/* ============================================================
   Dextorix.org — Documentation-style CSS
   Design: Clean white documentation with security-blue primary
   Mobile-first, semantic, accessible
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --color-primary: #1a3a5c;
    --color-primary-light: #2557a7;
    --color-primary-bg: #e8f0fb;
    --color-accent: #1e7e34;
    --color-accent-bg: #e8f5e9;
    --color-warning: #b45309;
    --color-warning-bg: #fef3c7;
    --color-danger: #c0392b;
    --color-danger-bg: #fde8e6;

    --color-canvas: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #dee2e6;
    --color-border-soft: #e9ecef;

    --color-ink: #212529;
    --color-body: #495057;
    --color-muted: #6c757d;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-section: 80px;

    --header-height: 64px;
    --container-max: 1200px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-ink);
    background-color: var(--color-surface);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

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

a {
    color: var(--color-primary-light);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.15s;
}

a:focus-visible {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 3px;
    border-radius: 2px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
    color: var(--color-primary);
    line-height: 1.25;
    font-weight: 600;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; }
h2 { font-size: clamp(1.35rem, 3vw, 1.875rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }
h4 { font-size: 1.1rem; }

p { color: var(--color-body); margin-bottom: var(--spacing-md); max-width: 72ch; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: var(--spacing-lg); color: var(--color-body); }
li { margin-bottom: var(--spacing-xs); }

code {
    font-family: var(--font-mono);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
    color: var(--color-primary);
}

pre {
    background: var(--color-primary);
    color: #e8f0fb;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    margin: var(--spacing-lg) 0;
}

pre code { background: none; border: none; padding: 0; color: inherit; }

blockquote {
    border-left: 4px solid var(--color-primary-light);
    background: var(--color-primary-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--color-body);
}

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container { padding: 0 var(--spacing-xl); }
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-primary);
    border-bottom: 3px solid var(--color-primary-light);
    height: var(--header-height);
}

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

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: #ffffff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}

.logo-icon { font-size: 1.4rem; }

.logo-text {
    color: #ffffff;
    font-size: 1.2rem;
}

/* Nav */
.primary-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary);
    border-top: 1px solid rgba(255,255,255,0.15);
    padding: var(--spacing-sm) 0;
    z-index: 99;
}

.primary-nav.is-open { display: block; }

.nav-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.nav-item .nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: rgba(255,255,255,0.88);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
}

.nav-item .nav-link:hover,
.nav-item.active .nav-link {
    color: #ffffff;
    background: rgba(255,255,255,0.12);
}

.nav-item.active .nav-link {
    border-left: 3px solid #ffffff;
}

.nav-icon { font-size: 1rem; }

/* Hamburger */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.hamburger {
    display: block;
    width: 22px;
    height: 2px;
    background: #ffffff;
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .primary-nav {
        display: block;
        position: static;
        background: none;
        border: none;
        padding: 0;
    }
    .nav-list { flex-direction: row; gap: 2px; }
    .nav-item .nav-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        border-radius: var(--radius-sm);
        font-size: 0.85rem;
    }
    .nav-item.active .nav-link {
        border-left: none;
        border-bottom: 2px solid #ffffff;
    }
}

/* --- Hero Section --- */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #2557a7 100%);
    color: #ffffff;
    padding: var(--spacing-xxl) 0;
}

.hero-inner {
    display: grid;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (min-width: 768px) {
    .hero-inner { grid-template-columns: 1fr 1fr; }
}

.hero-content h1 {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
    line-height: 1.15;
}

.hero-content p {
    color: rgba(255,255,255,0.85);
    font-size: 1.1rem;
    max-width: 55ch;
    margin-bottom: var(--spacing-xl);
}

.hero-image img {
    border-radius: var(--radius-lg);
    border: 2px solid rgba(255,255,255,0.2);
    max-height: 280px;
    width: 100%;
    object-fit: cover;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid transparent;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    letter-spacing: 0.02em;
    min-height: 44px;
}

.btn-primary {
    background: var(--color-primary-light);
    color: #ffffff;
    border-color: var(--color-primary-light);
}

.btn-outline {
    background: transparent;
    color: #ffffff;
    border-color: rgba(255,255,255,0.6);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
    min-height: 36px;
}

/* --- Cards Grid --- */
.section { padding: var(--spacing-section) 0; }
.section-alt { background: var(--color-canvas); }

.section-header {
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 { margin-bottom: var(--spacing-sm); }
.section-header p { font-size: 1.05rem; max-width: 65ch; }

.cards-grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
}

@media (min-width: 560px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
    .cards-grid { grid-template-columns: repeat(3, 1fr); }
}

.card {
    background: var(--color-canvas);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
}

.card:focus-within,
.card:has(a:focus-visible) {
    box-shadow: var(--shadow-md);
}

.card-img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    background: var(--color-primary-bg);
}

.card-img-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--color-primary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.card-body {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-xs);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.card-desc {
    font-size: 0.9rem;
    color: var(--color-body);
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.card-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: auto;
}

.card-link::after { content: ' →'; }

/* --- Page Layout (inner pages) --- */
.page-hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #2557a7 100%);
    color: #ffffff;
    padding: var(--spacing-xl) 0;
}

.page-hero h1 { color: #ffffff; margin-bottom: var(--spacing-sm); }
.page-hero p { color: rgba(255,255,255,0.85); max-width: 65ch; }

.page-layout {
    display: grid;
    gap: var(--spacing-xxl);
    padding: var(--spacing-xxl) 0;
}

@media (min-width: 960px) {
    .page-layout {
        grid-template-columns: 260px 1fr;
        align-items: start;
    }
}

/* Sidebar */
.page-sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-lg));
    align-self: start;
}

.toc {
    background: var(--color-canvas);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.toc h3 {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-sm);
}

.toc ol {
    padding-left: var(--spacing-md);
    counter-reset: toc-counter;
    list-style: none;
}

.toc li { counter-increment: toc-counter; margin-bottom: 6px; }

.toc a {
    font-size: 0.875rem;
    color: var(--color-body);
    text-decoration: none;
    display: flex;
    align-items: flex-start;
    gap: 6px;
    line-height: 1.4;
}

.toc a::before {
    content: counter(toc-counter) '.';
    color: var(--color-muted);
    font-size: 0.75rem;
    flex-shrink: 0;
    padding-top: 2px;
}

/* Page Content */
.page-content { min-width: 0; }

.page-content section { margin-bottom: var(--spacing-xxl); }

.page-content h2 {
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    scroll-margin-top: calc(var(--header-height) + 20px);
}

.page-content h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    scroll-margin-top: calc(var(--header-height) + 20px);
}

/* Breadcrumb */
.breadcrumb {
    background: none;
    padding: var(--spacing-lg) 0 0;
}

.breadcrumb ol {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
    font-size: 0.875rem;
}

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

.breadcrumb-item a {
    color: var(--color-primary-light);
    text-decoration: none;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    margin-left: 6px;
    color: var(--color-border);
}

.breadcrumb-item.active { color: var(--color-body); }

/* --- Callout Boxes --- */
.callout {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
    border-left: 4px solid;
}

.callout-icon { font-size: 1.25rem; flex-shrink: 0; padding-top: 2px; }
.callout-content p { margin: 0; font-size: 0.9rem; }
.callout-content strong { display: block; margin-bottom: 4px; font-size: 0.95rem; }

.callout-info {
    background: var(--color-primary-bg);
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}
.callout-info p { color: var(--color-primary); }

.callout-success {
    background: var(--color-accent-bg);
    border-color: var(--color-accent);
}
.callout-success p { color: #155724; }

.callout-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
}
.callout-warning p { color: #7c4700; }

.callout-danger {
    background: var(--color-danger-bg);
    border-color: var(--color-danger);
}
.callout-danger p { color: #721c24; }

/* --- FAQ / Details --- */
.faq-list { list-style: none; padding: 0; }

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
    background: var(--color-canvas);
    overflow: hidden;
}

.faq-item details { }

.faq-item summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    list-style: none;
    color: var(--color-ink);
    gap: var(--spacing-md);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-muted);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.faq-item details[open] summary::after {
    content: '−';
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    color: var(--color-body);
    font-size: 0.9rem;
}

/* --- Related Content --- */
.related-content {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xxl);
    border: 1px solid var(--color-border);
}

.related-content h3 {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--spacing-md);
}

.related-list {
    list-style: none;
    padding: 0;
    display: grid;
    gap: var(--spacing-xs);
}

@media (min-width: 560px) {
    .related-list { grid-template-columns: 1fr 1fr; }
}

.related-list li {
    margin: 0;
    background: var(--color-canvas);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
}

.related-list a {
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--color-primary-light);
    display: block;
}

.related-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--color-muted);
    margin-top: 2px;
}

/* --- Step List --- */
.step-list {
    list-style: none;
    padding: 0;
    counter-reset: step-counter;
}

.step-list li {
    counter-increment: step-counter;
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
}

.step-list li::before {
    content: counter(step-counter);
    background: var(--color-primary);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.85rem;
    min-width: 32px;
    height: 32px;
    border-radius: var(--radius-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* --- Feature Table --- */
.feature-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.feature-table th {
    background: var(--color-primary);
    color: #ffffff;
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
}

.feature-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border-soft);
    color: var(--color-body);
    vertical-align: top;
}

.feature-table tr:last-child td { border-bottom: none; }
.feature-table tr:nth-child(even) td { background: var(--color-surface); }

.badge-yes { color: var(--color-accent); font-weight: 700; }
.badge-no { color: var(--color-danger); font-weight: 700; }

/* --- Image Figure --- */
.content-figure {
    margin: var(--spacing-xl) 0;
}

.content-figure img {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    max-width: 100%;
}

.content-figure figcaption {
    font-size: 0.8rem;
    color: var(--color-muted);
    margin-top: var(--spacing-xs);
    font-style: italic;
    text-align: center;
}

/* --- Highlight Box --- */
.highlight-box {
    background: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.highlight-box h3 { color: #ffffff; margin-bottom: var(--spacing-sm); }
.highlight-box p { color: rgba(255,255,255,0.85); max-width: 65ch; }

/* --- Security Level Meter --- */
.security-meter {
    margin: var(--spacing-md) 0;
}

.security-meter .meter-label {
    font-size: 0.85rem;
    color: var(--color-muted);
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
}

.meter-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: var(--radius-pill);
    overflow: hidden;
}

.meter-fill {
    height: 100%;
    border-radius: var(--radius-pill);
    background: var(--color-accent);
    transition: width 0.4s ease;
}

.meter-fill.weak { background: var(--color-danger); width: 25%; }
.meter-fill.fair { background: var(--color-warning); width: 50%; }
.meter-fill.good { background: #2196f3; width: 75%; }
.meter-fill.strong { background: var(--color-accent); width: 100%; }

/* --- Tag / Badge --- */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.tag-info { background: var(--color-primary-bg); color: var(--color-primary-light); }
.tag-success { background: var(--color-accent-bg); color: var(--color-accent); }
.tag-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.tag-danger { background: var(--color-danger-bg); color: var(--color-danger); }

/* --- Footer --- */
.site-footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.8);
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 640px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.footer-col p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    max-width: 36ch;
    line-height: 1.6;
}

.footer-col h4 {
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.footer-col ul {
    list-style: none;
    padding: 0;
}

.footer-col ul li { margin-bottom: var(--spacing-xs); }

.footer-col ul a {
    color: rgba(255,255,255,0.7);
    font-size: 0.875rem;
    text-decoration: none;
}

.footer-col ul a:hover { color: #ffffff; }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding-top: var(--spacing-lg);
}

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    max-width: none;
}

/* --- Utilities --- */
.text-muted { color: var(--color-muted) !important; }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--spacing-lg); }

/* --- Responsive adjustments --- */
@media (max-width: 559px) {
    .section { padding: var(--spacing-xxl) 0; }
    .hero { padding: var(--spacing-xl) 0; }
    .page-layout { gap: var(--spacing-xl); }
    .page-sidebar { position: static; }
}