:root{--bg:#070b08;--panel:#0e1610;--line:#1e3324;--fg:#d8f5de;--mute:#8fb39a;--accent:#2bff88;--accent-ink:#04120a}
@media (prefers-color-scheme:light){:root{--bg:#f4faf5;--panel:#fff;--line:#c9e2d0;--fg:#0d2216;--mute:#4f6f5a;--accent:#0a9a4a;--accent-ink:#fff}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--accent)}
.nav{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{font:700 1.05rem ui-monospace,monospace;color:var(--accent);text-decoration:none}
.brand span{color:var(--mute);font-weight:400}
.nav nav{display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.nav nav a{color:var(--fg);text-decoration:none;font-size:.95rem}
.nav nav a.ext{color:var(--accent)}
.lang{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.lang-btn{background:transparent;color:var(--fg);border:0;padding:5px 10px;font:600 .8rem ui-monospace,monospace;cursor:pointer}
.lang-btn[aria-pressed=true]{background:var(--accent);color:var(--accent-ink)}
.lang-btn:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.hero{position:relative;overflow:hidden;min-height:78vh;display:grid;place-items:center;padding:48px 16px;border-bottom:1px solid var(--line)}
#rain{position:absolute;inset:0;width:100%;height:100%;opacity:.28}
.hero-inner{position:relative;max-width:760px;text-align:center}
.eyebrow{font:.8rem ui-monospace,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0}
h1{font-size:clamp(2rem,6vw,3.4rem);line-height:1.1;margin:.4em 0}
h1 em{color:var(--accent);font-style:normal}
.lead{color:var(--mute);font-size:1.1rem}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);border:1px solid var(--accent);padding:11px 20px;border-radius:8px;font:600 1rem inherit;cursor:pointer;text-decoration:none}
.btn.ghost{background:transparent;color:var(--accent)}
.btn.small{padding:8px 14px;font-size:.9rem}
.btn:focus-visible,input:focus-visible,select:focus-visible,.tab:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.section{max-width:960px;margin:0 auto;padding:56px 16px}
h2{font-size:1.7rem;margin:0 0 12px}
.hint{color:var(--mute);font-size:.92rem}
.tabs{display:flex;gap:8px;margin:16px 0;flex-wrap:wrap}
.tab{background:var(--panel);color:var(--fg);border:1px solid var(--line);padding:9px 16px;border-radius:8px;cursor:pointer;font:inherit}
.tab.active{border-color:var(--accent);color:var(--accent)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}
.scroll{overflow-x:auto}
table{border-collapse:collapse;width:100%;min-width:520px}
th,td{border:1px solid var(--line);padding:6px;text-align:center}
td input,th input{width:100%;min-width:64px}
input,select{background:var(--bg);color:var(--fg);border:1px solid var(--line);border-radius:6px;padding:8px;font:inherit}
input[type=number]{text-align:center}
.row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.row input{flex:1;min-width:180px}
.result{margin-top:14px;padding:12px;border-left:3px solid var(--accent);background:var(--bg)}
.grid4{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.quad{border:1px solid var(--line);border-radius:10px;padding:10px;min-height:120px;background:var(--bg)}
.quad h3{margin:0 0 6px;font-size:.9rem;color:var(--accent)}
.quad ul{margin:0;padding:0;list-style:none}
.quad li{display:flex;justify-content:space-between;gap:8px;padding:3px 0;font-size:.92rem}
.quad button{background:none;border:0;color:var(--mute);cursor:pointer;font-size:1rem}
@media(max-width:560px){.grid4{grid-template-columns:1fr}}
.chat{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:12px;min-height:200px;max-height:420px;overflow-y:auto;display:flex;flex-direction:column;gap:10px}
.msg{max-width:85%;padding:9px 12px;border-radius:10px;white-space:pre-wrap}
.msg.ai{background:var(--bg);border:1px solid var(--line);align-self:flex-start}
.msg.me{background:var(--accent);color:var(--accent-ink);align-self:flex-end}
.settings{margin-top:14px}
.settings input{width:100%}
code{font-family:ui-monospace,monospace}
.foot{text-align:center;color:var(--mute);padding:28px 16px;border-top:1px solid var(--line);font-size:.85rem}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}