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

:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-hover: #5855eb;
    --primary-light: #e0e7ff;
    --secondary-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1400px;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition-base: all 0.2s ease-in-out;
}

body {
    font-family: var(--font-family-primary);
    background-color: var(--gray-50);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 16px;
}

/* === Header === */
.browse-header {
    background: var(--white);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.logo-text {
    font-family: var(--font-family-heading);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.main-nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatars {
    display: flex;
    gap: var(--spacing-xs);
}

.avatar-small {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--gray-300);
    border: 2px solid var(--white);
}

.help-text {
    color: var(--text-secondary);
    font-size: 14px;
}

.upgrade-btn {
    background: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--white);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

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

/* === Main Content === */
.browse-main {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* === Sub Navigation === */
.sub-nav {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-light);
}

.sub-nav-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    padding: var(--spacing-md) 0;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-base);
}

.sub-nav-btn:hover,
.sub-nav-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* === Sections === */
.collections-section,
.criteria-section {
    margin-bottom: var(--spacing-4xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.nav-arrows {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-arrow {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-base);
    font-size: 18px;
    color: var(--text-secondary);
}

.nav-arrow:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

/* === Collections Grid === */
.collections-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-lg);
}

.collection-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-md);
}

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

.collection-card.locked {
    background: var(--gray-100);
    cursor: not-allowed;
}

.collection-card.locked:hover {
    transform: none;
    box-shadow: none;
}

.collection-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
    margin: 0 auto;
}

.collection-card.locked .collection-icon {
    color: var(--gray-400);
}

.lock-icon {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 12px;
}

.collection-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.collection-card.locked h3 {
    color: var(--gray-500);
}

.upgrade-text {
    font-size: 12px;
    color: var(--primary-color);
    margin: 0;
}

/* === Criteria Actions === */
.criteria-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.criteria-btn {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.criteria-btn:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.criteria-btn svg {
    width: 16px;
    height: 16px;
}

/* === Listings Grid === */
.listings-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.listing-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.listing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

.listing-type {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.type-icon {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    flex-shrink: 0;
}

.type-icon.saas {
    background: var(--primary-color);
}

.type-icon.digital {
    background: var(--success-color);
}

.type-icon svg {
    width: 12px;
    height: 12px;
}

.listing-type span {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.listing-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    background: none;
    border: none;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-base);
    color: var(--text-muted);
    border-radius: 4px;
}

.action-btn:hover {
    background: var(--gray-100);
    color: var(--text-secondary);
}

.action-btn.favorite:hover {
    color: var(--error-color);
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

.listing-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
    margin: 0;
    flex-grow: 1;
}

.listing-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

.metric {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.metric-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* === Load More === */
.load-more {
    display: flex;
    justify-content: center;
    padding-top: var(--spacing-xl);
}

/* === Chat Widget === */
.chat-widget {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1000;
}

.chat-button {
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.chat-button:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.chat-button svg {
    width: 24px;
    height: 24px;
    color: var(--white);
}

/* === Responsive Design === */
@media (max-width: 1200px) {
    .listings-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .collections-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 1024px) {
    .header-container {
        padding: var(--spacing-md);
    }
    
    .browse-main {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .listings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .collections-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .main-nav {
        gap: var(--spacing-lg);
    }
    
    .header-actions {
        gap: var(--spacing-sm);
    }
    
    .help-text {
        display: none;
    }
}

@media (max-width: 768px) {
    .listings-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .collections-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .criteria-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .main-nav {
        display: none;
    }
    
    .listing-metrics {
        grid-template-columns: 1fr;
    }
    
    .chat-widget {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .collections-grid {
        grid-template-columns: 1fr;
    }
    
    .collection-card {
        padding: var(--spacing-md);
    }
    
    .listing-card {
        padding: var(--spacing-md);
    }
    
    .browse-main {
        padding: var(--spacing-md);
    }
    
    .header-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}