/* ===== THEME VARS ===== */
:root{
  --bg: #0a0a0a;
  --text: #f5f5f5;
  --muted: #888;
  --muted-light: #aaa;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --maxw: 720px;
  
  /* Surface colors */
  --surface: #111;
  --surface-hover: #1a1a1a;
  --border: #222;
  --border-light: #2a2a2a;
  
  /* Shadows - layered for depth */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.5), 0 4px 8px rgba(0,0,0,0.4);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.6), 0 8px 16px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  
  /* theme toggle animation (desktop / Chromium via View Transitions) */
  --reveal-ease: cubic-bezier(.2,.7,0,1);
  --reveal-pos: 50% 50%;
  --start-size: 8vmax;
  --pop-size: 28vmax;
  --final-size: 150vmax;
  --pop-dur: 160ms;
  --hold-dur: 0ms;
  --expand-dur: 240ms;
  
  /* optional tokens (tables, rules) */
  --rule: #1a1a1a;
  --table-bg: transparent;
  --table-head-bg: rgba(17,17,17,.8);
  --table-border: #222;
  --table-hover-bg: #1a1a1a;
}

:root[data-theme="light"]{
  --bg: #fafafa;
  --text: #1a1a1a;
  --muted: #666;
  --muted-light: #555;
  --accent: #4f46e5;
  --accent-hover: #6366f1;
  --surface: #fff;
  --surface-hover: #f5f5f5;
  --border: #e5e5e5;
  --border-light: #d4d4d4;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.1);
  --rule: #e5e5e5;
  --table-head-bg: rgba(255,255,255,.9);
  --table-border: #e5e5e5;
  --table-hover-bg: #f5f5f5;
}

/* ===== BASE ===== */
*,*::before,*::after{ 
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,body{ 
  height: 100%;
}

body{
  margin: 0;
  background: var(--bg);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(99, 102, 241, 0.02) 0%, transparent 50%);
  background-attachment: fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.02) 100%),
    linear-gradient(90deg, rgba(99, 102, 241, 0.01) 0%, transparent 50%, rgba(99, 102, 241, 0.01) 100%);
  pointer-events: none;
  z-index: 0;
}

:root[data-theme="light"] body::before {
  background: 
    linear-gradient(180deg, transparent 0%, rgba(255,255,255,0.5) 100%),
    linear-gradient(90deg, rgba(79, 70, 229, 0.01) 0%, transparent 50%, rgba(79, 70, 229, 0.01) 100%);
}

:root[data-theme="light"] body {
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(79, 70, 229, 0.02) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(79, 70, 229, 0.015) 0%, transparent 50%);
}

:root[data-theme="light"] header {
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.6) 0%, transparent 100%);
}

a{ 
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
  border-bottom: 1px solid transparent;
}

a:hover{ 
  color: var(--accent);
  border-bottom-color: var(--accent);
  opacity: 0.9;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap{ 
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg) calc(var(--spacing-2xl) * 1.5);
  position: relative;
  z-index: 1;
}

header{ 
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  position: relative;
  background: linear-gradient(to bottom, rgba(17, 17, 17, 0.4) 0%, transparent 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding-top: var(--spacing-md);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  box-shadow: var(--shadow-sm);
}

h1{ 
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  margin: 0 0 var(--spacing-md);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.nav{ 
  color: var(--muted);
  font-size: 15px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.nav a{ 
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  border-bottom: none;
}

.nav a:hover{ 
  background: var(--surface-hover);
  color: var(--text);
  border-bottom: none;
}

.nav a[aria-current="page"],
.nav a b {
  color: var(--text);
  font-weight: 600;
}

.sep{ 
  padding: 0 var(--spacing-xs);
  color: var(--muted);
  opacity: 0.5;
}

section{ 
  padding: 0 0 var(--spacing-lg) 0;
}

h2{ 
  font-size: 20px;
  margin: 0 0 var(--spacing-md);
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

h3 {
  font-size: 18px;
  margin: var(--spacing-lg) 0 var(--spacing-sm);
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
}

ul{ 
  margin: 0;
  padding-left: var(--spacing-lg);
}

li{ 
  margin: var(--spacing-sm) 0;
}

p {
  margin: var(--spacing-md) 0;
  line-height: 1.75;
}

blockquote{ 
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  padding-left: var(--spacing-xl);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: var(--radius-sm);
  color: var(--muted-light);
  font-style: italic;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, transparent 100%);
  pointer-events: none;
}

blockquote p{ 
  margin: var(--spacing-sm) 0;
}

blockquote.opening-quote {
  margin: var(--spacing-md) auto var(--spacing-md) auto;
  padding: var(--spacing-sm) 0;
  max-width: 600px;
  text-align: center;
  border-left: none;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: transparent;
  font-style: normal;
  color: var(--muted-light);
  box-shadow: none;
  position: relative;
}

blockquote.opening-quote::before {
  display: none;
}

blockquote.opening-quote p {
  font-size: 14px;
  line-height: 1.5;
  margin: 0 0 4px 0;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0;
  font-style: italic;
}

blockquote.opening-quote cite {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  font-style: normal;
  color: var(--muted);
  font-weight: 400;
}

blockquote.opening-quote cite em {
  font-style: italic;
  color: var(--muted-light);
}

footer{ 
  color: var(--muted);
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
  font-size: 14px;
}

/* Theme toggle button */
.theme-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 18px;
  box-shadow: var(--shadow-sm);
}

.theme-btn:hover{ 
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.theme-btn:active {
  transform: translateY(0);
}


/* smooth local recolor (e.g., tables) during toggle */
.theme-animating, .theme-animating *{
  transition: background-color .25s ease, border-color .25s ease, color .25s ease !important;
}

/* ===== DESKTOP: View Transitions with circular mask (2-stage) ===== */
::view-transition-group(root){ animation-timing-function: var(--reveal-ease); }
::view-transition-old(root){ animation:none; z-index:-1; }

:root[data-theme="dark"]::view-transition-new(root),
:root[data-theme="light"]::view-transition-new(root){
  -webkit-mask: radial-gradient(circle, black var(--start-size), transparent var(--start-size));
          mask: radial-gradient(circle, black var(--start-size), transparent var(--start-size));
  -webkit-mask-composite: source-in;
          mask-composite: intersect;
  -webkit-mask-position: var(--reveal-pos);
          mask-position: var(--reveal-pos);
  animation:
    vt-pop var(--pop-dur) var(--reveal-ease) both,
    vt-expand var(--expand-dur) var(--reveal-ease) var(--hold-dur) both;
}

@keyframes vt-pop{
  to{
    -webkit-mask: radial-gradient(circle, black var(--pop-size), transparent var(--pop-size));
            mask: radial-gradient(circle, black var(--pop-size), transparent var(--pop-size));
    -webkit-mask-position: var(--reveal-pos);
            mask-position: var(--reveal-pos);
  }
}

@keyframes vt-expand{
  from{
    -webkit-mask: radial-gradient(circle, black var(--pop-size), transparent var(--pop-size));
            mask: radial-gradient(circle, black var(--pop-size), transparent var(--pop-size));
    -webkit-mask-position: var(--reveal-pos);
            mask-position: var(--reveal-pos);
  }
  to{
    -webkit-mask: radial-gradient(circle, black var(--final-size), transparent var(--final-size));
            mask: radial-gradient(circle, black var(--final-size), transparent var(--final-size));
    -webkit-mask-position: var(--reveal-pos);
            mask-position: var(--reveal-pos);
  }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  ::view-transition-group(root),
  ::view-transition-new(root),
  ::view-transition-old(root){ animation:none !important; }
  
  * {
    transition: none !important;
    animation: none !important;
  }
}

/* ===== iOS FALLBACK (no View Transitions): circular reveal ===== */
@keyframes ios-disk-pop {
  from { width: var(--start-size); height: var(--start-size); }
  to   { width: var(--pop-size); height: var(--pop-size); }
}

@keyframes ios-disk-expand {
  from { width: var(--pop-size); height: var(--pop-size); }
  to   { width: var(--final-size); height: var(--final-size); }
}

/* Enhanced article list styling */
.article-list {
  list-style: none;
  padding: 0;
}

.article-list li {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.article-list li::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.3s ease;
}

.article-list li:hover {
  background: var(--surface-hover);
  border-color: var(--border-light);
  transform: translateY(-3px) translateX(4px);
  box-shadow: var(--shadow-lg);
}

.article-list li:hover::before {
  transform: scaleY(1);
}

.article-list a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  border-bottom: none;
}

.article-list a:hover {
  border-bottom: none;
}

/* Contact list styling */
.contact-list {
  list-style: none;
  padding: 0;
}

.contact-list li {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.contact-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.contact-list li:hover {
  background: var(--surface-hover);
  border-color: var(--border-light);
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

.contact-list li:hover::before {
  transform: scaleX(1);
}

.contact-list b {
  font-weight: 600;
  color: var(--text);
  margin-right: var(--spacing-sm);
}

/* Mission section styling */
.intro-box {
  margin: 0;
  padding: var(--spacing-lg) 0;
  background: transparent;
  border: none;
}

.intro-box p {
  margin: 0;
}

.mission-box {
  margin: 0;
  padding: var(--spacing-lg) 0;
  background: transparent;
  border: none;
  border-top: 1px solid var(--border);
}

.mission-box h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  font-size: 22px;
}

.mission-box p {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-md);
  position: relative;
}

.mission-box p.no-prefix {
  padding-left: 0;
}

.mission-box p:not(.no-prefix)::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

.mission-box ul {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-xl);
}

.mission-box ul li {
  margin: var(--spacing-sm) 0;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.book-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.book-cover {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-hover);
}

.book-title {
  font-size: 15px;
  line-height: 1.4;
  margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.book-author {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.team-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.team-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-hover);
  display: block;
}

.team-name {
  font-size: 16px;
  line-height: 1.4;
  margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.team-role {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.news-content {
  flex: 1;
  min-width: 0;
}

.news-card .news-date {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 var(--spacing-xs);
}

.news-card .news-headline {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 var(--spacing-sm);
  line-height: 1.3;
}

.news-card .news-body {
  margin: 0;
  color: var(--text);
}

.news-photo {
  flex: 0 0 180px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-hover);
  overflow: hidden;
}

.news-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 600px) {
  .news-card {
    flex-direction: column;
  }
  .news-photo {
    flex: 0 0 auto;
    width: 100%;
    aspect-ratio: 16 / 9;
  }
}

/* Mobile tuning */
@media (max-width: 420px){
  :root{
    --pop-size: 24vmax;
    --final-size: 120vmax;
  }
  
  .wrap {
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
  }
  
  header {
    margin-bottom: var(--spacing-lg);
  }
  
  h1 {
    font-size: 28px;
  }
  
  .nav {
    font-size: 14px;
  }
  
  body {
    font-size: 16px;
  }
}

/* Tablet adjustments */
@media (min-width: 421px) and (max-width: 768px) {
  .wrap {
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-2xl);
  }
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .theme-btn,
}