/* ============================================
   BLDR Help Center - Modern Light Theme CSS
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-subtle: #eff6ff;
    
    --secondary: #0891b2;
    --accent: #f59e0b;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Category Colors */
    --overview-bg: #dbeafe;
    --overview-color: #1e40af;
    --forms-bg: #d1fae5;
    --forms-color: #065f46;
    --admin-bg: #fef3c7;
    --admin-color: #92400e;
    --faq-bg: #fce7f3;
    --faq-color: #9d174d;
    --usecases-bg: #e0e7ff;
    --usecases-color: #3730a3;
    --security-bg: #ccfbf1;
    --security-color: #0f766e;
    
    /* Typography */
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* Spacing */
    --container-max: 1200px;
    --container-padding: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    z-index: 1000;
    text-decoration: none;
    font-weight: 500;
    border-radius: 0 0 var(--radius-md) 0;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 1rem var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.logo-text {
    letter-spacing: -0.02em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--primary-subtle) 100%);
    padding: 4rem var(--container-padding);
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(8, 145, 178, 0.08) 0%, transparent 50%),
        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='%232563eb' fill-opacity='0.03'%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");
    pointer-events: none;
}

.hero-content {
    position: relative;
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Search */
.search-container {
    max-width: 600px;
    margin: 0 auto;
}

.search-wrapper {
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 1rem 1.25rem 1rem 3.25rem;
    font-size: 1rem;
    font-family: inherit;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-results {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 50;
}

.search-results.active {
    display: block;
}

.search-result-item {
    display: block;
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    transition: background-color var(--transition-fast);
}

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

.search-result-item:hover {
    background: var(--bg-secondary);
}

.search-result-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.search-result-category {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.search-no-results {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    flex: 1;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 3rem var(--container-padding);
    width: 100%;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.category-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

.category-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.category-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
}

.category-icon.overview {
    background: var(--overview-bg);
    color: var(--overview-color);
}

.category-icon.forms {
    background: var(--forms-bg);
    color: var(--forms-color);
}

.category-icon.admin {
    background: var(--admin-bg);
    color: var(--admin-color);
}

.category-icon.faq {
    background: var(--faq-bg);
    color: var(--faq-color);
}

.category-icon.usecases {
    background: var(--usecases-bg);
    color: var(--usecases-color);
}

.category-icon.security {
    background: var(--security-bg);
    color: var(--security-color);
}

.category-content {
    flex: 1;
    min-width: 0;
}

.category-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.category-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.category-count {
    font-size: 0.8125rem;
    color: var(--text-muted);
    font-weight: 500;
}

.category-arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.category-card:hover .category-arrow {
    transform: translateX(4px);
    color: var(--primary);
}

/* Quick Links Section */
.quick-links {
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    padding: 2.5rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.quick-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.quick-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.quick-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

.quick-link svg {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.quick-link:hover svg {
    color: var(--primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    margin-top: auto;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 3rem var(--container-padding);
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    padding: 0.375rem 0;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-light);
    padding: 1.5rem var(--container-padding);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   Category Page Styles
   ============================================ */
.page-header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--primary-subtle) 100%);
    padding: 3rem var(--container-padding);
}

.page-header-content {
    max-width: var(--container-max);
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.breadcrumb-separator {
    color: var(--text-muted);
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
}

.page-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.page-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Articles List */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
}

.article-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.article-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-subtle);
    color: var(--primary);
    border-radius: var(--radius-md);
}

.article-content {
    flex: 1;
    min-width: 0;
}

.article-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.article-excerpt {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.article-item:hover .article-arrow {
    transform: translateX(4px);
    color: var(--primary);
}

/* ============================================
   Article Page Styles
   ============================================ */
.article-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem var(--container-padding) 4rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.article-body {
    font-size: 1.0625rem;
    line-height: 1.75;
}

.article-body h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body ul,
.article-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
}

.article-body pre {
    background: var(--bg-tertiary);
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin-bottom: 1.25rem;
}

.article-body pre code {
    background: none;
    padding: 0;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    margin: 1.5rem 0;
}

.article-body blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.article-body a {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-color: rgba(37, 99, 235, 0.3);
    transition: text-decoration-color var(--transition-fast);
}

.article-body a:hover {
    text-decoration-color: var(--primary);
}

/* Callout boxes */
.callout {
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-lg);
    margin: 1.5rem 0;
}

.callout-info {
    background: var(--primary-subtle);
    border-left: 4px solid var(--primary);
}

.callout-warning {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
}

.callout-success {
    background: #d1fae5;
    border-left: 4px solid #10b981;
}

.callout-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Article Navigation */
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-light);
}

.article-nav-link {
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.article-nav-link:hover {
    background: var(--bg-tertiary);
}

.article-nav-link.next {
    text-align: right;
}

.article-nav-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.article-nav-title {
    font-weight: 600;
    color: var(--primary);
}

/* Helpful Article Section */
.article-feedback {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    text-align: center;
}

.article-feedback h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feedback-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.feedback-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.feedback-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.feedback-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 768px) {
    .header-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 3rem var(--container-padding);
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-card {
        padding: 1.25rem;
    }
    
    .quick-links {
        padding: 1.5rem;
    }
    
    .quick-links-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .article-nav {
        grid-template-columns: 1fr;
    }
    
    .article-nav-link.next {
        text-align: left;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .feedback-buttons {
        flex-direction: column;
    }
    
    .feedback-btn {
        justify-content: center;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card,
.article-item,
.quick-link {
    animation: fadeIn 0.4s ease backwards;
}

.categories-grid .category-card:nth-child(1) { animation-delay: 0.05s; }
.categories-grid .category-card:nth-child(2) { animation-delay: 0.1s; }
.categories-grid .category-card:nth-child(3) { animation-delay: 0.15s; }
.categories-grid .category-card:nth-child(4) { animation-delay: 0.2s; }
.categories-grid .category-card:nth-child(5) { animation-delay: 0.25s; }
.categories-grid .category-card:nth-child(6) { animation-delay: 0.3s; }

.articles-list .article-item:nth-child(1) { animation-delay: 0.05s; }
.articles-list .article-item:nth-child(2) { animation-delay: 0.1s; }
.articles-list .article-item:nth-child(3) { animation-delay: 0.15s; }
.articles-list .article-item:nth-child(4) { animation-delay: 0.2s; }
.articles-list .article-item:nth-child(5) { animation-delay: 0.25s; }
.articles-list .article-item:nth-child(6) { animation-delay: 0.3s; }
.articles-list .article-item:nth-child(7) { animation-delay: 0.35s; }
.articles-list .article-item:nth-child(8) { animation-delay: 0.4s; }
.articles-list .article-item:nth-child(9) { animation-delay: 0.45s; }
.articles-list .article-item:nth-child(10) { animation-delay: 0.5s; }

/* Print styles */
@media print {
    .header,
    .footer,
    .search-container,
    .article-feedback,
    .article-nav {
        display: none;
    }
    
    .article-body {
        font-size: 12pt;
    }
}