/* ========================================
   SVstem — Design System & Styles
   Minimalistic, clean, modern
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #64648c;
  --color-accent: #4f46e5;
  --color-accent-light: #818cf8;
  --color-accent-bg: #eef2ff;
  --color-border: #e5e5ef;
  --color-success: #10b981;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --transition: 0.2s ease;

  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* --- Container --- */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-accent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: none;
  height: var(--nav-height);
  overflow: visible;
}

.nav-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 clamp(20px, 3vw, 32px);
  padding-left: clamp(22px, 4vw, 42px);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0;
  height: 100%;
}

.nav-logo {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

#main-nav .nav-logo {
  flex-shrink: 0;
  color: #fff;
  text-decoration: none;
  margin-right: clamp(22px, 3vw, 40px);
}

.logo-accent {
  color: rgba(255, 255, 255, 0.8);
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  flex: 1;
  justify-content: space-between;
  gap: 0;
  min-width: 0;
  max-width: 100%;
  margin-left: 0;
  position: relative;
}

.nav-links-group {
  list-style: none;
}

.nav-links-group-start,
.nav-links-group-end {
  flex: 1;
  display: flex;
  align-items: center;
  min-width: 0;
}

.nav-links-group-start {
  justify-content: flex-end;
  padding-right: clamp(2.5rem, 5vw, 4rem);
}

.nav-links-group-end {
  justify-content: flex-start;
  padding-left: clamp(2.5rem, 5vw, 4rem);
}

.nav-links-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links-group-center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  margin: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.2;
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 48px) 24px 80px;
  max-width: 1080px;
  margin: 0 auto;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.text-accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 500px;
}

.hero-decoration {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
}

.hero-shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.12;
}

.shape-1 {
  width: 320px;
  height: 320px;
  background: var(--color-accent);
  top: 0;
  right: 0;
  animation: float 8s ease-in-out infinite;
}

.shape-2 {
  width: 200px;
  height: 200px;
  background: var(--color-accent-light);
  bottom: 20px;
  left: 20px;
  animation: float 6s ease-in-out infinite reverse;
}

.shape-3 {
  width: 120px;
  height: 120px;
  background: var(--color-success);
  top: 40px;
  left: 60px;
  animation: float 7s ease-in-out infinite 1s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: #4338ca;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent-bg);
}

/* --- Sections --- */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 48px;
  text-align: center;
}

/* --- Page Header --- */
.page-header {
  padding: calc(var(--nav-height) + 56px) 0 40px;
  text-align: center;
}

.page-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.page-description {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

/* --- About Cards --- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition);
}

.about-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.about-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  line-height: 1.65;
}

/* --- CTA --- */
.cta-container {
  text-align: center;
  max-width: 600px;
}

.cta-text {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Team --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

.team-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.team-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-accent-bg);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 auto 20px;
}

.team-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.team-role {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  margin-bottom: 14px;
}

.team-email {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--transition);
}

.team-email:hover {
  color: #4338ca;
}

/* --- Chapters --- */
.chapter-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 32px;
}

.chapter-top {
  padding: 14px 24px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.chapter-top-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.chapter-name-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  width: 100%;
  line-height: 1.15;
}

.chapter-name-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 10px;
  width: 100%;
  max-width: 100%;
  text-align: center;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.chapter-name-toggle:hover {
  color: var(--color-accent);
}

.chapter-name-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.chapter-name-toggle .chapter-name {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.chapter-name-toggle .chapter-badge {
  flex-shrink: 0;
}

.chapter-name-chevron {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

.chapter-name-toggle[aria-expanded="true"] .chapter-name-chevron {
  transform: rotate(180deg);
}

.chapter-photo-frame {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  background: var(--color-surface);
}

.chapter-photo {
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  display: block;
}

.chapter-name {
  font-size: 1.25rem;
  font-weight: 600;
}

.chapter-badge {
  background: #ecfdf5;
  color: var(--color-success);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
}

.chapter-sections {
  padding: 32px;
  display: grid;
  gap: 32px;
}

.chapter-sections[hidden] {
  display: none !important;
}

.chapter-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.8rem;
}

.chapter-board {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.board-member {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--color-bg);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.board-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-accent-bg);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.board-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.board-role {
  color: var(--color-text-secondary);
  font-size: 0.82rem;
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px dashed var(--color-border);
}

.empty-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.empty-state p {
  color: var(--color-text-secondary);
  font-size: 0.93rem;
}

/* --- Calendar --- */
.calendar-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.calendar-month {
  font-size: 1.15rem;
  font-weight: 600;
}

.calendar-btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--color-text);
  transition: all var(--transition);
}

.calendar-btn:hover {
  background: var(--color-accent-bg);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

#cal-days {
  display: contents;
}

.calendar-day-header {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 8px 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calendar-day {
  text-align: center;
  padding: 10px 4px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  transition: background var(--transition);
}

.calendar-day.today {
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.calendar-day.other-month {
  color: #d1d1e0;
}

/* Events page — compact calendar (leave room for list below) */
#events-header.page-header {
  padding-bottom: 0;
}

#events-calendar.section {
  padding: 16px 0 32px;
}

#events-calendar .section-title {
  font-size: 1.35rem;
  margin-top: 0;
  margin-bottom: 16px;
}

#events-listing .section-title {
  font-size: 1.35rem;
  margin-bottom: 20px;
  text-align: center;
}

#events-calendar .calendar-wrapper {
  max-width: 380px;
  margin: 0 auto;
  padding: 14px 16px 16px;
}

#events-calendar .calendar-nav {
  margin-bottom: 10px;
}

#events-calendar .calendar-month {
  font-size: 0.98rem;
}

#events-calendar .calendar-btn {
  padding: 4px 10px;
  font-size: 0.88rem;
}

#events-calendar .calendar-day-header {
  padding: 3px 0;
  font-size: 0.65rem;
}

#events-calendar .calendar-day {
  padding: 5px 2px;
  font-size: 0.76rem;
}

#events-listing.section {
  padding-top: 48px;
}

/* --- Nav Dropdown --- */
.nav-dropdown {
  position: relative;
}

.dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
}

.dropdown-arrow {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  min-width: 240px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  list-style: none;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 4px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  z-index: 200;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.nav-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu li a {
  display: block;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.dropdown-menu li a:hover,
.dropdown-menu li a.active {
  color: var(--color-accent);
  background: var(--color-accent-bg);
}

/* --- Events Listing Cards --- */
.events-list {
  display: grid;
  gap: 16px;
}

.event-card {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition);
}

.event-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.event-card-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 56px;
  padding: 12px 8px;
  background: var(--color-accent-bg);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.event-card-month {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-accent);
}

.event-card-day {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
}

.event-card-year {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
}

.event-card-info {
  flex: 1;
  min-width: 0;
}

.event-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.event-card-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.event-card-arrow {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  transition: transform var(--transition), color var(--transition);
}

.event-card:hover .event-card-arrow {
  transform: translateX(4px);
  color: var(--color-accent);
}

/* --- Event Detail Page --- */
.back-link {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 16px;
  transition: opacity var(--transition);
}

.back-link:hover {
  opacity: 0.7;
}

.event-detail-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.event-detail-meta {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 32px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.event-detail-date-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 72px;
  padding: 16px 12px;
  background: var(--color-accent-bg);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.event-detail-month {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-accent);
}

.event-detail-day {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
}

.event-detail-year {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

.event-detail-info p {
  font-size: 0.93rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.event-detail-info p strong {
  color: var(--color-text);
}

.event-detail-body {
  padding: 32px;
}

.event-detail-body h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.event-detail-body p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.event-detail-body p:last-child {
  margin-bottom: 0;
}

/* --- Lead a Chapter Page --- */
.lead-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}

.lead-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.lead-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 14px;
}

.lead-content p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 14px;
}

.lead-list {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  padding-left: 24px;
  margin-bottom: 8px;
}

.lead-list li {
  margin-bottom: 6px;
}

.inline-link {
  color: var(--color-accent);
  font-weight: 500;
  transition: opacity var(--transition);
}

.inline-link:hover {
  opacity: 0.7;
}

.lead-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.lead-cta-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
}

.lead-cta-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.lead-cta-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.lead-cta-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.lead-stats-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 24px;
}

.lead-stat {
  flex: 1;
  text-align: center;
}

.lead-stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.lead-stat-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Footer --- */
#main-footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
}

#main-footer .nav-logo {
  color: var(--color-text);
}

#main-footer .logo-accent {
  color: var(--color-accent);
}

.footer-content {
  text-align: center;
}

.footer-brand {
  margin-bottom: 20px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  margin-top: 6px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-copy {
  color: #b0b0c8;
  font-size: 0.8rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-container {
    justify-content: space-between;
    padding-left: 20px;
    padding-right: 20px;
  }

  #main-nav .nav-logo {
    margin-right: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    flex: 0 0 auto;
    margin-left: 0;
    width: auto;
    max-width: none;
    justify-content: flex-start;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-accent);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links-group-start,
  .nav-links-group-end {
    flex: none;
    padding: 0;
    width: 100%;
    justify-content: flex-start;
  }

  .nav-links-group-center {
    position: static;
    transform: none;
    width: 100%;
  }

  .nav-links-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + 48px) 24px 64px;
  }

  .hero-decoration {
    display: none;
  }

  .hero-title {
    font-size: 2rem;
  }

  .section {
    padding: 56px 0;
  }

  .chapter-top {
    padding: 12px 16px 14px;
  }

  .chapter-top-inner {
    gap: 10px;
  }

  .chapter-name-toggle {
    width: 100%;
  }

  .chapter-sections {
    padding: 24px;
  }

  .calendar-wrapper {
    padding: 20px 16px;
  }

  #events-calendar .calendar-wrapper {
    max-width: min(380px, 100%);
    padding: 12px 12px 14px;
  }

  .team-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 0 16px;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    transform: none;
    transition: opacity 0.2s ease, max-height 0.3s ease, visibility 0.2s ease;
  }

  .nav-dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 200px;
  }

  .event-detail-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .event-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .event-card-arrow {
    display: none;
  }

  .lead-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .calendar-day {
    padding: 8px 2px;
    font-size: 0.78rem;
  }
}

/* --- Fade-in animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}