html, body {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", sans-serif;
    color: #1f2937;
}

.navbar {
    background: rgba(15, 118, 110, 0.96);
}

.navbar .nav-link {
    color: #e5f6f4;
    font-weight: 500;
}

.navbar .nav-link.active,
.navbar .nav-link:hover {
    color: #fff;
}

.hero-wrapper {
    margin-top: 72px;
}

.hero-slide,
.hero-fallback {
    min-height: 70vh;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 720px;
}

.hero-kicker {
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 700;
    opacity: 0.9;
}

.section-block {
    padding: 72px 0;
}

.section-title {
    position: relative;
    margin-bottom: 12px;
    font-weight: 700;
}

.section-title::after {
    content: "";
    display: block;
    margin-top: 8px;
    width: 56px;
    height: 3px;
    background: var(--primary-color);
}

.about-side-card {
    background: #f8fafc;
}

.speaker-card img,
.speaker-placeholder {
    height: 230px;
    object-fit: cover;
}

.speaker-placeholder {
    background: #dbeafe;
    font-size: 48px;
    color: #1d4ed8;
}

.schedule-item {
    padding: 12px 0;
    border-bottom: 1px dashed #d1d5db;
}

.schedule-item:last-child {
    border-bottom: none;
}

.countdown-block {
    background: linear-gradient(120deg, var(--primary-color), #0a4b49);
}

.countdown-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    max-width: 620px;
    margin: 0 auto;
}

.countdown-card {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 16px;
}

.countdown-card span {
    display: block;
    font-size: 32px;
    font-weight: 700;
}

footer {
    background: #111827;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    filter: brightness(0.92);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}