@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+Tamil&display=swap");


/* RESET & BASE STYLES */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  min-height: 100vh;
 

  background-size: cover;
  background-position: center;
  
}
.bg{
  background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url("assets/hero_bg.jpg") no-repeat;
  background-color: #1a1d23;;
}

/* Base Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

/* Body */
body {
  min-height: 100vh;
  background-size: cover;
  background-position: center;
}

.bg {
  background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url("assets/hero_bg.jpg") no-repeat;
  background-color: #1a1d23;
}


.main-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 13px 80px;
  background:linear-gradient(135deg, hsl(217, 92%, 60%), hsl(178, 70%, 50%), hsl(42, 88%, 60%));
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 999;
}

.logo img {
  height: 60px;
  object-fit: contain;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-size: 14px;
  transition: 0.3s;
  font-weight: 500;
}

.nav-links a:hover {
  color: #8c39ff;
}

/* Register button */
.glow-button {
  background-color: #8c39ff;
  color: white;
  padding: 8px 18px;
  border-radius: 5px;
  font-size: 13.5px;
  transition: 0.3s;
  text-decoration: none;
}
.glow-button:hover {
  background-color: #a75bff;
}

/* Menu toggle (mobile) */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.8rem;
}

/* RESPONSIVE STYLES */
@media (max-width: 1024px) {
  .main-header {
    padding: 13px 40px;
  }

  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .main-header {
    padding: 16px 20px;
    flex-wrap: wrap;
  }

  .logo img {
    height: 50px;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background-color: #111;
    margin-top: 15px;
    padding: 20px;
    gap: 16px;
  }

  .nav-links.show {
    display: flex;
  }

  .glow-button {
    width: 100%;
    text-align: center;
    font-size: 14px;
  }
}


.hero-section {
  padding: 90px 0;
    
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.4rem;
    text-align: center;
  }
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-top: 1rem;
  line-height: 1.6;
}

/* Color Styling */
.purple-text {
  color: #6a1b9a; /* Royal Purple */
}

.gold-text {
  color: #f4c916; /* Elegant Gold */
}

.hero-img {
  max-width: 100%;
  border-radius: 10px;
}

.hero-subtitle {
  font-size: 1.1rem;
  font-weight: 500;
  color: #fff;
  font-family: 'Poppins', sans-serif;
}

.tamil-text {
  font-size: 1.05rem;
  line-height: 1.6;
  font-weight: 500;
  color:  #8c39ff;
  font-family: 'Noto Sans Tamil', sans-serif;
}

.organized-text {
  font-weight: 600;
  color: #8c39ff;
  font-size: 0.95rem;
}

/* Sponsor Section Styling */
.sponsored-by {
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.5rem;
}

.sponsor-imgs {
  gap: 2rem;
}

.sponsor-img {
  max-height: 70px;
  width: auto;
  object-fit: contain;
}

@media (max-width: 576px) {
  .sponsor-img {
    max-height: 50px;
    margin-bottom: 0.5rem;
  }

  .sponsor-imgs {
    justify-content: center !important;
  }
}

.card-gradient {
  background: linear-gradient(145deg, #ffffff, #f3f3f3);
  border: 1px solid #ddd;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-radius: 12px;
}

.card-gradient:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}
/* Root color variables using HSL for theme control */
:root {
  --primary: hsl(217, 92%, 60%);
  --primary-glow: hsl(217, 92%, 75%);
  --secondary: hsl(42, 88%, 60%);
  --secondary-glow: hsl(42, 88%, 75%);
  --tertiary: hsl(178, 70%, 50%);
  --tertiary-glow: hsl(178, 70%, 65%);
  --background: transparent;
  --card-bg: linear-gradient(145deg, #1a1d23, hsl(220, 15%, 10%));
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 50px rgba(0, 136, 255, 0.3);
  --radius: 12px;
  --text-dark: #222;
  --text-muted: #666;
  --badge-bg: rgba(0, 136, 255, 0.1);
}

/* Grid layout */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 1024px;
  margin: 0 auto;
  padding: 2rem;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Card style */
.info-card {
  background: var(--card-bg);
  color: white;
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.info-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* Icon style */
.card-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

/* Text styling */
.card-title {
  font-weight: 600;
  font-size: 1.1rem;
}

.card-sub {
  font-size: 0.875rem;
  color: #ccc;
}

/* Color modifiers (optional if needed) */
.text-primary {
  color: var(--primary);
}
.text-secondary {
  color: var(--secondary);
}
.text-tertiary {
  color: var(--tertiary);
}
.speakers-section {
  padding: 80px 20px;
  background-color:#1a1d23;
}

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

/* Header */
.speakers-header {
  text-align: center;
  margin-bottom: 60px;
}

.speakers-title {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--tertiary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.speakers-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-top: 10px;
}

/* Grid */
.speakers-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .speakers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .speakers-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Card */
.speaker-card {
  background: var(--card-bg);
  color: white;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.speaker-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 50px rgba(0, 136, 255, 0.3);
}

/* Container with fixed aspect ratio and overflow */
.speaker-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio:0.5/0.5; /* Makes it square */
  overflow: hidden;
  border-radius: 12px;
}

/* Image fits and centers without distortion */
.speaker-img {
  width: 100%;
  height: 100%;
  object-fit: cover;         /* Crop to fill */
  object-position: center;   /* Center the face */
  transition: transform 0.3s ease;
}

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


.overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  opacity: 0;
  transition: 0.3s ease;
}
.speaker-card:hover .overlay {
  opacity: 1;
}

/* Social */
.social-links {
  position: absolute;
  bottom: 10px;
  left: 10px;
  display: flex;
  gap: 10px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.speaker-card:hover .social-links {
  opacity: 1;
}
.social-links a {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  padding: 8px;
  border-radius: 50%;
  
}
.social-links a:hover {
  background: var(--primary);
}

/* Info */
.speaker-content {
  padding: 20px;
}
.speaker-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 5px;
}
.speaker-title {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 5px;
}
.speaker-company {
  color: #f3bd3f;
  font-size: 0.9rem;
  margin-bottom: 10px;
}
.speaker-bio {
  font-size: 0.9rem;
  color: #ccc;
  margin-bottom: 15px;
  line-height: 1.5;
}

/* Tags */
.speaker-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tag {
  font-size: 0.75rem;
  background: var(--badge-bg);
  color: var(--primary);
  padding: 4px 8px;
  border-radius: 20px;
  transition: 0.3s ease;
}
.tag:hover {
  background: var(--primary);
  color: white;
}

/* Call to Action */
.cta {
  text-align: center;
  margin-top: 60px;
}
.cta-text {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.pulse {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
  font-weight: 600;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulseDot 1s infinite alternate;
}
@keyframes pulseDot {
  from {
    opacity: 0.3;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1.2);
  }
}

.schedule-section-icons {
  background: #222;
  padding: 60px 0;
}

.section-heading {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, hsl(217, 92%, 60%), #26d9d3, hsl(42, 88%, 60%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin-bottom: 40px;
}

.timeline {
  position: relative;
  margin: 0 auto;
  padding-left: 7px;
  border-left: 4px solid hsl(217, 92%, 60%);
  max-width: 800px;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 40px;
}

.timeline-icon {
  position: absolute;
  left: -28px;
  top: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, hsl(217, 92%, 60%), hsl(42, 88%, 60%));
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 40px;
  font-size: 18px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.1);
  z-index: 10;
}

.bg-purple {
  background: hsl(217, 92%, 60%);
}

.bg-gold {
  background: hsl(42, 88%, 60%);
}

.timeline-content {
  background:#1a1d23;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  border-left: 6px solid hsl(217, 92%, 60%);
}

.timeline-content:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.session-day {
  font-size: 0.9rem;
  color: #fff;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.4rem;
  display: block;
}

.session-title {
  font-size: 1.2rem;
  font-weight: 700;
  color:#ddd;
  margin: 0;
}

.session-role {
  font-size: 0.95rem;
  font-weight: 500;
  color: hsl(178, 70%, 45%);
  margin: 4px 0;
}

.session-topic {
  font-size: 1rem;
  color: #ddd;
  margin-top: 6px;
}
.glow-button {
  background: hsl(217, 92%, 60%);
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 5px 20px hsla(217, 92%, 60%, 0.4);
}

.glow-button:hover {
  box-shadow: 0 8px 30px hsla(217, 92%, 60%, 0.6);
  transform: translateY(-2px);
}

.pulse-glow {
  animation: pulseGlow 2s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
  from {
    box-shadow: 0 0 20px hsla(217, 92%, 60%, 0.3);
  }
  to {
    box-shadow: 0 0 40px hsla(217, 92%, 60%, 0.6);
  }
}
.venue-section {
  background-color: #1a1d23;
  padding: 60px 0;
}

.section-heading {
  font-size: 2rem;
  font-weight: 700;
}

.venue-subtitle {
  font-size: 1rem;
  line-height: 1.6;
  color: #ddd;
}

.map-container {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
  max-width: 100%;
}
.about-section {
  background-color: #222;
  color: #eee;
}

.about-text {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  color: #ccc;
}

.section-heading {
  font-size: 2rem;
  font-weight: 700;
  color: hsl(217, 92%, 70%);
}

.about-section img {
  border-radius: 10px;
 
}


.registration-zigzag-section {
  background-color: #222;
  color: #eee;
  padding: 60px 20px;
}

.section-heading {
  font-size: 2.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, hsl(217, 92%, 60%), hsl(178, 70%, 50%), hsl(42, 88%, 60%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.description {
  max-width: 700px;
  margin: 0 auto;
  color: #ccc;
  font-size: 1.1rem;
}

.download-pdf {
  color: hsl(42, 88%, 70%);
  text-decoration: underline;
  font-weight: 500;
}

.reg-step {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.reg-step.reverse {
  flex-direction: row-reverse;
}

.reg-img {
  flex: 1 1 40%;
  max-width: 500px;
}

.reg-img img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s;
}

.reg-img img:hover {
  transform: scale(1.03);
}

.reg-content {
  flex: 1 1 50%;
  padding: 20px;
}

.reg-content h4 {
  font-size: 1.6rem;
  margin-bottom: 10px;
  color: hsl(217, 92%, 70%);
}

.reg-content p {
  font-size: 1.05rem;
  color: #ddd;
  line-height: 1.6;
}

/* Responsive Fix */
@media (max-width: 768px) {
  .reg-step,
  .reg-step.reverse {
    flex-direction: column;
    text-align: center;
  }

  .reg-img,
  .reg-content {
    flex: 1 1 100%;
  }

  .reg-content {
    padding: 0;
  }
}
.lightbox-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.9);
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.lightbox-overlay img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}
.filter-list {
  list-style-type: disc;
  padding-left: 1.5rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}
.footer-section {
  background-color: #111;
  color: #ccc;
  padding: 40px 20px 20px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
  align-items: flex-start;
}

.footer-col {
  flex: 1 1 300px;
}



.footer-desc {
  font-size: 0.9rem;
  color: #aaa;
}

.footer-col h4 {
  color: #fff;
  margin-bottom: 15px;
  font-size: 1.1rem;
  border-bottom: 2px solid #444;
  padding-bottom: 5px;
}

.footer-links,
.footer-contact {
  list-style: none;
  padding: 0;
}

.footer-links li,
.footer-contact li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-contact i {
  margin-right: 8px;
  color: #f5c542;
}

.footer-bottom {
  border-top: 1px solid #333;
  margin-top: 30px;
  padding-top: 15px;
  font-size: 0.85rem;
  color: #888;
}
.college-branding {
  text-align: right;
}

.college-branding .college-name {
  color: #f8e112; /* Bright gold/yellow for highlight */
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0;
}

.college-branding .college-location {
  color: #ccc;
  font-size: 0.95rem;
}

.footer-logo {
  width: 80px;
  margin: 10px auto 0 auto;
  display: block;
}
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background-color: var(--tertiary-glow);
  color: white;
  border: none;
  padding: 12px 16px;
  font-size: 20px;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  z-index: 9999;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
  transition: background 0.3s ease;
}

.back-to-top:hover {
  background-color: var(--secondary-glow);
}