:root {
  --navy: #012169;
  --red:  #C84B31;
  --gold: #D4AF5A;
  --ink:  #0D0D0D;
  --mist: #F5F3EF;
  --mid:  #8A8880;
  --rule: rgba(1,33,105,0.12);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'DM Sans', sans-serif; background: var(--mist); color: var(--ink); overflow-x: hidden; }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 48px;
  background: rgba(245,243,239,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.nav-brand { display: flex; align-items: center; gap: 16px; }
.nav-logo { font-family: 'Playfair Display', serif; font-size: 20px; font-weight: 700; color: var(--navy); letter-spacing: -0.02em; text-decoration: none; }
.nav-logo span { color: var(--red); }
.lang-toggle { display: flex; align-items: center; font-size: 12px; letter-spacing: 0.05em; color: var(--mid); cursor: pointer; padding: 6px 10px; border: 1px solid var(--rule); border-radius: 3px; background: transparent; transition: all 0.2s; }
.lang-toggle:hover { color: var(--navy); border-color: var(--navy); }
.lang-toggle .lang-option { transition: opacity 0.2s; }
.lang-toggle .lang-option.active { font-weight: 600; color: var(--navy); }
.lang-toggle .lang-divider { margin: 0 6px; opacity: 0.4; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a { font-size: 13px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--navy); text-decoration: none; opacity: 0.7; transition: opacity 0.2s; }
.nav-links a:hover, .nav-links a.active { opacity: 1; }
.nav-cta { background: var(--red); color: #fff; padding: 10px 22px; border-radius: 2px; font-size: 13px; font-weight: 500; letter-spacing: 0.04em; text-decoration: none; transition: background 0.2s; }
.nav-cta:hover { background: #a83a22; }

.hero { min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; padding-top: 80px; }
.hero-left { display: flex; flex-direction: column; justify-content: center; padding: 80px 48px 80px 72px; }
.hero-eyebrow { font-family: 'DM Mono', monospace; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--red); margin-bottom: 28px; display: flex; align-items: center; gap: 12px; animation: fadeUp 0.6s ease both; }
.hero-eyebrow::after { content: ''; flex: 1; max-width: 60px; height: 1px; background: var(--red); opacity: 0.5; }
.hero-title { font-family: 'Playfair Display', serif; font-size: clamp(52px, 6vw, 88px); font-weight: 900; line-height: 0.95; letter-spacing: -0.03em; color: var(--navy); margin-bottom: 32px; animation: fadeUp 0.6s ease 0.1s both; }
.hero-title em { font-style: italic; color: var(--red); display: block; }
.hero-sub { font-size: 17px; font-weight: 300; line-height: 1.65; color: #3a3a3a; max-width: 420px; margin-bottom: 48px; animation: fadeUp 0.6s ease 0.2s both; }
.hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; animation: fadeUp 0.6s ease 0.3s both; }
.btn-primary { background: var(--navy); color: #fff; padding: 16px 32px; border-radius: 2px; font-size: 14px; font-weight: 500; letter-spacing: 0.04em; text-decoration: none; transition: background 0.2s; display: inline-block; }
.btn-primary:hover { background: #01317f; }
.btn-ghost { color: var(--navy); border-bottom: 1.5px solid var(--navy); padding-bottom: 2px; font-size: 14px; font-weight: 500; text-decoration: none; letter-spacing: 0.02em; transition: opacity 0.2s; }
.btn-ghost:hover { opacity: 0.6; }

.hero-right { background: #FAF8F4; display: flex; flex-direction: column; justify-content: space-between; padding: 60px 56px; position: relative; overflow: hidden; border-left: 1px solid var(--rule); }
.hero-logo { position: relative; z-index: 1; display: flex; justify-content: center; align-items: flex-start; padding-top: 0; margin-bottom: 40px; animation: fadeUp 0.6s ease 0.1s both; }
.hero-logo img { width: 220px; height: 220px; object-fit: cover; border-radius: 50%; box-shadow: 0 8px 32px rgba(0,0,0,0.1); }
.hero-pattern { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background-image: repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(1,33,105,0.03) 39px, rgba(1,33,105,0.03) 40px), repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(1,33,105,0.03) 39px, rgba(1,33,105,0.03) 40px); }
.hero-stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; position: relative; z-index: 1; margin-bottom: 48px; animation: fadeUp 0.7s ease 0.2s both; }
.stat-block { border-left: 2px solid var(--gold); padding-left: 18px; }
.stat-num { font-family: 'Playfair Display', serif; font-size: 48px; font-weight: 700; line-height: 1; color: var(--ink); letter-spacing: -0.03em; }
.stat-label { font-size: 12px; font-weight: 400; letter-spacing: 0.06em; text-transform: uppercase; color: var(--mid); margin-top: 6px; }
.hero-quote { position: relative; z-index: 1; border-top: 1px solid var(--rule); padding-top: 28px; font-family: 'Playfair Display', serif; font-size: 18px; font-style: italic; line-height: 1.5; color: var(--ink); animation: fadeUp 0.7s ease 0.35s both; }

.page-hero { padding: 140px 72px 40px; text-align: center; }
.page-hero .section-label { margin-bottom: 16px; }
.page-hero .section-title { margin-bottom: 16px; }
.page-hero-sub { font-size: 17px; font-weight: 300; line-height: 1.65; color: #3a3a3a; max-width: 600px; margin: 0 auto; }

section { padding: 100px 72px; }
.section-label { font-family: 'DM Mono', monospace; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--red); margin-bottom: 20px; }
.section-title { font-family: 'Playfair Display', serif; font-size: clamp(36px, 4vw, 56px); font-weight: 900; line-height: 1.05; letter-spacing: -0.03em; color: var(--navy); margin-bottom: 20px; }

.about { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.about-body { font-size: 16px; font-weight: 300; line-height: 1.8; color: #3a3a3a; margin-bottom: 24px; }
.about-right { padding-top: 0; }
.pillars { display: flex; flex-direction: column; }
.pillar { display: flex; gap: 24px; align-items: flex-start; padding: 28px 0; border-bottom: 1px solid var(--rule); opacity: 0; transform: translateY(16px); transition: opacity 0.5s, transform 0.5s; }
.pillar.visible { opacity: 1; transform: translateY(0); }
.pillar-num { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--red); padding-top: 4px; min-width: 28px; }
.pillar h3 { font-size: 15px; font-weight: 500; color: var(--navy); margin-bottom: 6px; }
.pillar p { font-size: 14px; font-weight: 300; line-height: 1.65; color: #555; }

.exec-section { background: #fff; }
.exec-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; margin-top: 48px; }
.exec-card { position: relative; overflow: hidden; aspect-ratio: 3/4; cursor: pointer; }
.exec-card img { width: 100%; height: 100%; object-fit: cover; transition: opacity 0.3s ease; }
.exec-card:hover img { opacity: 0.3; }
.exec-blank { width: 100%; height: 100%; background: #e8e5df; }
body.dark .exec-blank { background: #2a2a30; }
.exec-overlay { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 24px; opacity: 0; transition: opacity 0.3s ease; }
.exec-card:hover .exec-overlay { opacity: 1; }
.exec-name { font-family: 'Playfair Display', serif; font-size: 24px; font-weight: 600; color: var(--navy); margin-bottom: 12px; }
.exec-role { font-family: 'Playfair Display', serif; font-size: 20px; letter-spacing: 0.02em; color: var(--red); margin-bottom: 12px; font-weight: 700; font-style: italic; }
.exec-year { font-size: 15px; font-weight: 400; color: var(--navy); margin-bottom: 4px; }
.exec-major { font-size: 14px; font-weight: 300; color: var(--mid); line-height: 1.5; }

.alumni-section { background: var(--navy); color: #fff; }
.alumni-section .section-label { color: var(--gold); }
.alumni-section .section-title { color: #fff; }
.alumni-intro { font-size: 16px; font-weight: 300; line-height: 1.8; color: rgba(255,255,255,0.65); max-width: 560px; margin-bottom: 56px; }
.alumni-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 2px; margin-bottom: 56px; }
.alumni-card { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); padding: 28px 24px; transition: background 0.2s; }
.alumni-card:hover { background: rgba(255,255,255,0.08); }
.alumni-name { font-size: 15px; font-weight: 500; color: #fff; margin-bottom: 4px; }
.alumni-class { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--gold); letter-spacing: 0.06em; margin-bottom: 12px; }
.alumni-role { font-size: 13px; font-weight: 300; color: rgba(255,255,255,0.55); line-height: 1.5; }
.alumni-company { font-size: 13px; font-weight: 500; color: rgba(255,255,255,0.8); }
.alumni-badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.alumni-badge { font-family: 'DM Mono', monospace; font-size: 10px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--gold); border: 1px solid rgba(212,175,90,0.35); padding: 3px 8px; border-radius: 2px; }
.alumni-linkedin { display: inline-block; margin-top: 10px; font-size: 12px; font-weight: 500; color: rgba(255,255,255,0.45); text-decoration: none; letter-spacing: 0.04em; transition: color 0.2s; }
.alumni-linkedin:hover { color: rgba(255,255,255,0.85); }
.alumni-cta-block { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 48px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.alumni-cta-text { font-family: 'Playfair Display', serif; font-size: 22px; font-style: italic; color: rgba(255,255,255,0.8); max-width: 420px; line-height: 1.4; }
.btn-gold { background: var(--gold); color: var(--navy); padding: 16px 32px; border-radius: 2px; font-size: 14px; font-weight: 500; letter-spacing: 0.04em; text-decoration: none; transition: opacity 0.2s; white-space: nowrap; display: inline-block; }
.btn-gold:hover { opacity: 0.85; }

.events-section { padding: 100px 72px; }
.events-inner { display: grid; grid-template-columns: 1fr 2fr; gap: 80px; }
.event-list { display: flex; flex-direction: column; }
.event-item { display: flex; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--rule); transition: opacity 0.2s; }
.event-item:hover { opacity: 0.7; }
.event-date { min-width: 52px; font-family: 'Playfair Display', serif; font-size: 32px; font-weight: 700; line-height: 1; color: var(--red); letter-spacing: -0.03em; }
.event-month { font-family: 'DM Mono', monospace; font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--mid); display: block; }
.event-title { font-size: 15px; font-weight: 500; color: var(--navy); margin-bottom: 4px; }
.event-desc { font-size: 13px; font-weight: 300; color: var(--mid); line-height: 1.5; }
.events-feature { background: var(--navy); border-radius: 4px; padding: 48px; display: flex; flex-direction: column; justify-content: space-between; min-height: 360px; position: relative; overflow: hidden; }
.events-feature-tag { font-family: 'DM Mono', monospace; font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gold); margin-bottom: 16px; }
.events-feature-title { font-family: 'Playfair Display', serif; font-size: 32px; font-weight: 700; line-height: 1.15; color: #fff; max-width: 280px; }
.events-feature-body { font-size: 14px; font-weight: 300; line-height: 1.65; color: rgba(255,255,255,0.6); max-width: 320px; }
.feature-deco { position: absolute; right: -20px; bottom: -20px; width: 160px; height: 160px; border-radius: 50%; background: rgba(212,175,90,0.08); }

.join { background: #fff; }
.join-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.join-body { font-size: 16px; font-weight: 300; line-height: 1.8; color: #3a3a3a; margin-bottom: 32px; }
.join-form-block { background: var(--mist); border: 1px solid var(--rule); padding: 40px; border-radius: 4px; }
.form-title { font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 700; color: var(--navy); margin-bottom: 8px; }
.form-sub { font-size: 13px; color: var(--mid); margin-bottom: 28px; font-weight: 300; line-height: 1.5; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--navy); margin-bottom: 8px; }
.form-group input, .form-group select { width: 100%; padding: 12px 16px; border: 1px solid rgba(1,33,105,0.2); border-radius: 2px; background: #fff; font-family: 'DM Sans', sans-serif; font-size: 14px; color: var(--ink); outline: none; transition: border-color 0.2s; }
.form-group input:focus, .form-group select:focus { border-color: var(--navy); }
.form-note { font-size: 12px; color: var(--mid); margin-top: 16px; line-height: 1.5; }
.btn-submit { width: 100%; background: var(--red); color: #fff; padding: 16px; border: none; border-radius: 2px; cursor: pointer; font-family: 'DM Sans', sans-serif; font-size: 14px; font-weight: 500; letter-spacing: 0.04em; margin-top: 20px; transition: background 0.2s; }
.btn-submit:hover { background: #a83a22; }

footer { background: var(--ink); color: rgba(255,255,255,0.4); padding: 48px 72px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; }
.footer-logo { font-family: 'Playfair Display', serif; font-size: 18px; font-weight: 700; color: #fff; text-decoration: none; }
.footer-logo span { color: var(--red); }
.footer-links { display: flex; gap: 28px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,0.4); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: rgba(255,255,255,0.8); }
.footer-copy { font-size: 12px; width: 100%; text-align: center; margin-top: 8px; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* ── Dark mode (Chinese language) ── */
body.dark {
  --mist: #0f0f12;
  --ink: #e8e6e1;
  --rule: rgba(255,255,255,0.08);
  --mid: #888;
  background: var(--mist);
  color: var(--ink);
  transition: background 0.3s, color 0.3s;
}
body.dark nav { background: rgba(15,15,18,0.92); border-bottom-color: var(--rule); }
body.dark .nav-logo { color: #e8e6e1; }
body.dark .nav-links a { color: #e8e6e1; }
body.dark .nav-cta { background: var(--red); }
body.dark .lang-toggle { color: #888; border-color: var(--rule); }
body.dark .lang-toggle:hover { color: #e8e6e1; border-color: rgba(255,255,255,0.3); }
body.dark .lang-toggle .lang-option.active { color: #e8e6e1; }
body.dark .hero-left { background: var(--mist); }
body.dark .hero-right { background: #FAF8F4; border-left-color: rgba(1,33,105,0.12); }
body.dark .stat-num { color: #012169; }
body.dark .stat-label { color: #8A8880; }
body.dark .stat-block { border-left-color: var(--gold); }
body.dark .hero-quote { color: #012169; border-top-color: rgba(1,33,105,0.12); }
body.dark .hero-title { color: #e8e6e1; }
body.dark .hero-sub { color: #aaa; }
body.dark .hero-eyebrow { color: var(--red); }
body.dark .btn-primary { background: var(--navy); }
body.dark .btn-ghost { color: #e8e6e1; border-color: #e8e6e1; }
body.dark .page-hero { background: var(--mist); }
body.dark .section-title { color: #e8e6e1; }
body.dark .about-body, body.dark .join-body { color: #aaa; }
body.dark .pillar { border-bottom-color: var(--rule); }
body.dark .pillar h3 { color: #e8e6e1; }
body.dark .pillar p { color: #888; }
body.dark .exec-section { background: #18181c; }
body.dark .exec-name { color: #e8e6e1; }
body.dark .exec-year { color: #e8e6e1; }
body.dark .join { background: #18181c; }
body.dark .join-form-block { background: #1e1e24; border-color: var(--rule); }
body.dark .form-title { color: #e8e6e1; }
body.dark .form-sub { color: #888; }
body.dark .form-group label { color: #e8e6e1; }
body.dark .form-group input, body.dark .form-group select { background: #0f0f12; border-color: rgba(255,255,255,0.12); color: #e8e6e1; }
body.dark .form-group input:focus, body.dark .form-group select:focus { border-color: rgba(255,255,255,0.4); }
body.dark .form-note { color: #666; }
body.dark .events-section { background: var(--mist); }
body.dark .event-item { border-bottom-color: var(--rule); }
body.dark .event-title { color: #e8e6e1; }
body.dark .event-desc { color: #888; }
body.dark .mobile-menu { background: #0f0f12; }
body.dark .mobile-menu a { color: #e8e6e1; }
body.dark footer { background: #080809; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--navy); border-radius: 2px; transition: all 0.25s; }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: var(--mist); z-index: 99; flex-direction: column; justify-content: center; align-items: center; gap: 36px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { font-family: 'Playfair Display', serif; font-size: 32px; font-weight: 700; color: var(--navy); text-decoration: none; letter-spacing: -0.02em; transition: color 0.2s; }
.mobile-menu a:hover { color: var(--red); }
.mobile-menu .mobile-cta { font-family: 'DM Sans', sans-serif; font-size: 14px; font-weight: 500; letter-spacing: 0.04em; background: var(--red); color: #fff; padding: 14px 32px; border-radius: 2px; margin-top: 8px; }
.mobile-menu .mobile-cta:hover { background: #a83a22; color: #fff; }

@media (max-width: 900px) {
  nav { padding: 16px 24px; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .hamburger { display: flex; }
  .hero { grid-template-columns: 1fr; }
  .hero-left { padding: 60px 24px 48px; }
  .hero-right { display: none; }
  .hero-logo-mobile { display: flex; justify-content: center; margin-bottom: 32px; animation: fadeUp 0.6s ease both; }
  .hero-logo-mobile img { width: 160px; height: 160px; object-fit: cover; border-radius: 50%; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
  section, .events-section { padding: 64px 24px; }
  .page-hero { padding: 120px 24px 60px; }
  .about, .events-inner, .join-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-right { padding-top: 0; }
  footer { padding: 40px 24px; }
}
.hero-logo-mobile { display: none; }