/* ============================================================
   METIS Workshop — Design System & Styles
   Color palette derived from metis-logo.jpg:
     Primary blue  #1B3A5C
     Accent orange #E87A2E
   ============================================================ */

/* ---------- imports ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ---------- custom properties ---------- */
:root {
  /* palette */
  --blue-900: #0D1F33;
  --blue-800: #132C47;
  --blue-700: #1B3A5C;
  --blue-600: #244B74;
  --blue-500: #2E5D8C;
  --blue-400: #4A7FB5;
  --blue-300: #7BA8D4;
  --blue-200: #B0CEE8;
  --blue-100: #DDE9F4;
  --blue-50:  #F0F5FA;

  --orange-600: #C25E15;
  --orange-500: #E87A2E;
  --orange-400: #F09550;
  --orange-300: #F5B07A;
  --orange-200: #FACDA8;
  --orange-100: #FDE8D4;

  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50:  #F9FAFB;

  --white: #FFFFFF;
  --black: #000000;

  /* semantic */
  --color-primary: var(--blue-700);
  --color-primary-dark: var(--blue-900);
  --color-accent: var(--orange-500);
  --color-accent-dark: var(--orange-600);
  --color-bg: var(--white);
  --color-bg-alt: var(--blue-50);
  --color-bg-dark: var(--blue-900);
  --color-text: var(--gray-800);
  --color-text-light: var(--gray-500);
  --color-text-on-dark: var(--gray-100);

  /* typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* spacing */
  --section-py: 6rem;
  --container-max: 1200px;
  --container-px: 1.5rem;

  /* misc */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.1);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.15);
  --shadow-glow: 0 0 30px rgba(232,122,46,.25);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

/* ---------- reset ---------- */
*, *::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;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---------- utility ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}
.section-padding { padding: var(--section-py) 0; }
.text-center { text-align: center; }
.accent { color: var(--color-accent); }

/* section headings */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-header h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: .75rem;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--orange-300));
}
.section-header p {
  color: var(--color-text-light);
  font-size: 1.1rem;
  max-width: 660px;
  margin: 1rem auto 0;
}

/* reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}
.navbar.scrolled {
  background: rgba(13,31,51,.95);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  padding: .6rem 0;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
}
.nav-logo img {
  height: 42px;
  width: auto;
  border-radius: 50%;
}
.nav-logo span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--white);
  letter-spacing: .5px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  color: rgba(255,255,255,.8);
  font-size: .9rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: var(--color-accent) !important;
  color: var(--white) !important;
  padding: .55rem 1.3rem;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
  transition: background var(--transition), transform var(--transition) !important;
}
.nav-cta:hover {
  background: var(--color-accent-dark) !important;
  transform: translateY(-1px);
}
.nav-cta::after { display: none !important; }

/* hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  padding-top: 120px;
  padding-bottom: 3rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 40%, var(--blue-800) 70%, #1a2744 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 80vw;
  height: 80vw;
  background: radial-gradient(circle, rgba(232,122,46,.15) 0%, transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(74,127,181,.1) 0%, transparent 60%);
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.1); }
}

/* floating particles */
.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-particles span {
  position: absolute;
  background: rgba(255,255,255,.06);
  border-radius: 50%;
  animation: particleFloat linear infinite;
}
@keyframes particleFloat {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  20% { opacity: 1; }
  100% { transform: translateY(-20vh) scale(1); opacity: 0; }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem var(--container-px);
  max-width: 900px;
  margin: auto;
}
.hero-logo {
  width: 100%;
  max-width: 800px;
  height: auto;
  object-fit: contain;
  margin: 0 auto 2rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 0 60px rgba(232,122,46,.3), 0 0 120px rgba(232,122,46,.1);
  animation: logoPulse 4s ease-in-out infinite;
}
@keyframes logoPulse {
  0%, 100% { box-shadow: 0 0 60px rgba(232,122,46,.3), 0 0 120px rgba(232,122,46,.1); }
  50% { box-shadow: 0 0 80px rgba(232,122,46,.4), 0 0 160px rgba(232,122,46,.15); }
}
.hero h1 {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: .5rem;
}
.hero h1 .highlight {
  background: linear-gradient(90deg, var(--orange-400), var(--orange-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255,255,255,.75);
  max-width: 680px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: rgba(255,255,255,.95);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 50px;
  padding: .6rem 2rem .6rem .6rem;
  margin-bottom: 2.5rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
}
.hero-badge img {
  height: 44px;
  width: auto;
}
.hero-badge span {
  color: var(--gray-800);
  font-weight: 600;
  font-size: 1rem;
}
.hero-cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(232,122,46,.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(232,122,46,.45);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.3);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: scrollBounce 2s ease-in-out infinite;
}
.hero-scroll-indicator svg {
  width: 28px;
  height: 28px;
  color: rgba(255,255,255,.4);
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ============================================================
   ABOUT
   ============================================================ */
.about {
  background: var(--color-bg);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about-image {
  position: relative;
  position: sticky;
  top: 6rem;
}
.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: auto;
}
.about-image::after {
  display: none;
}
.about-text h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.about-text p {
  color: var(--gray-600);
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
}
.about-mythology {
  background: var(--blue-50);
  border-left: 4px solid var(--color-accent);
  padding: 1.2rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 1.5rem;
}
.about-mythology p {
  font-style: italic;
  color: var(--gray-700);
  margin-bottom: 0;
  font-size: .95rem;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
.stat-item {
  text-align: center;
}
.stat-number {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
}
.stat-label {
  font-size: .85rem;
  color: var(--gray-500);
  margin-top: .25rem;
}

/* ============================================================
   CALL FOR PAPERS / TRACKS
   ============================================================ */
.tracks {
  background: linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
}
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.track-card {
  background: rgba(255,255,255,.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(27,58,92,.08);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.track-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.track-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}
.track-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500));
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
}
.track-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 1rem;
  line-height: 1.35;
}
.track-card ul {
  list-style: none;
  padding: 0;
}
.track-card li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--gray-600);
  font-size: .93rem;
  margin-bottom: .6rem;
  line-height: 1.5;
}
.track-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: .55rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* submission guidelines */
.submission-info {
  margin-top: 3rem;
  background: var(--white);
  border: 1px solid rgba(27,58,92,.1);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}
.submission-info h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 1.5rem;
}
.submission-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.submission-detail {
  padding: .75rem 1rem;
  background: var(--blue-50);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  color: var(--gray-700);
  line-height: 1.6;
}
.submission-detail strong {
  color: var(--color-primary-dark);
}
.submission-detail a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}
.submission-detail a:hover {
  color: var(--color-accent-dark);
}

/* ============================================================
   IMPORTANT DATES
   ============================================================ */
.dates {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}
.dates .section-header h2 {
  color: var(--white);
}
.dates .section-header p {
  color: rgba(255,255,255,.6);
}
.dates .section-header h2::after {
  background: linear-gradient(90deg, var(--orange-500), var(--orange-300));
}

.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding: 1rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 30px;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-accent), var(--blue-500));
}
.timeline-item {
  position: relative;
  padding-left: 80px;
  padding-bottom: 2.5rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: 20px;
  top: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-bg-dark);
  border: 3px solid var(--color-accent);
  z-index: 1;
}
.timeline-dot::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}
.timeline-item h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: .35rem;
}
.timeline-item .date-value {
  color: var(--orange-300);
  font-weight: 600;
  font-size: 1rem;
}

/* ============================================================
   PROGRAM
   ============================================================ */
.program {
  background: var(--color-bg);
}
.program-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}
.program-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition);
}
.program-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.program-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--blue-100), var(--blue-50));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.program-item h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-primary-dark);
  margin-bottom: .3rem;
}
.program-item p {
  color: var(--gray-500);
  font-size: .9rem;
}

/* ============================================================
   AWARDS
   ============================================================ */
.awards {
  background: linear-gradient(135deg, var(--blue-800) 0%, var(--blue-900) 100%);
  color: var(--white);
}
.awards .section-header h2 { color: var(--white); }
.awards .section-header p { color: rgba(255,255,255,.6); }
.awards .section-header h2::after {
  background: linear-gradient(90deg, var(--orange-500), var(--orange-300));
}
.awards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}
.award-card {
  text-align: center;
  padding: 2rem 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), background var(--transition);
}
.award-card:hover {
  transform: translateY(-4px);
  background: rgba(255,255,255,.1);
}
.award-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}
.award-card h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: .5rem;
}
.award-card p {
  font-size: .85rem;
  color: rgba(255,255,255,.6);
  line-height: 1.5;
}

/* ============================================================
   ORGANIZERS
   ============================================================ */
.organizers {
  background: var(--color-bg-alt);
}
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}
.organizer-card {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  transition: transform var(--transition), box-shadow var(--transition);
}
.organizer-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}
.organizer-photo {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  margin: 0 auto 1.25rem;
  object-fit: cover;
  border: 3px solid var(--blue-200);
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.organizer-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.organizer-photo .placeholder-initials {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--blue-400);
}
.organizer-card h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-primary-dark);
  margin-bottom: .25rem;
}
.organizer-role {
  font-size: .85rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: .35rem;
}
.organizer-affiliation {
  font-size: .85rem;
  color: var(--gray-500);
}

/* ============================================================
   CONTACT / FOOTER
   ============================================================ */
.footer {
  background: var(--blue-900);
  color: rgba(255,255,255,.7);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}
.footer-brand img {
  height: 50px;
  margin-bottom: 1rem;
  border-radius: 50%;
}
.footer-brand p {
  font-size: .9rem;
  line-height: 1.6;
  max-width: 300px;
}
.footer h5 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--white);
  margin-bottom: 1rem;
  font-size: 1rem;
}
.footer-links a {
  display: block;
  font-size: .9rem;
  margin-bottom: .6rem;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--color-accent); }
.footer-contact a {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  margin-bottom: .6rem;
  transition: color var(--transition);
}
.footer-contact a:hover { color: var(--color-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
}
.footer-bottom a {
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--color-accent); }

/* ============================================================
   CHAT WIDGET
   ============================================================ */
.chat-toggle {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(232,122,46,.4);
  z-index: 999;
  transition: transform var(--transition), box-shadow var(--transition);
}
.chat-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 30px rgba(232,122,46,.5);
}
.chat-toggle svg {
  width: 28px;
  height: 28px;
  fill: var(--white);
  transition: transform var(--transition);
}
.chat-toggle.active svg {
  transform: rotate(90deg);
}

.chat-window {
  position: fixed;
  bottom: 6.5rem;
  right: 2rem;
  width: 400px;
  max-height: 520px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  z-index: 998;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px) scale(.95);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
}
.chat-window.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.chat-header {
  background: linear-gradient(135deg, var(--blue-700), var(--blue-800));
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.chat-header-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}
.chat-header-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.chat-header-info h4 {
  color: var(--white);
  font-family: var(--font-heading);
  font-size: .95rem;
  font-weight: 600;
}
.chat-header-info p {
  color: rgba(255,255,255,.6);
  font-size: .75rem;
}

.chat-messages {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  max-height: 350px;
  min-height: 250px;
}
.chat-message {
  max-width: 85%;
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  line-height: 1.5;
  animation: msgFade .3s ease;
}
@keyframes msgFade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.chat-message.bot {
  align-self: flex-start;
  background: var(--blue-50);
  color: var(--gray-800);
  border-bottom-left-radius: 4px;
}
.chat-message.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
  color: var(--white);
  border-bottom-right-radius: 4px;
}
.chat-message a {
  color: var(--color-accent);
  text-decoration: underline;
  font-weight: 500;
}

.typing-indicator {
  display: none;
  align-self: flex-start;
  padding: .75rem 1rem;
  background: var(--blue-50);
  border-radius: var(--radius-sm);
  border-bottom-left-radius: 4px;
}
.typing-indicator.visible { display: flex; gap: .3rem; }
.typing-indicator span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue-300);
  animation: typingDot 1.4s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: .2s; }
.typing-indicator span:nth-child(3) { animation-delay: .4s; }
@keyframes typingDot {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

.chat-input-area {
  display: flex;
  padding: .75rem;
  border-top: 1px solid var(--gray-200);
  gap: .5rem;
}
.chat-input-area input {
  flex: 1;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  padding: .65rem 1rem;
  font-family: var(--font-body);
  font-size: .9rem;
  outline: none;
  transition: border-color var(--transition);
}
.chat-input-area input:focus {
  border-color: var(--color-primary);
}
.chat-input-area button {
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  border: none;
  border-radius: var(--radius-sm);
  width: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition);
}
.chat-input-area button:hover { transform: scale(1.05); }
.chat-input-area button svg {
  width: 20px;
  height: 20px;
  fill: var(--white);
}

.chat-escalate {
  padding: .6rem 1rem;
  background: var(--orange-100);
  text-align: center;
  font-size: .8rem;
  color: var(--gray-600);
}
.chat-escalate a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .organizers-grid,
  .awards-grid { grid-template-columns: repeat(2, 1fr); }
  .tracks-grid { grid-template-columns: 1fr; max-width: 600px; margin: 0 auto; }
  .about-grid { grid-template-columns: 1fr; }
  .about-image { order: -1; max-width: 500px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  :root {
    --section-py: 4rem;
  }
  .section-header h2 { font-size: 2rem; }
  .hero h1 { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1rem; }

  .nav-links {
    position: fixed;
    top: 0; right: 0;
    width: 280px;
    height: 100vh;
    background: rgba(13,31,51,.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform .4s ease;
    z-index: 1000;
  }
  .nav-links.active { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; }
  .hamburger { display: flex; }

  /* Disable About image sliding/floating on mobile */
  .about-image.reveal {
    transform: none !important;
    opacity: 1 !important;
    transition: none !important;
  }
  .floating-img { animation: none !important; }

  .program-grid { grid-template-columns: 1fr; }
  .organizers-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .awards-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: .5rem; text-align: center; }

  .chat-window {
    width: calc(100vw - 2rem);
    right: 1rem;
    bottom: 5.5rem;
    max-height: 70vh;
  }
  .chat-toggle {
    width: 52px;
    height: 52px;
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.75rem; }
  .hero-cta-group { flex-direction: column; align-items: center; }
  .organizers-grid { grid-template-columns: 1fr; max-width: 280px; margin: 0 auto; }
  .about-stats { grid-template-columns: 1fr; gap: 1rem; }
}