/* Librarium: a quiet reading-room page; each library card wears its own site's colours and lettering. */
:root {
  --ground: #EEEBE4; --paper: #F8F6F1; --ink: #1B1A17; --muted: #5F5A52; --line: #D5CFC3; --gold: #8F6200;
  --f-mark: "Cormorant Garamond", Garamond, Georgia, serif;
  --f-body: "Newsreader", "Iowan Old Style", Georgia, serif;
  --f-data: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --ground: #0F0E0C; --paper: #181613; --ink: #ECE7DD; --muted: #A39C90; --line: #2C2924; --gold: #E2B85A; color-scheme: dark; }
}
:root[data-theme="dark"] { --ground: #0F0E0C; --paper: #181613; --ink: #ECE7DD; --muted: #A39C90; --line: #2C2924; --gold: #E2B85A; color-scheme: dark; }

/* One language at a time: every text exists in French and English. */
html[lang="fr"] .en, html[lang="en"] .fr { display: none; }

* { box-sizing: border-box; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 17px/1.55 var(--f-body); -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { max-width: 1120px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }

/* Top bar */
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 18px; padding-bottom: 18px; }
.mark { font: 600 15px var(--f-mark); letter-spacing: .32em; text-transform: uppercase; color: var(--muted); }
.ctl { display: flex; align-items: center; gap: 10px; }
.motion-btn { border: 0; background: none; padding: 4px 2px; font: 12px var(--f-data); color: var(--muted); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line); }
.motion-btn:hover { color: var(--ink); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.seg button { border: 0; background: none; padding: 5px 10px; font: 500 12px var(--f-data); color: var(--muted); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--ground); }

/* Introduction */
.intro { padding-top: 40px; padding-bottom: 36px; max-width: 760px; margin-left: max(0px, calc((100% - 1120px) / 2)); }
.intro h1 { margin: 0; font: 600 clamp(52px, 10vw, 104px)/.95 var(--f-mark); letter-spacing: .02em; }
.tagline { margin: 14px 0 0; font: italic 400 clamp(20px, 3vw, 26px)/1.3 var(--f-body); color: var(--gold); }
.lede { margin: 18px 0 0; color: var(--muted); max-width: 62ch; }

/* The four libraries */
.libs { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.lib-link {
  position: relative; display: block; height: 100%; overflow: hidden; text-decoration: none;
  background: var(--l-paper); color: var(--l-ink); border: 1px solid var(--l-line); border-radius: 4px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.lib-link:hover { transform: translateY(-2px); border-color: var(--l-accent); box-shadow: 0 10px 30px -18px rgba(0, 0, 0, .45); }
.motif { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.lib-body { position: relative; display: flex; flex-direction: column; gap: 6px; min-height: 340px; padding: 26px 26px 22px; }
.lib-world { font: 500 11px var(--f-data); letter-spacing: .16em; text-transform: uppercase; color: var(--l-accent); }
.lib-author { font: var(--l-weight, 400) clamp(26px, 3.4vw, 36px)/1.1 var(--l-font); letter-spacing: var(--l-track, .01em); text-transform: var(--l-case, none); margin-top: 4px; }
.lib-life { font: 12px var(--f-data); color: var(--l-muted); }
.lib-lede { margin-top: 10px; font-size: 16px; line-height: 1.5; max-width: 52ch; color: var(--l-ink); }
.lib-foot { margin-top: auto; padding-top: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; align-items: baseline; font: 12px var(--f-data); color: var(--l-muted); }
.lib-host { color: var(--l-accent); font-weight: 500; }
.lib-link:hover .lib-host span { margin-left: 4px; }

/* Each card borrows its site's palette (light, then dark). */
.lib-herbert { --l-paper: #F6F7FA; --l-ink: #171A26; --l-muted: #565B6E; --l-line: #CACED9; --l-contour: #C3C9D6; --l-accent: #A3470F; --l-font: "Michroma", sans-serif; --l-case: uppercase; --l-track: .02em; }
.lib-asimov { --l-paper: #F7F8FB; --l-ink: #141826; --l-muted: #535A6E; --l-line: #C9CED9; --l-contour: #C2C9D8; --l-accent: #1F6A86; --l-font: "Oxanium", sans-serif; --l-weight: 600; --l-case: uppercase; }
.lib-tolkien { --l-paper: #FAF6EC; --l-ink: #231C12; --l-muted: #62574A; --l-line: #D6CCB6; --l-contour: #D7CAAE; --l-accent: #2F5D3A; --l-font: "Cinzel", serif; --l-weight: 500; }
.lib-sanderson { --l-paper: #F6F7F9; --l-ink: #151922; --l-muted: #525A69; --l-line: #C8CDD7; --l-contour: #C4CAD6; --l-accent: #2346A0; --l-font: "Marcellus", serif; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .lib-herbert { --l-paper: #151826; --l-ink: #E7E4DC; --l-muted: #9A9EB0; --l-line: #2A2F42; --l-contour: #2C3450; --l-accent: #EF9552; }
  :root:not([data-theme="light"]) .lib-asimov { --l-paper: #121828; --l-ink: #E4E6EC; --l-muted: #98A0B4; --l-line: #263045; --l-contour: #2E3D60; --l-accent: #7FD3E6; }
  :root:not([data-theme="light"]) .lib-tolkien { --l-paper: #1D1912; --l-ink: #EAE2D0; --l-muted: #A99E8A; --l-line: #3A3226; --l-contour: #3A3224; --l-accent: #8CC79A; }
  :root:not([data-theme="light"]) .lib-sanderson { --l-paper: #141921; --l-ink: #E3E6EB; --l-muted: #99A1AE; --l-line: #28303D; --l-contour: #2A3444; --l-accent: #8FB0FF; }
}

/* How it works */
.how { padding-top: 56px; padding-bottom: 24px; }
.how h2 { margin: 0 0 18px; font: 600 28px var(--f-mark); }
.how ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.how h3 { margin: 0 0 6px; font: 500 12px var(--f-data); letter-spacing: .14em; text-transform: uppercase; color: var(--gold); }
.how p { margin: 0; color: var(--muted); font-size: 16px; }

footer { padding-top: 32px; padding-bottom: 40px; margin-top: 40px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
footer p { margin: 0; }
footer .ver { margin-top: 8px; font: 11px var(--f-data); opacity: .6; }

@media (max-width: 760px) {
  .libs, .how ul { grid-template-columns: minmax(0, 1fr); }
  .lib-body { min-height: 0; padding: 22px 20px 18px; }
  .intro { padding-top: 20px; }
  .motion-btn { display: none; }
}
@media (prefers-reduced-motion: reduce) { .lib-link { transition: none; } .lib-link:hover { transform: none; } }