/* ============================================================
   Design system — Warm Ember, editorial-academic
   ============================================================ */
:root {
  /* Warm palette — fire research group */
  --bg:      oklch(96.5% 0.012 70);
  --surface: oklch(99% 0.006 65);
  --surface-alt: oklch(94% 0.015 65);
  --fg:      oklch(15% 0.025 50);
  --muted:   oklch(45% 0.025 55);
  --border:  oklch(86% 0.015 70);
  --accent:  oklch(52% 0.185 38);
  --accent-soft: oklch(72% 0.10 38 / 0.18);
  --accent-muted: oklch(90% 0.04 42);
  --ember:   oklch(42% 0.20 32);
  --amber:   oklch(62% 0.14 56);

  --font-display: 'Iowan Old Style', 'Palatino', Georgia, serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono:    'SF Mono', ui-monospace, Menlo, monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  --space-4xl: 128px;

  --radius: 12px;
  --radius-sm: 6px;
  --max-width: 1120px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
}
img { max-width: 100%; display: block; }
a { text-decoration: none; transition: color 0.25s, opacity 0.25s; }

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}
.section-title-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.section-title {
  font-family: var(--font-body);
  font-size: clamp(1.6rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--fg);
}
.section-title-decor {
  width: 100%;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xl);
}

/* ============================================================
   Navigation
   ============================================================ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(12% 0.02 45 / 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid oklch(35% 0.04 45 / 0.3);
}
nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: oklch(92% 0.02 70);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}
.nav-logo .logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--ember));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-display);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}
.nav-links a {
  font-size: 0.85rem;
  color: oklch(70% 0.02 65);
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.25s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width 0.3s;
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }
.nav-lang {
  font-size: 0.75rem;
  padding: 5px 12px;
  border: 1px solid oklch(50% 0.04 55);
  border-radius: 999px;
  color: oklch(70% 0.02 65);
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  transition: all 0.25s;
}
.nav-lang:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   Hero — dark warm with ember glow
   ============================================================ */
.hero {
  position: relative;
  padding: 160px 0 var(--space-2xl);
  background: oklch(10% 0.018 48);
  overflow: hidden;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}
/* Gradient bridge — smooth transition from dark hero to warm-white content */
.hero-bridge {
  height: 200px;
  background: linear-gradient(to bottom,
    oklch(10% 0.018 48) 0%,
    oklch(35% 0.07 45 / 0.48) 14%,
    oklch(55% 0.10 44 / 0.22) 26%,
    oklch(72% 0.06 48 / 0.10) 40%,
    oklch(85% 0.03 55 / 0.05) 55%,
    oklch(93% 0.015 62 / 0.03) 72%,
    oklch(96.5% 0.012 70) 100%
  );
  position: relative;
  z-index: 2;
  pointer-events: none;
  margin-top: -2px;
}
/* Ember glow line — visual anchor at the bridge bottom */
.hero-bridge-line {
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    oklch(62% 0.14 38 / 0.08) 10%,
    oklch(68% 0.16 42 / 0.35) 30%,
    oklch(72% 0.14 50 / 0.45) 50%,
    oklch(68% 0.16 42 / 0.35) 70%,
    oklch(62% 0.14 38 / 0.08) 90%,
    transparent 100%
  );
  position: relative;
  z-index: 2;
  margin-top: -1px;
  pointer-events: none;
}
/* Ember glow — warm fire illumination, enhanced */
.hero::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 120%;
  height: 60%;
  transform: translateX(-50%);
  background:
    radial-gradient(ellipse 80% 60% at 50% 100%, oklch(58% 0.24 38 / 0.55) 0%, oklch(45% 0.20 42 / 0.25) 25%, transparent 55%),
    radial-gradient(ellipse 50% 45% at 20% 100%, oklch(55% 0.22 55 / 0.35) 0%, oklch(38% 0.16 50 / 0.15) 30%, transparent 60%),
    radial-gradient(ellipse 45% 40% at 80% 100%, oklch(50% 0.24 28 / 0.30) 0%, oklch(32% 0.14 30 / 0.10) 30%, transparent 60%);
  filter: blur(8px);
  mix-blend-mode: screen;
  pointer-events: none;
  animation: glow-pulse 4s ease-in-out infinite alternate;
}
@keyframes glow-pulse {
  0%   { opacity: 0.5; transform: translateX(-50%) scale(1) translateY(0); }
  50%  { opacity: 0.8; transform: translateX(-50%) scale(1.05) translateY(-3px); }
  100% { opacity: 1; transform: translateX(-50%) scale(1.10) translateY(-6px); }
}
/* Warm ambient overlay — subtle, bottom-confined */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background:
    radial-gradient(circle at 30% 100%, oklch(70% 0.12 40 / 0.08) 0%, transparent 45%),
    radial-gradient(circle at 70% 100%, oklch(65% 0.14 55 / 0.06) 0%, transparent 45%);
  pointer-events: none;
  animation: heat-shimmer 6s ease-in-out infinite alternate;
}
@keyframes heat-shimmer {
  0%   { opacity: 0.6; }
  50%  { opacity: 1; }
  100% { opacity: 0.7; }
}
/* Scroll-down indicator — single minimal arrow */
.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  cursor: pointer;
  animation: scroll-arrive 0.8s ease-out 1.2s both;
}
.scroll-indicator .scroll-arrow {
  width: 40px;
  height: 40px;
  padding: 10px;
  border: 2px solid oklch(70% 0.10 48 / 0.5);
  border-radius: 50%;
  background: oklch(10% 0.02 48 / 0.3);
  color: oklch(75% 0.12 48);
  transition: all 0.3s;
  animation: scroll-bounce 2.4s ease-in-out infinite;
}
.scroll-indicator:hover .scroll-arrow {
  border-color: oklch(75% 0.14 48 / 0.8);
  background: oklch(15% 0.03 48 / 0.5);
}
@keyframes scroll-arrive {
  0%   { opacity: 0; transform: translateX(-50%) translateY(-12px); }
  100% { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(8px); }
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-display);
  color: oklch(75% 0.04 60);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xl);
  margin-left: auto;
  margin-right: auto;
  padding: 6px 16px;
  border: 1px solid oklch(45% 0.06 50 / 0.4);
  border-radius: 999px;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-family: var(--font-body);
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  color: oklch(93% 0.015 70);
}
.hero-line1 {
  display: block;
  font-weight: 700;
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: oklch(93% 0.015 72);
  letter-spacing: 0.03em;
  text-shadow: 0 2px 40px oklch(0% 0 0 / 0.3);
}
.hero-line-decor {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 18px auto 14px;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, oklch(62% 0.18 40 / 0.6), oklch(62% 0.14 55 / 0.2));
  border-radius: 1px;
  position: relative;
}
.hero-decor-diamond {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 7px;
  height: 7px;
  background: oklch(62% 0.18 40);
  border-radius: 1px;
  rotate: 45deg;
  box-shadow: 0 0 10px oklch(62% 0.18 40 / 0.5);
}
.hero-line2 {
  display: block;
  font-weight: 400;
  font-family: var(--font-display);
  color: oklch(68% 0.155 42);
  letter-spacing: 0.06em;
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-style: italic;
  text-shadow: 0 0 30px oklch(52% 0.185 38 / 0.3);
}
.hero-desc-wrapper {
  max-width: 680px;
  min-height: 3.5em;
  margin: 0 auto;
}
.hero-desc-block {
  display: block;
  font-size: 1.1rem;
  color: oklch(68% 0.025 60);
  line-height: 1.75;
}
.hero-desc-block + .hero-desc-block {
  margin-top: 10px;
}
.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.25s;
  border: none;
  letter-spacing: 0.02em;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--ember));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px oklch(42% 0.20 32 / 0.35);
  opacity: 1;
}
.btn-ghost {
  background: transparent;
  color: oklch(80% 0.03 65);
  border: 1px solid oklch(50% 0.05 55 / 0.5);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  opacity: 1;
}

/* Canvas fire system — replaces CSS particles + ember bed */
#ember-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* ============================================================
   About section — full-width text + horizontal direction cards
   ============================================================ */
.about-full {
  max-width: 100%;
}
.about-text {
  position: relative;
  max-width: 100%;
  margin: 0 0 var(--space-2xl);
  text-align: left;
}
.about-text p {
  color: var(--muted);
  line-height: 2;
  margin-bottom: var(--space-lg);
  font-size: 0.95rem;
  position: relative;
  z-index: 1;
}
.about-text p:first-child {
  font-size: 1.05rem;
  color: var(--fg);
}

/* About direction label + divider (centered) */
.about-dir-label {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
  margin-bottom: var(--space-sm);
  font-weight: 500;
}
.about-dir-divider {
  width: 36px;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent), var(--amber));
  border-radius: 2px;
  margin: 0 auto var(--space-2xl);
}

/* ---- Direction cards — horizontal 3-column row ---- */
.dir-cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.dir-card-h {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: all 0.35s ease;
  cursor: default;
  box-shadow: 0 2px 12px oklch(0% 0 0 / 0.03);
}
.dir-card-h:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px oklch(0% 0 0 / 0.09);
  border-color: oklch(72% 0.10 38 / 0.35);
}
.dir-card-h-img {
  width: 100%;
  height: 220px;
  position: relative;
  overflow: hidden;
  background: oklch(92% 0.015 55);
  display: flex;
  align-items: center;
  justify-content: center;
}
.dir-card-h-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 12px;
  transition: transform 0.4s ease;
}
.dir-card-h:hover .dir-card-h-img img {
  transform: scale(1.04);
}
.dir-card-h-num {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  background: oklch(42% 0.20 32 / 0.78);
  padding: 3px 9px;
  border-radius: 5px;
  letter-spacing: 0.04em;
  backdrop-filter: blur(4px);
}
.dir-card-h-body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}
.dir-card-h-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: oklch(22% 0.03 50);
  letter-spacing: 0.01em;
  line-height: 1.35;
  margin-bottom: 2px;
}
.dir-card-h-body p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.dir-card-h-tag {
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-top: 8px;
  font-weight: 500;
}

/* ============================================================
   News — magazine-style carousel with pagination
   ============================================================ */
.news-carousel {
  position: relative;
}
.news-carousel-viewport {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 2px 16px oklch(0% 0 0 / 0.03), 0 8px 32px oklch(0% 0 0 / 0.04);
  min-height: 260px;
  transition: box-shadow 0.3s;
}
.news-carousel-viewport:hover {
  box-shadow: 0 4px 24px oklch(0% 0 0 / 0.05), 0 12px 40px oklch(0% 0 0 / 0.06);
}
.news-carousel-track {
  display: flex;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}
.news-slide {
  flex: 0 0 100%;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  min-height: 260px;
}
.news-slide-image {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, oklch(92% 0.05 42), oklch(84% 0.07 55));
  display: flex;
  align-items: center;
  justify-content: center;
}
.news-slide-image .img-placeholder {
  width: 100%;
  height: 100%;
  position: relative;
}
.news-slide-image svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.news-slide-image .news-image-tag {
  position: absolute;
  bottom: var(--space-md);
  left: var(--space-md);
  padding: 3px 12px;
  border-radius: 999px;
  background: oklch(12% 0.02 45 / 0.55);
  backdrop-filter: blur(6px);
  color: oklch(80% 0.06 55);
  font-size: 0.68rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid oklch(60% 0.10 42 / 0.25);
}
.news-slide-content {
  padding: var(--space-xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}
/* Decorative left accent bar */
.news-slide-content::before {
  content: '';
  position: absolute;
  left: 0;
  top: 22%;
  bottom: 22%;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent-soft), var(--accent), var(--accent-soft), transparent);
  opacity: 0.5;
}
.news-date {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-sm);
  font-weight: 500;
}
.news-slide-content h3 {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}
.news-slide-content h3 em {
  font-style: italic;
  color: var(--accent);
}
.news-slide-content p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.75;
  max-width: 540px;
}
.news-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.news-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 0.25s;
}
.news-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: oklch(94% 0.03 45);
  transform: scale(1.05);
}
.news-btn[disabled] {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
  transform: none;
}
.news-dots {
  display: flex;
  gap: var(--space-sm);
}
.news-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: all 0.3s;
  border: none;
  padding: 0;
}
.news-dot.active {
  background: var(--accent);
  width: 22px;
  border-radius: 4px;
}
.news-counter {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

/* ============================================================
   Members
   ============================================================ */
/* ============================================================
   Members — redesigned editorial-warm
   ============================================================ */
/* PI card — distinguished editorial layout */
.member-pi {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  margin-bottom: var(--space-3xl);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px oklch(0% 0 0 / 0.03);
}
.member-pi::before {
  content: 'PI';
  position: absolute;
  top: var(--space-lg);
  left: var(--space-lg);
  z-index: 2;
  padding: 3px 14px;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.14em;
  border-radius: 4px;
}
/* Warm gradient edge at top */
.member-pi::after {
  content: '';
  position: absolute;
  top: 0;
  left: 260px;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), oklch(62% 0.14 56), transparent);
  z-index: 1;
}
.member-avatar {
  width: 260px;
  min-height: 320px;
  position: relative;
  overflow: hidden;
}
.member-avatar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, oklch(15% 0.02 50 / 0.5));
  pointer-events: none;
}
.member-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: absolute;
  inset: 0;
}
.member-info {
  padding: var(--space-2xl) var(--space-2xl) var(--space-xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
}
.member-info h3 {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.04em;
  color: oklch(18% 0.025 50);
}
.member-info .member-role {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
}
.member-info .member-bio {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.85;
  flex: 1;
}
.member-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}
.member-tag {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--accent-muted);
  color: var(--ember);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Student section dividers */
.members-section-label {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
}
.members-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-soft), transparent);
}

/* Student card grid */
.members-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}
.members-grid:last-child {
  margin-bottom: 0;
}

/* Student card — redesigned with warm accent + visual depth */
.member-card {
  position: relative;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.35s ease;
}
/* Warm top accent stripe */
.member-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), oklch(80% 0.08 44 / 0.3));
  z-index: 1;
  transition: height 0.3s ease;
}
.member-card:hover::before {
  height: 4px;
}
.member-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px oklch(0% 0 0 / 0.06), 0 4px 12px oklch(0% 0 0 / 0.03);
  border-color: oklch(78% 0.08 44 / 0.3);
}
/* Photo area with warm gradient backdrop */
.member-card-photo {
  padding: var(--space-xl) var(--space-xl) 0;
  display: flex;
  justify-content: center;
  background: linear-gradient(180deg, oklch(94% 0.02 55 / 0.4), transparent);
}
.member-photo {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 2px oklch(78% 0.08 44 / 0.2);
  transition: box-shadow 0.3s, transform 0.3s;
}
.member-card:hover .member-photo {
  box-shadow: 0 0 0 3px var(--accent-soft);
  transform: scale(1.03);
}
/* Card body */
.member-card-body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  text-align: center;
}
.member-card h4 {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 2px;
  letter-spacing: 0.04em;
  color: oklch(18% 0.025 50);
}
.member-card .member-label {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}
.member-card .member-topic {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.55;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
  margin-top: var(--space-sm);
}

/* ============================================================
   Publications
   ============================================================ */
.pub-list {
  display: flex;
  flex-direction: column;
}
.pub-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
  transition: all 0.25s;
  position: relative;
}
.pub-item:last-child {
  border-bottom: none;
}
.pub-item:hover {
  padding-left: var(--space-lg);
  margin-left: calc(-1 * var(--space-lg));
  padding-right: var(--space-lg);
  margin-right: calc(-1 * var(--space-lg));
  background: var(--surface);
  border-radius: var(--radius);
  border-bottom-color: transparent;
  box-shadow: 0 1px 4px oklch(0% 0 0 / 0.04);
}
.pub-num {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  padding-top: 3px;
  font-weight: 600;
}
.pub-content .pub-authors {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: var(--space-xs);
}
.pub-content .pub-title {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-xs);
  line-height: 1.45;
}
.pub-content .pub-venue {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.pub-year {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 4px;
  background: var(--accent-muted);
  color: var(--ember);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
}
.doi-link {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  transition: opacity 0.2s;
}
.doi-link:hover { opacity: 0.7; }

.pub-more {
  margin-top: var(--space-xl);
  text-align: center;
}
.pub-more-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--fg);
  transition: all 0.25s;
}
.pub-more-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  gap: var(--space-md);
}
.pub-more-link svg {
  transition: transform 0.25s;
}
.pub-more-link:hover svg {
  transform: translateX(4px);
}

/* ============================================================
   Recruitment
   ============================================================ */
.recruit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}
.recruit-card {
  padding: var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
}
.recruit-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.05);
}
.recruit-card h3 {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
}
.recruit-card .slots {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}
.recruit-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.75;
}
.recruit-card ul {
  list-style: none;
  margin-top: var(--space-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.recruit-card li {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.84rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.recruit-card li::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.contact-box {
  margin-top: var(--space-xl);
  padding: var(--space-2xl);
  background: linear-gradient(135deg, oklch(92% 0.03 42), oklch(93% 0.02 55));
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid oklch(86% 0.04 45 / 0.5);
}
.contact-box p {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}
.contact-email {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--ember);
  font-weight: 600;
  border-bottom: 1.5px dashed var(--accent-soft);
  padding-bottom: 2px;
}
.contact-email:hover {
  color: var(--accent);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  background: oklch(10% 0.018 48);
  padding: var(--space-xl) 0;
  border-top: 1px solid oklch(30% 0.03 45 / 0.4);
}
footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}
footer p {
  font-size: 0.8rem;
  color: oklch(55% 0.02 55);
}
footer .footer-links {
  display: flex;
  gap: var(--space-lg);
}
footer .footer-links a {
  font-size: 0.8rem;
  color: oklch(60% 0.02 55);
  transition: color 0.25s;
}
footer .footer-links a:hover {
  color: var(--accent);
}

/* ============================================================
   Section background alternation
   ============================================================ */
.section-alt {
  background: linear-gradient(180deg, oklch(97% 0.01 45) 0%, var(--surface) 40%);
}
.warm-edge {
  position: relative;
}
.warm-edge::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-soft), var(--amber), var(--accent-soft), transparent);
  opacity: 0.6;
}
.section-heat {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(180deg, oklch(92% 0.025 45 / 0.15) 0%, transparent 100%);
  pointer-events: none;
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes revealUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.anim-up {
  animation: revealUp 0.6s ease-out both;
}
/* Language switch — simple opacity fade, no float, no white flash */
[data-i18n] {
  transition: opacity 0.28s ease;
}
[data-i18n].lang-exit {
  opacity: 0.35;
}
.anim-d1 { animation-delay: 0.1s; }
.anim-d2 { animation-delay: 0.2s; }
.anim-d3 { animation-delay: 0.3s; }
.anim-d4 { animation-delay: 0.4s; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1100px) {
  .members-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
  .dir-cards-row { grid-template-columns: repeat(2, 1fr); }
  .dir-card-h-img { height: 180px; }
  .members-grid { grid-template-columns: repeat(3, 1fr); }
  .member-pi { grid-template-columns: 1fr; }
  .member-avatar { width: 100%; min-height: 240px; }
  .member-pi::after { left: 0; }
  .member-info { padding: var(--space-xl); }
  .news-slide { grid-template-columns: 220px 1fr; }
  .news-slide-image { min-height: 140px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 var(--space-3xl); }
  .members-grid { grid-template-columns: repeat(2, 1fr); }
  .dir-cards-row { grid-template-columns: 1fr; }
  .dir-card-h-img { height: 200px; }
  .member-pi { grid-template-columns: 1fr; }
  .member-avatar { width: 100%; min-height: 200px; }
  .member-info { padding: var(--space-lg); }
  .member-card-body { padding: var(--space-sm) var(--space-md) var(--space-md); }
  .member-photo { width: 80px; height: 80px; }
  .news-slide { grid-template-columns: 1fr; }
  .news-slide-image { min-height: 100px; }
  .news-slide-content { padding: var(--space-lg); }
  .recruit-grid { grid-template-columns: 1fr; }
  .recruit-card ul { grid-template-columns: 1fr; }
  .section { padding: var(--space-3xl) 0; }
  #ember-canvas { display: none; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.9rem; }
  .hero-badge { font-size: 0.7rem; }
  .news-controls { flex-wrap: wrap; gap: var(--space-md); }
}