:root {
    --bg: #0d0f14;
    --panel: #161a23;
    --panel-2: #1d222e;
    --border: #272d3a;
    --text: #e6e9ef;
    --muted: #8b93a7;
    --accent: #7c5cff;
    --accent-2: #22d3ee;
    --good: #34d399;
    --warn: #fbbf24;
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background:
        radial-gradient(900px 500px at 15% -10%, rgba(124,92,255,.18), transparent 60%),
        radial-gradient(800px 500px at 100% 0%, rgba(34,211,238,.12), transparent 55%),
        var(--bg);
    color: var(--text);
    font: 15px/1.6 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- top bar ---- */
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    gap: 1rem; flex-wrap: wrap;
    padding: .85rem 1.5rem;
    background: rgba(13,15,20,.75);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.brand span { color: var(--accent); }
.topbar nav { display: flex; gap: .35rem; flex-wrap: wrap; }
.topbar nav a {
    color: var(--muted); padding: .35rem .75rem; border-radius: 8px; font-weight: 500;
}
.topbar nav a:hover { background: var(--panel); color: var(--text); text-decoration: none; }
.topbar nav a.active { background: var(--accent); color: #fff; }

/* ---- layout ---- */
.wrap { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.hero { text-align: center; padding: 2.5rem 0 1rem; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 0 0 .5rem; line-height: 1.1; }
.hero h1 .grad {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--muted); max-width: 620px; margin: 0 auto; font-size: 1.05rem; }

h2 { margin: 2.5rem 0 1rem; font-size: 1.4rem; display: flex; align-items: baseline; gap: .6rem; }
h2 .tag { font: 600 .65rem/1 var(--mono); color: var(--accent); border: 1px solid var(--border);
    padding: .3rem .5rem; border-radius: 6px; letter-spacing: .05em; text-transform: uppercase; }
h3 { margin: 1.4rem 0 .6rem; font-size: 1.05rem; }
.lead { color: var(--muted); margin-top: -.5rem; }

/* ---- cards ---- */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
    background: linear-gradient(180deg, var(--panel), var(--panel-2));
    border: 1px solid var(--border); border-radius: 14px; padding: 1.25rem;
}
.card.link { transition: transform .12s ease, border-color .12s ease; }
.card.link:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card h3 { margin-top: 0; }
.card .big { font: 700 2rem/1 var(--mono); color: var(--accent-2); }
.card p { color: var(--muted); margin: .4rem 0 0; }
.card .icon { font-size: 1.6rem; }

/* ---- panels / figures ---- */
.panel {
    background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
    padding: 1.25rem 1.4rem; margin: 1rem 0;
}
figure { margin: 1rem 0; }
figure img { max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border);
    display: block; background: #000; }
figure svg { max-width: 100%; height: auto; }
figcaption { color: var(--muted); font-size: .85rem; margin-top: .5rem; }

/* ---- code + values ---- */
code, pre, .mono { font-family: var(--mono); }
pre {
    background: #0b0d12; border: 1px solid var(--border); border-radius: 10px;
    padding: 1rem; overflow-x: auto; font-size: .85rem; color: #d7dce6; line-height: 1.5;
}
code.inline { background: #0b0d12; border: 1px solid var(--border); padding: .1rem .4rem;
    border-radius: 5px; font-size: .85em; }
.bignum { font-family: var(--mono); word-break: break-all; color: var(--good);
    background: #0b0d12; border: 1px solid var(--border); border-radius: 8px;
    padding: .75rem; display: block; font-size: .8rem; }

/* ---- tables ---- */
.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .75rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: .72rem; letter-spacing: .04em; }
td.mono, th.mono { font-family: var(--mono); }
tr:hover td { background: rgba(124,92,255,.06); }
.bar { height: 8px; border-radius: 4px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }

/* ---- forms ---- */
form.controls { display: flex; gap: .75rem; align-items: flex-end; flex-wrap: wrap; margin: 1rem 0; }
label { display: block; font-size: .8rem; color: var(--muted); margin-bottom: .3rem; }
input[type=number], input[type=text], textarea, select {
    background: #0b0d12; border: 1px solid var(--border); color: var(--text);
    border-radius: 8px; padding: .55rem .7rem; font: inherit; width: 100%;
}
textarea { min-height: 140px; resize: vertical; font-family: var(--mono); font-size: .9rem; }
button {
    background: var(--accent); color: #fff; border: 0; border-radius: 8px;
    padding: .6rem 1.2rem; font: 600 .95rem system-ui; cursor: pointer;
}
button:hover { filter: brightness(1.1); }
.hl { background: rgba(251,191,36,.25); border-radius: 3px; padding: 0 .15em;
    outline: 1px solid rgba(251,191,36,.4); }

/* ---- misc ---- */
.pill { display: inline-block; font: 600 .72rem/1 var(--mono); padding: .35rem .55rem;
    border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }
.pill.on { color: var(--good); border-color: rgba(52,211,153,.4); }
.split { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.clock { font: 700 1.5rem var(--mono); color: var(--accent-2); }
.foot {
    max-width: 1100px; margin: 0 auto; padding: 1.5rem; color: var(--muted);
    font-size: .82rem; border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}