/**
 * MEDHABi LMS Platform - Modern Premium Styles
 * Bootstrap 5 + Custom CSS for Professional Educational Platform
 * 
 * This file contains all custom styles for the MEDHABi platform,
 * designed to provide a premium, modern user experience.
 */

/* ====== IMPORTS & VARIABLES ====== */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --info-color: #4299e1;
    --light-color: #f8f9fa;
    --dark-color: #2d3748;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ====== GLOBAL STYLES ====== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #ffffff;
    overflow-x: hidden;
}

/* ====== TYPOGRAPHY ====== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.display-1 { font-size: 5rem; }
.display-2 { font-size: 4.5rem; }
.display-3 { font-size: 4rem; }
.display-4 { font-size: 3.5rem; }

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    line-height: 1.6;
}

.text-highlight {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ====== NAVIGATION ====== */
.navbar {
    backdrop-filter: blur(10px);
    background: rgba(102, 126, 234, 0.95) !important;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.brand-text {
    background: linear-gradient(135deg, #ffffff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9) !important;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: var(--transition);
    margin: 0 0.25rem;
}

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

/* ====== HERO SECTION ====== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,112C1248,107,1344,117,1392,122.7L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-illustration img {
    max-width: 100%;
    height: auto;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-stats {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item {
    text-align: center;
}

.hero-buttons .btn {
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
}

.hero-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ====== FEATURE CARDS ====== */
.feature-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

/* ====== COURSE CARDS ====== */
.course-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    height: 100%;
}

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

.course-thumbnail {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.course-body {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.course-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.course-instructor {
    display: flex;
    align-items: center;
}

.instructor-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.course-rating {
    display: flex;
    align-items: center;
}

.stars {
    color: #ffc107;
    margin-right: 0.25rem;
}

/* ====== COURSE CATEGORIES ====== */
.course-categories {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.course-categories .btn {
    border-radius: 25px;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: var(--transition);
}

.course-categories .btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* ====== LEARNING PATH ====== */
.learning-path {
    position: relative;
}

.path-step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    position: relative;
}

.path-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 20px;
    top: 40px;
    width: 2px;
    height: calc(100% + 1rem);
    background: rgba(255, 255, 255, 0.3);
}

.step-number {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-right: 1rem;
    flex-shrink: 0;
}

.step-content h5 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.step-content p {
    margin-bottom: 0;
    opacity: 0.9;
}

/* ====== TESTIMONIALS ====== */
.testimonial-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.testimonial-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.testimonial-author {
    display: flex;
    align-items: center;
    margin-top: 1rem;
}

.testimonial-author img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

/* ====== GRADIENT BACKGROUNDS ====== */
.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.bg-gradient-secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
}

/* ====== BUTTONS ====== */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: left 0.3s ease;
}

.btn:hover::before {
    left: 0;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* ====== FORMS ====== */
.form-control {
    border-radius: 8px;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.input-group-text {
    background: var(--light-color);
    border: 2px solid var(--border-color);
    border-right: none;
}

/* ====== ALERTS ====== */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}

.alert-success {
    background: linear-gradient(135deg, rgba(72, 187, 120, 0.1), rgba(72, 187, 120, 0.05));
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.1), rgba(237, 137, 54, 0.05));
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(245, 101, 101, 0.1), rgba(245, 101, 101, 0.05));
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background: linear-gradient(135deg, rgba(66, 153, 225, 0.1), rgba(66, 153, 225, 0.05));
    color: var(--info-color);
    border-left: 4px solid var(--info-color);
}

/* ====== MODALS ====== */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
}

/* ====== LOADING STATES ====== */
.spinner-border {
    border-color: var(--primary-color);
    border-right-color: transparent;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ====== FOOTER ====== */
footer {
    background: var(--dark-color);
}

.social-links a {
    font-size: 1.25rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color) !important;
    transform: translateY(-2px);
}

/* ====== RESPONSIVE DESIGN ====== */
@media (max-width: 768px) {
    .hero-section {
        text-align: center;
        padding: 2rem 0;
    }
    
    .hero-buttons {
        text-align: center;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .course-categories {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }
    
    .path-step {
        flex-direction: column;
        text-align: center;
    }
    
    .path-step:not(:last-child)::after {
        display: none;
    }
    
    .step-number {
        margin: 0 auto 1rem;
    }
    
    .testimonial-author {
        flex-direction: column;
        text-align: center;
    }
    
    .testimonial-author img {
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 576px) {
    .display-3 {
        font-size: 2.5rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .hero-stats .row > div {
        margin-bottom: 1rem;
    }
}

/* ====== UTILITIES ====== */
.cursor-pointer {
    cursor: pointer;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.transition-all {
    transition: var(--transition);
}

/* ====== ANIMATIONS ====== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

/* ====== ACCESSIBILITY ====== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for accessibility */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ====== PRINT STYLES ====== */
@media print {
    .navbar,
    .hero-buttons,
    footer {
        display: none !important;
    }
    
    .hero-section {
        background: white !important;
        color: black !important;
    }
    
    .text-white {
        color: black !important;
    }
}