/* ===== Base & Typography ===== */
body {
    font-family: 'Inter', 'Noto Sans', sans-serif;
}

.publication-title {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
}

.publication-authors {
    font-family: 'Inter', sans-serif;
}

.publication-authors a {
    color: hsl(204, 86%, 53%) !important;
}

.publication-authors a:hover {
    text-decoration: underline;
}

.author-block {
    display: inline-block;
}

/* ===== Content Width ===== */
.container.is-max-desktop {
    max-width: 960px !important;
}

.container.is-max-widescreen {
    max-width: 1200px !important;
}

/* ===== Hero ===== */
.hero.is-light {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
}

.hero.is-light .hero-body {
    padding-bottom: 2rem;
}

.link-block a {
    margin: 5px 20px;
    min-width: 110px;
    box-shadow: 0 0 5px rgba(126, 138, 138, 0.3);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.link-block a:hover {
    box-shadow: 0 2px 10px rgba(126, 138, 138, 0.5);
    transform: translateY(-1px);
    filter: brightness(1.1);
}

.btn-arxiv {
    background-color: #c85454 !important;
    border-color: #c85454 !important;
    color: #fff !important;
}

.btn-github {
    background-color: #5b5f67 !important;
    border-color: #5b5f67 !important;
    color: #fff !important;
}

.btn-model {
    background-color: #ffb740 !important;
    border-color: #ffb740 !important;
    color: #fff !important;
}

.btn-data {
    background-color: #78b0e0 !important;
    border-color: #78b0e0 !important;
    color: #fff !important;
}

/* ===== Dataset Table ===== */
.dataset-table {
    font-size: 0.92rem;
}

.dataset-table thead th {
    background: #f0f4f8;
    color: #363636;
    font-weight: 600;
    border-bottom: 2px solid #dbdbdb;
}

.dataset-table .dataset-subtotal td {
    background: #f9fbfd;
    font-style: italic;
}

.dataset-table tfoot td {
    background: #f0f4f8;
    font-weight: 600;
    border-top: 2px solid #dbdbdb;
}

/* ===== Demo Section ===== */
.demo-section {
    background-color: #fafafa;
}

.demo-section hr {
    background-color: #e0e0e0;
    height: 1px;
}

/* ===== Video Cards ===== */
.video-card {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    border: 1px solid #eee;
}

.video-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-3px);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background: #1a1a2e;
    overflow: hidden;
}

.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #fff;
}

.video-wrapper-wide {
    padding-bottom: 50%;
}

.video-wrapper-tall {
    padding-bottom: 112.5%;
}

.video-wrapper-tall video {
    object-fit: cover;
}

.video-card .card-content {
    padding: 0.75rem 1rem;
}

/* ===== Video Play Overlay ===== */
.video-play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.25);
    transition: background 0.3s ease;
}

.video-play-overlay:hover {
    background: rgba(0, 0, 0, 0.35);
}

.video-play-overlay .play-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease, background 0.2s ease;
}

.video-play-overlay:hover .play-btn {
    transform: scale(1.1);
    background: #fff;
}

.video-play-overlay .play-btn i {
    font-size: 22px;
    color: #363636;
    margin-left: 3px; /* optical center for play triangle */
}

.video-play-overlay.is-hidden {
    display: none;
}

/* ===== Video Placeholder ===== */
.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: rgba(255, 255, 255, 0.5);
    z-index: 1;
}

.video-placeholder .icon {
    margin-bottom: 0.5rem;
}

.video-placeholder p {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.video-wrapper.video-loaded .video-placeholder {
    display: none;
}

/* ===== Video Controls ===== */
.video-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}

.video-controls .button {
    border: none;
    background: #f0f0f0;
    transition: background-color 0.2s ease;
}

.video-controls .button:hover {
    background: #e0e0e0;
}

.video-progress {
    flex-grow: 1;
}

.video-progress input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: #ddd;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.video-progress input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: hsl(204, 86%, 53%);
    cursor: pointer;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
}

.video-progress input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: hsl(204, 86%, 53%);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
}

/* ===== BibTeX ===== */
.bibtex-container pre {
    background: #f5f5f5;
    border-radius: 10px;
    padding: 1.25rem;
    border: 1px solid #e0e0e0;
    font-size: 0.85rem;
    overflow-x: auto;
}

/* ===== Footer ===== */
.footer .icon-link {
    font-size: 25px;
    color: #000;
}

/* ===== Responsive ===== */
@media screen and (max-width: 768px) {
    .demo-tabs a span:last-child {
        font-size: 0.9rem;
    }

    .video-card:hover {
        transform: none;
    }

    .video-controls {
        flex-wrap: wrap;
    }
}

@media screen and (max-width: 480px) {
    .video-card .card-content {
        padding: 0.5rem 0.75rem;
    }
}