/* Shared by every page: theme tokens, type, nav, buttons, footer. Page-specific styles live in each page or page.css. */
:root, :root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0A0B0D; --grid: rgba(255,255,255,0.035); --surface: #0F1114; --surface-2: #121418; --chip: #1A1D23;
  --line: #1C1F25; --border: #23262D; --border-strong: #3A3F49;
  --fg: #F2F3F5; --fg-2: #C3C8D2; --muted: #9BA1AD; --subtle: #7C8392; --dim: #5C6270;
  --mark: #FFB547; --mark-bg: rgba(255,181,71,0.10); --mark-border: rgba(255,181,71,0.45);
  --accent: #C8FF4D; --accent-ink: #C8FF4D; --accent-soft: rgba(200,255,77,0.12); --glow: rgba(200,255,77,0.45);
  --pro-bg: linear-gradient(180deg, rgba(200,255,77,0.07), rgba(200,255,77,0) 60%), #0F1114;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #F5F6F8; --grid: rgba(10,11,13,0.05); --surface: #FFFFFF; --surface-2: #F0F2F5; --chip: #E9ECF0;
  --line: #E3E6EB; --border: #DDE1E7; --border-strong: #B9C0CA;
  --fg: #0A0B0D; --fg-2: #2E333D; --muted: #4F5664; --subtle: #5F6673; --dim: #A0A6B1;
  --mark: #9A5B00; --mark-bg: rgba(154,91,0,0.07); --mark-border: rgba(154,91,0,0.35);
  --accent: #C8FF4D; --accent-ink: #3F6B00; --accent-soft: rgba(63,107,0,0.10); --glow: rgba(200,255,77,0.7);
  --pro-bg: linear-gradient(180deg, rgba(63,107,0,0.06), rgba(63,107,0,0) 60%), #FFFFFF;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 'Inter Tight', system-ui, -apple-system, 'Segoe UI', sans-serif; transition: background-color .3s, color .3s; }
a { color: var(--accent-ink); }
img { max-width: 100%; }
button { font: inherit; }
.mono { font-family: 'JetBrains Mono', ui-monospace, Consolas, monospace; }
.serif { font-family: 'Instrument Serif', Georgia, serif; font-style: italic; font-weight: 400; letter-spacing: -0.01em; }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.gridbg { background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 64px 64px; }
.eyebrow { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 13px; color: var(--accent-ink); }
.muted { color: var(--muted); }
.card { border: 1px solid var(--border); border-radius: 18px; background: var(--surface); }
.icon { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* nav */
header.top { border-bottom: 1px solid var(--line); position: relative; z-index: 2; }
header.top nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-weight: 600; letter-spacing: -0.01em; }
.brand svg { stroke: var(--accent-ink); }
.navlinks { display: flex; align-items: center; gap: 24px; font-size: 14px; flex-wrap: wrap; }
.navlinks a { color: var(--muted); text-decoration: none; }
.navlinks a:hover, .navlinks a[aria-current="page"] { color: var(--fg); }
.iconbtn { width: 44px; height: 44px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--fg); display: inline-flex; align-items: center; justify-content: center; cursor: pointer; }
[data-theme="dark"] .only-light, [data-theme="light"] .only-dark { display: none !important; }
@media (max-width: 720px) { .navlinks a.hide-sm { display: none; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 0 24px; border-radius: 12px; font-weight: 600; font-size: 16px; cursor: pointer; text-decoration: none; border: 0; }
.btn-accent { background: var(--accent); color: #0A0B0D; }
.btn-ghost { background: transparent; color: var(--fg); border: 1px solid var(--border-strong); }
.btn:focus-visible, .iconbtn:focus-visible, .tab:focus-visible { outline: 2px solid var(--accent-ink); outline-offset: 2px; }

/* footer */
footer.site { border-top: 1px solid var(--line); }
footer.site .wrap { padding-top: 32px; padding-bottom: 32px; display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; font-size: 14px; color: var(--subtle); }
footer.site nav { display: flex; gap: 24px; flex-wrap: wrap; }
footer.site nav a { color: var(--muted); }

@media (max-width: 720px) { .wrap { padding: 0 16px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }