/* ============================================================
   ObviousPDF Documentation Site — Styles
   Fully accessible: WCAG 2.2 AA compliant
   ============================================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    --color-primary: #1a3a6a;
    --color-primary-light: #2a5298;
    --color-primary-dark: #0d1f3c;
    --color-accent: #ff6b35;
    --color-accent-light: #ff8c5a;
    --color-success: #28a745;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fb;
    --color-bg-code: #f0f2f5;
    --color-text: #1a1a2e;
    --color-text-secondary: #4a4a5a;
    --color-border: #d1d5db;
    --color-link: #1a5298;
    --color-link-visited: #4a2a8a;
    --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    --max-width: 1200px;
    --sidebar-width: 280px;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.12);
    --transition: 0.2s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* --- Skip Link (Accessibility) --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 var(--radius) var(--radius);
    z-index: 1000;
    font-weight: 600;
    text-decoration: none;
    transition: top var(--transition);
}

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

/* --- Layout --- */
.site-wrapper {
    display: flex;
    min-height: 100vh;
}

/* --- Sidebar Navigation --- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-primary-dark);
    color: #fff;
    padding: 1.5rem 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-brand {
    padding: 0 1.25rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.brand-link {
    display: inline-block;
    max-width: 100%;
}

.brand-link:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
    border-radius: var(--radius);
}

.brand-logo {
    display: block;
    width: 100%;
    max-width: 220px;
    height: auto;
}

.sidebar-brand .tagline {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0;
}

.sidebar nav {
    padding: 0 0.75rem;
}

.sidebar .nav-section {
    margin-bottom: 1.25rem;
}

.sidebar .nav-section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.5);
    padding: 0 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.sidebar a {
    display: block;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: background var(--transition), color var(--transition);
}

.sidebar a:hover,
.sidebar a:focus {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.sidebar a.active {
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
}

.sidebar a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* --- Main Content --- */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-width: 0;
}

/* --- Hero Section --- */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: #fff;
    padding: 4rem 2rem;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero .hero-tagline {
    font-size: 1.3rem;
    font-weight: 600;
    max-width: 750px;
    margin: 0 auto 1.5rem;
    opacity: 1;
    line-height: 1.5;
}

.hero-badges {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
}

.hero-cta {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background var(--transition), transform var(--transition);
    border: none;
    cursor: pointer;
}

.btn:focus-visible {
    outline: 3px solid var(--color-accent-light);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* --- Content Sections --- */
.content-section {
    padding: 3rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

/* --- Code Blocks --- */
.code-example {
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 1.5rem 0;
    box-shadow: var(--shadow);
}

.code-example-header {
    background: var(--color-primary-dark);
    color: #fff;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.code-example pre {
    margin: 0;
    padding: 1.25rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text);
}

.code-example code {
    font-family: var(--font-mono);
}

/* Inline code */
p code, li code, td code {
    background: var(--color-bg-code);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875em;
    color: var(--color-primary);
}

/* --- Feature Cards --- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.feature-card h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.feature-card .card-link {
    color: var(--color-link);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.feature-card .card-link:hover {
    text-decoration: underline;
}

.feature-card .card-link:focus-visible {
    outline: 2px solid var(--color-link);
    outline-offset: 2px;
}

/* --- PDF Preview (placeholder — hidden when real screenshots exist) --- */
.pdf-preview {
    display: none;
}

.pdf-preview .emoji-placeholder {
    font-size: 4rem;
    margin-bottom: 0.75rem;
}

.pdf-preview p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* Hidden image placeholders — site-level illustrations not yet created */
.image-placeholder {
    display: none;
}

/* --- Example Screenshot Images --- */
.example-row img:not(.image-placeholder) {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 1rem 0;
    object-fit: contain;
}

/* --- Example Row --- */
.example-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
    align-items: start;
}

@media (max-width: 900px) {
    .example-row {
        grid-template-columns: 1fr;
    }
}

/* --- Download Buttons --- */
.download-group {
      display: flex;
      gap: 0.75rem;
      flex-wrap: wrap;
      margin-top: 1rem;
  }

  .image-caption {
      font-size: 0.82rem;
      color: var(--color-text-secondary);
      font-style: italic;
      margin: 0.4rem 0 0;
      text-align: center;
      line-height: 1.4;
  }

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: background var(--transition);
}

.btn-download:hover {
    background: var(--color-primary-light);
}

.btn-download:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* --- Tables --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.95rem;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
}

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

/* --- Accessibility Note Banner --- */
.a11y-banner {
    background: linear-gradient(90deg, #e8f5e9, #f1f8e9);
    border-left: 4px solid var(--color-success);
    padding: 1.25rem 1.5rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 1.5rem 0;
}

.a11y-banner h3 {
    color: #1b5e20;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.a11y-banner p {
    font-size: 0.95rem;
    color: #2e7d32;
}

/* --- Pricing Section --- */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.pricing-card {
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: box-shadow var(--transition);
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--color-accent);
    position: relative;
}

.pricing-card.featured::before {
    content: 'Most Common';
    position: absolute;
    top: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: #fff;
    padding: 0.2rem 1rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.pricing-card h3 {
    font-size: 1.3rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    margin: 1rem 0;
}

.pricing-card .price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.pricing-card ul {
    list-style: none;
    margin: 1.5rem 0;
    text-align: left;
}

.pricing-card li {
    padding: 0.4rem 0;
    font-size: 0.95rem;
}

.pricing-card li::before {
    content: '✓ ';
    color: var(--color-success);
    font-weight: 700;
}

/* --- Footer --- */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 2rem;
    text-align: center;
    font-size: 0.9rem;
}

.site-footer a {
    color: var(--color-accent-light);
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .content-section {
        padding: 2rem 1rem;
    }

    .mobile-menu-btn {
        display: block;
        position: fixed;
        top: 1rem;
        left: 1rem;
        z-index: 200;
        background: var(--color-primary);
        color: #fff;
        border: none;
        border-radius: var(--radius);
        padding: 0.5rem 0.75rem;
        font-size: 1.2rem;
        cursor: pointer;
    }
}

@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none;
    }
}

/* --- Focus Styles (Accessibility) --- */
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }

    html {
        scroll-behavior: auto;
    }
}