/* Phantom Blade Zero Guide — visual system derived from _research/visual.md
   Palette: paper / ink / cinnabar / old gold / jade grey. */

@font-face {
  font-family: "Cormorant Garamond";
  src: url("fonts/cormorant-garamond-latin.woff2") format("woff2");
  font-weight: 600 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Source Sans 3";
  src: url("fonts/source-sans-3-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #ece4d4;
  --panel: #f5efe3;
  --ink: #14100e;
  --ink-soft: #4a4038;
  --accent: #b23a34;
  --accent-wash: rgba(178, 58, 52, .08);
  --gold: #a8803c;
  --jade: #6f807b;
  --line: rgba(20, 16, 14, .16);
  --line-strong: rgba(20, 16, 14, .32);
  --bg: var(--paper);
  --bg-soft: rgba(20, 16, 14, .04);
  --shadow: 2px 2px 0 var(--ink);
  --serif: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
  --sans: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;
  --radius: 3px;
  --wrap: 1120px;
}

html[data-theme="dark"] {
  --paper: #07090a;
  --panel: #121516;
  --ink: #ece4d4;
  --ink-soft: #a9a095;
  --accent: #c23a3a;
  --accent-wash: rgba(194, 58, 58, .14);
  --gold: #e3bf73;
  --jade: #788887;
  --line: rgba(120, 136, 135, .26);
  --line-strong: rgba(120, 136, 135, .46);
  --bg: var(--paper);
  --bg-soft: rgba(236, 228, 212, .05);
  --shadow: 2px 2px 0 rgba(0, 0, 0, .65);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    radial-gradient(1100px 520px at 18% -8%, rgba(255, 255, 255, .28), transparent 62%),
    radial-gradient(900px 420px at 92% 4%, rgba(168, 128, 60, .07), transparent 58%),
    radial-gradient(1200px 800px at 50% 110%, rgba(111, 128, 123, .06), transparent 70%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html[data-theme="dark"] body {
  background-image:
    radial-gradient(1100px 520px at 18% -8%, rgba(194, 58, 58, .05), transparent 62%),
    radial-gradient(900px 420px at 92% 4%, rgba(227, 191, 115, .05), transparent 58%),
    radial-gradient(1200px 800px at 50% 110%, rgba(120, 136, 135, .08), transparent 70%);
}

img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.12;
  color: var(--ink);
  letter-spacing: .01em;
}

p { margin: 0 0 1.1rem; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: -9999px;
  background: var(--ink);
  color: var(--paper);
  padding: .6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.25rem; }

/* ---------- header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--accent);
  color: #f7f1e5;
  border-radius: 1px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .25);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: .02em;
}
.brand-sub { font-size: .68rem; color: var(--ink-soft); letter-spacing: .04em; text-transform: uppercase; }

.main-nav {
  display: flex;
  align-items: center;
  gap: .15rem;
  margin-left: auto;
  flex-wrap: wrap;
}
.main-nav a {
  padding: .42rem .62rem;
  font-size: .84rem;
  color: var(--ink-soft);
  text-decoration: none;
  border-radius: 1px;
  letter-spacing: .02em;
}
.main-nav a:hover { background: var(--bg-soft); color: var(--ink); }
.main-nav a[aria-current="page"] {
  background: var(--accent-wash);
  color: var(--accent);
  box-shadow: inset 0 -2px 0 var(--accent);
  font-weight: 600;
}

.header-actions { display: flex; gap: .35rem; }
.icon-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 1px;
  color: var(--ink-soft);
  cursor: pointer;
}
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.menu-btn { display: none; }

/* ---------- hero ---------- */
.hero { padding: 3.4rem 0 1.6rem; max-width: 820px; }
.eyebrow {
  display: inline-block;
  margin: 0 0 .85rem;
  padding: .22rem .55rem;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #f7f1e5;
  background: var(--accent);
  border-radius: 1px;
}
.hero h1 {
  font-size: clamp(2.3rem, 5vw, 3.6rem);
  margin: 0 0 .9rem;
  letter-spacing: -.01em;
}
.lede { font-size: 1.1rem; color: var(--ink-soft); margin: 0 0 1.2rem; max-width: 720px; }

.hero-status {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.1rem;
}
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .34rem .7rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  font-size: .8rem;
  letter-spacing: .03em;
  box-shadow: inset 0 0 0 1px rgba(168, 128, 60, .18);
}
.status-chip strong { color: var(--gold); font-weight: 700; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  padding: .55rem 1.05rem;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  font-size: .9rem;
  text-decoration: none;
  box-shadow: inset 0 0 0 1px var(--paper);
  border-radius: 1px;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #f7f1e5; }

/* ---------- home cards ---------- */
.card-group { padding: 2rem 0; border-top: 1px solid var(--line); }
.card-group > h2 {
  font-size: 1.55rem;
  margin: 0 0 .25rem;
}
.card-group > p.group-note { color: var(--ink-soft); font-size: .92rem; margin: 0 0 1.1rem; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.05rem 1.05rem 1.15rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  border-radius: 1px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(168, 128, 60, .14);
}
.card::after {
  content: "";
  position: absolute;
  top: .55rem;
  right: .55rem;
  width: 9px;
  height: 9px;
  background: var(--accent);
  opacity: .8;
}
.card:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.card h3 { font-size: 1.16rem; margin: 0; }
.card p { margin: 0; color: var(--ink-soft); font-size: .9rem; line-height: 1.55; }
.card-tag {
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
}

/* ---------- article ---------- */
.breadcrumb { padding: 1.1rem 0 0; font-size: .8rem; color: var(--ink-soft); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .35rem; list-style: none; margin: 0; padding: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: .35rem; color: var(--line-strong); }
.breadcrumb a { color: var(--ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }

.doc { padding-bottom: 3rem; }
.article-head { padding: 1.6rem 0 1.3rem; max-width: 800px; }
.article-head h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.85rem);
  margin: 0 0 .8rem;
}
.article-head .lede { font-size: 1.04rem; }
.meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-size: .78rem;
  color: var(--ink-soft);
  letter-spacing: .02em;
}
.badge {
  padding: .18rem .5rem;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.meta-row .dot { color: var(--line-strong); }

.keybox {
  max-width: 800px;
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  box-shadow: inset 0 0 0 1px rgba(168, 128, 60, .14);
}
.keybox h2 {
  font-family: var(--sans);
  font-size: .72rem;
  margin: 0 0 .65rem;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--ink-soft);
}
.keybox dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: .4rem 1.1rem;
  margin: 0;
  font-size: .9rem;
}
.keybox dt { color: var(--ink-soft); }
.keybox dd { margin: 0; }

.prose { max-width: 800px; padding-bottom: 2rem; }
.prose h2 {
  font-size: 1.7rem;
  margin: 2.4rem 0 .8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
.prose h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.prose h3 { font-size: 1.24rem; margin: 1.6rem 0 .5rem; }
.prose ul, .prose ol { margin: 0 0 1.1rem; padding-left: 1.3rem; }
.prose li { margin: .35rem 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.4rem;
  font-size: .9rem;
  border: 1px solid var(--line);
}
.prose th {
  background: var(--bg-soft);
  text-align: left;
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.prose th, .prose td {
  padding: .55rem .7rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.prose tbody tr:last-child td { border-bottom: 0; }
.prose code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: .86em;
  background: var(--bg-soft);
  padding: .1rem .3rem;
  border-radius: 1px;
}
.prose blockquote {
  margin: 1.2rem 0;
  padding: .2rem 0 .2rem 1rem;
  border-left: 3px solid var(--gold);
  color: var(--ink-soft);
}
.note {
  margin: 1.2rem 0;
  padding: .8rem 1rem;
  background: var(--accent-wash);
  border: 1px solid var(--line);
  font-size: .92rem;
}

/* page figure (original SVG infographics) */
.page-figure {
  margin: 1.6rem 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-figure img { display: block; width: 100%; height: auto; }
.page-figure figcaption {
  padding: .55rem .8rem;
  border-top: 1px solid var(--line);
  font-size: .78rem;
  color: var(--ink-soft);
}

/* ---------- ads (reserved slots) ---------- */
.ad-slot {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  max-width: 970px;
  min-height: 90px;
  margin: 1.5rem 0;
  border: 1px dashed var(--line-strong);
  background: var(--bg-soft);
  color: var(--ink-soft);
  text-align: center;
}
.ad-slot .ad-label {
  position: absolute;
  top: .25rem;
  left: .4rem;
  font-size: .58rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: .75;
}
.ad-slot--rectangle { max-width: 336px; min-height: 280px; margin-left: auto; margin-right: auto; }
.ad-slot.is-filled { border: 0; background: transparent; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 1.25rem 1.4rem;
}
.footer-brand { max-width: 360px; }
.footer-brand .brand-name { margin: 0; }
.footer-note { color: var(--ink-soft); font-size: .82rem; margin: .4rem 0 0; }
.footer-cols { display: flex; gap: 2.5rem; }
.footer-cols a {
  display: block;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .86rem;
  padding: .12rem 0;
}
.footer-cols a:hover { color: var(--accent); }
.footer-head {
  margin: 0 0 .45rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink);
}
.footer-base {
  padding-top: 1rem;
  padding-bottom: 1.6rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .78rem;
}
.footer-base p { margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .menu-btn { display: grid; }
  .main-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: .4rem 1.25rem .8rem;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .12);
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: .6rem .2rem; border-bottom: 1px solid var(--line); }
  .header-inner { position: relative; }
  .keybox dl { grid-template-columns: 1fr; gap: .1rem; }
  .keybox dd { margin-bottom: .5rem; }
  .prose table { display: block; overflow-x: auto; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding-top: 2.2rem; }
  .ad-slot { min-height: 100px; }
  .ad-slot--rectangle { min-height: 250px; }
  .footer-cols { flex-wrap: wrap; gap: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}