/* ==========================================================================
   Topacio Copyright & Documentation Resource
   Editorial archive visual style
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
    /* Palette */
    --color-bg: #f6f3ee;            /* soft stone / warm white */
    --color-bg-alt: #efeae1;        /* paper alt */
    --color-surface: #ffffff;
    --color-ink: #1f2326;           /* graphite */
    --color-ink-soft: #4a5057;
    --color-muted: #7a7368;
    --color-rule: #d8d1c3;          /* thin divider */
    --color-rule-strong: #b9b0a0;
    --color-teal: #1f4f4a;          /* deep teal accent */
    --color-teal-deep: #143734;
    --color-bronze: #8a6a3b;        /* muted bronze */
    --color-bronze-soft: #b18a52;

    /* Typography */
    --font-serif: "Cormorant Garamond", "EB Garamond", "Playfair Display", Georgia, "Times New Roman", serif;
    --font-sans: "Inter", "Helvetica Neue", Arial, system-ui, -apple-system, sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

    /* Layout */
    --container: 1120px;
    --container-narrow: 820px;
    --radius: 2px;
    --shadow-sm: 0 1px 2px rgba(20, 22, 24, 0.04);
    --shadow-md: 0 6px 24px rgba(20, 22, 24, 0.06);

    /* Motion */
    --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-ink);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--color-teal); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--color-bronze); }
button { font-family: inherit; cursor: pointer; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 500;
    color: var(--color-ink);
    letter-spacing: -0.005em;
    margin: 0 0 0.5em;
    line-height: 1.2;
}
h1 { font-size: clamp(2.1rem, 3.6vw, 3.2rem); }
h2 { font-size: clamp(1.55rem, 2.4vw, 2.1rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; letter-spacing: .02em; }

p { margin: 0 0 1.1em; color: var(--color-ink-soft); }

.eyebrow {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--color-bronze);
    margin-bottom: 1.1rem;
}
.eyebrow::before {
    content: "";
    display: inline-block;
    width: 24px;
    height: 1px;
    background: var(--color-bronze-soft);
    vertical-align: middle;
    margin-right: 12px;
    transform: translateY(-3px);
}

.lede {
    font-family: var(--font-serif);
    font-size: clamp(1.15rem, 1.6vw, 1.35rem);
    line-height: 1.55;
    color: var(--color-ink);
    font-weight: 400;
}

blockquote {
    margin: 1.6rem 0;
    padding: 1.1rem 1.4rem;
    border-left: 2px solid var(--color-bronze);
    background: var(--color-bg-alt);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-ink);
}

code, pre { font-family: var(--font-mono); font-size: 0.92em; }

hr {
    border: 0;
    border-top: 1px solid var(--color-rule);
    margin: 2.5rem 0;
}

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding: clamp(3rem, 6vw, 5.5rem) 0; }
.section--alt { background: var(--color-bg-alt); }
.section--paper { background: var(--color-surface); border-top: 1px solid var(--color-rule); border-bottom: 1px solid var(--color-rule); }

/* ---------- Top utility bar ---------- */
.utility-bar {
    background: var(--color-teal-deep);
    color: #e9ddc6;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
}
.utility-bar .container {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 8px; padding-bottom: 8px;
    flex-wrap: wrap; gap: 8px;
}
.utility-bar a { color: #e9ddc6; }
.utility-bar a:hover { color: #fff; }
.utility-bar .ref-id { font-family: var(--font-mono); opacity: .8; }

/* ---------- Header / nav ---------- */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-rule);
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: saturate(140%) blur(6px);
    background-color: rgba(246, 243, 238, 0.92);
}
.site-header .container {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 18px; padding-bottom: 18px;
}
.brand {
    display: inline-flex; align-items: center; gap: 12px;
    color: var(--color-ink); font-family: var(--font-serif);
}
.brand:hover { color: var(--color-ink); }
.brand-mark {
    width: 34px; height: 34px;
    border: 1px solid var(--color-rule-strong);
    display: grid; place-items: center;
    background: var(--color-surface);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-text { line-height: 1.1; }
.brand-text .brand-name { font-size: 1.15rem; font-weight: 500; letter-spacing: .01em; }
.brand-text .brand-sub {
    display: block; font-family: var(--font-sans);
    font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase;
    color: var(--color-muted);
}

.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
    color: var(--color-ink-soft);
    font-size: 0.92rem;
    letter-spacing: 0.01em;
    position: relative;
    padding: 6px 0;
}
.nav a:hover { color: var(--color-teal); }
.nav a.is-active { color: var(--color-ink); }
.nav a.is-active::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
    height: 1px; background: var(--color-bronze);
}

.nav-toggle {
    display: none;
    background: transparent; border: 1px solid var(--color-rule-strong);
    width: 40px; height: 40px; padding: 0;
    align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
    content: ""; display: block; width: 18px; height: 1px; background: var(--color-ink);
    position: relative;
}
.nav-toggle span::before { position: absolute; top: -6px; left: 0; }
.nav-toggle span::after  { position: absolute; top:  6px; left: 0; }

@media (max-width: 860px) {
    .nav-toggle { display: inline-flex; }
    .nav {
        position: absolute; top: 100%; left: 0; right: 0;
        flex-direction: column; align-items: stretch; gap: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-rule);
        padding: 8px 24px 18px;
        display: none;
    }
    .nav.is-open { display: flex; }
    .nav a { padding: 12px 0; border-bottom: 1px solid var(--color-rule); }
    .nav a:last-child { border-bottom: none; }
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: clamp(3.5rem, 7vw, 6.5rem) 0 clamp(3rem, 6vw, 5rem);
    overflow: hidden;
    border-bottom: 1px solid var(--color-rule);
}
.hero-grid {
    display: grid; grid-template-columns: 1.25fr 1fr;
    gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 .accent { color: var(--color-teal); font-style: italic; }
.hero .meta {
    display: flex; flex-wrap: wrap; gap: 18px 28px;
    margin: 1.6rem 0 0;
    padding-top: 1.4rem;
    border-top: 1px solid var(--color-rule);
    font-size: 0.85rem; color: var(--color-muted);
}
.hero .meta dt { display: inline; font-weight: 600; color: var(--color-ink-soft); letter-spacing: .04em; text-transform: uppercase; font-size: 0.72rem; }
.hero .meta dd { display: inline; margin: 0 0 0 8px; }
.hero .meta > div { min-width: 0; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 1.8rem; }

.hero-card {
    background: var(--color-surface);
    border: 1px solid var(--color-rule);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    position: relative;
}
.hero-card::before {
    content: ""; position: absolute; top: 12px; left: 12px; right: 12px; bottom: 12px;
    border: 1px solid var(--color-rule); pointer-events: none;
}
.hero-card .stamp {
    position: absolute; top: -14px; right: 24px;
    background: var(--color-bg);
    padding: 0 10px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: .14em;
    color: var(--color-bronze);
    text-transform: uppercase;
}
.hero-card h3 { font-family: var(--font-sans); font-size: 0.78rem; letter-spacing: .22em; text-transform: uppercase; color: var(--color-muted); font-weight: 600; }
.hero-card ol { margin: 0; padding-left: 0; list-style: none; counter-reset: step; }
.hero-card ol li {
    counter-increment: step;
    display: grid; grid-template-columns: 36px 1fr; gap: 12px;
    padding: 12px 0;
    border-bottom: 1px dashed var(--color-rule);
    font-size: 0.95rem;
    color: var(--color-ink-soft);
}
.hero-card ol li:last-child { border-bottom: none; }
.hero-card ol li::before {
    content: counter(step, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--color-bronze);
    align-self: start;
    padding-top: 2px;
}

/* Decorative geometric accent */
.hero-deco {
    position: absolute; pointer-events: none; opacity: .5;
    right: -60px; top: -60px; width: 280px; height: 280px;
}
.hero-deco circle, .hero-deco line { stroke: var(--color-rule-strong); fill: none; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 13px 22px;
    font-size: 0.92rem;
    letter-spacing: 0.04em;
    border: 1px solid var(--color-ink);
    background: var(--color-ink);
    color: #f6f3ee;
    border-radius: var(--radius);
    transition: transform .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}
.btn:hover { background: var(--color-teal-deep); border-color: var(--color-teal-deep); color: #fff; transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--color-ink); }
.btn--ghost:hover { background: var(--color-ink); color: #fff; }
.btn--bronze { background: var(--color-bronze); border-color: var(--color-bronze); color: #fff; }
.btn--bronze:hover { background: var(--color-teal-deep); border-color: var(--color-teal-deep); }
.btn .arrow { transition: transform .2s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- Section heading ---------- */
.section-head {
    display: grid; grid-template-columns: 1fr 2fr; gap: 32px;
    margin-bottom: 2.4rem;
    padding-bottom: 1.4rem;
    border-bottom: 1px solid var(--color-rule);
}
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; gap: 12px; } }
.section-head .label { font-family: var(--font-mono); font-size: .78rem; letter-spacing: .18em; text-transform: uppercase; color: var(--color-muted); }
.section-head h2 { margin: 0; }

/* ---------- Card grid ---------- */
.cards {
    display: grid; gap: 1px;
    background: var(--color-rule);
    border: 1px solid var(--color-rule);
    grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 760px) { .cards { grid-template-columns: 1fr; } }
.cards .card {
    background: var(--color-surface);
    padding: 28px;
    display: flex; flex-direction: column; gap: 10px;
    transition: background .25s var(--ease);
}
.cards .card:hover { background: var(--color-bg-alt); }
.card .num {
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--color-bronze);
    letter-spacing: .14em;
}
.card h3 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--color-ink-soft); }
.card .more {
    margin-top: auto;
    padding-top: 14px;
    font-size: 0.88rem;
    letter-spacing: .04em;
    display: inline-flex; align-items: center; gap: 8px;
}

/* ---------- Workflow ---------- */
.workflow {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    counter-reset: wf;
}
@media (max-width: 860px) { .workflow { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .workflow { grid-template-columns: 1fr; } }
.workflow .step {
    counter-increment: wf;
    border-top: 1px solid var(--color-ink);
    padding-top: 16px;
    position: relative;
}
.workflow .step::before {
    content: counter(wf, decimal-leading-zero);
    font-family: var(--font-mono); font-size: .78rem;
    color: var(--color-bronze); letter-spacing: .14em;
    margin-bottom: 8px; display: block;
}
.workflow .step h3 { font-family: var(--font-serif); font-size: 1.15rem; margin: 0 0 6px; }
.workflow .step p { font-size: .92rem; margin: 0; color: var(--color-ink-soft); }

/* ---------- Reference panel ---------- */
.reference-panel {
    display: grid; grid-template-columns: 1fr 1fr; gap: 0;
    border: 1px solid var(--color-rule);
    background: var(--color-surface);
}
@media (max-width: 760px) { .reference-panel { grid-template-columns: 1fr; } }
.reference-panel .col { padding: 32px; }
.reference-panel .col + .col { border-left: 1px solid var(--color-rule); }
@media (max-width: 760px) {
    .reference-panel .col + .col { border-left: none; border-top: 1px solid var(--color-rule); }
}
.reference-panel h3 { margin-top: 0; }
.reference-panel .domain {
    font-family: var(--font-mono);
    font-size: .92rem;
    background: var(--color-bg-alt);
    padding: 10px 14px;
    border: 1px solid var(--color-rule);
    display: inline-block;
    margin-top: 10px;
    color: var(--color-ink);
}

/* ---------- Article / documentation prose ---------- */
.prose {
    max-width: var(--container-narrow);
    margin: 0 auto;
}
.prose h2 { margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--color-rule); }
.prose h3 { margin-top: 1.6rem; }
.prose ul, .prose ol { color: var(--color-ink-soft); padding-left: 1.2rem; }
.prose ul li, .prose ol li { margin-bottom: .5em; }
.prose .note {
    background: var(--color-bg-alt);
    border-left: 2px solid var(--color-teal);
    padding: 16px 20px;
    margin: 1.4rem 0;
    font-size: .95rem;
}

/* ---------- Doc table of contents ---------- */
.doc-layout {
    display: grid; grid-template-columns: 240px 1fr;
    gap: 56px;
    align-items: start;
}
@media (max-width: 900px) { .doc-layout { grid-template-columns: 1fr; gap: 24px; } }
.toc {
    position: sticky; top: 100px;
    border-left: 1px solid var(--color-rule);
    padding-left: 18px;
    font-size: 0.9rem;
}
.toc h4 {
    font-family: var(--font-sans); font-size: .72rem; letter-spacing: .22em;
    text-transform: uppercase; color: var(--color-muted); margin: 0 0 12px;
}
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { margin-bottom: 8px; }
.toc a { color: var(--color-ink-soft); }
.toc a:hover { color: var(--color-teal); }

/* ---------- Forms ---------- */
.form-card {
    background: var(--color-surface);
    border: 1px solid var(--color-rule);
    padding: clamp(24px, 4vw, 40px);
    box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; margin-bottom: 18px; }
.field label {
    font-size: .78rem; letter-spacing: .12em; text-transform: uppercase;
    color: var(--color-ink-soft); margin-bottom: 8px; font-weight: 600;
}
.field input, .field textarea, .field select {
    font-family: inherit; font-size: 1rem;
    padding: 12px 14px;
    background: var(--color-bg);
    border: 1px solid var(--color-rule-strong);
    color: var(--color-ink);
    border-radius: var(--radius);
    transition: border-color .2s var(--ease), background .2s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
    outline: none;
    border-color: var(--color-teal);
    background: var(--color-surface);
}
.field textarea { min-height: 140px; resize: vertical; }
.field .hint { font-size: .82rem; color: var(--color-muted); margin-top: 6px; }

.form-note {
    font-size: .9rem; color: var(--color-ink-soft);
    background: var(--color-bg-alt);
    padding: 14px 18px;
    border-left: 2px solid var(--color-bronze);
    margin-bottom: 24px;
}

/* ---------- Contact panel ---------- */
.contact-grid {
    display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px;
}
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-block {
    border: 1px solid var(--color-rule);
    background: var(--color-surface);
    padding: 32px;
}
.contact-block .label-tag {
    font-family: var(--font-mono); font-size: .72rem;
    letter-spacing: .16em; text-transform: uppercase;
    color: var(--color-bronze);
}
.contact-block .email-line {
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 2.5vw, 1.9rem);
    color: var(--color-teal);
    margin: 12px 0 4px;
    word-break: break-word;
}
.contact-block dl { display: grid; grid-template-columns: max-content 1fr; gap: 12px 24px; margin: 18px 0 0; }
.contact-block dt { font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--color-muted); }
.contact-block dd { margin: 0; color: var(--color-ink-soft); }

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-teal-deep);
    color: #d8cdb6;
    padding: 64px 0 24px;
    margin-top: 64px;
}
.site-footer a { color: #e9ddc6; }
.site-footer a:hover { color: #fff; }
.footer-grid {
    display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(217, 199, 162, 0.18);
}
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .brand-mark { background: transparent; border-color: rgba(217, 199, 162, 0.4); }
.footer-brand .brand-mark svg path,
.footer-brand .brand-mark svg circle { stroke: #e9ddc6; }
.footer-brand .brand-text .brand-name { color: #f3ead6; }
.footer-brand .brand-text .brand-sub { color: rgba(232, 217, 187, 0.7); }
.footer-brand p { color: rgba(232, 217, 187, 0.78); margin-top: 14px; max-width: 38ch; font-size: .92rem; }

.footer-col h4 {
    font-family: var(--font-sans);
    font-size: .72rem; letter-spacing: .22em; text-transform: uppercase;
    color: rgba(232, 217, 187, 0.72);
    margin: 0 0 14px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; font-size: .92rem; }

.footer-bar {
    display: flex; flex-wrap: wrap; gap: 12px;
    justify-content: space-between; align-items: center;
    padding-top: 22px;
    font-size: .8rem; color: rgba(232, 217, 187, 0.65);
}
.footer-bar .legal a { margin-left: 18px; }

/* ---------- Helpers ---------- */
.text-muted { color: var(--color-muted); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.last-updated {
    display: inline-flex; align-items: center; gap: 10px;
    font-family: var(--font-mono);
    font-size: .78rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--color-muted);
}
.last-updated::before {
    content: ""; width: 6px; height: 6px; background: var(--color-bronze);
    display: inline-block; border-radius: 50%;
}

/* ---------- Page header (interior pages) ---------- */
.page-header {
    padding: clamp(3rem, 6vw, 5rem) 0 clamp(2rem, 4vw, 3rem);
    border-bottom: 1px solid var(--color-rule);
    background:
        radial-gradient(circle at 90% 20%, rgba(31, 79, 74, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 10% 90%, rgba(138, 106, 59, 0.05) 0%, transparent 55%),
        var(--color-bg);
}
.page-header .breadcrumbs {
    font-family: var(--font-mono); font-size: .78rem; letter-spacing: .12em;
    color: var(--color-muted); margin-bottom: 1.4rem;
}
.page-header .breadcrumbs a { color: var(--color-muted); }
.page-header .breadcrumbs a:hover { color: var(--color-teal); }
.page-header h1 { max-width: 22ch; }
.page-header p.lede { max-width: 60ch; }

/* ---------- Print friendliness ---------- */
@media print {
    .site-header, .site-footer, .nav-toggle, .utility-bar, .hero-actions { display: none !important; }
    body { background: #fff; color: #000; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
    html { scroll-behavior: auto; }
}