/* ============================================================
   TRANG TÍNH NĂNG (Dạy học online · Lớp học trực tuyến)
   Nạp sau styles.css. Dùng lại hero/aurora/app-window/feature/faq của trang chủ;
   thêm hàng chữ–hình xen kẽ, khung điện thoại và hình minh hoạ dựng bằng HTML (mk-*).
   ============================================================ */
.fp-hero h1 { max-width: 19ch; }
.fp-hero .hero-app-frame { max-width: 1040px; margin-inline: auto; }
.fp-stage { position: relative; }

/* thẻ nổi quanh hình minh hoạ */
.fp-float {
  position: absolute; z-index: 3;
  display: flex; align-items: center; gap: 11px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--sh-lg); padding: 11px 15px 11px 11px;
  font-size: 13px; color: var(--ink-body); line-height: 1.35; white-space: nowrap;
  animation: em-bob 5s ease-in-out infinite;
}
.fp-float b { display: block; color: var(--ink); font-size: 14px; }
.fp-float .ff-ico { width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; background: var(--em-50); color: var(--em-700); flex-shrink: 0; }
.fp-float .ff-ico svg { width: 19px; height: 19px; }
.fp-float .ff-ico.warm { background: #fdf1e7; color: #b9683c; }
.fp-float .ff-ico.blue { background: #e8f1ff; color: #1d5fd6; }
.fp-float.tl { left: -28px; top: 18%; }
.fp-float.tr { right: -28px; top: 10%; animation-delay: -1.6s; }
.fp-float.br { right: -24px; bottom: 12%; animation-delay: -3.2s; }
.fp-float.bl { left: -24px; bottom: 10%; animation-delay: -2.4s; }
@media (prefers-reduced-motion: reduce) { .fp-float { animation: none; } }

/* dải năng lực (thay cho số liệu) */
.fp-strip .stat-cell .num { font-size: clamp(24px, 3vw, 34px); }

/* hàng chữ + hình xen kẽ */
.fp-row { display: grid; grid-template-columns: 1fr 1.12fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.fp-row + .fp-row { margin-top: clamp(80px, 10vw, 132px); }
.fp-row.rev .fp-text { order: 2; }
.fp-text h3 { font-size: clamp(24px, 3vw, 34px); margin-top: 16px; }
.fp-text > p { margin-top: 16px; font-size: clamp(15.5px, 1.3vw, 17px); color: var(--ink-muted); }
.fp-checks { margin-top: 22px; display: flex; flex-direction: column; gap: 12px; }
.fp-checks li { display: flex; gap: 11px; align-items: flex-start; font-size: 15px; color: var(--ink-body); }
.fp-checks li svg { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; color: var(--em-600); }
.fp-note { margin-top: 18px; font-size: 13px; color: var(--ink-faint); display: flex; gap: 8px; align-items: flex-start; }
.fp-note svg { width: 15px; height: 15px; flex-shrink: 0; margin-top: 2px; }
.fp-media { position: relative; min-width: 0; }
.fp-media .app-window { border-radius: var(--r-lg); box-shadow: var(--sh-lg); }
.fp-media .app-window img { width: 100%; height: auto; }
.fp-media .app-titlebar { padding: 10px 14px; }

/* khung điện thoại */
.fp-phone {
  width: 268px; max-width: 100%; margin-inline: auto;
  border-radius: 38px; padding: 9px; background: #0c1713;
  box-shadow: var(--sh-xl); position: relative;
}
.fp-phone::before { content: ""; position: absolute; top: 16px; left: 50%; transform: translateX(-50%); width: 74px; height: 20px; border-radius: 12px; background: #0c1713; z-index: 2; }
.fp-phone .screen { border-radius: 30px; overflow: hidden; background: var(--bg-soft); }
.fp-phone .screen > img { width: 100%; height: auto; }
/* ảnh máy tính + điện thoại chồng góc */
.fp-duo { display: grid; grid-template-columns: 1fr auto; align-items: end; }
.fp-duo .fp-phone { width: 210px; margin: 0 0 -36px -64px; }

/* lưới thẻ */
.fp-grid { grid-template-columns: repeat(3, 1fr); }
.feature .btn-link { margin-top: 14px; position: relative; z-index: 1; }
.feature.dark { background: linear-gradient(160deg, var(--em-700), #053b2c); border-color: transparent; }
.feature.dark .f-ico { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.2); color: #fff; }
.feature.dark h3 { color: #fff; }
.feature.dark p { color: rgba(255,255,255,.82); }
.feature.dark .btn-link { color: var(--em-200); }

/* dải phụ (bán khoá học) */
.fp-band {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: center;
  border: 1px solid var(--line-em); border-radius: var(--r-xl);
  padding: clamp(26px, 4vw, 48px); box-shadow: var(--sh-md);
  background: radial-gradient(120% 120% at 100% 0%, var(--em-50), transparent 55%), var(--surface);
}
.fp-band h3 { font-size: clamp(22px, 2.6vw, 30px); margin-top: 14px; }
.fp-band > div > p { margin-top: 14px; color: var(--ink-muted); }
.fp-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.fp-chips span { font-size: 13.5px; font-weight: 500; color: var(--ink-body); background: var(--bg-soft); border: 1px solid var(--line); padding: 9px 14px; border-radius: var(--r-pill); display: inline-flex; align-items: center; gap: 8px; }
.fp-chips svg { width: 16px; height: 16px; color: var(--em-600); }

/* ============================================================
   HÌNH MINH HOẠ DỰNG BẰNG HTML (mk-*)
   ============================================================ */
.mk { padding: clamp(16px, 2.4vw, 26px); background: var(--bg-soft); font-size: 13px; }
.mk-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; }
.mk-card + .mk-card { margin-top: 12px; }
.mk-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.mk-head h5 { font-size: 15px; color: var(--ink); margin: 0; }
.mk-head small { display: block; font-size: 12px; color: var(--ink-muted); font-weight: 400; margin-top: 2px; }
.mk-pill { font-size: 11.5px; font-weight: 600; padding: 4px 10px; border-radius: var(--r-pill); background: var(--em-50); color: var(--em-700); white-space: nowrap; display: inline-flex; align-items: center; gap: 5px; }
.mk-pill svg { width: 13px; height: 13px; }
.mk-pill.warm { background: #fdf1e7; color: #b9683c; }
.mk-pill.red { background: #fdecec; color: #c43d3d; }
.mk-pill.blue { background: #e8f1ff; color: #1d5fd6; }
.mk-pill.grey { background: var(--bg-softer); color: var(--ink-muted); }
.mk-btn { display: inline-flex; align-items: center; gap: 7px; font-weight: 600; font-size: 12.5px; padding: 8px 14px; border-radius: 10px; background: var(--primary); color: #fff; white-space: nowrap; }
.mk-btn svg { width: 15px; height: 15px; }
.mk-btn.ghost { background: var(--surface); color: var(--ink); border: 1px solid var(--line-strong); }
.mk-dot-live { width: 8px; height: 8px; border-radius: 50%; background: #e5484d; box-shadow: 0 0 0 4px rgba(229,72,77,.18); display: inline-block; }

/* màn làm bài */
.mk-timer { font-family: var(--mono); font-size: 15px; font-weight: 700; color: #b9683c; background: #fdf1e7; border: 1px solid #f6d9c2; padding: 7px 13px; border-radius: 11px; display: inline-flex; align-items: center; gap: 7px; }
.mk-timer svg { width: 16px; height: 16px; }
.mk-qnav { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.mk-qnav i { font-style: normal; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 12px; font-weight: 600; background: var(--surface); border: 1px solid var(--line); color: var(--ink-muted); }
.mk-qnav i.done { background: var(--em-50); border-color: var(--line-em); color: var(--em-700); }
.mk-qnav i.cur { background: var(--primary); border-color: var(--primary); color: #fff; }
.mk-q { font-size: 15.5px; color: var(--ink); font-weight: 500; line-height: 1.55; }
.mk-q small { display: block; font-size: 12px; color: var(--ink-muted); font-weight: 500; margin-bottom: 6px; }
.mk-q .blank { display: inline-block; min-width: 84px; border-bottom: 2px dashed var(--em-400); margin: 0 4px; color: var(--em-700); text-align: center; font-weight: 600; }
.mk-opts { margin-top: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.mk-opt { display: flex; align-items: center; gap: 10px; padding: 11px 13px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); font-size: 14px; color: var(--ink-body); }
.mk-opt b { width: 26px; height: 26px; border-radius: 8px; background: var(--bg-soft); display: grid; place-items: center; font-size: 12px; color: var(--ink-muted); flex-shrink: 0; }
.mk-opt.on { border-color: var(--em-500); background: var(--em-50); color: var(--em-800); font-weight: 600; box-shadow: 0 0 0 3px rgba(16,185,129,.12); }
.mk-opt.on b { background: var(--primary); color: #fff; }
.mk-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; gap: 10px; flex-wrap: wrap; }
.mk-foot .muted { font-size: 12px; color: var(--ink-faint); }

/* các dạng câu hỏi */
.mk-types { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.mk-type { display: flex; align-items: center; gap: 10px; padding: 11px 12px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); font-size: 13px; font-weight: 500; color: var(--ink); min-width: 0; }
.mk-type span { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: var(--em-50); color: var(--em-700); flex-shrink: 0; }
.mk-type span svg { width: 16px; height: 16px; }
.mk-type.c2 span { background: #e8f1ff; color: #1d5fd6; }
.mk-type.c3 span { background: #f3ecff; color: #7c4ddb; }
.mk-type.c4 span { background: #fdf1e7; color: #b9683c; }
.mk-type.wide { grid-column: span 3; }
.mk-type.wide em { margin-left: auto; font-style: normal; font-size: 11.5px; color: var(--ink-faint); font-weight: 400; }

/* thống kê */
.mk-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
.mk-kpi { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 12px 14px; }
.mk-kpi small { font-size: 11.5px; color: var(--ink-muted); display: block; }
.mk-kpi b { font-size: 22px; color: var(--ink); letter-spacing: -0.02em; display: block; margin-top: 4px; }
.mk-kpi b em { font-style: normal; font-size: 13px; color: var(--ink-faint); font-weight: 500; }
.mk-kpi.warn b { color: #b9683c; }
.mk-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.mk-table th { text-align: left; font-size: 11px; font-family: var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); font-weight: 600; padding: 0 8px 9px; }
.mk-table td { padding: 9px 8px; border-top: 1px solid var(--line); color: var(--ink-body); white-space: nowrap; }
.mk-table td:first-child { color: var(--ink); font-weight: 600; }
.mk-table .up { color: var(--em-700); font-weight: 600; }
.mk-table .down { color: #c2683f; font-weight: 600; }
.mk-table .up svg, .mk-table .down svg { width: 14px; height: 14px; display: inline-block; vertical-align: -2px; }

/* danh sách buổi học (Lớp hôm nay) */
.mk-sess { display: grid; grid-template-columns: 74px 1fr auto; gap: 14px; align-items: center; padding: 13px 4px; border-top: 1px solid var(--line); }
.mk-sess:first-of-type { border-top: 0; }
.mk-sess .t { font-family: var(--mono); font-weight: 700; color: var(--em-700); font-size: 14px; background: var(--em-50); border-radius: 10px; padding: 7px 0; text-align: center; line-height: 1.2; }
.mk-sess .t small { display: block; font-size: 11px; color: var(--ink-muted); font-weight: 500; }
.mk-sess b { color: var(--ink); font-size: 14px; display: block; }
.mk-sess .meta { font-size: 12px; color: var(--ink-muted); margin-top: 3px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.mk-sess .act { display: flex; gap: 8px; align-items: center; }

/* điểm danh theo phút có mặt */
.mk-att { display: grid; grid-template-columns: 30px 1fr 1.3fr auto; gap: 12px; align-items: center; padding: 10px 0; border-top: 1px solid var(--line); }
.mk-att:first-of-type { border-top: 0; }
.mk-att .av { width: 30px; height: 30px; border-radius: 9px; background: var(--em-100); color: var(--em-800); font-size: 11.5px; font-weight: 700; display: grid; place-items: center; }
.mk-att .nm b { display: block; color: var(--ink); font-size: 13px; }
.mk-att .nm small { font-size: 11.5px; color: var(--ink-muted); }
.mk-bar { height: 8px; border-radius: 6px; background: var(--bg-softer); overflow: hidden; }
.mk-bar i { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--em-400), var(--em-600)); }
.mk-bar i.late { background: linear-gradient(90deg, #f4c58f, #d9894b); }
.mk-bar i.abs { background: linear-gradient(90deg, #f3a7a7, #d9534f); }
.mk-rule { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

/* dòng thời gian + công tắc cài đặt phòng */
.mk-steps { position: relative; padding-left: 26px; }
.mk-steps::before { content: ""; position: absolute; left: 9px; top: 6px; bottom: 6px; width: 2px; background: var(--line-em); }
.mk-step { position: relative; padding: 0 0 14px; }
.mk-step:last-child { padding-bottom: 0; }
.mk-step::before { content: ""; position: absolute; left: -22px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--surface); border: 2.5px solid var(--em-500); }
.mk-step.done::before { background: var(--em-500); }
.mk-step b { color: var(--ink); font-size: 13.5px; display: block; }
.mk-step small { color: var(--ink-muted); font-size: 12px; }
.mk-toggles { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mk-toggle { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 12px; border-radius: 11px; background: var(--bg-soft); border: 1px solid var(--line); font-size: 12.5px; color: var(--ink-body); }
.mk-toggle i { width: 30px; height: 18px; border-radius: 10px; background: var(--em-500); position: relative; flex-shrink: 0; }
.mk-toggle i::after { content: ""; position: absolute; right: 2px; top: 2px; width: 14px; height: 14px; border-radius: 50%; background: #fff; }

/* màn điện thoại dựng bằng HTML */
.mk-mob { padding: 46px 14px 18px; font-size: 13px; min-height: 520px; background: linear-gradient(180deg, var(--em-50), var(--bg-soft) 40%); }
.mk-mob .mb-top { display: flex; align-items: center; gap: 9px; margin-bottom: 14px; font-weight: 700; color: var(--ink); font-size: 14px; }
.mk-mob .mb-top .lg { width: 28px; height: 28px; border-radius: 9px; background: linear-gradient(140deg, var(--em-400), var(--em-600)); display: grid; place-items: center; color: #fff; }
.mk-mob .mb-top .lg svg { width: 15px; height: 15px; }
.mk-mob .mk-card { padding: 14px; border-radius: 18px; }
.mk-mob .big { display: flex; justify-content: center; width: 100%; padding: 13px; font-size: 14.5px; border-radius: 13px; margin-top: 12px; }
.mk-mob .row { display: flex; align-items: center; gap: 9px; font-size: 12.5px; color: var(--ink-muted); margin-top: 6px; }
.mk-mob .row svg { width: 15px; height: 15px; color: var(--em-600); flex-shrink: 0; }
.mk-mob h6 { font-size: 15px; color: var(--ink); margin: 6px 0 2px; }
.mk-video { aspect-ratio: 16/9; border-radius: 13px; background: linear-gradient(140deg, #0f3b2f, #0d6b55 60%, #138a6d); display: grid; place-items: center; position: relative; overflow: hidden; }
.mk-video span { width: 46px; height: 46px; border-radius: 50%; background: rgba(255,255,255,.92); display: grid; place-items: center; color: var(--em-700); }
.mk-video span svg { width: 20px; height: 20px; margin-left: 3px; }
.mk-video small { position: absolute; right: 9px; bottom: 8px; font-family: var(--mono); font-size: 11px; color: #fff; background: rgba(0,0,0,.35); padding: 2px 7px; border-radius: 6px; }
.mk-stars { display: flex; gap: 4px; color: #f2b01e; margin-top: 8px; }
.mk-stars svg { width: 22px; height: 22px; fill: currentColor; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1080px) {
  .fp-float.tl, .fp-float.bl { left: 8px; }
  .fp-float.tr, .fp-float.br { right: 8px; }
}
@media (max-width: 960px) {
  .fp-row { grid-template-columns: 1fr; }
  .fp-row.rev .fp-text { order: 0; }
  .fp-band { grid-template-columns: 1fr; }
  .fp-grid { grid-template-columns: repeat(2, 1fr); }
  .fp-duo .fp-phone { width: 170px; margin-left: -48px; }
}
@media (max-width: 680px) {
  .fp-float { display: none; }
  .fp-grid { grid-template-columns: 1fr; }
  .mk-opts { grid-template-columns: 1fr; }
  .mk-types { grid-template-columns: 1fr 1fr; }
  .mk-type.wide { grid-column: span 2; }
  .mk-kpis { grid-template-columns: 1fr 1fr; }
  .mk-kpis .mk-kpi:last-child { grid-column: span 2; }
  .mk-table th:nth-child(4), .mk-table td:nth-child(4) { display: none; }
  .mk-sess { grid-template-columns: 62px 1fr; }
  .mk-sess .act { grid-column: 1 / -1; }
  .mk-att { grid-template-columns: 30px 1fr auto; }
  .mk-att .mk-bar { display: none; }
  .mk-toggles { grid-template-columns: 1fr; }
  .fp-duo { grid-template-columns: 1fr; }
  .fp-duo .fp-phone { display: none; }
}