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

:root {
  --primary: #f8fafc;
  --primary-mid: #e2e8f0;
  --primary-light: #3b82f6;
  --accent: #0284c7;
  --accent-glow: #0369a1;
  --accent-warm: #ea580c;
  --accent-rose: #e11d48;
  --text: #0f172a;
  --text-muted: #475569;
  --text-dark: #020617;
  --bg-dark: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.6);
  --border-glass: rgba(255, 255, 255, 0.5);
  --border-glow: rgba(2, 132, 199, 0.3);
  --gradient-main: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f8fafc 100%);
  --gradient-accent: linear-gradient(135deg, #0284c7, #3b82f6, #6366f1);
  --gradient-warm: linear-gradient(135deg, #ea580c, #dc2626);
  --sidebar-width: 240px;
  --radius: 16px;
  --radius-sm: 8px;
  --radius-pill: 50px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg-dark);
  background-image: url('Background.png');
  background-size: cover;
  background-attachment: fixed;
  background-position: center;
  min-height: 100vh;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, .font-heading {
  font-family: 'Outfit', sans-serif;
}

/* ===== Animated Background Overlay ===== */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(255, 255, 255, 0.1); /* Very light overlay initially */
  z-index: -2;
  transition: all 0.5s ease;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
}

body.scrolled::before {
  background: rgba(255, 255, 255, 0.65); /* Stronger white glass effect when scrolled */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, rgba(6, 182, 212, 0.12) 0%, transparent 100%),
    radial-gradient(ellipse 500px 500px at 80% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 100%),
    radial-gradient(ellipse 400px 300px at 60% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 100%);
  z-index: -1;
  animation: bgPulse 8s ease-in-out infinite alternate;
}
@keyframes bgPulse {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* ===== Floating Particles Canvas ===== */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* ===== Top Bar ===== */
#top-bar {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  color: var(--text-muted);
  padding: 8px 24px;
  font-size: 12px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}
#top-bar a { color: var(--text-muted); font-size: 12px; transition: color var(--transition); }
#top-bar a:hover { color: var(--accent-glow); }

/* ===== Language Pill Switcher ===== */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
}
.lang-switcher span { color: var(--text-muted); }

/* Modern pill-style language selector */
#lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-glass);
  color: var(--text);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-pill);
  padding: 4px 28px 4px 12px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}
#lang-select:hover {
  border-color: var(--accent);
  background-color: rgba(6, 182, 212, 0.1);
}
#lang-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}
#lang-select option {
  background: var(--primary);
  color: var(--text);
  padding: 8px;
}

/* ===== Header ===== */
#site-header {
  background: var(--bg-card);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-bottom: 1px solid var(--border-glass);
  padding: 48px 40px 40px;
  position: relative;
  text-align: center;
  overflow: hidden;
}
#site-header::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: conic-gradient(from 0deg at 50% 50%,
    transparent 0deg,
    rgba(6, 182, 212, 0.04) 60deg,
    transparent 120deg,
    rgba(139, 92, 246, 0.04) 180deg,
    transparent 240deg,
    rgba(59, 130, 246, 0.04) 300deg,
    transparent 360deg
  );
  animation: headerRotate 30s linear infinite;
  z-index: 0;
}
@keyframes headerRotate {
  to { transform: rotate(360deg); }
}
#site-header > * { position: relative; z-index: 1; }
#site-header h1 {
  font-size: 42px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  letter-spacing: -1px;
  line-height: 1.2;
}
#site-header .event-meta {
  font-size: 22px;
  color: var(--accent-warm);
  font-weight: 700;
  margin-bottom: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
#site-header .event-meta::before {
  content: '📅';
}
#site-header .event-location {
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.header-location-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 4px;
}
.header-map-btn {
  display: inline-flex;
  align-items: center;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-glow);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  transition: all var(--transition);
  text-decoration: none !important;
}
.header-map-btn:hover {
  background: var(--accent);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}
#site-header .event-tz {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Countdown Timer ===== */
.countdown-bar {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-glass);
}
.countdown-unit {
  text-align: center;
}
.countdown-unit .number {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.countdown-unit .label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* ===== Layout ===== */
#page-body {
  display: flex;
  min-height: calc(100vh - 200px);
  max-width: 1400px;
  margin: 55vh auto 0; /* Massive top margin to reveal the fixed background image */
  padding: 32px 24px;
  gap: 32px;
}

/* ===== Sidebar ===== */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 0;
  position: sticky;
  top: 52px;
  height: fit-content;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

#sidebar nav ul { list-style: none; }
#sidebar nav ul li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  font-size: 13.5px;
  color: var(--text-muted);
  border-left: 3px solid transparent;
  transition: all var(--transition);
  position: relative;
}
#sidebar nav ul li a::before {
  content: '';
  position: absolute;
  left: 0; top: 0;
  width: 0; height: 100%;
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.1), transparent);
  transition: width var(--transition);
}
#sidebar nav ul li a:hover {
  color: var(--text);
  text-decoration: none;
}
#sidebar nav ul li a:hover::before {
  width: 100%;
}
#sidebar nav ul li a.active {
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.15), transparent);
  border-left-color: var(--accent);
  color: var(--accent-glow);
  font-weight: 600;
}

.sidebar-section-header {
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.2), rgba(59, 130, 246, 0.1));
  color: var(--accent-glow);
  font-size: 11px;
  font-weight: 700;
  padding: 10px 20px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border-top: 1px solid var(--border-glass);
}

.sidebar-contact { padding: 14px 20px; }
.sidebar-contact a {
  font-size: 12.5px;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 6px;
}
.sidebar-contact a:hover { color: var(--accent-glow); }

/* ===== Main Content ===== */
#main-content {
  flex: 1;
  padding: 0;
  max-width: 900px;
  background: transparent;
}

/* ===== Page Sections (Glass Cards) ===== */
.page-section {
  display: none;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 48px;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-glass);
  animation: sectionFadeIn 0.5s ease-out;
}
.page-section.active { display: block; }

@keyframes sectionFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.programme-item-body.active {
  display: block;
}

/* ===== Speaker Block ===== */
.speaker-block {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 12px;
}
.speaker-photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--border-glass);
  transition: border-color var(--transition);
}
.speaker-photo:hover { border-color: var(--accent); }
.speaker-info { flex: 1; }
.speaker-name {
  display: block;
  font-weight: 700;
  color: var(--accent-glow);
  margin-bottom: 6px;
  font-size: 15px;
}

/* ===== Content Typography ===== */
#main-content h2 {
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 28px;
  padding-bottom: 16px;
  letter-spacing: -0.5px;
  border-bottom: 1px solid var(--border-glass);
}
#main-content h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-warm);
  margin: 32px 0 12px;
}
#main-content h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 20px 0 10px;
}
#main-content p { margin-bottom: 14px; line-height: 1.7; color: var(--text); }
#main-content ul {
  margin: 8px 0 14px 24px;
  line-height: 1.7;
}
#main-content li {
  margin-bottom: 6px;
  color: var(--text);
}
#main-content li::marker {
  color: var(--accent);
}

/* ===== Hero Image ===== */
.event-hero {
  display: flex;
  gap: 24px;
  margin-bottom: 28px;
  align-items: flex-start;
}
.event-hero img {
  width: 320px;
  max-width: 100%;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-glass);
}
.event-hero-text { flex: 1; }
.event-highlight {
  font-size: 24px;
  list-style: none;
  margin-bottom: 20px;
  line-height: 1.3;
  color: var(--text);
}
.event-highlight strong {
  color: var(--accent-warm);
  font-size: 28px;
  display: block;
  margin-bottom: 2px;
}

/* ===== Info Boxes ===== */
.info-box {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-left: 4px solid var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  margin: 16px 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text);
}
.info-box.note {
  border-left-color: var(--accent-warm);
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.2);
}
.info-box .info-icon { color: var(--accent-warm); font-weight: bold; margin-right: 6px; }

blockquote {
  border-left: 3px solid var(--border-glass);
  padding: 10px 20px;
  margin: 16px 0;
  color: var(--text-muted);
  font-style: italic;
  background: var(--bg-glass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ===== Timetable — Modern Segmented Control ===== */
.timetable-days {
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  padding: 4px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.timetable-days button {
  flex: 1;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.timetable-days button:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}
.timetable-days button.active {
  background: var(--gradient-accent);
  color: white;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.timetable-day { display: none; }
.timetable-day.active { display: block; animation: sectionFadeIn 0.4s ease-out; }

.timetable-day h3 {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-glass);
}

.timetable-entry {
  display: flex;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  align-items: flex-start;
  transition: all var(--transition);
}
.timetable-entry:hover {
  transform: translateX(4px);
}
.timetable-time {
  min-width: 55px;
  font-size: 13px;
  color: var(--accent);
  font-weight: 700;
  font-family: 'Outfit', monospace;
  padding-top: 12px;
}
.timetable-item {
  flex: 1;
  background: rgba(245, 158, 11, 0.06);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-left: 4px solid var(--accent-warm);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-size: 14px;
  color: var(--text);
  transition: all var(--transition);
}
.timetable-item:hover {
  background: rgba(245, 158, 11, 0.1);
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.1);
}
.timetable-item.registration {
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.2);
  border-left-color: var(--primary-light);
}
.timetable-item.social {
  background: rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.2);
  border-left-color: #8b5cf6;
}
.timetable-item .item-location {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 6px;
}
.timetable-item .speaker-label {
  font-size: 12px;
  color: var(--accent-glow);
  font-weight: 600;
  margin-top: 4px;
}
.timetable-item.break {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-glass);
  border-left-color: var(--text-muted);
  font-style: italic;
  opacity: 0.8;
}
.timetable-item.lab {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.2);
  border-left-color: #10b981;
}

/* ===== Contributions ===== */
.contribution-card {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.contribution-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition);
}
.contribution-card:hover {
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.15);
  transform: translateY(-4px);
  border-color: var(--border-glow);
}
.contribution-card:hover::before { opacity: 1; }

.contribution-card .contrib-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-glow);
  margin-bottom: 8px;
}
.contribution-card .contrib-speaker {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.contribution-card .contrib-speaker .speaker-name {
  font-weight: 600;
  color: var(--text);
}
.contribution-card .contrib-time {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.contribution-card .contrib-type {
  display: inline-block;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.contribution-card .contrib-abstract {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}
.contribution-card .contrib-num { color: var(--accent); margin-right: 4px; }

/* ===== Registration ===== */
.reg-notice {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--text);
}
.reg-notice .reg-icon { font-size: 24px; flex-shrink: 0; }
.reg-notice a { font-weight: 600; }
.reg-notice strong { color: var(--text); }

/* ===== FAQs ===== */
.faq-item {
  border-bottom: 1px solid var(--border-glass);
  padding: 16px 0;
}
.faq-q {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-warm);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  transition: color var(--transition);
}
.faq-q:hover { color: var(--accent-glow); }
.faq-q::after {
  content: '+';
  font-size: 18px;
  font-weight: 300;
  color: var(--accent);
  transition: transform var(--transition);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.1);
  flex-shrink: 0;
}
.faq-q.open::after {
  content: '−';
  transform: rotate(180deg);
  background: rgba(6, 182, 212, 0.2);
}
.faq-a {
  display: none;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  padding-left: 4px;
  border-left: 2px solid var(--border-glass);
  padding-left: 16px;
}
.faq-a.open {
  display: block;
  animation: sectionFadeIn 0.3s ease-out;
}
.faq-a ul { margin: 8px 0 8px 24px; }

/* ===== Chairpersons ===== */
.chairpersons-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}
.chairperson-tag {
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: var(--radius-pill);
  padding: 6px 18px;
  font-size: 13px;
  color: var(--accent-glow);
  font-weight: 500;
  transition: all var(--transition);
  cursor: default;
}
.chairperson-tag:hover {
  background: rgba(6, 182, 212, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.15);
}

/* ===== Scientific Programme Items ===== */
.programme-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.02);
  transition: all var(--transition);
}
.programme-item:hover {
  border-color: var(--border-glow);
}
.programme-item-header {
  background: rgba(255, 255, 255, 0.04);
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-glass);
  transition: all var(--transition);
}
.programme-item-header span {
  color: var(--accent);
  transition: transform var(--transition);
  font-size: 14px;
}
.programme-item-header:hover {
  background: rgba(6, 182, 212, 0.06);
  color: var(--accent-glow);
}
.programme-item-body {
  padding: 20px 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ===== Footer ===== */
#site-footer {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-glass);
  padding: 20px 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 40px;
}
#site-footer a { color: var(--text-muted); }
#site-footer a:hover { color: var(--accent); }

/* ===== Register Button — Glowing CTA ===== */
.register-btn {
  display: inline-block;
  background: var(--gradient-accent);
  color: #fff !important;
  padding: 11px 28px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  font-family: inherit;
  margin-top: 16px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.25);
  position: relative;
  letter-spacing: 0.3px;
}
.register-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.4);
  text-decoration: none !important;
}
.register-btn:active {
  transform: translateY(-1px);
}

/* ===== Sidebar Dates Box ===== */
.sidebar-info-box {
  border-top: 1px solid var(--border-glass);
  padding: 14px 20px;
  font-size: 13px;
  color: var(--text-muted);
}
.sidebar-info-box h4 {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #sidebar { display: none; }
  .event-hero { flex-direction: column; }
  .event-hero img { width: 100%; }
  #main-content { margin: 0; }
  #page-body {
    padding: 16px;
    flex-direction: column;
  }
  .page-section { padding: 28px 20px; }
  #site-header { padding: 32px 20px; }
  #site-header h1 { font-size: 28px; }
  .countdown-bar { gap: 16px; }
  .countdown-unit .number { font-size: 24px; }
  .timetable-days { flex-wrap: wrap; }
  .timetable-days button { flex: none; }

  /* Mobile bottom nav */
  .mobile-nav {
    display: flex !important;
  }
}

/* ===== Mobile Bottom Nav ===== */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-glass);
  padding: 8px 4px;
  z-index: 200;
  justify-content: space-around;
  gap: 4px;
  overflow-x: auto;
}
.mobile-nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 10px;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.mobile-nav a.active {
  color: var(--accent-glow);
  background: rgba(6, 182, 212, 0.1);
}
.mobile-nav a .nav-icon { font-size: 18px; }

/* ===== Auth Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(2, 6, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal-box {
  background: var(--primary-mid);
  border: 1px solid var(--border-glass);
  padding: 40px;
  border-radius: var(--radius);
  width: 90%;
  max-width: 420px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transform: translateY(-20px);
  transition: transform 0.3s;
}
.modal-overlay.active .modal-box {
  transform: translateY(0);
}
.close-modal {
  position: absolute;
  top: 16px; right: 20px;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition);
}
.close-modal:hover { color: var(--accent); }
.modal-box h2 {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
  font-size: 24px;
}
.auth-form-group {
  margin-bottom: 18px;
}
.auth-form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.auth-form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  transition: all var(--transition);
}
.auth-form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}
.auth-form-group input::placeholder {
  color: var(--text-muted);
}
.auth-switch-text {
  text-align: center;
  font-size: 13px;
  margin-top: 20px;
  color: var(--text-muted);
}

/* ===== Glow animation for key elements ===== */
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(6, 182, 212, 0.1); }
  50% { box-shadow: 0 0 30px rgba(6, 182, 212, 0.2); }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(148, 163, 184, 0.5); }

/* ===== Selection ===== */
::selection {
  background: rgba(6, 182, 212, 0.3);
  color: white;
}

/* ===== Logos & Support Sections ===== */
.header-univ-logo {
  height: 48px;
  width: auto;
  border-radius: 50%;
  border: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.9);
  padding: 1px;
}

.support-logos-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.support-logo-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 12px 10px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 140px;
  text-align: center;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}

.support-logo-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.1);
}

.support-logo {
  height: 32px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  margin-bottom: 8px;
}

.support-logo.horizontal {
  height: 22px;
  margin-bottom: 18px; /* Balance proportions with circular logo */
}

.support-logo-text {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
}