:root{color-scheme:dark;--bg:#0d1726;--card:#15233a;--ink:#e8eef7;--mute:#9aabc2;--line:#26374f;--alt:#101d31;--deep:#08111d;--on-amber:#10233f;--amber:#f2a33a;--amber-d:#b8710f;--teal:#3fc1c1;--code:#08111d;--r:14px}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Be Vietnam Pro",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
a{color:inherit}
:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
section{padding:72px 0}
h1,h2,h3{line-height:1.2;font-weight:800;letter-spacing:-.02em}
h1{font-size:clamp(2.4rem,6vw,4rem)}
h2{font-size:clamp(1.6rem,3.5vw,2.3rem);margin-bottom:12px}
.lead{color:var(--mute);font-size:1.1rem;max-width:60ch}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:12px;font-weight:600;text-decoration:none;border:2px solid var(--ink);transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn.primary{background:var(--amber);border-color:var(--amber);color:var(--on-amber);box-shadow:0 6px 0 var(--amber-d)}
.btn.primary:active{transform:translateY(4px);box-shadow:0 2px 0 var(--amber-d)}
.btn.ghost{background:transparent}
header{position:sticky;top:0;z-index:10;background:rgba(13,23,38,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;text-decoration:none;font-size:1.1rem}
nav{display:flex;gap:22px;align-items:center}
nav a{text-decoration:none;color:var(--mute);font-weight:500;font-size:.95rem}
nav a:hover{color:var(--ink)}
nav .btn:hover{color:var(--on-amber)}
nav .btn{padding:8px 16px;color:var(--on-amber);box-shadow:none;font-size:.9rem}
@media(max-width:760px){nav a:not(.btn){display:none}}
.hero{padding:64px 0 48px}
.hero .grid{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
@media(max-width:860px){.hero .grid{grid-template-columns:1fr}}
.hero p{margin:18px 0 28px}
.cta{display:flex;gap:14px;flex-wrap:wrap}
.meta{margin-top:18px;color:var(--mute);font-size:.9rem}
/* demo */
.demo{background:var(--card);border:2px solid var(--amber);border-radius:20px;padding:22px;box-shadow:8px 8px 0 rgba(242,163,58,.25)}
.demo h3{font-size:1.05rem}
.demo small{color:var(--mute)}
.items{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0}
.item{border:2px solid var(--line);border-radius:12px;background:var(--bg);padding:10px 6px;text-align:center;cursor:pointer;font:inherit;color:inherit;transition:.15s}
.item:hover{border-color:var(--teal)}
.item .e{font-size:1.8rem;display:block}
.item b{font-size:.78rem;font-weight:600}
.item span{display:block;font-size:.75rem;color:var(--mute)}
.item.in{background:rgba(242,163,58,.16);border-color:var(--amber)}
.bar{height:14px;background:var(--line);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--teal);transition:width .3s,background .3s}
.bar.over i{background:#ef6a6a}
.stats{display:flex;justify-content:space-between;margin-top:10px;font-weight:600;font-size:.95rem}
#msg{margin-top:8px;font-size:.88rem;color:var(--mute);min-height:1.4em}
/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin-top:32px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card .ic{font-size:1.8rem}
.card h3{font-size:1.1rem;margin:10px 0 6px}
.card p{color:var(--mute);font-size:.95rem}
.steps{list-style:none;padding:0;counter-reset:s;display:grid;gap:14px;margin-top:28px;max-width:720px}
.steps li{counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px 18px 66px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:18px;top:50%;transform:translateY(-50%);width:34px;height:34px;border-radius:50%;background:var(--amber);color:var(--on-amber);display:grid;place-items:center;font-weight:800}
.alt{background:var(--alt)}
table{width:100%;border-collapse:collapse;background:var(--card);border-radius:var(--r);overflow:hidden;margin-top:24px}
td,th{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line)}
th{width:34%;color:var(--mute);font-weight:600}
tr:last-child td,tr:last-child th{border:0}
/* download */
.dl{background:var(--deep);border:1px solid var(--line);color:#fff;border-radius:24px;padding:48px 32px;text-align:center}
.dl p{color:#b8c6da;margin:10px auto 26px;max-width:52ch}
.dl .meta{color:#b8c6da}
/* source viewer */
.viewer{margin-top:28px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.vhead{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:12px 16px;border-bottom:1px solid var(--line);font-size:.9rem}
.vhead code{background:var(--bg);padding:3px 8px;border-radius:6px;word-break:break-all}
.vbody{display:grid;grid-template-columns:260px 1fr;min-height:360px}
@media(max-width:760px){.vbody{grid-template-columns:1fr}}
#tree{border-right:1px solid var(--line);max-height:520px;overflow:auto;padding:8px}
#tree button{display:block;width:100%;text-align:left;background:none;border:0;padding:7px 10px;border-radius:8px;font:inherit;font-size:.88rem;cursor:pointer;color:inherit}
#tree button:hover{background:var(--bg)}
#tree button.act{background:rgba(242,163,58,.16)}
pre{background:var(--code);color:#e6edf7;padding:18px;overflow:auto;max-height:520px;font:.82rem/1.6 ui-monospace,Consolas,monospace;tab-size:4;height:100%}
details{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 20px;margin-top:12px}
summary{cursor:pointer;font-weight:600}
details p{margin-top:10px;color:var(--mute)}
footer{background:var(--deep);border-top:1px solid var(--line);color:#b8c6da;padding:44px 0 28px;font-size:.92rem}
footer .cols{display:flex;gap:40px;flex-wrap:wrap;justify-content:space-between}
footer h4{color:#fff;margin-bottom:8px}
footer a{display:block;text-decoration:none;padding:2px 0}
footer a:hover{color:#fff}
footer .copy{border-top:1px solid #2a3f5f;margin-top:28px;padding-top:18px;text-align:center}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}