/* luxe-portal.css – giao diện Ocean Luxe sáng cho trang cổng index.html (20/10/2026), cùng bảng màu với css/luxe-app.css.
   Nạp sau khối <style> trong index.html nên ghi đè token; muốn đổi màu sửa token ở đây. */
:root{
  --brand:#0B66C6; --brand-dark:#084A92; --brand-ink:#FFFFFF; --accent:#B07A12;
  --bg:#EAF4FD; --card:#FFFFFF; --text:#0B2542; --muted:#4A6582; --line:#C9DDF0; --soft:#E3EFFA;
  --good:#1B8556; --good-bg:#DDF3E8; --warn:#A96412; --warn-bg:#FCF0D9; --bad:#C23A3A;
  --on-bg:#D7EAFE; --on-fg:#0A5DB5; --off-bg:#F8EBC8; --off-fg:#76530C;
  --hero-a:#06264A; --hero-b:#0B66C6; --radius:18px; --shadow:0 10px 30px rgba(8,52,102,.10); --shadow-lg:0 24px 60px rgba(6,38,74,.28);
  --gold:#C8A24A; --hero-gold:#EBD79B; --sky:#59B7F2;
  --f-ui:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif; --f-serif:'Playfair Display','Be Vietnam Pro',Georgia,serif;
  --wave:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M0 62C150 22 300 102 450 62S750 22 900 62s200 40 300-10V120H0Z' fill='%23ffffff' fill-opacity='.10'/%3E%3Cpath d='M0 88C200 56 350 118 550 88s350-34 650 4V120H0Z' fill='%23ffffff' fill-opacity='.08'/%3E%3C/svg%3E");
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --brand:#4DA3F5; --brand-dark:#2E7FD0; --brand-ink:#04162A; --accent:#D9B65D;
  --bg:#061423; --card:#0B2136; --text:#E4F0FC; --muted:#9BB6D2; --line:#1B4263; --soft:#0F2E49;
  --good:#5FD08B; --good-bg:#10321F; --warn:#F2C066; --warn-bg:#3A2D12; --bad:#FF8F85;
  --on-bg:#12345E; --on-fg:#A9CBFF; --off-bg:#4A3410; --off-fg:#FFCF7D; --hero-a:#04162A; --hero-b:#0B4C99;
  --shadow:0 10px 30px rgba(0,0,0,.4); color-scheme:dark}}
:root[data-theme="dark"]{
  --brand:#4DA3F5; --brand-dark:#2E7FD0; --brand-ink:#04162A; --accent:#D9B65D;
  --bg:#061423; --card:#0B2136; --text:#E4F0FC; --muted:#9BB6D2; --line:#1B4263; --soft:#0F2E49;
  --good:#5FD08B; --good-bg:#10321F; --warn:#F2C066; --warn-bg:#3A2D12; --bad:#FF8F85;
  --on-bg:#12345E; --on-fg:#A9CBFF; --off-bg:#4A3410; --off-fg:#FFCF7D; --hero-a:#04162A; --hero-b:#0B4C99;
  --shadow:0 10px 30px rgba(0,0,0,.4); color-scheme:dark}

body{font-family:var(--f-ui);background:
  radial-gradient(1100px 520px at 88% -80px,color-mix(in srgb,var(--sky) 26%,transparent),transparent 70%),
  radial-gradient(900px 480px at -10% 8%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 70%),var(--bg);background-attachment:fixed}
h1,h2,h3,h4{font-family:var(--f-ui)}
.hero h1,.sec-h h2,.course-head h1,.card h2{font-family:var(--f-serif)}

/* thanh trên + menu ngành */
.topbar{background:linear-gradient(120deg,#06264A,#0B4C99);border-bottom:3px solid #F2B632;color:#fff;box-shadow:0 8px 24px rgba(6,38,74,.22)}
.logo{font-family:var(--f-serif);font-size:1.45rem;color:#fff;letter-spacing:0;display:flex;align-items:center;gap:8px}
.logo::before{content:"";width:26px;height:26px;border-radius:50%;background:radial-gradient(circle at 34% 30%,#bfe4ff,#3b8fe0 45%,#0a3a78 80%);box-shadow:0 0 0 2px rgba(255,255,255,.35),0 0 14px rgba(120,190,255,.6)}
.logo span{color:#F2B632}
.search input{background:rgba(255,255,255,.95);color:#0B2542;border-color:transparent}
.search input:focus{outline:2px solid #F2B632}
.top-links a,.top-links button{color:#fff}
.burger{color:#fff;border-radius:8px;padding:4px 10px}.burger:hover,.burger[aria-expanded="true"]{background:rgba(255,255,255,.16)}
.top-links a:hover,.top-links button:hover{background:rgba(255,255,255,.16)}
.top-links .btn{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3B2700;border-radius:999px}
.top-links .btn:hover{background:linear-gradient(180deg,#FFE9AE,#F2C24E);color:#3B2700}
.gradebar{background:linear-gradient(90deg,#0B4C99,#0B66C6)}
.grades>li>button{font-weight:700}
.grades>li:hover>button,.grades>li.open>button{background:rgba(255,255,255,.18)}
.mega{border-radius:0 0 22px 22px;border-top:3px solid #F2B632}
.mega .lk{font-weight:600}
.tabs{background:var(--card);border-bottom:1px solid var(--line)}
.tabs a{border-radius:999px;color:var(--muted)}
.tabs a:hover,.tabs a.active{background:var(--soft);color:var(--brand-dark)}
.tabs a:nth-child(2){background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3B2700}
.promo{border-radius:20px;border-left:6px solid #F2B632}
.promo b{color:#7A5B12}

/* hero */
.hero{position:relative;overflow:hidden;border-radius:28px;padding:34px 34px 38px;box-shadow:var(--shadow-lg);border:1px solid color-mix(in srgb,var(--gold) 38%,transparent);min-height:340px;
  background:var(--wave) bottom/100% 120px no-repeat,radial-gradient(circle at 80% 20%,color-mix(in srgb,var(--sky) 38%,transparent),transparent 46%),linear-gradient(135deg,var(--hero-a) 0%,color-mix(in srgb,var(--hero-b) 70%,var(--hero-a)) 62%,var(--hero-b) 100%)}
.hero>*{position:relative;z-index:1}
.hero .eyebrow{margin:0 0 6px;font-size:.74rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--hero-gold);opacity:1}
.hero .eyebrow::before{content:"";display:inline-block;width:34px;height:1px;background:var(--hero-gold);vertical-align:middle;margin-right:10px}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.1;font-weight:700;margin-bottom:10px}
.hero h1 em{font-style:italic;color:var(--hero-gold);margin-right:.18em}
.hero p{font-size:1.05rem;max-width:52ch}
.hero .clock b{color:var(--hero-gold);font-family:'JetBrains Mono',ui-monospace,monospace}
.hero-planet{position:absolute!important;right:-6px;top:50%;transform:translateY(-50%);width:min(380px,40%);aspect-ratio:1;z-index:0!important;pointer-events:none}
.hero-planet canvas{width:100%;height:100%;display:block}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.hero-cta a{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;font-weight:800;font-size:.95rem;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.34);color:#fff}
.hero-cta a:hover{background:rgba(255,255,255,.24)}
.hero-cta a.gold{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3B2700;border-color:transparent;box-shadow:0 10px 24px rgba(0,0,0,.25)}
.chips a{border-radius:999px}
.chips a:nth-child(1){border-color:#F2C96B}.chips a:nth-child(2){border-color:#7DB9F2}.chips a:nth-child(3){border-color:#F29AB8}.chips a:nth-child(4){border-color:#B9A3F5}

/* thẻ */
.card,.tool,.cc,.acc,.sc,.qbtn{border-radius:18px}
.tool{border-top-width:5px}
.cc{border-left-width:6px;background:var(--card)}
.cc:hover,.tool:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.acc>button{font-family:var(--f-serif);font-size:1.15rem}
.acc[data-ng="kinhte"]{border-top:5px solid #B7791F}.acc[data-ng="cntt"]{border-top:5px solid #0B66C6}.acc[data-ng="truyenthong"]{border-top:5px solid #C2255C}.acc[data-ng="ngonngu"]{border-top:5px solid #6741D9}
.btn{border-radius:12px;background:linear-gradient(180deg,color-mix(in srgb,var(--brand) 78%,#fff),var(--brand))}
.btn.ghost{background:var(--soft)}
.course-head{border-radius:26px;background:linear-gradient(135deg,color-mix(in srgb,var(--c) 70%,#000),var(--c) 70%,color-mix(in srgb,var(--c) 70%,#fff) 140%)}
.course-head .btn{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3B2700}
.next-box{border-left:6px solid #F2B632}
footer{background:linear-gradient(120deg,#06264A,#0B3F7A)}
@media (max-width:760px){.hero{padding:24px 20px 28px;border-radius:22px;min-height:0}.hero-planet{width:190px;right:-50px;top:70px;opacity:.5;transform:none}}