/* Mapzimus "Quadrangle" design system.
   Fonts: Archivo (variable wght+wdth) and IBM Plex Mono — SIL OFL, self-hosted
   in /fonts/ because the site CSP only allows same-origin assets. */

@font-face {
  font-family: "Archivo";
  src: url("/fonts/archivo-var-latin.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/plex-mono-400-latin.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/plex-mono-600-latin.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}

/* Night chart is the default; the toggle stores "light" to opt into paper. */
:root {
  --paper: #121721;
  --card: #1a202b;
  --well: #161c26;
  --ink: #e9e4d6;
  --muted: #99a0a3;
  --line: #313a47;
  --line-soft: #262e3a;
  --grid: rgba(233, 228, 214, 0.055);
  --accent: #e0796e;            /* survey red, night-brightened */
  --c-maps: #6aa9dd;            /* hydrographic blue */
  --c-data: #c99a63;            /* contour brown */
  --c-design: #a891e8;          /* photorevision purple */
  --c-classroom: #7fb87a;       /* woodland green */
  --c-math: #e0796e;            /* survey red */
  --c-soccer: #dd9a52;          /* orange */
  --c-utilities: #99a0a3;       /* slate */
  --c-play: #d987b1;
  --c-experiments: #6dbdb4;
  --shadow: 0 14px 28px rgba(0, 0, 0, 0.45);
  --sans: "Archivo", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}

html[data-theme="light"] {
  --paper: #f5f1e6;
  --card: #fbf8f0;
  --well: #ede7d8;
  --ink: #20241f;
  --muted: #62665a;
  --line: #d5ccb6;
  --line-soft: #e4dcc8;
  --grid: rgba(32, 36, 31, 0.075);
  --accent: #b43a30;
  --c-maps: #22689f;
  --c-data: #8a5a28;
  --c-design: #6f56b8;
  --c-classroom: #3c7a38;
  --c-math: #b43a30;
  --c-soccer: #c1670f;
  --c-utilities: #62665a;
  --c-play: #b3437e;
  --c-experiments: #22766f;
  --shadow: 0 14px 28px rgba(46, 42, 30, 0.11);
}

/* ---- Base ---- */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 420;
  line-height: 1.6;
  overflow-x: clip;
}
a { color: inherit; }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent); color: var(--paper); }
.skip-link { position: absolute; left: -10000px; top: 8px; z-index: 20; background: var(--ink); color: var(--paper); padding: 10px 14px; }
.skip-link:focus { left: 8px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }

/* The "sheet": content sits inside hairline neatlines, like a map plate. */
.sheet { max-width: 1240px; margin: 0 auto; border-inline: 1px solid var(--line-soft); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
main, footer, .site-header { padding-inline: clamp(20px, 4vw, 44px); }

/* ---- Header ---- */

.site-header { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding-block: 18px; border-bottom: 1px solid var(--line); position: relative; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark { position: relative; display: grid; place-items: center; width: 36px; height: 36px; background: var(--ink); color: var(--paper); font: 600 12.5px var(--mono); letter-spacing: 0.02em; }
.brand-mark::after { content: ""; position: absolute; right: -3px; top: -3px; width: 7px; height: 7px; background: var(--accent); }
.brand-name { font-weight: 640; font-stretch: 88%; font-size: 1.06rem; letter-spacing: 0.01em; }

.site-nav { display: flex; align-items: center; gap: 4px 18px; flex-wrap: wrap; justify-content: flex-end; }
.site-nav a { font: 600 12px var(--mono); letter-spacing: 0.04em; text-transform: uppercase; text-decoration: none; color: var(--muted); padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover { color: var(--ink); border-bottom-color: var(--line); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.professional-link { border-left: 1px solid var(--line); padding-left: 18px; }

/* Desktop "More" menu for secondary sections (Notes, Radars, Skills, …). */
.nav-more { position: relative; }
.nav-more > summary {
  list-style: none; cursor: pointer;
  font: 600 12px var(--mono); letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--muted); padding: 4px 0; border-bottom: 2px solid transparent;
}
.nav-more > summary::-webkit-details-marker { display: none; }
.nav-more > summary::after { content: " ▾"; font-size: 0.85em; }
.nav-more:hover > summary, .nav-more[open] > summary, .nav-more.is-current > summary {
  color: var(--ink); border-bottom-color: var(--accent);
}
.nav-more-panel {
  position: absolute; right: 0; top: calc(100% + 10px); z-index: 12;
  min-width: 180px; display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--ink); box-shadow: var(--shadow);
}
.nav-more-panel a {
  font: 600 12px var(--mono); letter-spacing: 0.04em; text-transform: uppercase;
  text-decoration: none; color: var(--muted); padding: 11px 14px;
  border-bottom: 1px solid var(--line-soft);
}
.nav-more-panel a:last-child { border-bottom: 0; }
.nav-more-panel a:hover { color: var(--ink); background: var(--well); }
.nav-more-panel a[aria-current="page"] { color: var(--accent); }

.theme-toggle { width: 34px; height: 34px; border: 1px solid var(--line); background: var(--card); cursor: pointer; display: grid; place-items: center; padding: 0; }
.theme-toggle:hover { border-color: var(--ink); }
.theme-toggle svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; }
html[data-theme="light"] .theme-toggle .moon { display: none; }
html:not([data-theme="light"]) .theme-toggle .sun { display: none; }

/* Mobile menu: <details>, works without JavaScript. */
.menu { display: none; position: relative; }
.menu > summary { list-style: none; cursor: pointer; font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; border: 1px solid var(--line); background: var(--card); padding: 8px 12px; }
.menu > summary::-webkit-details-marker { display: none; }
.menu[open] > summary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.menu-panel { position: absolute; right: 0; top: calc(100% + 8px); z-index: 10; min-width: 220px; display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--ink); box-shadow: var(--shadow); }
.menu-panel a { font: 600 13px var(--mono); text-transform: uppercase; letter-spacing: 0.05em; text-decoration: none; padding: 12px 16px; border-bottom: 1px solid var(--line-soft); }
.menu-panel a:last-child { border-bottom: 0; }
.menu-panel a[aria-current="page"] { color: var(--accent); }
.menu-panel a:hover { background: var(--well); }

/* ---- Hero: graticule panel with corner coordinates ---- */

.hero { position: relative; padding: clamp(56px, 9vw, 96px) 0 clamp(48px, 7vw, 80px); border-bottom: 1px solid var(--line); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, var(--grid) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(to bottom, var(--grid) 0 1px, transparent 1px 88px);
  mask-image: linear-gradient(to bottom, #000 40%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, #000 40%, transparent);
}
.coord { position: absolute; font: 400 10.5px var(--mono); letter-spacing: 0.08em; color: var(--muted); }
.coord-ne { top: 14px; right: 0; }
.coord-sw { bottom: 12px; left: 0; }

.eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; color: var(--muted); font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: 0.14em; }
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--accent); }

h1, h2, h3 { margin: 0; line-height: 1.02; letter-spacing: -0.015em; font-stretch: 76%; font-weight: 760; }
h1 { position: relative; max-width: 900px; font-size: clamp(2.7rem, 7vw, 5.6rem); text-wrap: balance; }
.hero > p { position: relative; max-width: 640px; margin: 22px 0 0; color: var(--muted); font-size: clamp(1.02rem, 1.8vw, 1.22rem); text-wrap: pretty; }
.hero a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 3px; }

.hero-actions { position: relative; display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero-cta {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 10px 18px; text-decoration: none;
  font: 600 12px var(--mono); letter-spacing: 0.05em; text-transform: uppercase;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  transition: transform 0.16s ease, background 0.16s ease, color 0.16s ease;
}
.hero-cta:hover { transform: translateY(-1px); }
.hero-cta.quiet { background: transparent; color: var(--ink); }
.hero-cta.quiet:hover { background: var(--card); }

.trust-row { position: relative; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.trust-row span { border: 1px solid var(--line); background: var(--card); padding: 6px 11px; font: 600 11.5px var(--mono); letter-spacing: 0.03em; }

/* Staggered load-in for hero content. */
.hero .eyebrow, .hero h1, .hero > p, .hero .hero-actions, .hero .trust-row { animation: rise 0.5s cubic-bezier(0.2, 0.7, 0.3, 1) backwards; }
.hero h1 { animation-delay: 0.06s; }
.hero > p { animation-delay: 0.12s; }
.hero .hero-actions { animation-delay: 0.16s; }
.hero .trust-row { animation-delay: 0.2s; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

/* ---- Sections ---- */

/* Section shells only — .card.featured must not inherit this padding. */
section.featured, section.catalog { padding: clamp(48px, 6vw, 70px) 0; }
section.catalog { border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 26px; }
.section-heading h2 { font-size: clamp(1.7rem, 3.4vw, 2.7rem); }
.section-heading p { max-width: 400px; color: var(--muted); margin: 0; font-size: 0.95rem; }

.featured-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.catalog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(272px, 1fr)); gap: 14px; }
[hidden] { display: none !important; }

/* ---- Grouped browse shelves (Tools / Maps / Lab) ---- */
.cat-group { margin-bottom: clamp(30px, 4vw, 46px); }
.cat-group:last-child { margin-bottom: 0; }
.group-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; padding-bottom: 9px; border-bottom: 1px solid var(--line); }
.group-head h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); font-stretch: 82%; font-weight: 680; letter-spacing: -0.01em; }
.group-count { font: 600 12px var(--mono); color: var(--muted); }

/* ---- Home: browse-by-section doors ---- */
.section-cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.section-card { --cat: var(--muted); position: relative; display: flex; flex-direction: column; min-height: 200px; padding: 24px; background: var(--card); border: 1px solid var(--line); border-top: 3px double var(--cat); text-decoration: none; transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease; }
.section-card:hover { transform: translateY(-2px); border-color: var(--ink); box-shadow: var(--shadow); }
.section-card[data-category="maps"] { --cat: var(--c-maps); }
.section-card[data-category="data"] { --cat: var(--c-data); }
.section-card[data-category="play"] { --cat: var(--c-play); }
.section-card[data-category="experiments"] { --cat: var(--c-experiments); }
.section-card h3 { font-size: 1.6rem; font-stretch: 82%; font-weight: 720; margin-bottom: 8px; }
.section-card .card-copy { flex: 1; margin-bottom: 16px; }
.section-card:hover h3 { text-decoration: underline; text-decoration-color: var(--cat); text-decoration-thickness: 2px; text-underline-offset: 4px; }

/* ---- Cards ---- */
/* Category color arrives through --cat, set by data-category below. */

.card { --cat: var(--muted); position: relative; display: flex; flex-direction: column; min-width: 0; background: var(--card); border: 1px solid var(--line); transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease; }
.card:hover { transform: translateY(-2px); border-color: var(--ink); box-shadow: var(--shadow); }
.card[data-category="maps"] { --cat: var(--c-maps); }
.card[data-category="data"] { --cat: var(--c-data); }
.card[data-category="design"] { --cat: var(--c-design); }
.card[data-category="classroom"] { --cat: var(--c-classroom); }
.card[data-category="math"] { --cat: var(--c-math); }
.card[data-category="soccer"] { --cat: var(--c-soccer); }
.card[data-category="utilities"] { --cat: var(--c-utilities); }
.card[data-category="teaching"] { --cat: var(--c-classroom); }
.card[data-category="fun"] { --cat: var(--c-utilities); }
.card[data-category="play"] { --cat: var(--c-play); }
.card[data-category="experiments"] { --cat: var(--c-experiments); }

.card-link { display: flex; flex-direction: column; flex: 1; padding: 18px; text-decoration: none; }
.card-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 13px; padding-right: 34px; }
.cat-tick { width: 9px; height: 9px; background: var(--cat); flex: none; }
.card-type { color: var(--cat); font: 600 10.5px var(--mono); text-transform: uppercase; letter-spacing: 0.1em; }
.card-icon { margin-left: auto; font-size: 1.25rem; line-height: 1; filter: saturate(0.85); }
.card h3 { font-size: 1.16rem; font-stretch: 84%; font-weight: 660; letter-spacing: -0.005em; }
.card-link:hover h3 { text-decoration: underline; text-decoration-color: var(--cat); text-decoration-thickness: 2px; text-underline-offset: 4px; }
.card-copy { color: var(--muted); font-size: 0.89rem; line-height: 1.55; margin: 8px 0 16px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 14px; }
.tag { background: var(--well); color: var(--muted); padding: 2px 7px; font: 400 10.5px var(--mono); }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: auto; font: 600 11px var(--mono); letter-spacing: 0.04em; }
.status { color: var(--cat); text-transform: uppercase; }
.open-cue { color: var(--muted); }
.card:hover .open-cue { color: var(--ink); }

.card.featured { border-top: 3px double var(--cat); }
.card.featured .card-link { padding: 22px; min-height: 240px; }
.card.featured h3 { font-size: 1.42rem; }
.card.featured .card-copy { font-size: 0.93rem; }

/* Cards fade in as a plate being printed; capped stagger. */
.catalog-grid .card, .featured-grid .card { animation: rise 0.4s ease backwards; }
.featured-grid .card:nth-child(2), .catalog-grid .card:nth-child(4n+2) { animation-delay: 0.05s; }
.featured-grid .card:nth-child(3), .catalog-grid .card:nth-child(4n+3) { animation-delay: 0.1s; }
.featured-grid .card:nth-child(4), .catalog-grid .card:nth-child(4n+4) { animation-delay: 0.15s; }

.star { position: absolute; right: 8px; top: 8px; z-index: 2; width: 30px; height: 30px; border: 1px solid transparent; background: transparent; color: var(--muted); cursor: pointer; font-size: 0.95rem; line-height: 1; }
.star:hover { border-color: var(--line); color: var(--ink); }
.star[aria-pressed="true"] { color: var(--accent); }

/* ---- Catalog controls ---- */

.catalog-controls { display: grid; grid-template-columns: minmax(240px, 1fr) auto auto; gap: 10px 14px; align-items: start; margin-bottom: 26px; }
.search-field { position: relative; display: block; }
.search-field input { width: 100%; min-height: 44px; border: 1px solid var(--line); background: var(--card); padding: 10px 44px 10px 13px; font-size: 0.95rem; }
.search-field input:focus { border-color: var(--ink); outline-offset: 0; }
.search-field input::placeholder { color: var(--muted); }
.search-field kbd { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); border: 1px solid var(--line); background: var(--well); color: var(--muted); padding: 1px 7px; font: 600 11px var(--mono); pointer-events: none; }
.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.filter, .quiet-button { min-height: 44px; border: 1px solid var(--line); background: var(--card); padding: 8px 12px; cursor: pointer; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.filter:hover, .quiet-button:hover { border-color: var(--ink); color: var(--ink); }
.filter[aria-pressed="true"], .quiet-button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.empty { border: 1px dashed var(--line); padding: 28px; color: var(--muted); text-align: center; }

/* ---- Footer: the map collar ---- */

footer { border-top: 3px double var(--line); padding-block: 30px 44px; display: flex; justify-content: space-between; align-items: start; gap: 24px; color: var(--muted); font-size: 0.9rem; }
.footer-main { display: flex; flex-direction: column; gap: 14px; max-width: 52ch; }
.footer-main p { margin: 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.footer-nav a {
  font: 600 11px var(--mono); letter-spacing: 0.05em; text-transform: uppercase;
  text-decoration: none; color: var(--muted); border-bottom: 1px solid transparent;
}
.footer-nav a:hover { color: var(--ink); border-bottom-color: var(--accent); }
footer a { text-decoration-color: var(--accent); text-underline-offset: 3px; }
footer a:hover { color: var(--ink); }
.footer-note { font: 400 11px var(--mono); letter-spacing: 0.03em; max-width: 46ch; text-align: right; }

/* ---- Prose pages (about, notes) ---- */

.prose { max-width: 720px; padding: clamp(40px, 6vw, 64px) 0; }
.prose p { margin: 0 0 18px; font-size: 1.03rem; }
.prose a { text-decoration-color: var(--accent); text-underline-offset: 3px; }

/* ---- Responsive ---- */

@media (max-width: 1300px) { .sheet { border-inline: 0; } }
@media (max-width: 980px) {
  .featured-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .catalog-controls { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .site-nav { display: none; }
  .menu { display: block; }
  .featured-grid { grid-template-columns: 1fr; }
  .section-cards { grid-template-columns: 1fr; }
  .section-heading { flex-direction: column; align-items: flex-start; gap: 8px; }
  footer { flex-direction: column; }
  .footer-note { text-align: left; }
  .coord-ne { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero .eyebrow, .hero h1, .hero > p, .hero .hero-actions, .hero .trust-row, .catalog-grid .card, .featured-grid .card { animation: none; }
  .card, .card:hover, .hero-cta, .hero-cta:hover { transition: none; transform: none; }
}