:root {
    --primary-red: #dc2626;
    --dark-red: #b91c1c;
    --black: #000000;
    --dark-gray: #1f2937;
    --light-gray: #f8fafc;
    --white: #ffffff;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--black) 0%, var(--dark-gray) 100%);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%23dc2626" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23dc2626" opacity="0.1"/><circle cx="50" cy="10" r="1" fill="%23dc2626" opacity="0.1"/><circle cx="10" cy="90" r="1" fill="%23dc2626" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.header-content {
    position: relative;
    z-index: 1;
}

.title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--white) 0%, var(--primary-red) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 30px;
    opacity: 0.9;
}

.authors {
    font-size: 1.1rem;
    margin-bottom: 40px;
    opacity: 0.8;
}

.author-link {
    color: var(--primary-red);
    text-decoration: none;
    transition: color 0.3s ease;
}

.author-link:hover {
    color: var(--white);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-red);
    color: var(--white);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
    background: var(--dark-red);
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(220, 38, 38, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--primary-red);
}

.btn-secondary:hover {
    background: var(--primary-red);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--black);
    transform: translateY(-2px);
}

/* Content Sections */
.section {
    padding: 80px 0;
}

.section:nth-child(even) {
    background: var(--light-gray);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--black);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-red);
    border-radius: 2px;
}

/* Abstract */
.abstract {
    max-width: 1600px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
    text-align: justify;
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-left: 5px solid var(--primary-red);
}

/* Gallery */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.gallery-item {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-5px);
}

.media-container {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.media-content {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.gallery-item:hover .media-content {
    transform: scale(1.05);
}

.gallery-item-content {
    padding: 20px;
}

.gallery-item h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--black);
}

.gallery-item p {
    color: var(--dark-gray);
    font-size: 0.95rem;
}

/* Citation */
.citation {
    background: var(--black);
    color: var(--white);
    padding: 40px;
    border-radius: 15px;
    margin: 40px 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    position: relative;
    overflow: hidden;
}

.citation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-red), var(--dark-red));
}

.citation-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-red);
    font-family: 'Inter', sans-serif;
}

/* Footer */
.footer {
    background: var(--black);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer p {
    margin-bottom: 20px;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 30px;
}

.footer-links a {
    color: var(--white);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-red);
}

/* Responsive */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }

    .action-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .section-title {
        font-size: 2rem;
    }

    .abstract {
        padding: 30px 20px;
    }

    .gallery {
        grid-template-columns: 1fr;
    }

    .media-container {
        height: 200px;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section > * {
    animation-delay: 0.2s;
}

.section > *:nth-child(2) {
    animation-delay: 0.4s;
}

.section > *:nth-child(3) {
    animation-delay: 0.6s;
}

/* Ripple animation */
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}