:root {
    --primary-color: #1a237e;
    --secondary-color: #3949ab;
    --accent-color: #00acc1;
    --light-color: #f5f7fa;
    --dark-color: #263238;
    --success-color: #00c853;
    --text-color: #455a64;
    --sidebar-bg: #171b26;
    --sidebar-border: #232537;
    --sidebar-text: #ccd6f6;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    --gradient-primary: linear-gradient(135deg, #1a237e 0%, #3949ab 100%);
    --gradient-accent: linear-gradient(135deg, #00acc1 0%, #0097a7 100%);
    --gradient-success: linear-gradient(135deg, #00c853 0%, #00a040 100%);
    --gradient-hero: linear-gradient(135deg, rgba(26, 35, 126, 0.9) 0%, rgba(57, 73, 171, 0.8) 100%);
}

body {
  display: flex;
  min-height: 100vh;
  background-color: var(--warm-white);
  color: #333;
}

.main-content {
    flex: 1;
    padding: 30px;
    margin-left: 280px;
    transition: margin-left 0.3s ease;
}

.container {
    margin: 0 auto;
}

/* header section */
header {
    text-align: center;
    margin-bottom: 35px;
    padding: 14px 16px;
    background: #2d3748;
    border-radius: 12px;
    color: white;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

header::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -10%;
    width: 250px;
    height: 250px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}




/* Hero Section */
.hero {
    min-height: 15vh;
    display: flex;
    align-items: center;
    position: relative;
    background: url('https://picsum.photos/seed/publications/1920/1080.jpg') center/cover;
    margin-bottom: 28px;
    overflow: hidden;
    border-radius: 12px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px 20px;
    text-align: center;
}

.hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    color: white;
    margin-left: 98px;
    font-weight: 700;
    line-height: 1.2;
    animation: fadeInUp 1s ease-out;
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.floating-element {
    position: absolute;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.floating-element:nth-child(1) {
    top: 20%;
    left: 10%;
    font-size: 3rem;
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    top: 60%;
    right: 10%;
    font-size: 2.5rem;
    animation-delay: 2s;
}

.floating-element:nth-child(3) {
    bottom: 20%;
    left: 20%;
    font-size: 2rem;
    animation-delay: 4s;
}

/* Section Styles */
.section {
    position: relative;
}

/* Publications Section */
.publications-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.publication-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    position: relative;
}

.publication-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--hover-shadow);
}

.pub-icon {
    flex: 0 0 120px;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.pub-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.pub-content {
    flex: 1;
    padding: 30px;
}

.pub-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    color: #2d3748;
    margin-bottom: 10px;
    font-weight: 600;
    line-height: 1.3;
}

.pub-status {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.status-review {
    background: rgba(255, 152, 0, 0.1);
    color: #ff9800;
    border: 1px solid #ff9800;
}

.status-published {
    background: rgba(0, 200, 83, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.pub-authors {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 15px;
}

.pub-authors strong {
    color: var(--dark-color);
}

.pub-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    color: #6c757d;
}

.pub-meta-item {
    display: flex;
    align-items: center;
}

.pub-meta-item i {
    margin-right: 8px;
    color: var(--accent-color);
}

.pub-abstract {
    font-size: 1rem;
    line-height: 1.7;
    text-align: justify;
    color: var(--text-color);
    margin-bottom: 20px;
}

.pub-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.pub-keyword {
    background: rgba(0, 172, 193, 0.1);
    color: var(--accent-color);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.pub-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pub-link-primary {
    background-color: #2d3748;
    color: white;
    box-shadow: 0 2px 4px rgba(26, 35, 126, 0.3);
}

.pub-link-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(26, 35, 126, 0.4);
}

.pub-link-secondary {
    background: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.pub-link-secondary:hover {
    background: #2d3748;
    color: white;
}

.pub-link i {
    margin-left: 6px;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

/* Responsive Styles */
@media (max-width: 955px) {
    .main-content {
        margin-left: 0;
    }

    .hero h1 {
        font-size: 1.5rem;
        margin-left: 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .publication-card {
        flex-direction: column;
    }

    .pub-icon {
        flex: 0 0 auto;
        width: 100%;
        height: 80px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    header {
        padding: 30px 15px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

}

@media (max-width: 400px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    header {
        padding: 20px 0;
        margin-bottom: 30px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .pub-title {
        font-size: 1.2rem;
    }

    .pub-meta {
        flex-direction: column;
        gap: 10px;
    }

    .pub-actions {
        flex-direction: column;
    }
}