:root{--bg:#0b0b0c;--fg:#e9eef2;--muted:#9aa3ab;--card:#101115;--b:#1b2026;--link:#9ad8ff;--linkh:#c7ecff;--acc:#3fb0ff;color-scheme:dark light}
*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font:16px/1.6 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Helvetica Neue,Arial,Noto Sans,sans-serif}
a{color:var(--link);text-decoration:none}a:hover{color:var(--linkh);text-decoration:underline}
.container{max-width:1000px;margin:0 auto;padding:20px}
.header{display:flex;gap:12px;align-items:center;justify-content:space-between;margin:6px 0 10px}
.brand{font-weight:800;font-size:20px;letter-spacing:.2px}
.badge{display:inline-block;padding:2px 8px;border:1px solid #253044;border-radius:999px;font-size:11px;background:#0f1420;color:#cbd5e1;margin-left:6px}
.nav a{margin-left:12px}
.theme-toggle{border:1px solid #2a3344;border-radius:10px;padding:6px 10px;cursor:pointer;background:linear-gradient(180deg,#111827,#0b1220);color:var(--fg)}
.theme-toggle:focus-visible{outline:2px solid var(--acc);outline-offset:2px;border-radius:8px}
h1,h2,h3{line-height:1.25;margin:0 0 10px}
.small{color:var(--muted);font-size:14px}
.card{background:var(--card);border:1px solid var(--b);border-radius:12px;padding:14px;margin:12px 0;box-shadow:0 8px 24px rgba(0,0,0,.22)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
hr{border:none;border-top:1px solid #1e2533;margin:18px 0}
pre,code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,Monaco,monospace;font-size:13px}
pre{background:#0d0f12;border:1px solid #1d2330;border-radius:10px;padding:12px;overflow:auto;white-space:pre-wrap;word-break:break-word}
.row{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:900px){.row{grid-template-columns:1fr 1fr}}
.panel{background:#0d0f12;border:1px dashed #263043;border-radius:12px;padding:12px}
.iframe{width:100%;min-height:320px;border:1px solid #223047;border-radius:10px;background:#0b0f15}
.btn{display:inline-block;border:1px solid #2a3344;background:linear-gradient(180deg,#111827,#0b1220);padding:8px 12px;border-radius:10px;font-weight:600;color:var(--fg)}
.btn:hover{text-decoration:none;border-color:#3a4a66}
label{display:block;margin:8px 0 4px}
input[type=text], input[type=number]{width:100%;max-width:520px;padding:8px;border-radius:8px;border:1px solid #2a3344;background:#0b0f15;color:var(--fg)}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px;border-radius:6px}
.footer{margin-top:20px;color:var(--muted);font-size:14px}
/* Light theme overrides */
[data-theme="light"]{--bg:#f8fafc;--fg:#0b0b0c;--muted:#536070;--card:#ffffff;--b:#e6ebf2;--link:#0b5cab;--linkh:#0a4a89;--acc:#2563eb}
[data-theme="light"] .card{box-shadow:0 1px 0 rgba(0,0,0,.03) inset, 0 8px 24px rgba(0,0,0,.06)}
[data-theme="light"] .panel{background:#f4f7fb;border-color:#d9e2ec}
[data-theme="light"] pre{background:#f6f8fb;border-color:#e1e7ef}
[data-theme="light"] .btn{background:#ffffff;border-color:#cfd9e6;color:#0b0b0c}
[data-theme="light"] input[type=text], [data-theme="light"] input[type=number]{background:#ffffff;color:#0b0b0c;border-color:#cfd9e6}