/* ═══════════════════════════════════════════════
   PROPELLUS TECH SUMMIT 2025
   Color Palette: Deep navy + teal accent + warm gold
   ═══════════════════════════════════════════════ */

:root {
  --bg: #0B0F1A;
  --bg-surface: #111827;
  --bg-card: #1A2235;
  --bg-card-hover: #1F2A40;
  --border: #2A3554;
  --text: #E8ECF4;
  --text-muted: #8B95AD;
  --text-faint: #4A5578;
  --accent: #00C2B8;
  --accent-hover: #00A89F;
  --accent-glow: rgba(0, 194, 184, 0.15);
  --gold: #F5B731;
  --gold-muted: rgba(245, 183, 49, 0.15);
  --gradient-start: #0B0F1A;
  --gradient-mid: #0D1425;
  --gradient-end: #111827;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
  position: relative;
}

/* ─── Overline ─── */
.overline {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

/* ─── Section Header ─── */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ═══════════════════
   NAVIGATION
   ═══════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all 0.3s ease;
  backdrop-filter: blur(0px);
}

.nav.scrolled {
  background: rgba(11, 15, 26, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.08em;
}

.nav-logo svg { color: var(--accent); }

.nav-logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
  background: var(--accent) !important;
  color: var(--bg) !important;
  padding: 8px 20px !important;
  border-radius: 8px;
  font-weight: 600 !important;
  font-size: 13px !important;
  transition: all 0.2s !important;
}

.nav-cta:hover {
  background: var(--accent-hover) !important;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
  border-radius: 2px;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: rgba(11, 15, 26, 0.97);
  backdrop-filter: blur(20px);
  padding: 24px;
  z-index: 99;
  flex-direction: column;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  color: var(--text-muted);
  font-size: 16px;
  padding: 8px 0;
}

/* ═══════════════════
   HERO
   ═══════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0, 194, 184, 0.08), transparent),
    radial-gradient(ellipse 60% 50% at 70% 20%, rgba(245, 183, 49, 0.05), transparent),
    linear-gradient(180deg, var(--gradient-start), var(--gradient-mid) 50%, var(--gradient-end));
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.hero-particles .particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat 8s infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  100% { opacity: 0; transform: translateY(-20vh) scale(1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { opacity: 0.7; box-shadow: 0 0 0 8px transparent; }
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 24px;
}

.hero-line {
  display: block;
  font-size: clamp(44px, 10vw, 96px);
}

.hero-line.accent {
  background: linear-gradient(135deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  color: var(--text);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
}

/* ─── Hero Stats ─── */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-plus {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ─── Scroll Indicator ─── */
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.5); opacity: 0.4; }
}

/* ═══════════════════
   ABOUT
   ═══════════════════ */
.about {
  background: var(--bg);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s ease;
}

.about-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(0, 194, 184, 0.08);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 12px;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.about-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.about-card p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── Photo Marquee ─── */
.photo-marquee {
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 0 -24px;
}

.marquee-track {
  display: flex;
  gap: 16px;
  animation: marquee 40s linear infinite;
  width: max-content;
}

.marquee-track img {
  width: 320px;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
  flex-shrink: 0;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ═══════════════════
   KEYNOTE
   ═══════════════════ */
.keynote {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-surface) 50%, var(--bg) 100%);
}

.keynote-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}

.keynote-img-wrap {
  position: relative;
  width: 320px;
  height: 320px;
  margin: 0 auto;
}

.keynote-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
}

.keynote-ring {
  position: absolute;
  inset: -12px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  animation: ringPulse 3s infinite;
}

@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.05); opacity: 0.1; }
}

.keynote-info h2 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.keynote-role {
  font-size: 15px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 24px;
}

.keynote-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.keynote-desc em {
  color: var(--gold);
  font-style: italic;
}

.keynote-quote {
  margin: 28px 0;
  padding-left: 20px;
  border-left: 3px solid var(--accent);
}

.keynote-quote blockquote {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}

.keynote-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(0, 194, 184, 0.2);
}

/* ─── Speakers Grid ─── */
/* ═══════════════════
   SESSIONS
   ═══════════════════ */
.sessions {
  background: var(--bg);
}

.experience-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.exp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.exp-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 194, 184, 0.06);
}

.exp-img {
  height: 200px;
  overflow: hidden;
}

.exp-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.exp-card:hover .exp-img img {
  transform: scale(1.05);
}

.exp-content {
  padding: 24px;
}

.exp-type {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
  display: block;
}

.exp-content h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.exp-content p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.schedule-cta {
  text-align: center;
}

/* ═══════════════════
   GALLERY
   ═══════════════════ */
.gallery {
  background: var(--bg-surface);
  padding-bottom: 80px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 220px;
  gap: 8px;
  padding: 0 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.08);
}

.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 194, 184, 0);
  transition: background 0.3s;
}

.gallery-item:hover::after {
  background: rgba(0, 194, 184, 0.1);
}

.gi-large { grid-column: span 2; }
.gi-tall { grid-row: span 2; }

/* ═══════════════════
   REGISTER
   ═══════════════════ */
.register {
  background: linear-gradient(180deg, var(--bg-surface), var(--bg));
}

.register-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 64px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  position: relative;
  overflow: hidden;
}

.register-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow), transparent);
  border-radius: 50%;
  pointer-events: none;
}

.register-content h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.register-content > p {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.pricing-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.price-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.price-card.free {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.price-label {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  min-width: 80px;
  color: var(--text);
}

.price-card.free .price-label {
  color: var(--accent);
}

.price-for {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.4;
}

.register-actions {
  text-align: left;
}

.register-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
  justify-content: center;
}

.detail-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.detail-item svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.detail-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}

.detail-item span {
  font-size: 14px;
  color: var(--text-muted);
}

.detail-item a {
  color: var(--accent);
}

/* ═══════════════════
   FOOTER
   ═══════════════════ */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
}

.footer-brand svg { color: var(--accent); }

.footer-brand-logo {
  height: 80px;
  width: auto;
  object-fit: contain;
}

.footer-hosts {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin: 20px 0 8px;
}

.footer-logo {
  height: 48px;
  width: auto;
  object-fit: contain;
  opacity: 0.85;
  transition: opacity 0.3s ease;
}

.footer-logo:hover {
  opacity: 1;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
}

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

.footer-attr {
  margin-top: 8px;
}

.footer-attr a {
  font-size: 12px;
  color: var(--text-faint);
}

/* ═══════════════════
   LIGHTBOX
   ═══════════════════ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  pointer-events: all;
}

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius);
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  color: white;
  font-size: 32px;
  cursor: pointer;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ═══════════════════
   ANIMATIONS
   ═══════════════════ */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-animate="fade-right"] {
  transform: translateX(-40px);
}

[data-animate="fade-left"] {
  transform: translateX(40px);
}

[data-animate].visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* ═══════════════════
   RESPONSIVE
   ═══════════════════ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: repeat(3, 1fr); }
  .experience-cards { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 180px; }
}

@media (max-width: 768px) {
  .section { padding: 80px 0; }
  
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  
  .hero { padding: 100px 20px 60px; min-height: auto; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 28px; }
  
  .about-grid { grid-template-columns: 1fr; }
  
  .keynote-layout {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .keynote-img-wrap { width: 240px; height: 240px; }
  .keynote-quote { text-align: left; }
  .keynote-tags { justify-content: center; }
  
  .experience-cards { grid-template-columns: 1fr; }
  
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 160px;
  }
  .gi-large { grid-column: span 2; }
  .gi-tall { grid-row: span 1; }
  
  .register-card {
    grid-template-columns: 1fr;
    padding: 32px;
    gap: 40px;
  }

  .marquee-track img { width: 240px; height: 160px; }
}

@media (max-width: 480px) {
  .hero-line { font-size: 36px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .gallery-grid { grid-template-columns: 1fr; grid-auto-rows: 200px; }
  .gi-large { grid-column: span 1; }
}