/* ==========================================================================
   Fonts
   ========================================================================== */

@font-face {
  font-family: "Lora";
  font-style: normal;
  font-weight: 500 700;
  font-display: swap;
  src: url("/fonts/lora-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ==========================================================================
   Themes — every colour in the site comes from these tokens.
   All text/background pairs checked for WCAG AA (>= 4.5:1).
   ========================================================================== */

:root,
[data-theme="sage"] {
  --color-bg: #f7f5f0;
  --color-surface: #ffffff;
  --color-surface-alt: #e9ede4;
  --color-text: #2b2e29;
  --color-muted: #596055;
  --color-primary: #4a6650;
  --color-primary-dark: #3a5240;
  --color-accent: #85502f;
  --color-border: #d9ddd2;
}

[data-theme="slate"] {
  --color-bg: #f6f7f7;
  --color-surface: #ffffff;
  --color-surface-alt: #e4ebee;
  --color-text: #24303a;
  --color-muted: #55626b;
  --color-primary: #3d5f6d;
  --color-primary-dark: #2f4b57;
  --color-accent: #80552c;
  --color-border: #d3dce0;
}

[data-theme="clay"] {
  --color-bg: #fbf7f2;
  --color-surface: #ffffff;
  --color-surface-alt: #f2e6da;
  --color-text: #33291f;
  --color-muted: #6a5a4b;
  --color-primary: #9a4f33;
  --color-primary-dark: #7d3f28;
  --color-accent: #4f6b5c;
  --color-border: #e6d8ca;
}

[data-theme="lavender"] {
  --color-bg: #f8f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #ebe8f3;
  --color-text: #2b2836;
  --color-muted: #5e5a6e;
  --color-primary: #5f5389;
  --color-primary-dark: #4b416e;
  --color-accent: #715622;
  --color-border: #dcd8e8;
}

/* ==========================================================================
   Tokens
   ========================================================================== */

:root {
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  --font-heading: "Lora", Georgia, "Times New Roman", serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;

  --radius: 1rem;
  --radius-pill: 999px;
  --max-width: 68rem;
  --prose-width: 44rem;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 8px 24px rgb(0 0 0 / 0.06);
}

/* Chinese headings: the Latin serif would mix poorly with CJK sans glyphs. */
:lang(zh) {
  --font-heading: var(--font-body);
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  text-wrap: balance;
}
h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3rem); margin: 0 0 var(--space-2); }
h2 { font-size: clamp(1.5rem, 1.25rem + 1vw, 1.875rem); margin: var(--space-4) 0 var(--space-2); }
h3 { font-size: 1.25rem; margin: var(--space-3) 0 var(--space-1); }

p { margin: 0 0 var(--space-2); }

a { color: var(--color-primary); text-underline-offset: 0.2em; }
a:hover { color: var(--color-primary-dark); }

:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }

img { max-width: 100%; height: auto; display: block; }

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -100px;
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary);
  color: #fff;
  z-index: 100;
}
.skip-link:focus { top: var(--space-2); }

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s ease;
}
.button:hover { background: var(--color-primary-dark); color: #fff; }

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding-block: var(--space-2);
}

.brand { display: flex; flex-direction: column; text-decoration: none; line-height: 1.3; }
.brand-name { font-family: var(--font-heading); font-weight: 600; font-size: 1.2rem; color: var(--color-text); }
.brand-tagline { font-size: 0.85rem; color: var(--color-muted); }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}
.nav-list a { color: var(--color-text); text-decoration: none; padding-block: 0.25rem; }
.nav-list a:hover { color: var(--color-primary); }
.nav-list a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--color-primary);
}
.nav-list .lang-switch {
  padding: 0.25rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
}
.nav-list .lang-switch:hover { border-color: var(--color-primary); }

/* ==========================================================================
   Home
   ========================================================================== */

.hero {
  background: var(--color-surface-alt);
  padding-block: var(--space-5);
}
.hero-inner {
  display: grid;
  gap: var(--space-4);
  align-items: center;
}
.portrait {
  width: min(100%, 20rem);
  justify-self: center;
  border-radius: 50%;
  box-shadow: var(--shadow);
}
.eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}
.lead { font-size: 1.2rem; color: var(--color-muted); max-width: 36rem; }
.credential { margin-top: var(--space-3); font-size: 0.9rem; color: var(--color-muted); }

@media (min-width: 48rem) {
  .hero-inner { grid-template-columns: 1.4fr 1fr; }
}

.section { padding-block: var(--space-4); }
.section-heading { margin-top: 0; text-align: center; }

.card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card p { color: var(--color-muted); flex-grow: 1; }
.card-link { font-weight: 600; text-decoration: none; }
.card-link:hover { text-decoration: underline; }

.banner img {
  width: 100%;
  height: clamp(12rem, 30vw, 22rem);
  object-fit: cover;
}

.acknowledgement {
  max-width: var(--prose-width);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ==========================================================================
   Inner pages
   ========================================================================== */

.page-header {
  background: var(--color-surface-alt);
  padding-block: var(--space-4) var(--space-3);
}
.page-header h1 { margin: 0; max-width: var(--prose-width); margin-inline: auto; }

.prose { max-width: var(--prose-width); padding-block: var(--space-3); }
.prose h2 { clear: both; padding-top: var(--space-2); border-top: 1px solid var(--color-border); }
.prose h2:first-child { border-top: 0; padding-top: 0; margin-top: var(--space-2); }
.prose h3 { color: var(--color-accent); font-size: 1.15rem; }

.prose .page-image {
  width: 100%;
  border-radius: var(--radius);
  margin-block: var(--space-2);
}
@media (min-width: 40rem) {
  .prose .page-image {
    float: right;
    width: 40%;
    margin: 0.4rem 0 var(--space-2) var(--space-3);
  }
}
.prose p:has(> .page-image:only-child) { margin: 0; }

.prose dl {
  clear: both;
  display: grid;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.prose dt { font-weight: 600; color: var(--color-primary); }
.prose dd { margin: 0 0 var(--space-1); }
@media (min-width: 40rem) {
  .prose dl { grid-template-columns: max-content 1fr; }
  .prose dd { margin: 0; }
}

/* ==========================================================================
   "Here you can expect" band
   ========================================================================== */

.expect {
  clear: both;
  margin-top: var(--space-4);
  padding-block: var(--space-4);
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}
.expect-inner {
  display: grid;
  gap: var(--space-3);
  align-items: center;
}
.expect h2 { margin-top: 0; }
.expect-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}
.expect-icon { display: inline-block; width: 1.75em; }
@media (min-width: 48rem) {
  .expect-inner { grid-template-columns: 1fr auto; }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding-block: var(--space-4);
  background: var(--color-primary-dark);
  color: #fff;
  font-size: 0.9rem;
}
.site-footer a { color: #fff; }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
}
.footer-brand { font-family: var(--font-heading); font-size: 1.1rem; font-weight: 600; margin-bottom: 0.25rem; }
.footer-contact { list-style: none; margin: 0; padding: 0; }

/* ==========================================================================
   Dev-only theme preview (rendered only by `build.py --serve`)
   ========================================================================== */

.theme-preview {
  position: fixed;
  right: var(--space-2);
  bottom: var(--space-2);
  z-index: 50;
  display: flex;
  gap: 0.25rem;
  padding: 0.375rem;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow);
  font: 13px/1 system-ui, sans-serif;
}
.theme-preview button {
  padding: 0.375rem 0.75rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  cursor: pointer;
  text-transform: capitalize;
}
.theme-preview button[aria-pressed="true"] { background: #222; color: #fff; }