/* ==========================================================================
   bayarea.ai - Modern Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #0f2444;
    --color-accent: #d69e2e;
    --color-accent-light: #f6e05e;
    --color-accent-dark: #b7791f;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Semantic colors */
    --color-text: var(--color-gray-700);
    --color-text-light: var(--color-gray-500);
    --color-text-muted: var(--color-gray-400);
    --color-bg: var(--color-white);
    --color-bg-alt: var(--color-gray-50);
    --color-border: var(--color-gray-200);
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;
    
    /* Font sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
    --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px var(--color-shadow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 72px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-gray-900);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin-bottom: var(--space-4);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
    background: var(--color-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo-container {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
}

.logo {
    font-family: var(--font-serif);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--color-primary-light);
}

.tagline {
    font-size: var(--text-sm);
    color: var(--color-accent);
    font-weight: 500;
}

/* Desktop Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-8);
}

.main-nav a {
    font-weight: 500;
    color: var(--color-gray-700);
    padding: var(--space-2) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1002;
    flex-shrink: 0;
}

.hamburger {
    position: relative;
    width: 22px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-base);
    border-radius: 2px;
    display: block;
}

.hamburger::before,
.hamburger::after {
    content: "";
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-base);
    border-radius: 2px;
    display: block;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* Hamburger to X animation */
.mobile-menu-toggle.active .hamburger {
    background: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .header-content {
        position: relative;
    }

    .mobile-menu-toggle {
        display: flex;
        margin-left: auto;
    }

    .tagline {
        display: none;
    }
    
    .main-nav {
        position: absolute;
        top: var(--header-height);
        right: 0;
        background: var(--color-white);
        width: 280px;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        z-index: 1001;
    }
    
    .main-nav.active {
        max-height: 400px;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
        padding: var(--space-4) 0;
    }
    
    .main-nav a {
        display: block;
        padding: var(--space-3) var(--space-6);
        border-bottom: 1px solid var(--color-gray-100);
    }
    
    .main-nav a:last-child {
        border-bottom: none;
    }
    
    .main-nav a:hover,
    .main-nav a.active {
        background-color: var(--color-gray-50);
    }
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--space-20) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.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='0.05'%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 .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
    color: var(--color-white);
    margin-bottom: var(--space-6);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: var(--text-lg);
    max-width: 650px;
    margin: 0 auto var(--space-8);
    opacity: 0.95;
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-primary);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--text-base);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
    padding: var(--space-16) 0;
}

.section:nth-child(even) {
    background: var(--color-bg-alt);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-12);
    color: var(--color-primary);
    position: relative;
    padding-bottom: var(--space-4);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   Featured Grid - Balanced Layout
   -------------------------------------------------------------------------- */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.featured-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-decoration: none;
    display: block;
}

.featured-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.featured-image {
    width: 100%;
    height: 280px;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
    display: block;
}

.featured-card:hover .featured-image {
    transform: scale(1.05);
}

.featured-content {
    padding: var(--space-6);
}

.featured-content h3,
.featured-content h4 {
    margin-bottom: var(--space-3);
    font-size: var(--text-lg);
    line-height: 1.4;
}

.featured-content h3 a,
.featured-content h4 a {
    color: var(--color-gray-900);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.featured-content h3 a:hover,
.featured-content h4 a:hover {
    color: var(--color-primary);
}

.featured-content p {
    color: var(--color-gray-600);
    font-size: var(--text-sm);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

.category-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: var(--color-primary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-3);
}

.meta-info {
    display: flex;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

/* --------------------------------------------------------------------------
   City Grid
   -------------------------------------------------------------------------- */
.city-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.city-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-decoration: none;
    display: block;
}

.city-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.city-image-container {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.city-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.city-card:hover .city-image {
    transform: scale(1.08);
}

.city-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.4) 60%, transparent 100%);
    color: var(--color-white);
    padding: var(--space-6) var(--space-4) var(--space-4);
}

.city-overlay h3 {
    color: var(--color-white);
    margin-bottom: var(--space-2);
    font-size: var(--text-xl);
}

.city-overlay p {
    color: var(--color-gray-300);
    font-size: var(--text-sm);
    margin: 0;
}

/* City card content variant (for homepage economic drivers) */
.city-card-content {
    padding: var(--space-6);
    text-align: center;
}

.city-card-content h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.city-card-content p {
    color: var(--color-gray-600);
    font-size: var(--text-sm);
    margin: 0;
}

.city-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    object-position: center;
}

/* --------------------------------------------------------------------------
   Page Content
   -------------------------------------------------------------------------- */
.page-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-12) 0;
}

/* Article Header */
.article-header {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 2px solid var(--color-gray-200);
}

.article-header h1 {
    margin-bottom: var(--space-3);
}

.article-description {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
    line-height: 1.7;
    margin: 0;
}

/* Section Page Header */
.section-page-header {
    text-align: center;
    margin-bottom: var(--space-12);
    padding-bottom: var(--space-8);
    border-bottom: 2px solid var(--color-gray-200);
}

.section-page-header .section-title {
    margin-bottom: var(--space-4);
    padding-bottom: 0;
}

.section-page-header .section-title::after {
    display: none;
}

.section-description {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

.content {
    line-height: 1.8;
}

.content h2 {
    margin-top: var(--space-12);
    margin-bottom: var(--space-4);
    color: var(--color-primary);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--color-gray-200);
}

.content h3 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-3);
    color: var(--color-primary-light);
}

.content p {
    margin-bottom: var(--space-5);
}

.content ul, 
.content ol {
    margin: var(--space-6) 0;
    padding-left: var(--space-6);
}

.content li {
    margin-bottom: var(--space-2);
}

.content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

.content strong {
    color: var(--color-gray-900);
    font-weight: 600;
}

/* Featured image on single pages */
.featured-image-container {
    text-align: center;
    margin: var(--space-8) 0;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.featured-image-container .featured-image {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: cover;
}

/* --------------------------------------------------------------------------
   Image Gallery
   -------------------------------------------------------------------------- */
.city-gallery {
    margin: var(--space-12) 0;
}

.city-gallery h2 {
    text-align: center;
    margin-bottom: var(--space-8);
}

.city-image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

.gallery-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    object-position: center;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.gallery-image:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--space-12) 0 var(--space-6);
    margin-top: var(--space-20);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section h3 {
    color: var(--color-white);
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
}

.footer-section h4 {
    color: var(--color-accent);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-4);
}

.footer-section p {
    color: var(--color-gray-400);
    font-size: var(--text-sm);
    line-height: 1.8;
    margin-bottom: var(--space-3);
}

.footer-section a {
    color: var(--color-gray-400);
}

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

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a {
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-gray-800);
    color: var(--color-gray-500);
    font-size: var(--text-sm);
}

.footer-bottom p {
    margin-bottom: var(--space-2);
}

.footer-bottom a {
    color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }
    
    h1 { font-size: var(--text-3xl); }
    h2 { font-size: var(--text-2xl); }
    h3 { font-size: var(--text-xl); }
    
    .hero {
        padding: var(--space-12) 0;
    }
    
    .hero h1 {
        font-size: var(--text-2xl);
    }
    
    .hero p {
        font-size: var(--text-base);
    }
    
    .section {
        padding: var(--space-10) 0;
    }
    
    .featured-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .featured-image {
        height: 220px;
    }
    
    .city-grid {
        grid-template-columns: 1fr;
    }
    
    .city-image-container {
        height: 200px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .page-content {
        padding: var(--space-8) 0;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: var(--text-xl);
    }
    
    .hero {
        padding: var(--space-10) 0;
    }
    
    .hero h1 {
        font-size: var(--text-xl);
    }
    
    .cta-button {
        padding: var(--space-3) var(--space-6);
        font-size: var(--text-sm);
    }
    
    .featured-image {
        height: 180px;
    }
    
    .featured-content {
        padding: var(--space-4);
    }
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-gray-500); }
.hidden { display: none; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Animation utilities */
.fade-in {
    animation: fadeIn var(--transition-base) ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Print styles */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-toggle {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    a {
        text-decoration: underline;
    }
}