/* ===== BTA — Business Technology Association ===== */
/* Purple & Black theme, AI node branding */

:root,
[data-theme="dark"] {
  --black: #0a0a0b;
  --black-soft: #121214;
  --black-card: #161618;
  --purple-dark: #2d1b4e;
  --purple: #6b21a8;
  --purple-mid: #7c3aed;
  --purple-bright: #a78bfa;
  --purple-glow: rgba(167, 139, 250, 0.25);
  --white: #fafafa;
  --on-purple: #fafafa;
  --gray: #71717a;
  --gray-light: #a1a1aa;
  --radius: 8px;
  --radius-lg: 12px;
  --font: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --tech-glow: 0 0 20px rgba(167, 139, 250, 0.2);
}

[data-theme="light"] {
  --black: #fafafa;
  --black-soft: #f4f4f5;
  --black-card: #ffffff;
  --purple-dark: #3b0764;
  --purple: #6b21a8;
  --purple-mid: #7c3aed;
  --purple-bright: #6b21a8;
  --purple-glow: rgba(107, 33, 168, 0.15);
  --white: #0a0a0b;
  --gray: #52525b;
  --gray-light: #3f3f46;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

html::-webkit-scrollbar {
  display: none;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--black);
  color: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--purple-bright);
  text-decoration: none;
}

a:hover {
  color: var(--white);
}

/* ----- Header & Nav ----- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(107, 33, 168, 0.25);
  box-shadow: 0 1px 0 rgba(167, 139, 250, 0.08);
}

[data-theme="light"] .header {
  background: rgba(250, 250, 250, 0.9);
  border-bottom-color: rgba(107, 33, 168, 0.15);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--white);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.05em;
}

.logo:hover {
  color: var(--purple-bright);
}

.logo-img {
  height: 36px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--gray-light);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--purple-bright);
  font-weight: 600;
  box-shadow: 0 2px 0 var(--purple-mid);
}

/* ----- Preferences button & panel ----- */
.preferences-wrap {
  position: relative;
}

.preferences-btn {
  padding: 0.4rem 0.85rem;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-light);
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.3);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.preferences-btn:hover {
  color: var(--purple-bright);
  border-color: var(--purple-mid);
  background: rgba(107, 33, 168, 0.15);
}

.preferences-btn[aria-expanded="true"] {
  color: var(--purple-bright);
  border-color: var(--purple-mid);
}

.preferences-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 220px;
  padding: 1rem;
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
}

.preferences-panel.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.preferences-panel[aria-hidden="true"] {
  pointer-events: none;
}

.preferences-section {
  margin-bottom: 1rem;
}

.preferences-section:last-child {
  margin-bottom: 0;
}

.preferences-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.preferences-options {
  display: flex;
  gap: 0.35rem;
}

.pref-option {
  flex: 1;
  padding: 0.4rem 0.6rem;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid rgba(107, 33, 168, 0.25);
  border-radius: 6px;
  color: var(--gray-light);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.pref-option:hover {
  color: var(--purple-bright);
  border-color: var(--purple-mid);
}

.pref-option.active {
  background: rgba(107, 33, 168, 0.35);
  border-color: var(--purple-mid);
  color: var(--on-purple);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 1px;
}

/* ----- Hero ----- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 10, 11, 0.5) 0%, rgba(10, 10, 11, 0.75) 100%),
    url(assets/hero-bg.png) center / cover no-repeat;
  pointer-events: none;
}

.hero-node {
  position: absolute;
  border-radius: 50%;
  background: rgba(167, 139, 250, 0.15);
  pointer-events: none;
  animation: hero-float 20s ease-in-out infinite;
}

.hero-node-1 { width: 12px; height: 12px; left: 15%; top: 25%; animation-delay: 0s; }
.hero-node-2 { width: 8px; height: 8px; left: 75%; top: 30%; animation-delay: -3s; animation-duration: 18s; }
.hero-node-3 { width: 16px; height: 16px; left: 80%; top: 65%; animation-delay: -6s; animation-duration: 22s; }
.hero-node-4 { width: 10px; height: 10px; left: 20%; top: 70%; animation-delay: -9s; animation-duration: 16s; }
.hero-node-5 { width: 6px; height: 6px; left: 50%; top: 15%; animation-delay: -12s; animation-duration: 24s; }
.hero-node-6 { width: 14px; height: 14px; left: 45%; top: 80%; animation-delay: -5s; animation-duration: 19s; }

@keyframes hero-float {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.6; }
  25% { transform: translate(15px, -20px) scale(1.1); opacity: 0.9; }
  50% { transform: translate(-10px, 10px) scale(0.95); opacity: 0.7; }
  75% { transform: translate(-20px, -10px) scale(1.05); opacity: 0.85; }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
}

.hero-logo {
  margin: 0 auto 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-logo-img {
  max-width: 160px;
  width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 24px var(--purple-glow));
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
  color: #fafafa;
  background: linear-gradient(180deg, #fafafa 0%, #c4b5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--gray-light);
  margin: 0 0 2rem;
  font-weight: 400;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--purple) 0%, var(--purple-mid) 100%);
  color: var(--on-purple);
  box-shadow: 0 4px 20px var(--purple-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--purple-glow);
}

/* ----- Sections ----- */
.section {
  padding: 4.5rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.section.reveal {
  opacity: 1;
  transform: translateY(0);
}

.who-card,
.team-card,
.event-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out, border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.who-card.reveal { opacity: 1; transform: translateY(0); }
.team-card.reveal { opacity: 1; transform: translateY(0); }
.event-card.reveal { opacity: 1; transform: translateY(0); }

.who-card.reveal:nth-child(1) { transition-delay: 0.1s; }
.who-card.reveal:nth-child(2) { transition-delay: 0.2s; }
.who-card.reveal:nth-child(3) { transition-delay: 0.3s; }

.team-grid .team-card.reveal:nth-child(1) { transition-delay: 0.05s; }
.team-grid .team-card.reveal:nth-child(2) { transition-delay: 0.1s; }
.team-grid .team-card.reveal:nth-child(3) { transition-delay: 0.15s; }
.team-grid .team-card.reveal:nth-child(4) { transition-delay: 0.2s; }

.event-card.reveal:nth-child(1) { transition-delay: 0.1s; }
.event-card.reveal:nth-child(2) { transition-delay: 0.2s; }
.event-card.reveal:nth-child(3) { transition-delay: 0.3s; }
.event-card.reveal:nth-child(4) { transition-delay: 0.4s; }

.faq-item {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease-out, transform 0.4s ease-out, border-color 0.2s;
}

.faq-item.reveal { opacity: 1; transform: translateY(0); }

.faq-item.reveal:nth-child(1) { transition-delay: 0.05s; }
.faq-item.reveal:nth-child(2) { transition-delay: 0.1s; }
.faq-item.reveal:nth-child(3) { transition-delay: 0.15s; }
.faq-item.reveal:nth-child(4) { transition-delay: 0.2s; }
.faq-item.reveal:nth-child(5) { transition-delay: 0.25s; }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
  color: var(--white);
  position: relative;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(107, 33, 168, 0.3);
}

.section-title::before {
  content: '// ';
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--purple-mid);
  opacity: 0.9;
}

.section-subtitle {
  color: var(--gray);
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ----- Who We Are ----- */
.who {
  background: var(--black-soft);
}

.who-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.who-card {
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.25);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.who-card:hover {
  border-color: var(--purple-mid);
  box-shadow: 0 8px 32px rgba(107, 33, 168, 0.15);
}

.who-icon {
  font-size: 1.5rem;
  color: var(--purple-mid);
  margin-bottom: 1rem;
  opacity: 0.9;
}

.who-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--white);
}

.who-card p {
  margin: 0;
  color: var(--gray-light);
  font-size: 0.95rem;
}

/* ----- Team ----- */
.team {
  background: var(--black);
}

.team-dept {
  margin-top: 2.5rem;
}

.team-dept:first-of-type {
  margin-top: 2rem;
}

.team-dept-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--purple-bright);
  margin: 0 0 1rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: 0;
}

.team-card {
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.team-card:hover {
  border-color: var(--purple-mid);
  transform: translateY(-4px);
}

.team-avatar {
  width: 72px;
  height: 72px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--purple) 0%, var(--purple-mid) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--on-purple);
}

.team-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
  color: var(--white);
}

.team-role {
  color: var(--gray-light);
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0;
  line-height: 1.4;
}

/* ----- Companies carousel ----- */
.companies {
  background: var(--black);
}

.companies-carousel {
  position: relative;
  margin-top: 2rem;
  padding: 0 2.5rem;
}

.companies-viewport {
  overflow: hidden;
}

.companies-track {
  display: flex;
  gap: 1.25rem;
  transition: transform 0.35s ease-out;
  will-change: transform;
}

.company-slide {
  flex: 0 0 calc(25% - 1rem);
  min-width: calc(25% - 1rem);
}

@media (max-width: 699px) {
  .company-slide {
    flex: 0 0 calc(50% - 0.625rem);
    min-width: calc(50% - 0.625rem);
  }
  .companies-carousel {
    padding: 0 2.25rem;
  }
}

.company-logo {
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.25);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-light);
  font-size: 0.95rem;
  font-weight: 500;
  transition: border-color 0.2s, color 0.2s;
}

.company-logo img {
  max-height: 48px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.company-logo-fallback {
  display: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-light);
}

.company-logo-fallback.show {
  display: block;
}

.company-logo:hover {
  border-color: var(--purple-mid);
  color: var(--purple-bright);
}

.companies-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--black-card);
  border: 1px solid rgba(167, 139, 250, 0.35);
  color: var(--purple-bright);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}

.companies-btn:hover {
  background: rgba(107, 33, 168, 0.3);
  border-color: var(--purple-mid);
}

.companies-prev {
  left: 0;
}

.companies-next {
  right: 0;
}

/* ----- Fun Photos (screen-wide carousel) ----- */
.photos {
  background: var(--black-soft);
  max-width: none;
  width: 100%;
  padding-left: 0;
  padding-right: 0;
}

.photos-header {
  margin-bottom: 0;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.photos .section-subtitle {
  margin-bottom: 1.5rem;
}

.carousel {
  position: relative;
  width: 100%;
}

.carousel-viewport {
  width: 100%;
  overflow: hidden;
  padding: 0 0.25rem;
}

.carousel-track {
  display: flex;
  gap: 1rem;
  transition: transform 0.4s ease-out;
  will-change: transform;
}

.carousel-slide {
  flex: 0 0 calc(33.333% - 0.667rem);
  min-width: calc(33.333% - 0.667rem);
  aspect-ratio: 5 / 4;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--black-card);
}

@media (max-width: 899px) {
  .carousel-slide {
    flex: 0 0 calc(50% - 0.5rem);
    min-width: calc(50% - 0.5rem);
    aspect-ratio: 5 / 4;
  }
}

@media (max-width: 499px) {
  .carousel-slide {
    flex: 0 0 calc(100% - 0rem);
    min-width: 100%;
    aspect-ratio: 5 / 4;
  }
}

.carousel-slide {
  cursor: pointer;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  vertical-align: middle;
}

/* ----- Photo lightbox ----- */
.photo-lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.photo-lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.photo-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 11, 0.92);
  cursor: pointer;
}

.photo-lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 2;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(167, 139, 250, 0.2);
  border: 1px solid rgba(167, 139, 250, 0.5);
  color: var(--purple-bright);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.photo-lightbox-close:hover {
  background: var(--purple-mid);
  border-color: var(--purple-bright);
  color: var(--on-purple);
}

.photo-lightbox-img {
  position: relative;
  z-index: 1;
  max-width: 95vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(10, 10, 11, 0.8);
  border: 1px solid rgba(167, 139, 250, 0.4);
  color: var(--purple-bright);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.carousel-btn:hover {
  background: var(--purple-mid);
  border-color: var(--purple-bright);
  color: var(--on-purple);
}

.carousel-prev {
  left: 1rem;
}

.carousel-next {
  right: 1rem;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.25rem;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(167, 139, 250, 0.35);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background 0.2s, transform 0.2s;
}

.carousel-dot:hover {
  background: rgba(167, 139, 250, 0.6);
}

.carousel-dot.is-active {
  background: var(--purple-bright);
  transform: scale(1.2);
}

/* ----- Events ----- */
.events {
  background: var(--black-soft);
}

.events-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

.event-card {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.25);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.event-card:hover {
  border-color: var(--purple-mid);
  box-shadow: 0 8px 32px rgba(107, 33, 168, 0.12);
}

.event-date {
  flex-shrink: 0;
  width: 64px;
  text-align: center;
  padding: 0.5rem;
  background: linear-gradient(135deg, var(--purple-dark) 0%, var(--purple) 100%);
  border-radius: var(--radius);
}

.event-day {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--on-purple);
}

.event-month {
  font-size: 0.8rem;
  color: var(--on-purple);
  font-weight: 500;
}

.event-details h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  color: var(--white);
}

.event-details p {
  margin: 0 0 0.5rem;
  color: var(--gray-light);
  font-size: 0.95rem;
}

.event-meta,
.event-location {
  font-size: 0.85rem;
  color: var(--gray);
  margin: 0 0 0.5rem;
}

.event-tentative .event-date {
  opacity: 0.85;
}

.event-tentative .event-details h3 {
  font-weight: 500;
}

.tentative {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray);
}

/* ----- FAQ ----- */
.faq {
  background: var(--black);
}

.faq-list {
  max-width: 680px;
  margin-top: 2rem;
}

.faq-item {
  background: var(--black-card);
  border: 1px solid rgba(107, 33, 168, 0.2);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item:hover {
  border-color: rgba(107, 33, 168, 0.4);
}

.faq-item[open] {
  border-color: var(--purple-mid);
}

.faq-item summary {
  padding: 1.1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--purple-bright);
  font-weight: 400;
  transition: transform 0.2s;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin: 0;
  padding: 0 1.25rem 1.25rem;
  color: var(--gray-light);
  font-size: 0.95rem;
  line-height: 1.6;
  border-top: 1px solid rgba(107, 33, 168, 0.15);
  padding-top: 1rem;
  margin-top: 0;
  margin-left: 0;
  margin-right: 0;
}

/* ----- Footer ----- */
.footer {
  background: var(--black-soft);
  border-top: 1px solid rgba(107, 33, 168, 0.2);
  padding: 2.5rem 1.5rem;
}

.footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--gray-light);
  font-size: 0.95rem;
}

.footer-logo-img {
  height: 28px;
  width: auto;
  object-fit: contain;
  opacity: 0.9;
}

.footer-copy {
  margin: 0;
  color: var(--gray);
  font-size: 0.875rem;
}

/* ----- Back to top ----- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 50;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--purple) 0%, var(--purple-mid) 100%);
  color: var(--on-purple);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px var(--purple-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, box-shadow 0.2s;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: 0 6px 28px var(--purple-glow);
  transform: translateY(-2px);
}

.back-to-top.is-visible:hover {
  transform: translateY(-2px);
}

.back-to-top-icon {
  font-size: 1.25rem;
  line-height: 1;
}

/* ----- Easter egg toast ----- */
.easter-toast {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 100;
  padding: 0.75rem 1.5rem;
  background: var(--black-card);
  border: 1px solid var(--purple-mid);
  border-radius: var(--radius);
  color: var(--purple-bright);
  font-weight: 500;
  font-size: 0.95rem;
  box-shadow: 0 8px 32px rgba(107, 33, 168, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
}

.easter-toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ----- Mobile ----- */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--black-soft);
    border-bottom: 1px solid rgba(107, 33, 168, 0.2);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .preferences-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.85rem;
  }

  .preferences-panel {
    right: 0;
    min-width: 200px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .nav-toggle span {
    transition: transform 0.3s, opacity 0.3s;
  }

  .event-card {
    flex-direction: column;
    gap: 1rem;
  }

  .event-date {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }

  .event-day {
    font-size: 1.25rem;
  }
}