/* Intertu - Economics v7
   Màu brand Intertu: xanh #2C4F33 là màu chính (nền tối dùng gradient quanh màu này),
   hồng #E35472 / #FFC9D4 là màu phụ (nút, chữ nhấn, số thứ tự). Nút dùng #C2385A để chữ trắng đạt 4,5:1.
   Bố cục, font và hình khối tham khảo fundaacps.org; hero là quả cầu ảnh xoay (tham khảo westbournegrammar.com). */
:root{
  --brand:#2c4f33; --brand-hi:#3d6a47; --deep:#1e3524; --ink:#1e2a21; --ink-2:#4f5a52;
  --grad:linear-gradient(140deg,#335a3b 0%,#2c4f33 45%,#203a26 100%);
  --pink:#e35472; --pink-lt:#ffc9d4; --hl-light:#c2385a;
  --paper:#f4f3ef; --sand:#ffffff; --line:#e0ddd5; --white:#fff;
  --cta:#c2385a; --cta-hi:#a52d4b; --cta-lo:#8a2641;
  --up:#c2385a;
  --r:12px;
  --m:clamp(16px,4.4vw,64px);
  --hdr:72px;
  --serif:"IBM Plex Serif",Georgia,"Times New Roman",serif;
  --sans:Inter,"Segoe UI",system-ui,sans-serif;
  --ease:cubic-bezier(.2,.7,.2,1);
  --ease-io:cubic-bezier(.65,0,.35,1);
  --s-h1:clamp(40px,5.6vw,80px);
  --s-h2:clamp(32px,3.8vw,56px);
  --s-h3:clamp(18px,1.5vw,22px);
  --s-lead:clamp(17px,1.3vw,19px);
  --s-body:clamp(15px,1.1vw,16px);
  --s-small:14px;
  --pad:clamp(40px,7svh,88px);
  interpolate-size:allow-keywords;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--hdr)}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:var(--s-body);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
.ch-ink :focus-visible,.hero :focus-visible,.ftr :focus-visible{outline-color:var(--pink-lt)}
.skip{position:absolute;left:-999px;top:8px;background:var(--brand);color:#fff;padding:12px 16px;z-index:100}
.skip:focus{left:8px}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
[hidden]{display:none!important}

/* tiêu đề kiểu fundaacps: serif nét vừa, phần <em> đổi màu chứ không nghiêng */
h1,h2{font-family:var(--serif);font-weight:500;line-height:1.08;letter-spacing:-.01em;text-wrap:balance}
h2{font-size:var(--s-h2);max-width:18ch}
h1 em,h2 em{font-style:normal;color:var(--hl,var(--hl-light))}
h3{font-family:var(--sans);font-weight:700;font-size:var(--s-h3);line-height:1.25;letter-spacing:-.01em}
.lead{font-size:var(--s-lead);line-height:1.55;max-width:48ch;color:var(--fg2,inherit)}

.wrap{position:relative;z-index:1;max-width:1440px;margin-inline:auto;padding-inline:var(--m)}
.chapter{position:relative;overflow:hidden;padding-block:var(--pad);background-color:var(--bg);color:var(--fg)}
.ch-paper{--bg:var(--paper);--fg:var(--ink);--fg2:var(--ink-2)}
.ch-sand{--bg:var(--sand);--fg:var(--ink);--fg2:var(--ink-2)}
.ch-ink{--bg:var(--brand);--fg:#fff;--fg2:#d3dfd3;--hl:var(--pink-lt);background-image:var(--grad)}

/* ---------- nền động ---------- */
.amb{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.amb i{position:absolute;display:block;animation-play-state:paused}
.amb-on .amb i{animation-play-state:running}
.amb-light{inset:-20%;background:radial-gradient(40% 45% at 78% 22%,rgba(111,160,118,.32),transparent 70%),radial-gradient(38% 40% at 22% 78%,rgba(255,201,212,.1),transparent 70%);animation:light-sweep 9s ease-in-out infinite alternate}
.amb-grid{inset:-72px;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:72px 72px;-webkit-mask-image:linear-gradient(100deg,#000 0%,rgba(0,0,0,.5) 55%,transparent 90%);mask-image:linear-gradient(100deg,#000 0%,rgba(0,0,0,.5) 55%,transparent 90%);animation:grid-travel 12s linear infinite}
.amb-orbit{width:min(70vw,760px);aspect-ratio:1;right:-14%;top:-30%;border:1px solid rgba(255,201,212,.16);border-radius:50%;animation:orbit-drift 11s ease-in-out infinite alternate}
.amb-orbit.o2{width:min(46vw,480px);right:auto;left:-12%;top:auto;bottom:-34%;border-color:rgba(111,160,118,.3);animation-duration:14s;animation-delay:-5s}
.amb-band{left:-15%;width:130%;height:62%;top:42%;border-radius:50%;border-top:1px solid rgba(255,201,212,.18);box-shadow:0 -10px 28px rgba(255,201,212,.05);animation:ribbon-sweep 8s ease-in-out infinite alternate}
.amb-band.b2{top:58%;border-top-color:rgba(111,160,118,.32);box-shadow:0 -10px 28px rgba(111,160,118,.08);animation-duration:10s;animation-delay:-4s}
.amb-halo{width:46%;height:70%;left:30%;top:10%;background:radial-gradient(closest-side,rgba(111,160,118,.2),transparent);filter:blur(30px);animation:halo-sweep 7s ease-in-out infinite alternate}
.ch-paper .amb-light,.ch-sand .amb-light{background:radial-gradient(40% 45% at 80% 15%,rgba(44,79,51,.06),transparent 70%),radial-gradient(38% 40% at 15% 85%,rgba(255,201,212,.18),transparent 70%)}
.ch-paper .amb-grid,.ch-sand .amb-grid{background-image:linear-gradient(rgba(30,42,33,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(30,42,33,.045) 1px,transparent 1px)}
.ch-paper .amb-orbit,.ch-sand .amb-orbit{border-color:rgba(44,79,51,.12)}
.ch-paper .amb-band,.ch-sand .amb-band{border-top-color:rgba(194,56,90,.16);box-shadow:none}
.ch-paper .amb-halo,.ch-sand .amb-halo{display:none}
@keyframes light-sweep{from{translate:-4% -3%;scale:1;opacity:.75}to{translate:6% 5%;scale:1.15;opacity:1}}
@keyframes grid-travel{to{translate:72px 72px}}
@keyframes orbit-drift{from{translate:-24px -24px;scale:.94}to{translate:24px 34px;scale:1.08}}
@keyframes ribbon-sweep{from{translate:4% -40px;rotate:-7deg;opacity:.55}to{translate:-6% 50px;rotate:8deg;opacity:1}}
@keyframes halo-sweep{from{translate:-12% 8%;scale:.9;opacity:.6}to{translate:12% -9%;scale:1.2;opacity:1}}

/* ---------- nút và liên kết: dạng viên thuốc như fundaacps ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:54px;padding:14px 28px;background:var(--cta);color:#fff;border:2px solid var(--cta);border-radius:999px;font-weight:700;font-size:16px;line-height:1.2;transition:background-color .2s var(--ease-io),border-color .2s var(--ease-io),color .2s var(--ease-io)}
.btn svg{width:20px;height:20px;flex:none;transition:transform .25s var(--ease-io)}
.btn:hover{background:var(--cta-hi);border-color:var(--cta-hi)}
.btn:hover svg{transform:translateX(4px)}
.btn:active{background:var(--cta-lo);border-color:var(--cta-lo)}
.btn:disabled{background:transparent;border-color:currentColor;color:inherit;opacity:.45;cursor:not-allowed}
.btn-sm{min-height:46px;padding:10px 22px}
/* nút phụ: viên trắng có vòng tròn đỏ cam chứa biểu tượng */
.btn-ghost{display:inline-flex;align-items:center;gap:12px;min-height:54px;padding:6px 24px 6px 6px;background:#fff;color:var(--ink);border:0;border-radius:999px;font-weight:700;font-size:15px;transition:background-color .2s var(--ease-io)}
.btn-ghost .ic{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--cta);color:#fff;transition:transform .3s var(--ease)}
.btn-ghost .ic svg{width:16px;height:16px;margin-left:2px}
.btn-ghost:hover{background:var(--paper)}
.btn-ghost:hover .ic{transform:scale(1.08)}
.more{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-weight:700;font-size:var(--s-small);background:none;border:0;padding:0;color:inherit;text-decoration:underline;text-decoration-color:transparent;text-decoration-thickness:2px;text-underline-offset:6px;transition:text-decoration-color .2s var(--ease-io)}
.more svg{width:18px;height:18px;transition:transform .25s var(--ease-io)}
.more:hover{text-decoration-color:currentColor}
.more:hover svg{transform:translateX(5px)}

/* ---------- header ---------- */
.hdr{position:sticky;top:0;z-index:50;height:var(--hdr);background:var(--hb,#fff);color:var(--hf,var(--ink));border-bottom:1px solid var(--hl,var(--line));transition:background .35s var(--ease-io),color .35s var(--ease-io),border-color .35s,transform .45s var(--ease-io)}
.hdr.is-ink{--hb:var(--brand);--hf:#fff;--hl:rgba(255,255,255,.1)}
.hdr.is-sand{--hb:#fff;--hf:var(--ink)}
.hdr.is-hidden{transform:translateY(-100%)}
.hdr-in{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{width:96px;height:auto;transition:filter .35s}
.hdr.is-ink .logo{filter:brightness(0) invert(1)}
.nav{display:none;gap:clamp(18px,2.4vw,36px);font-weight:600;font-size:15px}
.nav a{padding:10px 0;text-decoration:underline;text-decoration-color:transparent;text-decoration-thickness:2px;text-underline-offset:8px;transition:text-decoration-color .2s var(--ease-io)}
.nav a:hover,.nav a.on{text-decoration-color:var(--cta)}
.hdr.is-ink .nav a:hover,.hdr.is-ink .nav a.on{text-decoration-color:var(--pink-lt)}
.hdr-act{display:flex;align-items:center;gap:12px}
.icon-btn{display:inline-grid;place-items:center;width:46px;height:46px;border:1px solid currentColor;border-radius:50%;transition:background .2s,color .2s}
.icon-btn:hover{background:var(--hf,var(--ink));color:var(--hb,#fff)}
.icon-btn svg{width:20px;height:20px}
.progress{position:fixed;left:0;top:0;height:3px;width:100%;transform-origin:0 50%;transform:scaleX(var(--sp,0));background:var(--cta);z-index:60;pointer-events:none}
@media(min-width:960px){.nav{display:flex}}

/* ---------- khung video dùng chung ---------- */
.vframe{display:flex;flex-direction:column;padding:8px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);border-radius:var(--r);box-shadow:0 30px 60px -30px rgba(10,20,12,.7);color:#fff;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.vbar{display:flex;align-items:center;gap:10px;min-height:36px;padding:0 4px 8px;font-size:13px;font-weight:600;letter-spacing:.01em;white-space:nowrap;overflow:hidden}
.vdot{width:8px;height:8px;border-radius:50%;background:var(--cta);box-shadow:0 0 0 4px rgba(194,56,90,.28);flex:none}
.vcap{min-width:0;overflow:hidden;text-overflow:ellipsis}
.vtime{flex:none;margin-left:auto;display:inline-flex;align-items:center;gap:6px;padding:4px 10px 4px 8px;border-radius:999px;background:rgba(255,255,255,.14);font-weight:700}
.vtime svg{width:14px;height:14px}
.vbox{position:relative;display:block;overflow:hidden;background:#000;flex:1;min-height:0;border-radius:calc(var(--r) - 4px)}
.vbox video,.vbox img{width:100%;height:100%;object-fit:cover}
.vplay{position:absolute;left:50%;top:50%;display:grid;place-items:center;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;background:var(--cta);color:#fff;transition:transform .3s var(--ease)}
.vplay svg{width:24px;height:24px;margin-left:3px}

/* ---------- hero: quả cầu ảnh xoay (tham khảo westbournegrammar.com), tiêu đề trái, video phải ---------- */
.hero{position:relative;overflow:hidden;background:var(--brand);background-image:var(--grad);color:#fff;--hl:var(--pink-lt);height:calc(100svh - var(--hdr));min-height:560px;max-height:960px}
/* quả cầu: các ô ảnh/thẻ chữ đặt trên mặt cầu bằng CSS 3D, cả khối xoay chậm quanh trục đứng */
.globe{position:absolute;inset:0;z-index:0;perspective:1100px;perspective-origin:54% 50%;pointer-events:none;overflow:hidden}
.globe-tilt{position:absolute;left:54%;top:52%;width:0;height:0;transform-style:preserve-3d;transform:rotateX(calc(-8deg + var(--gy,0) * 6deg)) rotateY(calc(var(--gx,0) * 8deg));transition:transform 1.2s var(--ease)}
.globe-rot{position:absolute;transform-style:preserve-3d;animation:globe-spin 90s linear infinite}
.globe-tile{position:absolute;left:calc(var(--w) / -2);top:calc(var(--h) / -2);width:var(--w);height:var(--h);overflow:hidden;border-radius:10px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--deep);opacity:0;transition:opacity 1.2s var(--ease)}
.globe.ready .globe-tile{opacity:1}
.globe-tile img{width:100%;height:100%;object-fit:cover}
.globe-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6%;padding:8%;text-align:center;background:linear-gradient(160deg,#3a6644,#2c4f33 60%,#22402a);box-shadow:inset 0 0 0 1px rgba(255,201,212,.35),inset 0 0 0 7px #2c4f33,inset 0 0 0 8px rgba(255,201,212,.55)}
.globe-card small{font-family:var(--sans);font-size:calc(var(--w) * .045);font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--pink-lt)}
.globe-card b{font-family:var(--serif);font-weight:500;font-size:calc(var(--w) * .12);line-height:1.1;color:#fff}
@keyframes globe-spin{from{transform:rotateY(0)}to{transform:rotateY(-360deg)}}
.hero-shade{position:absolute;inset:0;z-index:0;pointer-events:none;background:radial-gradient(70% 80% at 54% 50%,transparent 30%,rgba(22,38,26,.55) 75%,rgba(22,38,26,.85)),linear-gradient(90deg,rgba(26,46,31,.96) 0%,rgba(30,52,35,.82) 34%,rgba(30,52,35,.25) 60%,rgba(30,52,35,.1) 100%)}
.hero-in{height:100%;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:minmax(0,1fr);gap:clamp(24px,4vw,64px);align-items:stretch;padding-block:clamp(20px,4svh,44px)}
.hero-main{display:flex;flex-direction:column;justify-content:center;align-items:flex-start;gap:clamp(18px,3svh,28px);min-width:0;animation:rise .9s var(--ease) both}
.hero h1{font-size:var(--s-h1);max-width:12ch}
.hero h1 em{display:block}
.hero .lead{color:#dce6dc}
@keyframes rise{from{opacity:0;transform:translateY(16px)}}
.hero-btns{display:flex;flex-wrap:wrap;gap:12px}
.pills{display:flex;flex-wrap:wrap;gap:8px}
.pills li{padding:6px 14px;border:1px solid rgba(255,255,255,.28);border-radius:999px;font-size:var(--s-small);font-weight:600}
.hero-video{height:100%;max-height:720px;align-self:center;aspect-ratio:9/16.9}
.hero-video .vbox video{object-fit:contain}
@media(max-height:760px) and (min-width:901px){.pills{display:none}}
@media(max-width:900px){
  .hero{height:auto;min-height:0;max-height:none}
  .globe-tilt{left:50%;top:30%}
  .hero-shade{background:linear-gradient(180deg,rgba(26,46,31,.55) 0%,rgba(26,46,31,.86) 45%,rgba(26,46,31,.95) 100%)}
  .hero-in{grid-template-columns:1fr;grid-template-rows:none;padding-block:36px;gap:28px}
  .hero h1{font-size:clamp(40px,11vw,60px)}
  .hero-video{height:auto;width:min(64%,280px);margin-inline:auto;aspect-ratio:9/17}
  .pills{display:none}
  .vbar{white-space:nowrap;min-width:0;overflow:hidden;font-size:12px}
}

/* ---------- xuất hiện khi cuộn ---------- */
.js [data-r]{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease);transition-delay:calc(var(--i,0) * 80ms)}
.js [data-r="right"]{transform:translateX(40px)}
.js [data-r="pic"]{transform:scale(1.04)}
.js [data-r].in,.r-all [data-r]{opacity:1;transform:none}
.w{display:inline-block;overflow:hidden;vertical-align:top;padding:.16em 0 .08em;margin:-.16em 0 -.08em}
.w>span{display:inline-block;transform:translateY(112%);transition:transform 1s var(--ease);transition-delay:calc(var(--wi,0) * 55ms)}
.in .w>span,.r-all .w>span{transform:none}
.js [data-words]{opacity:1;transform:none}

/* ---------- băng thuật ngữ ---------- */
.ticker{overflow:hidden;background:#fff;color:var(--ink);padding-block:14px;border-bottom:1px solid var(--line)}
.ticker-track{display:flex;width:max-content;animation:slide 50s linear infinite}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker p{display:flex;align-items:center;gap:30px;padding-right:30px;font-family:var(--serif);font-weight:500;font-size:clamp(20px,2vw,30px);white-space:nowrap}
.ticker i{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--cta)}
@keyframes slide{to{transform:translateX(-50%)}}

/* ---------- 1. cách dạy: tiêu đề trái, phụ đề phải; ảnh hiện đủ khung ---------- */
.method .wrap{display:flex;flex-direction:column;gap:clamp(20px,3svh,36px)}
.m-head{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:16px;align-items:end}
.m-head h2{grid-column:1/7}
.m-sub{grid-column:7/13;display:flex;flex-direction:column;gap:14px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips li{padding:6px 14px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:14px;font-weight:600}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.card{position:relative;display:flex;flex-direction:column;gap:14px}
/* ảnh lấy từ video lớp học: giữ đúng tỉ lệ gốc, neo phía trên để không mất đầu người */
.card-pic{position:relative;aspect-ratio:960/987;overflow:hidden;border-radius:var(--r);background:var(--brand)}
.card-pic img{width:100%;height:100%;object-fit:cover;object-position:center top;transition:transform 1s var(--ease)}
.tagname{position:absolute;left:12px;top:12px;padding:4px 12px;border-radius:999px;background:#fff;color:var(--ink);font-size:13px;font-weight:700}
.card-body{display:flex;flex-direction:column;gap:6px}
.num{font-weight:800;font-size:13px;letter-spacing:.08em;color:var(--cta)}
.card h3{font-size:clamp(17px,1.35vw,20px)}
.card p{font-size:15px;line-height:1.5;color:var(--ink-2)}
.card:hover img{transform:scale(1.05)}
.card:hover h3{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
.swipe{display:none}

/* ---------- 2. thử thách $40 ---------- */
.demo .wrap{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:28px;align-items:center}
.demo-text{grid-column:1/6;display:flex;flex-direction:column;gap:20px}
.vthumb{width:min(100%,400px);font:inherit;text-align:left;cursor:pointer;transition:border-color .3s}
.vthumb .vbox{aspect-ratio:16/9;flex:none}
.vthumb img{transition:transform .8s var(--ease),opacity .3s}
.vthumb:hover{border-color:var(--pink-lt)}
.vthumb:hover img{transform:scale(1.04);opacity:.85}
.vthumb:hover .vplay,.t-portrait:hover .vplay{transform:scale(1.1)}
.challenge{grid-column:7/13;background:#fff;color:var(--ink);border-radius:var(--r);padding:clamp(20px,2.4vw,32px);display:flex;flex-direction:column;gap:16px}
.ch-items{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px}
.item{display:flex;flex-direction:column;gap:2px;align-items:flex-start;text-align:left;min-height:66px;padding:10px 14px;background:var(--paper);border:1px solid var(--line);border-radius:10px;font-weight:600;transition:background-color .2s var(--ease-io),color .2s var(--ease-io),border-color .2s}
.item small{font-weight:500;font-size:13px;color:var(--ink-2)}
.item .p{font-family:var(--serif);font-size:var(--s-h3);font-weight:600}
.item:hover{border-color:var(--brand)}
.item:active{transform:scale(.98)}
.item[aria-pressed="true"]{background:var(--brand);border-color:var(--brand);color:#fff}
.item[aria-pressed="true"] small{color:#d3dfd3}
.item.up .p{color:var(--up)}
.item[aria-pressed="true"].up .p{color:var(--pink-lt)}
.ch-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 20px}
.ch-total{font-size:var(--s-lead);font-weight:700}
.ch-total.over{color:var(--up)}
.ch-note{font-size:13px;color:var(--ink-2)}
.ch-result{padding:14px 16px;background:#ffe4ea;border-radius:10px;font-weight:500;line-height:1.55;animation:pop .45s var(--ease)}
.ch-result b{font-weight:700}
@keyframes pop{from{opacity:0;transform:translateY(8px)}}
.js .ch-static{display:none}
.ch-live{display:none}
.js .ch-live{display:flex;flex-direction:column;gap:16px}

/* ---------- 3. giáo viên ---------- */
.teachers .wrap{display:flex;flex-direction:column;gap:clamp(24px,4svh,40px)}
.t-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px 32px}
.t-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.teacher{display:grid;grid-template-columns:clamp(110px,12vw,160px) minmax(0,1fr);gap:22px;align-items:start;padding:20px;background:var(--paper);border-radius:var(--r);transition:background-color .3s}
.teacher:hover{background:#ebe9e3}
.t-portrait{position:relative;display:block;width:100%;padding:0;border:0;aspect-ratio:4/5;overflow:hidden;border-radius:calc(var(--r) - 2px);background:var(--brand)}
.t-portrait img{width:100%;height:100%;object-fit:cover;object-position:center 15%;transition:transform 1s var(--ease)}
.t-portrait .vplay{width:42px;height:42px;margin:0;left:auto;top:auto;right:8px;bottom:8px}
.t-portrait .vplay svg{width:16px;height:16px}
.teacher:hover .t-portrait img{transform:scale(1.05)}
.t-panel{display:flex;flex-direction:column;gap:10px;min-width:0}
.t-panel h3{font-family:var(--serif);font-weight:500;font-size:clamp(22px,1.9vw,28px)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags li{padding:2px 10px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:13px;font-weight:600}
.t-cred{font-size:var(--s-small);line-height:1.5;font-weight:600;color:var(--brand)}
.t-how{font-size:15px;line-height:1.5;color:var(--ink-2)}
.teacher .more{color:var(--cta)}

/* ---------- 4. không gian học ---------- */
.space .wrap{display:flex;flex-direction:column;gap:clamp(20px,3svh,32px)}
.s-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px 32px}
.s-head h2,.t-head h2{max-width:none}
.gal{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));grid-auto-rows:clamp(104px,calc((100svh - var(--hdr) - 2 * var(--pad) - 150px) / 3),210px);grid-auto-flow:dense;gap:10px}
.gal figure{position:relative;overflow:hidden;border-radius:var(--r);background:var(--deep)}
.gal button{display:block;width:100%;height:100%;padding:0;border:0;background:none;cursor:zoom-in}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s var(--ease),opacity .4s}
.gal figure:hover img{transform:scale(1.05)}
.gal figcaption{position:absolute;left:8px;bottom:8px;padding:4px 12px;border-radius:999px;background:#fff;color:var(--ink);font-size:13px;font-weight:600;opacity:0;transform:translateY(8px);transition:opacity .3s,transform .35s var(--ease)}
.gal figure:hover figcaption,.gal figure:focus-within figcaption{opacity:1;transform:none}
.g-big{grid-column:span 2;grid-row:span 2}
.g-wide{grid-column:span 2}
.g-tall{grid-row:span 2}
.lb{padding:0;border:0;border-radius:var(--r);background:#000;color:#fff;max-width:min(94vw,1200px);max-height:94svh}
.lb::backdrop{background:rgba(14,24,16,.9)}
.lb-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 8px 8px 16px;background:var(--brand)}
.lb-bar p{font-weight:600}
.lb-btns{display:flex;gap:8px}
.lb-btns button{min-height:44px;min-width:44px;padding:0 16px;background:var(--brand);color:#fff;border:1px solid rgba(255,255,255,.35);border-radius:999px;font-weight:700}
.lb-btns button:hover{background:#fff;color:var(--ink)}
#lb-img{display:block;max-width:100%;max-height:82svh;margin:0 auto;object-fit:contain}

/* ---------- 5. lộ trình (thẻ chuyển) ---------- */
.road .wrap{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:28px;align-items:center}
.road-side{grid-column:1/6;display:flex;flex-direction:column;gap:20px;align-items:flex-start}
.r-tabs{display:flex;flex-direction:column;gap:8px;width:100%}
.r-tabs [role=tab]{position:relative;display:flex;align-items:baseline;justify-content:space-between;gap:16px;width:100%;padding:14px 22px;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:var(--r);text-align:left;transition:background-color .25s var(--ease-io),color .25s,border-color .25s}
.r-tabs b{font-family:var(--serif);font-size:clamp(22px,2vw,30px);font-weight:500}
.r-tabs small{font-size:var(--s-small);font-weight:600;color:var(--ink-2)}
/* hover chỉ đổi viền với thẻ chưa chọn; thẻ đang chọn giữ nền navy nên chữ trắng không bị chìm */
.r-tabs [role=tab]:not([aria-selected=true]):hover{border-color:var(--brand);background:#eef3ee}
.r-tabs [aria-selected=true]{background:var(--brand);border-color:var(--brand);color:#fff;cursor:default}
.r-tabs [aria-selected=true] small{color:var(--pink-lt)}
.r-panels{grid-column:7/13;display:flex;flex-direction:column;gap:16px}
.r-panel{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;animation:pop .45s var(--ease)}
.r-pic{position:relative;height:clamp(150px,26svh,260px);overflow:hidden}
.r-pic img{width:100%;height:100%;object-fit:cover;object-position:center 30%}
.r-code{position:absolute;left:12px;bottom:12px;padding:5px 14px;border-radius:999px;background:#fff;color:var(--ink);font-size:13px;font-weight:700}
.r-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));counter-reset:rs}
.r-steps li{display:flex;flex-direction:column;gap:6px;padding:18px 20px 20px;counter-increment:rs}
.r-steps li+li{border-left:1px solid var(--line)}
.r-steps b{font-size:16px}
.r-steps b::before{content:"0" counter(rs);display:block;margin-bottom:4px;font-size:13px;font-weight:800;letter-spacing:.08em;color:var(--cta)}
.r-steps span{font-size:14px;line-height:1.5;color:var(--ink-2)}
.road-note{font-size:var(--s-small);color:var(--ink-2)}

/* ---------- 6. form + các bước ---------- */
.form-sec .wrap{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:32px;align-items:center}
.form-intro{grid-column:1/6;display:flex;flex-direction:column;gap:20px}
.steps{--p:0;position:relative;display:flex;flex-direction:column;gap:14px;font-size:var(--s-body);font-weight:600}
.steps::before,.steps::after{content:"";position:absolute;z-index:0;left:17px;top:18px;width:2px}
.steps::before{bottom:18px;background:repeating-linear-gradient(to bottom,rgba(255,255,255,.3) 0 5px,transparent 5px 10px)}
.steps::after{height:calc((100% - 36px) * var(--p));background:var(--pink-lt);transition:height .2s linear}
.steps li{position:relative;z-index:1;display:flex;align-items:center;gap:16px;min-height:36px}
.st-n{display:grid;place-items:center;flex:none;width:36px;height:36px;border-radius:50%;background:var(--brand);border:2px solid rgba(255,255,255,.45);font-size:15px;font-weight:700;line-height:1;font-variant-numeric:tabular-nums;transition:background .4s,border-color .4s,color .4s}
.steps li.on .st-n{background:var(--pink-lt);border-color:var(--pink-lt);color:var(--ink)}
.form-card{grid-column:7/13;background:#fff;color:var(--ink);border-radius:var(--r);padding:clamp(20px,2.4vw,32px);display:flex;flex-direction:column;gap:14px;position:relative;box-shadow:0 30px 60px -34px rgba(10,20,12,.8)}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:15px}
.field input,.field select,.field textarea{width:100%;min-height:46px;padding:10px 14px;background:#fff;border:1px solid #b9c2ba;border-radius:10px;font-weight:400;font-size:16px;transition:border-color .2s var(--ease-io),box-shadow .2s}
.field textarea{min-height:68px;resize:vertical}
.field input:hover,.field select:hover,.field textarea:hover{border-color:var(--brand)}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--brand);outline:0;box-shadow:0 0 0 3px rgba(44,79,51,.22)}
.field .err{display:none;color:#b3261b;font-size:13px;font-weight:600}
.field.bad input,.field.bad select{border-color:#b3261b}
.field.bad .err{display:block;animation:pop .35s var(--ease)}
fieldset{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;min-width:0}
legend{padding:0;font-weight:600;font-size:15px;margin-bottom:6px}
.choices{display:flex;flex-wrap:wrap;gap:6px}
.choices label{position:relative}
.choices input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.choices span{display:inline-flex;align-items:center;min-height:42px;padding:8px 18px;background:#fff;border:1px solid #b9c2ba;border-radius:999px;font-weight:600;font-size:15px;transition:background-color .2s var(--ease-io),color .2s var(--ease-io),border-color .2s}
.choices label:hover span{border-color:var(--brand)}
.choices input:checked+span{background:var(--brand);color:#fff;border-color:var(--brand)}
.choices input:focus-visible+span{outline:3px solid var(--brand);outline-offset:2px}
.note-more summary{display:inline-flex;align-items:center;gap:8px;min-height:32px;font-size:var(--s-small);font-weight:600;color:var(--brand);cursor:pointer;list-style:none}
.note-more summary::-webkit-details-marker{display:none}
.note-more summary::before{content:"+";font-weight:800;font-size:18px;line-height:1;transition:transform .3s var(--ease-io)}
.note-more[open] summary::before{transform:rotate(45deg)}
.note-more .field{margin-top:6px}
.consent{display:flex;gap:12px;align-items:flex-start;font-size:13px;line-height:1.5;color:var(--ink-2)}
.consent input{width:20px;height:20px;margin-top:1px;flex:none;accent-color:var(--ink)}
.form-card .btn{width:100%}
.form-card .btn:disabled{opacity:.6;cursor:wait;background:var(--cta);color:#fff}
.form-msg{padding:12px 14px;font-weight:600;font-size:15px;background:#ffe4ea;border-radius:10px}
.hp{position:absolute;left:0;top:0;width:2px;height:2px;overflow:hidden;clip-path:inset(50%);opacity:0;pointer-events:none}

/* ---------- 7. câu hỏi: danh sách + khung trả lời ---------- */
.faq .wrap{display:flex;flex-direction:column;gap:clamp(22px,3.4svh,40px)}
.faq-box{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:20px}
.faq-q{display:flex;flex-direction:column;gap:8px}
.faq-q [role=tab]{position:relative;display:flex;align-items:center;gap:16px;min-height:60px;padding:12px 22px;background:var(--paper);color:var(--ink);border:1px solid transparent;border-radius:var(--r);text-align:left;font-weight:600;font-size:clamp(15px,1.15vw,17px);line-height:1.35;transition:background-color .25s var(--ease-io),color .25s,border-color .25s}
.faq-q [role=tab]:not([aria-selected=true]):hover{border-color:var(--brand);background:#eef3ee}
.faq-q [aria-selected=true]{background:var(--brand);color:#fff;cursor:default}
.fq-n{font-size:13px;font-weight:800;letter-spacing:.08em;color:var(--cta);flex:none}
.faq-q [aria-selected=true] .fq-n{color:var(--pink-lt)}
.faq-a{display:flex;flex-direction:column;justify-content:space-between;gap:24px;padding:clamp(24px,3vw,44px);background:var(--paper);border-radius:var(--r)}
.faq-a [role=tabpanel]{display:flex;flex-direction:column;gap:14px;animation:pop .4s var(--ease)}
.fa-q{font-family:var(--serif);font-weight:500;font-size:clamp(24px,2.2vw,32px);line-height:1.2}
.faq-a [role=tabpanel] p:not(.fa-q){font-size:var(--s-lead);line-height:1.6;max-width:52ch;color:var(--ink-2)}
.faq-a .more{align-self:flex-start;color:var(--cta)}

/* ---------- footer ---------- */
.ftr{position:relative;overflow:hidden;background:var(--brand);background-image:var(--grad);color:#fff}
.ftr-in{padding-block:clamp(48px,7svh,88px) 112px;display:flex;flex-direction:column;gap:clamp(32px,6svh,72px)}
.ftr-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px 32px;font-size:15px;line-height:1.6;color:#d3dfd3}
.ftr-notes a{text-decoration:underline;text-underline-offset:4px}
.ftr-notes [data-text]{white-space:pre-line}
.ftr-cta{display:inline-flex;align-items:center;gap:.3em;align-self:flex-start;font-family:var(--serif);font-weight:500;font-size:clamp(44px,8vw,120px);letter-spacing:-.02em;line-height:1.05;transition:gap .35s var(--ease-io),color .25s}
.ftr-cta:hover{gap:.5em;color:var(--pink-lt)}
.ftr-cta svg{width:.7em;height:.7em;flex:none}
.ftr-meta{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;font-size:var(--s-small);color:#b3c2b3;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}

/* ---------- tiện ích ---------- */
.cursor{position:fixed;left:0;top:0;z-index:70;pointer-events:none;padding:8px 16px;border-radius:999px;background:var(--cta);color:#fff;font-size:13px;font-weight:700;white-space:nowrap;opacity:0;transform:translate(-50%,-50%) scale(.6);transition:opacity .2s,transform .2s var(--ease)}
.cursor.on{opacity:1}
.totop{position:fixed;right:clamp(16px,2vw,32px);bottom:clamp(16px,2vw,32px);z-index:45;display:grid;place-items:center;width:50px;height:50px;border-radius:50%;background:var(--brand);color:#fff;border:1px solid rgba(255,255,255,.2);opacity:0;transform:translateY(16px);pointer-events:none;transition:opacity .3s,transform .3s var(--ease),background .2s}
.totop.show{opacity:1;transform:none;pointer-events:auto}
.totop:hover{background:var(--cta)}
.totop svg{width:20px;height:20px;transform:rotate(-90deg)}
.dock{display:none}
.vdlg{padding:8px;border:1px solid rgba(255,255,255,.22);border-radius:var(--r);background:var(--brand);color:#fff;width:min(92vw,460px);max-height:94svh;overflow:hidden}
.vdlg[open]{display:flex;flex-direction:column;animation:pop .35s var(--ease)}
.vdlg::backdrop{background:rgba(14,24,16,.88)}
.vdlg .vbar{padding:0 0 8px 4px}
.dlg-close{margin-left:auto;min-height:40px;padding:0 18px;background:transparent;color:#fff;border:1px solid rgba(255,255,255,.3);border-radius:999px;font-weight:700;font-size:13px;transition:background .2s,color .2s}
.dlg-close:hover{background:#fff;color:var(--ink)}
#dlg-video{display:block;width:100%;max-height:calc(94svh - 70px);background:#000;object-fit:contain;border-radius:calc(var(--r) - 4px)}

/* trang cảm ơn */
.thanks{min-height:calc(100svh - var(--hdr));display:grid;align-items:center}
.thanks .wrap{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:36px;align-items:center}
.thanks-text{grid-column:1/7;display:flex;flex-direction:column;gap:22px}
.thanks-pic{grid-column:8/13;aspect-ratio:4/5;overflow:hidden;border-radius:var(--r)}
.thanks-pic img{width:100%;height:100%;object-fit:cover}
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn-line{background:transparent;color:inherit;border-color:currentColor}
.btn-line:hover{background:#fff;border-color:#fff;color:var(--ink)}

/* ---------- màn hình loading theo logo Intertu ---------- */
.loader{position:fixed;inset:0;z-index:200;display:grid;place-items:center;background:var(--brand);background-image:var(--grad);color:#fff;animation:loader-out .7s var(--ease-io) 3.2s forwards}
.no-loader .loader{display:none}
.loader.done{animation:loader-out .7s var(--ease-io) forwards}
.ld-in{display:flex;flex-direction:column;align-items:center;gap:28px}
.ld-logo{position:relative;width:min(300px,64vw);aspect-ratio:640/431}
.ld-logo img{position:absolute;inset:0;width:100%;height:100%}
/* logo hiện bằng một đường quét chéo mềm: từ các trang sách (góc dưới trái) sang chữ */
.ld-logo img{-webkit-mask-image:linear-gradient(55deg,#000 42%,transparent 58%);mask-image:linear-gradient(55deg,#000 42%,transparent 58%);-webkit-mask-size:320% 100%;mask-size:320% 100%;-webkit-mask-position:100% 0;mask-position:100% 0;animation:ld-sweep 1.2s var(--ease-io) .1s forwards}
.ld-logo{animation:ld-pop 1.6s var(--ease) both}
@keyframes ld-sweep{to{-webkit-mask-position:0 0;mask-position:0 0}}
@keyframes ld-pop{from{transform:scale(.94);opacity:.4}to{transform:none;opacity:1}}
.ld-bar{width:min(220px,50vw);height:2px;background:rgba(255,255,255,.18);overflow:hidden;border-radius:2px}
.ld-bar i{display:block;height:100%;background:var(--pink-lt);transform-origin:0 50%;animation:ld-bar 1.4s var(--ease-io) .2s both}
@keyframes ld-bar{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes loader-out{to{transform:translateY(-100%);visibility:hidden}}

/* ---------- tablet và điện thoại ---------- */
@media(max-width:1100px){
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .card-pic{max-height:none}
  .t-grid{grid-template-columns:1fr}
  .demo-text,.challenge{grid-column:1/13}
  .road-side,.r-panels{grid-column:1/13}
  .gal{grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:150px}
}
@media(max-width:900px){
  :root{--pad:44px}
  .m-head{display:flex;flex-direction:column;align-items:flex-start}
  .cards{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;margin-inline:calc(-1 * var(--m));padding-inline:var(--m);scroll-padding-inline:var(--m);scrollbar-width:none}
  .cards::-webkit-scrollbar{display:none}
  .card{flex:0 0 78%;scroll-snap-align:start}
  .swipe{display:flex;align-items:center;gap:10px;font-size:var(--s-small);font-weight:700;margin-top:-8px}
  .swipe svg{width:18px;height:18px;animation:nudge 1.6s var(--ease-io) infinite}
  @keyframes nudge{50%{transform:translateX(8px)}}
  .demo .wrap,.form-sec .wrap,.road .wrap{display:flex;flex-direction:column;align-items:stretch}
  .ch-items{grid-template-columns:repeat(2,minmax(0,1fr))}
  .vthumb{width:100%}
  .teacher{grid-template-columns:minmax(0,34%) minmax(0,1fr);gap:14px;padding:14px}
  .t-how{display:none}
  .teacher .more{font-size:13px;white-space:nowrap}
  .gal{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:8px;margin-inline:calc(-1 * var(--m));padding-inline:var(--m);scroll-padding-inline:var(--m);scrollbar-width:none}
  .gal::-webkit-scrollbar{display:none}
  .gal figure{flex:0 0 78%;height:230px;scroll-snap-align:start}
  .gal figure.g-tall{flex-basis:50%}
  .gal figcaption{opacity:1;transform:none}
  .r-tabs{flex-direction:row;gap:6px}
  .r-tabs [role=tab]{flex-direction:column;gap:2px;padding:10px 12px}
  .r-tabs b{font-size:21px}
  .r-tabs small{font-size:12px}
  .road-side .btn{order:5}
  .r-pic{display:none}
  .r-steps{grid-template-columns:1fr}
  .r-steps li+li{border-left:0;border-top:1px solid var(--line)}
  .r-steps li{padding:14px 16px}
  .f-row{grid-template-columns:1fr}
  .faq-box{grid-template-columns:1fr;gap:12px}
  .faq-q [role=tab]{min-height:52px;padding:10px 16px}
  .faq-a{padding:20px 16px}
  .ftr-notes{grid-template-columns:1fr}
  .ftr-in{padding-block:40px 56px;gap:28px}
  .ticker{padding-block:10px}
  .thanks .wrap{display:flex;flex-direction:column;align-items:stretch}
  .totop{bottom:76px}
  .dock{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;gap:8px;padding:10px var(--m) calc(10px + env(safe-area-inset-bottom));background:#fff;color:var(--ink);border-top:1px solid var(--line);transition:transform .35s var(--ease)}
  .dock .btn{flex:1}
  .dock .icon-btn{flex:none}
  .dock.off,.dock.down{transform:translateY(110%)}
  .cursor{display:none}
}
@media(hover:none){.cursor{display:none}}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .loader{display:none}
  .js [data-r]{opacity:1;transform:none}
  .w>span{transform:none}
}

@media (min-width:1101px){.teacher-gia-khang{grid-column:1/-1;width:calc(50% - 10px);justify-self:center}}

/* Khung video giới thiệu ngang và nút xem lớp học */
.vdlg.video-wide{width:min(92vw,800px)}
button.class-video{display:block;width:100%;padding:0;border:0;text-align:left;cursor:pointer}
.class-video:hover .vplay{transform:scale(1.1)}

/* Cập nhật phần giới thiệu, thư viện và chân trang */
.m-head{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.method-intro{max-width:790px}
.gal figure[hidden]{display:none}.gal-more{align-self:flex-start}
.ftr-notes{grid-template-columns:repeat(4,minmax(0,1fr))}.ftr-notes p{display:flex;flex-direction:column;gap:8px}.ftr-label{color:#fff;font-size:16px;letter-spacing:.02em}.ftr-notes [data-text],.ftr-notes p>span{color:#e0eae0}
.lesson-picker{width:min(92vw,760px);max-height:85svh;overflow:auto;padding:clamp(20px,4vw,36px);border:0;border-radius:18px;background:#f4f2ec;color:#1f2921}.lesson-picker::backdrop{background:rgba(14,24,16,.86)}.lesson-head{display:flex;gap:20px;justify-content:space-between;align-items:start;margin-bottom:22px}.lesson-head p{font-size:12px;font-weight:700;letter-spacing:.12em;color:#af3e59}.lesson-head h2{font-family:var(--serif);font-size:clamp(26px,4vw,38px);line-height:1.15}.lesson-head button{border:1px solid #bbc4b9;border-radius:999px;background:transparent;padding:8px 16px}.lesson-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.lesson-choice{display:grid;grid-template-columns:1fr auto;text-align:left;gap:4px 12px;padding:16px;border:1px solid #dddcd4;background:#fff;border-radius:12px;color:#1f2921}.lesson-choice span{font-weight:700}.lesson-choice small{grid-column:1;color:#59665b}.lesson-choice b{grid-column:2;grid-row:1/3;align-self:center;color:#b33e5a}.lesson-choice:hover,.lesson-choice:focus-visible{border-color:#af3e59}
@media(max-width:900px){.ftr-notes{grid-template-columns:repeat(2,minmax(0,1fr))}.r-pic{display:block;height:210px}}
@media(max-width:540px){.lesson-list{grid-template-columns:1fr}.ftr-notes{grid-template-columns:1fr 1fr;gap:22px 16px}.ftr-notes p{overflow-wrap:anywhere}}

/* Hero trên điện thoại: hai nút cùng hàng, video dọc đủ khung */
@media (max-width: 900px) {
  .hero-btns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; width: 100%; }
  .hero-btns > .btn, .hero-btns > .btn-ghost {
    width: 100%; min-width: 0; min-height: 60px; padding: 8px 10px;
    justify-content: center; text-align: center; font-size: clamp(12px, 3.3vw, 14px); line-height: 1.2;
  }
  .hero-btns > .btn { gap: 4px; }
  .hero-btns > .btn svg { display: none; }
  .hero-btns > .btn-ghost { gap: 6px; }
  .hero-btns > .btn-ghost .ic { width: 28px; height: 28px; flex: none; }
  .hero-btns > .btn-ghost .ic svg { width: 12px; height: 12px; }
  .hero-video { width: 100%; height: auto; max-height: none; margin-inline: 0; aspect-ratio: auto; }
  .hero-video .vbox { flex: none; width: 100%; aspect-ratio: 9 / 16; }
  .hero-video .vbox video { display: block; width: 100%; height: 100%; object-fit: contain; }
}

.faq-mobile-answer{display:none}
@media(max-width:900px){
  .faq-mobile-ready .faq-mobile-answer:not([hidden]){display:block;padding:14px 16px 18px;border-radius:var(--r);background:var(--paper);color:var(--ink-2);line-height:1.6}
  .faq-mobile-ready .faq-a [role=tabpanel]:not([hidden]){position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
  .faq-mobile-ready .faq-a{padding:0;background:transparent}
}

/* Ổn định trình phát trên màn hình nhỏ, giữ các nút điều khiển có thể chạm */
.vdlg{width:min(92vw,460px,47svh);max-height:94svh;overflow:auto}
.vdlg.video-wide{width:min(92vw,800px)}
.vdlg .vbar{flex:none}.vdlg .vbox{flex:none;width:100%;aspect-ratio:9/16;min-height:0}
.vdlg.video-wide .vbox{aspect-ratio:16/9}
.vdlg .vbox #dlg-video{display:block;width:100%;height:100%;max-height:none;object-fit:contain}
.video-status{font-size:13px;line-height:1.4;padding:4px 6px 8px;color:#fff}
.hero-video .vbox video{pointer-events:auto}
.amb-grid{background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);animation-duration:6s}
.ch-paper .amb-grid,.ch-sand .amb-grid{background-image:linear-gradient(rgba(30,42,33,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(30,42,33,.09) 1px,transparent 1px)}
.amb-orbit{border-color:rgba(255,201,212,.34);animation-duration:6s}.amb-orbit.o2{animation-duration:7s}.amb-band{border-top-color:rgba(255,201,212,.34);animation-duration:5s}.amb-band.b2{animation-duration:6s}
.ch-paper .amb-orbit,.ch-sand .amb-orbit{border-color:rgba(44,79,51,.22)}.ch-paper .amb-band,.ch-sand .amb-band{border-top-color:rgba(194,56,90,.27)}

.required-mark{color:#b3261b;font-weight:700}