body { font-family: 'Open Sans', sans-serif; }
h1, h2, h3, h4, h5, h6 { font-family: 'Poppins', sans-serif; font-weight: 700; }

.nav-item { position: relative; }
.nav-item::after {
    content: ''; position: absolute; width: 0; height: 2px; bottom: -4px; left: 0;
    background-color: #00629B; transition: width 0.3s;
}
.nav-item:hover::after { width: 100%; }

.fade-in { animation: fadeIn 1s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.card-hover { transition: transform 0.3s, box-shadow 0.3s; }
.card-hover:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(0, 40, 85, 0.2); }

.btn-primary {
    background: #00629B; color: white; padding: 12px 30px; border-radius: 6px;
    font-weight: 600; transition: all 0.3s; display: inline-block;
}
.btn-primary:hover { background: #002855; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0, 40, 85, 0.3); }

.btn-secondary {
    background: transparent; border: 2px solid white; color: white; padding: 12px 30px;
    border-radius: 6px; font-weight: 600; transition: all 0.3s; display: inline-block;
}
.btn-secondary:hover { background: white; color: #00629B; }

.section-title {
    font-size: 2.5rem; font-weight: 800; color: #002855;
    margin-bottom: 40px; position: relative; padding-bottom: 20px;
    border-bottom: 4px solid #00629B; display: inline-block;
}

.countdown-timer {
    display: flex; gap: 20px; justify-content: center; flex-wrap: wrap;
}

.countdown-item {
    display: flex; flex-direction: column; align-items: center;
    background: rgba(0, 98, 155, 0.9); padding: 20px 30px; border-radius: 8px;
}

.countdown-item .value {
    font-size: 3rem; font-weight: bold; color: white;
}

.countdown-item .label {
    font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px;
}

.sponsor-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.sponsor-logo {
    background: white; border: 1px solid #ddd; padding: 20px;
    border-radius: 8px; display: flex; align-items: center; justify-content: center;
    min-height: 120px; transition: all 0.3s;
}

.sponsor-logo:hover { box-shadow: 0 8px 20px rgba(0, 40, 85, 0.15); }

table { width: 100%; border-collapse: collapse; background: white; }
table th { background: #002855; color: white; padding: 15px; text-align: left; font-weight: 600; }
table td { padding: 12px 15px; border-bottom: 1px solid #ddd; }
table tr:hover { background: #f5f5f5; }

.speaker-card { transition: transform 0.3s, box-shadow 0.3s; }
.speaker-card:hover { transform: translateY(-8px); box-shadow: 0 12px 35px rgba(0, 40, 85, 0.2); }

.download-card { transition: transform 0.3s, box-shadow 0.3s; }
.download-card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(0, 40, 85, 0.15); }

.day-tab { padding: 10px 20px; cursor: pointer; border-bottom: 3px solid transparent; transition: all 0.3s; }
.day-tab.active { border-bottom-color: #00629B; background: #F8F9FA; }

.faq-item { cursor: pointer; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-answer { display: none; transition: all 0.3s ease; }
.faq-icon { transition: transform 0.3s ease; }

.header-banner {
    background-image: url('../../images/nit-delhi-building.png');
}

.hover-elevate { transition: all 0.3s ease; }
.hover-elevate:hover { transform: translateY(-4px); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1); }