/* ─────────────────────────────────────────────────────────────────────────
   Civilization101 Blueprint — tokens, shell, shared components.
   Archival-paper palette: warm ground, ink text, ember accent, tier hues.
   ───────────────────────────────────────────────────────────────────────── */

:root {
  --bg:       #F7F4EE;
  --bg-2:     #FCFAF6;
  --paper:    #FFFDF9;
  --ink:      #17140F;
  --body:     #3D372E;
  --muted:    #7A7264;
  --subtle:   #A79D8D;
  --hairline: #E9E2D6;
  --divider:  #F1ECE2;

  --ember:      #B4531F;
  --ember-2:    #8E3F16;
  --ember-soft: #FBE8DA;

  --green: #2F6B43;  --green-soft: #E2F0E5;
  --red:   #A8302B;  --red-soft:   #FAE4E2;
  --amber: #9A6B08;  --amber-soft: #FBEFD6;
  --blue:  #27548A;  --blue-soft:  #E4EDF8;

  /* Tier hues — used by chips, rails, graph nodes, ladder spine. */
  --t0: #A8302B;  --t0-soft: #FAE4E2;
  --t1: #2F6B43;  --t1-soft: #E2F0E5;
  --t2: #8A5A22;  --t2-soft: #F6EBD9;
  --t3: #27548A;  --t3-soft: #E4EDF8;
  --t4: #4A4E57;  --t4-soft: #EAEBEE;
  --t5: #9A6B08;  --t5-soft: #FBEFD6;
  --t6: #5C3A87;  --t6-soft: #EEE8F7;
  --t7: #1C6B6B;  --t7-soft: #DEF0EF;

  --r-sm: 8px; --r-md: 13px; --r-lg: 20px; --r-xl: 28px;

  --shadow-sm: 0 1px 2px rgba(23,20,15,.05), 0 1px 3px rgba(23,20,15,.05);
  --shadow-md: 0 6px 18px rgba(23,20,15,.06), 0 2px 6px rgba(23,20,15,.04);
  --shadow-lg: 0 24px 52px rgba(23,20,15,.11), 0 6px 14px rgba(23,20,15,.05);

  --nav-h: 60px;
  --serif: Fraunces, Georgia, "Times New Roman", serif;
  --sans: Inter, system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

html[data-theme="dark"] {
  --bg:       #14120E;
  --bg-2:     #191712;
  --paper:    #1E1B16;
  --ink:      #F4F0E8;
  --body:     #C9C2B4;
  --muted:    #918878;
  --subtle:   #6B6355;
  --hairline: #2E2A23;
  --divider:  #262219;

  --ember:      #E0793F;
  --ember-2:    #F0975F;
  --ember-soft: #3A2317;

  --green: #6FBF8B; --green-soft: #1B2E22;
  --red:   #E4736C; --red-soft:   #331D1C;
  --amber: #D9A63C; --amber-soft: #322613;
  --blue:  #6FA3DC; --blue-soft:  #17263A;

  --t0: #E4736C; --t0-soft: #331D1C;
  --t1: #6FBF8B; --t1-soft: #1B2E22;
  --t2: #D0A05C; --t2-soft: #322715;
  --t3: #6FA3DC; --t3-soft: #17263A;
  --t4: #A2A8B4; --t4-soft: #22252A;
  --t5: #D9A63C; --t5-soft: #322613;
  --t6: #AE8FDD; --t6-soft: #241C33;
  --t7: #57BDB6; --t7-soft: #122E2C;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 6px 18px rgba(0,0,0,.45);
  --shadow-lg: 0 24px 52px rgba(0,0,0,.55);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }
body {
  background: var(--bg); color: var(--body);
  font-family: var(--sans); font-size: 15px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; min-height: 100vh; overflow-x: clip;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
img { display: block; max-width: 100%; }
/* Icons are inline <svg> with a viewBox and no width/height; unstyled they fall
   back to the replaced-element default of 300x150 and blow out their container.
   This is the floor — every component rule below is more specific. */
svg { width: 1em; height: 1em; flex-shrink: 0; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
::selection { background: var(--ember-soft); color: var(--ink); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 780px; margin: 0 auto; padding: 0 24px; }
.wrap-mid { max-width: 980px; margin: 0 auto; padding: 0 24px; }
.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; }
.hidden, [hidden] { display: none !important; }
.skip { position: absolute; left: -9999px; top: 0; z-index: 200; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 0 0 var(--r-sm) 0; }
.skip:focus { left: 0; }

/* ── Top navigation ───────────────────────────────────────────────────── */
.topnav {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: saturate(1.6) blur(16px);
  -webkit-backdrop-filter: saturate(1.6) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
.topnav-inner { max-width: 1180px; margin: 0 auto; padding: 10px 24px; display: flex; align-items: center; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); flex-shrink: 0; }
.brand-mark {
  width: 30px; height: 30px; display: grid; place-items: center; flex-shrink: 0;
  background: var(--ember); color: #fff; border-radius: 9px; font-size: 17px;
}
.brand-word { font-family: var(--serif); font-weight: 900; font-size: 16.5px; letter-spacing: -.02em; line-height: 1.05; display: flex; flex-direction: column; }
.brand-word em { font-style: normal; font-weight: 600; font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.nav-spacer { flex: 1; }
.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-links a {
  padding: 7px 12px; border-radius: 999px; font-size: 13.5px; font-weight: 600; color: var(--muted);
  transition: background .15s, color .15s; white-space: nowrap;
}
.nav-links a:hover { background: var(--divider); color: var(--ink); }
.nav-links a[aria-current="page"] { background: var(--ember-soft); color: var(--ember-2); }
.icon-btn {
  width: 34px; height: 34px; display: grid; place-items: center; border-radius: 999px;
  color: var(--muted); font-size: 16px; border: 1px solid var(--hairline); background: var(--paper);
}
.icon-btn:hover { color: var(--ink); border-color: var(--subtle); }

.subnav { border-top: 1px solid var(--hairline); background: var(--bg-2); }
.subnav-inner { max-width: 1180px; margin: 0 auto; padding: 8px 24px; display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.subnav-inner::-webkit-scrollbar { display: none; }

/* ── Typography ───────────────────────────────────────────────────────── */
h1, h2, h3, h4 { color: var(--ink); font-family: var(--serif); letter-spacing: -.02em; line-height: 1.15; font-weight: 700; }
.h-display { font-size: clamp(34px, 6vw, 58px); font-weight: 900; letter-spacing: -.035em; line-height: 1.02; }
.h-page { font-size: clamp(28px, 4vw, 40px); font-weight: 900; letter-spacing: -.03em; }
.h-sec { font-size: clamp(21px, 2.6vw, 27px); font-weight: 800; }
.h-sub { font-size: 17px; font-weight: 700; }
.lede { font-size: clamp(16.5px, 2vw, 19.5px); line-height: 1.62; color: var(--body); }
.eyebrow { font-size: 11.5px; font-weight: 800; letter-spacing: .17em; text-transform: uppercase; color: var(--ember); }
.prose p { margin-bottom: 15px; }
.prose > *:last-child { margin-bottom: 0; }
.prose ul, .prose ol { margin: 0 0 15px 21px; }
.prose li { margin-bottom: 7px; }
.prose strong { color: var(--ink); font-weight: 700; }
.prose a { color: var(--ember-2); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.prose a:hover { color: var(--ember); }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--divider); padding: 1px 5px; border-radius: 5px; color: var(--ink); }
.prose h3 { margin: 26px 0 10px; font-size: 19px; }
.prose h4 { margin: 20px 0 8px; font-size: 16px; }
.prose blockquote {
  margin: 0 0 15px; padding: 2px 0 2px 18px; border-left: 3px solid var(--ember);
  color: var(--muted); font-style: italic;
}
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* ── Cards, chips, buttons ────────────────────────────────────────────── */
.card {
  background: var(--paper); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); padding: 22px; box-shadow: var(--shadow-sm);
}
.card-tight { padding: 16px; border-radius: var(--r-md); }
a.card { display: block; transition: transform .16s, box-shadow .16s, border-color .16s; }
a.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--subtle); }

.chip {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px;
  font-size: 11.5px; font-weight: 700; background: var(--divider); color: var(--muted); white-space: nowrap;
}
.chip-t { background: var(--tier-soft, var(--divider)); color: var(--tier, var(--muted)); }
.chip-ember { background: var(--ember-soft); color: var(--ember-2); }
.chip-green { background: var(--green-soft); color: var(--green); }
.chip-red { background: var(--red-soft); color: var(--red); }
.chip-amber { background: var(--amber-soft); color: var(--amber); }
.chip-blue { background: var(--blue-soft); color: var(--blue); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px; font-weight: 700; font-size: 14px;
  background: var(--ember); color: #fff; border: 1px solid transparent;
  transition: background .15s, transform .12s; white-space: nowrap;
}
.btn:hover { background: var(--ember-2); }
.btn:active { transform: scale(.985); }
.btn-ghost { background: var(--paper); color: var(--ink); border-color: var(--hairline); }
.btn-ghost:hover { background: var(--divider); border-color: var(--subtle); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.filter-btn {
  padding: 6px 13px; border-radius: 999px; font-size: 13px; font-weight: 600;
  border: 1px solid var(--hairline); background: var(--paper); color: var(--muted); white-space: nowrap;
}
.filter-btn:hover { border-color: var(--subtle); color: var(--ink); }
.filter-btn[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.field {
  width: 100%; padding: 11px 15px; border-radius: var(--r-md);
  border: 1px solid var(--hairline); background: var(--paper); color: var(--ink); font-size: 14.5px;
}
.field:focus { outline: 2px solid var(--ember); outline-offset: -1px; border-color: transparent; }
.field::placeholder { color: var(--subtle); }

/* ── Layout helpers ───────────────────────────────────────────────────── */
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.stack { display: flex; flex-direction: column; }
.sec { padding: 56px 0; }
.sec-tight { padding: 34px 0; }
.rule { height: 1px; background: var(--hairline); border: 0; margin: 0; }

/* ── States ───────────────────────────────────────────────────────────── */
.state { text-align: center; padding: 60px 24px; color: var(--muted); }
.state-icon { font-size: 34px; margin-bottom: 12px; opacity: .55; }
.state h3 { margin-bottom: 6px; }
.spinner {
  width: 26px; height: 26px; border-radius: 50%; margin: 0 auto 12px;
  border: 2.5px solid var(--hairline); border-top-color: var(--ember);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.skel { background: linear-gradient(90deg, var(--divider) 25%, var(--hairline) 50%, var(--divider) 75%); background-size: 200% 100%; animation: sh 1.3s infinite; border-radius: var(--r-md); }
@keyframes sh { to { background-position: -200% 0; } }

/* ── Toasts ───────────────────────────────────────────────────────────── */
#toasts { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast {
  background: var(--ink); color: var(--bg); padding: 11px 18px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600; box-shadow: var(--shadow-lg); animation: rise .22s ease-out;
}
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }

/* ── Footer ───────────────────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--hairline); background: var(--bg-2); margin-top: 70px; padding: 40px 0 56px; }
.foot-grid { display: flex; gap: 40px; justify-content: space-between; flex-wrap: wrap; }
.foot-brand { font-family: var(--serif); font-weight: 900; color: var(--ink); font-size: 17px; margin-bottom: 6px; }
.foot-note { color: var(--muted); font-size: 13.5px; max-width: 330px; }
.f-links { display: grid; grid-template-columns: repeat(2, auto); gap: 8px 34px; align-content: start; }
.f-links a { color: var(--muted); font-size: 13.5px; font-weight: 600; }
.f-links a:hover { color: var(--ember-2); }

@media (max-width: 900px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .topnav-inner { padding: 9px 16px; gap: 10px; flex-wrap: wrap; }
  .nav-links { order: 3; width: 100%; overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; padding-bottom: 2px; }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-spacer { display: none; }
  .wrap, .wrap-narrow, .wrap-mid { padding: 0 16px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .sec { padding: 38px 0; }
}