/* ============================================================
   Kairalmas LMS — mobile-first UI
   ============================================================ */
:root {
  --primary: #4f46e5;
  --primary-600: #4338ca;
  --primary-soft: #eef2ff;
  --grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --warn: #d97706;
  --warn-soft: #fef3c7;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .07), 0 6px 20px -8px rgba(15, 23, 42, .1);
  --shadow-lg: 0 10px 40px -12px rgba(79, 70, 229, .35);
  --topbar-h: 60px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.55;
  padding-bottom: env(safe-area-inset-bottom);
  min-height: 100dvh;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }
h1 { font-size: 1.55rem; line-height: 1.25; }
h2 { font-size: 1.25rem; margin-bottom: .65rem; }
h3 { font-size: 1.05rem; }
.container { width: min(1180px, 100% - 2rem); margin-inline: auto; }
.narrow { max-width: 760px; }
.muted { color: var(--muted); }
.muted-light { color: #cbd5e1; }
.center { text-align: center; }
.self-start { align-self: flex-start; }
.skip-link { position: absolute; left: -9999px; top: 0; background: #fff; z-index: 999; padding: .5rem 1rem; }
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .58rem 1.15rem; border-radius: var(--radius-sm);
  border: 1.5px solid transparent; font-weight: 600; font-size: .92rem;
  transition: transform .08s ease, box-shadow .15s ease, background .15s ease;
  text-decoration: none !important; white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px -4px rgba(79, 70, 229, .5); }
.btn-primary:hover { background: var(--primary-600); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost-light { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.35); }
.btn-ghost-light:hover { background: rgba(255,255,255,.2); }
.btn-success { background: var(--success); color: #fff; }
.btn-success-outline { background: var(--success-soft); color: var(--success); border-color: var(--success); }
.btn-primary-outline { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-lg { padding: .8rem 1.6rem; font-size: 1rem; border-radius: 12px; }
.btn-sm { padding: .34rem .75rem; font-size: .84rem; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: not-allowed; }

/* ---------- Inputs ---------- */
.input {
  width: 100%; padding: .6rem .85rem; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); background: #fff; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); }
textarea.input { resize: vertical; }
.input-label { display: flex; flex-direction: column; gap: .3rem; font-weight: 600; font-size: .88rem; }
.input-sm { padding: .35rem .55rem; font-size: .85rem; }
.input-inline { width: auto; flex: 1; }
.check-label { display: flex; gap: .5rem; align-items: center; font-weight: 500; font-size: .92rem; }
.check-label input { width: 18px; height: 18px; accent-color: var(--primary); }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: .9rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: .9rem; }
.stack { display: flex; flex-direction: column; gap: .95rem; }
.inline-form { display: flex; gap: .55rem; align-items: center; flex-wrap: wrap; }
.inline-form.grow { flex: 1; }
.form-actions { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }

/* ---------- Chips / flashes ---------- */
.chip {
  display: inline-flex; align-items: center; gap: .25rem;
  background: var(--primary-soft); color: var(--primary-600);
  border-radius: 999px; padding: .18rem .7rem; font-size: .78rem; font-weight: 600;
}
.chip-sm { padding: .05rem .5rem; font-size: .7rem; }
.chip-ok, .status-approved { background: var(--success-soft); color: var(--success); }
.chip-bad, .status-rejected { background: var(--danger-soft); color: var(--danger); }
.status-pending { background: var(--warn-soft); color: var(--warn); }
.chip-warn { background: var(--warn-soft); color: var(--warn); }
.chip-click { cursor: pointer; border: none; }
.chip-click:hover { filter: brightness(.95); }
.chip-active { outline: 2px solid var(--primary); }
.flashes { margin-top: .8rem; }
.flash { padding: .7rem 1rem; border-radius: var(--radius-sm); margin-bottom: .5rem; font-size: .92rem; border: 1px solid; }
.flash-success { background: var(--success-soft); color: #14532d; border-color: #a7f3d0; }
.flash-error { background: var(--danger-soft); color: #7f1d1d; border-color: #fecaca; }
.flash-warn, .flash-info { background: var(--warn-soft); color: #78350f; border-color: #fde68a; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60; background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.topbar-in { display: flex; align-items: center; gap: 1rem; height: var(--topbar-h); }
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 800; font-size: 1.05rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad); color: #fff; font-size: 1.05rem; box-shadow: var(--shadow-lg);
}
.nav-main { display: none; gap: .35rem; margin-left: .5rem; }
.nav-main a { padding: .4rem .7rem; border-radius: 8px; color: var(--text); font-weight: 500; font-size: .93rem; }
.nav-main a:hover { background: var(--primary-soft); color: var(--primary); text-decoration: none; }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: .45rem; }
.nav-toggle { background: none; border: none; font-size: 1.45rem; line-height: 1; padding: .3rem .5rem; }
@media (max-width: 639px) {
  .topbar-actions .topbar-btn { display: none; }
}
.avatar-btn { background: none; border: none; padding: 0; }
.avatar {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%;
  background: var(--grad); color: #fff; font-weight: 700; font-size: .85rem;
}
.avatar-lg { width: 62px; height: 62px; font-size: 1.35rem; }
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; right: 0; top: calc(100% + 8px); background: #fff; min-width: 210px;
  border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-lg);
  padding: .4rem; display: none; z-index: 80;
}
.dropdown.open .dropdown-menu { display: block; }
.dropdown-menu a { display: block; padding: .5rem .7rem; border-radius: 8px; color: var(--text); font-size: .92rem; }
.dropdown-menu a:hover { background: var(--primary-soft); text-decoration: none; }
.dropdown-menu .danger { color: var(--danger); }
.dropdown-menu .admin-link { color: var(--primary); font-weight: 700; }
.dropdown-head { padding: .5rem .7rem; border-bottom: 1px solid var(--border); margin-bottom: .3rem; display: flex; flex-direction: column; }
.dropdown-head small { color: var(--muted); }

/* mobile nav drawer */
.nav-main.mobile-open {
  display: flex; flex-direction: column; position: absolute; top: var(--topbar-h); left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border); padding: .6rem 1.2rem; box-shadow: var(--shadow);
}

/* ---------- Bottom nav (mobile) ---------- */
.bottom-nav {
  display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 70;
  background: rgba(255,255,255,.96); backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  padding: .35rem .3rem calc(.35rem + env(safe-area-inset-bottom));
}
.bn-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 1px;
  font-size: .68rem; color: var(--muted); padding: .25rem 0; border-radius: 8px;
}
.bn-item:hover { text-decoration: none; color: var(--primary); }
.page-body { padding-bottom: 5rem; min-height: 60vh; }
@media (min-width: 900px) { .bottom-nav { display: none; } .page-body { padding-bottom: 0; } }

/* ---------- Hero ---------- */
.hero { background: radial-gradient(1200px 500px at 85% -10%, rgba(139,92,246,.25), transparent 60%), radial-gradient(900px 400px at -10% 110%, rgba(99,102,241,.18), transparent 55%), var(--bg); padding: 3rem 0 3.5rem; }
.hero-in { display: grid; gap: 2.2rem; }
.hero-badge { display: inline-block; background: #fff; border: 1px solid var(--border); padding: .3rem .9rem; border-radius: 999px; font-size: .82rem; font-weight: 600; color: var(--primary); margin-bottom: 1rem; box-shadow: var(--shadow); }
.hero-copy h1 { font-size: clamp(1.8rem, 5vw, 2.9rem); font-weight: 800; letter-spacing: -.02em; margin-bottom: .8rem; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy p { font-size: 1.02rem; color: var(--muted); max-width: 34rem; margin-bottom: 1.4rem; }
.hero-cta { display: flex; gap: .7rem; flex-wrap: wrap; margin-bottom: 1.8rem; }
.hero-stats { display: flex; gap: 1.6rem; flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.3rem; font-weight: 800; }
.hero-stats span { font-size: .8rem; color: var(--muted); }
.hero-art { display: none; }

/* ---------- Sections & cards ---------- */
.section { padding: 1.6rem 0; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: .8rem; flex-wrap: wrap; margin-bottom: 1rem; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.15rem; box-shadow: var(--shadow); }
.empty-state { text-align: center; padding: 3rem 1rem; font-size: 3rem; }
.empty-state h3, .empty-state h1 { font-size: 1.3rem; margin: .4rem 0; }
.empty-state p { color: var(--muted); margin-bottom: 1rem; }

/* categories */
.cat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .7rem; }
.cat-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem .8rem; display: flex; flex-direction: column; gap: .15rem; box-shadow: var(--shadow); }
.cat-card:hover { border-color: var(--primary); text-decoration: none; transform: translateY(-2px); transition: .15s; }
.cat-icon { font-size: 1.5rem; }
.cat-name { font-weight: 700; font-size: .92rem; }
.cat-count { font-size: .76rem; color: var(--muted); }

/* course cards */
.course-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.course-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s; }
.course-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.cc-thumb { position: relative; display: block; aspect-ratio: 16/9; background: #eef2ff; }
.cc-thumb img { width: 100%; height: 100%; object-fit: cover; }
.cc-placeholder { display: grid; place-items: center; width: 100%; height: 100%; font-size: 1.7rem; font-weight: 800; color: #fff; background: var(--grad); opacity: .9; }
.cc-thumb.sm { width: 96px; height: 60px; border-radius: 8px; overflow: hidden; flex-shrink: 0; }
.cc-thumb.sm .cc-placeholder { font-size: 1rem; }
.cc-badge { position: absolute; top: 10px; left: 10px; background: rgba(15,23,42,.8); color: #fff; font-size: .7rem; font-weight: 800; padding: .18rem .55rem; border-radius: 999px; letter-spacing: .05em; }
.cc-badge.free { background: var(--success); }
.cc-badge.sale { background: var(--danger); }
.cc-body { padding: .9rem 1rem 1rem; display: flex; flex-direction: column; gap: .4rem; flex: 1; }
.cc-cat { font-size: .74rem; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .04em; }
.cc-title { font-size: 1rem; line-height: 1.35; }
.cc-title a { color: var(--text); }
.cc-desc { font-size: .85rem; color: var(--muted); }
.cc-meta { display: flex; gap: .8rem; font-size: .78rem; color: var(--muted); flex-wrap: wrap; }
.stars { color: #f59e0b; font-weight: 700; }
.cc-foot { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: .4rem; }
.cc-price { font-size: 1.12rem; font-weight: 800; }
.cc-price.free { color: var(--success); }
.cc-old { color: var(--muted); font-size: .85rem; margin-left: .35rem; }

/* filter bar */
.filter-bar { display: grid; grid-template-columns: 1fr; gap: .6rem; margin-bottom: 1.3rem; }

/* pager */
.pager { display: flex; gap: .4rem; justify-content: center; margin-top: 1.4rem; flex-wrap: wrap; }
.pager-link { min-width: 38px; text-align: center; padding: .4rem .6rem; border: 1.5px solid var(--border); border-radius: 8px; font-weight: 600; background: #fff; }
.pager-link.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* why */
.why-grid { display: grid; grid-template-columns: 1fr; gap: .9rem; }
.why-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem; box-shadow: var(--shadow); }
.why-icon { font-size: 1.7rem; }
.why-card h3 { margin: .45rem 0 .3rem; }

/* ---------- Course detail ---------- */
.course-hero { background: linear-gradient(135deg, #1e1b4b 0%, #312e81 55%, #4338ca 100%); color: #fff; padding: 1.8rem 0 2.2rem; }
.course-hero h1 { font-size: clamp(1.35rem, 4vw, 2.1rem); margin: .4rem 0 .6rem; }
.course-hero-desc { color: #e0e7ff; max-width: 40rem; margin-bottom: .8rem; }
.course-hero-meta { display: flex; gap: .6rem .55rem; flex-wrap: wrap; font-size: .85rem; margin-bottom: .6rem; align-items: center; }
.course-hero-meta .chip { background: rgba(255,255,255,.14); color: #e0e7ff; }
.course-hero-in { display: grid; gap: 1.4rem; }
.crumbs { font-size: .8rem; color: #c7d2fe; }
.crumbs a { color: #c7d2fe; }
.course-buy-card { background: #fff; color: var(--text); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow-lg); height: fit-content; }
.cbc-thumb { border-radius: 10px; overflow: hidden; margin-bottom: .8rem; aspect-ratio: 16/9; background: var(--primary-soft); }
.cbc-price { display: flex; align-items: baseline; gap: .5rem; margin-bottom: .7rem; flex-wrap: wrap; }
.price-big { font-size: 1.7rem; font-weight: 800; }
.price-big.free { color: var(--success); }
.off-tag { color: var(--danger); font-style: normal; font-weight: 700; font-size: .85rem; }
.cbc-list { list-style: none; margin-top: .9rem; display: flex; flex-direction: column; gap: .45rem; font-size: .9rem; }
.progress-wrap { margin: .6rem 0; }
.progress { height: 8px; background: #e2e8f0; border-radius: 999px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--grad); border-radius: 999px; transition: width .4s; }
.course-body-grid { display: grid; gap: 1.2rem; }
.course-body-main { display: flex; flex-direction: column; gap: 1.2rem; }
.course-body-side { display: flex; flex-direction: column; gap: 1.2rem; }
.mini-course { display: flex; flex-direction: column; gap: .15rem; padding: .6rem 0; border-bottom: 1px dashed var(--border); }
.mini-course:last-child { border-bottom: none; }
.rich p { margin-bottom: .8rem; }
.rich h1,.rich h2,.rich h3 { margin: 1.1rem 0 .5rem; }
.rich ul,.rich ol { margin: .5rem 0 .9rem 1.3rem; }
.rich img { border-radius: 10px; margin: .6rem 0; }
.rich a { text-decoration: underline; }
.curr-section { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: .6rem; background: #fff; }
.curr-section summary { padding: .75rem .9rem; cursor: pointer; display: flex; justify-content: space-between; gap: .6rem; align-items: center; font-size: .95rem; }
.curr-lessons { list-style: none; padding: .2rem .5rem .6rem; }
.curr-lessons li { display: flex; gap: .6rem; align-items: center; padding: .5rem .5rem; font-size: .9rem; border-top: 1px dashed var(--border); flex-wrap: wrap; }
.cl-icon { width: 1.4em; }
.review { border-top: 1px dashed var(--border); padding: .8rem 0; }
.review-head { display: flex; gap: .6rem; align-items: center; margin-bottom: .4rem; }
.review-head div { flex: 1; display: flex; flex-direction: column; }

/* ---------- Enrollments ---------- */
.enr-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.enr-card { display: flex; flex-direction: column; gap: .8rem; }
.enr-thumb { aspect-ratio: 16/7; border-radius: 10px; overflow: hidden; background: var(--primary-soft); }
.enr-actions { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---------- Learn player ---------- */
.learn-body { background: #fff; }
.learn-topbar { background: #fff; }
.learn-wrap { min-height: calc(100dvh - var(--topbar-h)); }
.learn-layout { display: grid; grid-template-columns: 1fr; }
.learn-curriculum {
  position: fixed; inset: var(--topbar-h) 0 0 0; width: min(340px, 88vw); left: 0;
  background: #fff; z-index: 90; transform: translateX(-105%); transition: transform .25s ease;
  overflow-y: auto; border-right: 1px solid var(--border); padding: 1rem;
}
.learn-curriculum.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
.lc-head { border-bottom: 1px solid var(--border); padding-bottom: .8rem; margin-bottom: .8rem; }
.lc-section { font-weight: 800; font-size: .8rem; text-transform: uppercase; color: var(--muted); margin: 1rem .2rem .4rem; letter-spacing: .03em; }
.lc-item { display: flex; align-items: center; gap: .55rem; padding: .5rem .55rem; border-radius: 8px; color: var(--text); font-size: .9rem; }
.lc-item:hover { background: var(--primary-soft); text-decoration: none; }
.lc-item.active { background: var(--primary); color: #fff; }
.lc-check { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: #e2e8f0; font-size: .7rem; flex-shrink: 0; }
.lc-check.on { background: var(--success); color: #fff; }
.lc-item.active .lc-check { background: rgba(255,255,255,.25); }
.lc-title { flex: 1; }
.lc-dur { font-size: .75rem; color: var(--muted); }
.lc-item.active .lc-dur { color: #e0e7ff; }
.learn-main { padding: 1rem; }
.learn-content h1 { margin: .5rem 0 1rem; }
.lesson-head { display: flex; gap: .5rem; flex-wrap: wrap; }
.lesson-rich { margin-top: 1rem; font-size: 1rem; }
.lesson-actions { display: flex; justify-content: space-between; gap: .7rem; margin-top: 1.6rem; flex-wrap: wrap; }
.video-embed { position: relative; aspect-ratio: 16/9; border-radius: var(--radius-sm); overflow: hidden; background: #000; margin-top: 1rem; }
.video-embed iframe, .video-embed video { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.hint-ai { margin: 1rem 0; }

/* ---------- Quiz ---------- */
.quiz-wrap { max-width: 860px; }
.quiz-card { padding: 1.3rem; }
.quiz-meta { display: flex; gap: .5rem; flex-wrap: wrap; margin: .8rem 0 .4rem; }
.quiz-questions { list-style: decimal; padding-left: 1.3rem; display: flex; flex-direction: column; gap: 1.2rem; margin: 1rem 0; }
.quiz-q-text { font-weight: 600; margin-bottom: .6rem; display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.quiz-opts { display: flex; flex-direction: column; gap: .5rem; }
.quiz-opt { display: flex; align-items: center; gap: .6rem; padding: .65rem .8rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; background: #fff; font-size: .95rem; }
.quiz-opt:hover { border-color: var(--primary); }
.quiz-opt input { accent-color: var(--primary); width: 18px; height: 18px; }
.quiz-opt.picked { border-color: var(--primary); background: var(--primary-soft); }
.quiz-opts.review .quiz-opt { cursor: default; }
.quiz-opts.review .quiz-opt.correct { border-color: var(--success); background: var(--success-soft); }
.quiz-opts.review .quiz-opt.wrong { border-color: var(--danger); background: var(--danger-soft); }
.quiz-foot { display: flex; gap: .6rem; flex-wrap: wrap; padding-top: 1rem; border-top: 1px solid var(--border); }
.quiz-cta { background: var(--primary-soft); border-radius: var(--radius-sm); padding: 1rem; margin: 1rem 0; display: flex; flex-direction: column; gap: .6rem; align-items: flex-start; }
.result-hero { text-align: center; padding: 1.4rem 0 1.2rem; border-bottom: 1px solid var(--border); margin-bottom: 1.2rem; }
.result-hero.pass h1 { color: var(--success); }
.result-hero.fail h1 { color: var(--warn); }
.result-emoji { font-size: 2.6rem; }
.result-score { font-size: 2.6rem; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Orders / checkout ---------- */
.checkout-course { display: flex; gap: .9rem; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--border); margin-bottom: 1rem; flex-wrap: wrap; }
.checkout-course div:nth-child(2) { flex: 1; min-width: 180px; }
.order-card { margin-bottom: .9rem; }
.order-head { display: flex; justify-content: space-between; gap: .8rem; align-items: flex-start; flex-wrap: wrap; }
.order-pay { border-top: 1px dashed var(--border); margin-top: .8rem; padding-top: .8rem; }
.pay-instructions { background: var(--warn-soft); border: 1px solid #fde68a; border-radius: var(--radius-sm); padding: .9rem; font-size: .92rem; margin-bottom: .7rem; }

/* ---------- AI chat ---------- */
.ai-page-head { display: flex; flex-direction: column; gap: .3rem; margin-bottom: 1rem; align-items: flex-start; }
.ai-chat-card { display: flex; flex-direction: column; height: min(70vh, 640px); padding: 0; overflow: hidden; }
.ai-msgs { flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: .7rem; }
.ai-msg { max-width: 85%; padding: .65rem .9rem; border-radius: 14px; font-size: .95rem; white-space: pre-wrap; word-wrap: break-word; }
.ai-msg.ai-user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.ai-msg.ai-assistant { align-self: flex-start; background: var(--primary-soft); color: var(--text); border-bottom-left-radius: 4px; }
.ai-msg.ai-error { background: var(--danger-soft); color: #7f1d1d; }
.ai-typing { align-self: flex-start; color: var(--muted); font-size: .85rem; padding: .4rem .9rem; }
.ai-form { display: flex; gap: .6rem; padding: .8rem; border-top: 1px solid var(--border); }
.ai-form textarea { flex: 1; resize: none; }
.ai-suggest { display: flex; gap: .5rem; padding: 0 .8rem .8rem; flex-wrap: wrap; }

/* floating AI widget */
.ai-fab-wrap { position: fixed; right: 1rem; bottom: calc(4.6rem + env(safe-area-inset-bottom)); z-index: 95; display: flex; flex-direction: column; align-items: flex-end; }
.ai-fab {
  display: inline-flex; align-items: center; gap: .45rem; border: none; border-radius: 999px;
  background: var(--grad); color: #fff; font-weight: 700; padding: .65rem 1.1rem;
  box-shadow: var(--shadow-lg); font-size: .92rem;
}
.ai-panel {
  position: fixed; right: .8rem; bottom: calc(4.6rem + 3.6rem + env(safe-area-inset-bottom)); left: .8rem;
  max-width: 400px; margin-left: auto; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg); display: flex; flex-direction: column;
  height: min(62vh, 520px); overflow: hidden;
}
.ai-panel-head { display: flex; justify-content: space-between; align-items: center; padding: .7rem .9rem; border-bottom: 1px solid var(--border); }
.ai-panel-head button { background: none; border: none; font-size: 1rem; }
.ai-panel-msgs { flex: 1; overflow-y: auto; padding: .8rem; display: flex; flex-direction: column; gap: .55rem; }
.ai-panel-form { display: flex; gap: .5rem; padding: .6rem; border-top: 1px solid var(--border); }
.ai-panel-form input { flex: 1; }

/* ---------- Profile / auth ---------- */
.auth-page { background: radial-gradient(900px 400px at 90% -10%, rgba(139,92,246,.25), transparent 55%), var(--bg); min-height: 100dvh; display: grid; place-items: center; padding: 1.4rem; }
.auth-wrap { width: min(430px, 100%); }
.auth-card { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow-lg); padding: 1.7rem; display: flex; flex-direction: column; gap: .9rem; }
.auth-brand { justify-content: center; }
.auth-title { font-size: 1.35rem; }
.auth-sub { color: var(--muted); margin-bottom: .4rem; }
.auth-links { display: flex; gap: .5rem; justify-content: center; font-size: .9rem; margin-top: .4rem; }
.auth-foot { text-align: center; color: var(--muted); font-size: .8rem; margin-top: .9rem; }
.profile-head { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin-bottom: 1rem; }
.profile-head h1 { font-size: 1.3rem; }
.profile-badges { margin-left: auto; display: flex; gap: .5rem; flex-wrap: wrap; }
.profile-card { display: flex; flex-direction: column; gap: 1.6rem; }

/* ---------- Certificate ---------- */
.cert-body { background: #eef0f6; padding: 1.2rem; }
.cert-shell { max-width: 900px; margin: 0 auto; }
.cert {
  background: #fff; border: 3px solid #312e81; outline: 1px solid #c7d2fe; outline-offset: -10px;
  border-radius: 8px; padding: clamp(1rem, 4vw, 2.5rem);
}
.cert-inner { text-align: center; display: flex; flex-direction: column; gap: .5rem; align-items: center; border: 1px dashed #c7d2fe; border-radius: 6px; padding: clamp(1rem, 4vw, 2.2rem); }
.cert-brand { display: inline-flex; gap: .5rem; align-items: center; font-weight: 800; font-size: 1.1rem; color: #312e81; }
.cert-kicker { text-transform: uppercase; letter-spacing: .35em; font-size: .78rem; color: var(--muted); margin-top: .6rem; }
.cert-name { font-size: clamp(1.6rem, 5vw, 2.6rem); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cert-course { font-size: clamp(1.1rem, 3.5vw, 1.6rem); color: #1e293b; }
.cert-award { color: var(--muted); }
.cert-row { display: flex; justify-content: space-between; width: 100%; margin-top: 1.6rem; gap: 1rem; flex-wrap: wrap; }
.cert-sig { display: flex; flex-direction: column; align-items: center; gap: .2rem; }
.cert-line { width: 180px; border-top: 2px solid var(--text); }
.cert-meta { display: flex; flex-direction: column; gap: .2rem; align-items: flex-end; text-align: right; }
.cert-actions { display: flex; gap: .6rem; justify-content: center; margin-top: 1.2rem; }
@media print {
  body.cert-body { background: #fff; padding: 0; }
  .no-print { display: none !important; }
  .cert { border-width: 4px; }
}

/* ---------- Footer ---------- */
.footer { background: #0f172a; color: #cbd5e1; margin-top: 2.5rem; }
.footer .brand-name { color: #fff; }
.footer-in { display: flex; flex-direction: column; gap: 1.2rem; padding: 2rem 0 1rem; }
.footer-links { display: flex; flex-direction: column; gap: .5rem; }
.footer-links a { color: #cbd5e1; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; padding: 1rem 0; font-size: .82rem; color: #64748b; }

/* ---------- Admin ---------- */
.admin-body { display: grid; grid-template-columns: 1fr; min-height: 100dvh; background: var(--bg); }
.admin-side {
  position: fixed; inset: 0 auto 0 0; width: 250px; background: #111827; z-index: 100;
  transform: translateX(-105%); transition: transform .25s ease; display: flex; flex-direction: column;
}
.admin-side.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
.admin-side-head { display: flex; align-items: center; justify-content: space-between; padding: 1rem; border-bottom: 1px solid #1f2937; }
.admin-side-head .brand-name { color: #fff; }
.admin-side-close { color: #fff; }
.admin-nav { display: flex; flex-direction: column; padding: .8rem .6rem; gap: .15rem; }
.admin-nav a { color: #d1d5db; padding: .6rem .8rem; border-radius: 8px; font-size: .94rem; }
.admin-nav a:hover { background: #1f2937; text-decoration: none; color: #fff; }
.admin-nav a.active { background: var(--primary); color: #fff; font-weight: 700; }
.admin-nav-sep { border-top: 1px solid #1f2937; margin: .6rem 0; }
.admin-main { display: flex; flex-direction: column; min-height: 100dvh; }
.admin-top {
  display: flex; align-items: center; gap: .8rem; padding: .7rem 1rem;
  background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50;
}
.admin-title { font-size: 1.05rem; margin: 0; flex: 1; }
.admin-top-user { display: flex; align-items: center; gap: .5rem; font-size: .9rem; }
.admin-content { padding: 1.1rem; display: flex; flex-direction: column; gap: 1rem; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .8rem; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; display: flex; gap: .8rem; align-items: center; box-shadow: var(--shadow); }
.stat-card div { display: flex; flex-direction: column; }
.stat-card strong { font-size: 1.35rem; font-weight: 800; }
.stat-card span:not(.stat-ico) { font-size: .78rem; color: var(--muted); }
.stat-ico { font-size: 1.6rem; }
.stat-card.warn { border-left: 4px solid var(--warn); }
.admin-grid-2 { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.table-card { padding: .5rem; }
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 640px; }
.table th { text-align: left; padding: .6rem .7rem; color: var(--muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .04em; border-bottom: 1px solid var(--border); }
.table td { padding: .65rem .7rem; border-bottom: 1px solid #f1f5f9; vertical-align: top; }
.table tr:last-child td { border-bottom: none; }
.row-actions { display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; }
.row-actions form { display: inline; }
.bar-row { display: grid; grid-template-columns: minmax(90px, 160px) 1fr 34px; gap: .6rem; align-items: center; margin-bottom: .55rem; font-size: .84rem; }
.bar { height: 10px; background: #e2e8f0; border-radius: 999px; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--grad); border-radius: 999px; }
.bar-val { text-align: right; font-weight: 700; }
.mini-list { list-style: none; display: flex; flex-direction: column; gap: .6rem; }
.mini-list li { display: flex; align-items: center; gap: .6rem; }
.mini-list li div { flex: 1; display: flex; flex-direction: column; }
.chip-filter { display: flex; gap: .5rem; flex-wrap: wrap; }
.curr-admin-card { margin-bottom: 1rem; }
.curr-admin-head { display: flex; gap: .6rem; justify-content: space-between; align-items: center; flex-wrap: wrap; margin-bottom: .7rem; border-bottom: 1px dashed var(--border); padding-bottom: .6rem; }
.lesson-edit { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: .7rem; background: #fafbff; }
.lesson-edit summary { padding: .7rem .9rem; cursor: pointer; display: flex; justify-content: space-between; gap: .6rem; align-items: center; flex-wrap: wrap; font-size: .94rem; }
.lesson-edit.add-lesson { border-style: dashed; }
.lesson-form { padding: .3rem .9rem .9rem; }
.lesson-edit > form.confirm-form { padding: 0 .9rem .8rem; display: inline-block; }
.lesson-edit > a.btn { margin: 0 .9rem .8rem; }
.quiz-opt-edit { display: flex; flex-direction: column; gap: .5rem; }
.quiz-opt-row { display: flex; gap: .55rem; align-items: center; }
.quiz-opt-row input[type="radio"] { width: 18px; height: 18px; accent-color: var(--success); flex-shrink: 0; }
.quiz-opt-row .chip { flex-shrink: 0; }
.order-details { display: grid; grid-template-columns: 1fr; gap: .9rem; }
.order-details > div { display: flex; flex-direction: column; }
.ai-test-out { border-radius: var(--radius-sm); padding: .8rem 1rem; font-size: .9rem; background: var(--primary-soft); white-space: pre-wrap; }
.ai-test-out.err { background: var(--danger-soft); color: #7f1d1d; }
.thumb-preview { width: 180px; border-radius: 8px; margin-bottom: .5rem; }

/* rich editor */
.rich-editor {
  min-height: 130px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  padding: .6rem .85rem; background: #fff; outline: none; overflow-y: auto;
}
.rich-editor:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.15); }
.editor-toolbar { display: flex; gap: .35rem; flex-wrap: wrap; margin-bottom: .4rem; }
.editor-toolbar button {
  border: 1px solid var(--border); background: #fff; border-radius: 7px; padding: .28rem .6rem;
  font-size: .85rem; font-weight: 700;
}
.editor-toolbar button:hover { border-color: var(--primary); color: var(--primary); }
.editor-area { display: none; }

/* ---------- Desktop ---------- */
@media (min-width: 640px) {
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: repeat(4, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .enr-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
  .stat-grid.sm { grid-template-columns: repeat(4, 1fr); }
  .order-details { grid-template-columns: repeat(2, 1fr); }
  .filter-bar { grid-template-columns: 2fr 1.4fr 1fr auto; }
  .ai-panel { right: 1.2rem; left: auto; }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .nav-main { display: flex; }
  .hero-in { grid-template-columns: 1.2fr .8fr; align-items: center; }
  .hero-art { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; position: relative; }
  .hero-card {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: .95rem 1rem;
    display: flex; gap: .7rem; align-items: center; box-shadow: var(--shadow);
  }
  .hero-card div { display: flex; flex-direction: column; }
  .hero-card small { color: var(--muted); }
  .hero-card.hc-1 { transform: rotate(-2deg); }
  .hero-card.hc-2 { transform: rotate(1.5deg); margin-top: 1.4rem; }
  .hero-card.hc-3 { transform: rotate(-1deg); }
  .footer-in { flex-direction: row; justify-content: space-between; }
  .footer-links { flex-direction: row; gap: 1.4rem; }
  .course-body-grid { grid-template-columns: 1.7fr 1fr; }
  .course-hero-in { grid-template-columns: 1.6fr 1fr; align-items: start; }
  .admin-grid-2 { grid-template-columns: 1.5fr 1fr; }
  .course-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .admin-body { grid-template-columns: 250px 1fr; }
  .admin-side { position: sticky; top: 0; height: 100dvh; transform: none; }
  .admin-side-close { display: none; }
  #adminSideOpen { display: none; }
  .hide-sm { display: inline; }
  .learn-layout { grid-template-columns: 340px 1fr; }
  .learn-curriculum { position: sticky; top: var(--topbar-h); height: calc(100dvh - var(--topbar-h)); transform: none; border-right: 1px solid var(--border); box-shadow: none; }
  #curriculumToggle { display: none; }
  .learn-main { padding: 1.6rem 2rem; max-width: 980px; }
}