/* 
 * Custom Brand Theme and Stylesheet
 * Lecture Notes Management Portal
 */

/* Google Fonts - Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Light Mode Brand Colors */
    --primary-color: #1e3a8a;       /* Deep Navy */
    --primary-hover: #172554;
    --secondary-color: #3b82f6;     /* Bright Blue Accents */
    --accent-color: #06b6d4;        /* Cyan Highlight */
    
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(226, 232, 240, 0.8);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.1);
}

/* Dark Mode Constants */
[data-bs-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary-color: #60a5fa;
    --accent-color: #22d3ee;
    
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #020617 100%);
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --input-bg: #1e293b;
    --input-border: #475569;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
}

body {
    font-family: var(--font-primary);
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Glassmorphism Wrapper for Premium Feel */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(16px) saturate(120%);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease, border 0.3s ease;
    overflow: hidden;
    max-width: 100%;
}

.glass-panel:hover {
    box-shadow: var(--shadow-lg);
}

/* Custom Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Dynamic Navbar Design */
.navbar-custom {
    background: rgba(30, 41, 59, 0.8) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0.8rem 1.5rem;
}

.navbar-custom .navbar-brand {
    font-weight: 800;
    letter-spacing: -0.03em;
    color: #ffffff;
    display: flex;
    align-items: center;
}

.navbar-custom .nav-link {
    color: #cbd5e1;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    margin: 0 0.1rem;
}

.navbar-custom .nav-link:hover, 
.navbar-custom .nav-link.active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

/* Dashboard Stat Cards */
.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
}

/* Interactive Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
}

/* Forms Style Updates */
.form-control, .form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-primary);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus, .form-select:focus {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.2);
}

/* Striped Responsive Table Customizations */
.table-responsive {
    border-radius: 12px;
    overflow-x: auto;
    border: 1px solid var(--card-border);
}

.custom-table {
    margin-bottom: 0;
    background: var(--card-bg);
}

.custom-table th {
    background-color: rgba(30, 41, 59, 0.9);
    color: #ffffff;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem 1.25rem;
    border: none;
}

.custom-table td {
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    vertical-align: middle;
    border-bottom: 1px solid var(--card-border);
}

.custom-table tbody tr:hover {
    background-color: rgba(59, 130, 246, 0.05);
}

/* Custom Micro-animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Card hover animation */
.card-hover-effect {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-hover-effect:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Profile Badge Styling */
.badge-role {
    font-weight: 600;
    letter-spacing: 0.02em;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
}

/* Custom Pagination styles */
.pagination {
    margin-bottom: 0;
}

.page-link {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.page-link:hover {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
}

.page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Drag & Drop Upload Container styling */
.upload-container {
    border: 2px dashed var(--input-border);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    background: rgba(59, 130, 246, 0.02);
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-container:hover {
    border-color: var(--secondary-color);
    background: rgba(59, 130, 246, 0.05);
}

/* Footer styling */
.footer-custom {
    padding: 1.5rem 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--card-border);
    font-size: 0.85rem;
    margin-top: auto;
}