@font-face{font-family:"Inter";src:url("/assets/fonts/inter-latin.woff2") format("woff2");font-weight:100 900;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-vietnamese.woff2") format("woff2");font-weight:100 900;font-display:swap;unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-latin-ext.woff2") format("woff2");font-weight:100 900;font-display:swap;unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
/* Nhận diện MAX: đen-trắng-xám, lime chỉ để nhấn (nút chính, lựa chọn đang chọn) */
:root{--lime:#CCEF0B;--lime-web:#C1F11D;--ink:#0A0A0A;--text:#212529;--muted:#6B6B70;--line:#E4E4E4;--grey:#F2F2F2;--card:#F9F9F9;--dark:linear-gradient(180deg,#343433 0%,#00010F 100%);--font:Inter,-apple-system,system-ui,"Segoe UI",sans-serif}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;background:#00010F}
body{background:#fff;color:var(--text);font:16px/1.55 var(--font);-webkit-font-smoothing:antialiased;min-height:100dvh}
img{display:block}
button,input,textarea,select{font:inherit;color:inherit}
button,a,input,label,textarea{-webkit-tap-highlight-color:transparent}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
h1,h2{color:var(--ink);font-weight:700;letter-spacing:-.025em;text-wrap:balance}
h1{font-size:clamp(34px,9vw,52px);line-height:1.08}
h2{font-size:clamp(28px,7vw,34px);line-height:1.15}
p,legend,small,li{text-wrap:pretty}

/* Phần giới thiệu: nền tối + quầng lime */
.intro{position:relative;overflow:hidden;background:var(--dark);color:#fff;padding:20px 20px 64px}
.intro::before{content:"";position:absolute;width:520px;height:520px;right:-220px;top:-260px;border-radius:50%;background:radial-gradient(circle,rgba(193,241,29,.55) 0%,rgba(193,241,29,.18) 38%,transparent 68%);pointer-events:none}
.intro-in{position:relative;width:min(560px,100%);margin:0 auto}
.intro h1{color:#fff;margin-top:30px}
.intro mark{background:none;color:var(--lime-web);white-space:nowrap}
.intro .lead{margin-top:12px;color:rgba(255,255,255,.72);font-size:17px}
.who{display:flex;align-items:center;gap:12px}
.who img{width:48px;height:48px;border-radius:50%;object-fit:cover;box-shadow:0 0 0 2px var(--lime-web)}
.who b{display:block;font-size:16px;line-height:1.3;font-weight:600}
.who span{font-size:14px;color:rgba(255,255,255,.62)}
.ck{list-style:none;display:grid;gap:10px;margin-top:22px}
.ck li{position:relative;padding-left:32px;font-size:15px;color:rgba(255,255,255,.88);line-height:1.45}
.ck li::before{content:"";position:absolute;left:0;top:-1px;width:22px;height:22px;border-radius:50%;background:var(--lime) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230A0A0A' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12.5 4 4 8-9'/%3E%3C/svg%3E") no-repeat center/13px}

/* Tấm trắng kiểu app, bo góc lớn đè lên phần tối */
.sheet{position:relative;margin-top:-32px;background:#fff;border-radius:32px 32px 0 0;padding:8px 20px 56px}
.sheet>section{width:min(560px,100%);margin:0 auto}
.sheet>section>h2{margin-top:28px}
.lead{margin-top:10px;color:var(--muted)}

fieldset{border:0;margin-top:28px;min-width:0}
legend{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:-.01em;color:var(--ink);margin-bottom:14px}
legend .n{flex:none;width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--lime-web);font-size:14px;display:grid;place-items:center}
.modes{display:grid;gap:10px}
.opt{position:relative;display:block;padding:16px 18px 16px 54px;border-radius:24px;background:var(--card);cursor:pointer;line-height:1.35;transition:box-shadow .15s,background .15s}
.opt b{color:var(--ink);font-weight:600}
.opt input{position:absolute;left:18px;top:17px;width:22px;height:22px;margin:0;-webkit-appearance:none;appearance:none;border-radius:50%;border:2px solid #CFCFD2;background:#fff;cursor:pointer}
.opt input:checked{border:0;background:var(--lime) radial-gradient(circle,var(--ink) 0 4px,transparent 4.5px)}
.opt small{display:block;color:var(--muted);font-size:14px;margin-top:3px}
.opt:has(input:checked){background:#fff;box-shadow:inset 0 0 0 2px var(--ink)}

.days{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 6px;margin:0 -2px;scrollbar-width:none}
.days::-webkit-scrollbar{display:none}
.day{flex:none;min-width:66px;padding:10px 10px;border:0;border-radius:20px;background:var(--grey);text-align:center;line-height:1.25;cursor:pointer;transition:background .15s}
.day b{display:block;font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.02em}
.day span{font-size:17px;font-weight:700;color:var(--ink)}
.day[aria-checked=true]{background:var(--ink)}
.day[aria-checked=true] b{color:var(--lime-web)}
.day[aria-checked=true] span{color:#fff}
.slots{display:grid;grid-template-columns:repeat(auto-fill,minmax(78px,1fr));gap:8px;margin-top:14px}
.slot{padding:11px 0;border:0;border-radius:16px;background:var(--grey);color:var(--ink);font-weight:600;font-size:16px;font-variant-numeric:tabular-nums;cursor:pointer;transition:background .15s}
@media(hover:hover){.slot:not([aria-checked=true]):hover,.day:not([aria-checked=true]):hover{background:#E7E7E3}}
.slot[aria-checked=true]{background:var(--lime);color:#000;font-weight:700}
.slots .grp{grid-column:1/-1;font-size:12px;font-weight:600;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-top:6px}

.f{display:block;font-size:15px;font-weight:600;color:var(--ink);margin-top:14px}
.f i{font-style:normal;font-weight:400;color:var(--muted)}
.f input,.f textarea,.f select{display:block;width:100%;margin-top:6px;padding:15px 16px;border:0;border-radius:18px;background:var(--grey);color:var(--ink);font-size:17px;font-weight:400;resize:vertical;transition:box-shadow .15s,background .15s}
.f input::placeholder,.f textarea::placeholder{color:#9A9AA0}
.f input:focus,.f textarea:focus,.f select:focus{outline:none;background:#fff;box-shadow:inset 0 0 0 2px var(--ink)}
.f select{-webkit-appearance:none;appearance:none;padding-right:44px;text-overflow:ellipsis;background:var(--grey) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%230A0A0A' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 16px center}
.f select:focus{background-color:#fff}
.f select.empty{color:#9A9AA0}
.trap{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

.btn{display:flex;align-items:center;justify-content:center;width:100%;min-height:58px;margin-top:26px;padding:14px 22px;border:0;border-radius:22px;background:var(--lime);color:#000;font-weight:600;font-size:17px;line-height:1.3;text-align:center;text-decoration:none;cursor:pointer;transition:transform .1s,filter .15s}
@media(hover:hover){.btn:not(:disabled):not(.ghost):hover{filter:brightness(.97)}}
.btn:not(:disabled):active{transform:scale(.985)}
.btn:disabled{background:var(--grey);color:#9A9AA0;cursor:not-allowed}
.btn.ghost{background:var(--grey);color:var(--ink)}
.acts{margin-top:8px}
.acts .btn{margin-top:12px}
.small{font-size:14px;color:var(--muted);margin-top:12px}
.center{text-align:center}
.err{margin-top:18px;padding:14px 16px;border-radius:18px;background:#FFF1EC;color:#9A3412;font-size:15px}
.tick{width:64px;height:64px;margin-top:28px;border-radius:50%;background:var(--lime);color:#000;display:grid;place-items:center;font-size:30px;font-weight:700;animation:pop .45s cubic-bezier(.2,1.4,.4,1)}
@keyframes pop{from{transform:scale(.4);opacity:0}}
#done h2{margin-top:18px}
#done .lead{color:var(--ink);font-size:18px;font-weight:500}
.skel{height:44px;border-radius:16px;background:linear-gradient(90deg,var(--grey),#E9E9E9,var(--grey));background-size:200% 100%;animation:sk 1.2s infinite}
@keyframes sk{to{background-position:-200% 0}}
@media(prefers-reduced-motion:reduce){.skel,.tick{animation:none}}
.inv-when{margin-top:22px;padding:20px 22px;border-radius:24px;background:var(--ink);color:#fff}
.inv-when b{display:block;font-size:26px;line-height:1.2;letter-spacing:-.02em;color:var(--lime-web)}
.inv-when span{display:block;margin-top:6px;color:rgba(255,255,255,.7);font-size:15px}

/* Desktop: cột trái tối đứng yên, cột phải là form */
@media(min-width:960px){
  body{background:var(--dark)}
  .page{display:grid;grid-template-columns:minmax(380px,42%) 1fr;min-height:100dvh}
  .intro{position:sticky;top:0;height:100dvh;display:flex;align-items:center;padding:48px clamp(40px,5vw,80px)}
  .intro::before{width:760px;height:760px;right:-320px;top:-340px}
  .intro-in{width:100%;max-width:460px;margin:0 0 0 auto}
  .intro h1{margin-top:40px;font-size:clamp(48px,4.6vw,64px)}
  .intro .lead{font-size:19px}
  .ck{margin-top:32px;gap:14px}
  .ck li{font-size:16px}
  .sheet{margin:16px 16px 16px 0;border-radius:32px;padding:24px clamp(32px,5vw,72px) 56px}
  .sheet>section{margin:0}
  .modes{grid-template-columns:1fr 1fr}
  .days{flex-wrap:wrap;overflow:visible}
  .acts{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  .acts .btn{margin-top:12px}
  .acts .btn:only-child{grid-column:1/-1}
  #done .acts .btn:first-child:not([hidden]){grid-column:1/-1}
}