/* Khoa hoc sbim.vn: cung bo mau trang chu (--navy, --blue, --line, --muted) */
.kh-page .tk-wrap{max-width:1240px;align-items:stretch;gap:0}
.kh-crumb{font-size:12px;color:var(--muted);margin:4px 0 16px}.kh-crumb a{color:#0b5da5}.kh-crumb a:hover{text-decoration:underline}
.kh-listhead{margin:0 0 26px}.kh-listhead h1{font-size:32px;line-height:1.2;margin:0 0 8px;letter-spacing:-.5px}.kh-listhead p{max-width:760px;color:var(--muted);margin:0}
.kh-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.kh-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;display:flex;flex-direction:column;gap:10px;border-top:4px solid var(--blue);box-shadow:0 12px 35px rgba(9,45,77,.06);transition:.2s}
.kh-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.kh-card h2{font-size:20px;line-height:1.3;margin:6px 0 2px}.kh-card h2 a:hover{color:var(--blue)}
.kh-card>p{color:#405267;font-size:14px;margin:0;flex:1}
.kh-tag{display:inline-block;padding:2px 10px;border-radius:20px;background:var(--sky);color:#0b5da5;font-size:11px;font-weight:800}
.kh-teacher{font-size:12px;color:var(--muted);margin:0}
.kh-card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:6px}
.kh-price{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.kh-price s{color:var(--muted);font-size:14px}.kh-price b{font-size:26px;color:#d0261f;letter-spacing:-.5px}
.kh-own{color:var(--green);font-weight:800;margin:0}

.kh-hero{display:grid;grid-template-columns:1fr 330px;gap:30px;align-items:start;background:linear-gradient(125deg,#092a4d 0%,#0a4779 60%,#0b294c 100%);color:#fff;border-radius:14px;padding:34px}
.kh-hero h1{font-size:34px;line-height:1.2;margin:0 0 12px;letter-spacing:-.6px}.kh-hero>div>p:not(.eyebrow){color:#dbe9f5;margin:0 0 16px}
.kh-meta{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13px;color:#c9dcec}.kh-meta b{color:#fff}
.kh-buy{background:#fff;color:var(--text);border-radius:12px;padding:22px;display:flex;flex-direction:column;gap:10px;box-shadow:0 18px 40px rgba(0,20,40,.3)}
.kh-buy .btn{width:100%}.kh-hint{font-size:12px;color:var(--muted);margin:0}
.kh-bar{height:8px;background:#e6eef5;border-radius:6px;overflow:hidden}.kh-bar i{display:block;height:100%;background:linear-gradient(90deg,#19966a,#2fbf86)}

.kh-sec{margin-top:34px}.kh-sec h2{font-size:22px;margin:0 0 14px;letter-spacing:-.3px}
.kh-learnlist{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:8px 26px}
.kh-learnlist li{position:relative;padding-left:26px;font-size:14px}.kh-learnlist li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800;font-size:16px}

.kh-syl details,.kh-faq details{border:1px solid var(--line);border-radius:10px;margin-bottom:10px;background:#fff;overflow:hidden}
.kh-syl summary,.kh-faq summary{cursor:pointer;padding:13px 16px;font-weight:700;display:flex;justify-content:space-between;gap:10px;background:#f6fafd;list-style:none}
.kh-syl summary::-webkit-details-marker,.kh-faq summary::-webkit-details-marker{display:none}
.kh-syl summary:before,.kh-faq summary:before{content:"▸";color:var(--blue);margin-right:4px}.kh-syl details[open]>summary:before,.kh-faq details[open]>summary:before{content:"▾"}
.kh-syl summary span{flex:1}.kh-syl summary small{color:var(--muted);font-weight:600;white-space:nowrap}
.kh-syl ol,.kh-side ol{list-style:none;margin:0;padding:0}
.kh-syl li a,.kh-side li a{display:flex;align-items:center;gap:10px;padding:9px 16px;border-top:1px solid #eef3f7;font-size:13.5px}
.kh-syl li a:hover,.kh-side li a:hover{background:#f2f8fe}
.kh-n{flex:0 0 auto;min-width:56px;color:#0b5da5;font-weight:700;font-size:12px}.kh-side .kh-n{min-width:30px}
.kh-t{flex:1;min-width:0}
.kh-ic{flex:0 0 auto;font-size:11px;color:var(--muted)}.kh-ic.ok{color:var(--green);font-weight:800;font-size:14px}
.kh-ic.free{background:#fff4d8;color:#8a5b00;border-radius:20px;padding:1px 8px;font-weight:800}
li.done .kh-t{color:var(--muted)}
.kh-faq p{margin:0;padding:4px 16px 14px;font-size:14px;color:#405267}.kh-faq a{color:#0b5da5}

.kh-mats{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.kh-mats li{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 16px;border-top:1px solid #eef3f7;font-size:14px}.kh-mats li:first-child{border-top:0}
.kh-mats small{color:var(--muted);margin-left:6px}

.kh-learn{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:24px;align-items:start}
.kh-video{position:relative;aspect-ratio:16/9;background:#07192c;border-radius:12px;overflow:hidden}
.kh-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.kh-lock{display:grid;place-items:center;text-align:center;color:#fff;padding:24px;background:linear-gradient(125deg,#092a4d,#0a4779)}
.kh-lock span{font-size:34px;display:block}.kh-lock b{font-size:19px;display:block;margin-bottom:6px}.kh-lock p{color:#cfe0ef;margin:0 auto 14px;max-width:460px;font-size:14px}
.kh-lock-btn{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.kh-lock .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.kh-kicker{margin:16px 0 2px;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:1px;color:var(--blue)}
.kh-main h1{font-size:24px;line-height:1.3;margin:0 0 8px}
.kh-free-note{font-size:13px;color:#8a5b00;background:#fff8e6;border-radius:8px;padding:8px 12px;margin:0 0 6px}.kh-free-note a{color:#0b5da5;font-weight:700}
.kh-pn{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-top:16px}.kh-pn form{margin:0}
.kh-side{border:1px solid var(--line);border-radius:12px;background:#fff;position:sticky;top:90px;max-height:calc(100vh - 110px);display:flex;flex-direction:column;overflow:hidden}
.kh-side-head{display:flex;justify-content:space-between;gap:8px;margin:0;padding:12px 14px 8px;font-weight:800}.kh-side-head a{color:var(--text)}.kh-side-head span{color:var(--muted);font-size:12px;font-weight:700}
.kh-side .kh-bar{margin:0 14px 10px}
.kh-side-list{overflow:auto}
.kh-side details>summary{cursor:pointer;padding:9px 14px;font-size:12.5px;font-weight:800;background:#f6fafd;border-top:1px solid var(--line);list-style:none}
.kh-side details>summary::-webkit-details-marker{display:none}
.kh-side li a{padding:8px 14px;font-size:12.5px}
.kh-side li.on a{background:#e7f2fd;box-shadow:inset 3px 0 0 var(--blue);font-weight:700}

@media(max-width:900px){.kh-hero,.kh-learn{grid-template-columns:1fr}.kh-side{position:static;max-height:none}.kh-cards,.kh-learnlist{grid-template-columns:1fr}}
@media(max-width:520px){.kh-hero{padding:22px 18px}.kh-hero h1{font-size:26px}.kh-listhead h1{font-size:26px}.kh-card{padding:18px}.kh-syl li a{padding:9px 12px}.kh-n{min-width:48px}}