/* ==================== VARIÁVEIS CSS ==================== */
:root {
    /* Cores principais */
    --primary: #007bff;
    --primary-dark: #0056b3;
    --secondary: #6c757d;
    --success: #28a745;
    --info: #17a2b8;
    --warning: #ffc107;
    --danger: #dc3545;
    --light: #f8f9fa;
    --dark: #343a40;
    --white: #ffffff;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warning: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-info: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Bordas */
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    
    /* Fontes */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 1rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Espaçamentos */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;
    
    /* Transições */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --transition-slow: all 0.5s ease;
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* ==================== LAYOUT ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col, .col-12, .col-md-6, .col-lg-4, .col-lg-8, .col-lg-3 {
    padding: 0 15px;
}

.col-12 { flex: 0 0 100%; }
.col-md-6 { flex: 0 0 50%; }
.col-lg-3 { flex: 0 0 25%; }
.col-lg-4 { flex: 0 0 33.333333%; }
.col-lg-8 { flex: 0 0 66.666667%; }

@media (max-width: 768px) {
    .col-md-6, .col-lg-3, .col-lg-4, .col-lg-8 {
        flex: 0 0 100%;
    }
}

/* ==================== NAVBAR ==================== */
.navbar {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: #007bff;
    text-decoration: none;
}

.nav-link {
    color: #333;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: #f8f9fa;
    color: #007bff;
}

/* ==================== HERO SECTION ==================== */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8rem 0 4rem;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.hero-stat {
    text-align: center;
    padding: 1rem;
}

.hero-stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

.hero-stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
}

/* ==================== CARDS ==================== */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* ==================== DEMOS GRID ==================== */
.demos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.demo-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.demo-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.demo-preview {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: #f8f9fa;
}

.demo-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.demo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #6c757d;
    font-size: 3rem;
}

.demo-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.demo-card:hover .demo-overlay {
    opacity: 1;
}

.demo-info {
    padding: 1.5rem;
}

.demo-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: white;
    margin-bottom: 1rem;
}

.demo-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.demo-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

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

.price-tag {
    font-size: 1.5rem;
    font-weight: 700;
    color: #28a745;
}

.btn-edit-price {
    background: none;
    border: none;
    color: #6c757d;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.btn-edit-price:hover {
    color: #007bff;
    background: #f8f9fa;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #1e7e34;
    color: white;
}

.btn-outline-primary {
    border: 1px solid #007bff;
    color: #007bff;
    background: transparent;
}

.btn-outline-primary:hover {
    background: #007bff;
    color: white;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

/* ==================== FILTERS ==================== */
.filters-section {
    padding: 2rem 0;
    background: white;
    border-bottom: 1px solid #e9ecef;
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #e9ecef;
    background: white;
    color: #333;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.875rem;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: #007bff;
    background: #007bff;
    color: white;
}

.search-container {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 2px solid #e9ecef;
    border-radius: 25px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #007bff;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
}

/* ==================== UTILITIES ==================== */
.text-center { text-align: center; }
.text-muted { color: #6c757d; }
.text-primary { color: #007bff; }
.text-success { color: #28a745; }
.text-danger { color: #dc3545; }

.bg-light { background-color: #f8f9fa; }
.bg-white { background-color: white; }
.bg-primary { background-color: #007bff; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.py-5 { padding: 3rem 0; }
.p-4 { padding: 1.5rem; }

.d-flex { display: flex; }
.d-grid { display: grid; }
.d-block { display: block; }
.d-none { display: none; }

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

.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

.fw-bold { font-weight: 700; }

/* ==================== ALERTS ==================== */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-warning {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-danger {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .hero-section {
        padding: 6rem 0 3rem;
    }
    
    .demos-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .category-filters {
        justify-content: center;
    }
    
    .filter-btn {
        font-size: 0.8rem;
        padding: 0.375rem 0.75rem;
    }
}

/* ==================== DARK MODE SUPPORT ==================== */
@media (prefers-color-scheme: dark) {
    :root {
        --light: #1a1a1a;
        --dark: #ffffff;
    }
    
    body {
        background: #1a1a1a;
        color: #ffffff;
    }
    
    .demo-card {
        background: #2d2d2d;
        border: 1px solid #3d3d3d;
    }
    
    .navbar {
        background: rgba(0, 0, 0, 0.95) !important;
    }
    
    .modal-content {
        background: #2d2d2d;
        color: #ffffff;
    }
}