:root {
    --bg-color: #05070a;
    --card-bg: rgba(20, 25, 35, 0.7);
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --accent-color: #a855f7;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, .subtitle {
    font-family: 'Outfit', sans-serif;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    text-align: center;
    background: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
}

.title {
    font-size: 4.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.authors {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--text-secondary);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
}

/* Teaser Figure */
.figure-container {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.teaser-img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.caption {
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Abstract */
.abstract-card {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    font-weight: 300;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.abstract-card p {
    margin-bottom: 1.5rem;
}

.abstract-card p:last-child {
    margin-bottom: 0;
}

.abstract-card strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.video-placeholder {
    aspect-ratio: 16/9;
    background: linear-gradient(45deg, #1e293b, #0f172a);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: transform 0.3s ease;
}

.video-placeholder:hover {
    transform: scale(1.02);
}

.placeholder-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,0.4);
    transition: background 0.3s ease;
}

.video-placeholder:hover .placeholder-overlay {
    background: rgba(0,0,0,0.2);
}

.placeholder-overlay span {
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.placeholder-overlay small {
    color: var(--text-secondary);
}

/* BibTeX */
.bibtex-container {
    position: relative;
    background: #000;
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.bibtex-container pre {
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: #a5b4fc;
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background 0.3s;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* Footer */
.footer {
    padding: 4rem 0;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .title { font-size: 3rem; }
    .subtitle { font-size: 1.1rem; }
    .section { padding: 4rem 0; }
    .abstract-card { padding: 1.5rem; }
}