/* Reuse the Khadas palette and HarmonyOS typography from tokens.css. */
:root{color-scheme:light;--bg:#fff;--text:var(--ink);--muted:var(--grey);--control:var(--tint-2);--accent:var(--blue-700)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);line-height:1.5}
a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}button,input,textarea{font:inherit}button,a,input,textarea{touch-action:manipulation}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.skip{position:absolute;top:-100px;background:var(--bg);padding:12px;z-index:2}.skip:focus{top:0}
.preview-note{background:var(--tint);color:var(--navy);font-size:12px;text-align:center;padding:9px 20px}
.header{max-width:1440px;margin:auto;min-height:90px;display:flex;align-items:center;justify-content:space-between;padding:16px 56px;gap:24px}
.logo{width:132px;height:auto;display:block}.header nav{display:flex;gap:32px;font-size:14px}.header nav a:last-child{color:var(--accent)}
.header>a,.header nav a,footer a,.text-link{min-height:44px;display:inline-flex;align-items:center}
main{max-width:1440px;margin:auto;padding:0 56px}
.challenge{position:relative;overflow:hidden;border-radius:24px;background:linear-gradient(128deg,#071c5c 0%,#174fc7 50%,#46a8ff 100%);color:#fff}
.challenge::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 78% 32%,rgba(255,255,255,.24),transparent 28%),linear-gradient(115deg,transparent 47%,rgba(255,255,255,.1));pointer-events:none}
.invitation{position:relative;display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:28px;min-height:650px;padding:64px}
h1{font-size:clamp(52px,6vw,86px);line-height:1.02;letter-spacing:-.04em;margin:0 0 22px;font-weight:700}
h1 span{color:#fff}
.tagline{font-size:clamp(23px,2.2vw,30px);font-weight:700;letter-spacing:-.025em;margin:0 0 16px}
.intro{max-width:500px;font-size:18px;line-height:1.6;color:#e4efff;margin:0 0 28px}
.hero-action{display:inline-flex;align-items:center;justify-content:space-between;gap:36px;min-height:54px;padding:15px 24px;background:#fff;border-radius:var(--r-sm);color:var(--navy);font-weight:700;box-shadow:0 14px 34px rgba(2,20,73,.24)}.hero-action:hover{background:#ddecff;text-decoration:none}
.prize-note{max-width:420px;font-size:12px;line-height:1.55;color:#d5e6ff;margin:16px 0 0}
figure{margin:0;min-width:0}.product-stage{position:relative;padding:26px;border-radius:22px;background:rgba(255,255,255,.9);box-shadow:0 30px 80px rgba(0,25,91,.28);transform:rotate(1.5deg)}.block{display:block;width:100%;max-width:520px;height:auto;margin:auto;filter:brightness(1.1);mix-blend-mode:multiply}.product-stage figcaption{font-size:12px;color:#4b617a;text-align:center;margin-top:8px}
.build-path{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:26px;padding:34px 56px;border-bottom:1px solid var(--line)}.build-path p{margin:0}.build-path strong,.build-path span{display:block}.build-path strong{font-size:18px;margin-bottom:5px}.build-path p span{font-size:14px;color:var(--muted)}.path-arrow{font-size:28px;color:var(--blue-600)}
.participate{display:grid;grid-template-columns:1fr 1.05fr;gap:100px;padding:88px 0 80px;align-items:start}
.how h2,.entry h2{font-size:36px;letter-spacing:-.025em;line-height:1.15;margin:0 0 18px;font-weight:700}
.how>p{font-size:16px;color:var(--muted);max-width:380px;margin:0 0 36px}.how ol{list-style:none;margin:0 0 28px;padding:0;max-width:380px}.how li{padding:22px 0;border-top:1px solid var(--line)}.how li strong{display:block;font-size:19px;margin-bottom:5px}.how li span{display:block;font-size:16px;color:var(--muted)}.text-link{color:var(--accent);gap:16px;font-size:15px;font-weight:700}
.entry{min-width:0;scroll-margin-top:28px}.form-intro{font-size:16px;color:var(--muted);max-width:420px;margin:0 0 32px}
fieldset{border:0;padding:0;margin:0;min-width:0}label,legend{font-size:15px;font-weight:700}label[for]{display:block;margin-bottom:8px}
input[type=email],textarea{width:100%;border:1px solid #a9b6c5;border-radius:var(--r-sm);padding:14px 16px;background:var(--control);color:var(--text);font-size:16px;line-height:1.6}
textarea{resize:vertical;min-height:140px}input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
.helper{font-size:12px;line-height:1.55;color:var(--muted);margin:8px 0 24px}.attachments legend span{font-weight:400;color:var(--muted)}
.choices{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.choices label{position:relative;cursor:pointer}.choices input{position:absolute;opacity:0;width:100%;height:100%;margin:0}
.choices span{display:flex;align-items:center;min-height:44px;padding:10px 12px;border:1px solid #a9b6c5;border-radius:var(--r-sm);font-weight:400;font-size:14px}.choices input:checked+span{background:var(--tint);color:var(--accent);border-color:var(--accent)}.choices input:checked+span::before{content:'✓';margin-right:6px;font-weight:700}
.choices input:focus-visible+span{outline:3px solid var(--accent);outline-offset:3px}.choices label:hover span,input[type=email]:hover,textarea:hover{border-color:var(--accent)}
.consent{display:flex;align-items:flex-start;gap:10px;font-size:12px;font-weight:400;margin:0 0 23px;cursor:pointer}.consent input{accent-color:var(--accent);width:18px;height:18px;flex-shrink:0;margin:2px 0}.consent small{display:block;color:var(--muted);margin-top:4px;font-size:12px}
button{width:100%;border:0;border-radius:var(--r-sm);background:var(--accent);color:var(--white);padding:17px 20px;font-size:16px;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;align-items:center;white-space:nowrap;transition:background-color 180ms ease-out}
button:hover{background:var(--navy)}button:active{background:var(--blue-600)}fieldset:disabled{opacity:.55}fieldset:disabled button{cursor:not-allowed}
.local-only{text-align:center;font-size:12px;color:var(--muted);margin:10px 0 0}
footer{max-width:1328px;margin:0 auto;padding:24px 0 30px;border-top:1px solid var(--line);display:flex;gap:28px;font-size:12px;align-items:center;color:var(--muted)}.footer-brand{font-weight:700;letter-spacing:2px;color:var(--text)}footer p{margin:0}footer nav{margin-left:auto;display:flex;gap:24px}footer nav a{color:var(--accent)}
.sr-only{position:absolute;width:1px;height:1px;clip-path:inset(50%);overflow:hidden}.summary{margin:24px 0;padding:20px;background:var(--tint-2);border-radius:var(--r-sm);overflow-wrap:anywhere}.summary h3{font-size:12px;color:var(--muted);font-weight:400;margin:0 0 8px}.summary p{white-space:pre-wrap;font-size:15px;margin:0 0 20px}.summary p:last-child{margin:0}.confirmation-note{font-size:13px;color:var(--muted);margin-bottom:24px}[hidden]{display:none!important}
@media(max-width:1100px){.header,main{padding-left:32px;padding-right:32px}.header nav{gap:20px}.invitation{min-height:580px;gap:20px}.participate{gap:48px}footer{margin:0 32px;gap:20px}footer nav{gap:16px}.intro{font-size:17px}}
@media(max-width:800px){.header{min-height:80px;padding:12px 24px;flex-wrap:wrap;gap:8px}.header nav{gap:18px;font-size:12px;flex-wrap:wrap}.logo{width:112px}main{padding:0 16px}.challenge{border-radius:18px}.invitation{grid-template-columns:1fr;min-height:0;padding:38px 24px 28px;gap:30px}h1{font-size:clamp(46px,12.5vw,64px);letter-spacing:-.035em}.tagline{font-size:23px}.intro{font-size:16px}.product-stage{padding:16px;transform:none}.block{width:min(100%,400px)}figcaption{margin-top:0}.build-path{grid-template-columns:1fr;padding:30px 8px;gap:18px}.path-arrow{transform:rotate(90deg);justify-self:start}.participate{grid-template-columns:1fr;padding:44px 8px;gap:48px}.how h2,.entry h2{font-size:30px}.how>p,.how ol{max-width:none}.how>p{margin-bottom:24px}.how li{padding:16px 0}.how ol{margin-bottom:10px}footer{margin:0 24px;flex-wrap:wrap;gap:12px}footer nav{width:100%;margin:0;flex-wrap:wrap;gap:24px}.form-intro{margin-bottom:24px}}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:var(--denim-bg);--text:var(--denim-ink);--muted:#b5c3d8;--control:var(--denim-surface);--accent:#94c8ff;--line:#38475c}.preview-note{background:var(--denim-surface);color:#b5d9ff}.logo{filter:brightness(1.4)}.product-stage{background:rgba(255,255,255,.94)}.block{filter:brightness(1.08);mix-blend-mode:multiply}.hero-action,button{color:var(--navy)}.hero-action:hover,button:hover{background:#bbdfff}.choices input:checked+span{background:var(--denim-surface)}.summary{background:var(--denim-surface)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}