/* ========================================
   German Robotics University - Main Styles
   Version: 1.0
   ======================================== */

:root {
    --primary-blue: #003366;
    --secondary-blue: #004080;
    --accent-silver: #C0C0C0;
    --light-bg: #f8f9fa;
    --dark-bg: #1a1a1a;
    --gradient-primary: linear-gradient(135deg, #003366 0%, #004080 100%);
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-md: 0 5px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 15px 40px rgba(0,51,102,0.15);
    --transition: all 0.3s ease;
}

* {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    overflow-x: hidden;
    background-color: #ffffff;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 15px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    padding: 10px 0;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-blue) !important;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
}

.navbar-brand i {
    margin-right: 10px;
    font-size: 1.75rem;
}

.nav-link {
    color: var(--primary-blue) !important;
    font-weight: 500;
    margin: 0 10px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--secondary-blue) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: 10px;
    padding: 10px 0;
}

.dropdown-item {
    padding: 10px 20px;
    color: var(--primary-blue);
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--light-bg);
    color: var(--primary-blue);
    padding-left: 25px;
}

/* ========================================
   Hero Sections
   ======================================== */
.faculty-hero, .page-hero {
    background: linear-gradient(135deg, rgba(0,51,102,0.95) 0%, rgba(0,64,128,0.9) 100%);
    background-size: cover;
    background-position: center;
    color: white;
    padding: 140px 0 100px;
    position: relative;
    overflow: hidden;
}

.faculty-hero::before, .page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
}

.hero-badge {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50px;
    padding: 8px 20px;
    display: inline-block;
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

/* Home Hero */
.home-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(0,51,102,0.97) 0%, rgba(0,64,128,0.95) 100%),
                url('../images/campus-bg.jpg');
    background-size: cover;
    background-position: center;
    padding-top: 80px;
}

.home-hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.1;
}

.home-hero-subtitle {
    font-size: 1.5rem;
    opacity: 0.95;
    margin-bottom: 40px;
    max-width: 700px;
}

/* ========================================
   Cards
   ======================================== */
.feature-card {
    background: white;
    border: none;
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.program-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    height: 100%;
}

.program-card:hover {
    border-color: var(--primary-blue);
    transform: translateY(-5px);
}

.program-header {
    background: var(--gradient-primary);
    color: white;
    padding: 25px;
}

.program-body {
    padding: 30px;
}

.faculty-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
    border: 2px solid transparent;
}

.faculty-card:hover {
    border-color: var(--primary-blue);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.faculty-card-header {
    background: var(--gradient-primary);
    color: white;
    padding: 25px;
    text-align: center;
}

.faculty-card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.faculty-card-body {
    padding: 25px;
}

.faculty-card-body ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.faculty-card-body li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    font-size: 0.95rem;
    color: #555;
}

.faculty-card-body li::before {
    content: '\F26B';
    font-family: 'Bootstrap Icons';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* AI Card */
.ai-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
}

.ai-card:hover {
    background: var(--primary-blue);
    color: white;
}

.ai-card:hover .ai-icon {
    background: white;
    color: var(--primary-blue);
}

.ai-icon {
    width: 70px;
    height: 70px;
    background: rgba(0,51,102,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: var(--primary-blue);
    transition: var(--transition);
}

/* News Card */
.news-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
}

.news-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.news-card-body {
    padding: 25px;
}

.news-badge {
    background: var(--primary-blue);
    color: white;
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.8rem;
    display: inline-block;
    margin-bottom: 15px;
}

.news-date {
    color: #888;
    font-size: 0.9rem;
    margin-top: 15px;
}

/* Facility Item */
.facility-item {
    background: white;
    padding: 20px 30px;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.facility-item:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateX(10px);
}

.facility-item i {
    font-size: 1.5rem;
    margin-right: 15px;
    color: var(--primary-blue);
}

.facility-item:hover i {
    color: white;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.section-subtitle {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 50px;
}

.bg-light-custom {
    background: var(--light-bg);
}

/* ========================================
   Buttons
   ======================================== */
.btn-custom {
    background: white;
    color: var(--primary-blue);
    padding: 15px 40px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    border: 2px solid white;
}

.btn-custom:hover {
    background: transparent;
    color: white;
    transform: translateY(-3px);
}

.btn-custom-primary {
    background: var(--primary-blue);
    color: white;
    padding: 15px 40px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    border: 2px solid var(--primary-blue);
}

.btn-custom-primary:hover {
    background: transparent;
    color: var(--primary-blue);
    transform: translateY(-3px);
}

.btn-outline-custom {
    background: transparent;
    color: white;
    padding: 15px 40px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    border: 2px solid white;
    margin-left: 15px;
}

.btn-outline-custom:hover {
    background: white;
    color: var(--primary-blue);
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: var(--gradient-primary);
    color: white;
    padding: 100px 0;
    text-align: center;
}

/* ========================================
   Footer
   ======================================== */
footer {
    background: var(--dark-bg);
    color: white;
    padding: 60px 0 30px;
}

.footer-link {
    color: #aaa;
    text-decoration: none;
    transition: var(--transition);
}

.footer-link:hover {
    color: white;
}

.footer-social a {
    color: white;
    font-size: 1.25rem;
    margin-right: 15px;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--accent-silver);
    transform: translateY(-3px);
    display: inline-block;
}

/* ========================================
   Stats Counter
   ======================================== */
.stat-item {
    text-align: center;
    padding: 30px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.stat-label {
    color: #666;
    font-size: 1rem;
}

/* ========================================
   Feature List
   ======================================== */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    list-style: none;
}

.feature-list li::before {
    content: '\F26B';
    font-family: 'Bootstrap Icons';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .hero-title, .home-hero-title {
        font-size: 2rem;
    }
    
    .home-hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .btn-outline-custom {
        margin-left: 0;
        margin-top: 15px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-primary-custom {
    color: var(--primary-blue) !important;
}

.bg-primary-custom {
    background-color: var(--primary-blue) !important;
}

.rounded-custom {
    border-radius: 15px !important;
}

.shadow-custom {
    box-shadow: var(--shadow-md) !important;
}