/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    height: 70px;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.logo i {
    font-size: 1.8rem;
}

.search-bar {
    display: flex;
    align-items: center;
    background: #f8f9fa;
    border-radius: 25px;
    padding: 0.5rem 1rem;
    flex: 1;
    max-width: 400px;
    margin: 0 2rem;
}

.search-bar input {
    border: none;
    background: none;
    outline: none;
    flex: 1;
    padding: 0.5rem;
    font-size: 0.9rem;
}

.search-btn {
    background: none;
    border: none;
    color: #667eea;
    cursor: pointer;
    padding: 0.5rem;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.notification-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #333;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    position: relative;
}

.notification-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #ff4757;
    color: white;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 50%;
    min-width: 20px;
    text-align: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 10px;
    transition: background 0.3s ease;
}

.user-profile:hover {
    background: #f8f9fa;
}

.profile-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    color: #333;
    font-size: 0.9rem;
}

.user-level {
    font-size: 0.8rem;
    color: #667eea;
    font-weight: 500;
}

/* Main Content */
.main-content {
    display: flex;
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: white;
    border-right: 1px solid #e9ecef;
    padding: 2rem 0;
    position: fixed;
    left: 0;
    top: 70px;
    height: calc(100vh - 70px);
    overflow-y: auto;
}

.sidebar-nav {
    padding: 0 1.5rem;
}

.nav-section {
    margin-bottom: 2rem;
}

.nav-section h3 {
    font-size: 0.8rem;
    font-weight: 600;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.nav-section ul {
    list-style: none;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 0.3rem;
}

.nav-item:hover {
    background: #f8f9fa;
    color: #667eea;
}

.nav-item.active {
    background: #667eea;
    color: white;
}

.nav-item i {
    font-size: 1.1rem;
    width: 20px;
}

/* Content Area */
.content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* Welcome Section */
.welcome-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 2rem;
}

.welcome-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.welcome-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.progress-overview {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.progress-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.progress-circle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-fill {
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset 0.5s ease;
}

.progress-text {
    position: absolute;
    font-size: 1.2rem;
    font-weight: 700;
}

.progress-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.stats-overview {
    display: flex;
    gap: 2rem;
}

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

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.9;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
}

.view-all-btn {
    background: none;
    border: 2px solid #667eea;
    color: #667eea;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.view-all-btn:hover {
    background: #667eea;
    color: white;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.course-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.course-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    position: relative;
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.course-content {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.course-instructor {
    color: #6c757d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: #ffc107;
}

.course-actions {
    display: flex;
    gap: 0.5rem;
}

.course-btn {
    flex: 1;
    padding: 0.7rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.course-btn.primary {
    background: #667eea;
    color: white;
}

.course-btn.secondary {
    background: #f8f9fa;
    color: #333;
}

.course-btn:hover {
    transform: translateY(-2px);
}

/* Activity List */
.activity-list {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid #e9ecef;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #667eea;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 500;
    color: #333;
    margin-bottom: 0.2rem;
}

.activity-time {
    font-size: 0.8rem;
    color: #6c757d;
}

/* Courses Filters */
.courses-filters {
    display: flex;
    gap: 1rem;
}

.courses-filters select {
    padding: 0.5rem 1rem;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
}

/* Progress Section */
.progress-overview-large {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.progress-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.progress-circle-large {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 1rem 0;
}

/* Back to Portfolio */
.back-to-portfolio {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    text-decoration: none;
    padding: 0.8rem 1.2rem;
    border-radius: 25px;
    font-weight: 500;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        padding: 0 1rem;
    }
    
    .search-bar {
        display: none;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .content {
        margin-left: 0;
        padding: 1rem;
    }
    
    .progress-overview {
        flex-direction: column;
        gap: 1rem;
    }
    
    .stats-overview {
        gap: 1rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-portfolio {
        top: 10px;
        right: 10px;
    }
    
    .back-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .welcome-content h1 {
        font-size: 1.5rem;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .courses-filters {
        flex-direction: column;
    }
    
    .progress-overview-large {
        grid-template-columns: 1fr;
    }
}