/* ============================================================
   Design system — Warm editorial · Copper cable + fire
   ============================================================ */
:root {
  --bg:         oklch(97% 0.004 70);    /* Warm off-white canvas */
  --surface:    oklch(100% 0 0);         /* White cards */
  --surface-alt: oklch(94% 0.006 65);    /* Warm grey alternate */
  --fg:         oklch(18% 0.018 70);     /* Dark warm text */
  --muted:      oklch(52% 0.014 65);    /* Muted warm grey */
  --border:     oklch(89% 0.006 65);    /* Light warm border */
  --accent:     oklch(58% 0.14 48);     /* Copper — cable */
  --accent-soft: oklch(58% 0.14 48 / 0.12);
  --accent-muted: oklch(58% 0.14 48 / 0.06);
  --fire:       oklch(60% 0.22 32);     /* Fire orange-red */
  --amber:      oklch(72% 0.14 68);     /* Amber glow */

  --font-display: 'Iowan Old Style', 'Palatino', 'Georgia', 'Times New Roman', serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'SF Mono', 'JetBrains 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: 10px;
  --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);
  overflow-y: auto;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; transition: color 0.25s; }


/* ============================================================
   Navigation
   ============================================================ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(100% 0 0 / 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
nav .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.nav-logo .logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 3px solid var(--accent);
  flex-shrink: 0;
}
.nav-logo .logo-mark::before {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.25;
}
.nav-logo .logo-mark::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 4px var(--accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}
.nav-links a {
  font-size: 0.85rem;
  color: var(--muted);
  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: 2px;
  background: var(--accent);
  transition: width 0.3s;
  border-radius: 1px;
}
.nav-links a:hover { color: var(--fg); }
.nav-links a:hover::after { width: 100%; }
.nav-lang {
  font-size: 0.75rem;
  padding: 5px 14px;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  transition: all 0.25s;
  background: transparent;
  cursor: pointer;
}
.nav-lang:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   Hero — warm editorial with cable motif
   ============================================================ */
.hero {
  position: relative;
  padding: 140px 0 100px;
  background:
    linear-gradient(180deg,
      oklch(97% 0.006 60) 0%,
      oklch(96% 0.008 55) 30%,
      oklch(95% 0.01 50) 60%,
      oklch(94% 0.012 45) 85%,
      oklch(93% 0.014 40) 100%
    );
  overflow: hidden;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Cable cross-section pattern overlay — very subtle */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background:
    radial-gradient(circle at 50% 50%, transparent 44%, var(--accent) 44%, transparent 46%),
    radial-gradient(circle at 50% 50%, transparent 2px, oklch(0% 0 0 / 0.5) 2px, transparent 3px);
  background-size: 80px 80px, 14px 14px;
  background-position: 0 0, 40px 40px;
  pointer-events: none;
  mix-blend-mode: multiply;
}

/* Warm ambient glow at bottom */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background:
    radial-gradient(ellipse 70% 50% at 50% 100%, oklch(68% 0.18 38 / 0.2) 0%, transparent 60%),
    radial-gradient(ellipse 50% 35% at 30% 100%, oklch(72% 0.14 55 / 0.1) 0%, transparent 55%),
    radial-gradient(ellipse 40% 30% at 70% 100%, oklch(65% 0.20 28 / 0.08) 0%, transparent 55%);
  pointer-events: none;
  mix-blend-mode: multiply;
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: left;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-body);
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xl);
  padding: 5px 16px;
  background: oklch(100% 0 0 / 0.6);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.hero-badge .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--fire);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  margin-bottom: var(--space-lg);
}
.hero-line1 {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5.5vw, 4.5rem);
  font-weight: 700;
  color: var(--fg);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.hero-line-decor {
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--amber));
  border-radius: 2px;
  margin: var(--space-lg) 0;
}
.hero-line2 {
  display: inline-block;
  font-family: var(--font-body);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.hero-desc-wrapper {
  max-width: 640px;
  margin-top: var(--space-xl);
}
.hero-desc-block {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.8;
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  cursor: pointer;
  animation: scroll-arrive 0.8s ease-out 1.5s both;
}
.scroll-indicator .scroll-arrow {
  width: 38px;
  height: 38px;
  padding: 9px;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  background: oklch(100% 0 0 / 0.7);
  color: var(--accent);
  transition: all 0.3s;
  animation: scroll-bounce 2.4s ease-in-out infinite;
}
.scroll-indicator:hover .scroll-arrow {
  border-color: var(--accent);
  background: #fff;
  color: var(--fire);
}
@keyframes scroll-arrive {
  0%   { opacity: 0; transform: translateX(-50%) translateY(-16px); }
  100% { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(8px); }
}

/* ============================================================
   Sections — common
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}
.section-title {
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-lg);
}
.section-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.section-title-decor {
  width: 100%;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent), var(--amber));
  border-radius: 2px;
  margin-bottom: var(--space-2xl);
}

/* ============================================================
   About section — editorial layout
   ============================================================ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}
.about-intro p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.9;
}
.about-intro p:first-child {
  font-size: 1rem;
  color: var(--fg);
}

.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;
}
.dir-card-h:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px oklch(0% 0 0 / 0.06);
  border-color: var(--accent-soft);
}
.dir-card-h-img {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
  background: var(--surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
}
.dir-card-h-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-lg);
  transition: transform 0.4s ease;
}
.dir-card-h:hover .dir-card-h-img img {
  transform: scale(1.03);
}
.dir-card-h-num {
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}
.dir-card-h-body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.dir-card-h-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.01em;
  line-height: 1.35;
}
.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: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-top: 6px;
  font-weight: 500;
}

/* ============================================================
   Section alternation
   ============================================================ */
.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ============================================================
   News — chronicle / timeline layout
   ============================================================ */
.news-timeline {
  position: relative;
  padding-left: 28px;
}
.tl-item {
  position: relative;
  padding-bottom: var(--space-2xl);
}
.tl-item:last-child {
  padding-bottom: 0;
}
.tl-marker {
  position: absolute;
  left: -28px;
  top: 0;
  bottom: 0;
  width: 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2.5px solid var(--surface);
  box-shadow: 0 0 0 2px var(--accent-soft);
  flex-shrink: 0;
  z-index: 1;
  transition: box-shadow 0.3s, transform 0.3s;
}
.tl-item:hover .tl-dot {
  box-shadow: 0 0 0 3px var(--accent-soft), 0 0 12px var(--accent-soft);
  transform: scale(1.15);
}
.tl-line {
  width: 2px;
  flex: 1;
  background: linear-gradient(180deg, var(--accent-soft), transparent);
  margin-top: 3px;
}
.tl-item:last-child .tl-line {
  display: none;
}
.tl-date {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
  font-weight: 500;
  text-transform: uppercase;
}
.tl-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.55;
  margin-bottom: 6px;
  color: var(--fg);
}
.tl-title em {
  font-style: italic;
  color: var(--accent);
}
.tl-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.75;
  max-width: 620px;
}

/* ============================================================
   Members
   ============================================================ */
.member-pi {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3xl);
  overflow: hidden;
  box-shadow: 0 2px 12px oklch(0% 0 0 / 0.04);
}
.member-pi-accent {
  height: 3px;
  grid-column: 1 / -1;
  background: linear-gradient(90deg, var(--accent), var(--amber), transparent);
}
.member-avatar {
  width: 240px;
  min-height: 300px;
  position: relative;
  overflow: hidden;
}
.member-avatar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, oklch(100% 0 0 / 0.15));
  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);
  display: flex;
  flex-direction: column;
}
.member-info h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.02em;
  color: var(--fg);
}
.member-role {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: var(--space-md);
}
.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(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.members-section-label {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: var(--space-lg);
}
.members-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-soft), transparent);
}

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

.member-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.member-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.06);
  border-color: var(--accent-soft);
}
.member-card-photo {
  padding: var(--space-xl) var(--space-xl) 0;
  display: flex;
  justify-content: center;
  background: linear-gradient(180deg, var(--surface-alt) 0%, transparent);
}
.member-photo {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--border);
  transition: box-shadow 0.3s;
}
.member-card:hover .member-photo {
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.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: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
  color: var(--fg);
}
.member-card .member-label {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-sm);
}
.member-card .member-topic {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
  margin-top: var(--space-sm);
}

/* ============================================================
   Publications — year-grouped reference style
   ============================================================ */
.pub-year-group {
  margin-bottom: var(--space-2xl);
}
.pub-year-group:last-child {
  margin-bottom: 0;
}
.pub-year-h {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.pub-year-h::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-soft), transparent);
}
.pub-items {
  display: flex;
  flex-direction: column;
}
.pub-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  display: block;
}
.pub-item:last-child {
  border-bottom: none;
}
.pub-item:last-child {
  border-bottom: none;
}
.pub-item:hover {
  background: var(--surface);
  margin: 0 calc(-1 * var(--space-lg));
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
  border-radius: var(--radius-sm);
  border-bottom-color: transparent;
}
.pub-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  padding-top: 3px;
  font-weight: 500;
}
.pub-authors {
  font-size: 0.82rem;
  color: var(--muted);
  display: block;
  margin-bottom: 2px;
}
.pub-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.01em;
  line-height: 1.45;
  display: block;
  margin-bottom: 2px;
}
.pub-journal {
  font-size: 0.8rem;
  color: var(--muted);
}
.pub-journal em {
  font-style: italic;
  color: var(--accent);
}
.doi-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  margin-left: var(--space-sm);
  transition: opacity 0.2s;
}
.doi-link:hover { opacity: 0.7; }

/* ============================================================
   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-soft);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.06);
}
.recruit-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--fg);
}
.recruit-card .slots {
  font-family: var(--font-display);
  font-size: 1.8rem;
  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);
  border: 1px solid var(--border);
}
.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: var(--surface-alt);
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
}
.contact-box p {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}
.contact-email {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 600;
  border-bottom: 1.5px dashed var(--accent-soft);
  padding-bottom: 2px;
  transition: color 0.25s;
}
.contact-email:hover {
  color: var(--fire);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  background: var(--surface);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}
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: var(--muted);
}
footer .footer-links {
  display: flex;
  gap: var(--space-lg);
}
footer .footer-links a {
  font-size: 0.8rem;
  color: var(--muted);
  transition: color 0.25s;
}
footer .footer-links a:hover {
  color: var(--accent);
}

@keyframes revealUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.anim-up {
  animation: revealUp 0.6s ease-out both;
}
[data-i18n] {
  transition: opacity 0.28s ease;
}
[data-i18n].lang-exit {
  opacity: 0;
}
.anim-d1 { animation-delay: 0.1s; }
.anim-d2 { animation-delay: 0.2s; }
.anim-d3 { animation-delay: 0.3s; }
.anim-d4 { animation-delay: 0.4s; }

/* ============================================================
   Scroll reveal
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .dir-cards-row { grid-template-columns: repeat(2, 1fr); }
  .members-grid { grid-template-columns: repeat(2, 1fr); }
  .member-pi { grid-template-columns: 1fr; }
  .member-avatar { width: 100%; min-height: 220px; }
  .member-info { padding: var(--space-xl); }
  .about-intro { grid-template-columns: 1fr; gap: var(--space-md); }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 100px 0 80px; min-height: auto; }
  .members-grid { grid-template-columns: repeat(2, 1fr); }
  .dir-cards-row { grid-template-columns: 1fr; }
  .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; }
  .recruit-grid { grid-template-columns: 1fr; }
  .recruit-card ul { grid-template-columns: 1fr; }
  .section { padding: var(--space-3xl) 0; }
}
@media (max-width: 480px) {
  .hero-line1 { font-size: 1.8rem; }
  .hero-line2 { font-size: 1rem; }
  .hero-desc-block { font-size: 0.9rem; }
}