html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}
.slider-image {
    height: 500px;
    object-fit: cover;
    border-radius:14px;
}
.site-footer {
    background: #18202a;
    color: white;
    padding: 25px 0;
    margin-top: 40px;
}

.footer-main {
    font-size: 16px;
    font-weight: 600;
}

.footer-address {
    margin-top: 10px;
    opacity: .9;
}

.footer-contact {
    margin-top: 8px;
}

.footer-social {
    margin-top: 15px;
}

    .footer-social a {
        color: white;
        font-size: 24px;
        margin: 0 10px;
        text-decoration: none;
        transition: .3s;
    }

        .footer-social a:hover {
            opacity: .7;
        }
.countdown-box {
    background: linear-gradient(135deg,#1f4f91,#2d7be5) !important;
    color: #fff !important;
    border-radius: 14px;
    padding: 22px 25px;
    margin: 18px auto 30px auto;
    width: 100%;
    max-width: none;
    box-shadow: 0 10px 30px rgba(0,0,0,.15);
    text-align: center;
}

    .countdown-box * {
        color: #fff !important;
    }

.countdown-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 18px;
}

.countdown-items {
    display: flex;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
}

    .countdown-items div {
        background: rgba(255,255,255,.18);
        border-radius: 14px;
        min-width: 115px;
        padding: 12px 20px;
    }

    .countdown-items strong {
        display: block;
        font-size: 1.8rem;
        font-weight: 800;
    }

    .countdown-items span {
        font-size: .85rem;
    }
.sponsor-logo {
    max-height: 120px;
    transition: .3s;
}

    .sponsor-logo:hover {
        transform: scale(1.08);
    }
.sponsor-item {
    min-width: 220px;
    height: 120px;
}

    .sponsor-item img {
        max-height: 90px;
        max-width: 180px;
    }
.card-announcement,
.card-date {
    min-height: 220px;
}
@media (max-width: 576px) {
    .countdown-items {
        grid-template-columns: repeat(2, 1fr);
    }
}
.program-page {
    background: #f8f9fb;
}

.program-day-header h3 {
    color: #1f2d3d;
    border-left: 5px solid #0d6efd;
    padding-left: 12px;
}

.program-card {
    background: #ffffff;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid #e9ecef;
}

.program-time {
    background: #f1f5f9;
    display: flex;
    align-items: stretch;
    justify-content: center;
}

.time-box {
    width: 100%;
    padding: 24px 12px;
    text-align: center;
    color: #1f2d3d;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

    .time-box strong {
        font-size: 22px;
    }

    .time-box span {
        font-size: 15px;
        color: #6c757d;
    }

.program-content {
    padding: 24px;
}

.session-title {
    color: #0d6efd;
    font-size: 16px;
    font-weight: 700;
}

.paper-title {
    color: #212529;
    font-size: 21px;
    font-weight: 700;
}

.hall-badge {
    background: #0d6efd;
    color: #fff;
    padding: 7px 14px;
    border-radius: 20px;
    font-size: 14px;
    white-space: nowrap;
}

.presenter {
    color: #343a40;
}

.institution {
    font-size: 14px;
}

.description {
    color: #495057;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .program-time {
        display: block;
    }

    .time-box {
        flex-direction: row;
        gap: 10px;
        padding: 14px;
    }

    .paper-title {
        font-size: 18px;
    }

    .program-content {
        padding: 18px;
    }

    .hall-badge {
        margin-top: 10px;
    }
}