:root {
    --primary-color: #d97706;
    --secondary-color: #f59e0b;
    --accent-color: #fbbf24;
    --dark-primary: #92400e;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #fffbeb;
    --gradient: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
}

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

html,
body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
}

.navbar {
    background: linear-gradient(135deg, #92400e 0%, #d97706 100%) !important;
    box-shadow: 0 10px 30px rgba(146, 64, 14, 0.2);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: white !important;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.navbar-toggler {
    border: none;
    color: white;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='m4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.dropdown-menu {
    background: white;
    border: none;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 0.5rem 0;
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.hero {
    background: var(--gradient);
    color: white;
    padding: 8rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero .lead {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.profile-img {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 8px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    object-fit: cover;
}

.slider-section {
    padding: 4rem 0;
    background: white;
}

.slider-container {
    position: relative;
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.slider-wrapper {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.slide {
    min-width: 100%;
    position: relative;
}

.slide img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
}

.slide-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 3rem 2rem 2rem;
}

.slide-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.slide-description {
    font-size: 1rem;
    opacity: 0.9;
}

.slider-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.slider-nav:hover {
    background: white;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    transform: translateY(-50%) scale(1.1);
}

.slider-nav.prev {
    left: 20px;
}

.slider-nav.next {
    right: 20px;
}

.slider-nav i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 2rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(217, 119, 6, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--primary-color);
    transform: scale(1.2);
}

.content-section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    overflow: hidden;
    margin-bottom: 2rem;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.card-body {
    padding: 2rem;
}

.research-item {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.research-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.research-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.publication-item {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-color);
    transition: all 0.3s ease;
}

.publication-item:hover {
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.publication-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.publication-meta {
    color: var(--text-light);
    font-size: 0.9rem;
}

.contact-info {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: var(--secondary-color);
    color: white;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-right: 1rem;
}

.footer {
    background: linear-gradient(135deg, #92400e 0%, #d97706 100%);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: auto;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: white;
}

.about-section {
    display: none;
}

.about-section.active {
    display: block;
}

.nav-pills .nav-link.active {
    background-color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .hero h1 {
        font-size: 3rem;
    }
    .slider-nav {
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 992px) {
    .hero {
        padding: 6rem 0 3rem;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    .profile-img {
        width: 250px;
        height: 250px;
        margin-top: 2rem;
    }
    .slide img {
        height: 350px;
    }
    .slider-nav {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
        text-align: center;
    }
    .hero .lead {
        font-size: 1.1rem;
        text-align: center;
    }
    .profile-img {
        width: 200px;
        height: 200px;
    }
    .content-section {
        padding: 3rem 0;
    }
    .section-title {
        font-size: 2rem;
    }
    .slide img {
        height: 280px;
    }
    .slider-nav {
        width: 35px;
        height: 35px;
    }
    .contact-item {
        flex-direction: column;
        text-align: center;
    }
    .contact-icon {
        margin-right: 0;
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 5rem 0 2rem;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .profile-img {
        width: 180px;
        height: 180px;
    }
    .slide img {
        height: 220px;
    }
    .slider-nav {
        width: 30px;
        height: 30px;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .research-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}