/* ═══════════════════════════════════════════════════════════════════════════
   public/assets/css/hsk-skill.css — ĐẦU TRANG KỸ NĂNG tab HSK (24/10/2026, đợt H2 đồng bộ NAVS).
   Chép công thức .lh-* của NAVS (public/learn/ielts/listening.php): dải tối + ô kính "Tiến độ của bạn" + thẻ "Gợi ý"
   nổi trên mép dải. Token var(--color-*) — KHÔNG hex. Markup: includes/hsk_skill_hero.php.
   ═══════════════════════════════════════════════════════════════════════════ */
.hh--sub {
    --hk-surface: var(--color-surface);
    --hk-border:  color-mix(in srgb, var(--color-primary-deep) 9%, var(--color-border));
    --hk-sunken:  color-mix(in srgb, var(--color-primary) 4%, var(--color-soft));
    --hk-tint:    color-mix(in srgb, var(--color-primary) 9%, var(--color-surface));
    --hk-wash:    color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
    --hk-ink:     var(--color-ink);
    --hk-muted:   color-mix(in srgb, var(--color-muted) 84%, var(--color-ink));
    --hk-strong:  var(--lv-brand-fg, var(--color-primary-hover));   /* chữ đỏ — tự sáng lên ở nền tối */
    --hk-deep:    var(--color-primary-deep);
    /* Nền dải: đỏ sẫm CỐ ĐỊNH. --color-primary-deep LẬT sang đỏ nhạt ở nền tối (nó là màu chữ) ⇒ không dùng làm nền. */
    --hk-deep-bg: color-mix(in srgb, var(--color-primary-hover) 83%, black);
    --hk-night:   color-mix(in srgb, var(--hk-deep-bg) 52%, black);
    --hk-band:    color-mix(in srgb, var(--hk-deep-bg) 74%, black);
    --hk-mid:     color-mix(in srgb, var(--hk-deep-bg) 78%, var(--color-primary-hover));
    --hk-mint:    color-mix(in srgb, var(--color-primary) 35%, var(--color-on-dark));
    --hk-on:      var(--color-on-dark);
    --hk-on2:     color-mix(in srgb, var(--color-on-dark) 86%, transparent);
    --hk-on3:     color-mix(in srgb, var(--color-on-dark) 72%, transparent);
    --hk-glass:   color-mix(in srgb, var(--color-on-dark) 8%, transparent);
    --hk-glass2:  color-mix(in srgb, var(--color-on-dark) 14%, transparent);
    --hk-line-d:  color-mix(in srgb, var(--color-on-dark) 17%, transparent);
}
/* Nền tối (28/10/2026): --lv-brand-fg là công thức NAVS — với đỏ TTKK ở nền tối chỉ ~2,9:1 ⇒ chữ đỏ dùng --color-primary-deep (lật sáng). */
html[data-user-theme="dark"] .hh--sub { --hk-strong: var(--color-primary-deep); }
@media (prefers-color-scheme: dark) {
    html[data-user-theme="system"] .hh--sub { --hk-strong: var(--color-primary-deep); }
}

/* ① Dải tối đầu trang */
.hk-hero {
    position: relative; isolation: isolate; overflow: hidden; border-radius: 20px; color: var(--hk-on);
    display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: var(--space-6); align-items: start;
    padding: 22px 26px 66px;
    background:
        radial-gradient(55% 120% at 92% -20%, color-mix(in srgb, var(--color-primary) 50%, transparent), transparent 62%),
        radial-gradient(40% 90% at 4% 130%, color-mix(in srgb, var(--color-accent) 22%, transparent), transparent 70%),
        linear-gradient(155deg, var(--hk-mid), var(--hk-band) 55%, var(--hk-night));
}
.hk-hero::before {
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .85;
    background-image: radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--color-on-dark) 13%, transparent) 1px, transparent 1.5px);
    background-size: 18px 18px;
    -webkit-mask-image: linear-gradient(110deg, transparent 25%, black 80%);
            mask-image: linear-gradient(110deg, transparent 25%, black 80%);
}
.hk-hero :focus-visible { outline: 2px solid var(--hk-on); outline-offset: 2px; }
.hk-back { display: flex; width: max-content; align-items: center; gap: 6px; font-size: 12.5px; font-weight: var(--fw-bold); color: var(--hk-on3); text-decoration: none; }
.hk-back:hover { color: var(--hk-on); text-decoration: none; }
.hk-eyebrow { margin-top: 14px; display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: var(--fw-bold); color: var(--hk-mint); }
.hk-eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--hk-mint); box-shadow: 0 0 0 4px color-mix(in srgb, var(--hk-mint) 18%, transparent); }
.hk-h1 { margin: 8px 0 0; font-size: clamp(28px, 3.2vw, 36px); line-height: 1.08; font-weight: var(--fw-extrabold); letter-spacing: -.03em; color: var(--hk-on); }
.hk-lead { margin: 10px 0 0; max-width: 54ch; font-size: 14.5px; line-height: 1.6; color: var(--hk-on2); }
.hk-lead strong { color: var(--hk-on); font-weight: var(--fw-bold); }
.hk-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.hk-chip { height: 28px; display: inline-flex; align-items: center; gap: 5px; padding: 0 11px; border-radius: var(--radius-pill); background: var(--hk-glass); border: 1px solid var(--hk-line-d); font-size: 12px; font-weight: var(--fw-semibold); color: var(--hk-on2); }
.hk-chip b { color: var(--hk-on); font-weight: var(--fw-extrabold); font-variant-numeric: tabular-nums; }

.hk-panel { border-radius: 16px; border: 1px solid var(--hk-line-d); background: linear-gradient(160deg, var(--hk-glass2), var(--hk-glass)); padding: 14px 16px 12px; box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-on-dark) 10%, transparent); }
.hk-panel__k { font-size: 13px; font-weight: var(--fw-bold); color: var(--hk-on2); }
.hk-kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 10px; border-radius: 12px; overflow: hidden; border: 1px solid var(--hk-line-d); }
.hk-kpi { padding: 9px 10px; min-width: 0; }
.hk-kpi + .hk-kpi { border-left: 1px solid var(--hk-line-d); }
.hk-kpi b { display: block; font-size: 22px; line-height: 1.1; font-weight: var(--fw-extrabold); letter-spacing: -.02em; color: var(--hk-on); font-variant-numeric: tabular-nums; }
.hk-kpi span { display: block; margin-top: 3px; font-size: 11px; line-height: 1.3; color: var(--hk-on3); }
.hk-week__row { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-top: 12px; }
.hk-week__cap { font-size: 11px; color: var(--hk-on3); padding-bottom: 16px; }
.hk-week { display: grid; grid-template-columns: repeat(7, 18px); gap: 5px; }
.hk-week i { height: 18px; border-radius: 5px; background: color-mix(in srgb, var(--color-on-dark) 12%, transparent); border: 1px solid color-mix(in srgb, var(--color-on-dark) 14%, transparent); }
.hk-week i.is-on { background: var(--hk-mint); border-color: var(--hk-mint); }
.hk-week i.is-today { box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-on-dark) 55%, transparent); }
.hk-week em { font-style: normal; font-size: 9.5px; font-weight: var(--fw-bold); color: var(--hk-on3); text-align: center; }

/* ② Thẻ đang làm dở / gợi ý — nổi trên mép dải */
.hk-go {
    position: relative; z-index: 2; margin: -46px 18px var(--space-6); display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; gap: 16px; align-items: center;
    background: var(--hk-surface); border: 1px solid var(--hk-border); border-radius: 16px; padding: 16px 18px;
    box-shadow: 0 2px 4px color-mix(in srgb, var(--color-primary-deep) 6%, transparent), 0 24px 40px -28px color-mix(in srgb, var(--color-primary-deep) 60%, transparent);
}
.hk-go__ic { width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center; background: var(--hk-tint); color: var(--hk-strong); }
.hk-go__tag { display: inline-flex; height: 26px; align-items: center; padding: 0 9px; border-radius: var(--radius-pill); font-size: 12px; font-weight: var(--fw-bold); background: var(--hk-wash); color: var(--hk-strong); }
.hk-go__tag--doing { background: var(--color-warning-soft); color: var(--color-warning-deep); }
.hk-go__t { margin-top: 5px; font-size: 16.5px; line-height: 1.3; font-weight: var(--fw-extrabold); color: var(--hk-ink); }
.hk-go__m { margin-top: 3px; font-size: 12.5px; color: var(--hk-muted); }
.hk-go__bar { margin-top: 8px; height: 5px; border-radius: var(--radius-pill); background: var(--hk-sunken); overflow: hidden; max-width: 360px; }
.hk-go__bar i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--color-primary), var(--hk-strong)); }
.hk-go__act { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.hk-btn {
    height: 42px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 20px; border-radius: 12px;
    font-size: 14px; font-weight: var(--fw-extrabold); white-space: nowrap; text-decoration: none;
    background: linear-gradient(135deg, var(--color-primary), var(--hk-strong)); color: var(--hk-on);
    box-shadow: 0 10px 20px -12px color-mix(in srgb, var(--hk-strong) 90%, transparent);
    transition: filter var(--dur-fast) var(--ease);
}
.hk-btn:hover { filter: brightness(1.07); color: var(--hk-on); text-decoration: none; }
.hk-btn:focus-visible { outline: 2px solid var(--hk-strong); outline-offset: 2px; }
.hk-alt { font-size: 12px; line-height: 1.45; color: var(--hk-muted); text-align: right; max-width: 280px; }
.hk-alt a { color: var(--hk-strong); font-weight: var(--fw-bold); }
.hk-hero + :not(.hk-go) { margin-top: var(--space-6); }   /* trang không có thẻ gợi ý */

@media (max-width: 980px) {
    .hk-hero { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
    .hk-hero { padding: 16px 16px 60px; border-radius: 18px; gap: 14px; }
    .hk-lead { font-size: 13.5px; }
    .hk-kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .hk-kpi:nth-child(3) { border-left: 0; }
    .hk-kpi:nth-child(n+3) { border-top: 1px solid var(--hk-line-d); }
    .hk-week__row { flex-direction: column; align-items: flex-start; gap: 4px; }
    .hk-week__cap { padding-bottom: 0; }
    .hk-go { margin: -44px 8px var(--space-5); grid-template-columns: 44px minmax(0, 1fr); padding: 14px; }
    .hk-go__ic { width: 44px; height: 44px; }
    .hk-go__act { grid-column: 1 / -1; align-items: stretch; }
    .hk-alt { text-align: left; max-width: none; }
}
@media (prefers-reduced-motion: reduce) {
    .hk-btn { transition: none; }
}

/* ④ Kệ bìa 6 cấp HSK (hsk_level_shelf) — chép "Kho đề theo trình độ" của NAVS /ielts/listening (.lh-shelf / .lh-book) */
.hh--sub .hk-sec { margin-top: var(--space-8); }
.hh--sub .hk-sec__h { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 14px; }
.hh--sub .hk-sec__t { margin: 0; font-size: 19px; font-weight: var(--fw-extrabold); letter-spacing: -.015em; color: var(--hk-ink); }
.hh--sub .hk-sec__d { margin-top: 3px; font-size: 13px; color: var(--hk-muted); }
.hh--sub .hk-shelf { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 14px; }
.hh--sub .hk-book {
    display: flex; flex-direction: column; overflow: hidden; border-radius: 14px; background: var(--hk-surface); border: 1px solid var(--hk-border);
    color: var(--hk-ink); text-decoration: none;
    transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}
.hh--sub a.hk-book:hover { transform: translateY(-3px); border-color: var(--color-primary); color: var(--hk-ink);
    box-shadow: 0 18px 30px -20px color-mix(in srgb, var(--color-primary-deep) 55%, transparent); }
.hh--sub .hk-book.is-off { opacity: .55; }
.hh--sub .hk-book__cv { position: relative; aspect-ratio: 3 / 4; overflow: hidden; background: var(--hk-sunken); }
.hh--sub .hk-book__cv :is(img, svg) { display: block; width: 100%; height: 100%; object-fit: cover; }
.hh--sub .hk-book__n {
    position: absolute; top: 8px; right: 8px; height: 22px; display: inline-flex; align-items: center; padding: 0 8px; border-radius: var(--radius-pill);
    /* --color-inverse-surface (không lật) thay --color-ink: ink lật thành trắng ở nền tối ⇒ chữ trắng trên ô trắng */
    font-size: 10.5px; font-weight: var(--fw-extrabold); color: var(--color-on-dark); background: color-mix(in srgb, var(--color-inverse-surface) 55%, transparent);
}
.hh--sub .hk-book__fit {
    position: absolute; left: 8px; bottom: 8px; height: 22px; display: inline-flex; align-items: center; gap: 5px; padding: 0 8px; border-radius: var(--radius-pill);
    font-size: 10.5px; font-weight: var(--fw-extrabold); color: var(--hk-deep); background: var(--hk-surface);
    box-shadow: 0 4px 10px -4px color-mix(in srgb, black 40%, transparent);
}
.hh--sub .hk-book__fit i { width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); }
.hh--sub .hk-book__b { display: flex; flex-direction: column; gap: 3px; padding: 11px 12px 12px; }
.hh--sub .hk-book__t { font-size: 13.5px; font-weight: var(--fw-extrabold); line-height: 1.3; color: var(--hk-ink); }
.hh--sub .hk-book__m { font-size: 11.5px; color: var(--hk-muted); font-variant-numeric: tabular-nums; }
.hh--sub .hk-book__p {
    display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px; margin-top: 6px;
    font-size: 10.5px; font-weight: var(--fw-bold); color: var(--hk-muted); font-variant-numeric: tabular-nums;
}
.hh--sub .hk-book__p u { display: block; height: 4px; overflow: hidden; border-radius: var(--radius-pill); background: var(--hk-sunken); text-decoration: none; }
.hh--sub .hk-book__p u i { display: block; height: 100%; border-radius: inherit; background: var(--color-primary); }
.hh--sub .hk-book.is-fit { border-color: color-mix(in srgb, var(--color-primary) 55%, transparent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 14%, transparent); }
@media (max-width: 1100px) {
    .hh--sub .hk-shelf { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 12px; padding-bottom: 10px; scrollbar-width: none; }
    .hh--sub .hk-shelf::-webkit-scrollbar { display: none; }
    .hh--sub .hk-shelf .hk-book { flex: 0 0 calc((100% - 36px) / 4); scroll-snap-align: start; }
}
@media (max-width: 640px) {
    .hh--sub .hk-shelf .hk-book { flex: 0 0 42%; }
}
/* Màu bìa từng cấp (hsk_level_cover_svg) — chỉ token thương hiệu: đỏ trầm · terracotta · hổ phách · navy · đỏ-navy · xám */
.hh--sub .hk-cv--1 { --hkc-m: var(--color-primary);   --hkc-d: var(--color-primary-deep);   --hkc-l: color-mix(in srgb, var(--color-primary) 45%, var(--color-on-dark)); }
.hh--sub .hk-cv--2 { --hkc-m: var(--color-accent);    --hkc-d: var(--color-accent-deep);    --hkc-l: color-mix(in srgb, var(--color-accent) 45%, var(--color-on-dark)); }
.hh--sub .hk-cv--3 { --hkc-m: var(--color-warning);   --hkc-d: var(--color-warning-deep);   --hkc-l: color-mix(in srgb, var(--color-warning) 45%, var(--color-on-dark)); }
.hh--sub .hk-cv--4 { --hkc-m: var(--color-secondary); --hkc-d: var(--color-secondary-deep); --hkc-l: color-mix(in srgb, var(--color-secondary) 45%, var(--color-on-dark)); }
.hh--sub .hk-cv--5 { --hkc-m: color-mix(in srgb, var(--color-primary-deep) 65%, var(--color-secondary)); --hkc-d: color-mix(in srgb, var(--color-primary-deep) 55%, var(--color-ink));
                     --hkc-l: color-mix(in srgb, var(--color-primary) 40%, var(--color-on-dark)); }
.hh--sub .hk-cv--6 { --hkc-m: var(--color-locked-deep); --hkc-d: var(--color-ink);           --hkc-l: color-mix(in srgb, var(--color-locked) 50%, var(--color-on-dark)); }
.hh--sub .hk-sec__more { flex: none; font-size: 13px; font-weight: var(--fw-bold); color: var(--hk-strong); white-space: nowrap; text-decoration: none; }
.hh--sub .hk-sec__more:hover { text-decoration: underline; }
.hh--sub .hh-vset__num.zh { font-size: 20px; }


/* ⑤ Dải tràn HẾT bề ngang cột nội dung, như .lv-band của Lộ trình / Từ vựng (27/10/2026, chủ dự án: "tất cả các tab kéo dài cái
   thanh này ra giống như lộ trình hoặc từ vựng"). Trang gắn .hk-bleed vào khung ngoài cùng (con trực tiếp của body): khung bỏ
   max-width + đệm ngang, từng con tự lùi vào bằng --hk-pad (= đúng mép nội dung cũ), riêng dải .hk-hero chạy hết cột và đệm
   ngang bằng --hk-pad để chữ thẳng mép với nội dung dưới. Trang đặt $lvBand = true ⇒ thanh trên trong suốt, dải chui lên dưới
   nó (giống .lv-band) — CHỈ khi dải là con ĐẦU của khung (bỏ qua <link>/<style>/<script> đứng trước). Bài giáo trình (.cv-hh) và trang tập trung Lượng từ không gắn. */
.hk-bleed {
    --hk-gut: var(--space-6); --hk-max: var(--page-w); --hk-go-in: 18px;
    --hk-pad: max(var(--hk-gut), calc((100% - var(--hk-max)) / 2 + var(--hk-gut)));
    max-width: none !important; padding-inline: 0 !important;
}
.lt-page.hk-bleed { --hk-gut: var(--space-3); --hk-max: 960px; }
.bt.hk-bleed      { --hk-gut: 18px; --hk-max: 1180px; }
.hk-bleed > :not(.hk-hero):not(.hh--sub:has(> .hk-hero)) { margin-inline: var(--hk-pad); }
.hk-bleed > .hh--sub:has(> .hk-hero) { margin-inline: 0; }
.hk-bleed .hk-hero { border-radius: 0; padding-inline: var(--hk-pad); }
/* Màu dải = ĐÚNG công thức .lv-band của Trang chủ / Lộ trình / Từ vựng (learn-ui.css) — chủ dự án 27/10/2026: "sao cái màu nó khác
   các tab cũ… làm lại màu giống như tab trang chủ". --lv-band-grad khai ở learn-shell.css; khung khách không có ⇒ lùi về nền cũ. */
.hk-bleed .hk-hero {
    background:
        radial-gradient(58% 92% at 88% -12%, color-mix(in srgb, var(--color-primary) 48%, transparent), transparent 62%),
        radial-gradient(42% 72% at 26% 128%, color-mix(in srgb, var(--color-accent) 22%, transparent), transparent 70%),
        var(--lv-band-grad, linear-gradient(155deg, var(--hk-mid), var(--hk-band) 55%, var(--hk-night)));
}
.hk-bleed .hk-hero::before {
    opacity: .9; background-size: 20px 20px;
    background-image: radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--color-on-dark) 16%, transparent) 1px, transparent 1.5px);
    -webkit-mask-image: linear-gradient(118deg, transparent 12%, black 62%); mask-image: linear-gradient(118deg, transparent 12%, black 62%);
}
.hk-bleed .hk-hero::after {
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .16;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .5 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
.hk-bleed .hk-go.hk-go { margin-inline: calc(var(--hk-pad) + var(--hk-go-in)); }
body.lv-band-page .hk-bleed:has(> .hk-hero:nth-child(1 of :not(link, style, script)), > .hh--sub:nth-child(1 of :not(link, style, script)) > .hk-hero:nth-child(1 of :not(link, style, script))) { padding-top: 0 !important; }
body.lv-band-page .hk-bleed > :is(.hk-hero, .hh--sub):nth-child(1 of :not(link, style, script)) { margin-top: calc(-1 * var(--nav-h, 64px)); }
body.lv-band-page .hk-bleed > .hk-hero:nth-child(1 of :not(link, style, script)),
body.lv-band-page .hk-bleed > .hh--sub:nth-child(1 of :not(link, style, script)) > .hk-hero:nth-child(1 of :not(link, style, script)) { padding-top: calc(var(--nav-h, 64px) + 24px); padding-bottom: 76px; }
@media (max-width: 640px) {
    .hk-bleed, .lt-page.hk-bleed, .bt.hk-bleed { --hk-gut: var(--space-4); --hk-go-in: 0px; }
    .hk-bleed .hk-hero { border-radius: 0; }
}