/* Chang Sheng Foundation — site styles
   Aesthetic: gallery-paper warmth, brass accents, refined typography */

:root {
  /* Warm gallery palette */
  --bg-deep:   #ebe1cc;   /* outer "wall" tone */
  --bg:        #f4ecd9;   /* page cream */
  --surface:   #fbf6e9;   /* card / paper */
  --ink:       #1f1c17;   /* deep ink */
  --ink-soft:  #6a6357;   /* secondary text */
  --accent:    #8b6f3f;   /* gallery brass */
  --accent-2:  #b08a4f;   /* lighter brass */
  --rule:      #ddd1b6;   /* hairline */
  --rule-soft: #ece2c9;
  --max: 880px;

  /* Elegant serif stack — uses what's installed; no external fonts */
  --serif: "Hoefler Text", "Iowan Old Style", "Cormorant Garamond",
           "EB Garamond", "Adobe Caslon Pro", "Palatino Linotype",
           Palatino, Georgia, serif;
  --sans:  "Optima", "Avenir Next", "Avenir", "Helvetica Neue",
           system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;

  /* Layered background:
     1) very subtle paper noise (SVG turbulence)
     2) a soft warm vignette
     3) the cream base color */
  background-color: var(--bg);
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='320' height='320'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.32  0 0 0 0 0.25  0 0 0 0 0.15  0 0 0 0.07 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>"),
    radial-gradient(ellipse at 50% 0%, rgba(255, 245, 220, 0.55), transparent 70%),
    radial-gradient(ellipse at 100% 100%, rgba(176, 138, 79, 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed, fixed, fixed, fixed;
  background-size: 320px 320px, auto, auto, auto;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(139, 111, 63, 0.25);
  transition: color 0.15s ease, border-color 0.15s ease;
}
a:hover {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ========== Header ========== */
.site-header {
  background:
    linear-gradient(180deg, rgba(255, 250, 235, 0.85), rgba(251, 246, 233, 0.7));
  backdrop-filter: saturate(110%) blur(2px);
  border-bottom: 1px solid var(--rule);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset,
              0 6px 24px -18px rgba(31, 28, 23, 0.25);
}
.site-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
  text-align: center;
}
.brand {
  display: inline-block;
  color: var(--ink);
  border-bottom: none;
}
.brand-title {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin: 0;
  line-height: 1.1;
}
.brand-tagline {
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.78rem;
  font-style: normal;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  margin: 0.6rem 0 0.6rem;
}
.brand-tagline::before,
.brand-tagline::after {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin: 0 0.7rem;
  opacity: 0.7;
}

/* ========== Nav ========== */
nav.site-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem 2rem;
  padding: 0.9rem 0 1rem;
  margin-top: 0.8rem;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
nav.site-nav a {
  color: var(--ink-soft);
  padding: 0.4rem 0.1rem;
  border-bottom: 1px solid transparent;
}
nav.site-nav a:hover,
nav.site-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ========== Main ========== */
main {
  max-width: var(--max);
  margin: 2.5rem auto;
  padding: 3rem 3rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.7) inset,
    0 30px 60px -40px rgba(31, 28, 23, 0.25),
    0 8px 20px -16px rgba(31, 28, 23, 0.15);
  position: relative;
}
/* faint paper grain over the card */
main::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.2' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.18  0 0 0 0 0.14  0 0 0 0 0.08  0 0 0 0.04 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 220px 220px;
  opacity: 0.7;
  mix-blend-mode: multiply;
}
main > * { position: relative; }

h1 {
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 400;
  margin: 0 0 1.6rem;
  letter-spacing: 0.005em;
  line-height: 1.2;
  color: var(--ink);
}

h2 {
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 400;
  margin: 2.4rem 0 0.7rem;
  color: var(--ink);
  letter-spacing: 0.01em;
  font-variant: small-caps;
}

h3 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  margin: 1.8rem 0 0.6rem;
  color: var(--accent);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

p { margin: 0 0 1.2rem; }

ul { margin: 0 0 1.4rem; padding-left: 1.4rem; }
ul li { margin-bottom: 0.55rem; }
ul li::marker { color: var(--accent); }

.lede {
  font-size: 1.18rem;
  font-style: italic;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* ========== Document list ========== */
.doc-list {
  list-style: none;
  padding: 0;
  margin: 0.4rem 0 1.6rem;
}
.doc-list li {
  margin: 0;
  border-top: 1px solid var(--rule-soft);
}
.doc-list li:last-child { border-bottom: 1px solid var(--rule-soft); }
.doc-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.8rem 0.4rem;
  color: var(--ink);
  border-bottom: none;
  transition: background 0.15s ease, padding-left 0.15s ease;
}
.doc-list a:hover {
  background: rgba(176, 138, 79, 0.07);
  padding-left: 0.9rem;
  color: var(--ink);
}
.doc-list .doc-meta {
  flex-shrink: 0;
  font-family: var(--sans);
  font-size: 0.7rem;
  color: var(--ink-soft);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-style: normal;
}

/* ========== Donate button ========== */
.donate-cta {
  text-align: center;
  margin: 2.2rem 0 0.8rem;
}
.donate-button {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--surface);
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  padding: 0.95rem 2.4rem;
  border: 1px solid var(--accent);
  border-bottom: none;
  border-radius: 2px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 0 0 1px rgba(255, 255, 255, 0.15) inset,
    0 8px 16px -8px rgba(31, 28, 23, 0.35),
    0 2px 4px -2px rgba(31, 28, 23, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}
.donate-button:hover {
  color: var(--surface);
  filter: brightness(1.06);
  transform: translateY(-1px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.3) inset,
    0 12px 22px -8px rgba(31, 28, 23, 0.4),
    0 4px 8px -2px rgba(31, 28, 23, 0.25);
}
.donate-button:active {
  transform: translateY(0);
  filter: brightness(0.97);
}
.donate-note {
  text-align: center;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  margin-bottom: 1.6rem;
}

/* ========== Callout ========== */
.callout {
  background:
    linear-gradient(180deg, rgba(255, 250, 235, 0.75), rgba(251, 246, 233, 0.5));
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 1.3rem 1.5rem;
  margin: 1.8rem 0;
  font-style: italic;
  color: var(--ink);
}
.callout p:last-child { margin-bottom: 0; }
.callout em, .callout i { font-style: normal; }

/* ========== Footer ========== */
.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.2rem 1.5rem 3rem;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-align: center;
}
.site-footer::before {
  content: "";
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent);
  margin: 0 auto 1.2rem;
  opacity: 0.6;
}
.site-footer a {
  color: var(--ink-soft);
  border-bottom: none;
}
.site-footer a:hover { color: var(--ink); }

/* ========== Responsive ========== */
@media (max-width: 720px) {
  body { font-size: 17px; }
  main { margin: 1.2rem 1rem; padding: 2rem 1.5rem; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.35rem; }
  .brand-title { font-size: 1.9rem; }
  nav.site-nav { gap: 0.4rem 1.2rem; font-size: 0.72rem; letter-spacing: 0.18em; }
  .doc-list a { flex-direction: column; gap: 0.2rem; }
}