/**
 * Friction Atlas Styles
 * Minimalist, analytical design with system fonts
 */

/* === CSS Variables === */
:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-text-subtle: #999999;
    --color-border: #e0e0e0;
    --color-border-strong: #c0c0c0;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #64748b;
    --color-accent: #0891b2;
    --color-critical: #5a3a38;
    --color-critical-bg: #f8f6f6;
    --color-critical-border: #d4c5c3;
    --color-bridge: #2c4a3e;
    --color-bridge-bg: #f5f7f6;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
    --spacing-section: 5rem;
    --border-radius: 0.25rem;
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --max-width-readable: 68ch;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f0f0f;
        --color-text: #e5e5e5;
        --color-text-muted: #a3a3a3;
        --color-text-subtle: #737373;
        --color-border: #2a2a2a;
        --color-border-strong: #404040;
        --color-primary: #3b82f6;
        --color-primary-hover: #60a5fa;
        --color-secondary: #94a3b8;
        --color-accent: #06b6d4;
        --color-critical: #9a7c79;
        --color-critical-bg: #1a1514;
        --color-critical-border: #3a2f2d;
        --color-bridge: #5a7268;
        --color-bridge-bg: #131715;
    }
}

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

* {
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-system);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h1 { 
    font-size: 2.25rem; 
    font-weight: 600;
    letter-spacing: -0.02em;
}

h2 { 
    font-size: 1.75rem; 
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-lg);
}

h3 { 
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
}

h4 { 
    font-size: 1rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
    max-width: var(--max-width-readable);
    line-height: 1.8;
}

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

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

strong {
    font-weight: 600;
}

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

.site-main {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

/* === Header === */
.site-header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    background-color: var(--color-bg);
}

.site-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
}

.nav-menu a:hover {
    color: var(--color-text);
}

.nav-menu a.active {
    color: var(--color-text);
    border-bottom: 2px solid var(--color-primary);
}

/* === Footer === */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xxl);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

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

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

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-text);
    text-decoration: underline;
}

.footer-separator {
    color: var(--color-border-strong);
}

/* === Hero (Homepage) === */
.hero {
    max-width: var(--max-width-narrow);
    margin: var(--spacing-xxl) auto;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.hero-content {
    margin: var(--spacing-lg) 0;
}

.hero-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.hero-actions {
    margin-top: var(--spacing-xl);
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    text-decoration: none;
    color: #fff;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

.btn-secondary:hover {
    border-color: var(--color-text);
    text-decoration: none;
}

/* === Breadcrumb === */
.breadcrumb {
    margin-bottom: var(--spacing-lg);
}

.breadcrumb ol {
    display: flex;
    gap: var(--spacing-xs);
    list-style: none;
    flex-wrap: wrap;
    font-size: 0.875rem;
}

.breadcrumb li:not(:last-child)::after {
    content: "→";
    margin-left: var(--spacing-xs);
    color: var(--color-text-muted);
}

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

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

.breadcrumb span[aria-current] {
    color: var(--color-text);
}

/* === Search === */
.atlas-intro {
    margin: var(--spacing-lg) 0;
    max-width: var(--max-width-narrow);
}

.search-container {
    margin: var(--spacing-xl) 0 var(--spacing-lg);
    max-width: 600px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-family: var(--font-system);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.search-count {
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* === Archetype Grid (Overview) === */
.archetype-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.archetype-card {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.archetype-card:hover {
    border-color: var(--color-border-strong);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.card-header {
    margin-bottom: var(--spacing-sm);
}

.friction-id {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
}

.card-title {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

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

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

.card-excerpt {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.card-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.no-results {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    color: var(--color-text-muted);
}

/* === Key Takeaway Box === */
.key-takeaway-box {
    margin: var(--spacing-xl) 0 var(--spacing-xxl);
    border-left: 2px solid var(--color-border);
    padding: 0 0 0 var(--spacing-md);
}

.key-takeaway-label {
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
    margin-bottom: var(--spacing-xs);
}

.key-takeaway-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text);
    margin: 0;
    max-width: var(--max-width-readable);
}

/* === Archetype Detail === */
.archetype-header {
    margin-bottom: var(--spacing-xxl);
}

.friction-id-large {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
}

.archetype-header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* === Sections === */
.section {
    margin-bottom: var(--spacing-section);
    padding-bottom: 0;
    border-bottom: none;
}

.section:last-of-type {
    border-bottom: none;
}

.section h2 {
    font-size: 1.75rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

.subsection {
    margin-bottom: var(--spacing-xl);
}

.subsection:last-child {
    margin-bottom: 0;
}

.subsection h3 {
    font-size: 0.75rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-subtle);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.subsection:first-child h3 {
    margin-top: 0;
}

.subsection p {
    font-size: 1rem;
    line-height: 1.8;
    max-width: var(--max-width-readable);
}

/* === Risk Profile === */
.risk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.risk-item {
    border: none;
    border-left: 2px solid var(--color-border);
    padding: 0 0 0 var(--spacing-md);
}

.risk-item h3 {
    font-size: 0.6875rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 500;
}

.risk-value {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
    font-style: italic;
}

.risk-definition {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 0;
    max-width: 50ch;
}

/* === Lists === */
.fallout-list {
    list-style: none;
    padding-left: 0;
}

.fallout-list li {
    padding-left: var(--spacing-md);
    position: relative;
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    max-width: var(--max-width-readable);
}

.fallout-list li::before {
    content: "-";
    position: absolute;
    left: 0;
    color: var(--color-text-muted);
    font-weight: normal;
}

/* === Manifestations === */
.manifestation-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.filter-select {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 1rem;
    font-family: var(--font-system);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.manifestation-list {
    display: grid;
    gap: var(--spacing-lg);
}

.manifestation-item {
    border: none;
    border-left: 2px solid var(--color-border);
    padding: 0 0 0 var(--spacing-md);
}

.manifestation-meta {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    margin-bottom: var(--spacing-md);
    font-size: 0.8125rem;
}

.meta-tag {
    color: var(--color-text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.meta-tag:first-child {
    color: var(--color-text);
    font-weight: 700;
    font-size: 0.875rem;
}

.meta-separator {
    color: var(--color-border-strong);
}

.manifestation-item h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    text-transform: none;
    letter-spacing: -0.01em;
    font-weight: 600;
    line-height: 1.4;
}

.manifestation-item p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    line-height: 1.7;
    max-width: var(--max-width-readable);
}

.no-manifestations {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-muted);
}

/* === Resolution Boundary === */
.section-critical {
    border: none;
    border-left: 2px solid var(--color-critical-border);
    padding: var(--spacing-md) 0 var(--spacing-md) var(--spacing-md);
    background-color: transparent;
    margin-left: 0;
    padding-left: var(--spacing-lg);
}

.decision-level {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-critical);
    margin-bottom: var(--spacing-sm);
}

.critical-notice {
    background-color: transparent;
    color: var(--color-text);
    padding: var(--spacing-md) 0;
    border: none;
    text-align: left;
    margin: var(--spacing-lg) 0;
    font-size: 0.9375rem;
    border-top: 1px solid var(--color-border);
    border-bottom: none;
}

.critical-notice strong {
    font-weight: 500;
    letter-spacing: 0.005em;
    color: var(--color-critical);
}

.resolution-items {
    display: grid;
    gap: var(--spacing-lg);
}

.resolution-category h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 600;
}

.resolution-category ul {
    list-style: none;
    padding-left: 0;
}

.resolution-category li {
    padding-left: var(--spacing-md);
    position: relative;
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.resolution-category li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--color-critical);
    font-weight: normal;
}

/* === AERIM Bridge === */
.section-bridge {
    border: none;
    border-left: 2px solid var(--color-border);
    padding: var(--spacing-md) 0 var(--spacing-md) var(--spacing-md);
    background-color: transparent;
    margin-left: 0;
    padding-left: var(--spacing-lg);
}

.section-bridge h2 {
    color: var(--color-text-muted);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.section-bridge p {
    max-width: var(--max-width-readable);
    line-height: 1.8;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

.aerim-link-container {
    margin-top: var(--spacing-md);
}

.aerim-link-container a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.875rem;
    display: inline;
    border: none;
    background: none;
    padding: 0;
    letter-spacing: 0.02em;
}

.aerim-link-container a:hover {
    text-decoration: underline;
    color: var(--color-text);
    background: none;
}

/* === Technical Factsheet Download === */
#technical-factsheet {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.factsheet-download {
    display: flex;
    justify-content: center;
}

.factsheet-download .btn {
    display: inline-flex;
    align-items: center;
}

.factsheet-download svg {
    flex-shrink: 0;
}

/* === Prev/Next Navigation === */
.prev-next {
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
}

.prev-next-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.prev-link,
.next-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color 0.2s, background-color 0.2s;
}

.prev-link:hover,
.next-link:hover {
    border-color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.05);
    text-decoration: none;
}

.prev-link {
    justify-content: flex-start;
}

.next-link {
    justify-content: flex-end;
    text-align: right;
}

.prev-link.disabled,
.next-link.disabled {
    opacity: 0;
    pointer-events: none;
}

.prev-next .arrow {
    font-size: 1.5rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.prev-next .label {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 0 var(--spacing-sm);
}

.prev-next .small {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    font-weight: 600;
}

.prev-next .title {
    font-size: 0.9375rem;
    font-weight: 500;
}

/* === Error Page === */
.error-page {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.error-page h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.error-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* === Legal Pages === */
.legal-page {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.legal-page h1 {
    margin-bottom: var(--spacing-xl);
}

.legal-section {
    margin-bottom: var(--spacing-xl);
}

.legal-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.legal-section h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
    color: var(--color-text);
    font-weight: 600;
}

.legal-section h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 600;
}

.legal-section p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.legal-section ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.legal-section li {
    margin-bottom: var(--spacing-xs);
}

/* === Accessibility === */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* === Responsive === */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .archetype-grid {
        grid-template-columns: 1fr;
    }
    
    .risk-grid {
        grid-template-columns: 1fr;
    }
    
    .manifestation-filters {
        flex-direction: column;
    }
    
    .prev-next-inner {
        grid-template-columns: 1fr;
    }
    
    .next-link {
        text-align: left;
        justify-content: flex-start;
    }
    
    .next-link .label {
        order: -1;
    }
    
    .nav-menu {
        gap: var(--spacing-md);
    }
    
    .error-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .section-critical,
    .section-bridge {
        margin-left: 0;
        padding-left: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .site-header nav {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: flex-start;
    }
}