/* ===================================================================
   BUGCC · Boston University Global China Connection
   品牌色：深红 #A6182A / 米白 #FBF3D9 / 暖白 #FFFCF2
   ================================================================ */

:root {
  --red:        #A6182A;
  --red-dark:   #7E0F1E;
  --red-deep:   #5C0A15;
  --cream:      #FBF3D9;
  --cream-soft: #FFFCF2;
  --gold:       #E8C547;
  --ink:        #1A1A1A;
  --ink-soft:   #4A4A4A;
  --line:       rgba(166, 24, 42, 0.15);

  --font-cn:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-en:    'Inter', system-ui, sans-serif;
  --font-serif: 'Cormorant Garamond', 'Times New Roman', serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(166, 24, 42, 0.08);
  --shadow-lg: 0 20px 60px rgba(166, 24, 42, 0.15);
}

/* ============ Reset ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--cream-soft);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.7; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ============ Navigation ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 252, 242, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow 0.3s, background 0.3s;
}
.nav--scrolled {
  background: rgba(255, 252, 242, 0.95);
  box-shadow: 0 2px 20px rgba(0,0,0,0.04);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.nav__logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
}
.nav__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav__logo {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  color: var(--red);
  letter-spacing: 0.5px;
}
.nav__sub { font-size: 10px; color: var(--ink-soft); letter-spacing: 0.5px; }

.nav__links { display: flex; gap: 32px; align-items: center; }
.nav__links a { font-size: 15px; font-weight: 500; color: var(--ink); }
.nav__links a:hover { color: var(--red); opacity: 1; }
.nav__cta {
  background: var(--red);
  color: var(--cream-soft) !important;
  padding: 10px 20px;
  border-radius: 999px;
  transition: background 0.2s, transform 0.2s;
}
.nav__cta:hover { background: var(--red-dark); transform: translateY(-1px); opacity: 1 !important; }

.nav__toggle {
  display: none;
  background: none; border: none;
  font-size: 24px; cursor: pointer;
  color: var(--red);
}

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100vh;
  background: var(--cream);
  overflow: hidden;
  padding-top: 72px;
}
.hero__bg {
  position: absolute;
  top: 0; right: 0;
  width: 45%;
  height: 100%;
  background: var(--red);
  z-index: 0;
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 24px;
  border: 2px solid rgba(255, 252, 242, 0.3);
  border-radius: var(--radius-md);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding-top: 40px;
  padding-bottom: 40px;
}
.hero__text { max-width: 540px; }
.hero__eyebrow {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--red);
  margin-bottom: 24px;
}
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  letter-spacing: -1px;
  margin-bottom: 20px;
}
.hero__title-cn {
  display: block;
  font-family: var(--font-cn);
  font-size: 0.42em;
  font-weight: 700;
  margin-top: 8px;
  letter-spacing: 0;
}
.hero__tagline {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--red-dark);
  margin-bottom: 32px;
}
.hero__lede {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 40px;
}
.hero__cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__seal {
  display: flex;
  justify-content: center;
  align-items: center;
  /* 让 logo 居中在右侧红色背景块上（红色块占页面右 45%，右列占 grid 右侧 45.5%）*/
  padding-right: 0;
  transform: translateX(14%);
}

/* Hero 印章 — 直接用 logo 图 */
.hero__seal-img {
  width: 320px;
  height: 320px;
  object-fit: contain;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,0.18));
  animation: seal-float 6s ease-in-out infinite;
}
@keyframes seal-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--red);
  opacity: 0.6;
  animation: bob 2s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 14px 28px;
  font-family: var(--font-cn);
  font-size: 15px;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s;
  border: 2px solid transparent;
}
.btn--primary {
  background: var(--red);
  color: var(--cream-soft);
}
.btn--primary:hover { background: var(--red-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); opacity: 1; }
.btn--ghost {
  background: transparent;
  color: var(--red);
  border-color: var(--red);
}
.btn--ghost:hover { background: var(--red); color: var(--cream-soft); opacity: 1; }
.btn--outline {
  background: transparent;
  color: var(--cream-soft);
  border-color: var(--cream-soft);
}
.btn--outline:hover { background: var(--cream-soft); color: var(--red); opacity: 1; }
.btn--large { padding: 18px 36px; font-size: 17px; }

/* ============ Sections shared ============ */
.section {
  padding: 120px 0;
  position: relative;
}
.section--cream { background: var(--cream-soft); }
.section--red {
  background: var(--red);
  color: var(--cream-soft);
}
.section--red::before {
  content: '';
  position: absolute;
  inset: 60px 32px;
  border: 1px solid rgba(255, 252, 242, 0.15);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.section__head {
  text-align: center;
  margin-bottom: 80px;
}
.section__head--light { color: var(--cream-soft); }
.eyebrow {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--red);
  margin-bottom: 16px;
}
.section--red .eyebrow { color: var(--gold); }

.section__title {
  font-family: var(--font-cn);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section__sub {
  font-size: 17px;
  opacity: 0.85;
  max-width: 600px;
  margin: 0 auto;
}

/* ============ About ============ */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 80px;
  align-items: center;
}
.about__text p {
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink);
  margin-bottom: 20px;
}
.about__text strong { color: var(--red); font-weight: 700; }
.about__text em {
  font-style: normal;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--red);
  text-underline-offset: 4px;
}
.about__text mark {
  background: linear-gradient(180deg, transparent 60%, rgba(232, 197, 71, 0.5) 60%);
  padding: 0 2px;
}
.about__motto {
  margin-top: 32px;
  padding: 20px 28px;
  background: var(--red);
  color: var(--cream-soft);
  border-radius: var(--radius-md);
  display: inline-flex;
  gap: 16px;
  font-family: var(--font-serif);
  font-size: 24px;
  font-style: italic;
}
.about__motto-mark { opacity: 0.5; }

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.stat {
  background: var(--cream);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--line);
  transition: transform 0.3s, box-shadow 0.3s;
}
.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.stat__num {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--red);
  line-height: 1;
}
.stat__label {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 8px;
}

/* ============ EB ============ */
.eb__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.eb-card {
  background: rgba(255, 252, 242, 0.06);
  border: 1px solid rgba(255, 252, 242, 0.15);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: all 0.3s;
}
.eb-card:hover {
  background: rgba(255, 252, 242, 0.1);
  border-color: rgba(255, 252, 242, 0.3);
  transform: translateY(-4px);
}
.eb-card--featured {
  grid-column: span 2;
  background: var(--cream-soft);
  color: var(--ink);
  border-color: transparent;
}
.eb-card--featured:hover {
  background: var(--cream);
  transform: translateY(-4px);
}
.eb-card__role {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  opacity: 0.6;
  margin-bottom: 12px;
}
.eb-card__name {
  font-size: 28px;
  font-weight: 900;
  margin-bottom: 12px;
}
.eb-card__name span {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  opacity: 0.5;
  margin-left: 8px;
}
.eb-card__desc {
  font-size: 15px;
  opacity: 0.85;
  margin-bottom: 20px;
}
.eb-card__members {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.eb-card__members li {
  padding: 6px 14px;
  background: rgba(255, 252, 242, 0.1);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
}
.eb-card--featured .eb-card__members li {
  background: rgba(166, 24, 42, 0.1);
  color: var(--red);
}
.eb__note {
  text-align: center;
  margin-top: 48px;
  font-size: 15px;
  opacity: 0.8;
}
.link-light {
  color: var(--gold);
  border-bottom: 1px solid currentColor;
}

/* ============ Departments ============ */
.dept-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.dept {
  padding: 40px;
  background: var(--cream);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--red);
  transition: transform 0.3s, box-shadow 0.3s;
}
.dept:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}
.dept--link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  position: relative;
}
.dept--link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.dept__more {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--red);
  opacity: 0.85;
  transition: transform 0.3s, opacity 0.3s;
}
.dept--link:hover .dept__more {
  transform: translateX(6px);
  opacity: 1;
}
.dept__num {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--red);
  opacity: 0.5;
  margin-bottom: 12px;
}
.dept h3 {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--ink);
}
.dept__en {
  display: block;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 600;
  color: var(--red);
  opacity: 0.7;
  margin-top: 4px;
  letter-spacing: 0.5px;
}
.dept p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* ---- Expanded department card (AF) ---- */
.dept--expanded {
  grid-column: 1 / -1;
  border-left-width: 6px;
}
.dept__lead {
  font-size: 16px !important;
  margin-bottom: 28px;
}
.dept__lead strong {
  color: var(--ink);
  background: linear-gradient(transparent 60%, rgba(255, 220, 80, 0.5) 60%);
  padding: 0 2px;
}
.dept__sub-title {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--ink);
  background: #C9E8B8;
  padding: 6px 16px;
  border-radius: 4px;
  margin-bottom: 24px;
}
.dept__subs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.dept-sub {
  background: #DDEEFB;
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}
.dept-sub h4 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--ink);
  background: linear-gradient(transparent 65%, #FFE680 65%);
  display: inline-block;
  padding: 0 6px;
}
.dept-sub p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.dept-sub p:last-child { margin-bottom: 0; }
.dept-sub p strong {
  color: var(--ink);
  font-weight: 700;
}
.dept-sub__hl {
  border-top: 1px dashed rgba(0, 0, 0, 0.15);
  padding-top: 10px;
  margin-top: 10px !important;
  font-size: 13px !important;
  font-style: italic;
  color: var(--ink) !important;
}
@media (max-width: 900px) {
  .dept__subs { grid-template-columns: 1fr; }
}

/* ============ Events ============ */
.events {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.event {
  background: rgba(255, 252, 242, 0.06);
  border: 1px solid rgba(255, 252, 242, 0.2);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.event::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  background: radial-gradient(circle at top right, rgba(232, 197, 71, 0.2), transparent 70%);
  pointer-events: none;
}
.event:hover {
  background: rgba(255, 252, 242, 0.1);
  border-color: var(--gold);
  transform: translateY(-4px);
}
.event__tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 4px 12px;
  background: var(--gold);
  color: var(--red-deep);
  border-radius: 4px;
  margin-bottom: 20px;
}
.event h3 {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 12px;
}
.event p {
  font-size: 15px;
  opacity: 0.85;
  line-height: 1.8;
  margin-bottom: 20px;
}
.event__meta {
  font-family: var(--font-en);
  font-size: 13px;
  opacity: 0.6;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.events__more {
  text-align: center;
  margin-top: 48px;
  font-size: 15px;
  opacity: 0.85;
}

/* ============ Join ============ */
.section--join {
  background: var(--cream);
  text-align: center;
}
.join__lede {
  font-size: 18px;
  color: var(--ink-soft);
  margin: 0 auto 60px;
  max-width: 640px;
  line-height: 1.9;
}
.join__steps {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 60px;
  flex-wrap: wrap;
}
.step {
  background: var(--cream-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  width: 220px;
  text-align: left;
  transition: transform 0.3s, box-shadow 0.3s;
}
.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.step__num {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--red);
  line-height: 1;
  margin-bottom: 12px;
}
.step__text { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }
.step__text strong { color: var(--ink); font-size: 16px; }
.step__arrow { color: var(--red); font-size: 24px; }

.join__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.section--join .btn--outline {
  color: var(--red);
  border-color: var(--red);
}
.section--join .btn--outline:hover {
  background: var(--red);
  color: var(--cream-soft);
}

/* ============ Footer ============ */
.footer {
  background: var(--red-deep);
  color: var(--cream-soft);
  padding: 80px 0 32px;
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer__brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer__logo-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}
.footer__logo {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
}
.footer__brand p { font-size: 14px; opacity: 0.7; line-height: 1.7; }
.footer__motto { margin-top: 16px; font-family: var(--font-serif); font-size: 16px; }
.footer__col h4 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  opacity: 0.6;
}
.footer__col a, .footer__col p {
  display: block;
  font-size: 14px;
  opacity: 0.85;
  margin-bottom: 8px;
  line-height: 1.6;
}
.footer__col a:hover { opacity: 1; color: var(--gold); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 252, 242, 0.15);
  font-size: 13px;
  opacity: 0.6;
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .container { padding: 0 20px; }
  .section { padding: 80px 0; }

  .nav__links {
    display: none;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--cream-soft);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-top: 1px solid var(--line);
  }
  .nav__links--open { display: flex; }
  .nav__toggle { display: block; }
  .nav__sub { display: none; }

  .hero__bg { width: 100%; opacity: 0.05; }
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__seal { order: -1; transform: none; }
  .hero__seal-img { width: 220px; height: 220px; }

  .about__grid { grid-template-columns: 1fr; gap: 40px; }
  .eb__grid, .dept-grid, .events { grid-template-columns: 1fr; }
  .eb-card--featured { grid-column: span 1; }

  .step__arrow { transform: rotate(90deg); }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: span 2; }
  .footer__bottom { flex-direction: column; gap: 12px; text-align: center; }
}

@media (max-width: 500px) {
  .footer__inner { grid-template-columns: 1fr; }
  .footer__brand { grid-column: span 1; }
}

/* ============ Explore Cards (index.html, 通向独立页面的入口) ============ */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 64px;
}
.explore-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 36px 32px;
  background: #fff;
  border: 1px solid rgba(166, 24, 42, 0.12);
  border-radius: var(--radius-md);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.explore-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--red);
}
.explore-card__num {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--red);
  opacity: 0.6;
  margin-bottom: 10px;
}
.explore-card h3 {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 8px;
  color: var(--ink);
}
.explore-card p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 16px;
}
.explore-card__more {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--red);
  transition: transform 0.3s;
  display: inline-block;
}
.explore-card:hover .explore-card__more { transform: translateX(6px); }

@media (max-width: 800px) {
  .explore-grid { grid-template-columns: 1fr; }
}

/* ============ Page Hero (departments.html / events.html 顶部) ============ */
.page-hero {
  padding: 140px 0 60px;
  text-align: center;
}
.page-hero__title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 900;
  line-height: 1.1;
  margin: 12px 0 16px;
  color: var(--ink);
}
.page-hero__title--light { color: var(--cream); }
.page-hero__sub {
  max-width: 680px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-hero__sub--light { color: rgba(255, 255, 255, 0.85); }

/* ============ Nav active 状态 ============ */
.nav__links > a.is-active,
.nav__item-link.is-active {
  color: var(--red);
}
.nav__links > a.is-active::after,
.nav__item-link.is-active::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--red);
  margin-top: 4px;
  border-radius: 2px;
}

/* ============ Nav dropdown (部门 hover 子菜单) ============ */
.nav__item--has-sub {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav__item-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.nav__caret {
  font-size: 10px;
  opacity: 0.7;
  transition: transform 0.2s;
}
.nav__item--has-sub:hover .nav__caret { transform: rotate(180deg); }

.nav__sub-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: max-content;
  min-width: 88px;
  background: var(--cream-soft);
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s, transform 0.18s, visibility 0s linear 0.18s;
  z-index: 100;
}
/* 衔接缓冲：避免鼠标在 nav 与菜单间隙时菜单消失 */
.nav__sub-menu::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}
.nav__item--has-sub:hover .nav__sub-menu,
.nav__item--has-sub:focus-within .nav__sub-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
  transition: opacity 0.18s, transform 0.18s, visibility 0s;
}
.nav__sub-menu a {
  display: block;
  padding: 12px 18px;
  font-size: 14px;
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 24, 42, 0.12);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  text-align: center;
}
.nav__sub-menu a:last-child { border-bottom: none; }
.nav__sub-menu a:hover {
  background: var(--cream);
  color: var(--red-dark);
}
.nav__sub-menu a.is-active {
  color: var(--red-dark);
  font-weight: 700;
}

/* Events 卡片可点击版 */
.event--link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.event--link:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

/* ============ Wechat QR Modal ============ */
.wechat-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(43, 19, 23, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: wechat-fade 0.2s ease-out;
}
.wechat-modal.is-open { display: flex; }
@keyframes wechat-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.wechat-modal__card {
  position: relative;
  background: var(--cream-soft, #FBF4DD);
  border: 3px solid var(--red, #A6182A);
  border-radius: 16px;
  padding: 40px 48px 32px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 30px 60px rgba(0,0,0,0.25);
  animation: wechat-pop 0.25s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes wechat-pop {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.wechat-modal__close {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  font-size: 28px;
  line-height: 1;
  color: var(--red, #A6182A);
  cursor: pointer;
  border-radius: 50%;
  transition: background 0.15s;
}
.wechat-modal__close:hover { background: rgba(166,24,42,0.1); }
.wechat-modal__title {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--red-dark, #7B0F1F);
  margin: 0 0 24px;
  font-weight: 700;
  letter-spacing: 1px;
}
.wechat-modal__qr {
  width: 280px;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 20px;
  border-radius: 8px;
  background: #fff;
}
.wechat-modal__hint {
  font-size: 13px;
  color: var(--ink-soft, #6b5050);
  margin: 0;
  letter-spacing: 0.5px;
}

/* 移动端调小 */
@media (max-width: 480px) {
  .wechat-modal__card { padding: 32px 24px 24px; }
  .wechat-modal__qr { width: 240px; }
  .wechat-modal__title { font-size: 18px; }
}