/* ==========================================================================
   Front Range Air Pro - Main Stylesheet
   Colorado Springs HVAC Resource Blog
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Variables)
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #1e3a5f;
    --color-primary-dark: #152a45;
    --color-primary-light: #2a4d7a;
    --color-secondary: #e85a2c;
    --color-secondary-dark: #c94a20;
    --color-secondary-light: #f06a3c;
    --color-accent: #2ecc71;
    --color-accent-dark: #27ae60;
    --color-background: #f8f9fa;
    --color-white: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-muted: #888888;
    --color-border: #e0e0e0;
    --color-border-light: #f0f0f0;

    /* Typography */
    --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 18px;
    --font-size-small: 0.875rem;
    --font-size-xs: 0.75rem;
    --line-height-base: 1.7;
    --line-height-heading: 1.3;

    /* 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;

    /* Layout */
    --max-width-site: 1200px;
    --max-width-content: 750px;
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.875rem;
    margin-top: var(--spacing-2xl);
}

h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-xl);
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-lg);
}

ul, ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

li {
    margin-bottom: var(--spacing-sm);
}

strong {
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   Layout Containers
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--max-width-site);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

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

.site-logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.site-logo-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--color-white);
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.site-title span {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.main-nav a {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-sm) 0;
    position: relative;
}

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

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

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

.nav-cta {
    background: var(--color-secondary);
    color: var(--color-white) !important;
    padding: var(--spacing-sm) var(--spacing-lg) !important;
    border-radius: var(--border-radius);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    background: var(--color-secondary-dark);
    color: var(--color-white) !important;
    transform: translateY(-1px);
}

/* Mobile Navigation */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    margin: 5px 0;
    transition: var(--transition-fast);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.hero h1 {
    color: var(--color-white);
    font-size: 2.75rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.hero-accent {
    color: var(--color-secondary-light);
}

/* --------------------------------------------------------------------------
   Blog Card Grid
   -------------------------------------------------------------------------- */
.blog-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.blog-section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: var(--max-width-site);
    margin: 0 auto;
}

.blog-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.blog-card-image {
    position: relative;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
}

.blog-card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.blog-card-content {
    padding: var(--spacing-lg);
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.blog-card-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.blog-card-date svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.blog-card-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
    line-height: 1.4;
}

.blog-card-title a {
    color: var(--color-primary);
}

.blog-card-title a:hover {
    color: var(--color-secondary);
}

.blog-card-excerpt {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.blog-card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-heading);
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.blog-card-link svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
    transition: transform var(--transition-fast);
}

.blog-card-link:hover svg {
    transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Single Post Layout
   -------------------------------------------------------------------------- */
.post-header {
    background: var(--color-white);
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--color-border-light);
}

.post-header .container-narrow {
    max-width: 900px;
}

.post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.post-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-meta-item svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.post-title {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-lg);
    margin-top: 0;
}

.post-featured-image {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin-top: calc(-1 * var(--spacing-xl));
    position: relative;
    z-index: 10;
}

.post-featured-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Post Content */
.post-content {
    background: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.post-content .container-narrow {
    max-width: var(--max-width-content);
}

.post-content h2 {
    color: var(--color-primary);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.post-content h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.post-content h3 {
    color: var(--color-primary-light);
}

.post-content a {
    color: var(--color-secondary);
    text-decoration: underline;
    text-decoration-color: rgba(232, 90, 44, 0.3);
    text-underline-offset: 2px;
}

.post-content a:hover {
    text-decoration-color: var(--color-secondary);
}

.post-content ul,
.post-content ol {
    margin-left: var(--spacing-lg);
}

.post-content blockquote {
    border-left: 4px solid var(--color-secondary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   CTA Box
   -------------------------------------------------------------------------- */
.cta-box {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-2xl) 0;
    text-align: center;
}

.cta-box h3 {
    color: var(--color-white);
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    transition: background var(--transition-fast), transform var(--transition-fast);
    text-decoration: none !important;
}

.cta-button:hover {
    background: var(--color-secondary-dark);
    color: var(--color-white);
    transform: translateY(-2px);
}

.cta-button svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* --------------------------------------------------------------------------
   Author Box
   -------------------------------------------------------------------------- */
.author-box {
    display: flex;
    gap: var(--spacing-lg);
    background: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-2xl) 0;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.author-avatar svg {
    width: 40px;
    height: 40px;
    fill: var(--color-white);
}

.author-info h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.author-title {
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.author-bio {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Related Posts
   -------------------------------------------------------------------------- */
.related-posts {
    background: var(--color-background);
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.related-posts h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: var(--spacing-2xl);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: var(--max-width-site);
    margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Back to Blog Link
   -------------------------------------------------------------------------- */
.back-to-blog {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--color-white);
    border-top: 1px solid var(--color-border-light);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-primary);
}

.back-link svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    transition: transform var(--transition-fast);
}

.back-link:hover svg {
    transform: translateX(-4px);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.footer-inner {
    max-width: var(--max-width-site);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

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

.footer-brand .site-logo-icon {
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.1);
}

.footer-brand .site-logo-icon svg {
    width: 18px;
    height: 18px;
}

.footer-text {
    font-size: var(--font-size-small);
    opacity: 0.8;
}

.footer-text p {
    margin-bottom: var(--spacing-xs);
}

.footer-text a {
    color: var(--color-secondary-light);
}

.footer-text a:hover {
    color: var(--color-white);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-small);
}

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

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.about-hero h1 {
    color: var(--color-white);
}

.about-content {
    background: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.about-content .container-narrow {
    max-width: 800px;
}

.service-areas {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-xl) 0;
}

.service-areas h3 {
    margin-top: 0;
}

.service-areas ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.service-areas li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-secondary);
    border-radius: 50%;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-xl); }
.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-xl); }

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

@media (max-width: 768px) {
    :root {
        --font-size-base: 16px;
    }

    .header-inner {
        padding: var(--spacing-md);
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        gap: var(--spacing-md);
    }

    .main-nav.active {
        display: flex;
    }

    .mobile-nav-toggle {
        display: block;
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .blog-grid,
    .related-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .post-title {
        font-size: 1.75rem;
    }

    .post-meta {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .author-box {
        flex-direction: column;
        text-align: center;
    }

    .author-avatar {
        margin: 0 auto;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .service-areas ul {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .blog-card-content {
        padding: var(--spacing-md);
    }

    .cta-box {
        padding: var(--spacing-lg);
    }

    .post-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .site-header,
    .site-footer,
    .cta-box,
    .related-posts,
    .back-to-blog {
        display: none;
    }

    .post-content {
        padding: 0;
    }

    body {
        background: white;
        color: black;
    }
}