/* Trang thử hệ nút CTA KHA V2 (12/10/2026). Phần chung: token A2 hồng, khung trang giả, công tắc người xem, nút đang chạy để so. */
:root{
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --hand:"Dancing Script","Be Vietnam Pro",cursive;
  --hong-50:#fff2f7;--hong-100:#ffdeea;--hong-200:#ffbcd7;--hong-300:#ff98c5;--hong-400:#ff489e;--hong-500:#f41e92;--hong-600:#ce1e78;--hong-700:#9d0f5b;--hong-800:#660a3b;--hong-900:#3a0621;
  --than-0:#17070f;--than:#1d0812;--than-2:#250a16;--than-3:#2c0d1b;
  --cam:#fa9524;--cam-dam:#ec7c0e;--vang:#fdd343;--cta-a:#ffa448;--cta-b:#ec7c0e;--cta-chu:#1e0e15;
  --chu:#16090f;--chu-2:#4d3a43;--chu-3:#85707a;--chu-toi:#fff;--chu-toi-2:#efd6e1;
  --vien:#f5d6e3;--vien-toi:rgba(255,72,158,.28);--xanh:#16a34a;--xanh-toi:#4ade80;
  --nut-cam:linear-gradient(180deg,#ffb15c 0%,#f8902a 52%,#e5730f 100%);
  --hat:url("img/hat-nhieu.png");
  --than-nen:linear-gradient(170deg in oklch,var(--than-3),var(--than) 55%,var(--than-0));
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--chu);background:#fff8fb;-webkit-font-smoothing:antialiased;line-height:1.55}
img{max-width:100%;display:block}
button{font:inherit}
.wrap{width:min(100% - 48px,1200px);margin-inline:auto}
@media (max-width:600px){.wrap{width:calc(100% - 32px)}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ===== thanh điều khiển của trang thử (không thuộc thiết kế) ===== */
.dk{position:sticky;top:0;z-index:50;background:#111;color:#eee;font-size:13px;border-bottom:1px solid #333}
.dk .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding:9px 0}
.dk a{color:#ffb3d6;text-decoration:none;font-weight:600}
.dk-ten{font-weight:800;color:#fff}
.dk-nhom{display:inline-flex;align-items:center;gap:6px}
.dk-nhom>span{color:#aaa}
.dk-cong{display:inline-flex;background:#222;border:1px solid #3a3a3a;border-radius:999px;padding:3px}
.dk-cong button{border:0;background:transparent;color:#ccc;padding:6px 12px;border-radius:999px;cursor:pointer;font-weight:600;font-size:13px;line-height:1}
.dk-cong button[aria-pressed=true]{background:#fff;color:#111}
.dk-cong button:focus-visible{outline:2px solid #ffb3d6;outline-offset:2px}
.dk-cong[aria-disabled=true]{opacity:.35;pointer-events:none}
.dk-gl{color:#999;font-size:12px}
@media (max-width:600px){.dk{font-size:12px}.dk .wrap{gap:8px 12px}.dk-cong button{padding:6px 9px;font-size:12px}.dk-gl{display:none}}

/* ===== khung trang giả ===== */
.toi{background:var(--hat),radial-gradient(60% 55% at 80% 10%,rgba(244,30,146,.24),transparent 70%),radial-gradient(55% 50% at 5% 100%,rgba(157,15,91,.30),transparent 70%),var(--than-nen);color:#fff}
.sang{background:radial-gradient(48% 60% at 100% 0%,rgba(244,30,146,.10),transparent 70%),linear-gradient(180deg in oklch,var(--hong-50),#fff8fb)}
.gh{position:relative;z-index:5;border-bottom:1px solid rgba(255,72,158,.18)}
.gh .wrap{display:flex;align-items:center;gap:28px;min-height:72px}
.gh-logo img{height:34px;width:auto}
.gh-nav{display:flex;gap:22px;font-size:14.5px;font-weight:600;color:var(--chu-toi-2);margin-right:auto}
.gh-nav span{white-space:nowrap}
@media (max-width:1023px){.gh-nav{display:none}.gh .wrap{justify-content:space-between}}
@media (max-width:600px){.gh-logo img{height:26px}.gh .wrap{min-height:60px;gap:10px}}
.kh{padding:clamp(56px,7vw,96px) 0;position:relative;overflow-x:clip}
.kh-eb{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-weight:700;font-size:13px;line-height:1;background:rgba(255,72,158,.14);color:#fff;box-shadow:0 0 0 1px rgba(255,72,158,.3) inset}
.sang .kh-eb{background:var(--hong-100);color:var(--hong-700);box-shadow:none}
.kh h1{font-size:clamp(34px,4.6vw,60px);line-height:1.15;font-weight:800;margin:18px 0 14px;letter-spacing:-.01em;max-width:15em;text-wrap:balance}
.kh h2{font-size:clamp(26px,3.2vw,42px);line-height:1.22;font-weight:800;margin:14px 0 12px;max-width:20em;text-wrap:balance}
@media (max-width:1023px){.kh h1,.kh h2{text-wrap:pretty}}
.kh h1 em,.kh h2 em{font-style:normal;background:linear-gradient(90deg in oklch,var(--hong-400),var(--hong-300));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sang h2 em{background:linear-gradient(90deg in oklch,var(--hong-600),var(--hong-500));-webkit-background-clip:text;background-clip:text}
.kh-lead{font-size:clamp(16px,1.3vw,18px);color:var(--chu-toi-2);max-width:40em;margin:0 0 30px}
.sang .kh-lead{color:var(--chu-2)}
.kh.giua-c{text-align:center}.kh.giua-c h2,.kh.giua-c .kh-lead{margin-inline:auto}
.o-nut{position:relative}
.ghi{margin-top:18px;font-size:12px;color:var(--chu-3)}
.toi .ghi{color:rgba(239,214,225,.6)}

/* ===== bảng trạng thái tương tác ===== */
.ep{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,430px),1fr));gap:14px;margin-top:26px}
.ep-o{overflow:clip;overflow-clip-margin:8px;border-radius:16px;padding:22px 18px 18px;display:flex;flex-direction:column;gap:14px;align-items:flex-start;min-height:150px}
.ep-o.toi{border:1px solid rgba(255,72,158,.22)}
.ep-o.sang{border:1px solid var(--vien);background:#fff}
.ep-nhan{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--chu-3)}
.ep-o.toi .ep-nhan{color:rgba(239,214,225,.7)}

/* ===== so với nút đang chạy ===== */
.so{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:26px}
@media (max-width:900px){.so{grid-template-columns:1fr}}
.so-o{border-radius:18px;padding:26px 22px;display:flex;flex-direction:column;gap:16px}
.so-o h3{margin:0;font-size:15px;font-weight:800}
.so-o p.chu{margin:0;font-size:14px;color:var(--chu-toi-2)}
/* nút đang chạy (chép từ kha.css 12/10, chỉ để đặt cạnh so) */
.cu{display:inline-flex;flex-direction:column;align-items:flex-start;gap:10px;max-width:100%}
.cu-btn{position:relative;isolation:isolate;overflow:hidden;display:inline-flex;align-items:center;gap:16px;min-height:62px;padding:10px 12px 10px 28px;border-radius:999px;text-decoration:none;color:var(--cta-chu);background:linear-gradient(180deg,#ffa448 0%,#f08a24 55%,#e2700f 100%);box-shadow:0 1px 0 rgba(255,255,255,.45) inset,0 -2px 0 rgba(0,0,0,.08) inset,0 14px 30px rgba(240,138,36,.38),0 3px 8px rgba(200,90,10,.25)}
.cu-btn .t{display:flex;flex-direction:column;gap:3px;line-height:1.15}
.cu-btn .t b{font:800 17.5px/1.15 var(--font)}
.cu-btn .t small{font:600 13px/1.2 var(--font);color:rgba(30,14,21,.82)}
.cu-btn .mui{flex:none;display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,.3);box-shadow:0 0 0 1px rgba(255,255,255,.45) inset}
.cu-btn .mui svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.cu-dam{display:inline-flex;align-items:center;gap:8px;margin:0;font:500 14px/1.3 var(--font);color:var(--chu-toi-2)}
.cu-dam svg{flex:none;width:18px;height:18px;fill:none;stroke:var(--xanh-toi);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
@media (max-width:600px){.cu,.cu-btn{width:100%}.cu-btn{justify-content:space-between}}

/* ===== mảnh dùng chung ===== */
.ic{width:20px;height:20px;flex:none;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;display:block}
.xoay{width:18px;height:18px;border-radius:50%;border:2.5px solid currentColor;border-right-color:transparent;animation:xoay .7s linear infinite;flex:none;display:none}
@keyframes xoay{to{transform:rotate(360deg)}}
.dang-tai .xoay{display:block}
.dang-tai{cursor:progress}
.dam{display:inline-flex;align-items:center;gap:8px;margin:0;font:500 14px/1.3 var(--font);color:var(--chu-2)}
.dam .ic{width:18px;height:18px;stroke:var(--xanh)}
.dam b{font-weight:700;color:var(--chu)}
.toi .dam{color:var(--chu-toi-2)}.toi .dam b{color:#fff}.toi .dam .ic{stroke:var(--xanh-toi)}
@media (prefers-reduced-motion:reduce){*{animation-duration:.001s!important;animation-iteration-count:1!important;transition:none!important}.xoay{animation:none;border-right-color:currentColor;opacity:.6}}

/* thumbnail bài thật: phút đè góc, nút phát hoặc ổ khoá, vạch đã xem */
.th{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;background:var(--than-2);flex:none}
.th img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.th em{position:absolute;right:5px;bottom:6px;padding:2px 5px;border-radius:4px;background:rgba(10,3,7,.82);color:#fff;font:700 10.5px/1.2 var(--font);font-style:normal;font-variant-numeric:tabular-nums}
.th-play,.th-khoa{position:absolute;left:50%;top:50%;width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.92);color:var(--than)}
.th-play svg{width:14px;height:14px;margin-left:2px}
.th-khoa{background:rgba(29,8,18,.78);color:#fff}.th-khoa .ic{width:15px;height:15px}
.th-vach{position:absolute;left:0;right:0;bottom:0;height:4px;background:rgba(255,255,255,.35)}
.th-vach::after{content:"";position:absolute;inset:0 auto 0 0;width:var(--x);background:var(--hong-500)}
.tag-pro{height:24px;width:auto;flex:none}