/* AKB-Elearning — base theme (Bootstrap 5.3 + tokens) */
:root {
  --akb-primary: #2f5bea;
  --akb-primary-rgb: 47, 91, 234;
  --akb-accent: #f59e0b;
  --akb-success: #16a34a;
  --akb-danger: #dc2626;
  --akb-bg: #f4f6fb;
  --akb-surface: #ffffff;
  --akb-surface-2: #f8f9fd;
  --akb-border: #e5e8f0;
  --akb-text: #1f2533;
  --akb-muted: #6b7385;
  --akb-sidebar-w: 260px;
  --akb-radius: 14px;
  --akb-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 14px rgba(16, 24, 40, .06);
  --akb-glass: rgba(255, 255, 255, .72);
  --bs-body-font-family: "Sarabun", system-ui, -apple-system, "Segoe UI", sans-serif;
  --bs-primary: var(--akb-primary);
  --bs-primary-rgb: var(--akb-primary-rgb);
  --bs-link-color: var(--akb-primary);
  --bs-link-color-rgb: var(--akb-primary-rgb);
}
[data-bs-theme="dark"] {
  --akb-primary: #6d8cff;
  --akb-primary-rgb: 109, 140, 255;
  --akb-bg: #0f1420;
  --akb-surface: #171d2b;
  --akb-surface-2: #1d2434;
  --akb-border: #2a3245;
  --akb-text: #e6e9f2;
  --akb-muted: #98a1b5;
  --akb-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 18px rgba(0, 0, 0, .25);
  --akb-glass: rgba(23, 29, 43, .72);
  --bs-body-bg: var(--akb-bg);
  --bs-body-color: var(--akb-text);
}

body { background: var(--akb-bg); color: var(--akb-text); font-size: 1.02rem; line-height: 1.6; }
h1, h2, h3, h4, h5, .akb-brand, .akb-heading { font-family: "Prompt", var(--bs-body-font-family); font-weight: 600; }
.text-muted, .akb-muted { color: var(--akb-muted) !important; }
a { text-decoration: none; }
.btn { border-radius: 10px; font-weight: 500; }
.btn-primary { --bs-btn-bg: var(--akb-primary); --bs-btn-border-color: var(--akb-primary); --bs-btn-hover-bg: #2449c9; --bs-btn-hover-border-color: #2449c9; }
.form-control, .form-select { border-radius: 10px; padding: .6rem .85rem; }
.form-control:focus { border-color: var(--akb-primary); box-shadow: 0 0 0 .2rem rgba(var(--akb-primary-rgb), .18); }

/* ---------- App shell ---------- */
.akb-sidebar {
  position: fixed; inset: 0 auto 0 0; width: var(--akb-sidebar-w); z-index: 1040;
  background: var(--akb-surface); border-right: 1px solid var(--akb-border);
  display: flex; flex-direction: column;
}
.akb-sidebar .akb-brand { display: flex; align-items: center; gap: .65rem; padding: 1.1rem 1.25rem; color: var(--akb-text); font-size: 1.15rem; }
.akb-logo { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; color: #fff; font-size: 1.2rem;
  background: linear-gradient(135deg, var(--akb-primary), #7c4dff); box-shadow: 0 6px 14px rgba(var(--akb-primary-rgb), .35); }
.akb-brand small { display: block; font-family: var(--bs-body-font-family); font-weight: 400; font-size: .74rem; color: var(--akb-muted); }
.akb-nav { overflow-y: auto; padding: .25rem .75rem 1rem; flex: 1; }
.akb-nav-group { font-size: .74rem; letter-spacing: .04em; text-transform: uppercase; color: var(--akb-muted); padding: 1rem .75rem .35rem; }
.akb-nav a, .akb-nav .akb-nav-soon {
  display: flex; align-items: center; gap: .7rem; padding: .55rem .75rem; border-radius: 10px;
  color: var(--akb-text); font-weight: 500; margin-bottom: 2px;
}
.akb-nav a i, .akb-nav .akb-nav-soon i { font-size: 1.1rem; width: 1.25rem; text-align: center; color: var(--akb-muted); }
.akb-nav a:hover { background: var(--akb-surface-2); }
.akb-nav a.active { background: rgba(var(--akb-primary-rgb), .1); color: var(--akb-primary); }
.akb-nav a.active i { color: var(--akb-primary); }
.akb-nav .akb-nav-soon { color: var(--akb-muted); cursor: default; }
.akb-nav .akb-nav-soon .badge { margin-left: auto; font-weight: 500; background: var(--akb-surface-2); color: var(--akb-muted); border: 1px solid var(--akb-border); }

.akb-main { margin-left: var(--akb-sidebar-w); min-height: 100vh; display: flex; flex-direction: column; }
.akb-topbar {
  position: sticky; top: 0; z-index: 1030; display: flex; align-items: center; gap: .75rem;
  padding: .7rem 1.5rem; background: var(--akb-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--akb-border);
}
.akb-content { padding: 1.5rem; flex: 1; }
.akb-footer { padding: 1rem 1.5rem; color: var(--akb-muted); font-size: .85rem; }
.akb-avatar { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; font-weight: 600;
  background: rgba(var(--akb-primary-rgb), .12); color: var(--akb-primary); }
.akb-icon-btn { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; border: 1px solid var(--akb-border);
  background: var(--akb-surface); color: var(--akb-text); }
.akb-icon-btn:hover { background: var(--akb-surface-2); }

@media (max-width: 991.98px) {
  .akb-sidebar { transform: translateX(-100%); transition: transform .2s ease; }
  .akb-sidebar.show { transform: none; box-shadow: var(--akb-shadow); }
  .akb-main { margin-left: 0; }
  .akb-content { padding: 1rem; }
  .akb-topbar { padding: .6rem 1rem; }
  .akb-backdrop { position: fixed; inset: 0; background: rgba(0, 0, 0, .35); z-index: 1035; display: none; }
  .akb-backdrop.show { display: block; }
}

/* ---------- Cards ---------- */
.akb-card { background: var(--akb-surface); border: 1px solid var(--akb-border); border-radius: var(--akb-radius); box-shadow: var(--akb-shadow); }
.akb-card-header { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: 1rem 1.25rem .5rem; }
.akb-card-header h2 { font-size: 1.05rem; margin: 0; }
.akb-card-body { padding: .5rem 1.25rem 1.25rem; }

.akb-stat { padding: 1.1rem 1.25rem; display: flex; gap: 1rem; align-items: center; height: 100%; }
.akb-stat-icon { width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center; font-size: 1.35rem; flex: none; }
.akb-stat-value { font-family: "Prompt", sans-serif; font-size: 1.6rem; font-weight: 600; line-height: 1.1; }
.akb-stat-label { color: var(--akb-muted); font-size: .9rem; }
.tone-blue { background: rgba(47, 91, 234, .12); color: #2f5bea; }
.tone-green { background: rgba(22, 163, 74, .12); color: #16a34a; }
.tone-amber { background: rgba(245, 158, 11, .15); color: #c27803; }
.tone-violet { background: rgba(124, 77, 255, .13); color: #7c4dff; }
.tone-rose { background: rgba(225, 29, 72, .12); color: #e11d48; }
[data-bs-theme="dark"] .tone-blue { color: #8aa4ff; }
[data-bs-theme="dark"] .tone-amber { color: #fbbf24; }
[data-bs-theme="dark"] .tone-violet { color: #b39dff; }

.akb-hero {
  border-radius: var(--akb-radius); padding: 1.5rem; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(120deg, #2f5bea 0%, #5b3df5 60%, #7c4dff 100%);
}
.akb-hero::after { content: ""; position: absolute; right: -60px; top: -60px; width: 240px; height: 240px; border-radius: 50%; background: rgba(255, 255, 255, .09); }
.akb-hero h1 { font-size: 1.45rem; margin-bottom: .25rem; }
.akb-hero .btn-light { color: #2f5bea; }
.akb-chip { display: inline-flex; align-items: center; gap: .35rem; padding: .2rem .65rem; border-radius: 999px; font-size: .82rem; background: rgba(255, 255, 255, .18); }

.akb-shortcut { display: flex; flex-direction: column; align-items: flex-start; gap: .5rem; padding: 1rem; border-radius: 12px;
  border: 1px dashed var(--akb-border); background: var(--akb-surface-2); color: var(--akb-muted); height: 100%; }
.akb-shortcut i { font-size: 1.3rem; }
.akb-shortcut strong { color: var(--akb-text); font-weight: 600; }

.akb-list { list-style: none; margin: 0; padding: 0; }
.akb-list li { display: flex; gap: .75rem; align-items: center; padding: .7rem 0; border-bottom: 1px solid var(--akb-border); }
.akb-list li:last-child { border-bottom: 0; }
.akb-time { font-family: "Prompt", sans-serif; font-weight: 600; min-width: 92px; color: var(--akb-primary); font-size: .92rem; }

.akb-week { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .5rem; }
.akb-week-day { background: var(--akb-surface-2); border-radius: 10px; padding: .6rem; min-height: 120px; }
.akb-week-day.today { outline: 2px solid rgba(var(--akb-primary-rgb), .45); }
.akb-week-day h3 { font-size: .85rem; margin-bottom: .4rem; color: var(--akb-muted); }
.akb-slot { background: var(--akb-surface); border-left: 3px solid var(--akb-primary); border-radius: 6px; padding: .3rem .45rem; font-size: .8rem; margin-bottom: .35rem; }
@media (max-width: 767.98px) { .akb-week { grid-template-columns: 1fr; } .akb-week-day { min-height: 0; } }

.akb-empty { text-align: center; padding: 1.5rem .5rem; color: var(--akb-muted); }
.akb-empty i { font-size: 2rem; display: block; margin-bottom: .35rem; opacity: .6; }

.akb-course { display: flex; gap: .85rem; align-items: center; padding: .75rem; border-radius: 12px; border: 1px solid var(--akb-border); background: var(--akb-surface); height: 100%; }
.akb-course-cover { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; font-size: 1.4rem; flex: none; }
.akb-progress { height: 6px; border-radius: 99px; background: var(--akb-surface-2); }
.akb-progress > span { display: block; height: 100%; border-radius: 99px; background: var(--akb-primary); }

/* ---------- Auth / public ---------- */
.akb-auth { min-height: 100vh; display: grid; place-items: center; padding: 1.5rem 1rem;
  background: radial-gradient(1200px 600px at 10% -10%, rgba(var(--akb-primary-rgb), .18), transparent 60%),
              radial-gradient(900px 500px at 110% 110%, rgba(124, 77, 255, .16), transparent 60%), var(--akb-bg); }
.akb-auth-card { width: 100%; max-width: 420px; padding: 2rem; background: var(--akb-glass); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }

.akb-public-nav { background: var(--akb-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--akb-border); }
.akb-public-hero { padding: 3.5rem 0 2.5rem; }
.akb-public-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.akb-feature { padding: 1.25rem; height: 100%; }

/* ---------- Set 2: course / lesson management ---------- */
.min-w-0 { min-width: 0; }
.akb-page-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: 1.25rem; }
.akb-course-card { padding: 1rem 1.1rem; color: inherit; transition: transform .15s ease, box-shadow .15s ease; }
.akb-course-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(16, 24, 40, .1); }

.akb-section-head { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; padding: .9rem 1.1rem; border-bottom: 1px solid var(--akb-border); background: var(--akb-surface-2); border-radius: var(--akb-radius) var(--akb-radius) 0 0; }
.akb-lesson-list { list-style: none; margin: 0; padding: .25rem 1.1rem .75rem; }
.akb-lesson-list li { display: flex; gap: .75rem; align-items: center; padding: .6rem 0; border-bottom: 1px dashed var(--akb-border); }
.akb-lesson-list li:last-child { border-bottom: 0; }
.akb-lesson-no { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; flex: none; font-size: .85rem; font-weight: 600;
  background: rgba(var(--akb-primary-rgb), .1); color: var(--akb-primary); }
.akb-lesson-add { padding-top: .75rem !important; }
.akb-section { scroll-margin-top: 80px; }
#resources { scroll-margin-top: 80px; }

.ck-editor__editable_inline { min-height: 320px; }
[data-bs-theme="dark"] .ck.ck-editor__main > .ck-editor__editable { background: var(--akb-surface-2); color: var(--akb-text); }
[data-bs-theme="dark"] .ck.ck-toolbar { background: var(--akb-surface); border-color: var(--akb-border); }
[data-bs-theme="dark"] .ck.ck-button, [data-bs-theme="dark"] .ck.ck-toolbar .ck-button__label { color: var(--akb-text); }

.akb-lesson-content { font-size: 1.08rem; line-height: 1.8; }
.akb-lesson-content h2 { font-size: 1.4rem; margin-top: 1.5rem; }
.akb-lesson-content h3 { font-size: 1.2rem; margin-top: 1.25rem; }
.akb-lesson-content h4 { font-size: 1.05rem; margin-top: 1rem; }
.akb-lesson-content img { max-width: 100%; height: auto; border-radius: 8px; }
.akb-lesson-content table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.akb-lesson-content th, .akb-lesson-content td { border: 1px solid var(--akb-border); padding: .45rem .6rem; }
.akb-lesson-content blockquote { border-left: 4px solid var(--akb-primary); padding: .25rem 1rem; color: var(--akb-muted); background: var(--akb-surface-2); border-radius: 0 8px 8px 0; }
.akb-video { border-radius: 12px; overflow: hidden; background: #000; }
.akb-pdf { width: 100%; height: 70vh; min-height: 420px; border: 1px solid var(--akb-border); border-radius: 10px; }
.akb-resource-link { display: flex; align-items: center; gap: .75rem; padding: .75rem 1rem; border: 1px solid var(--akb-border); border-radius: 12px; color: var(--akb-text); background: var(--akb-surface-2); }
.akb-resource-link:hover { border-color: var(--akb-primary); }

.akb-week-lg .akb-week-day { min-height: 200px; }
.akb-slot-btn { display: block; width: 100%; text-align: left; border-top: 0; border-right: 0; border-bottom: 0; cursor: pointer; color: var(--akb-text); }
.akb-slot-btn:hover { box-shadow: var(--akb-shadow); }
.swal2-html-container { white-space: pre-line; }
.akb-shortcut-on { border-style: solid; color: var(--akb-primary); background: rgba(var(--akb-primary-rgb), .06); }
.akb-shortcut-on:hover { border-color: var(--akb-primary); background: rgba(var(--akb-primary-rgb), .12); }

/* ---------- Set 4: assignments / quizzes / gradebook ---------- */
@media (min-width: 992px) { .akb-sticky { position: sticky; top: 84px; } }
.akb-quiz-bar { position: sticky; top: 64px; z-index: 1020; display: flex; align-items: center; gap: 1rem; max-width: 820px; margin-left: auto; margin-right: auto; }
.akb-timer { font-family: "Prompt", sans-serif; font-size: 1.35rem; font-weight: 600; color: var(--akb-primary); white-space: nowrap; }
.akb-timer-low { color: var(--akb-danger); animation: akb-blink 1s steps(2) infinite; }
@keyframes akb-blink { 50% { opacity: .45; } }
@media (prefers-reduced-motion: reduce) { .akb-timer-low { animation: none; } }
.akb-choice { padding: .6rem .75rem .6rem 2.25rem; border: 1px solid var(--akb-border); border-radius: 10px; margin-bottom: .5rem; }
.akb-choice:has(input:checked) { border-color: var(--akb-primary); background: rgba(var(--akb-primary-rgb), .07); }
.akb-choice .form-check-label { width: 100%; cursor: pointer; }
.akb-gradebook { max-height: 70vh; }
.akb-gradebook thead th { position: sticky; top: 0; background: var(--akb-surface); z-index: 2; }
.akb-sticky-col { position: sticky; left: 0; background: var(--akb-surface); z-index: 1; }
.akb-gradebook thead .akb-sticky-col { z-index: 3; }
@media print {
  .akb-sidebar, .akb-topbar, .akb-footer, .breadcrumb, .akb-page-head, .akb-print-area ~ *, .d-print-none { display: none !important; }
  .akb-main { margin: 0; } .akb-content { padding: 0; } .akb-card { box-shadow: none; }
}

/* ---------- Set 3: student learning ---------- */
.akb-lesson-no.akb-done { background: var(--akb-success); color: #fff; }
.akb-lesson-no.akb-doing { background: var(--akb-primary); color: #fff; }
.akb-outline { max-height: 65vh; overflow-y: auto; }
.akb-outline-item { display: flex; gap: .5rem; align-items: center; padding: .4rem .5rem; border-radius: 8px; color: var(--akb-text); font-size: .95rem; }
.akb-outline-item:hover { background: var(--akb-surface-2); }
.akb-outline-item.active { background: rgba(var(--akb-primary-rgb), .1); color: var(--akb-primary); font-weight: 600; }

/* ---------- Course covers ---------- */
.akb-cover { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 12px; background: var(--akb-surface-2); }
.akb-cover-fallback { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; flex-direction: column; color: #fff; gap: .25rem; }
.akb-cover-fallback i { font-size: clamp(1.6rem, 6vw, 3.2rem); opacity: .95; }
.akb-cover-fallback span { font-family: "Prompt", sans-serif; font-weight: 600; letter-spacing: .05em; opacity: .9; font-size: .95rem; }
.akb-cover-fallback::before, .akb-cover-fallback::after { content: ""; position: absolute; border-radius: 50%; background: rgba(255, 255, 255, .12); }
.akb-cover-fallback::before { width: 60%; aspect-ratio: 1; right: -18%; top: -30%; }
.akb-cover-fallback::after { width: 40%; aspect-ratio: 1; left: -12%; bottom: -25%; }
.cover-sci { background: linear-gradient(135deg, #2f5bea, #7c4dff); }
.cover-math { background: linear-gradient(135deg, #0ea5e9, #2563eb); }
.cover-lang { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.cover-thai { background: linear-gradient(135deg, #db2777, #9333ea); }
.cover-social { background: linear-gradient(135deg, #059669, #0d9488); }
.cover-health { background: linear-gradient(135deg, #e11d48, #f97316); }
.cover-arts { background: linear-gradient(135deg, #c026d3, #f43f5e); }
.cover-career { background: linear-gradient(135deg, #78716c, #a16207); }
.cover-default { background: linear-gradient(135deg, #475569, #2f5bea); }
.akb-cover-sm { width: 96px; flex: none; border-radius: 10px; }
.akb-cover-sm.akb-cover-fallback i { font-size: 1.4rem; }
.akb-cover-sm.akb-cover-fallback span, .akb-cover-sm.akb-cover-fallback::before, .akb-cover-sm.akb-cover-fallback::after { display: none; }
.akb-card-cover { border-radius: var(--akb-radius) var(--akb-radius) 0 0; }
.akb-hero-cover { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .28; border-radius: 0; aspect-ratio: auto; }
.akb-lock { color: var(--akb-muted); }
.akb-section.is-locked { opacity: .72; }
.akb-section.is-locked .akb-section-head { background: repeating-linear-gradient(-45deg, var(--akb-surface-2), var(--akb-surface-2) 10px, transparent 10px, transparent 20px); }
.akb-criteria { list-style: none; padding: 0; margin: .5rem 0 0; }
.akb-criteria li { display: flex; gap: .5rem; align-items: baseline; font-size: .92rem; padding: .15rem 0; }

/* ---------- Video gate ---------- */
.akb-watchbar { position: relative; height: 8px; border-radius: 99px; background: var(--akb-surface-2); border: 1px solid var(--akb-border); }
.akb-watchbar-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; border-radius: 99px; background: var(--akb-success); transition: width .4s ease; }
.akb-watchbar-cp { position: absolute; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; background: var(--akb-accent); border: 2px solid var(--akb-surface); }
.akb-watchbar-cp.done { background: var(--akb-success); }
.swal2-radio.akb-cp-options { flex-direction: column; align-items: flex-start; gap: .4rem; padding: 0 1.5rem; }
.swal2-radio.akb-cp-options label { margin: 0 !important; text-align: left; }

/* ---------- Home banner slider ---------- */
.akb-banner { border-radius: var(--akb-radius); overflow: hidden; box-shadow: var(--akb-shadow); background: var(--akb-surface-2); }
.akb-banner-img { display: block; width: 100%; aspect-ratio: 3 / 1; object-fit: cover; }
.akb-banner-caption { position: absolute; left: 0; right: 0; bottom: 0; padding: 3rem 2rem 2.6rem; color: #fff;
  background: linear-gradient(to top, rgba(0, 0, 0, .62), rgba(0, 0, 0, 0)); }
.akb-banner-caption h2 { font-size: clamp(1.1rem, 2.6vw, 2rem); margin: 0 0 .25rem; text-shadow: 0 2px 8px rgba(0, 0, 0, .35); }
.akb-banner-caption p { margin: 0 0 .6rem; opacity: .92; max-width: 640px; }
.akb-banner .carousel-indicators { margin-bottom: .6rem; }
.akb-banner .carousel-indicators [data-bs-target] { width: 22px; height: 4px; border-radius: 4px; }
@media (max-width: 767.98px) {
  .akb-banner-img { aspect-ratio: 16 / 9; }
  .akb-banner-caption { padding: 2rem 1rem 2rem; }
  .akb-banner-caption p { display: none; }
}
.akb-banner-thumb { display: block; width: 100%; aspect-ratio: 16 / 5; object-fit: cover; border-radius: var(--akb-radius) var(--akb-radius) 0 0; }
.akb-banner-preview { position: relative; border-radius: 12px; overflow: hidden; background: var(--akb-surface-2); border: 1px dashed var(--akb-border); }
.akb-banner-preview img, .akb-banner-empty { display: block; width: 100%; aspect-ratio: 16 / 5; object-fit: cover; }
.akb-banner-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--akb-muted); gap: .25rem; }
.akb-banner-empty i { font-size: 2rem; }
.akb-banner-caption-preview { position: absolute; left: 0; right: 0; bottom: 0; padding: 1.5rem 1rem .8rem; color: #fff; background: linear-gradient(to top, rgba(0,0,0,.55), transparent); pointer-events: none; }
.akb-banner-caption-preview:has(#pvTitle:empty):has(#pvSub:empty) { display: none; }

/* ---------- Quiz: question form (images, drag zones, sortable lists) ---------- */
.akb-qtypes { display: flex; flex-wrap: wrap; gap: .35rem; }
.akb-qtypes .btn { border-radius: 999px; }
.qimg { position: relative; }
.qimg-main { border: 2px dashed var(--akb-border); border-radius: 14px; background: var(--akb-surface-2); padding: .75rem; text-align: center; color: var(--akb-muted); transition: border-color .15s, background .15s; }
.qimg-main.has-img { border-style: solid; text-align: left; }
.qimg-main img { display: block; max-width: 100%; max-height: 320px; margin: 0 auto .5rem; border-radius: 10px; }
.qimg-tools { display: flex; gap: .4rem; justify-content: center; }
.qimg.is-drop { border-color: var(--akb-primary); background: rgba(var(--akb-primary-rgb), .08); }
.qimg.is-uploading { opacity: .6; pointer-events: none; }
.qimg.is-uploading::after { content: "กำลังอัปโหลด..."; position: absolute; inset: 0; display: grid; place-items: center; font-size: .85rem; color: var(--akb-text); background: rgba(255, 255, 255, .5); border-radius: inherit; }
.qimg-mini { display: inline-flex; align-items: center; }
.qimg-mini .qimg-btn { width: 34px; height: 30px; padding: 0; display: grid; place-items: center; overflow: hidden; }
.qimg-mini .qimg-btn img { width: 100%; height: 100%; object-fit: cover; }
.qimg-mini .qimg-clear { position: absolute; top: -6px; right: -6px; width: 18px; height: 18px; padding: 0; border: 0; border-radius: 50%; background: var(--akb-danger); color: #fff; font-size: .75rem; line-height: 1; display: grid; place-items: center; }
.sort-handle { cursor: grab; touch-action: none; }
[data-row].is-dragging { opacity: .6; }
.dd-stage { position: relative; border-radius: 12px; overflow: hidden; background: var(--akb-surface-2); border: 1px solid var(--akb-border); user-select: none; touch-action: none; }
.dd-stage img { display: block; width: 100%; height: auto; }
.dd-noimg { padding: 2rem; text-align: center; color: var(--akb-muted); }
.dd-zone { position: absolute; border: 2px dashed var(--akb-primary); background: rgba(var(--akb-primary-rgb), .18); border-radius: 8px; cursor: move; display: flex; align-items: center; justify-content: center; gap: .25rem; font-size: .8rem; font-weight: 600; color: var(--akb-text); overflow: hidden; }
.dd-zone.is-active { background: rgba(var(--akb-primary-rgb), .3); }
.dd-zone-no { position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--akb-primary); color: #fff; font-size: .7rem; display: grid; place-items: center; }
.dd-zone-label { padding: 0 .3rem; text-shadow: 0 0 3px #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dd-resize { position: absolute; right: 0; bottom: 0; width: 14px; height: 14px; cursor: nwse-resize; background: linear-gradient(135deg, transparent 50%, var(--akb-primary) 50%); }
.dd-no { min-width: 2.2rem; justify-content: center; font-weight: 600; }
.akb-bankbox { border: 1px solid var(--akb-border); background: var(--akb-surface-2); border-radius: 12px; padding: .75rem; }

/* question preview (teacher) */
.qp-img { max-width: 100%; max-height: 260px; border-radius: 10px; border: 1px solid var(--akb-border); }
.qp-img-opt { max-width: 180px; max-height: 120px; border-radius: 8px; border: 1px solid var(--akb-border); }
.qp-img-sm { width: 44px; height: 44px; object-fit: cover; border-radius: 6px; border: 1px solid var(--akb-border); vertical-align: middle; }
.dd-preview { position: relative; max-width: 560px; border-radius: 10px; overflow: hidden; border: 1px solid var(--akb-border); }
.dd-preview-zone { position: absolute; border: 2px solid #16a34a; background: rgba(22, 163, 74, .2); border-radius: 6px; font-size: .75rem; font-weight: 600; color: #0b4d24; display: flex; align-items: center; justify-content: center; text-align: center; line-height: 1.1; padding: 1px; overflow: hidden; text-shadow: 0 0 3px #fff; }
.dd-preview-zone.is-bad { border-color: #dc2626; background: rgba(220, 38, 38, .18); color: #7f1d1d; }

/* ---------- Quiz: student play ---------- */
.q-img { max-width: 100%; max-height: 380px; border-radius: 12px; border: 1px solid var(--akb-border); }
.q-img-sm { max-height: 220px; }
.play-pics { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: .6rem; }
.akb-choice-pic { margin: 0; padding: .5rem .5rem .5rem 2rem; height: 100%; }
.akb-choice-pic .form-check-label { display: flex; flex-direction: column; gap: .35rem; }
.choice-img { width: 100%; max-height: 150px; object-fit: contain; border-radius: 8px; background: var(--akb-surface-2); }
.akb-choice:not(.akb-choice-pic) .choice-img { display: block; max-width: 220px; margin-top: .35rem; }
.play-stage { position: relative; border-radius: 12px; overflow: hidden; border: 1px solid var(--akb-border); max-width: 760px; margin: 0 auto .75rem; user-select: none; }
.play-stage-img { display: block; width: 100%; height: auto; pointer-events: none; }
.play-zone { position: absolute; border: 2px dashed var(--akb-primary); background: rgba(255, 255, 255, .55); border-radius: 8px; display: flex; align-items: center; justify-content: center; padding: 2px; transition: background .15s, transform .15s; }
.play-zone.is-filled { border-style: solid; background: rgba(255, 255, 255, .85); }
.play-zone-no { position: absolute; top: -9px; left: -9px; width: 20px; height: 20px; border-radius: 50%; background: var(--akb-primary); color: #fff; font-size: .72rem; font-weight: 700; display: grid; place-items: center; }
.play-zone .play-chip { font-size: .82rem; padding: .2rem .5rem; max-width: 100%; }
.play-bank { display: flex; flex-wrap: wrap; gap: .5rem; min-height: 56px; padding: .6rem; border: 2px dashed var(--akb-border); border-radius: 14px; background: var(--akb-surface-2); }
.play-chip { border: 2px solid rgba(var(--akb-primary-rgb), .35); background: var(--akb-surface); color: var(--akb-text); border-radius: 999px; padding: .4rem .9rem; font-weight: 600; cursor: grab; touch-action: none; box-shadow: 0 2px 0 rgba(0, 0, 0, .08); transition: transform .12s; }
.play-chip:hover { transform: translateY(-1px); }
.play-chip.is-selected { border-color: var(--akb-primary); background: rgba(var(--akb-primary-rgb), .14); box-shadow: 0 0 0 3px rgba(var(--akb-primary-rgb), .25); }
.play-chip.is-dragging { opacity: .35; }
.play-ghost { position: fixed; z-index: 2000; pointer-events: none; transform: translate(-50%, -60%) rotate(-3deg); box-shadow: 0 10px 24px rgba(0, 0, 0, .25); }
.is-picking .play-zone, .is-picking .play-slot { animation: play-pulse 1.2s ease-in-out infinite; }
.play-zone.is-over, .play-slot.is-over { background: rgba(var(--akb-primary-rgb), .22); transform: scale(1.04); }
.play-bank.is-over { border-color: var(--akb-primary); }
@keyframes play-pulse { 50% { box-shadow: 0 0 0 4px rgba(var(--akb-primary-rgb), .25); } }
.play-match { display: grid; gap: .5rem; margin-bottom: .75rem; }
.play-pair { display: grid; grid-template-columns: 1fr auto 1fr; gap: .5rem; align-items: center; }
.play-left { display: flex; align-items: center; gap: .5rem; padding: .5rem .75rem; border-radius: 12px; background: var(--akb-surface-2); border: 1px solid var(--akb-border); font-weight: 600; min-height: 48px; }
.play-arrow { color: var(--akb-muted); }
.play-slot { min-height: 48px; border: 2px dashed var(--akb-border); border-radius: 12px; display: flex; align-items: center; padding: .25rem .4rem; }
.play-slot.is-filled { border-style: solid; border-color: rgba(var(--akb-primary-rgb), .5); }
.play-slot-hint { color: var(--akb-muted); font-size: .85rem; padding-left: .3rem; }
.play-slot.is-filled .play-slot-hint { display: none; }
.play-card-img { width: 56px; height: 56px; object-fit: cover; border-radius: 8px; margin-right: .5rem; vertical-align: middle; }
.play-order { list-style: none; padding: 0; margin: 0; display: grid; gap: .45rem; }
.play-card { display: flex; align-items: center; gap: .6rem; padding: .5rem .6rem; border: 2px solid var(--akb-border); border-radius: 12px; background: var(--akb-surface); }
.play-card.is-dragging { border-color: var(--akb-primary); box-shadow: 0 8px 20px rgba(0, 0, 0, .15); }
.play-grip { cursor: grab; touch-action: none; color: var(--akb-muted); font-size: 1.2rem; padding: .25rem; }
.play-num { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; flex: none; font-weight: 700; background: rgba(var(--akb-primary-rgb), .12); color: var(--akb-primary); }
@media (max-width: 575.98px) { .play-pair { grid-template-columns: 1fr; } .play-arrow { display: none; } }
@media (prefers-reduced-motion: reduce) { .is-picking .play-zone, .is-picking .play-slot { animation: none; } }

/* ---------- Bank ---------- */
.akb-filter .form-label { color: var(--akb-muted); }
.bank-item { cursor: default; }
.bank-item.is-in { opacity: .65; }
.bank-item.is-picked { outline: 2px solid var(--akb-primary); }
#bankPick .bank-item { cursor: pointer; }
.bank-pickbar { position: sticky; bottom: 12px; z-index: 20; display: flex; align-items: center; gap: .6rem; padding: .6rem .9rem; margin-top: .75rem; box-shadow: 0 8px 24px rgba(0, 0, 0, .15); }

/* ---------- Item analysis ---------- */
.ia-chip { display: inline-flex; align-items: center; gap: .3rem; padding: .08rem .55rem; border-radius: 999px; font-size: .78rem; font-weight: 600; border: 1px solid transparent; white-space: nowrap; }
.ia-good { --ia: #0ca30c; } .ia-warning { --ia: #c98a00; } .ia-serious { --ia: #d0632f; } .ia-critical { --ia: #d03b3b; } .ia-muted { --ia: #7a7f8a; }
.ia-easy2 { --ia: #0e8f6e; } .ia-easy { --ia: #2a9d4b; } .ia-mid { --ia: #2f6fdb; } .ia-hard { --ia: #c56a1b; } .ia-hard2 { --ia: #b83232; }
.ia-chip { color: var(--ia); background: color-mix(in srgb, var(--ia) 12%, transparent); border-color: color-mix(in srgb, var(--ia) 30%, transparent); }
.ia-shape { fill: var(--ia); stroke: var(--akb-surface); stroke-width: 1; flex: none; }
.ia-legend { display: inline-flex; align-items: center; gap: .3rem; color: var(--akb-text); }
.ia-chart { width: 100%; height: auto; display: block; overflow: visible; font-family: inherit; }
.ia-grid { stroke: var(--akb-border); stroke-width: 1; }
.ia-baseline { stroke: var(--akb-muted); stroke-width: 1; }
.ia-ref { stroke: var(--akb-muted); stroke-width: 1; stroke-dasharray: 4 4; opacity: .7; }
.ia-axis { fill: var(--akb-muted); font-size: 11px; }
.ia-bar { fill: var(--akb-primary); }
.ia-hover.is-hover .ia-bar { opacity: .8; }
.ia-zone { fill: #0ca30c; opacity: .08; }
.ia-pt { fill: var(--ia); }
.ia-pt :is(circle, rect, polygon):not([fill="transparent"]) { stroke: var(--akb-surface); stroke-width: 2; }
.ia-pt.ia-good { --ia: #0ca30c; } .ia-pt.ia-warning { --ia: #fab219; } .ia-pt.ia-serious { --ia: #ec835a; } .ia-pt.ia-critical { --ia: #d03b3b; }
.ia-legend.ia-warning .ia-shape { fill: #fab219; } .ia-legend.ia-serious .ia-shape { fill: #ec835a; }
.ia-pt.is-hover :is(circle, rect, polygon):not([fill="transparent"]) { stroke: var(--akb-text); }
.ia-pt-label { font-size: 10px; font-weight: 700; fill: var(--akb-text); }
.ia-tip { position: fixed; z-index: 3000; pointer-events: none; background: var(--akb-text); color: var(--akb-surface); font-size: .8rem; padding: .3rem .55rem; border-radius: 6px; max-width: 260px; }
.ia-row { cursor: pointer; }
.ia-row:hover td { background: var(--akb-surface-2); }
.ia-detail > td { background: var(--akb-surface-2); }
.ia-opt td, .ia-opt th { background: transparent; }
@media print { .ia-detail { display: table-row !important; } .ia-guide { display: block; } }
.qp-pics { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: .5rem; max-width: 560px; }
.qp-pic { border: 1px solid var(--akb-border); border-radius: 10px; padding: .35rem; background: var(--akb-surface); }
.qp-pic.is-correct { border: 2px solid #16a34a; }
.qp-pic-img { display: block; width: 100%; height: 90px; object-fit: contain; margin-bottom: .2rem; }
.qp-pic.is-wrong { border: 2px solid #dc2626; }
.dd-preview-zone b { margin-right: .25rem; }

/* บัตรรหัสผ่าน */
.pw-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: .6rem; }
.pw-card { border: 2px dashed #9aa3b5; border-radius: 12px; padding: .6rem .8rem; background: #fff; color: #1f2533; break-inside: avoid; }
.pw-card-head { display: flex; align-items: center; gap: .4rem; font-weight: 700; font-size: .85rem; margin-bottom: .3rem; }
.pw-card-head img { width: 24px; height: 24px; object-fit: contain; }
.pw-card-name { font-weight: 600; margin-bottom: .2rem; }
.pw-card-name small { color: #6b7385; font-weight: 400; }
.pw-card-row { font-size: .95rem; }
.pw-card-row b { font-family: ui-monospace, Menlo, monospace; font-size: 1.1rem; letter-spacing: .05em; }
.pw-card-url { font-size: .72rem; color: #6b7385; margin-top: .2rem; word-break: break-all; }
@media print { .pw-cards { grid-template-columns: repeat(3, 1fr); } .akb-print-area { border: 0 !important; box-shadow: none !important; } }
.akb-pwrule .form-check { margin-bottom: .2rem; }
.stu-bar { position: sticky; bottom: 10px; z-index: 15; display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; padding: .5rem .75rem; margin-top: .75rem; box-shadow: 0 8px 24px rgba(0,0,0,.12); }