:root {
    --bg: #f6f4f0;
    --bg-2: #f0f6ff;
    --ink: #1f1f1f;
    --muted: #5f6b7a;
    --accent: #ff5a3d;
    --accent-2: #1b6fff;
    --card: #ffffff;
    --ring: rgba(27, 111, 255, 0.25);
    --shadow: 0 18px 40px rgba(20, 26, 35, 0.12);
}

body.page {
    font-family: "Noto Sans KR", "Space Grotesk", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(1200px 600px at 10% -10%, #ffe9e1 0%, transparent 60%),
        radial-gradient(900px 500px at 90% 10%, #e3f0ff 0%, transparent 55%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
    min-height: 100vh;
}

.hero {
    padding: 56px 0 28px;
    background: linear-gradient(135deg, #111111 0%, #2a2a2a 55%, #1b6fff 140%);
    color: #ffffff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-inner {
    max-width: 860px;
}

.hero-kicker {
    display: inline-block;
    font-family: "Space Grotesk", "Noto Sans KR", sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
    margin-top: 16px;
    font-family: "Space Grotesk", "Noto Sans KR", sans-serif;
    font-weight: 700;
    font-size: clamp(28px, 4vw, 44px);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    margin-top: 10px;
    font-size: clamp(14px, 2.2vw, 18px);
    color: rgba(255, 255, 255, 0.8);
}

.filter-bar {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 10;
}

.navbar-brand {
    font-weight: 700;
    color: var(--ink);
}

.navbar .nav-link {
    color: var(--muted);
    font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
    color: var(--accent-2);
}

main.container {
    padding: 24px 0 60px;
}

#video-list .card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    border: 1px solid rgba(0, 0, 0, 0.05);
    background: var(--card);
    box-shadow: 0 6px 18px rgba(20, 26, 35, 0.08);
    border-radius: 16px;
    overflow: hidden;
}

#video-list .card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.card-img-top {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background-color: #e9ecef;
}

.card-title {
    font-weight: 700;
    font-size: 16px;
    line-height: 1.3;
}

.card-text {
    color: var(--muted);
}

.card-link:focus-visible {
    outline: 3px solid var(--ring);
    border-radius: 16px;
}

.dropdown-menu {
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
}

@media (max-width: 575px) {
    .hero {
        padding: 44px 0 24px;
    }

    .hero-subtitle {
        font-size: 14px;
    }
}