/* ==============================================
   CSS Custom Properties — Design ⑦ colors + ④ typography
   ============================================== */
:root {
  /* Colors */
  --color-primary:       #6248A8;
  --color-primary-dark:  #3D2B6B;
  --color-primary-light: #8A72C8;
  --color-accent:        #F07060;
  --color-accent-dark:   #D45848;
  --color-bg:            #FFFFFF;
  --color-bg-alt:        #F8F5FF;
  --color-text:          #2A1F44;
  --color-text-muted:    #6A5A88;
  --color-border:        #DDD0F8;

  /* Typography */
  --font-body:    'Nunito', sans-serif;
  --font-display: 'Nunito', sans-serif;

  /* Radii */
  --radius:    10px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Shadows */
  --shadow-sm: 0 2px 12px rgba(98, 72, 168, 0.1);
  --shadow-md: 0 6px 24px rgba(98, 72, 168, 0.18);
  --shadow-lg: 0 14px 48px rgba(98, 72, 168, 0.26);

  /* Layout */
  --nav-height: 72px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; }

/* ==============================================
   Scroll Animations (Intersection Observer)
   ============================================== */
[data-animate] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}
[data-animate][data-animate-delay="1"] { transition-delay: 0.10s; }
[data-animate][data-animate-delay="2"] { transition-delay: 0.20s; }
[data-animate][data-animate-delay="3"] { transition-delay: 0.30s; }
[data-animate][data-animate-delay="4"] { transition-delay: 0.40s; }

/* Hero stagger */
.hero-badge  { animation: slideDown  0.7s ease 0.1s both; }
.hero-date   { animation: fadeUp     0.7s ease 0.35s both; }
.hero-title  { animation: fadeUp     0.8s ease 0.55s both; }
.hero-cta    { animation: fadeUp     0.7s ease 0.8s both; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==============================================
   Layout Utilities
   ============================================== */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 88px 0; }
.section--alt { background: var(--color-bg-alt); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 52px;
  font-size: 1.05rem;
}

.section-title + .cards-grid,
.section-title + .involve-grid,
.section-title + .participants-grid {
  margin-top: 52px;
}

/* ==============================================
   Buttons
   ============================================== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.4px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-accent:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(240, 112, 96, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn--full { width: 100%; text-align: center; }

.btn-coming-soon {
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.5);
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: not-allowed;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.9rem;
  padding: 12px 32px;
  border-radius: var(--radius);
  letter-spacing: 2px;
  text-transform: uppercase;
}
.btn-coming-soon:hover {
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.5);
  transform: none;
  box-shadow: none;
}

/* ==============================================
   Navigation
   ============================================== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition),
              backdrop-filter var(--transition);
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-img {
  height: 46px;
  width: auto;
  display: block;
  object-fit: contain;
  filter: brightness(0) invert(1);
  transition: filter var(--transition);
}
#navbar.scrolled .nav-logo-img { filter: none; }

/* Footer logo */
.footer-logo-img {
  height: 56px;
  width: auto;
  display: block;
  margin: 0 auto 12px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.nav-menu {
  display: flex;
  gap: 4px;
  align-items: center;
}

.nav-link {
  padding: 6px 14px;
  font-size: 0.88rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  transition: background var(--transition), color var(--transition);
}
.nav-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}
#navbar.scrolled .nav-link { color: var(--color-text-muted); }
#navbar.scrolled .nav-link:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* Language Switcher Button */
.lang-btn {
  padding: 5px 14px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.4px;
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 20px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.lang-btn:hover {
  background: rgba(255, 255, 255, 0.28);
  color: #fff;
}
#navbar.scrolled .lang-btn {
  background: var(--color-bg-alt);
  color: var(--color-primary);
  border-color: var(--color-border);
}
#navbar.scrolled .lang-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
#navbar.scrolled .hamburger span { background: var(--color-primary-dark); }
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==============================================
   Hero — Seattle Night Sky
   ============================================== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(160deg, #1A0A38 0%, #3D2B6B 40%, #6248A8 75%, #8A72C8 100%);
  padding: var(--nav-height) 24px 100px;
  overflow: hidden;
}

/* Subtle radial glow */
#hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 25% 60%, rgba(240,112,96,0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 75% 30%, rgba(138,114,200,0.2) 0%, transparent 50%);
}

/* Rain */
.hero-rain {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

/* Mountains silhouette (SVG injected by JS) */
.hero-mountains {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  pointer-events: none;
  z-index: 1;
  line-height: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(240, 112, 96, 0.25);
  border: 1px solid rgba(240, 112, 96, 0.5);
  border-radius: 40px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #FFB8AE;
  margin-bottom: 20px;
}

.hero-event-date {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.5vw, 3rem);
  color: #fff;
  line-height: 1.45;
  margin-bottom: 40px;
}

/* ==============================================
   Who Can Join?
   ============================================== */
.participants-strip { background: var(--color-bg); }

.participants-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.participant-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 36px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-alt);
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
}
.participant-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.participant-icon {
  font-size: 2.8rem;
  margin-bottom: 14px;
}
.participant-item h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}
.participant-item p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ==============================================
   Concept Cards
   ============================================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border-left: 3px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--color-accent);
}

.card-icon { font-size: 2.4rem; margin-bottom: 16px; }
.card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}
.card-text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ==============================================
   About Us
   ============================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  align-items: center;
}
.about-text .section-title { text-align: left; margin-bottom: 24px; }
.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.about-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  box-shadow: var(--shadow-sm);
}
.stat-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.stat-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ==============================================
   Get Involved
   ============================================== */
.involve-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 52px;
}

.involve-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.involve-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.involve-card--featured {
  border-color: var(--color-primary);
  background: linear-gradient(160deg, #fff 60%, var(--color-bg-alt));
  position: relative;
}
.involve-card--featured::before {
  content: 'Featured';
  position: absolute;
  top: -1px; right: 20px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 0 0 var(--radius) var(--radius);
}

.involve-icon { font-size: 2.6rem; }
.involve-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}
.involve-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
}

/* ==============================================
   Modal
   ============================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(61, 43, 107, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 500px;
  width: 100%;
  position: relative;
  transform: translateY(24px) scale(0.97);
  transition: transform 0.3s ease;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-overlay.open .modal-box {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}
.modal-close:hover {
  background: var(--color-primary);
  color: #fff;
}

.modal-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  text-align: center;
}
.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
  text-align: center;
}
.modal-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 28px;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ==============================================
   Contact
   ============================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.3px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(98, 72, 168, 0.12);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 8px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}
.contact-icon { font-size: 1.2rem; flex-shrink: 0; }

.contact-social { display: flex; gap: 12px; margin-top: 8px; }
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.social-link:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ==============================================
   Footer
   ============================================== */
footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.65);
  padding: 44px 0;
  text-align: center;
}
.footer-copy { font-size: 0.85rem; }

/* ==============================================
   Responsive — Tablet
   ============================================== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-visual {
    flex-direction: row;
    justify-content: center;
  }
  .contact-grid { grid-template-columns: 1fr; }
}

/* ==============================================
   Responsive — Mobile
   ============================================== */
@media (max-width: 768px) {
  :root { --nav-height: 64px; }

  .hamburger { display: flex; }

  .nav-menu {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    background: rgba(26, 10, 56, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    transform: translateY(-110%);
    transition: transform 0.3s ease;
  }
  .nav-menu.open { transform: translateY(0); }

  .nav-link {
    display: block;
    padding: 14px 24px;
    color: rgba(255, 255, 255, 0.85);
    border-radius: 0;
    width: 100%;
  }
  .nav-link:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
  }
  #navbar.scrolled .nav-link { color: rgba(255, 255, 255, 0.85); }
  #navbar.scrolled .nav-link:hover { background: rgba(255,255,255,0.08); color: #fff; }

  .lang-btn {
    width: calc(100% - 48px);
    margin: 8px 24px 4px;
    text-align: center;
  }

  .hero-title { font-size: 1.65rem; }

  .cards-grid      { grid-template-columns: 1fr; }
  .involve-grid    { grid-template-columns: 1fr; }
  .participants-grid { grid-template-columns: 1fr; }

  .section { padding: 64px 0; }
  .about-text .section-title { text-align: center; }

  .modal-box { padding: 28px 24px; }
}