/* CO-CHU-0311 */
/* 越南语课程（khoa-hoc-vi）专用样式：建立在 /assets/zh-xinhua.css 的新华网配色之上，只作用于 .kv 页面 */
.kvh { --kv-red: #055AD1; --kv-blue: #024AC2; --kv-soft: #EBF0FA; --kv-line: #D9E2F2; }
.kvh main.wrap { padding: 22px 20px 56px; }
.kv-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 10px 0 14px; border-bottom: 3px solid var(--kv-blue); margin-bottom: 18px; }
.kv-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #333; }
.kv-brand b { font-size: 21px; color: var(--kv-blue); letter-spacing: .5px; }
.kv-brand span { font-size: 14.5px; color: #666; }
.kv-crumb { font-size: 14.5px; color: #666; margin: 0 0 10px; }
.kv-crumb a { color: var(--kv-blue); }
.kv-hero { background: linear-gradient(135deg, #EBF0FA 0%, #FFFFFF 70%); border: 1px solid var(--kv-line); border-left: 6px solid var(--kv-red); border-radius: 10px; padding: 22px; display: grid; grid-template-columns: 1fr 260px; gap: 22px; align-items: center; }
.kv-hero h1 { margin: 6px 0 10px; font-size: 28px; line-height: 1.3; color: #1a1a1a; }
.kv-hero p { margin: 0 0 12px; color: #444; line-height: 1.7; }
.kv-hero .kv-photo { text-align: center; }
.kv-photo img { width: 100%; max-width: 260px; aspect-ratio: 1/1; object-fit: cover; object-position: 50% 18%; border-radius: 12px; border: 3px solid #fff; box-shadow: 0 6px 20px rgba(2,74,194,.18); }
.kv-photo figcaption { font-size: 14.5px; color: #555; margin-top: 6px; }
.kv-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.kv-sec { margin-top: 28px; }
.kv-sec > h2 { font-size: 22px; margin: 0 0 6px; padding-left: 10px; border-left: 5px solid var(--kv-red); }
.kv-sec > p.kv-lead { color: #555; margin: 0 0 14px; line-height: 1.7; }
.kv-stage { margin: 16px 0 8px; font-weight: 800; color: var(--kv-blue); font-size: 18px; }
.kv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.kv-card { background: #fff; border: 1px solid var(--kv-line); border-radius: 10px; padding: 14px; display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: #333; transition: box-shadow .15s, border-color .15s; }
.kv-card:hover { border-color: var(--kv-blue); box-shadow: 0 4px 14px rgba(2,74,194,.14); }
.kv-card .kv-no { font-size: 13.5px; font-weight: 800; color: var(--kv-red); }
.kv-card h3 { margin: 0; font-size: 18px; line-height: 1.4; color: #1a1a1a; }
.kv-card p { margin: 0; font-size: 14.5px; color: #555; line-height: 1.6; }
.kv-card .kv-meta { font-size: 13.5px; color: #777; margin-top: auto; }
.kv-badge { display: inline-block; background: var(--kv-red); color: #fff; border-radius: 4px; font-size: 12.5px; padding: 1px 6px; margin-left: 4px; vertical-align: middle; }
.kv-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.kv-tab { border: 1px solid var(--kv-line); background: #fff; border-radius: 999px; padding: 6px 12px; cursor: pointer; font-size: 15.5px; color: #333; }
.kv-tab.on { background: var(--kv-blue); color: #fff; border-color: var(--kv-blue); }
.kv-words { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.kv-word { background: #fff; border: 1px solid var(--kv-line); border-radius: 8px; padding: 10px 12px; display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; align-items: start; }
.kv-word .vi { font-size: 19px; font-weight: 800; color: var(--kv-blue); grid-column: 1; }
.kv-word .zh { font-size: 17px; color: #222; grid-column: 1; }
.kv-word .pr { font-size: 13.5px; color: #6a6a6a; grid-column: 1 / 3; line-height: 1.5; }
.kv-word button { grid-column: 2; grid-row: 1 / 3; }
.kv-say { border: 1px solid var(--kv-line); background: var(--kv-soft); color: var(--kv-blue); border-radius: 999px; padding: 4px 10px; cursor: pointer; font-size: 14.5px; white-space: nowrap; }
.kv-say:hover, .kv-say.playing { background: var(--kv-blue); color: #fff; }
.kv-points { margin: 0; padding-left: 20px; line-height: 1.8; }
.kv-sent { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.kv-sent li { background: #fff; border: 1px solid var(--kv-line); border-radius: 8px; padding: 8px 12px; display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.kv-sent .vi { font-weight: 700; color: #1a1a1a; }
.kv-sent .zh { color: #555; font-size: 15.5px; }
.kv-video { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.kv-vbox { background: #fff; border: 1px solid var(--kv-line); border-radius: 10px; overflow: hidden; }
.kv-vbox .ratio { position: relative; padding-top: 56.25%; background: #000; }
.kv-vbox iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.kv-vbox .cap { padding: 8px 12px; font-size: 14.5px; color: #444; line-height: 1.6; }
.kv-vbox .cap b { color: #1a1a1a; }
.kv-ex { background: #fff; border: 1px solid var(--kv-line); border-radius: 10px; padding: 14px; margin-bottom: 14px; }
.kv-ex h3 { margin: 0 0 10px; font-size: 18px; }
.kv-q { padding: 10px 0; border-top: 1px dashed var(--kv-line); }
.kv-q:first-of-type { border-top: 0; }
.kv-q .stem { font-weight: 700; margin-bottom: 6px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.kv-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.kv-opt { border: 1px solid var(--kv-line); background: #F7F9FC; border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: 17px; color: #222; }
.kv-opt.sel { border-color: var(--kv-blue); background: var(--kv-soft); color: var(--kv-blue); font-weight: 700; }
.kv-opt.ok, .kv-in.ok { border-color: #1E8E3E !important; background: #E6F4EA !important; color: #136C2E !important; }
.kv-opt.bad, .kv-in.bad { border-color: var(--kv-red) !important; background: #EAF2FD !important; color: #0E4DA5 !important; }
.kv-fill { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; font-size: 18px; }
.kv-in { border: 1px solid var(--kv-line); border-radius: 6px; padding: 5px 8px; font-size: 18px; width: 150px; }
.kv-bank { display: flex; gap: 6px; flex-wrap: wrap; margin: 6px 0 2px; }
.kv-chip { border: 1px dashed var(--kv-blue); background: #fff; color: var(--kv-blue); border-radius: 6px; padding: 3px 10px; cursor: pointer; font-size: 15.5px; }
.kv-fb { font-size: 14.5px; margin-top: 4px; min-height: 1em; }
.kv-fb.ok { color: #136C2E; } .kv-fb.bad { color: #0E4DA5; }
.kv-score { font-size: 19px; font-weight: 800; color: var(--kv-blue); margin-left: 10px; }
.kv-foot { margin-top: 36px; padding: 16px; border-top: 1px solid var(--kv-line); font-size: 15.5px; color: #555; text-align: center; line-height: 1.8; }
.kv-note { font-size: 14.5px; color: #666; background: #FFF8E6; border: 1px solid #F3DFA8; border-radius: 8px; padding: 8px 12px; margin-top: 10px; line-height: 1.6; }
.kv-route { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 12px 0; }
.kv-route div { background: #fff; border: 1px solid var(--kv-line); border-top: 4px solid var(--kv-blue); border-radius: 8px; padding: 12px; font-size: 15.5px; line-height: 1.6; }
.kv-route div b { display: block; color: var(--kv-blue); margin-bottom: 4px; }

/* 演示课 */
.kv-class { display: grid; grid-template-columns: 1fr 280px; gap: 14px; }
.kv-slide { background: #fff; border: 1px solid var(--kv-line); border-radius: 12px; min-height: 420px; padding: 22px; position: relative; overflow: hidden; }
.kv-slide h2 { margin: 0 0 12px; font-size: 24px; color: var(--kv-blue); }
.kv-slide .big { font-size: 46px; font-weight: 900; color: #1a1a1a; letter-spacing: 1px; }
.kv-slide .kv-pageno { position: absolute; right: 14px; bottom: 10px; font-size: 13.5px; color: #999; }
.kv-side { display: flex; flex-direction: column; gap: 10px; }
.kv-teacher { background: #fff; border: 1px solid var(--kv-line); border-radius: 12px; padding: 10px; text-align: center; }
.kv-teacher img { width: 100%; aspect-ratio: 4/3; object-fit: cover; object-position: 50% 20%; border-radius: 10px; transition: box-shadow .2s; }
.kv-teacher.talk img { box-shadow: 0 0 0 4px #1E8E3E, 0 0 18px rgba(30,142,62,.5); }
.kv-teacher .nm { font-weight: 800; margin-top: 6px; }
.kv-teacher .st { font-size: 13.5px; color: #666; }
.kv-ctrl { display: flex; gap: 6px; flex-wrap: wrap; }
.kv-ctrl button { flex: 1 1 auto; }
.kv-prog { height: 8px; background: var(--kv-soft); border-radius: 99px; overflow: hidden; }
.kv-prog i { display: block; height: 100%; width: 0; background: var(--kv-blue); transition: width .3s; }
.kv-time { font-size: 14.5px; color: #555; display: flex; justify-content: space-between; }
.kv-sub { background: #0B1B3F; color: #fff; border-radius: 10px; padding: 12px 14px; margin-top: 12px; line-height: 1.7; min-height: 70px; }
.kv-sub .zh { font-size: 18px; }
.kv-sub .vi { font-size: 14.5px; color: #C9D6F2; margin-top: 4px; }
.kv-letters { display: grid; grid-template-columns: repeat(10, 1fr); gap: 6px; }
.kv-letters span { border: 1px solid var(--kv-line); border-radius: 6px; text-align: center; padding: 8px 0; font-size: 22px; font-weight: 800; }
.kv-letters span.new { background: #EAF2FD; border-color: var(--kv-red); color: var(--kv-red); }
.kv-tones { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.kv-tone { border: 1px solid var(--kv-line); border-radius: 10px; padding: 10px; text-align: center; background: #FBFCFE; }
.kv-tone .sy { font-size: 40px; font-weight: 900; color: var(--kv-blue); }
.kv-tone svg { width: 100%; height: 54px; }
.kv-tone .nm { font-weight: 700; }
.kv-tone .ds { font-size: 13.5px; color: #666; }
.kv-hl { color: var(--kv-red); }
.kv-pairs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.kv-pairs div { border: 1px solid var(--kv-line); border-radius: 8px; padding: 10px; font-size: 19px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.kv-pairs b { color: var(--kv-blue); font-size: 22px; }
.kv-start { position: absolute; inset: 0; background: rgba(255,255,255,.94); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; text-align: center; padding: 20px; z-index: 2; }
.kv-start h2 { font-size: 26px; margin: 0; }
.kv-timer { font-size: 17px; font-weight: 800; color: var(--kv-red); }

@media (max-width: 860px) {
  .kv-hero { grid-template-columns: 1fr; }
  .kv-hero .kv-photo { order: -1; }
  .kv-photo img { max-width: 180px; }
  .kv-class { grid-template-columns: 1fr; }
  .kv-side { order: -1; display: grid; grid-template-columns: 110px 1fr; align-items: start; }
  .kv-teacher { grid-row: span 3; padding: 6px; }
  .kv-teacher .st { display: none; }
  .kv-slide { min-height: 360px; padding: 16px; }
  .kv-slide .big { font-size: 34px; }
  .kv-letters { grid-template-columns: repeat(6, 1fr); }
  .kv-letters span { font-size: 19px; }
  .kv-tones { grid-template-columns: 1fr 1fr; }
  .kv-route { grid-template-columns: 1fr; }
  .kv-pairs { grid-template-columns: 1fr; }
  .kv-hero h1 { font-size: 22px; }
}
@media print { .kv-top .zh-lang-btns, .kv-ctrl { display: none; } }
.kvh main section.kv-hero { padding: 22px; }

/* ===== 04/11/2026: RÀ SOÁT MÀU - tối đa 3 màu/trang (trắng-xám, xanh dương #0B6CF3, đỏ nhấn) ===== */
html body .kv-note { background: #F7F9FC !important; border-color: #D5DCE6 !important; }