/* Custom CSS for Seth Walker's Personal Website */

/* Root Variables */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --info-color: #0dcaf0;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Global Styles */
html, body {
    height: 100%;
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #ffffff;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Main content wrapper */
main {
    flex: 1;
}

/* Ensure footer stays at bottom */
footer {
    background-color: var(--dark-color) !important;
    color: white !important;
    position: relative;
    z-index: 10;
    margin-top: auto;
}

/* Typography */
.section-title {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 3rem;
}

.lead {
    font-weight: 400;
    color: #6c757d;
}

/* Navigation */
.navbar {
    transition: all 0.3s ease;
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    transition: color 0.3s ease;
    margin: 0 0.5rem;
}

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

/* Hero Section */
.hero-section {
    background: #ffffff;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding-top: 80px;
    color: var(--dark-color);
    min-height: 100vh;
    opacity: 1 !important;
    transform: none !important;
}

/* Page Header (for other pages) */
.page-header {
    background: #ffffff;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: var(--dark-color);
    opacity: 1 !important;
    transform: none !important;
}

.page-header h1,
.page-header h2,
.page-header h3,
.page-header h4,
.page-header h5,
.page-header h6 {
    color: var(--dark-color);
}

.page-header p {
    color: var(--dark-color);
}

.page-header .lead {
    color: #6c757d;
}

.hero-section h1,
.hero-section h2,
.hero-section h3,
.hero-section h4,
.hero-section h5,
.hero-section h6 {
    color: var(--dark-color);
}

.hero-section p {
    color: var(--dark-color);
}

.hero-section .lead {
    color: #6c757d;
}

.hero-section .text-primary {
    color: var(--primary-color) !important;
}

.hero-content h1 {
    font-weight: 700;
    line-height: 1.2;
}

.hero-buttons .btn {
    padding: 0.75rem 2rem;
    font-weight: 500;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.hero-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}
  
.profile-placeholder {
    background: white;
    border-radius: 50%;
    width: auto;
    height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Expertise Cards */
.expertise-card {
    background: white;
    border-radius: 15px;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.expertise-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.expertise-icon {
    color: var(--primary-color);
}

/* Cards */
.card {
    transition: all 0.3s ease;
    border-radius: 15px;
    background-color: #e9ecef;
    border: 1px solid #e9ecef;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1) !important;
}

/* Contact Section */
#contact {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0056b3 100%);
}

.contact-links .btn {
    border-radius: 50px;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.contact-links .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3);
}

footer p {
    color: white !important;
}

/* Project Cards */
.project-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.project-image {
    height: 200px;
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
}

.project-content {
    padding: 1.5rem;
}

.project-tags {
    margin-bottom: 1rem;
}

.project-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.card-body{
    background-color: #e9ecef;
    border-radius: 15px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .profile-placeholder {
        width: 250px;
        height: 250px;
        margin-top: 2rem;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .contact-links .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .profile-placeholder {
        width: 200px;
        height: 200px;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
.fade-in {
    opacity: 1;
    transform: translateY(30px);
    transition: all 0.5s ease;
}

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

/* Custom Button Styles */
.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #0056b3;
    border-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

.btn-outline-primary {
    border-color: var(--primary-color);
    color: var(--primary-color);
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    margin-top: auto;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

/* Research Statistics */
.stat-item {
    background: white;
    border-radius: 15px;
    padding: 2rem 1rem;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
    height: 90%;
    width: 100%;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    color: var(--primary-color);
}

.stat-number {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-weight: 500;
    color: #6c757d;
}

/* Citation Popup Styles */
.citation-text {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    resize: none;
}

.citation-text:focus {
    background-color: #ffffff;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.citation-formats .btn-check:checked + .btn {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.cite-btn {
    cursor: pointer;
    transition: all 0.3s ease;
}

.cite-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Page Transitions */
.page-transition {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.page-transition.loaded {
    opacity: 1;
    transform: translateY(0);
}