/* === Design tokens · Editorial Warm Ochre (matches airevision + cert) === */
:root {
  /* Colors — warm ochre + cream */
  --c-primary:       oklch(0.42 0.115 45);      /* accent-deep (ochre) */
  --c-primary-light: oklch(0.58 0.145 48);      /* accent (ochre orange) */
  --c-accent:        oklch(0.58 0.145 48);      /* main accent */
  --c-accent-soft:   oklch(0.95 0.040 65);      /* accent-tint (cream) */
  --c-accent-2:      oklch(0.91 0.060 60);      /* accent-tint-2 */
  --c-bg:            oklch(0.985 0.006 75);     /* warm paper bg */
  --c-bg-2:          oklch(0.97 0.012 70);      /* warm paper */
  --c-surface:       oklch(1 0 0);              /* white elevated */
  --c-text:          oklch(0.22 0.012 60);      /* ink */
  --c-text-soft:     oklch(0.40 0.012 60);      /* ink-soft */
  --c-text-muted:    oklch(0.55 0.012 60);      /* ink-muted */
  --c-border:        oklch(0.90 0.012 70);      /* rule */
  --c-border-soft:   oklch(0.94 0.010 70);
  --c-success:       oklch(0.55 0.090 145);
  --c-warn:          oklch(0.68 0.140 60);
  --c-danger:        oklch(0.55 0.150 25);

  /* Border-radius (tighter, editorial) */
  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 12px;

  /* Shadows (softer, warm-tinted) */
  --shadow-sm: 0 1px 2px oklch(0.20 0.02 50 / 0.06);
  --shadow:    0 1px 3px oklch(0.20 0.02 50 / 0.08);
  --shadow-lg: 0 6px 20px oklch(0.45 0.12 48 / 0.12);

  /* Layout */
  --maxw: 1240px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;

  /* Typography — serif default (body + headings), sans for UI labels */
  --font-serif-zh: "Noto Serif HK", "Songti TC", "Source Han Serif TC", "Noto Serif CJK TC", serif;
  --font-serif-en: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --font-sans-zh:  "Inter", ui-sans-serif, system-ui, -apple-system, "PingFang TC", "Noto Sans TC", sans-serif;
  --font-sans-en:  "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono:     "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Backward-compat aliases — old code references these; default to SERIF */
  --font-zh: var(--font-serif-zh);
  --font-en: var(--font-serif-en);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-serif-zh), var(--font-serif-en);
  color: var(--c-text);
  background: var(--c-bg);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga", "calt";
}

body { font-family: var(--font-serif-zh), var(--font-serif-en); }

h1, h2, h3, h4 {
  font-family: var(--font-serif-zh), var(--font-serif-en);
  color: var(--c-text);
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  font-weight: 600;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); letter-spacing: -0.02em; line-height: 1.1; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }

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

a {
  color: var(--c-primary-light);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--c-accent); }

/* === Layout === */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.section {
  padding: var(--space-5) 0;
}

/* === Header === */
.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,0.85);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif-en);
  font-weight: 600;
  color: var(--c-text);
  font-size: 15px;
  text-decoration: none;
}
.brand-mark {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  flex-shrink: 0;
}
.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
/* Legacy fallback if .brand-mark contains text (蘇) */
.brand-mark:not(:has(img)) {
  width: 32px; height: 32px;
  border-radius: 6px;
  background: var(--c-accent);
  color: oklch(0.99 0.01 70);
  font-family: var(--font-serif-en);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
}
.nav {
  display: flex;
  gap: 4px;
  font-family: var(--font-sans-zh);
}
.nav a {
  color: var(--c-text-soft);
  font-size: 13.5px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  transition: all 0.15s;
  letter-spacing: 0.02em;
}
.nav a:hover, .nav a.active {
  color: var(--c-primary);
  background: var(--c-accent-soft);
}

/* === Hero === */
.hero {
  padding: var(--space-6) 0 var(--space-5);
  background: var(--c-bg);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -160px; left: 50%;
  transform: translateX(-50%);
  width: 720px; height: 360px;
  background: radial-gradient(ellipse at center, var(--c-accent-soft), transparent 70%);
  pointer-events: none;
  opacity: 0.6;
  z-index: 0;
}
.hero > .container { position: relative; z-index: 1; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans-zh);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-primary);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.hero-eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--c-accent);
}

/* === Program brand block (主名 + 副標) === */
.program-brand {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--c-border);
  display: inline-block;
}
.program-name-zh {
  font-family: var(--font-serif-zh);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.005em;
  line-height: 1.25;
}
.program-name-en {
  font-family: var(--font-sans-zh);
  font-size: 12px;
  font-weight: 500;
  color: var(--c-text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 6px;
}
.program-framework {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: var(--space-2);
  padding: 10px 22px;
  border-radius: 999px;
  border: 1px solid var(--c-accent-2);
  background: var(--c-accent-soft);
}
.fw-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.fw-zh {
  font-family: var(--font-serif-zh);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-primary);
  letter-spacing: 0.04em;
}
.fw-en {
  font-family: var(--font-sans-zh);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--c-text-muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.85;
}
.fw-sep {
  color: var(--c-accent);
  font-weight: 600;
  font-size: 1rem;
  opacity: 0.6;
}

@media (max-width: 600px) {
  .program-brand { display: block; }
  .program-framework {
    display: flex;
    gap: 8px;
    padding: 6px 12px;
  }
  .fw-en { display: none; }
}
.hero-intro {
  font-family: var(--font-serif-zh);
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.75;
  color: var(--c-text-soft);
  max-width: 640px;
  margin: var(--space-2) 0 var(--space-3);
}
.hero-intro strong { color: var(--c-primary); font-weight: 600; }
.hero-tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--c-text-soft);
  max-width: 680px;
}

/* === Language toggle === */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--c-surface);
  margin-left: 8px;
}
.lang-toggle button {
  background: transparent;
  border: 0;
  padding: 6px 12px;
  font-family: var(--font-sans-zh);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-text-muted);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.lang-toggle button:hover { color: var(--c-text); }
.lang-toggle button.active {
  background: var(--c-accent-soft);
  color: var(--c-primary);
}
html[data-lang="zh"] [data-lang="en"] { display: none !important; }
html[data-lang="en"] [data-lang="zh"] { display: none !important; }
.lang-toggle button[data-lang] { display: inline-flex !important; }

/* === Stages (知 / 行 / 證) === */
.stages > .container { display: grid; gap: var(--space-5); }
.stage { display: grid; gap: var(--space-3); }
.stage-head { max-width: 720px; }
.stage-eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-sans-zh);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 10px;
}
.stage-num {
  font-family: var(--font-mono);
  color: var(--c-primary);
  font-weight: 600;
}
.stage-en { font-weight: 600; }
.stage-title {
  font-family: var(--font-serif-zh);
  font-size: clamp(1.6rem, 3vw, 2rem);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.stage-zh {
  color: var(--c-primary);
  font-weight: 700;
}
.stage-lede {
  font-family: var(--font-serif-zh);
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.8;
  color: var(--c-text-soft);
  margin: 0;
}
.stage-grid-1 { grid-template-columns: minmax(0, 520px) !important; }
.stage-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
.stage + .stage { position: relative; }
.stage + .stage::before {
  content: "";
  display: block;
  width: 1px;
  height: 32px;
  background: linear-gradient(var(--c-accent-2), transparent);
  margin: calc(var(--space-3) * -1) 0 var(--space-2);
}
@media (max-width: 720px) {
  .stage-grid-1, .stage-grid-2 { grid-template-columns: 1fr !important; }
}

/* === Cards (Landing) === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-2);
}
.card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 28px 28px 32px;
  border: 1px solid var(--c-border);
  transition: border-color 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}
.card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-lg);
}
.card-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--c-accent-soft);
  color: var(--c-primary);
  display: grid; place-items: center;
  font-size: 1.5rem;
  margin-bottom: 18px;
  border: 1px solid var(--c-accent-2);
}
.card-title {
  font-family: var(--font-serif-zh);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.card-desc {
  font-family: var(--font-serif-zh), var(--font-serif-en);
  color: var(--c-text-soft);
  font-size: 15px;
  line-height: 1.65;
  flex-grow: 1;
}
.card-cta {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--c-border);
  font-family: var(--font-sans-zh);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-text);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.card-cta::after {
  content: "→";
  transition: transform 0.2s;
  color: var(--c-primary);
}
.card:hover .card-cta::after { transform: translateX(6px); }

/* === Stats === */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
  margin: var(--space-4) 0;
}
.stat {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: var(--space-3);
  text-align: center;
  border: 1px solid var(--c-border);
}
.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--c-accent);
  font-family: var(--font-en);
  line-height: 1;
}
.stat-label {
  color: var(--c-text-soft);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  text-decoration: none;
}
.btn-primary {
  background: var(--c-primary);
  color: white;
}
.btn-primary:hover { background: var(--c-primary-light); color: white; }
.btn-ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-border);
}
.btn-ghost:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* === Breadcrumb === */
.breadcrumb {
  font-size: 0.9rem;
  color: var(--c-text-soft);
  padding: var(--space-2) 0;
}
.breadcrumb a { color: var(--c-text-soft); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { margin: 0 8px; opacity: 0.5; }

/* === Footer === */
.site-footer {
  background: var(--c-bg-2);
  border-top: 1px solid var(--c-border);
  color: var(--c-text-soft);
  padding: var(--space-4) 0 var(--space-3);
  margin-top: var(--space-6);
  font-family: var(--font-sans-zh);
}
.site-footer a { color: var(--c-primary); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.site-footer a:hover { color: var(--c-primary-light); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-4);
}
.footer-grid h4 {
  font-family: var(--font-sans-zh);
  color: var(--c-text);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 600;
  margin-bottom: 14px;
}
.footer-org {
  max-width: 880px;
  margin: 0 auto;
  text-align: left;
}
.footer-org-tag {
  font-family: var(--font-serif-zh);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  font-weight: 500;
  line-height: 1.7;
  color: var(--c-text);
  margin-bottom: 14px;
}
.footer-org-tag strong { color: var(--c-primary); font-weight: 600; }
.footer-org-desc {
  font-family: var(--font-serif-zh);
  font-size: clamp(0.95rem, 1.3vw, 1.05rem);
  line-height: 1.85;
  color: var(--c-text-soft);
  margin: 0 0 var(--space-3);
}
.footer-org-desc strong { color: var(--c-primary); font-weight: 600; }
.footer-roster {
  margin: 0;
  padding: var(--space-2) 0 0;
  border-top: 1px dashed var(--c-border);
  display: grid;
  gap: 10px;
}
.footer-roster-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: baseline;
  gap: var(--space-2);
}
.footer-roster dt {
  font-family: var(--font-sans-zh);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  font-weight: 600;
}
.footer-roster dd {
  margin: 0;
  font-family: var(--font-serif-zh);
  font-size: 0.98rem;
  color: var(--c-text);
  line-height: 1.7;
}
.footer-bottom {
  border-top: 1px solid var(--c-border);
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  text-align: center;
}

/* === Activities (Part 2) === */
.activity {
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
}
.activity-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-2);
}
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--c-accent-soft);
  color: var(--c-primary);
}
.tag-date {
  background: transparent;
  color: var(--c-text-soft);
  font-weight: 500;
}
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-2);
  margin: var(--space-3) 0;
}
.photo-grid img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: zoom-in;
  transition: transform 0.18s;
}
.photo-grid img:hover { transform: scale(1.02); }

.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius);
  overflow: hidden;
  margin: var(--space-3) 0;
  background: #000;
}
.video-wrap iframe, .video-wrap video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.highlight-box {
  background: linear-gradient(135deg, rgba(212,160,23,0.08), rgba(26,58,92,0.05));
  border-left: 4px solid var(--c-accent);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  margin-top: var(--space-3);
  font-style: italic;
  color: var(--c-text);
}

/* === Lightbox === */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: var(--space-3);
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 95vw;
  max-height: 92vh;
  border-radius: var(--radius-sm);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 26px;
  font-size: 2.5rem;
  color: white;
  cursor: pointer;
  background: none;
  border: none;
  line-height: 1;
}

/* === Placeholder (for empty sections) === */
.placeholder {
  background: repeating-linear-gradient(
    45deg,
    rgba(26,58,92,0.04),
    rgba(26,58,92,0.04) 10px,
    rgba(26,58,92,0.07) 10px,
    rgba(26,58,92,0.07) 20px
  );
  border: 2px dashed var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
  color: var(--c-text-soft);
}

/* === Responsive === */
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .footer-roster-row { grid-template-columns: 1fr; gap: 4px; }
  .footer-roster dt { font-size: 10.5px; }
  .nav { gap: var(--space-2); }
  .nav a { font-size: 0.88rem; }
  .activity { padding: var(--space-3); }
}