:root{
  --ink:#0F2A47; --ink-deep:#0A1D33; --ink-mid:#16457A;
  --amber:#EF9F27; --amber-deep:#BA7517; --amber-soft:#FDF2DF;
  --teal:#1D9E75; --teal-soft:#E4F4EE; --teal-deep:#0F6E56;
  --sand:#F6F4EF; --paper:#FFFFFF;
  --line:#E4E1D9; --line-soft:#EFEDE7;
  --tx:#152234; --tx-2:#5C6877; --tx-3:#8B94A0;
  --r:10px; --r-lg:16px; --wrap:1340px; --gut:24px;
  --grad-ink:linear-gradient(135deg,#08182A 0%,#123A5F 52%,#1B5680 100%);
  --grad-ink-soft:linear-gradient(140deg,#0F2A47 0%,#16456F 100%);
  --grad-amber:linear-gradient(135deg,#F8B443 0%,#EF9F27 48%,#DB8214 100%);
  --grad-amber-hov:linear-gradient(135deg,#FCC259 0%,#F4A833 48%,#E4901D 100%);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Plus Jakarta Sans',system-ui,sans-serif;background:var(--paper);color:var(--tx);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit;text-align:left}
:focus-visible{outline:2.5px solid var(--amber);outline-offset:3px;border-radius:4px}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:-9999px;background:var(--ink);color:#fff;padding:12px 20px;z-index:200}
.skip:focus{left:0;top:0}
h1,h2,h3{line-height:1.18;letter-spacing:-.028em;font-weight:600}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:14px 26px;border-radius:var(--r);font-weight:600;font-size:.95rem;letter-spacing:-.01em;transition:transform .15s,background .2s,border-color .2s}
.btn:active{transform:translateY(1px)}
.btn-amber{background:var(--grad-amber);color:#3A2402;box-shadow:0 1px 0 var(--amber-deep)}
.btn-amber:hover{background:var(--grad-amber-hov)}
.btn-ink{background:var(--grad-ink-soft);color:#fff}.btn-ink:hover{background:linear-gradient(140deg,#16456F,#1D5B8C)}
.btn-line{border:1.5px solid var(--line);color:var(--tx);background:var(--paper)}
.btn-line:hover{border-color:var(--ink);background:var(--sand)}
.btn-sm{padding:10px 18px;font-size:.88rem}

.announce{background:var(--ink-deep);color:#D9E3EF;font-size:.83rem;padding:11px 0;overflow:hidden}
.mq{display:flex;width:max-content;animation:mq 42s linear infinite}
.announce:hover .mq{animation-play-state:paused}
.mq-set{display:flex;align-items:center;gap:34px;padding-right:34px;white-space:nowrap}
.mq b{color:var(--amber);font-weight:600}
.mq i{color:var(--amber);font-style:normal;opacity:.7}
.mq a{text-decoration:underline;text-underline-offset:3px}
@keyframes mq{from{transform:translateX(0)}to{transform:translateX(-50%)}}

.hdr{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft)}
.hdr .wrap{display:flex;align-items:center;gap:18px;height:82px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:1.32rem;letter-spacing:-.04em;color:var(--ink);flex:none}
.logo-mark{width:36px;height:36px;border-radius:9px;background:var(--grad-ink-soft);display:grid;place-items:center;position:relative;overflow:hidden;flex:none}
.logo-mark::after{content:"";position:absolute;inset:auto 0 0 0;height:11px;background:var(--grad-amber)}
.logo-mark span{color:#fff;font-size:1.05rem;font-weight:700;z-index:1;letter-spacing:-.05em;line-height:1}
.logo em{font-style:normal;font-weight:400;color:var(--tx-2);font-size:1.02rem}
.nav{display:flex;align-items:center;gap:6px;margin:0 auto}
.nav a{padding:10px 15px;border-radius:8px;font-size:.97rem;font-weight:500;white-space:nowrap}
.nav a:hover{background:var(--sand)}
.nav a.on{background:var(--sand);font-weight:600}
.hdr-actions{display:flex;align-items:center;gap:8px;flex:none}
.icon-btn{width:42px;height:42px;border-radius:9px;display:grid;place-items:center;color:var(--tx-2);position:relative}
.icon-btn:hover{background:var(--sand);color:var(--ink)}
.cart-dot{position:absolute;top:6px;right:7px;width:16px;height:16px;border-radius:50%;background:var(--amber);color:#3A2402;font-size:.62rem;font-weight:700;display:grid;place-items:center;line-height:1}
.hdr-login{font-size:.97rem;font-weight:500;padding:10px 13px;border-radius:8px}
.hdr-login:hover{background:var(--sand)}
.burger{display:none}
@media(max-width:1120px){.nav,.hdr-login{display:none}.burger{display:grid;place-items:center;width:40px;height:40px;border-radius:9px}.burger:hover{background:var(--sand)}}
.mnav{display:none;border-top:1px solid var(--line-soft);background:var(--paper);padding:10px 0 18px}
.mnav.open{display:block}
.mnav a{display:block;padding:12px 20px;font-weight:500;border-bottom:1px solid var(--line-soft)}

/* ===== banner bộ sưu tập ===== */
.coll{background:var(--grad-ink);color:#fff;position:relative;overflow:hidden}
.coll .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,410px);gap:52px;align-items:center;padding:56px var(--gut) 60px;position:relative;z-index:2}
.coll::after{content:"";position:absolute;right:-160px;top:-120px;width:620px;height:620px;border-radius:50%;background:#16457A;opacity:.45}
.coll .eyebrow{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--amber);display:flex;align-items:center;gap:10px;margin-bottom:14px}
.coll .eyebrow::before{content:"";width:22px;height:2px;background:var(--grad-amber)}
.coll h1{font-size:clamp(1.9rem,3.8vw,2.85rem);letter-spacing:-.036em;color:#fff}
.coll p{color:#BFCEDE;margin-top:16px;max-width:56ch;line-height:1.72}
.feat{display:flex;flex-direction:column;gap:12px}
.fc{display:flex;gap:13px;align-items:center;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:13px;padding:13px;position:relative;transition:background .2s}
.fc:hover{background:rgba(255,255,255,.12)}
.fc .fi{width:62px;height:62px;border-radius:9px;background:var(--ink-deep);display:grid;place-items:center;flex:none;color:var(--amber);font-size:.7rem;font-weight:700;letter-spacing:.05em}
.fc b{font-size:.9rem;font-weight:600;line-height:1.35;display:block}
.fc .fp{margin-top:5px;font-size:.86rem;font-variant-numeric:tabular-nums}
.fc .fp span{font-weight:700;color:var(--amber)}
.fc .fp s{color:#8FA2B7;font-size:.78rem;margin-left:6px}
.fc .tagn{position:absolute;top:-8px;right:12px;background:var(--grad-amber);color:#3A2402;font-size:.66rem;font-weight:700;padding:3px 9px;border-radius:5px}
@media(max-width:960px){.coll .wrap{grid-template-columns:1fr;gap:32px;padding:42px var(--gut) 46px}}

/* ===== học theo chủ đề ===== */
.topics{background:var(--sand);border-bottom:1px solid var(--line);padding:44px 0 48px}
.topics h2{font-size:1.4rem;margin-bottom:20px}
.gts{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.gt{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:20px 18px;display:flex;flex-direction:column;gap:4px;transition:border-color .2s,transform .2s}
.gt:hover{border-color:var(--ink);transform:translateY(-3px)}
.gt[aria-pressed="true"]{background:var(--grad-ink-soft);border-color:#16456F;color:#fff}
.gt-ic{width:40px;height:40px;border-radius:11px;background:var(--amber-soft);color:var(--amber-deep);display:grid;place-items:center;margin-bottom:10px}
.gt[aria-pressed="true"] .gt-ic{background:rgba(255,255,255,.14);color:var(--amber)}
.gt b{font-size:.98rem;font-weight:600;line-height:1.3}
.gt span{font-size:.8rem;color:var(--tx-3)}
.gt[aria-pressed="true"] span{color:#9FB3C8}
@media(max-width:1000px){.gts{grid-template-columns:repeat(3,1fr)}}
@media(max-width:620px){.gts{grid-template-columns:repeat(2,1fr)}}

/* ===== bố cục danh sách ===== */
.main{display:grid;grid-template-columns:250px minmax(0,1fr);gap:34px;padding:38px 0 80px;align-items:start}
@media(max-width:1000px){.main{grid-template-columns:1fr;gap:20px}}

.filters{position:sticky;top:100px}
@media(max-width:1000px){.filters{position:static}}
.f-hd{display:flex;align-items:center;gap:9px;font-size:.95rem;font-weight:600;padding-bottom:13px;border-bottom:1px solid var(--line);margin-bottom:6px}
.f-hd button{margin-left:auto;font-size:.82rem;font-weight:500;color:var(--amber-deep)}
.f-hd button:hover{text-decoration:underline}
.fg{border-bottom:1px solid var(--line-soft);padding:6px 0}
.fg-t{display:flex;align-items:center;width:100%;padding:12px 0;font-size:.93rem;font-weight:600}
.fg-t svg{margin-left:auto;color:var(--tx-3);transition:transform .2s}
.fg-t[aria-expanded="false"] svg{transform:rotate(-90deg)}
.fg-b{padding-bottom:12px;display:flex;flex-direction:column;gap:3px}
.fg-b[hidden]{display:none}
.ck{display:flex;align-items:center;gap:10px;padding:7px 8px;border-radius:8px;font-size:.9rem;color:var(--tx-2);cursor:pointer}
.ck:hover{background:var(--sand);color:var(--tx)}
.ck input{width:17px;height:17px;accent-color:var(--ink);cursor:pointer;flex:none}
.ck .n{margin-left:auto;font-size:.78rem;color:var(--tx-3);font-variant-numeric:tabular-nums}

.bar{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;padding-bottom:18px;border-bottom:1px solid var(--line-soft);margin-bottom:22px}
.bar .cnt{font-size:.94rem;color:var(--tx-2)}
.bar .cnt b{color:var(--tx);font-weight:600;font-variant-numeric:tabular-nums}
.sortbox{display:flex;align-items:center;gap:9px;font-size:.9rem;color:var(--tx-2)}
.sortbox select{font:inherit;font-size:.9rem;font-weight:600;color:var(--tx);border:1px solid var(--line);border-radius:9px;padding:9px 34px 9px 13px;background:var(--paper);cursor:pointer;
  appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235C6877' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.chips:empty{display:none}
.chip-x{display:inline-flex;align-items:center;gap:8px;background:var(--amber-soft);border:1px solid #F3DFB6;color:#6B5322;font-size:.83rem;font-weight:500;padding:6px 10px 6px 13px;border-radius:20px}
.chip-x button{display:grid;place-items:center;color:#8A6B2C}
.chip-x button:hover{color:#3A2402}

/* ===== thẻ khóa học ===== */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.cc{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;display:flex;flex-direction:column;transition:border-color .2s,box-shadow .25s,transform .2s}
.cc:hover{border-color:#C9D2DC;box-shadow:0 16px 36px -24px rgba(15,42,71,.45);transform:translateY(-3px)}
.cc-th{aspect-ratio:16/10;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;padding:22px}
.cc-th .bg{position:absolute;inset:0;width:100%;height:100%;opacity:.15}
.cc-kn{position:relative;font-size:.68rem;font-weight:700;letter-spacing:.14em;color:var(--amber)}
.cc-tl{position:relative;color:#fff;font-weight:600;font-size:1.1rem;text-align:center;line-height:1.32;letter-spacing:-.025em;max-width:16ch}
.bds{position:absolute;top:11px;left:11px;right:11px;display:flex;gap:6px;flex-wrap:wrap;z-index:2}
.bd{font-size:.68rem;font-weight:700;padding:4px 9px;border-radius:5px;letter-spacing:.01em}
.bd-save{background:var(--grad-amber);color:#3A2402}
.bd-new{background:var(--teal-soft);color:var(--teal-deep)}
.cc-b{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.cc-cat{font-size:.74rem;font-weight:600;color:var(--amber-deep);letter-spacing:.04em;text-transform:uppercase}
.cc h3{font-size:1.05rem;margin-top:6px;line-height:1.35}
.cc-d{font-size:.87rem;color:var(--tx-2);margin-top:9px;line-height:1.62;flex:1}
.cc-meta{display:flex;gap:13px;flex-wrap:wrap;margin-top:14px;font-size:.79rem;color:var(--tx-2)}
.mi{display:flex;align-items:center;gap:6px;font-variant-numeric:tabular-nums}
.mi svg{color:var(--tx-3)}
.cc-tools{display:flex;gap:6px;flex-wrap:wrap;margin-top:11px}
.tool{font-size:.7rem;background:var(--sand);border:1px solid var(--line-soft);padding:3px 8px;border-radius:5px;color:var(--tx-2);font-weight:500}
.cc-f{margin-top:16px;padding-top:14px;border-top:1px solid var(--line-soft);display:flex;align-items:center;justify-content:space-between;gap:10px}
.pr{display:flex;align-items:baseline;gap:7px;flex-wrap:wrap}
.pr b{font-size:1.12rem;font-weight:700;letter-spacing:-.03em;font-variant-numeric:tabular-nums;color:var(--ink)}
.pr s{font-size:.79rem;color:var(--tx-3);font-variant-numeric:tabular-nums}

.none{background:var(--sand);border:1.5px dashed var(--line);border-radius:var(--r-lg);padding:48px 30px;text-align:center}
.none h3{font-size:1.1rem;margin-bottom:8px}
.none p{font-size:.92rem;color:var(--tx-2);max-width:46ch;margin:0 auto 18px}

/* ===== dải combo ===== */
.combo{background:var(--sand);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.combo .wrap{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:30px;align-items:center;padding:44px var(--gut)}
.combo h2{font-size:1.5rem}
.combo p{font-size:.95rem;color:var(--tx-2);margin-top:10px;max-width:60ch}
.combo .cta{display:flex;gap:11px;flex-wrap:wrap}
@media(max-width:820px){.combo .wrap{grid-template-columns:1fr;gap:22px}}

.ft{background:linear-gradient(180deg,#0A1D33 0%,#0C2440 100%);color:#B7C5D5;font-size:.9rem;padding:60px 0 0}
.ft-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:42px;padding-bottom:44px}
.ft .logo{color:#fff;margin-bottom:16px}
.ft .logo em{color:#8FA2B7}
.ft-about{line-height:1.75;max-width:38ch}
.ft h4{color:#fff;font-size:.9rem;font-weight:600;margin-bottom:14px}
.ft ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.ft a:hover{color:var(--amber)}
.ft-legal{border-top:1px solid rgba(255,255,255,.11);padding:24px 0 40px;font-size:.8rem;line-height:1.8;color:#8FA2B7}
.ft-legal .moit{display:inline-flex;align-items:center;gap:8px;margin-top:14px;padding:7px 12px;border:1px solid rgba(255,255,255,.18);border-radius:6px;font-size:.75rem}
@media(max-width:860px){.ft-top{grid-template-columns:1fr 1fr;gap:28px}}
@media(max-width:520px){.ft-top{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.mq{width:100%;justify-content:center}*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}