* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --secondary: #00cec9;
    --accent: #fd79a8;
    --dark: #2d3436;
    --light: #dfe6e9;
    --white: #ffffff;
    --gray: #636e72;
    --success: #00b894;
    --danger: #d63031;
    --warning: #fdcb6e;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 25px rgba(0,0,0,0.15);
    --radius: 10px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: var(--light);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    color: var(--primary);
    font-size: 1.8rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 25px;
}

.nav-link {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 15px;
    border-radius: var(--radius);
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(108, 92, 231, 0.1);
}

.btn-primary {
    background: var(--primary);
    color: var(--white) !important;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.admin-link {
    color: var(--warning);
}

/* Main */
.main {
    margin-top: 80px;
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.2) 0%, rgba(0, 206, 201, 0.2) 100%);
    border-radius: var(--radius);
    margin-bottom: 50px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
}

/* Grid de Modelos */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.model-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.model-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.model-thumbnail {
    width: 100%;
    height: 200px;
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.model-thumbnail .placeholder {
    font-size: 4rem;
    color: var(--gray);
}

.model-info {
    padding: 20px;
}

.model-info h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--white);
}

.model-info .category {
    font-size: 0.85rem;
    color: var(--secondary);
    margin-bottom: 10px;
}

.model-info .price {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--success);
}

.model-info .price.free {
    color: var(--secondary);
}

.model-actions {
    padding: 15px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    gap: 10px;
}

.btn-view, .btn-download {
    flex: 1;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-view:hover {
    background: var(--primary-dark);
}

.btn-download {
    background: transparent;
    border: 1px solid var(--secondary);
    color: var(--secondary);
}

.btn-download:hover {
    background: var(--secondary);
    color: var(--dark);
}

/* Model Viewer */
.model-viewer-container {
    background: var(--dark);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 30px;
}

#model-viewer {
    width: 100%;
    height: 500px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
}

.viewer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
}

.viewer-controls button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background: var(--primary);
    color: var(--white);
    cursor: pointer;
    transition: var(--transition);
}

.viewer-controls button:hover {
    background: var(--primary-dark);
}

/* Model Details */
.model-details {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 40px;
}

.model-description h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--white);
}

.model-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray);
}

.meta-item i {
    color: var(--primary);
}

/* Sidebar */
.model-sidebar {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-price {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--success);
    margin-bottom: 20px;
    text-align: center;
}

.sidebar-price.free {
    color: var(--secondary);
}

.sidebar-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 15px;
}

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

.sidebar-btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.sidebar-btn-secondary {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
}

.sidebar-btn-secondary:hover {
    background: var(--secondary);
    color: var(--dark);
}

/* Admin Dashboard */
.admin-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
    min-height: calc(100vh - 80px);
}

.admin-sidebar {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-menu {
    list-style: none;
}

.admin-menu li {
    margin-bottom: 10px;
}

.admin-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    color: var(--light);
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
}

.admin-menu a:hover, .admin-menu a.active {
    background: var(--primary);
    color: var(--white);
}

.admin-content {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.admin-header h1 {
    font-size: 1.8rem;
    color: var(--white);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: rgba(108, 92, 231, 0.2);
    padding: 25px;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid rgba(108, 92, 231, 0.3);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.stat-card h3 {
    font-size: 2rem;
    color: var(--white);
    margin-bottom: 5px;
}

.stat-card p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.data-table th {
    background: rgba(108, 92, 231, 0.3);
    color: var(--white);
    font-weight: 600;
}

.data-table tr:hover {
    background: rgba(255, 255, 255, 0.05);
}

.data-table td {
    color: var(--light);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--light);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: rgba(0, 184, 148, 0.2);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(214, 48, 49, 0.2);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.alert-warning {
    background: rgba(253, 203, 110, 0.2);
    border: 1px solid var(--warning);
    color: var(--warning);
}

/* Buttons */
.btn-add {
    background: var(--success);
    color: var(--white);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-add:hover {
    background: #00a884;
}

.btn-edit {
    background: var(--warning);
    color: var(--dark);
    padding: 5px 10px;
}

.btn-delete {
    background: var(--danger);
    color: var(--white);
    padding: 5px 10px;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 50px 0 20px;
    margin-top: 50px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3, .footer-section h4 {
    color: var(--white);
    margin-bottom: 20px;
}

.footer-section p {
    color: var(--gray);
    line-height: 1.6;
}

.footer-section a {
    display: block;
    color: var(--gray);
    text-decoration: none;
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray);
}

/* Mobile Responsive */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(26, 26, 46, 0.98);
        flex-direction: column;
        padding: 20px;
        display: none;
    }
    
    .nav.active {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .model-details {
        grid-template-columns: 1fr;
    }
    
    .admin-layout {
        grid-template-columns: 1fr;
    }
    
    .admin-sidebar {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Spinner */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(108, 92, 231, 0.3);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--dark);
    padding: 30px;
    border-radius: var(--radius);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    color: var(--white);
}

.modal-close {
    background: none;
    border: none;
    color: var(--gray);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-close:hover {
    color: var(--white);
}