/* ================================================================
   screen.css — web layout for lab.awalkaday.art
   Loaded on all pages EXCEPT /impression/
   Inspired by the Chiragan catalogue layout (Julie Blanc, 2020)
   ================================================================ */

/* ── Custom properties ────────────────────────────────────────── */
:root {
  --font-body:    "Georgia", "Times New Roman", serif;
  --font-ui:      system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono:    "Courier New", monospace;

  --color-bg:         #faf9f7;
  --color-surface:    #ffffff;
  --color-text:       #1a1a18;
  --color-text-muted: #6b6b65;
  --color-accent:     #2d5a8e;
  --color-accent-hover: #1e3f65;
  --color-border:     #e0ddd5;
  --color-nav-active: #2d5a8e;
  --color-nav-active-bg: #eef3fa;

  --sidebar-width: 260px;
  --content-max:   720px;
  --header-h:      52px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:         #18181a;
    --color-surface:    #222224;
    --color-text:       #e8e6e1;
    --color-text-muted: #8c8b85;
    --color-accent:     #7aaddf;
    --color-accent-hover: #a0c4eb;
    --color-border:     #333330;
    --color-nav-active: #7aaddf;
    --color-nav-active-bg: #1e2b38;
  }
}

/* ── Reset ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ── Site header ──────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-title {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--color-text);
  text-decoration: none;
}
.site-title:hover { color: var(--color-accent); }

.nav-print-link {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  transition: color 0.15s, border-color 0.15s;
}
.nav-print-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ── Body layout ──────────────────────────────────────────────── */
.layout-body {
  display: flex;
  min-height: calc(100vh - var(--header-h));
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 1.5rem 0;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
}

.nav-list {
  list-style: none;
}
.nav-list .nav-list {
  margin-left: 0.75rem;
}

.nav-item { }

.nav-link {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 0.35rem 1.25rem;
  border-left: 2px solid transparent;
  transition: color 0.1s, background 0.1s, border-color 0.1s;
}
.nav-link:hover {
  color: var(--color-text);
  background: var(--color-nav-active-bg);
}
.nav-link--active {
  color: var(--color-nav-active);
  border-left-color: var(--color-nav-active);
  background: var(--color-nav-active-bg);
  font-weight: 600;
}

/* ── Main content ─────────────────────────────────────────────── */
.content {
  flex: 1;
  min-width: 0;
  padding: 3rem 2rem 4rem;
}

.page-content {
  max-width: var(--content-max);
  margin: 0 auto;
}

/* ── Typography ───────────────────────────────────────────────── */
.page-title {
  font-family: var(--font-ui);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 2rem;
  color: var(--color-text);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-ui);
  font-weight: 600;
  line-height: 1.3;
  margin: 2rem 0 0.75rem;
  color: var(--color-text);
}
h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.4rem; }
h3 { font-size: 1.1rem; }

p { margin-bottom: 1.25rem; }

a { color: var(--color-accent); text-decoration: underline; text-decoration-thickness: 1px; }
a:hover { color: var(--color-accent-hover); }

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
  border-radius: 4px;
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-muted);
  font-style: italic;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-border);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}
pre code { background: none; padding: 0; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
th, td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}
th { background: var(--color-border); font-family: var(--font-ui); }

/* ── Page footer (pagination) ─────────────────────────────────── */
.page-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.page-pagination {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}
.pagination-prev, .pagination-next {
  color: var(--color-accent);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: border-color 0.15s, background 0.15s;
}
.pagination-prev:hover, .pagination-next:hover {
  background: var(--color-nav-active-bg);
  border-color: var(--color-accent);
}

/* ── Site footer ──────────────────────────────────────────────── */
.site-footer {
  padding: 1.5rem 2rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.site-footer a { color: var(--color-text-muted); }
.site-footer a:hover { color: var(--color-accent); }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .content { padding: 1.5rem 1rem 3rem; }
  .page-title { font-size: 1.5rem; }
}

/* ── Do not render when printing — print.css handles that ─────── */
@media print {
  .site-header, .sidebar, .page-footer, .site-footer { display: none; }
}

/* ── Hint / callout blocks ────────────────────────────────────── */
.hint {
  margin: 1.5rem 0;
  padding: 0.85rem 1.1rem;
  border-left: 3px solid var(--color-border);
  border-radius: 0 4px 4px 0;
  font-size: 0.93rem;
  line-height: 1.6;
}
.hint p:last-child { margin-bottom: 0; }

.hint-info    { border-left-color: var(--color-accent);  background: var(--color-nav-active-bg); }
.hint-warning { border-left-color: #b07d00; background: #fdf8e8; }
.hint-danger  { border-left-color: #b03000; background: #fdf0ee; }
.hint-success { border-left-color: #2a7a2a; background: #f0faf0; }

@media (prefers-color-scheme: dark) {
  .hint-warning { background: #2a2400; }
  .hint-danger  { background: #2a1400; }
  .hint-success { background: #0a2200; }
}

/* ── Arweave / media embeds ───────────────────────────────────── */
.embed-media {
  margin: 1.75rem 0;
  text-align: center;
}
.embed-media img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  display: block;
  margin: 0 auto 0.5rem;
}
.embed-media figcaption {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  word-break: break-all;
}
.embed-media figcaption a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.embed-media figcaption a:hover { color: var(--color-accent); }

/* ── External link cards ──────────────────────────────────────── */
.embed-link {
  margin: 1rem 0;
  padding: 0.65rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  background: var(--color-surface);
}
.embed-link a {
  color: var(--color-accent);
  word-break: break-all;
}

/* ── Titled code blocks ───────────────────────────────────────── */
/* The title comment sits directly above the fenced block.        */
/* No extra styling needed — inherits pre/code rules.             */

/* ── Tab blocks ───────────────────────────────────────────────── */
.tab {
  margin: 0.5rem 0 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}
.tab::before {
  display: block;
  content: attr(data-title);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}