@tailwind base;
@tailwind components;
@tailwind utilities;

/* ---------- root tokens — DeepSeek-aligned ---------- */
:root {
  --paper: #ffffff;
  --paper-deep: #f4f6fb;
  --paper-edge: #e5e8f0;
  --paper-line: #0e0e10;
  --paper-line-soft: #d4d8e2;
  --ink: #0e0e10;
  --ink-soft: #2e2e33;
  --ink-mute: #6b7280;
  --indigo: #4d6bfe;
  --indigo-deep: #3a52cc;
  --indigo-pale: #e9eefe;
  --ochre: #9c7a3f;
  --jade: #0ab68b;
  --cobalt: #1f3a8a;
}

/* ---------- base ---------- */
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  max-width: 100%;
  overflow-x: clip;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body), "IBM Plex Sans", "Noto Sans SC", system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11", "tnum";
  max-width: 100%;
  overflow-x: clip;
  position: relative;
}

/* faint vertical column rule — desktop only, printed-almanac feel.
   Hidden on phones because it slices visibly through narrow content. */
@media (min-width: 1024px) {
  body::after {
    content: "";
    position: fixed;
    inset: 0;
    background-image: linear-gradient(
      to right,
      transparent 0,
      transparent calc(50% - 0.5px),
      rgba(14,14,16,0.04) calc(50% - 0.5px),
      rgba(14,14,16,0.04) calc(50% + 0.5px),
      transparent calc(50% + 0.5px)
    );
    pointer-events: none;
    z-index: 0;
  }
}

main, header, footer, nav { position: relative; z-index: 1; }

/* ---------- type ---------- */
.font-display { font-family: var(--font-display), "Fraunces", "Noto Serif SC", Georgia, serif; }
.font-cjk { font-family: "Noto Serif SC", "Source Han Serif SC", serif; }

/* CJK paragraph rhythm — looser leading, wider tracking for body; tighter for headings */
.cjk-body {
  line-height: 1.9;
  letter-spacing: 0.02em;
  word-break: break-all;
}
.cjk-heading {
  letter-spacing: -0.01em;
}
.cjk-prose p {
  line-height: 1.9;
  letter-spacing: 0.02em;
}
/* Full-width punctuation should use CJK spacing */
.cjk-prose {
  font-feature-settings: "halt", "pwid";
}
.font-mono { font-family: var(--font-mono), "JetBrains Mono", ui-monospace, monospace; }

h1, h2, h3, h4 {
  font-family: var(--font-display), "Fraunces", "Noto Serif SC", Georgia, serif;
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--ink);
}

h1 { font-size: clamp(2.1rem, 5vw, 4.2rem); line-height: 1; word-break: keep-all; overflow-wrap: anywhere; }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.4rem); line-height: 1.1; word-break: keep-all; overflow-wrap: anywhere; }
h3 { font-size: 1.18rem; line-height: 1.25; }

@media (max-width: 640px) {
  h1 .font-cjk {
    display: inline-block;
    font-size: clamp(1.6rem, 7.5vw, 2.2rem);
    overflow-wrap: anywhere;
  }
  /* prevent latin/CJK heading from blowing past the viewport */
  h1, h2 { hyphens: auto; }
}

/* ---------- structural primitives ---------- */
/* Hairlines stay charcoal but softened with a touch of opacity so a pure-white
   background doesn't read as harsh black-on-white office stationery. */
.hairline { border-color: rgba(14,14,16,0.18); }
.hairline-t { border-top: 1px solid rgba(14,14,16,0.18); }
.hairline-b { border-bottom: 1px solid rgba(14,14,16,0.18); }
.hairline-l { border-left: 1px solid rgba(14,14,16,0.18); }
.hairline-r { border-right: 1px solid rgba(14,14,16,0.18); }

.double-rule {
  background-image:
    linear-gradient(rgba(14,14,16,0.18), rgba(14,14,16,0.18)),
    linear-gradient(rgba(14,14,16,0.18), rgba(14,14,16,0.18));
  background-size: 100% 1px, 100% 1px;
  background-position: top, bottom;
  background-repeat: no-repeat;
  padding: 0.45rem 0;
}

.col-rule > * + * {
  border-left: 1px solid rgba(14,14,16,0.18);
}
/* Single-column phones: drop the column rules so cards stack flush. */
@media (max-width: 767px) {
  .col-rule > * + * { border-left: 0; border-top: 1px solid rgba(14,14,16,0.18); }
}

/* small-caps eyebrow */
.eyebrow {
  font-family: var(--font-mono), "JetBrains Mono", monospace;
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ---------- the seal — ink-stamped, not vermillion ---------- */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--paper);
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 1px;
  letter-spacing: -0.04em;
  box-shadow:
     inset 0 0 0 1px rgba(255,255,255,0.18),
     inset 0 0 0 3px var(--ink);
  transform: rotate(-1.5deg);
  position: relative;
}
.seal::after {
  content: "";
  position: absolute;
  inset: -1px;
  background:
    radial-gradient(rgba(255,255,255,0.35) 1px, transparent 1px) 0 0 / 4px 4px;
  mix-blend-mode: screen;
  border-radius: 1px;
  pointer-events: none;
}

/* indigo-stamped variant — used sparingly for the brand mark / featured anchor */
.seal-indigo {
  background: var(--indigo);
  box-shadow:
     inset 0 0 0 1px rgba(255,255,255,0.22),
     inset 0 0 0 3px var(--indigo);
}

/* ---------- pills / status ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.12rem 0.45rem;
  font-family: var(--font-mono), monospace;
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--paper-line);
  background: var(--paper);
  color: var(--ink);
}
.pill-hot { background: var(--indigo); color: var(--paper); border-color: var(--indigo); }
.pill-new { background: var(--paper); color: var(--ink); border-color: var(--ink); }
.pill-jade { background: var(--jade); color: var(--paper); border-color: var(--jade); }
.pill-ochre { background: var(--ochre); color: var(--paper); border-color: var(--ochre); }
.pill-ghost { background: transparent; color: var(--ink-mute); border-color: var(--ink-mute); }

/* ---------- numbers ---------- */
.tabular { font-variant-numeric: tabular-nums; }
.bignum {
  font-family: var(--font-display), "Fraunces", serif;
  font-weight: 600;
  font-size: 2.2rem;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}

/* ---------- code blocks ---------- */
pre.code-block {
  background: #0e0e10;
  color: #e6e8f0;
  max-width: 100%;
  min-width: 0;
  padding: 1rem 1.1rem;
  font-family: var(--font-mono), monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  border: 1px solid rgba(14,14,16,0.18);
  overflow-x: auto;
  position: relative;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}
pre.code-block::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--indigo) 0 70%, var(--jade) 70% 100%);
}
pre.code-block .prompt { color: var(--indigo); }
pre.code-block .comment { color: #8b8f9a; }
pre.code-block .key { color: var(--ochre); }

@media (max-width: 640px) {
  pre.code-block { font-size: 0.76rem; padding: 0.85rem 0.95rem; }
}

code.inline {
  background: var(--paper-deep);
  border: 1px solid rgba(14,14,16,0.14);
  padding: 0.05rem 0.32rem;
  font-family: var(--font-mono), monospace;
  font-size: 0.85em;
  border-radius: 2px;
}

/* ---------- nav link ---------- */
.nav-link {
  font-family: var(--font-mono), monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  position: relative;
  padding: 0.25rem 0;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--indigo);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}
.nav-link:hover::after, .nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* ---------- ticker ---------- */
.ticker-track {
  display: inline-flex;
  gap: 3rem;
  white-space: nowrap;
  animation: ticker 80s linear infinite;
  padding-right: 3rem;
}
@keyframes ticker {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- decorative big CJK in margin ---------- */
.margin-glyph {
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  color: var(--ink);
  opacity: 0.04;
  font-size: 18rem;
  line-height: 0.9;
  pointer-events: none;
  user-select: none;
  position: absolute;
}

/* ---------- focus + selection ---------- */
::selection { background: var(--indigo); color: var(--paper); }
:focus-visible { outline: 2px solid var(--indigo); outline-offset: 2px; }

/* ---------- link reset ---------- */
a { color: inherit; text-decoration: none; }
a.body-link {
  color: var(--ink);
  background-image: linear-gradient(var(--indigo), var(--indigo));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
  transition: background-size 180ms ease;
}
a.body-link:hover { background-size: 100% 6px; color: var(--ink); }

/* ---------- mermaid container ----------
   Mermaid renders its own SVG; we just give it room to breathe and a
   horizontal scroll on phones so the diagram never overflows the viewport. */
.mermaid-frame {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.mermaid-frame svg {
  display: block;
  margin: 0 auto;
  height: auto;
  max-width: 100%;
}

/* ---------- mobile-only adjustments ---------- */
@media (max-width: 640px) {
  /* Big CJK margin glyph already hidden via tailwind's `hidden lg:block`,
     but re-assert that nothing hits the viewport edge. */
  .margin-glyph { display: none; }

  /* Ticker text gets cramped on phones — shrink + tighten gaps */
  .ticker-track { gap: 1.5rem; padding-right: 1.5rem; }
}

/* Anchor fallback; page-level scroll-mt utilities should be able to override it. */
:where([id]) { scroll-margin-top: 5rem; }