/* style.css - Design Moderno SaaS */
:root {
    --primary: #6366F1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #0EA5E9;
    --accent: #F43F5E;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --dark: #1F2937;
    --darker: #111827;
    --light: #F9FAFB;
    --lighter: #FFFFFF;
    --gray: #6B7280;
    --gray-light: #E5E7EB;
    --gray-dark: #374151;
    
    --tecnologia: #6366F1;
    --negocios: #0EA5E9;
    --design: #EC4899;
    --desenvolvimento: #10B981;
    --concursos: #F59E0B;
    --internet: #06B6D4;
    --financas: #8B5CF6;
    
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.8);
    --header-bg: rgba(255, 255, 255, 0.8);
    --footer-bg: rgba(17, 24, 39, 0.9);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --backdrop-blur: blur(10px);
    --border-radius: 12px;
    --border-radius-lg: 16px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background: linear-gradient(135deg, #f0f4ff 0%, #f8fafc 50%, #e0e7ff 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: var(--header-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    box-shadow: var(--shadow-sm);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 2rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.search-container {
    flex: 1;
    max-width: 500px;
    margin: 0 20px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box input {
    width: 100%;
    padding: 14px 20px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    font-size: 1rem;
    padding-left: 50px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    transition: all 0.3s ease;
    color: var(--dark);
}

.search-box input::placeholder {
    color: var(--gray);
}

.search-box input:focus {
    outline: none;
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--primary-light);
}

.search-box i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.9) 0%, rgba(79, 70, 229, 0.9) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    margin: 40px 0;
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    box-shadow: var(--shadow-lg);
}

.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='0.1'%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: 0.5;
}

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

.hero-content h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
    font-weight: 400;
}

/* Categories */
.categories {
    margin-bottom: 50px;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 40px;
    color: var(--dark);
    position: relative;
    padding-bottom: 15px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
}

.filter-buttons button {
    padding: 12px 24px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    color: var(--gray-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.filter-buttons button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    background: rgba(255, 255, 255, 0.8);
    color: var(--primary);
}

.filter-buttons button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* Courses Grid */
.courses-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.course-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--card-border);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.course-cover {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.course-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.course-card:hover .course-cover img {
    transform: scale(1.05);
}

.course-category {
    position: absolute;
    top: 15px;
    right: 15px;
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.tecnologia { background: var(--tecnologia); }
.negocios { background: var(--negocios); }
.design { background: var(--design); }
.desenvolvimento { background: var(--desenvolvimento); }
.concursos { background: var(--concursos); }
.internet { background: var(--internet); }
.financas { background: var(--financas); }

.course-details {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    font-size: 1.3rem;
    color: var(--dark);
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.4;
}

.course-author {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 16px;
    font-weight: 500;
}

.course-description {
    color: var(--gray-dark);
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.course-price {
    font-size: 1.4rem;
    color: var(--success);
    font-weight: 700;
}

.course-rating {
    color: var(--warning);
    font-size: 0.9rem;
}

.view-details {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    margin-top: 20px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.view-details:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Modal */
.course-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 30px;
    position: relative;
    box-shadow: var(--shadow-xl);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--card-border);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.8rem;
    color: var(--gray);
    cursor: pointer;
    transition: color 0.3s ease;
    z-index: 10;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.close-modal:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.modal-course-details {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}

.modal-course-cover {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.modal-course-cover img {
    width: 100%;
    height: auto;
    display: block;
}

.modal-course-info h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 12px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.modal-course-info .course-author {
    font-size: 1.1rem;
    margin-bottom: 24px;
    color: var(--gray);
}

.modal-course-info .course-meta {
    margin: 24px 0;
}

.full-description {
    margin-top: 24px;
    line-height: 1.8;
    color: var(--gray-dark);
}

.buy-now {
    background: var(--success);
    color: white;
    border: none;
    padding: 16px 30px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    margin-top: 24px;
    width: 100%;
    text-align: center;
    font-size: 1.1rem;
    box-shadow: var(--shadow);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.buy-now:hover {
    background: #0da271;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: white;
    padding: 50px 0 20px;
    margin-top: 80px;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: white;
    font-weight: 600;
}

.footer-section p {
    margin-bottom: 12px;
    opacity: 0.8;
    line-height: 1.6;
}

.social-icons {
    display: flex;
    gap: 16px;
}

.social-icons a {
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

.social-icons a:hover {
    color: var(--primary-light);
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 992px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .search-container {
        width: 100%;
        max-width: 100%;
    }
    
    .modal-course-details {
        grid-template-columns: 1fr;
    }
    
    .hero-content h2 {
        font-size: 2.4rem;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 60px 0;
        margin: 30px 0;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .filter-buttons {
        gap: 10px;
    }
    
    .filter-buttons button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .courses-container {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .modal-content {
        padding: 20px;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .search-box input {
        padding: 12px 16px;
        padding-left: 45px;
    }
}

/* Error and No Results */
.error-message, .no-results {
    text-align: center;
    padding: 60px 40px;
    font-size: 1.2rem;
    color: var(--gray);
    grid-column: 1 / -1;
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--border-radius);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
}

/* Loading Animation */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}