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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-weight: bold;
    font-size: 1.25rem;
    cursor: pointer;
}

.logo img {
    width: 210px;
    height: 60px;
}

.nav-links {
    display: none;
    list-style: none;
    gap: 2rem;
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #ec4899;
}

.btn-primary {
    background: #2068B3;
    color: white;
    border: none;
    text-decoration: none;
    padding: 0.25rem 1.25rem;
    border-radius: 9999px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #7e22ce;
}
.submenu {
    display: none;
    position: absolute;
    background: white;
    list-style: none;
    margin: 0;
    padding: 8px 0;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15);
    border-radius: 6px;
    min-width: 180px;
    z-index: 1000;
}

li:hover > .submenu {
    display: block;
}
.submenu li a {
    display: block;
    padding: 10px 15px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    white-space: nowrap;
}

.submenu li a:hover {
    background: #f0f0f0;
    color: #000;
}

/* ===== PAGE BACKGROUND ===== */
.paper-center {
  position: relative;
  min-height: 100vh;
  padding-top: 120px; /* for fixed navbar */
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(0deg, #0066cc, #0066cc);
  overflow: hidden;
}

.paper-center::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("https://image-static.collegedunia.com/public/college_data/images/campusimage/1624441644Campus%20Image.jpg")
    center / cover;
  opacity: 0.35;
  z-index: 1;
  pointer-events: none;
}

/* ===== CONTENT BOX ===== */
.paper-box {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 40px;
  text-align: center;
  color: #fff;
}

.paper-box h1 {
  font-size: 42px;
  margin-bottom: 15px;
}

.paper-box p {
  font-size: 20px;
  line-height: 1.6;
  opacity: 0.9;
}


.footer {
    background: #0066cc;
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}

.footer-col h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
}

.footer .logo {
    color: white;
    margin-bottom: 1rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content .year {
        font-size: 1.5rem;
    }

    .schedule h2,
    .welcome-text h2,
    .speakers h2,
    .tickets h2,
    .sponsors h2 {
        font-size: 1.5rem;
    }

    .features {
        grid-template-columns: 1fr;
    }
}