/* canh.css — khối "Nhìn là hiểu" (canh.js) trên trang Tóm tắt SGK: hình tương tác kéo / xoay / từng bước + Đoán trước.
   Theo ngôn ngữ thiết kế CEAO: nền --card, viền inset --sep, bo 20px, nút viên thuốc 999px (vùng bấm ≥ 44px), tông san hô của logo.
   Mỗi biến màu có giá trị dự phòng; chế độ tối theo hệ thống. */
.cn {
  --cn-1: #4f6bff; --cn-2: #8b5cf6; --cn-3: #15803d; --cn-4: #ef7d4f; --cn-5: #0e9fb8; --cn-mo: rgba(120, 120, 128, 0.55);
  --cn-ok: var(--green, #15803d); --cn-bad: var(--red, #c0262d); --cn-acc: var(--accent, #f59a78); --cn-link: var(--link, #d8643d);
  position: relative; margin: 16px 0; padding: 14px 16px 16px; border-radius: 22px; background: var(--card, #fff); box-shadow: inset 0 0 0 1px var(--sep, rgba(0, 0, 0, 0.1));
  font-size: 16.5px; line-height: 1.5; color: var(--label, #1d1d1f); scroll-margin-top: 124px; overflow-wrap: anywhere;
}
/* Tối: theo máy, trừ khi app ép sáng (data-theme="light" trên <html>); app ép tối bằng data-theme="dark" */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .cn { --cn-1: #7d93ff; --cn-2: #b18cff; --cn-3: #34c38f; --cn-4: #ff9a6b; --cn-5: #4fd1e6; --cn-mo: rgba(200, 200, 210, 0.5); }
}
:root[data-theme="dark"] .cn { --cn-1: #7d93ff; --cn-2: #b18cff; --cn-3: #34c38f; --cn-4: #ff9a6b; --cn-5: #4fd1e6; --cn-mo: rgba(200, 200, 210, 0.5); }
.cn-nojs { margin: 0; }
.cn-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 2px 10px; margin: 0 0 8px; }
.cn-tag { display: inline-flex; align-items: center; gap: 5px; color: var(--cn-link); font-size: 14.5px; font-weight: 700; white-space: nowrap; }
/* Biểu tượng nét trong nhãn (c.ic) — không dùng emoji */
.cn-ic { flex: none; width: 18px; height: 18px; vertical-align: -3px; }
.cn-tag .cn-ic { width: 17px; height: 17px; }
.cn-pill .cn-ic { width: 17px; height: 17px; margin: 0 -1px; }
.cn-tabs button { display: inline-flex; align-items: center; gap: 6px; }
.cn-tabs button .cn-ic { width: 17px; height: 17px; }
.cn-title { font-size: 17.5px; font-weight: 700; letter-spacing: -0.01em; }
.cn-huong { margin: 0 0 10px; }
.cn-huong > *:last-child { margin-bottom: 0; }

/* Tab Khám phá / Đoán trước: hai viên thuốc trong rãnh --fill */
.cn-tabs { display: flex; gap: 4px; width: max-content; max-width: 100%; margin: 0 0 12px; padding: 4px; border-radius: 999px; background: var(--fill, rgba(120, 120, 128, 0.12)); }
.cn-tabs button {
  min-height: 36px; padding: 0 16px; border: 0; border-radius: 999px; background: transparent; color: var(--label-2, #6e6e73);
  font: inherit; font-size: 15px; font-weight: 600; cursor: pointer; white-space: nowrap; transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.cn-tabs button.on { background: var(--card, #fff); color: var(--label, #1d1d1f); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08), 0 4px 12px -6px rgba(0, 0, 0, 0.25); }

/* Sân khấu hình vẽ */
.cn-stage { position: relative; margin: 0 0 12px; border-radius: 18px; background: var(--fill-2, var(--fill, rgba(120, 120, 128, 0.08))); overflow: hidden; }
.cn-stage > svg { display: block; width: 100%; height: auto; max-height: 62vh; margin: 0 auto; user-select: none; -webkit-user-select: none; touch-action: pan-y; }
.cn-stage.xoay > svg { touch-action: none; cursor: grab; }
.cn-stage.xoay > svg:active { cursor: grabbing; }
.cn-stage .cn-corner { position: absolute; top: 10px; right: 10px; }
.cn svg text { font-family: inherit; }
.cn svg .nh { fill: var(--label, #1d1d1f); font-weight: 700; font-size: 15px; }
.cn svg .nh-2 { fill: var(--label-2, #6e6e73); font-weight: 600; font-size: 12.5px; }
.cn svg .so { font-variant-numeric: tabular-nums; }
.cn svg .ke { stroke: var(--label-2, #6e6e73); stroke-width: 1.3; fill: none; stroke-linecap: round; }
.cn svg .ke.an { stroke-dasharray: 5 5; opacity: 0.6; }
.cn svg .dinh { fill: var(--label, #1d1d1f); }
.cn svg .mat { fill: color-mix(in srgb, var(--cn-1) 7%, transparent); stroke: none; }
.cn svg .tay { fill: var(--card, #fff); stroke: var(--cn-link); stroke-width: 2.5; cursor: grab; touch-action: none; }
.cn svg .tay-vung { fill: transparent; cursor: grab; touch-action: none; }
/* Mũi tên: thân + đầu cùng màu theo lớp c1…c5 */
.cn svg .mt line, .cn svg .mt path { stroke: var(--c, var(--cn-1)); stroke-width: 3.2; stroke-linecap: round; fill: none; }
.cn svg .mt polygon { fill: var(--c, var(--cn-1)); }
.cn svg .mt.dash line { stroke-dasharray: 7 6; stroke-width: 2.4; }
.cn svg .mt.mo { opacity: 0.22; }
.cn svg .mt.dam line { stroke-width: 4.4; }
.cn .c1 { --c: var(--cn-1); } .cn .c2 { --c: var(--cn-2); } .cn .c3 { --c: var(--cn-3); } .cn .c4 { --c: var(--cn-4); } .cn .c5 { --c: var(--cn-5); }
.cn svg .to { fill: var(--c, var(--cn-1)); }
.cn svg .vien { stroke: var(--c, var(--cn-1)); fill: none; }

/* Nút viên thuốc (như .dt-pill / .cw-pill của app), vùng bấm ≥ 44px nhờ ::before */
.cn-pill {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 6px; flex: none; min-height: 36px; padding: 0 14px; border: 0; border-radius: 999px;
  background: var(--fill, rgba(120, 120, 128, 0.14)); color: var(--label, #1d1d1f); font: inherit; font-size: 15px; font-weight: 600; white-space: nowrap; cursor: pointer;
  transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1), background 0.2s, color 0.2s, opacity 0.2s;
}
.cn-pill::before { content: ''; position: absolute; inset: -4px; }
.cn-pill:active:not(:disabled) { transform: scale(0.96); transition-duration: 0.1s; }
.cn-pill:disabled { opacity: 0.4; cursor: default; }
.cn-pill.on { background: color-mix(in srgb, var(--cn-1) 16%, transparent); color: var(--cn-1); }
.cn-pill.bay { background: color-mix(in srgb, var(--cn-bad) 10%, transparent); color: var(--cn-bad); }
.cn-pill.bay.on { background: color-mix(in srgb, var(--cn-bad) 20%, transparent); }
.cn-stage .cn-pill { background: var(--card, #fff); box-shadow: 0 0 0 0.5px var(--sep, rgba(0, 0, 0, 0.1)), 0 4px 12px -6px rgba(0, 0, 0, 0.3); }
/* Nút chính (Bước tiếp): gradient san hô như nút .btn của trang */
.cn-pri {
  background: linear-gradient(180deg, #f8b59b, #f2906b); color: #fff; box-shadow: 0 8px 18px -10px rgba(236, 120, 82, 0.8); text-shadow: 0 1px 1px rgba(180, 80, 45, 0.25);
}
.cn-pri:disabled { background: var(--fill, rgba(120, 120, 128, 0.14)); color: var(--label-2, #6e6e73); box-shadow: none; text-shadow: none; opacity: 1; }
.cn-chips { display: flex; gap: 8px; overflow-x: auto; padding: 4px 2px; margin: 0 -2px 4px; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.cn-chips::-webkit-scrollbar { display: none; }
@media (min-width: 640px) { .cn-chips { flex-wrap: wrap; overflow: visible; } }

/* Ô số đọc nhanh */
.cn-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(118px, 1fr)); gap: 8px; margin: 0 0 12px; }
.cn-tile { padding: 9px 12px; border-radius: 14px; background: var(--fill, rgba(120, 120, 128, 0.12)); min-width: 0; }
.cn-tile small { display: block; font-size: 13.5px; font-weight: 600; color: var(--label-2, #6e6e73); }
.cn-tile b { display: block; font-size: 20px; line-height: 1.25; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.cn-tile b i { font-style: normal; font-size: 14px; font-weight: 600; color: var(--label-2, #6e6e73); margin-left: 3px; }
.cn-tile.c1 b, .cn-tile.c2 b, .cn-tile.c3 b, .cn-tile.c4 b, .cn-tile.c5 b { color: var(--c); }

/* Thanh trượt */
.cn-sls { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 2px 18px; margin: 0 0 8px; }
.cn-sl { display: flex; align-items: center; gap: 12px; min-height: 44px; }
.cn-sl > span { flex: none; min-width: 112px; font-variant-numeric: tabular-nums; }
.cn-sl > span b { font-weight: 700; }
.cn-sl input { flex: 1; min-width: 0; height: 32px; margin: 0; accent-color: var(--cn-link); }

/* Lùi / Bước k/N / Bước tiếp */
.cn-steps { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 0 0 10px; padding: 8px; border-radius: 999px; background: var(--fill, rgba(120, 120, 128, 0.12)); }
.cn-steps .cn-pill { min-height: 44px; padding: 0 18px; }
.cn-steps .cn-pill:not(.cn-pri) { background: var(--card, #fff); }
.cn-k { font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Lời giải thích theo trạng thái: thẻ tông san hô nhạt */
.cn-note { margin: 0 0 12px; padding: 12px 16px; border-radius: 18px; background: color-mix(in srgb, var(--cn-acc) 12%, var(--card, #fff)); }
.cn-note > *:first-child { margin-top: 0; }
.cn-note > *:last-child { margin-bottom: 0; }
.cn-note p { margin: 0 0 6px; }
.cn-note .kq { font-size: 18px; font-weight: 700; color: var(--cn-link); }
.cn-note .bay { color: var(--cn-bad); font-weight: 600; }
.cn-note .katex { font-size: 1.08em; }
.cn-note.doi { animation: cn-doi 0.45s cubic-bezier(0.32, 0.72, 0, 1); }
@keyframes cn-doi { from { opacity: 0.35; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* Đoán trước */
.cn-dt-k { display: inline-flex; align-items: center; height: 30px; padding: 0 12px; margin: 0 0 8px; border-radius: 999px; background: var(--fill, rgba(120, 120, 128, 0.12)); font-size: 14.5px; font-weight: 700; font-variant-numeric: tabular-nums; }
.cn-dt-q { margin: 0 0 10px; font-weight: 600; }
.cn-opts { display: flex; flex-direction: column; gap: 10px; }
.cn-opt {
  display: flex; align-items: center; gap: 12px; width: 100%; min-height: 54px; padding: 11px 14px; border: 0; border-radius: 17px; background: var(--fill, rgba(120, 120, 128, 0.12)); color: var(--label, #1d1d1f);
  font: inherit; text-align: left; cursor: pointer; transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1), background 0.2s, box-shadow 0.2s, opacity 0.2s;
}
.cn-opt b { flex: none; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--card, #fff); font-size: 14.5px; }
.cn-opt:active:not(:disabled) { transform: scale(0.98); transition-duration: 0.1s; }
.cn-opt:disabled { cursor: default; }
.cn-opt.ok { background: color-mix(in srgb, var(--cn-ok) 16%, transparent); box-shadow: inset 0 0 0 1.5px var(--cn-ok); }
.cn-opt.ok b { background: var(--cn-ok); color: #fff; }
.cn-opt.bad { background: color-mix(in srgb, var(--cn-bad) 13%, transparent); box-shadow: inset 0 0 0 1.5px var(--cn-bad); }
.cn-opt.bad b { background: var(--cn-bad); color: #fff; }
.cn-dt.xong .cn-opt:not(.ok):not(.bad) { opacity: 0.55; }
.cn-dt-x { margin-top: 12px; }
.cn-dt-x .cn-note { margin-bottom: 10px; }
.cn-dt-x .kq.ok { color: var(--cn-ok); }
.cn-dt-x .kq.bad { color: var(--cn-bad); }
.cn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.cn-row .cn-pill { min-height: 44px; padding: 0 18px; }
.cn-msg { margin: 8px 0 0; }

@media (max-width: 480px) {
  .cn { padding: 12px 12px 14px; margin-left: -6px; margin-right: -6px; }
  .cn-sls { grid-template-columns: 1fr; }
  .cn-steps .cn-pill { padding: 0 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .cn-pill, .cn-opt, .cn-tabs button { transition: none; }
  .cn-note.doi { animation: none; }
}
@media print { .cn { display: none; } }