/* ───────────────────────────────────────────────────────────
   yangxuezhou.work — shared styles
   Bilingual editorial. Minimal black/white. Serif-first.
   ─────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500;1,600&family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Noto+Serif+SC:wght@300;400;500;600&family=Noto+Sans+SC:wght@300;400;500;600&family=ZCOOL+XiaoWei&family=Ma+Shan+Zheng&family=Long+Cang&family=Geist:wght@300;400;500;600&family=Geist+Mono:wght@400;500&display=swap');

:root {
  /* Type */
  --font-display: "Cormorant Garamond", "Noto Serif SC", "Songti SC", serif;
  --font-body:    "EB Garamond", "Noto Serif SC", "Songti SC", serif;
  --font-zh:      "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-sans:    "Geist", ui-sans-serif, -apple-system, system-ui, sans-serif;
  --font-mono:    "Geist Mono", ui-monospace, "SF Mono", monospace;

  /* Light palette (default) */
  --bg:           #F7F7F5;
  --bg-elev:      #ffffff;
  --fg:           #14130f;
  --fg-muted:     #5b574e;
  --fg-soft:      #8a857a;
  --rule:         rgba(20, 19, 15, 0.14);
  --rule-soft:    rgba(20, 19, 15, 0.06);

  /* Accent — neon pink (light mode default) */
  --primary:      #14130f;
  --accent:       #FF2D87;

  /* Scale */
  --pad-x: clamp(24px, 5vw, 80px);
  --pad-y: clamp(28px, 4vw, 56px);

  /* Anim */
  --ease: cubic-bezier(.2,.7,.2,1);
}

html.dark {
  --bg:          #0d0c0a;
  --bg-elev:     #16140f;
  --fg:          #ece8de;
  --fg-muted:    #98948a;
  --fg-soft:     #65615a;
  --rule:        rgba(236, 232, 222, 0.16);
  --rule-soft:   rgba(236, 232, 222, 0.07);
  --primary:     #ece8de;
  /* dark mode keeps the original ink-red accent */
  --accent:      #c0392b;
}

/* sans toggle */
html.sans {
  --font-display: "Geist", -apple-system, system-ui, sans-serif;
  --font-body:    "Geist", -apple-system, system-ui, sans-serif;
}

/* Chinese typeface options. Set via [data-zh-font="..."] on <html>. */
html[data-zh-font="songti"]   { --font-zh: "Noto Serif SC", "Songti SC", "STSong", serif; }
html[data-zh-font="heiti"]    { --font-zh: "Noto Sans SC", "PingFang SC", -apple-system, sans-serif; }
html[data-zh-font="kaishu"]   { --font-zh: "Ma Shan Zheng", "Kaiti SC", "STKaiti", cursive; }
html[data-zh-font="xiaowei"]  { --font-zh: "ZCOOL XiaoWei", "Noto Serif SC", serif; }
html[data-zh-font="longcang"] { --font-zh: "Long Cang", "Noto Serif SC", cursive; }

/* Ensure .zh always uses the Chinese family, even when html.sans flips
   the latin fonts. */
.zh, html.sans .zh { font-family: var(--font-zh); }

/* ───────── reset / base ───────── */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.55;
  font-feature-settings: "kern", "liga", "onum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .35s var(--ease), color .35s var(--ease);
  min-height: 100vh;
}

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

a { color: inherit; text-decoration: none; }
a.underline-link {
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size .5s var(--ease), color .25s var(--ease);
}
a.underline-link:hover {
  color: var(--accent);
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 400; margin: 0; letter-spacing: -0.01em; }

.zh { font-family: var(--font-zh); font-weight: 400; }
html.sans .zh { font-family: "PingFang SC", "Noto Sans SC", sans-serif; }

/* ───────── top nav ───────── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 22px var(--pad-x);
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--rule-soft);
  transition: background .35s var(--ease), border-color .35s var(--ease);
}
.site-nav > * { pointer-events: auto; }
.site-nav .brand {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--fg);
}
.site-nav .brand em {
  font-style: normal;
}
.site-nav .brand .ampersand {
  display: inline-block;
  width: 5px; height: 5px;
  background: var(--accent);
  border-radius: 50%;
  vertical-align: middle;
  margin: 0 6px 2px;
}
.site-nav .links {
  display: flex; gap: 28px; align-items: baseline;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg);
}
.site-nav .links a {
  position: relative;
  padding: 4px 0;
  opacity: 0.6;
  transition: opacity .3s var(--ease);
}
.site-nav .links a:hover { opacity: 1; }
.site-nav .links a.active { opacity: 1; }
.site-nav .links a.active::after {
  content: "";
  position: absolute; left: -10px; top: 50%;
  width: 4px; height: 4px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateY(-50%);
}
.site-nav .mode-toggle {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  color: var(--fg); font-family: var(--font-sans); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase; opacity: 0.6;
  padding: 6px 0; margin-left: 22px;
  transition: opacity .3s var(--ease);
}
.site-nav .mode-toggle:hover { opacity: 1; }

/* ───────── footer ───────── */
.site-foot {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 36px var(--pad-x) 28px;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-soft);
  border-top: 1px solid var(--rule-soft);
  margin-top: 80px;
}
.site-foot .dot {
  display: inline-block; width: 5px; height: 5px;
  background: var(--accent); border-radius: 50%;
  vertical-align: middle; margin: 0 8px 2px;
}

/* ───────── shared editorial bits ───────── */
.eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.rule { height: 1px; background: var(--rule); border: 0; margin: 0; }

/* arriving page transition */
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.rise { animation: rise .9s var(--ease) both; }
.rise-d1 { animation-delay: .08s; }
.rise-d2 { animation-delay: .16s; }
.rise-d3 { animation-delay: .24s; }
.rise-d4 { animation-delay: .32s; }
.rise-d5 { animation-delay: .40s; }

/* ───────── reusable container ───────── */
.wrap {
  max-width: 1440px;
  margin: 0 auto;
  padding: 120px var(--pad-x) 60px;
}
.wrap-narrow {
  max-width: 880px;
  margin: 0 auto;
  padding: 120px var(--pad-x) 60px;
}

/* cursor dot — micro-interaction */
.cursor-dot {
  position: fixed;
  left: -10px; top: -10px;
  width: 8px; height: 8px;
  margin-left: -4px; margin-top: -4px;
  background: var(--accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 99999;
  mix-blend-mode: difference;
  transition: width .25s var(--ease), height .25s var(--ease), opacity .25s;
  opacity: 0.85;
}
.cursor-dot.big { width: 28px; height: 28px; opacity: 0.4; }
@media (hover: none) { .cursor-dot { display: none; } }
