

[data-theme="dark"] {
  --ink: #edf4ee;
  --muted: #a7b6aa;
  --paper: #14201a;
  --surface: #1b2a22;
  --line: #314438;
  --green: #69be82;
  --green-dark: #9cddb0;
  --lime: #bddc6f;
  --sky: #29485a;
  --gold: #e4ba55;
  --red: #f1846a;
  --sidebar: #0d1f16;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "IBM Plex Sans Thai", system-ui, sans-serif; line-height: var(--line-height, 1.65); }
button, input { font: inherit; }
button { cursor: pointer; }
main { min-height: 100vh; margin-left: 0; transition: margin-left .85s cubic-bezier(0.65, 0, 0.35, 1); }
body.sidebar-pinned main { margin-left: 272px; }
.sidebar { position: fixed; z-index: 6; top: 0; bottom: 0; width: 272px; padding: 24px 16px 18px; background: var(--sidebar); color: #eaf5e9; display: flex; flex-direction: column; overflow-y: auto; transform: translateX(-100%); transition: transform .85s cubic-bezier(0.65, 0, 0.35, 1); will-change: transform; box-shadow: 12px 0 30px #0003; }
.sidebar.open, .sidebar.pinned { transform: translateX(0); }
.sidebar-backdrop { position: fixed; inset: 0; z-index: 5; background: rgba(10, 16, 12, .45); opacity: 0; pointer-events: none; transition: opacity .85s cubic-bezier(0.65, 0, 0.35, 1); will-change: opacity; }
.sidebar-backdrop.show { opacity: 1; pointer-events: auto; }
.sidebar-header { display: flex; align-items: center; gap: 9px; padding: 0 4px 24px; }
.mascot-link { flex: none; display: block; border-radius: 50%; transition: transform .2s ease; }
.mascot-link:hover { transform: scale(1.08); }
.brand { flex: 1; min-width: 0; display: flex; gap: 11px; align-items: center; color: #fff; text-decoration: none; font-weight: 700; line-height: 1.25; }
.brand small { display: block; opacity: .7; font-weight: 400; font-size: 12px; margin-top: 3px; }
.brand-mark { width: 37px; height: 37px; flex: none; border-radius: 50%; object-fit: cover; background: var(--lime); display: block; }
.pin-button { flex: none; width: 32px; height: 32px; border: 1px solid rgba(255,255,255,.18); border-radius: 7px; background: rgba(255,255,255,.06); color: #c3d4c6; font-size: 14px; opacity: .75; }
.pin-button:hover { opacity: 1; }
.pin-button[aria-pressed="true"] { background: var(--lime); color: #1b3f2b; border-color: var(--lime); opacity: 1; }
#chapter-nav { display: grid; gap: 3px; }
.nav-link, .sidebar-footer a, .sidebar-footer button { border: 0; background: none; text-align: left; color: #c3d4c6; padding: 9px 10px; border-radius: 6px; text-decoration: none; font-size: 14px; width: 100%; cursor: pointer; }
.nav-link:hover, .nav-link.active, .sidebar-footer a:hover, .sidebar-footer button:hover { color: #fff; background: rgba(255,255,255,.1); }
.nav-number { width: 24px; display: inline-block; color: #82c69a; font-family: "IBM Plex Mono", monospace; font-size: 11px; }
.sidebar-footer { display: grid; gap: 2px; margin-top: auto; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.12); }
.qr-modal-image { display: block; width: 100%; max-width: 420px; margin: 16px auto; border-radius: 14px; }
.student-name-field { display: grid; gap: 5px; margin-top: 14px; padding: 0 10px; }
.student-name-field-top { margin: 0 0 12px; padding: 0 4px; }
.upload-field { margin: 0 0 20px; padding: 0 4px 18px; border-bottom: 1px solid rgba(255,255,255,.12); display: grid; gap: 8px; }
.upload-trigger-btn { display: flex; align-items: center; justify-content: center; gap: 6px; width: 100%; padding: 9px 10px; border: 1px solid rgba(255,255,255,.18); border-radius: 6px; background: rgba(255,255,255,.06); color: #eaf5e9; font-size: 13px; font-weight: 600; }
.upload-trigger-btn:hover { border-color: var(--lime); color: var(--lime); }
.upload-trigger-btn:disabled { opacity: .5; cursor: not-allowed; }
.upload-history-btn { border: 0; background: none; color: #9cddb0; font-size: 11px; text-align: left; padding: 2px 2px; text-decoration: underline; text-underline-offset: 2px; }
.upload-history-btn:hover { color: var(--lime); }
.upload-history-btn:disabled { color: #7f9686; text-decoration: none; cursor: default; }
.upload-history-modal-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.upload-history-modal-list li { font-size: 14px; display: flex; justify-content: space-between; align-items: baseline; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--sky); }
.upload-history-modal-list li a { color: var(--green); font-weight: 600; text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-history-modal-list li a:hover { text-decoration: underline; }
.upload-history-modal-list small { color: var(--muted); white-space: nowrap; flex: none; }
.student-name-field span { font-size: 11px; color: #9db8a4; }
.student-name-field input { padding: 8px 9px; border: 1px solid rgba(255,255,255,.18); border-radius: 6px; background: rgba(255,255,255,.06); color: #eaf5e9; font-size: 13px; }
.student-name-field input::placeholder { color: #7f9686; }
.topbar { height: 72px; padding: 14px clamp(20px, 4vw, 64px); display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 4; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(12px); }
.search { flex: 1; max-width: 560px; height: 42px; display: flex; align-items: center; gap: 8px; padding: 0 12px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); color: var(--muted); }
.search input { width: 100%; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 14px; }
.icon-button { width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); color: var(--ink); font-size: 20px; }
.menu-button { display: grid; place-items: center; }
.app { width: min(1120px, 100%); margin: 0 auto; padding: clamp(28px, 5vw, 68px) clamp(20px, 4vw, 64px) 80px; }
.eyebrow { color: var(--green); font: 500 12px "IBM Plex Mono", monospace; letter-spacing: .09em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; letter-spacing: 0; }
h1 { font-size: clamp(34px, 5vw, 62px); margin: 10px 0 18px; max-width: 780px; }
h2 { font-size: clamp(25px, 3vw, 36px); margin: 0 0 12px; }
h3 { font-size: 19px; margin: 28px 0 8px; }
p { margin: 0 0 14px; }
.lede { color: var(--muted); max-width: 680px; font-size: 18px; }
.hero { border-bottom: 1px solid var(--line); padding-bottom: 54px; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 36px; align-items: center; }
.venue-badge { display: inline-flex; align-items: center; gap: 9px; padding: 6px 14px 6px 6px; margin-bottom: 16px; border-radius: 99px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 4px 14px #0001; }
.venue-badge img { width: 26px; height: 26px; border-radius: 50%; object-fit: cover; flex: none; }
.venue-badge span { font-size: 13px; font-weight: 600; color: var(--ink); letter-spacing: .01em; }
.hero-mascot-link { display: block; border-radius: 20px; transition: transform .2s ease; }
.hero-mascot-link:hover { transform: scale(1.015); }
.hero-mascot { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 20px; box-shadow: 0 18px 40px #0004; }
.density-switch { display: flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; flex: none; }
.density-option { border: 0; background: var(--surface); color: var(--muted); padding: 0 12px; height: 40px; font-size: 13px; font-weight: 600; }
.density-option + .density-option { border-left: 1px solid var(--line); }
.density-option.active { background: var(--green); color: #fff; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.tag { display: inline-flex; align-items: center; min-height: 30px; padding: 4px 10px; border-radius: 20px; background: var(--sky); color: var(--ink); font-size: 13px; }
.progress-wrap { margin-top: 40px; max-width: 620px; }
.progress-label { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; }
.progress { height: 9px; overflow: hidden; background: var(--line); border-radius: 99px; margin-top: 7px; }
.progress > i { display: block; height: 100%; background: var(--green); border-radius: inherit; transition: width .3s ease; }
.home-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 42px; padding: 52px 0; }
.chapter-list { border-top: 1px solid var(--line); }
.chapter-row { width: 100%; display: grid; grid-template-columns: 42px 1fr auto; gap: 12px; align-items: center; padding: 16px 4px; border: 0; border-bottom: 1px solid var(--line); background: transparent; color: var(--ink); text-align: left; }
.chapter-row:hover { color: var(--green); }
.chapter-row .number { color: var(--green); font: 500 12px "IBM Plex Mono", monospace; }
.chapter-row strong { display: block; font-size: 16px; }
.chapter-row small { color: var(--muted); }
.row-arrow { font-size: 22px; color: var(--muted); }
.principle { padding: 18px 0; border-bottom: 1px solid var(--line); }
.principle strong { color: var(--green); display: block; font-size: 15px; }
.principle p { color: var(--muted); margin: 4px 0 0; font-size: 14px; }
.chapter-header { display: grid; grid-template-columns: 1fr auto; gap: 22px; margin-bottom: 44px; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.chapter-header .chapter-no { align-self: start; color: var(--green); font: 500 13px "IBM Plex Mono", monospace; }
.learning { padding: 20px; background: var(--sky); border-radius: var(--radius); }
.learning h3 { margin-top: 0; }
.learning ul, .plain-list { margin: 0; padding-left: 20px; }
.learning li { margin: 7px 0; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 42px; }
.side-note { align-self: start; position: sticky; top: 94px; padding: 18px; border-left: 3px solid var(--lime); background: color-mix(in srgb, var(--lime) 17%, var(--surface)); font-size: 14px; }
.side-note strong { display: block; margin-bottom: 5px; }
.data-table { width: 100%; border-collapse: collapse; margin: 18px 0 24px; font-size: 14px; background: var(--surface); }
.data-table th, .data-table td { padding: 12px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
.data-table th { background: color-mix(in srgb, var(--green) 10%, var(--surface)); font-weight: 600; }
.steps { counter-reset: step; padding: 0; list-style: none; margin: 16px 0 24px; }
.steps li { position: relative; padding: 0 0 19px 43px; }
.steps li::before { counter-increment: step; content: counter(step); position: absolute; left: 0; top: 1px; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; color: white; background: var(--green); font: 500 12px "IBM Plex Mono", monospace; }
.steps li:not(:last-child)::after { content: ""; position: absolute; left: 12px; top: 29px; height: calc(100% - 9px); width: 1px; background: var(--line); }
.trap { margin: 22px 0; padding: 16px 18px; border: 1px solid color-mix(in srgb, var(--red) 50%, var(--line)); border-radius: var(--radius); background: color-mix(in srgb, var(--red) 8%, var(--surface)); }
.trap strong { color: var(--red); }
.checklist { display: grid; gap: 8px; margin: 16px 0 24px; }
.check-item { display: flex; gap: 11px; align-items: flex-start; padding: 11px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.check-item input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--green); }
.check-item.done { opacity: .62; }
.check-item.done span { text-decoration: line-through; }
.quiz { margin-top: 34px; padding-top: 8px; border-top: 1px solid var(--line); }
.quiz button, .primary-button { border: 0; border-radius: 6px; background: var(--green); color: #fff; padding: 10px 14px; font-weight: 600; }
.quiz-answer { display: none; margin-top: 10px; padding: 13px; background: var(--surface); border-left: 3px solid var(--green); font-size: 14px; }
.quiz-answer.show { display: block; }
.plan-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 26px 0 42px; }
.week { padding: 18px; min-height: 250px; border-top: 4px solid var(--green); background: var(--surface); }
.week h3 { margin: 0 0 8px; }
.week p { color: var(--muted); font-size: 14px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 720px; }
.field { display: grid; gap: 5px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 600; }
.field input { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink); background: var(--surface); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.review { border: 1px solid var(--line); padding: 18px; background: var(--surface); }
.review strong { color: var(--green); }
.code-block { overflow-x: auto; margin: 12px 0 28px; padding: 15px; border-radius: var(--radius); background: #102219; color: #e5f5e9; font: 13px/1.7 "IBM Plex Mono", monospace; white-space: pre; }
.search-results { display: grid; gap: 10px; margin-top: 22px; }
.result { padding: 16px; border: 1px solid var(--line); background: var(--surface); border-radius: var(--radius); }
.result button { padding: 0; border: 0; background: transparent; color: var(--green); font-weight: 700; text-align: left; }
.toast { position: fixed; z-index: 10; right: 24px; bottom: 24px; padding: 11px 14px; color: #fff; background: var(--green-dark); border-radius: 6px; box-shadow: 0 6px 22px #0003; }
@media (max-width: 900px) { body.sidebar-pinned main { margin-left: 0; } .content-grid, .home-grid, .hero { grid-template-columns: 1fr; } .hero-mascot { display: none; } .side-note { position: static; } .plan-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 580px) { .topbar { padding: 12px 16px; } .app { padding: 34px 20px 64px; } h1 { font-size: 36px; } .chapter-header { grid-template-columns: 1fr; } .plan-grid, .review-grid, .form-grid { grid-template-columns: 1fr; } .field.full { grid-column: auto; } .search { min-width: 0; } .search input { font-size: 13px; } .density-switch { display: none; } }

/* ---- Class workspace additions ---- */
.nav-group-label { margin: 18px 0 4px; padding: 0 10px; font: 500 11px "IBM Plex Mono", monospace; letter-spacing: .08em; text-transform: uppercase; color: #82c69a; opacity: .85; }
.nav-group-label:first-child { margin-top: 4px; }

.ghost-button { border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink); padding: 9px 13px; font-weight: 600; font-size: 14px; }
.ghost-button:hover { border-color: var(--green); color: var(--green); }
.ghost-button.active { border-color: var(--green); color: var(--green); background: color-mix(in srgb, var(--green) 10%, var(--surface)); }
.ghost-button:disabled { opacity: .4; cursor: not-allowed; }

.workspace-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin: 22px 0 48px; }
.workspace-card { text-align: left; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); display: grid; gap: 6px; }
.workspace-card:hover { border-color: var(--green); }
.workspace-icon { font-size: 22px; color: var(--green); }
.workspace-card strong { font-size: 16px; }
.workspace-card small { color: var(--muted); }

.reveal-btn { border: 0; border-radius: 6px; background: var(--green); color: #fff; padding: 10px 14px; font-weight: 600; margin: 10px 0; }
.reveal-panel { display: none; margin: 0 0 20px; padding: 16px; background: var(--surface); border-left: 3px solid var(--green); font-size: 14px; }
.reveal-panel.show { display: block; }
.solution-wrap h4 { margin-top: 22px; font-size: 15px; }
.solution-wrap h4:first-child { margin-top: 0; }

.exercise-pager { display: flex; justify-content: space-between; align-items: center; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); }
.zip-link { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 600; color: var(--green); text-decoration: none; white-space: nowrap; }
.zip-link:hover { text-decoration: underline; }

/* Agenda-driven slide grouping */
.agenda-hour-meta { color: var(--muted); font-size: 13px; margin: -4px 0 10px; }
.agenda-break { display: flex; align-items: center; gap: 12px; margin: 10px 0; color: var(--muted); font: 500 12px "IBM Plex Mono", monospace; letter-spacing: .06em; text-transform: uppercase; }
.agenda-break::before, .agenda-break::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* Slide deck */
.slide-toolbar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 8px; }
.slide-counter { font: 500 13px "IBM Plex Mono", monospace; color: var(--muted); }
.slide-jump { margin-left: auto; max-width: 320px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink); font-size: 13px; }
.slide-context { color: var(--muted); font-size: 13px; margin-bottom: 18px; }
.slide-card { padding: 28px clamp(20px, 4vw, 40px); border: 1px solid var(--line); border-radius: 14px; background: var(--surface); min-height: 260px; }
.slide-card h1 { font-size: clamp(24px, 3vw, 34px); margin-top: 0; }
.slide-body p { margin: 0 0 14px; }
.slide-body ul, .slide-body ol { margin: 0 0 14px; padding-left: 20px; }
.slide-body li { margin: 4px 0; }
.slide-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.slide-table th, .slide-table td { padding: 9px 11px; text-align: left; border: 1px solid var(--line); }
.slide-table th { background: color-mix(in srgb, var(--green) 10%, var(--surface)); }
.notes-panel { margin-top: 6px; }
.slide-nav-buttons { display: flex; justify-content: space-between; gap: 12px; margin-top: 26px; }

/* Assessment */
.tab-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 22px 0 14px; border-bottom: 1px solid var(--line); }
.tab-btn { border: 0; background: transparent; padding: 10px 4px; margin-right: 18px; font-weight: 600; color: var(--muted); border-bottom: 2px solid transparent; }
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }
.mode-switch { display: flex; gap: 8px; margin-bottom: 20px; }
.quiz-intro { font-size: 14px; color: var(--muted); margin-bottom: 16px; }
.quiz-result { padding: 20px; background: var(--sky); border-radius: var(--radius); }
.choice-list { display: grid; gap: 8px; margin: 10px 0 0; }
.choice-row { display: flex; align-items: flex-start; gap: 9px; padding: 9px 11px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); font-size: 14px; font-weight: 400; }
.scale-row { display: flex; gap: 10px; margin: 10px 0 0; }
.scale-choice { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 13px; color: var(--muted); }
.text-answer { width: 100%; margin-top: 8px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); color: var(--ink); }
.muted { color: var(--muted); }

/* Exercise/workshop self-check */
.selfcheck-form { display: grid; gap: 10px; padding: 18px; background: var(--sky); border-radius: var(--radius); margin: 14px 0 24px; }
.selfcheck-row { display: grid; grid-template-columns: minmax(0, 1fr) 200px; gap: 12px; align-items: center; }
.selfcheck-row label { font-size: 14px; }
.selfcheck-input-wrap { display: flex; align-items: center; gap: 8px; }
.selfcheck-input-wrap input { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); color: var(--ink); }
.selfcheck-unit { font-size: 13px; color: var(--muted); white-space: nowrap; }
.selfcheck-confirm { background: var(--surface); font-weight: 400; }
.selfcheck-confirm em { font-style: normal; color: var(--muted); }
.selfcheck-result { padding: 18px; background: var(--sky); border-radius: var(--radius); margin: 14px 0 24px; }
.selfcheck-result.pass { background: color-mix(in srgb, var(--green) 14%, var(--surface)); }
@media (max-width: 700px) { .selfcheck-row { grid-template-columns: 1fr; } }

@media (max-width: 700px) {
  .slide-jump { margin-left: 0; max-width: 100%; width: 100%; }
  .slide-card { padding: 20px; }
}

/* ---- Display density: Normal (default var) vs Compact ---- */
:root[data-density="compact"] { --line-height: 1.42; }
:root[data-density="compact"] .app { padding-top: clamp(20px, 3.5vw, 46px); padding-bottom: 56px; }
:root[data-density="compact"] p { margin: 0 0 9px; }
:root[data-density="compact"] h1 { margin: 6px 0 12px; }
:root[data-density="compact"] h2 { margin: 0 0 8px; }
:root[data-density="compact"] h3 { margin: 18px 0 6px; }
:root[data-density="compact"] .lede { font-size: 16px; }
:root[data-density="compact"] .hero { padding-bottom: 32px; }
:root[data-density="compact"] .hero-meta { margin-top: 16px; }
:root[data-density="compact"] .progress-wrap { margin-top: 22px; }
:root[data-density="compact"] .home-grid { padding: 32px 0; gap: 30px; }
:root[data-density="compact"] .chapter-row { padding: 10px 4px; }
:root[data-density="compact"] .principle { padding: 11px 0; }
:root[data-density="compact"] .chapter-header { margin-bottom: 26px; padding-bottom: 16px; }
:root[data-density="compact"] .content-grid { gap: 28px; }
:root[data-density="compact"] .learning { padding: 14px; }
:root[data-density="compact"] .learning li { margin: 3px 0; }
:root[data-density="compact"] .data-table th, :root[data-density="compact"] .data-table td { padding: 7px 10px; }
:root[data-density="compact"] .data-table { margin: 10px 0 16px; }
:root[data-density="compact"] .steps { margin: 10px 0 16px; }
:root[data-density="compact"] .steps li { padding-bottom: 12px; }
:root[data-density="compact"] .trap { margin: 14px 0; padding: 11px 14px; }
:root[data-density="compact"] .checklist { margin: 10px 0 16px; gap: 6px; }
:root[data-density="compact"] .check-item { padding: 7px 10px; }
:root[data-density="compact"] .quiz { margin-top: 20px; padding-top: 6px; }
:root[data-density="compact"] .side-note { padding: 13px; font-size: 13px; }
:root[data-density="compact"] .exercise-pager { margin-top: 20px; padding-top: 12px; }
:root[data-density="compact"] .solution-wrap h4 { margin-top: 14px; }
:root[data-density="compact"] .slide-card { padding: 18px clamp(16px, 3vw, 30px); min-height: unset; }
:root[data-density="compact"] .slide-body ul, :root[data-density="compact"] .slide-body ol { margin: 0 0 9px; }
:root[data-density="compact"] .slide-body li { margin: 2px 0; }
:root[data-density="compact"] .slide-nav-buttons { margin-top: 16px; }
:root[data-density="compact"] .reveal-btn { margin: 6px 0; }
:root[data-density="compact"] .reveal-panel { padding: 12px; margin: 0 0 12px; }
:root[data-density="compact"] .tab-row { margin: 14px 0 10px; }
:root[data-density="compact"] .choice-list { gap: 5px; }
:root[data-density="compact"] .choice-row { padding: 7px 10px; }
:root[data-density="compact"] .workspace-grid { margin: 14px 0 32px; gap: 10px; }
:root[data-density="compact"] .workspace-card { padding: 13px; gap: 3px; }
:root[data-density="compact"] .plan-grid { margin: 16px 0 28px; }
:root[data-density="compact"] .week { padding: 13px; min-height: unset; }

/* Result popup modal */
.modal-overlay { display: none; position: fixed; inset: 0; z-index: 20; background: rgba(10, 16, 12, .55); align-items: center; justify-content: center; padding: 24px; }
.modal-overlay.show { display: flex; }
.modal-box { position: relative; width: min(920px, 96%); max-height: 88vh; overflow-y: auto; background: var(--surface); color: var(--ink); border-radius: 14px; padding: 32px clamp(20px, 4vw, 44px); box-shadow: 0 24px 60px #0005; }
.modal-close { position: absolute; top: 14px; right: 14px; width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); color: var(--ink); font-size: 15px; }
.modal-box h2 { margin-top: 0; }
.modal-score { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 10px; background: var(--sky); font-size: 20px; font-weight: 700; margin: 8px 0 18px; }
.modal-score.pass { background: color-mix(in srgb, var(--green) 16%, var(--surface)); color: var(--green-dark); }
.field.required label::after { content: " *"; color: var(--red); }

/* Mandatory name gate — blocks the whole app until a first+last name is entered */
.name-gate-overlay { display: none; position: fixed; inset: 0; z-index: 40; background: rgba(10, 16, 12, .82); align-items: center; justify-content: center; padding: 24px; }
.name-gate-overlay.show { display: flex; }
.name-gate-box { width: min(420px, 100%); background: var(--surface); color: var(--ink); border-radius: 16px; padding: 36px 30px; text-align: center; box-shadow: 0 24px 60px #0006; }
.name-gate-mascot { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; margin-bottom: 14px; }
.name-gate-box h2 { font-size: 20px; margin: 0 0 8px; }
.name-gate-box .lede { font-size: 14px; margin: 0 0 20px; }
.name-gate-box input { width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 7px; background: var(--paper); color: var(--ink); font-size: 15px; text-align: center; }
.name-gate-box .primary-button { width: 100%; margin-top: 14px; padding: 11px; font-size: 15px; }
.name-gate-error { color: var(--red); font-size: 13px; margin: 8px 0 0; }

/* Handbook PDF export */
.pdf-download-btn { display: inline-flex; align-items: center; gap: 7px; }
.pdf-export-root { position: fixed; left: -99999px; top: 0; width: 780px; background: #fff; color: #161616; font-family: "IBM Plex Sans Thai", system-ui, sans-serif; }
.pdf-export-root, .pdf-export-root * { line-height: 1.22 !important; }
.pdf-export-root .chapter-header { display: block; margin: 0 0 8px; padding: 0 0 8px; border-bottom: 1px solid #ccc; page-break-before: always; }
.pdf-export-root .chapter-header:first-child { page-break-before: avoid; }
.pdf-export-root .chapter-no { display: none; }
.pdf-export-root .eyebrow { font-size: 10px; }
.pdf-export-root h1 { font-size: 19px; margin: 4px 0 6px; }
.pdf-export-root h2 { font-size: 15px; margin: 10px 0 4px; }
.pdf-export-root h3 { font-size: 13px; margin: 8px 0 3px; }
.pdf-export-root p, .pdf-export-root li { font-size: 11px; }
.pdf-export-root .lede { font-size: 12px; }
.pdf-export-root .content-grid { display: block; }
.pdf-export-root .side-note { display: none; }
.pdf-export-root .learning { padding: 8px 10px; margin-bottom: 6px; }
.pdf-export-root .learning li { margin: 1px 0; }
.pdf-export-root .steps { margin: 6px 0 10px; }
.pdf-export-root .steps li { padding: 0 0 6px 34px; }
.pdf-export-root .steps li::before { width: 20px; height: 20px; font-size: 10px; }
.pdf-export-root .data-table { margin: 8px 0 10px; font-size: 10px; }
.pdf-export-root .data-table th, .pdf-export-root .data-table td { padding: 4px 6px; }
.pdf-export-root .trap { margin: 8px 0; padding: 8px 10px; }
.pdf-export-root .checklist { display: none; }
.pdf-export-root .quiz { margin-top: 10px; padding-top: 4px; }
.pdf-export-root .reveal-answer { display: none; }
.pdf-export-root .quiz-answer { display: block !important; margin-top: 4px; padding: 8px 10px; font-size: 11px; }
.pdf-export-root .pdf-download-btn { display: none; }
/* html2canvas can't parse color-mix(); pin these to plain equivalents for the export copy */
.pdf-export-root .data-table th { background: #e3f1e9; }
.pdf-export-root .trap { border-color: #e8a99c; background: #fdf1ee; }
.pdf-export-root .side-note { background: #eef7d9; }

/* Class Agenda — colors match the source Excel's schedule table */
.agenda-table-wrap { overflow-x: auto; margin: 22px 0 20px; border-radius: 8px; }
.agenda-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 13px; background: #fff; }
.agenda-table th { background: #9fc5e8; color: #12233c; font-weight: 700; padding: 12px 14px; text-align: left; border: 1px solid #82add4; }
.agenda-table td { padding: 10px 14px; border: 1px solid #d8dee3; vertical-align: top; color: #23272b; }
.agenda-session-cell { text-align: center; vertical-align: middle; font-size: 13px; min-width: 150px; }
.agenda-session-cell small { display: block; color: #4b5259; font-weight: 400; font-size: 11px; margin-top: 3px; }
.agenda-hour-cell { color: #0563c1; font-weight: 700; white-space: nowrap; }
.agenda-hour-link { cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.agenda-hour-link:hover { background: #ffffffaa; color: #033b8a; }
.agenda-duration-cell { white-space: nowrap; color: #4b5259; font-size: 12px; }
.agenda-table tr.agenda-session-a td { background: #fbe5d6; }
.agenda-table tr.agenda-session-b td { background: #deebf7; }
.agenda-table tr.agenda-break-row td { background: #d9d9d9 !important; color: #595959; font-style: italic; text-align: center; }
.agenda-legend { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; color: var(--muted); }
.agenda-legend span { display: inline-flex; align-items: center; gap: 7px; }
.agenda-swatch { width: 14px; height: 14px; border-radius: 3px; display: inline-block; border: 1px solid #0002; }
.agenda-swatch.agenda-session-a { background: #fbe5d6; }
.agenda-swatch.agenda-session-b { background: #deebf7; }
.agenda-swatch-break { background: #d9d9d9; }