/*
 * GTM Operating System — Blueprint Theme
 * Technical blueprint/schematic aesthetic
 * Steel blue + cyan + dark navy
 */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --steel-blue: #1E3A5F;
    --steel-700: #254A78;
    --steel-600: #2D5A91;
    --cyan: #0EA5E9;
    --cyan-light: #38BDF8;
    --cyan-muted: rgba(14,165,233,0.10);
    --cyan-border: rgba(14,165,233,0.25);
    --navy-900: #0F172A;
    --navy-800: #1E293B;
    --navy-700: #334155;
    --gray-bg: #F1F5F9;
    --gray-100: #F8FAFC;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --white: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --grid-line: rgba(14,165,233,0.06);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-primary);
    background: var(--gray-bg);
    -webkit-font-smoothing: antialiased;
}

/* === GRID BACKGROUND PATTERN === */

body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 40px 40px;
}

body > * { position: relative; z-index: 1; }

/* === MASTHEAD === */

.masthead {
    background: var(--navy-900);
    padding: 1.5rem 1.5rem 0.6rem;
    text-align: center;
    border-bottom: 2px solid var(--cyan);
}

.masthead-inner {
    max-width: 56rem;
    margin: 0 auto;
}

.masthead-brand {
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.brand-icon {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--cyan);
    background: rgba(14,165,233,0.12);
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    border: 1px solid rgba(14,165,233,0.25);
}

.brand-title {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--white);
    letter-spacing: -0.02em;
}

.masthead-tagline {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--gray-400);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: 0.25rem;
}

/* === NAVIGATION === */

.site-nav {
    background: var(--navy-800);
    border-bottom: 1px solid rgba(14,165,233,0.15);
}

.site-nav .nav-inner {
    max-width: 56rem;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: center;
}

.site-nav .nav-links {
    display: flex;
    list-style: none;
    gap: 0;
}

.site-nav .nav-links li a {
    display: block;
    padding: 0.65rem 1.25rem;
    color: var(--gray-400);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color 0.15s, border-color 0.15s;
    border-bottom: 2px solid transparent;
}

.site-nav .nav-links li a:hover {
    color: var(--white);
    border-bottom-color: var(--cyan);
}

.site-nav .nav-links li.active a {
    color: var(--cyan-light);
    border-bottom-color: var(--cyan);
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid rgba(14,165,233,0.3);
    color: var(--cyan-light);
    cursor: pointer;
    padding: 0.4rem 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 500;
    margin: 0.5rem auto;
}

/* === BLUEPRINT HERO === */

.blueprint-hero {
    background: var(--navy-900);
    padding: 3.5rem 1.5rem 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.blueprint-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(14,165,233,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14,165,233,0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

.blueprint-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

.blueprint-hero .hero-inner {
    position: relative;
    z-index: 1;
    max-width: 40rem;
    margin: 0 auto;
}

.hero-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 0.75rem;
}

.blueprint-hero h1 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-deck {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-400);
    max-width: 34rem;
    margin: 0 auto;
}

.hero-rule {
    width: 3rem;
    height: 2px;
    background: var(--cyan);
    margin: 2rem auto 0;
    border: none;
}

/* === CONTENT AREA === */

.content-wrap {
    max-width: 52rem;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.content {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 2.5rem 2.5rem 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.25rem;
    margin: 1.5rem 0;
    border: 1px solid var(--border);
}

/* === TYPOGRAPHY === */

.content h1 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--steel-blue);
    line-height: 1.25;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.content h2 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--steel-blue);
    line-height: 1.3;
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
}

.content h2::before {
    content: '## ';
    color: var(--cyan);
    font-weight: 400;
    opacity: 0.5;
}

.content h3 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 700;
    color: var(--steel-700);
    margin-top: 2rem;
    margin-bottom: 0.5rem;
}

.content h4 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.content strong {
    color: var(--text-primary);
    font-weight: 700;
}

.content a {
    color: var(--steel-blue);
    text-decoration: underline;
    text-decoration-color: var(--cyan);
    text-underline-offset: 2px;
    font-weight: 600;
    transition: color 0.15s;
}

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

.content hr {
    border: none;
    height: 1px;
    background: var(--border);
    margin: 2.5rem 0;
}

/* === LISTS === */

.content ul, .content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.25rem;
}

.content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.content li strong {
    color: var(--text-primary);
}

/* === TABLES === */

.content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    line-height: 1.5;
    overflow-x: auto;
    display: block;
}

.content thead th {
    background: var(--steel-blue);
    color: var(--white);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    padding: 0.7rem 0.9rem;
    text-align: left;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.content tbody td {
    padding: 0.6rem 0.9rem;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: top;
    background: var(--white);
}

.content tbody tr:hover td {
    background: var(--cyan-muted);
}

.content tbody tr:last-child td {
    border-bottom: 2px solid var(--steel-blue);
}

.content tbody td:first-child {
    font-weight: 600;
    color: var(--steel-blue);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
}

/* Harvey ball alignment */
.content td:not(:first-child),
.content th:not(:first-child) {
    text-align: center;
}

/* === HARVEY BALL SPRITE === */
/* SVG sprite: 5 balls at 24px cells = 120x24 */
/* Steel blue stroke (#1E3A5F), cyan fill (#0EA5E9) */

.hb {
    display: inline-block;
    width: 22px;
    height: 22px;
    background-image: url("data:image/svg+xml;base64,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");
    background-repeat: no-repeat;
    background-size: 110px 22px;
    vertical-align: middle;
    position: relative;
}

.hb-1 { background-position: 0 0; }
.hb-2 { background-position: -22px 0; }
.hb-3 { background-position: -44px 0; }
.hb-4 { background-position: -66px 0; }
.hb-5 { background-position: -88px 0; }

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

/* === BLOCKQUOTES — Technical callout style === */

.content blockquote {
    border-left: 3px solid var(--cyan);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    background: var(--navy-900);
    color: var(--gray-300);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    border-radius: 0 0.35rem 0.35rem 0;
}

.content blockquote p {
    color: var(--gray-300);
}

.content blockquote p:last-child {
    margin-bottom: 0;
}

.content blockquote strong {
    color: var(--cyan-light);
    font-style: normal;
}

/* === CODE BLOCKS === */

.content code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.83em;
    background: var(--gray-100);
    padding: 0.15em 0.4em;
    border-radius: 0.2rem;
    color: var(--steel-blue);
    border: 1px solid var(--gray-200);
}

.content pre {
    background: var(--navy-900);
    color: #CBD5E1;
    padding: 1.25rem 1.5rem;
    border-radius: 0.35rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border: 1px solid var(--navy-700);
    position: relative;
}

.content pre::before {
    content: '>';
    position: absolute;
    top: 0.35rem;
    right: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--cyan);
    opacity: 0.4;
}

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

/* === GLOSSARY INDEX GRID === */

.glossary-index .content ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.75rem;
}

.glossary-index .content li {
    margin: 0;
}

.glossary-index .content li a {
    display: block;
    padding: 1rem 1.25rem;
    background: var(--gray-100);
    border: 1px solid var(--border);
    border-radius: 0.35rem;
    text-decoration: none;
    color: var(--steel-blue);
    font-weight: 600;
    font-size: 0.92rem;
    transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.glossary-index .content li a:hover {
    border-color: var(--cyan);
    background: var(--white);
    box-shadow: 0 2px 8px rgba(14,165,233,0.08);
    color: var(--cyan);
}

/* === GLOSSARY ENTRY STYLING === */

.glossary-entry .content h2:first-of-type {
    margin-top: 1.5rem;
}

/* === COMPARISON DETAIL === */

.comparison-detail .content table {
    font-size: 0.82rem;
}

/* === LANDSCAPE DETAIL === */

.landscape-detail .content {
    max-width: none;
}

/* === FOOTER === */

.site-footer {
    background: var(--navy-900);
    color: var(--gray-400);
    padding: 2.5rem 1.5rem;
    text-align: center;
    border-top: 2px solid var(--cyan);
}

.footer-inner {
    max-width: 52rem;
    margin: 0 auto;
}

.footer-brand {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-brand .brand-icon {
    font-size: 0.8rem;
    padding: 0.1rem 0.35rem;
}

.footer-disclosure {
    font-size: 0.78rem;
    margin-bottom: 0.25rem;
}

.footer-copy {
    font-size: 0.72rem;
    color: var(--navy-700);
}

/* === RESPONSIVE === */

@media (max-width: 768px) {
    .nav-toggle { display: block; }

    .site-nav .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding-bottom: 0.5rem;
    }

    .site-nav .nav-links.open { display: flex; }

    .site-nav .nav-inner {
        flex-direction: column;
    }

    .site-nav .nav-links li a {
        text-align: center;
        padding: 0.5rem 1rem;
    }

    .masthead { padding: 1.25rem 1rem 0.5rem; }
    .brand-title { font-size: 1.1rem; }

    .blueprint-hero { padding: 2rem 1rem 1.5rem; }
    .blueprint-hero h1 { font-size: 1.65rem; }

    .content-wrap { padding: 1.5rem 0.75rem 3rem; }
    .content { padding: 1.5rem 1.25rem 1.25rem; }

    .glossary-index .content ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .blueprint-hero h1 { font-size: 1.35rem; }
    .hero-deck { font-size: 0.9rem; }
    .content h1 { font-size: 1.35rem; }
    .content h2 { font-size: 1.05rem; }
    .content { padding: 1.25rem 1rem 1rem; }
}