:root{
  --bg:#f1f4fb; --card:#ffffff; --soft:#f1f4ff; --line:#d3daf0;
  --vio:#6d4cff; --vio-d:#4b2fd6; --vio-l:#ece7ff; --cy:#06b6d4; --cy-l:#e0f9fd; --pink:#f0287a; --pink-l:#ffe6f0;
  --gold:#ffc83d; --orange:#ff6a1a; --red:#e8173d; --green:#16a36a; --green-l:#e3f8ee;
  --ink:#1b1840; --ink-2:#4f4b73; --ink-3:#8a87a8;
  --grad:linear-gradient(120deg,#06b6d4 0%,#6d4cff 48%,#f0287a 100%);
  --hot:linear-gradient(135deg,#0ea5e9,#2563eb 55%,#1d4ed8);
  --shadow:0 16px 40px -18px rgba(30,50,140,.38); --shadow-lg:0 40px 80px -30px rgba(30,50,140,.5);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{font-family:"Be Vietnam Pro",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
[hidden]{display:none!important}
.gtxt{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;padding-top:.12em}

/* ===== nền: trời xanh nhạt + chấm bi mờ + 2 quầng sáng ===== */
.scene{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none;background:linear-gradient(180deg,#d7e4ff 0%,#e9effd 38%,#f1f4fb 100%)}
.scene::before,.scene::after{content:"";position:absolute;border-radius:50%;filter:blur(70px)}
.scene::before{width:560px;height:560px;right:-160px;top:-180px;background:rgba(59,130,246,.35)}
.scene::after{width:480px;height:480px;left:-180px;bottom:-160px;background:rgba(14,165,233,.22)}
.grid-bg{position:absolute;inset:0;background-image:radial-gradient(rgba(37,99,235,.22) 1.3px,transparent 1.8px);background-size:24px 24px;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.35) 45%,transparent 85%);mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.35) 45%,transparent 85%)}
#stars{display:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== thanh trên ===== */
.top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:58px;gap:10px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;text-decoration:none;font-size:17px}
.logo-mark{width:32px;height:32px;border-radius:9px;background:#107c41;color:#fff;display:grid;place-items:center;font-weight:900;font-size:17px;box-shadow:inset 0 -3px 0 rgba(0,0,0,.2)}
.top-badge{font-size:12.5px;font-weight:800;color:#fff;background:var(--hot);padding:6px 11px;border-radius:99px;white-space:nowrap}

/* ===== nút ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-family:inherit;font-weight:800;font-size:16px;padding:16px 26px;border-radius:14px;border:0;cursor:pointer;text-decoration:none;transition:transform .15s,box-shadow .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn:disabled{cursor:not-allowed;opacity:.6}
.btn-main{color:#fff;background:var(--hot);box-shadow:0 14px 30px -12px rgba(37,99,235,.7),inset 0 -3px 0 rgba(0,0,0,.15)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 20px 38px -12px rgba(37,99,235,.8),inset 0 -3px 0 rgba(0,0,0,.15)}
.btn-ghost{background:#fff;color:#0068ff;border:2px solid #b9d4ff}
.btn-ghost:hover{border-color:#0068ff}
.btn-ghost .zl{width:24px;height:24px;flex:none}
.btn-green{color:#fff;background:linear-gradient(135deg,#21a35d,#107c41);box-shadow:0 14px 30px -12px rgba(16,124,65,.7)}
.shine{position:relative;overflow:hidden}
.shine::after{content:"";position:absolute;top:0;left:-60%;width:40%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.6),transparent);transform:skewX(-20deg);animation:shine 3.2s ease-in-out infinite}
@keyframes shine{0%,60%{left:-60%}100%{left:130%}}
.cta2{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.cta2 .btn{flex:1 1 230px}

/* ===== hero ===== */
.hero{padding:28px 0 26px}
.hero-grid{display:grid;gap:18px;align-items:center}
@media(min-width:920px){.hero-grid{grid-template-columns:1.08fr .92fr;gap:34px}.hero{padding:50px 0 46px}}
.eyebrow{display:inline-block;font-size:15px;font-weight:700;font-style:italic;color:var(--vio-d);background:#fff;border:1.5px solid #d8cfff;padding:8px 15px;border-radius:16px;box-shadow:0 8px 20px -12px rgba(109,76,255,.5);line-height:1.45}
.h1{line-height:1.08;font-weight:900;letter-spacing:-.025em;margin:16px 0 12px}
.h1 .t1{display:block;font-size:clamp(42px,11vw,76px)}
.h1 .t2{display:block;font-size:clamp(22px,5.6vw,34px);font-weight:800;color:var(--ink);margin-top:6px;letter-spacing:-.01em}
.lead{font-size:clamp(17px,4.4vw,21px);color:var(--ink-2);max-width:560px}
.lead b{color:var(--ink)}
.off50{display:inline-block;color:#fff;background:var(--hot);padding:0 10px;border-radius:8px;font-weight:900;transform:rotate(-1.5deg)}

/* hộp giá đầu trang + dải ngày */
.hprice{margin-top:20px;max-width:540px;background:#fff;border:2px solid #c7d7fe;border-radius:22px;overflow:hidden;box-shadow:var(--shadow)}
.hp-date{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;background:var(--hot);color:#fff;padding:10px 14px;text-align:center;line-height:1.25}
.hp-date small{font-size:12.5px;font-weight:700;opacity:.95;letter-spacing:.04em;text-transform:uppercase}
.hp-date b{font-size:17px;font-weight:800}
.hp-date b em{font-style:normal;background:#fff;color:#1d4ed8;padding:0 7px;border-radius:6px;margin:0 2px}
.hp-row{display:flex;align-items:stretch}
.hprice .hp-l{flex:1;padding:14px 16px}
.hprice small.lb{display:block;font-size:13px;color:var(--ink-2);font-weight:600}
.hprice s{color:var(--ink-3);font-weight:700;font-size:16px}
.hprice .pp{display:block;font-size:clamp(34px,9vw,44px);line-height:1.05;font-weight:900;color:var(--red);letter-spacing:-.02em}
.hprice .hp-r{flex:none;width:110px;display:grid;place-items:center;text-align:center;background:var(--pink-l);color:var(--red);font-weight:900;line-height:1.05;padding:8px;border-left:2px dashed #ffc2d4}
.hprice .hp-r span{font-size:32px;display:block;letter-spacing:-.03em}
.hprice .hp-r i{font-style:normal;font-size:12.5px;display:block;margin-top:2px;color:var(--ink-2)}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.meta span{font-size:13.5px;font-weight:700;color:var(--ink-2);background:#fff;border:1px solid var(--line);padding:6px 11px;border-radius:10px}
.meta b{color:var(--ink)}

/* hình: thầy + vòng ứng dụng */
.art{position:relative;display:grid;place-items:center;min-height:420px;overflow:hidden;padding:30px 0}
.orbit{position:relative;width:min(400px,76vw);aspect-ratio:1}
.orbit::before,.orbit::after{content:"";position:absolute;border-radius:50%;border:2px dashed rgba(109,76,255,.35)}
.orbit::before{inset:0;animation:spin 50s linear infinite}
.orbit::after{inset:13%;border-style:solid;border-color:rgba(6,182,212,.25);background:radial-gradient(circle,#fff 40%,rgba(255,255,255,0) 72%)}
.core{position:absolute;z-index:1;inset:22%;border-radius:50%;padding:5px;background:var(--grad);box-shadow:0 20px 60px -10px rgba(109,76,255,.55)}
.core img{width:100%;height:100%;border-radius:50%;object-fit:cover;object-position:50% 20%;border:5px solid #fff}
.ring{position:absolute;inset:0;animation:spin 36s linear infinite}
.app{position:absolute;width:54px;height:54px;margin:-27px 0 0 -27px;border-radius:15px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);box-shadow:0 12px 24px -10px rgba(70,50,170,.4);animation:spin 36s linear infinite reverse}
.app svg{width:32px;height:32px}
@keyframes spin{to{transform:rotate(360deg)}}
.tag-ai{position:absolute;z-index:3;font-size:13px;font-weight:800;padding:7px 12px;border-radius:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);max-width:230px;line-height:1.35;animation:bob 6s ease-in-out infinite}
.tag-ai i{font-style:normal;color:var(--green)}
@keyframes bob{50%{transform:translateY(-10px)}}
@media(max-width:560px){.art{min-height:0;padding:34px 0 30px}.app{width:44px;height:44px;margin:-22px 0 0 -22px;border-radius:12px}.app svg{width:26px;height:26px}.tag-ai{font-size:11.5px;padding:5px 9px;max-width:170px}}

/* ===== section ===== */
section{padding:54px 0}
.sec-head{text-align:center;max-width:740px;margin:0 auto 30px}
.kicker{font-size:12.5px;font-weight:800;letter-spacing:.1em;color:var(--vio-d);background:var(--vio-l);border:1px solid #d8cfff;padding:4px 12px;border-radius:99px;display:inline-block}
.h2{font-size:clamp(26px,6.4vw,42px);line-height:1.18;font-weight:900;letter-spacing:-.02em;margin:12px 0 8px}
.sub{color:var(--ink-2);font-size:17px}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== so sánh 2 mức học phí ===== */
.cmp{display:grid;gap:18px;max-width:920px;margin:0 auto;align-items:center}
@media(min-width:780px){.cmp{grid-template-columns:.85fr 1.15fr}}
.pc{border-radius:24px;position:relative}
.pc-old{background:#f1f0f7;border:1px solid var(--line);padding:22px 20px;color:var(--ink-3)}
.pc-old .who{font-weight:800;font-size:17px;color:var(--ink-2)}
.pc-old .pp{font-size:clamp(32px,8vw,40px);font-weight:900;text-decoration:line-through;text-decoration-color:var(--red);text-decoration-thickness:3px;color:var(--ink-3);margin:6px 0}
.pc-old ul,.pc-new ul{list-style:none}
.pc-old li{padding-left:24px;position:relative;margin:6px 0;font-size:14.5px}
.pc-old li::before{content:"•";position:absolute;left:8px}
.pc-new{padding:3px;background:var(--grad);box-shadow:var(--shadow-lg)}
.pc-in{background:#fff;border-radius:21px;padding:26px 20px 20px}
.here{position:absolute;left:50%;top:-14px;transform:translateX(-50%);z-index:3;white-space:nowrap;background:var(--ink);color:#fff;font-weight:800;font-size:12.5px;padding:4px 12px;border-radius:99px;box-shadow:0 10px 20px -8px rgba(0,0,0,.4);animation:hereBob 1.8s ease-in-out infinite}
.here::after{content:"";position:absolute;left:50%;bottom:-5px;margin-left:-5px;border:5px solid transparent;border-bottom:0;border-top-color:var(--ink)}
@keyframes hereBob{50%{transform:translate(-50%,-4px)}}
.pc-new .who{font-weight:800;font-size:19px}
.pdate{display:inline-flex;align-items:center;gap:8px;margin:10px 0 4px;background:var(--hot);color:#fff;border-radius:12px;padding:6px 14px}
.pdate i{font-style:normal;font-size:18px}
.pdate small{display:block;font-size:11.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;opacity:.95}
.pdate b{display:block;font-size:17px;font-weight:800;line-height:1.2}
.pc-new .row{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap;margin:10px 0 4px}
.pc-new .pp{font-size:clamp(44px,12vw,60px);line-height:1;font-weight:900;color:var(--red);letter-spacing:-.03em}
.pc-new .badge{font-size:15px;font-weight:900;color:#fff;background:var(--pink);padding:4px 10px;border-radius:10px;margin-bottom:6px}
.save{display:inline-flex;gap:6px;align-items:center;font-size:14.5px;font-weight:800;color:var(--green);background:var(--green-l);border:1px solid #b8ebd3;padding:5px 12px;border-radius:10px}
.pc-new li{position:relative;padding-left:30px;margin:9px 0;font-size:15.5px;color:var(--ink)}
.pc-new li::before{content:"✓";position:absolute;left:0;top:2px;width:21px;height:21px;border-radius:50%;background:var(--green);color:#fff;font-size:12px;font-weight:900;display:grid;place-items:center}
.pc-new .ben{font-weight:800;margin:16px 0 2px;color:var(--ink-3);font-size:13.5px;letter-spacing:.05em;text-transform:uppercase}
.call{margin-top:16px;border:2px solid #ffc7a8;background:#fff7f1;color:#d9531a;font-weight:700;font-size:14.5px;text-align:center;border-radius:14px;padding:10px 12px}
.cd{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}
.cd div{background:var(--ink);border-radius:12px;text-align:center;padding:8px 0 6px}
.cd b{display:block;font-size:26px;line-height:1.1;font-variant-numeric:tabular-nums;color:#fff}
.cd span{font-size:10.5px;color:#b9b6d6;text-transform:uppercase;letter-spacing:.06em}
.pc-new .btn{width:100%;margin-top:16px}

/* dòng thời gian */
.tl{display:grid;grid-template-columns:repeat(4,1fr);gap:0;max-width:920px;margin:34px auto 0;position:relative}
.tl::before{content:"";position:absolute;left:12.5%;right:12.5%;top:21px;height:3px;background:linear-gradient(90deg,#0ea5e9,#2563eb 50%,var(--vio));border-radius:3px;opacity:.6}
.tl div{text-align:center;position:relative;padding:0 4px}
.tl i{width:44px;height:44px;margin:0 auto 8px;border-radius:50%;display:grid;place-items:center;font-style:normal;font-size:19px;background:#fff;border:2px solid var(--line);position:relative}
.tl .on i{border-color:#2563eb;box-shadow:0 0 0 6px rgba(37,99,235,.14)}
.tl b{display:block;font-size:15px}
.tl small{display:block;font-size:12.5px;color:var(--ink-2);line-height:1.35}
@media(max-width:560px){.tl b{font-size:13.5px}.tl small{font-size:11.5px}.tl i{width:38px;height:38px;font-size:16px}.tl::before{top:18px}}

/* ===== AI Chat vs AI Agent ===== */
.vs{display:grid;gap:16px;max-width:980px;margin:0 auto}
@media(min-width:860px){.vs{grid-template-columns:.8fr 1.2fr;align-items:stretch}}
.chat{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow)}
.chat h3,.agent h3{font-size:17px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.chat h3 span,.agent h3 span{font-size:12px;font-weight:800;padding:3px 9px;border-radius:8px}
.chat h3 span{background:#f1f0f7;color:var(--ink-2)}
.agent h3 span{background:var(--hot);color:#fff}
.bub{border-radius:16px;padding:10px 13px;font-size:14.5px;margin:8px 0;max-width:92%}
.bub.me{background:var(--vio);color:#fff;margin-left:auto;border-bottom-right-radius:4px}
.bub.ai{background:#f1f0f7;color:var(--ink-2);border-bottom-left-radius:4px}
.chat .end{margin-top:12px;font-size:14px;color:var(--ink-3);text-align:center;border-top:1px dashed var(--line);padding-top:10px}
.agent{background:#fff;border:2px solid #d8cfff;border-radius:22px;padding:18px;box-shadow:var(--shadow-lg)}
.term{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;font-size:13.5px;background:#151335;color:#d9d6f5;border-radius:14px;padding:12px 14px;min-height:300px}
.term .cmd{color:#ffd166}
.term .cmd::before{content:"› ";color:#22d3ee}
.term .ln{display:flex;gap:8px;align-items:flex-start;margin:7px 0;color:#c4c0e8;opacity:0;transform:translateY(6px);transition:all .35s}
.term .ln.show{opacity:1;transform:none}
.term .ln i{font-style:normal;flex:none;width:18px;text-align:center}
.term .ln.ok{color:#3ee6a0;font-weight:700}
.caret{display:inline-block;width:8px;height:1.05em;background:#22d3ee;vertical-align:-2px;margin-left:2px;animation:blink 1s step-end infinite}
@keyframes blink{50%{opacity:0}}
.spin{display:inline-block;animation:spin 1s linear infinite}
.agent .end{margin-top:12px;font-size:14.5px;color:var(--ink);text-align:center;font-weight:700}
.agent .end b{color:var(--green)}

/* ===== học xong làm được gì ===== */
.outs{display:grid;gap:12px}
@media(min-width:700px){.outs{grid-template-columns:1fr 1fr}}
@media(min-width:1000px){.outs{grid-template-columns:repeat(4,1fr)}}
.out{background:#fff;border-radius:18px;padding:18px;border:1px solid var(--line);box-shadow:var(--shadow);display:flex;gap:14px;transition:border-color .2s,transform .2s}
.out:hover{border-color:#c4b6ff;transform:translateY(-3px)}
@media(min-width:1000px){.out{flex-direction:column;gap:10px}}
.oi{width:48px;height:48px;border-radius:14px;background:linear-gradient(135deg,var(--cy-l),var(--vio-l));display:grid;place-items:center;font-size:24px;flex:none}
.out h3{font-size:16.5px;line-height:1.3;margin-bottom:4px}
.out p{color:var(--ink-2);font-size:14.5px}
.need{display:grid;grid-template-columns:auto 1fr;gap:14px 16px;align-items:center;max-width:860px;margin:28px auto 0;background:#fff;border:1px solid var(--line);border-left:6px solid #2563eb;border-radius:20px;padding:20px;box-shadow:var(--shadow)}
.need-ic{width:56px;height:56px;border-radius:16px;background:linear-gradient(135deg,#e0f2fe,#dbe4ff);display:grid;place-items:center;font-size:28px}
.need-tag{font-size:12px;font-weight:800;letter-spacing:.08em;color:#2563eb}
.need h3{font-size:18px;line-height:1.3;margin:2px 0 4px}
.need p{color:var(--ink-2);font-size:15px}
.need-btn{grid-column:1/-1;color:#fff;background:#0068ff;font-size:15px;padding:13px 18px;white-space:normal;text-align:center;box-shadow:0 12px 24px -12px rgba(0,104,255,.7)}
.need-btn .zl{width:22px;height:22px;flex:none}
@media(min-width:760px){.need{grid-template-columns:auto 1fr auto}.need-btn{grid-column:auto}}

/* ===== lộ trình ===== */
.zooms{display:grid;gap:16px}
@media(min-width:860px){.zooms{grid-template-columns:1fr 1fr}}
.zoom{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:var(--shadow)}
.zh{padding:16px 18px;background:linear-gradient(120deg,var(--cy-l),var(--vio-l) 60%,var(--pink-l));border-bottom:1px solid var(--line)}
.zh .d{display:flex;align-items:center;gap:10px;color:#fff;background:var(--hot);padding:10px 14px;border-radius:14px;box-shadow:0 10px 22px -12px rgba(37,99,235,.7)}
.zh .d i{font-style:normal;font-size:26px}
.zh .d small{display:block;font-size:13px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;opacity:.95}
.zh .d b{display:block;font-size:clamp(21px,5.6vw,25px);font-weight:900;line-height:1.2}
.zh h3{font-size:19px;line-height:1.3;margin-top:12px}
.zoom ol{list-style:none;padding:8px 18px 14px;counter-reset:k}
.zoom li{counter-increment:k;display:flex;gap:12px;padding:8px 0;border-bottom:1px dashed var(--line);font-size:15px;color:var(--ink-2)}
.zoom li:last-child{border:0}
.zoom li::before{content:counter(k);flex:none;width:26px;height:26px;border-radius:8px;background:var(--vio-l);color:var(--vio-d);font-weight:900;font-size:13px;display:grid;place-items:center}
.vtitle{text-align:center;margin:34px 0 14px;font-size:20px;font-weight:900}
.vtitle small{display:block;font-size:14.5px;color:var(--ink-2);font-weight:500}
.chaps{max-width:860px;margin:0 auto;display:grid;gap:10px}
.chap{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 8px 20px -16px rgba(70,50,170,.4)}
.chap summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:14px;padding:13px 16px}
.chap summary::-webkit-details-marker{display:none}
.cno{width:44px;height:40px;border-radius:12px;flex:none;display:grid;place-items:center;font-weight:900;font-size:16px;color:var(--vio-d);background:var(--vio-l)}
.chap summary b{flex:1;font-size:16px;line-height:1.35}
.cnt{flex:none;font-size:13px;font-weight:800;color:var(--green);background:var(--green-l);border:1px solid #b8ebd3;padding:3px 10px;border-radius:99px;white-space:nowrap}
.chap ul{list-style:none;padding:0 16px 12px 74px}
.chap li{font-size:14.5px;color:var(--ink-2);padding:5px 0;border-top:1px dashed var(--line)}
@media(max-width:480px){.chap summary{padding:12px;gap:10px}.cno{width:38px;height:36px;font-size:14px}.chap summary b{font-size:14.5px}.cnt{font-size:11.5px;padding:3px 8px}.chap ul{padding-left:16px}}

/* ===== chốt ===== */
.final{text-align:center;border-radius:30px;padding:3px;background:var(--grad);box-shadow:var(--shadow-lg)}
.final-in{background:radial-gradient(600px 300px at 50% 0%,#f1ecff,transparent 70%),#fff;border-radius:27px;padding:36px 18px}
.final .h2{max-width:700px;margin-left:auto;margin-right:auto}
.final .fp{display:flex;justify-content:center;align-items:baseline;gap:12px;flex-wrap:wrap;margin:10px 0}
.final .fp b{font-size:clamp(40px,11vw,58px);font-weight:900;color:var(--red);line-height:1}
.final .fp s{color:var(--ink-3);font-size:20px;font-weight:700}
.final .cd{max-width:420px;margin:12px auto 0}
.final .cta2{max-width:600px;margin-left:auto;margin-right:auto}
.final .eyebrow{font-style:normal}

/* ===== hỏi đáp ===== */
.faq{max-width:820px;margin:0 auto;display:grid;gap:10px}
.faq details{background:#fff;border-radius:16px;border:1px solid var(--line);overflow:hidden;box-shadow:0 8px 20px -16px rgba(70,50,170,.4)}
.faq summary{list-style:none;cursor:pointer;padding:16px 50px 16px 18px;font-weight:700;position:relative;font-size:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:8px;background:var(--vio-l);color:var(--vio-d);display:grid;place-items:center;font-size:18px;font-weight:800}
.faq details[open] summary::after{content:"-"}
.faq details p{padding:0 18px 16px;color:var(--ink-2)}
.faq a{color:#0068ff;font-weight:700}

footer{padding:24px 0 120px;text-align:center;color:var(--ink-3);font-size:14px}
@media(min-width:860px){footer{padding-bottom:40px}}

/* ===== thanh dưới điện thoại ===== */
.mbar{position:fixed;left:0;right:0;bottom:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--line);box-shadow:0 -10px 30px -20px rgba(70,50,170,.5);padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:12px;transform:translateY(110%);transition:transform .3s}
.mbar.show{transform:none}
.mbar .mp{flex:1;min-width:0;line-height:1.2}
.mbar .mp b{font-size:21px;color:var(--red);font-weight:900;display:block}
.mbar .mp b s{font-size:13px;color:var(--ink-3);font-weight:600;margin-left:4px}
.mbar .mp small{font-size:12px;color:var(--ink-2);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.mbar .btn{padding:13px 18px;font-size:15px;flex:none}
@media(min-width:860px){.mbar{display:none}}

/* ===== popup ===== */
.modal{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:16px}
.modal-bg{position:absolute;inset:0;background:rgba(27,24,64,.55);backdrop-filter:blur(4px);animation:fade .2s}
.modal-box{position:relative;background:#fff;border-radius:24px;width:100%;max-width:440px;padding:24px 20px 18px;box-shadow:var(--shadow-lg);animation:pop .25s ease-out;max-height:calc(100vh - 32px);overflow:auto}
@keyframes fade{from{opacity:0}}
@keyframes pop{from{opacity:0;transform:translateY(20px) scale(.97)}}
.mx{position:absolute;right:12px;top:10px;width:34px;height:34px;border-radius:10px;border:0;background:var(--vio-l);color:var(--vio-d);font-size:22px;cursor:pointer;font-family:inherit}
.m-head{text-align:center;margin:4px 26px 14px}
.m-head .m-tag{display:inline-block;font-size:12.5px;font-weight:900;color:#fff;background:var(--hot);padding:4px 10px;border-radius:8px}
.m-head h3{font-size:21px;margin:8px 0 2px;line-height:1.3}
.m-head p b{color:var(--red);font-size:26px;font-weight:900}
.m-head p s{color:var(--ink-3);font-size:15px;margin-left:6px}
.modal-box label{display:block;font-weight:700;font-size:14px;margin-bottom:12px;color:var(--ink-2)}
.modal-box input{display:block;width:100%;margin-top:5px;font-family:inherit;font-size:16px;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fbfaff;color:var(--ink)}
.modal-box input:focus{outline:none;border-color:var(--vio);box-shadow:0 0 0 4px rgba(109,76,255,.15)}
.ferr{color:#c62828;font-size:14px;font-weight:600;min-height:4px;margin-bottom:8px}
.fnote{text-align:center;font-size:12.5px;color:var(--ink-3);margin-top:10px}
@media(max-width:400px){.m-head{margin:4px 0 12px}.mx{top:6px;right:6px}}

/* ===== trạng thái ===== */
body.ended .live-only{display:none!important}
body:not(.ended) .end-only{display:none!important}
.endbox{background:#fff;border:2px dashed #c7d7fe;border-radius:18px;padding:16px;margin-top:18px}
.endbox b{color:var(--red)}

/* nút đăng ký: nhịp đập nhẹ + vòng sáng */
.btn-main{animation:breathe 2.2s ease-in-out infinite}
@keyframes breathe{0%,100%{transform:scale(1);box-shadow:0 14px 30px -12px rgba(37,99,235,.7),0 0 0 0 rgba(37,99,235,.45)}50%{transform:scale(1.035);box-shadow:0 18px 36px -12px rgba(37,99,235,.8),0 0 0 10px rgba(37,99,235,0)}}
.btn-main:hover{animation-play-state:paused}

/* chữ nút đăng ký to hơn */
.btn-main{font-size:19px;padding:18px 26px}
.mbar .btn-main{font-size:16px;padding:13px 18px}
.need-btn{font-size:15px}

/* =====================================================================
   BẢN NỀN TỐI (23/10, thầy cho thử lại giống bản đầu)
   Muốn quay về nền sáng: xóa từ dòng này tới hết file (bản sáng đủ ở style-ban-sang.css)
   ===================================================================== */
:root{
  --bg:#060a1c; --card:rgba(14,20,52,.94); --soft:rgba(255,255,255,.06); --line:rgba(255,255,255,.12);
  --vio-l:rgba(124,92,255,.2); --vio-d:#b3a2ff; --cy-l:rgba(34,211,238,.12); --pink-l:rgba(255,79,163,.12);
  --green:#2ee59d; --green-l:rgba(46,229,157,.12); --red:#ffcf4a;
  --ink:#eef1ff; --ink-2:#b7bedc; --ink-3:#7d86ad;
  --shadow:0 24px 60px -24px rgba(0,0,0,.75); --shadow-lg:0 30px 80px -24px rgba(37,99,235,.55);
}
body{background:var(--bg)}
.scene{background:radial-gradient(900px 600px at 85% -5%,rgba(37,99,235,.38),transparent 60%),radial-gradient(800px 600px at -10% 30%,rgba(34,211,238,.18),transparent 60%),radial-gradient(700px 500px at 60% 110%,rgba(124,92,255,.22),transparent 60%),var(--bg)}
.scene::before,.scene::after{display:none}
.grid-bg{inset:-50% -10% 0;background-image:linear-gradient(rgba(96,140,255,.13) 1px,transparent 1px),linear-gradient(90deg,rgba(96,140,255,.13) 1px,transparent 1px);background-size:46px 46px;
  -webkit-mask-image:radial-gradient(ellipse 70% 55% at 50% 30%,#000 30%,transparent 75%);mask-image:radial-gradient(ellipse 70% 55% at 50% 30%,#000 30%,transparent 75%);animation:gridmove 18s linear infinite}
#stars{display:block}
@keyframes twd{50%{opacity:.1}}

.top{background:rgba(6,10,28,.75);border-bottom-color:var(--line)}
.meta span,.app,.tag-ai,.chat,.out,.zoom,.chap,.faq details,.tl i{background:var(--card);border-color:var(--line)}
.app{background:#11183d}
.tag-ai{background:rgba(11,17,48,.92)}
.tl i{background:#121a45}
.hprice{background:linear-gradient(180deg,#121a45,#0b1130);border-color:rgba(96,140,255,.45)}
.pc-old{background:var(--card);border-color:var(--line)}
.pc-in{background:linear-gradient(180deg,#121a45,#0b1130)}
.here{background:#fff;color:#0b1130}.here::after{border-top-color:#fff}
.cd div{background:#05081a;border:1px solid var(--line)}
.call{background:rgba(255,207,74,.08);border-color:rgba(255,207,74,.45);color:#ffd97a}
.save{border-color:rgba(46,229,157,.35)}
.cnt{border-color:rgba(46,229,157,.3)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border-color:rgba(255,255,255,.25)}
.btn-ghost:hover{border-color:#60a5fa}
.orbit::before{border-color:rgba(147,180,255,.35)}
.orbit::after{border-color:rgba(34,211,238,.2);background:none}
.core{box-shadow:0 0 70px -6px rgba(37,99,235,.8),0 0 120px -20px rgba(34,211,238,.6)}
.core img{border-color:var(--bg)}
.chat h3 span,.bub.ai{background:rgba(255,255,255,.08)}
.agent{background:linear-gradient(180deg,#0d1438,#080d26);border-color:rgba(96,140,255,.5)}
.term{background:#04071a;border:1px solid var(--line)}
.oi,.need-ic{background:linear-gradient(135deg,rgba(34,211,238,.18),rgba(37,99,235,.28));border:1px solid var(--line)}
.out:hover{border-color:rgba(96,140,255,.6)}
.need{background:var(--card);border-color:var(--line);border-left-color:#3b82f6}
.need-tag{color:#60a5fa}
.zh{background:linear-gradient(120deg,rgba(34,211,238,.16),rgba(37,99,235,.28));border-bottom-color:var(--line)}
.final-in{background:radial-gradient(600px 300px at 50% 0%,rgba(37,99,235,.35),transparent 70%),#0a0f2c}
.eyebrow{background:rgba(255,255,255,.06);border-color:rgba(96,140,255,.45);color:#93c5fd}
.faq a,.need a{color:#60a5fa}
.mbar{background:rgba(8,12,34,.95);border-top-color:var(--line)}
.modal-bg{background:rgba(2,4,14,.7)}
.modal-box{background:linear-gradient(180deg,#131b48,#0b1130);border:1px solid rgba(96,140,255,.45)}
.modal-box input{background:rgba(255,255,255,.06);border-color:var(--line);color:var(--ink)}
.modal-box input::placeholder{color:#5f6890}
.mx{background:rgba(255,255,255,.08);color:var(--ink)}
.ferr{color:#ff8a9a}
.endbox{background:var(--card);border-color:rgba(96,140,255,.45)}

/* trang thanh toán */
body .box{background:linear-gradient(180deg,#111842,#0b1130);border-color:var(--line)}
body .steps3 .s i{background:rgba(255,255,255,.08)}
body .steps3 .ln{background:rgba(255,255,255,.1)}
body .steps3 .s.on{color:#60a5fa}
body .hi p .zl{color:#60a5fa}
body .mini-cd{background:rgba(255,207,74,.08);border-color:rgba(255,207,74,.45);color:#ffd97a}
body .mini-cd b{color:#fff}
body .qrbox{border-color:rgba(96,140,255,.5);background:rgba(255,255,255,.03)}
body .bank div{border-bottom-color:var(--line)}
body .copy{background:transparent;border-color:rgba(96,140,255,.5);color:#93c5fd}
body .warn{background:rgba(255,207,74,.08);border-color:rgba(255,207,74,.35)}
body .nodata{background:var(--card);border-color:rgba(96,140,255,.45)}
body .nodata a{color:var(--gold)}
body .claude-need{background:rgba(255,77,109,.1);border-color:rgba(255,120,140,.55)}
body .claude-need a{color:#60a5fa}
.need a.need-btn{color:#fff}

/* ===== bầu trời đêm (23/10) ===== */
.scene{background:
  radial-gradient(1200px 500px at 50% 115%,rgba(76,64,170,.22),transparent 70%),
  radial-gradient(700px 420px at 85% -5%,rgba(37,99,235,.13),transparent 65%),
  linear-gradient(180deg,#010208 0%,#03061a 40%,#070b26 75%,#0d1038 100%)}
.grid-bg{display:none}
/* dải ngân hà mờ chéo trời */
.scene::before{display:block;content:"";position:absolute;left:-30%;top:18%;width:160%;height:260px;border-radius:50%;
  background:radial-gradient(ellipse at center,rgba(170,185,255,.07) 0%,rgba(140,120,255,.035) 40%,transparent 70%);transform:rotate(-24deg);filter:blur(24px)}
.scene::after{display:block;content:"";position:absolute;width:520px;height:520px;right:-180px;bottom:8%;border-radius:50%;background:rgba(124,92,255,.06);filter:blur(80px)}
.star{position:absolute;border-radius:50%;opacity:var(--o,.6);animation:twinkle 4s ease-in-out infinite}
.star.big{box-shadow:0 0 6px 1px rgba(190,210,255,.8)}
@keyframes twinkle{0%,100%{opacity:var(--o,.6)}50%{opacity:.08}}
/* sao băng */
.meteor{position:absolute;width:var(--len,160px);height:2px;border-radius:2px;transform-origin:right center;
  background:linear-gradient(90deg,rgba(255,255,255,0),rgba(200,220,255,.55) 60%,#fff);
  filter:drop-shadow(0 0 6px rgba(160,200,255,.9));opacity:0;animation:meteor 1.2s ease-out forwards}
.meteor::after{content:"";position:absolute;right:-2px;top:50%;width:5px;height:5px;margin-top:-2.5px;border-radius:50%;background:#fff;box-shadow:0 0 10px 3px rgba(190,215,255,.95)}
@keyframes meteor{
  0%{opacity:0;transform:rotate(var(--a)) translateX(0)}
  12%{opacity:1}
  70%{opacity:1}
  100%{opacity:0;transform:rotate(var(--a)) translateX(420px)}}
@media (prefers-reduced-motion:reduce){.meteor{display:none}}

/* ô nội dung gần như đặc để chữ dễ đọc trên nền sao */
.btn-ghost{background:#111a42}
.eyebrow{background:rgba(14,20,52,.94)}
.zh{background:linear-gradient(120deg,#0f2a4a,#14204f)}
.kicker{background:rgba(14,20,52,.9)}

/* dấu x đỏ / tích xanh cạnh AI Chat, AI Agent */
.mk{font-style:normal;width:28px;height:28px;border-radius:50%;display:inline-grid;place-items:center;font-size:16px;font-weight:900;color:#fff;flex:none}
.mk.no{background:#ef4444;box-shadow:0 0 0 4px rgba(239,68,68,.2)}
.mk.ok{background:#22c55e;box-shadow:0 0 0 4px rgba(34,197,94,.22)}