:root{--paper:#faf9f5;--ink:#192d42;--muted:#596473;--line:#d9dfdf;--soft:#f0f1e8;--lime:#e8f1a8;--blue:#355cdd;--ok:#2f7a4f;--beta:#8a6a12;--lab:#b0402f;--sans:'Be Vietnam Pro',system-ui,sans-serif;--serif:'Fraunces',Georgia,serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 15px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
h2,h3,p{margin:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
[hidden]{display:none!important}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:99;background:var(--ink);color:var(--paper);padding:8px 14px;border-radius:6px}

.s-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:18px;height:64px;padding:0 max(24px,calc((100% - 1360px)/2));background:#faf9f5f2;backdrop-filter:blur(14px);border-bottom:1px solid #192d4214}
.s-mark{font-family:var(--serif);font-weight:700;font-size:32px;letter-spacing:-2px;color:var(--ink);text-decoration:none;line-height:1}.s-mark span{color:var(--blue)}
.s-title{font-weight:600;font-size:15px;padding-left:18px;border-left:1px solid var(--line)}
.s-version{font-size:12px;color:var(--muted);background:var(--soft);padding:3px 9px;border-radius:99px}
.s-help{margin-left:auto;font-size:14px;color:var(--ink);text-underline-offset:4px}

.studio{display:grid;grid-template-columns:minmax(0,1fr) minmax(380px,520px);gap:40px;width:min(1360px,calc(100% - 48px));margin:28px auto 0;align-items:start}
.rail{min-width:0}
.step{padding:26px 0 30px;border-bottom:1px solid var(--line)}
.step:first-child{padding-top:4px}
.step h2{display:flex;align-items:center;gap:12px;font-family:var(--serif);font-weight:600;font-size:26px;letter-spacing:-.6px;line-height:1.2;margin-bottom:16px}
.step h2 span{display:grid;place-items:center;flex:none;width:30px;height:30px;border-radius:50%;background:var(--ink);color:var(--paper);font:600 14px var(--sans);letter-spacing:0}
.step-hint{color:var(--muted);font-size:14px;margin:-6px 0 16px}

.type-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.type-card,.style-card,.chip,.seg{border:1px solid var(--line);background:#fff;border-radius:12px;text-align:left;transition:border-color .15s,box-shadow .15s,background .15s}
.type-card:hover,.style-card:hover,.chip:hover,.seg:hover{border-color:#192d4255}
.type-card{display:flex;flex-direction:column;gap:6px;padding:14px 16px;min-height:112px}
.type-card strong{font-size:15px;line-height:1.35}
.type-card span{font-size:13px;line-height:1.5;color:var(--muted)}
[aria-checked=true].type-card,[aria-checked=true].style-card,[aria-checked=true].seg{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink);background:#fff}
[aria-checked=true].type-card{background:var(--ink);color:var(--paper)}[aria-checked=true].type-card span{color:#c8d2dc}

.style-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(176px,1fr));gap:12px}
.style-card{display:flex;flex-direction:column;padding:0;overflow:hidden}
.thumb{display:block;aspect-ratio:16/10;background:var(--soft);overflow:hidden;position:relative}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb-empty{position:absolute;inset:0;display:grid;place-items:center;font-size:12px;color:var(--muted)}
.style-body{display:flex;flex-direction:column;gap:3px;padding:10px 12px 12px;flex:1}
.style-body small{font-size:11.5px;color:var(--muted);line-height:1.4}
.style-body strong{font-size:14px;line-height:1.35;margin-bottom:6px}
.badge{align-self:flex-start;margin-top:auto;font-size:11px;font-weight:600;padding:2px 8px;border-radius:99px;white-space:nowrap}
.badge.ok{background:#e3f1e8;color:var(--ok)}.badge.beta{background:#f6eccd;color:var(--beta)}.badge.lab{background:#f7e1dc;color:var(--lab)}

.field{margin-bottom:18px}
.label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:9px 15px;font-size:14px;border-radius:99px}
[aria-checked=true].chip{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.chips-goal{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.chip-goal{border-radius:12px;display:flex;flex-direction:column;gap:2px;padding:11px 14px}
.chip-goal strong{font-size:14px}.chip-goal span{font-size:12.5px;color:var(--muted);line-height:1.45}
[aria-checked=true].chip-goal span{color:#c8d2dc}

.segmented{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.seg{display:flex;flex-direction:column;gap:4px;padding:14px 16px}
.seg strong{font-size:15px}.seg span{font-size:12.5px;line-height:1.45;color:var(--muted)}
[aria-checked=true].seg{background:var(--lime)}
.options{margin-top:14px;border:1px solid var(--line);border-radius:12px;background:#fff}
.options summary{padding:13px 16px;font-weight:600;font-size:14px;cursor:pointer}
.options summary small{font-weight:400;color:var(--muted);margin-left:6px}
#options{padding:4px 16px 12px}
.opt{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:9px 0;border-top:1px solid #192d420d}
.opt label{font-size:14px}
.opt select{min-width:120px;padding:6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--paper)}
.opt input[type=checkbox]{width:20px;height:20px;accent-color:var(--ink)}

#profile input,#profile select,#profile textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:15px}
#profile textarea{resize:vertical;line-height:1.55}
#profile [aria-invalid=true]{border-color:var(--lab)}
.field-error{display:block;font-size:12.5px;color:var(--lab);min-height:0}
.link-button{background:none;border:0;padding:6px 0;font-size:13px;color:var(--muted);text-decoration:underline;text-underline-offset:4px}

.stage{position:sticky;top:84px;display:flex;flex-direction:column;gap:16px;max-height:calc(100dvh - 100px);overflow:auto;padding-bottom:8px;scrollbar-width:thin}
.demo{background:var(--ink);color:var(--paper);border-radius:16px;padding:14px}
.demo-frame{position:relative;background:#0d1824;border-radius:10px;overflow:hidden;display:grid;place-items:center;height:min(40dvh,380px)}
.demo-frame video{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#0d1824}
.demo-empty{color:#c8d2dc;font-size:14px;padding:24px;text-align:center}
.demo-meta{display:flex;justify-content:space-between;align-items:start;gap:12px;margin-top:12px}
.demo-meta h3{font-size:16px;line-height:1.35}
.demo-meta p{font-size:13px;color:#c8d2dc;margin-top:3px;line-height:1.5}
.demo-thumbs{display:flex;gap:6px;margin-top:10px}
.demo-thumb{background:transparent;border:1px solid #ffffff33;color:var(--paper);border-radius:99px;font-size:12px;padding:4px 12px}
.demo-thumb[aria-pressed=true]{background:var(--lime);color:var(--ink);border-color:var(--lime)}
.warnings{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:6px}
.warnings li{font-size:13px;line-height:1.5;background:#ffffff12;border-left:3px solid #f0c66b;padding:7px 10px;border-radius:4px}
.warnings:empty{display:none}

.prompt-card{border:1px solid var(--line);border-radius:16px;background:#fff;padding:14px}
.prompt-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px}
.prompt-head h3{font-size:15px}
.copy{background:var(--blue);color:#fff;border:0;border-radius:99px;padding:10px 20px;font-weight:600;font-size:14px;min-height:44px;white-space:nowrap}
.copy:disabled{background:#c6ccd3;cursor:not-allowed}
#prompt{margin:0;font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--soft);border-radius:10px;padding:12px;max-height:340px;overflow:auto}
.copy-status{font-size:13px;color:var(--muted);margin-top:8px;min-height:1.6em}

.howto{width:min(1360px,calc(100% - 48px));margin:56px auto 80px;padding-top:32px;border-top:1px solid var(--line);max-width:820px;margin-left:max(24px,calc((100% - 1360px)/2))}
.howto h2{font-family:var(--serif);font-size:30px;letter-spacing:-.6px;margin-bottom:16px}
.howto ol{padding-left:22px;margin:0 0 18px;display:flex;flex-direction:column;gap:10px}
.howto code{font-size:13px;background:var(--soft);padding:1px 6px;border-radius:5px}
.fine{font-size:13px;color:var(--muted)}
.news-bar{width:min(1360px,calc(100% - 48px));margin:14px auto 0;padding:10px 14px;border-radius:10px;background:var(--lime);font-size:14px;line-height:1.5}
.news-bar a{color:var(--ink);font-weight:600;text-underline-offset:4px;white-space:nowrap}
.field-hint{display:block;font-size:12.5px;color:var(--muted);margin-top:4px}
.label small{font-weight:400;color:var(--muted)}
#source{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:15px}
#source[aria-invalid=true]{border-color:var(--lab)}
.guide{max-width:960px;margin:56px 0 0 max(24px,calc((100% - 1360px)/2));padding-top:32px;border-top:1px solid var(--line)}
.guide h2{font-family:var(--serif);font-size:30px;letter-spacing:-.6px;line-height:1.2;margin-bottom:12px}
.guide h2 small{font:500 14px var(--sans);color:var(--muted);letter-spacing:0;margin-left:8px}
.news{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:12px;padding:20px 22px;margin-bottom:44px}
.news ul{margin:0 0 12px;padding-left:20px;display:flex;flex-direction:column;gap:8px}
.news code,.guide code{font-size:13px;background:var(--soft);padding:1px 6px;border-radius:5px;overflow-wrap:anywhere}
.lede{color:var(--muted);margin:-4px 0 18px}
.pick{margin:0 0 22px;border-top:1px solid var(--line)}
.pick>div{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr);gap:20px;padding:14px 0;border-bottom:1px solid var(--line)}
.pick dt{font-weight:600}.pick dd{margin:0}
.pick-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.pick-grid>div{background:var(--soft);border-radius:12px;padding:16px 18px}
.pick-grid b{white-space:nowrap}
#cap-nhat,#chon-the-nao,#cach-dung{scroll-margin-top:80px}
.pick-grid h3{font-family:var(--serif);font-size:19px;margin-bottom:6px}.pick-grid p{margin:0;font-size:14.5px}
.mobile-bar{display:none}

@media (max-width:1060px){
 .studio{grid-template-columns:1fr;gap:8px}
 .stage{position:static;max-height:none;overflow:visible}
 .type-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
 body{padding-bottom:76px}
 .s-header{gap:12px;padding:0 16px;height:58px}
 .s-mark{font-size:28px}.s-help{display:none}.s-title{padding-left:12px;font-size:14px}.s-version{display:none}
 .studio,.howto,.guide,.news-bar{width:calc(100% - 32px);margin-inline:16px}
 .pick>div{grid-template-columns:1fr;gap:4px}.pick-grid{grid-template-columns:1fr}
 .step h2{font-size:22px}
 .type-grid{grid-template-columns:1fr 1fr;gap:8px}
 .type-card{min-height:0;padding:12px}.type-card span{display:none}
 [aria-checked=true].type-card span{display:block}
 .style-grid{grid-template-columns:1fr 1fr;gap:8px}
 .chips-goal,.segmented{grid-template-columns:1fr}
 .demo-frame{height:56dvh}
 .mobile-bar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;align-items:center;gap:12px;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:var(--ink);color:var(--paper)}
 .mobile-bar a{flex:1;min-width:0;display:block;line-height:44px;font-size:13px;color:var(--paper);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-underline-offset:4px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}