/* ==========================================================================
   secondbrain - project site
   One stylesheet for every page. The palette is warm on purpose: amber into
   magenta on a near-black brown, so that this site reads as a sibling of
   aegis without borrowing its cool blue.
   ========================================================================== */

:root {
  --amber-200: #fde3a7;
  --amber-300: #fcd34d;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;

  --magenta-300: #f9a8d4;
  --magenta-400: #f472b6;
  --magenta-500: #ec4899;
  --magenta-600: #db2777;

  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1140px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* --- dark (default) ----------------------------------------------------- */
:root,
:root[data-theme="dark"] {
  --bg: #0b0708;
  --bg-elev: #130d0f;
  --surface: #181012;
  --surface-2: #1f1518;
  --border: #2c1e22;
  --border-strong: #48302f;
  --text: #f6ece8;
  --text-dim: #bda8a2;
  --text-faint: #8b7570;
  --accent: var(--amber-400);
  --accent-2: var(--magenta-500);
  --accent-hover: var(--amber-300);
  --accent-contrast: #1a0f04;
  --glow:
    radial-gradient(52% 58% at 30% 0%, rgba(245, 158, 11, .26) 0%, rgba(11, 7, 8, 0) 68%),
    radial-gradient(48% 56% at 72% 6%, rgba(236, 72, 153, .22) 0%, rgba(11, 7, 8, 0) 70%);
  --code-bg: #120b0d;
  --good: var(--amber-400);
  --bad: #e0685f;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, .85);
}

/* --- light --------------------------------------------------------------- */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #fffdfb;
    --bg-elev: #fdf6f1;
    --surface: #ffffff;
    --surface-2: #fdf2ea;
    --border: #f0e1d7;
    --border-strong: #dcc3b3;
    --text: #1c1113;
    --text-dim: #6c5751;
    --text-faint: #957f79;
    --accent: var(--amber-600);
    --accent-2: var(--magenta-600);
    --accent-hover: var(--amber-700);
    --accent-contrast: #ffffff;
    --glow:
      radial-gradient(52% 58% at 30% 0%, rgba(245, 158, 11, .16) 0%, rgba(255, 253, 251, 0) 68%),
      radial-gradient(48% 56% at 72% 6%, rgba(236, 72, 153, .13) 0%, rgba(255, 253, 251, 0) 70%);
    --code-bg: #120b0d;
    --good: var(--amber-700);
    --bad: #be123c;
    --shadow: 0 20px 50px -24px rgba(90, 40, 20, .26);
  }
}

:root[data-theme="light"] {
  --bg: #fffdfb;
  --bg-elev: #fdf6f1;
  --surface: #ffffff;
  --surface-2: #fdf2ea;
  --border: #f0e1d7;
  --border-strong: #dcc3b3;
  --text: #1c1113;
  --text-dim: #6c5751;
  --text-faint: #957f79;
  --accent: var(--amber-600);
  --accent-2: var(--magenta-600);
  --accent-hover: var(--amber-700);
  --accent-contrast: #ffffff;
  --glow:
    radial-gradient(52% 58% at 30% 0%, rgba(245, 158, 11, .16) 0%, rgba(255, 253, 251, 0) 68%),
    radial-gradient(48% 56% at 72% 6%, rgba(236, 72, 153, .13) 0%, rgba(255, 253, 251, 0) 70%);
  --code-bg: #120b0d;
  --good: var(--amber-700);
  --bad: #be123c;
  --shadow: 0 20px 50px -24px rgba(90, 40, 20, .26);
}

/* --- base ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -.02em; margin: 0 0 .5em; font-weight: 650; }
h1 { font-size: clamp(2.1rem, 5.2vw, 3.6rem); letter-spacing: -.035em; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1rem; }

::selection { background: var(--accent); color: var(--accent-contrast); }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.narrow { max-width: 820px; }

section { padding: 84px 0; }
@media (max-width: 640px) { section { padding: 56px 0; } }

.eyebrow {
  font-size: .74rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .8rem;
}
.lede { font-size: 1.12rem; color: var(--text-dim); max-width: 68ch; }

/* --- header -------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 680; letter-spacing: -.02em; color: var(--text); font-size: 1.05rem; }
.brand:hover { color: var(--text); }
.brand img { width: 30px; height: 30px; object-fit: contain; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  color: var(--text-dim); font-size: .93rem; font-weight: 500;
  padding: 7px 12px; border-radius: 8px; transition: background .15s var(--ease), color .15s var(--ease);
}
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }

.icon-btn {
  display: inline-grid; place-items: center; width: 34px; height: 34px;
  border: 1px solid var(--border); border-radius: 9px;
  background: transparent; color: var(--text-dim); cursor: pointer;
  transition: color .15s var(--ease), border-color .15s var(--ease), background .15s var(--ease);
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface-2); }
.icon-btn svg { width: 17px; height: 17px; }
.theme-toggle .moon { display: none; }
:root[data-theme="light"] .theme-toggle .moon { display: block; }
:root[data-theme="light"] .theme-toggle .sun { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-toggle .moon { display: block; }
  :root:not([data-theme="dark"]) .theme-toggle .sun { display: none; }
}

.nav-toggle { display: none; }
@media (max-width: 800px) {
  .nav {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch;
    gap: 2px; padding: 12px 20px 20px; background: var(--bg);
    border-bottom: 1px solid var(--border); display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 11px 12px; font-size: 1rem; }
  .nav-toggle { display: inline-grid; margin-left: auto; }
  .header-actions { display: flex; gap: 8px; align-items: center; }
}

/* --- hero ---------------------------------------------------------------- */
.hero { position: relative; padding: 92px 0 72px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% 0 auto 0; height: 660px;
  background: var(--glow); pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; text-align: center; }
.hero-logo {
  width: min(190px, 44vw); height: auto; margin: 0 auto 26px; display: block;
  filter: drop-shadow(0 14px 40px rgba(236, 72, 153, .30));
  animation: rise .7s var(--ease) both;
}
.hero h1 { margin-bottom: .35em; animation: rise .7s .05s var(--ease) both; }
.hero .lede { margin-inline: auto; font-size: 1.18rem; animation: rise .7s .1s var(--ease) both; }
.grad {
  background: linear-gradient(100deg, var(--amber-400), var(--amber-500) 34%, var(--magenta-400) 72%, var(--magenta-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 13px 5px 9px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--text-dim);
  font-size: .82rem; font-weight: 500; margin-bottom: 22px;
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 3px color-mix(in srgb, var(--good) 22%, transparent); }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 30px; animation: rise .7s .15s var(--ease) both; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 20px; border-radius: 11px; font-weight: 560; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s var(--ease), background .15s var(--ease), border-color .15s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 17px; height: 17px; }
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-contrast); }
.btn-ghost { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--border-strong); background: var(--surface-2); color: var(--text); }

/* --- neurons -------------------------------------------------------------
   The hero sits on a slow network. Nodes breathe out of phase and a signal
   crosses an edge now and then; nothing moves fast enough to compete with
   the headline for attention.                                              */
.neurons {
  position: absolute; inset: 0; z-index: 1;
  pointer-events: none; overflow: hidden;
  -webkit-mask-image: radial-gradient(76% 76% at 50% 42%, #000 0%, transparent 78%);
  mask-image: radial-gradient(76% 76% at 50% 42%, #000 0%, transparent 78%);
}
.neurons svg { position: absolute; inset: 0; width: 100%; height: 100%; }

.n-edge { stroke: var(--border-strong); stroke-width: 1; fill: none; opacity: .55; }
.n-signal {
  fill: none; stroke-width: 2; stroke-linecap: round;
  stroke-dasharray: 15 1185;
  stroke-dashoffset: 1200;
  animation: n-travel 9s linear infinite;
}
.n-signal-a { stroke: var(--amber-400); }
.n-signal-b { stroke: var(--magenta-400); }
.n-node {
  fill: var(--accent); opacity: .5;
  animation: n-pulse 5.5s ease-in-out infinite;
}
.n-node-b { fill: var(--accent-2); }
.n-halo {
  fill: none; stroke: var(--accent); stroke-width: 1; opacity: 0;
  animation: n-halo 5.5s ease-in-out infinite;
}
.n-halo-b { stroke: var(--accent-2); }

@keyframes n-travel { from { stroke-dashoffset: 1200; } to { stroke-dashoffset: 0; } }
@keyframes n-pulse {
  0%, 100% { opacity: .35; transform: scale(1); }
  50%      { opacity: .95; transform: scale(1.45); }
}
@keyframes n-halo {
  0%, 100% { opacity: 0; transform: scale(.6); }
  40%      { opacity: .32; transform: scale(1); }
  70%      { opacity: 0; transform: scale(1.5); }
}
.n-node, .n-halo { transform-box: fill-box; transform-origin: center; }

:root[data-theme="light"] .neurons,
:root:not([data-theme="dark"]) .neurons { opacity: .85; }

/* --- generic surfaces ---------------------------------------------------- */
.card {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: border-color .18s var(--ease), transform .18s var(--ease);
}
.card::after {
  content: ""; position: absolute; z-index: 0; left: 24px; top: 24px;
  width: 300px; height: 300px; margin: -150px 0 0 -150px; border-radius: 50%;
  background: radial-gradient(closest-side,
      color-mix(in srgb, var(--accent) 26%, transparent) 0%,
      color-mix(in srgb, var(--accent-2) 14%, transparent) 45%,
      transparent 100%);
  opacity: 0; transform: scale(.6); pointer-events: none;
  transition: opacity .4s var(--ease), transform .5s var(--ease);
}
.card > * { position: relative; z-index: 1; }
.card:hover { border-color: var(--border-strong); }
.card:hover::after { opacity: 1; transform: scale(1); }
.card h3 { margin-bottom: .4em; }
.card p { color: var(--text-dim); margin: 0; font-size: .95rem; }
.card .ico {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent); margin-bottom: 14px;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.card .ico svg { width: 20px; height: 20px; }
.card:hover .ico { animation: synapse .62s var(--ease); }
@keyframes synapse {
  0%   { transform: scale(1);    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  45%  { transform: scale(1.14); box-shadow: 0 0 0 9px color-mix(in srgb, var(--accent) 0%, transparent); }
  100% { transform: scale(1);    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 0%, transparent); }
}

.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(268px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

/* --- comparison ---------------------------------------------------------- */
.compare { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.compare > div { border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; background: var(--surface); }
.compare h3 { display: flex; align-items: center; gap: 9px; font-size: 1rem; }
.compare ul { list-style: none; margin: 14px 0 0; padding: 0; }
.compare li { position: relative; padding-left: 26px; margin-bottom: 10px; color: var(--text-dim); font-size: .94rem; }
.compare li::before { position: absolute; left: 0; top: 0; font-weight: 700; }
.without li::before { content: "\2717"; color: var(--bad); }
.with li::before { content: "\2713"; color: var(--good); }
.tag { font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 700; padding: 3px 8px; border-radius: 6px; }
.tag-bad { background: color-mix(in srgb, var(--bad) 16%, transparent); color: var(--bad); }
.tag-good { background: color-mix(in srgb, var(--good) 18%, transparent); color: var(--good); }

/* --- diagram ------------------------------------------------------------- */
.diagram { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 24px; }
.diagram svg { width: 100%; height: auto; display: block; }
.d-box { fill: var(--surface-2); stroke: var(--border-strong); }
.d-box-accent { fill: color-mix(in srgb, var(--accent) 12%, transparent); stroke: var(--accent); }
.d-text { fill: var(--text); font-family: var(--sans); font-size: 13px; font-weight: 600; }
.d-sub { fill: var(--text-faint); font-family: var(--mono); font-size: 10.5px; }
.d-line { stroke: var(--border-strong); stroke-width: 1.6; fill: none; }
.d-line-accent { stroke: var(--accent); stroke-width: 1.8; fill: none; }
.d-label { fill: var(--text-dim); font-family: var(--mono); font-size: 10.5px; }
.d-arrow { fill: var(--border-strong); }
.d-arrow-accent { fill: var(--accent); }
.d-flow {
  fill: none; stroke: var(--accent-2); stroke-width: 2.6; stroke-linecap: round;
  stroke-dasharray: 22 1178; stroke-dashoffset: 1200;
  animation: n-travel 6s linear infinite;
}
.d-flow-2 { stroke: var(--accent); animation-delay: -3s; }

/* --- code ---------------------------------------------------------------- */
.code {
  position: relative; background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.code-head {
  display: flex; align-items: center; gap: 9px; padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .07); background: rgba(255, 255, 255, .03);
}
.code-head .name { font-family: var(--mono); font-size: .78rem; color: #a58c86; }
.dots { display: flex; gap: 6px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #43302f; display: block; }
.dots i:nth-child(1) { background: #e0685f; }
.dots i:nth-child(2) { background: #f59e0b; }
.dots i:nth-child(3) { background: #ec4899; }
.copy {
  margin-left: auto; background: transparent; border: 1px solid rgba(255, 255, 255, .12);
  color: #a58c86; font-size: .74rem; padding: 4px 9px; border-radius: 7px; cursor: pointer;
  font-family: var(--sans); transition: all .15s var(--ease);
}
.copy:hover { color: #f2e3dd; border-color: rgba(255, 255, 255, .28); }
.copy.done { color: var(--amber-400); border-color: var(--amber-400); }

pre {
  margin: 0; padding: 18px; overflow-x: auto;
  font-family: var(--mono); font-size: .845rem; line-height: 1.75; color: #ecdcd6;
  tab-size: 2;
}
pre code { font: inherit; color: inherit; }
:not(pre) > code {
  font-family: var(--mono); font-size: .875em;
  background: var(--surface-2); border: 1px solid var(--border);
  padding: .12em .4em; border-radius: 6px; color: var(--text);
}

/* naive but stable token colouring, applied by site.js */
.t-com { color: #8a6f68; font-style: italic; }
.t-key { color: var(--amber-400); }
.t-str { color: var(--magenta-300); }
.t-num { color: #f5b473; }
.t-fn  { color: var(--magenta-400); }
.t-op  { color: #bda8a2; }

/* --- steps --------------------------------------------------------------- */
.steps { counter-reset: step; display: grid; gap: 20px; }
.step { display: grid; grid-template-columns: 40px 1fr; gap: 18px; align-items: start; }
.step::before {
  counter-increment: step; content: counter(step);
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent);
  font-weight: 700; font-size: .9rem; font-family: var(--mono); margin-top: 2px;
}
.step h3 { margin-bottom: .3em; font-size: 1.02rem; }
.step p { color: var(--text-dim); font-size: .95rem; margin-bottom: .7rem; }

/* --- tables -------------------------------------------------------------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font-weight: 620; font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td:first-child { white-space: nowrap; }
.table-wrap.wrap-first td:first-child { white-space: normal; }

/* --- callouts ------------------------------------------------------------ */
.note {
  border-left: 3px solid var(--accent); background: var(--surface);
  padding: 16px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 22px 0;
  color: var(--text-dim); font-size: .94rem;
}
.note strong { color: var(--text); }
.note.warn { border-left-color: var(--accent-2); }

/* --- tool reference ------------------------------------------------------ */
.tool {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); padding: 18px 20px; margin-bottom: 14px;
}
.tool h4 {
  font-family: var(--mono); font-size: .95rem; font-weight: 620;
  margin: 0 0 .35em; color: var(--text); display: flex; flex-wrap: wrap; align-items: center; gap: 9px;
}
.tool p { color: var(--text-dim); font-size: .93rem; margin: 0 0 .6rem; }
.tool p:last-child { margin-bottom: 0; }
.tool .args { font-family: var(--mono); font-size: .8rem; color: var(--text-faint); }
.tool .args b { color: var(--text-dim); font-weight: 600; }
.badge {
  font-size: .64rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 700;
  padding: 2px 7px; border-radius: 5px; font-family: var(--sans);
}
.badge-read { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }
.badge-write { background: color-mix(in srgb, var(--accent-2) 16%, transparent); color: var(--accent-2); }

/* --- docs layout --------------------------------------------------------- */
.doc-layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: 48px; align-items: start; padding-top: 44px; }
.toc { position: sticky; top: 90px; font-size: .89rem; }
.toc strong { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--text-faint); margin-bottom: 12px; }
.toc a { display: block; padding: 5px 0 5px 13px; color: var(--text-dim); border-left: 2px solid var(--border); }
.toc a:hover { color: var(--text); border-left-color: var(--border-strong); }
.toc a.active { color: var(--accent); border-left-color: var(--accent); }
.doc-body > section { padding: 0 0 52px; scroll-margin-top: 88px; }
.doc-body h2 { padding-bottom: 10px; border-bottom: 1px solid var(--border); }
@media (max-width: 900px) {
  .doc-layout { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
}

/* --- footer -------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); padding: 44px 0 56px; color: var(--text-faint); font-size: .89rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between; }
.site-footer a { color: var(--text-dim); }
.site-footer a:hover { color: var(--accent); }
.foot-links { display: flex; flex-wrap: wrap; gap: 18px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* --- reduced motion ------------------------------------------------------
   Every animation on this site is decoration. If the reader has asked for
   less movement there is nothing here worth arguing about.                 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .n-signal, .d-flow, .n-halo { display: none; }
  .n-node { opacity: .45; }
  .hero-logo, .hero h1, .hero .lede, .cta-row { opacity: 1; transform: none; }
  .card::after { display: none; }
}