/* =============================================================
   U.S. Citizenship Guide — Design System
   A clean, document-inspired aesthetic: deep navy, parchment
   warmth, restrained red accent. Built mobile-first.
   ============================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* Brand */
  --navy-900: #0a1f3c;
  --navy-800: #0e2a4f;
  --navy-700: #143562;
  --navy-600: #1d4685;
  --navy-500: #2f5da3;
  --navy-100: #e3ebf6;
  --navy-50:  #f1f5fb;

  --red-600: #b4232c;
  --red-500: #cf3a3a;
  --red-50:  #fbeceb;

  --gold-600: #9a7022;
  --gold-500: #c08a2d;
  --gold-100: #f6ecd4;
  --gold-50:  #fbf6ea;

  --green-600: #1f7a4d;
  --green-50:  #e7f4ec;

  /* Neutrals */
  --ink-900: #14202e;
  --ink-700: #33414f;
  --ink-500: #5b6875;
  --ink-400: #7c8896;
  --line:    #e2e6ec;
  --line-strong: #cfd6df;
  --paper:   #ffffff;
  --paper-2: #f7f5f0;   /* warm parchment */
  --paper-3: #fbfaf6;
  --bg:      #f4f2ec;

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;

  /* Radius & shadow */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 30px;
  --shadow-sm: 0 1px 2px rgba(16,32,54,.06), 0 1px 3px rgba(16,32,54,.08);
  --shadow-md: 0 4px 14px rgba(16,32,54,.08), 0 2px 6px rgba(16,32,54,.06);
  --shadow-lg: 0 18px 50px rgba(10,31,60,.16), 0 6px 18px rgba(10,31,60,.10);

  /* Layout */
  --max: 1180px;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 68px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 18px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink-900);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--navy-600); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 600; line-height: 1.15; color: var(--navy-900); letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin: 0 0 .5em; }
h3 { font-size: 1.25rem; margin: 0 0 .4em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin: .3em 0; }
strong { color: var(--navy-900); font-weight: 650; }
small { font-size: .82rem; }
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .9em; background: var(--navy-50); padding: .1em .4em; border-radius: 6px; color: var(--navy-700); }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
:focus-visible { outline: 3px solid var(--navy-500); outline-offset: 2px; border-radius: 4px; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.wrap-narrow { max-width: 860px; }
.section { padding-block: clamp(48px, 7vw, 92px); }
.section--tight { padding-block: clamp(36px, 5vw, 60px); }
.section--alt { background: var(--paper-2); border-block: 1px solid var(--line); }
.section--ink { background: var(--navy-900); color: #dce6f3; }
.section--ink h2, .section--ink h3 { color: #fff; }
.center { text-align: center; }
.lead { font-size: 1.18rem; color: var(--ink-700); max-width: 62ch; }
.eyebrow { display: inline-flex; align-items: center; gap: .5em; font-family: var(--font-sans); font-weight: 600; font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--red-600); margin: 0 0 .8em; }
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--red-500); display: inline-block; }
.section--ink .eyebrow { color: var(--gold-500); }
.section--ink .lead { color: #b7c6db; }
.muted { color: var(--ink-500); }
.grid { display: grid; gap: clamp(16px, 2.4vw, 26px); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }
@media (min-width: 861px) and (max-width: 1040px) { .cols-4 { grid-template-columns: repeat(2,1fr); } .cols-3 { grid-template-columns: repeat(2,1fr); } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55em;
  font-family: var(--font-sans); font-weight: 600; font-size: .98rem;
  padding: .78em 1.4em; border-radius: 100px; border: 1.5px solid transparent;
  cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s; text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--navy-700); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { background: var(--navy-800); box-shadow: var(--shadow-lg); }
.btn-accent { background: var(--red-600); color: #fff; box-shadow: var(--shadow-md); }
.btn-accent:hover { background: var(--red-500); }
.btn-ghost { background: transparent; color: var(--navy-700); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--navy-500); background: var(--navy-50); }
.btn-light { background: #fff; color: var(--navy-800); }
.btn-light:hover { background: var(--navy-50); }
.btn-sm { padding: .5em 1em; font-size: .88rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.86); backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 18px; }
.brand { display: flex; align-items: center; gap: .65em; font-family: var(--font-serif); font-weight: 600; font-size: 1.06rem; color: var(--navy-900); }
.brand:hover { text-decoration: none; }
.brand .crest {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(150deg, var(--navy-700), var(--navy-900));
  display: grid; place-items: center; color: #fff; font-size: 1rem; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
.brand .crest::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, transparent 55%, rgba(180,35,44,.55) 55%); }
.brand small { display: block; font-family: var(--font-sans); font-weight: 500; font-size: .68rem; letter-spacing: .04em; color: var(--ink-500); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: .55em .8em; border-radius: 9px; color: var(--ink-700);
  font-weight: 550; font-size: .94rem; transition: background .15s, color .15s;
}
.nav-links a:hover { background: var(--navy-50); color: var(--navy-800); text-decoration: none; }
.nav-links a.active { color: var(--navy-800); background: var(--navy-50); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: 1.5px solid var(--line-strong); border-radius: 10px; width: 44px; height: 40px; cursor: pointer; align-items:center; justify-content:center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { content:""; display:block; width:20px; height:2px; background: var(--navy-800); position: relative; transition: .2s; }
.nav-toggle span::before { position:absolute; top:-6px; } .nav-toggle span::after { position:absolute; top:6px; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { transform: rotate(45deg); top:0; }
body.nav-open .nav-toggle span::after { transform: rotate(-45deg); top:0; }

@media (max-width: 1150px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--line); padding: 12px var(--gutter) 22px; gap: 2px;
    box-shadow: var(--shadow-lg); transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .2s;
  }
  body.nav-open .nav-links { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: .8em .6em; border-radius: 10px; font-size: 1.02rem; }
  .nav-cta .btn-cta-text { display: none; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: var(--navy-900); color: #e7eefa; }
.hero::before {
  content:""; position:absolute; inset:0;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(47,93,163,.55), transparent 60%),
    radial-gradient(700px 500px at 5% 110%, rgba(180,35,44,.28), transparent 55%);
}
.hero::after {
  content:""; position:absolute; inset:0; opacity:.5;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 44px 44px; mask-image: radial-gradient(circle at 70% 30%, #000, transparent 75%);
}
.hero .wrap { position: relative; z-index: 1; padding-block: clamp(56px, 9vw, 110px); }
.hero h1 { color: #fff; max-width: 16ch; }
.hero .lead { color: #b9c8de; margin-top: 1rem; }
.hero-badges { display:flex; flex-wrap:wrap; gap: 10px; margin: 1.6rem 0 2rem; }
.hero-badge { display:inline-flex; align-items:center; gap:.5em; background: rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.16); padding:.45em .9em; border-radius:100px; font-size:.84rem; font-weight:550; color:#dce6f3; }
.hero-cta { display:flex; flex-wrap:wrap; gap: 14px; }
.scenario-card {
  background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.14); border-radius: var(--r-lg);
  padding: clamp(20px,3vw,30px); backdrop-filter: blur(6px);
}
.scenario-card h3 { color:#fff; font-size:1.05rem; margin-bottom: 1rem; }
.scenario-row { display:flex; align-items:center; gap:.8em; padding:.7em 0; border-top:1px solid rgba(255,255,255,.1); }
.scenario-row:first-of-type { border-top:0; }
.scenario-ico { width:38px; height:38px; flex:none; border-radius:10px; display:grid; place-items:center; font-size:1.05rem; background: rgba(255,255,255,.1); }
.scenario-row b { color:#fff; display:block; font-family:var(--font-sans); font-weight:600; font-size:.96rem; }
.scenario-row span { color:#9fb2cc; font-size:.82rem; }
.hero-grid { display:grid; grid-template-columns: 1.1fr .9fr; gap: clamp(28px,4vw,56px); align-items:center; }
@media (max-width: 900px){ .hero-grid { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(20px, 2.6vw, 30px); box-shadow: var(--shadow-sm); transition: transform .18s, box-shadow .2s, border-color .2s; }
.card-hover:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--line-strong); }
.card h3 { display:flex; align-items:center; gap:.5em; }
.card-ico { width:46px; height:46px; border-radius:12px; display:grid; place-items:center; font-size:1.3rem; background: var(--navy-50); color: var(--navy-700); margin-bottom: 1rem; }
.card-num { font-family: var(--font-serif); font-size: 2.4rem; color: var(--navy-100); line-height:1; font-weight:600; }
.pathway-card { position: relative; display:flex; flex-direction:column; }
.pathway-card .tag-row { margin-top:auto; }
.card-link { display:inline-flex; align-items:center; gap:.4em; font-weight:600; margin-top:1rem; }
.card-link::after { content:"→"; transition: transform .15s; }
.card-link:hover::after { transform: translateX(3px); }

/* ---------- Badges / tags ---------- */
.tag { display:inline-flex; align-items:center; gap:.4em; font-size:.76rem; font-weight:650; padding:.32em .7em; border-radius:100px; letter-spacing:.02em; }
.tag-navy { background: var(--navy-50); color: var(--navy-700); }
.tag-red { background: var(--red-50); color: var(--red-600); }
.tag-gold { background: var(--gold-50); color: var(--gold-600); }
.tag-green { background: var(--green-50); color: var(--green-600); }
.tag-row { display:flex; flex-wrap:wrap; gap:8px; }

/* ---------- Callouts ---------- */
.callout { display:flex; gap:14px; padding: 16px 18px; border-radius: var(--r-md); border:1px solid; margin: 1.4rem 0; background: var(--paper); }
.callout .c-ico { flex:none; width:30px; height:30px; border-radius:8px; display:grid; place-items:center; font-size:.95rem; font-weight:700; color:#fff; }
.callout p:last-child { margin-bottom:0; }
.callout strong { display:block; margin-bottom:.15em; }
.callout-info   { border-color: #bcd2ef; background: var(--navy-50); }
.callout-info .c-ico { background: var(--navy-600); }
.callout-warn   { border-color: #f0cf9b; background: var(--gold-50); }
.callout-warn .c-ico { background: var(--gold-600); }
.callout-deadline { border-color: #efb6b3; background: var(--red-50); }
.callout-deadline .c-ico { background: var(--red-600); }
.callout-tip    { border-color: #aedcc1; background: var(--green-50); }
.callout-tip .c-ico { background: var(--green-600); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border:1px solid var(--line); border-radius: var(--r-md); box-shadow: var(--shadow-sm); background:#fff; }
table.data { width:100%; border-collapse: collapse; min-width: 560px; font-size:.95rem; }
table.data th, table.data td { text-align:left; padding: 13px 16px; border-bottom:1px solid var(--line); vertical-align: top; }
table.data thead th { background: var(--navy-900); color:#fff; font-family: var(--font-sans); font-weight:600; font-size:.82rem; letter-spacing:.04em; text-transform:uppercase; position: sticky; top:0; }
table.data tbody tr:last-child td { border-bottom:0; }
table.data tbody tr:nth-child(even) { background: var(--paper-3); }
table.data tbody tr:hover { background: var(--navy-50); }
.fee { font-variant-numeric: tabular-nums; font-weight:650; color: var(--navy-800); white-space:nowrap; }

/* ---------- Steps / timeline ---------- */
.steps { list-style:none; padding:0; margin:0; counter-reset: step; }
.steps > li { position: relative; padding: 0 0 28px 64px; }
.steps > li::before {
  counter-increment: step; content: counter(step);
  position:absolute; left:0; top:0; width:42px; height:42px; border-radius:50%;
  background:#fff; border:2px solid var(--navy-600); color:var(--navy-700);
  font-family:var(--font-serif); font-weight:600; font-size:1.1rem; display:grid; place-items:center; z-index:1;
}
.steps > li::after { content:""; position:absolute; left:20px; top:42px; bottom:0; width:2px; background: var(--line-strong); }
.steps > li:last-child { padding-bottom:0; }
.steps > li:last-child::after { display:none; }
.steps h3 { margin-bottom:.25em; }
.step-meta { font-size:.82rem; color: var(--ink-500); font-weight:600; text-transform:uppercase; letter-spacing:.05em; margin-bottom:.4em; }

/* ---------- Accordion ---------- */
.acc { border:1px solid var(--line); border-radius: var(--r-md); overflow:hidden; background:#fff; box-shadow: var(--shadow-sm); }
.acc + .acc { margin-top:12px; }
.acc summary { cursor:pointer; list-style:none; padding: 17px 20px; font-weight:600; font-size:1.02rem; color:var(--navy-900); display:flex; justify-content:space-between; align-items:center; gap:14px; }
.acc summary::-webkit-details-marker { display:none; }
.acc summary::after { content:"+"; font-size:1.5rem; color:var(--navy-500); font-weight:400; transition: transform .2s; line-height:1; }
.acc[open] summary::after { transform: rotate(45deg); }
.acc summary:hover { background: var(--navy-50); }
.acc .acc-body { padding: 0 20px 20px; color: var(--ink-700); }
.acc .acc-body > *:first-child { margin-top:0; }

/* ---------- Doc / checklist list ---------- */
.checklist { list-style:none; padding:0; margin:1rem 0; }
.checklist li { position:relative; padding: 10px 0 10px 36px; border-bottom:1px dashed var(--line); }
.checklist li:last-child { border-bottom:0; }
.checklist li::before { content:""; position:absolute; left:0; top:14px; width:20px; height:20px; border-radius:6px; border:2px solid var(--navy-500); background: var(--navy-50); }
.checklist li::after { content:"✓"; position:absolute; left:4px; top:11px; color: var(--navy-600); font-size:.85rem; font-weight:800; }
.checklist li b { color: var(--navy-900); }

/* ---------- Page layout w/ sidebar TOC ---------- */
.doc-layout { display:grid; grid-template-columns: 240px 1fr; gap: clamp(28px,4vw,56px); align-items:start; }
.toc { position: sticky; top: calc(var(--header-h) + 24px); }
.toc h4 { font-family:var(--font-sans); text-transform:uppercase; letter-spacing:.1em; font-size:.74rem; color:var(--ink-500); margin:0 0 .8em; }
.toc ul { list-style:none; padding:0; margin:0; border-left:2px solid var(--line); }
.toc a { display:block; padding:.4em 0 .4em 1em; margin-left:-2px; border-left:2px solid transparent; color:var(--ink-500); font-size:.9rem; font-weight:550; }
.toc a:hover { color:var(--navy-700); text-decoration:none; }
.toc a.active { color:var(--navy-800); border-left-color: var(--red-500); }
@media (max-width: 920px){ .doc-layout { grid-template-columns: 1fr; } .toc { display:none; } }

/* ---------- Page header band ---------- */
.page-head { background: var(--navy-900); color:#dce6f3; position:relative; overflow:hidden; }
.page-head::before { content:""; position:absolute; inset:0; background: radial-gradient(700px 360px at 90% -20%, rgba(47,93,163,.5), transparent 60%); }
.page-head .wrap { position:relative; padding-block: clamp(40px,6vw,72px); }
.page-head h1 { color:#fff; }
.page-head .lead { color:#b9c8de; }
.crumbs { font-size:.84rem; color:#8ea6c6; margin-bottom: 1rem; display:flex; gap:.5em; flex-wrap:wrap; }
.crumbs a { color:#b9c8de; } .crumbs a:hover { color:#fff; }

/* ---------- Stat ---------- */
.stat { text-align:center; }
.stat .num { font-family:var(--font-serif); font-size: clamp(2rem,4vw,2.8rem); color: var(--navy-700); line-height:1; font-weight:600; }
.section--ink .stat .num { color: var(--gold-500); }
.stat .lbl { font-size:.9rem; color: var(--ink-500); margin-top:.4em; }
.section--ink .stat .lbl { color:#9fb2cc; }

/* =============================================================
   Eligibility Decision Tool
   ============================================================= */
.tool { background:#fff; border:1px solid var(--line); border-radius: var(--r-xl); box-shadow: var(--shadow-lg); overflow:hidden; }
.tool-head { background: linear-gradient(120deg, var(--navy-800), var(--navy-900)); color:#fff; padding: clamp(22px,3vw,30px); position:relative; }
.tool-head h3 { color:#fff; font-size:1.4rem; margin-bottom:.3em; }
.tool-head p { color:#aebfd7; margin:0; font-size:.96rem; }
.tool-progress { height:5px; background: rgba(255,255,255,.16); border-radius:100px; margin-top:18px; overflow:hidden; }
.tool-progress i { display:block; height:100%; background: var(--gold-500); width:0; transition: width .35s ease; border-radius:100px; }
.tool-body { padding: clamp(22px,3.4vw,38px); }
.q-step { display:none; animation: fade .35s ease; }
.q-step.is-active { display:block; }
@keyframes fade { from { opacity:0; transform: translateY(8px); } to { opacity:1; transform:none; } }
.q-kicker { font-size:.78rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--red-600); margin-bottom:.7em; }
.q-step h4 { font-size:1.45rem; margin-bottom:.5em; }
.q-step .q-help { color: var(--ink-500); font-size:.95rem; margin-bottom: 1.4em; }
.opts { display:grid; gap:12px; }
.opt {
  text-align:left; width:100%; background:#fff; border:1.5px solid var(--line-strong); border-radius: var(--r-md);
  padding: 16px 18px; cursor:pointer; font-family:var(--font-sans); font-size:1rem; color: var(--ink-900);
  display:flex; gap:14px; align-items:flex-start; transition: border-color .15s, background .15s, transform .12s; line-height:1.45;
}
.opt:hover { border-color: var(--navy-500); background: var(--navy-50); transform: translateY(-1px); }
.opt b { display:block; color:var(--navy-900); font-weight:650; margin-bottom:.1em; }
.opt span { color: var(--ink-500); font-size:.9rem; }
.opt .opt-key { flex:none; width:30px; height:30px; border-radius:8px; background: var(--navy-50); color:var(--navy-700); display:grid; place-items:center; font-weight:700; font-size:.95rem; }
.tool-nav { display:flex; justify-content:space-between; align-items:center; margin-top: 1.8em; gap:12px; flex-wrap:wrap; }
.tool-back { background:none; border:0; color:var(--ink-500); font-weight:600; cursor:pointer; font-size:.92rem; padding:.4em; }
.tool-back:hover { color: var(--navy-700); }
.tool-back[hidden] { visibility:hidden; }

/* Result panel */
.result { display:none; }
.result.is-active { display:block; animation: fade .4s ease; }
.result-head { display:flex; align-items:center; gap:14px; margin-bottom: 1.2em; }
.result-badge { flex:none; width:54px; height:54px; border-radius:14px; display:grid; place-items:center; font-size:1.6rem; color:#fff; }
.result-badge.good { background: var(--green-600); }
.result-badge.path { background: var(--navy-700); }
.result-badge.warn { background: var(--gold-600); }
.result h4 { font-size:1.5rem; margin:0; }
.result .result-sub { color:var(--ink-500); font-size:.92rem; font-weight:600; }
.result-card { border:1px solid var(--line); border-radius: var(--r-md); padding: 18px 20px; background: var(--paper-3); margin: 1em 0; }
.result-card h5 { font-family:var(--font-sans); font-size:.78rem; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-500); margin:0 0 .6em; }
.result-actions { display:flex; gap:12px; flex-wrap:wrap; margin-top:1.4em; }
.path-pill { display:inline-flex; align-items:center; gap:.5em; background:#fff; border:1.5px solid var(--navy-500); color:var(--navy-700); font-weight:650; padding:.5em 1em; border-radius:100px; font-size:.92rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-900); color:#9fb2cc; padding-block: clamp(40px,6vw,64px) 28px; margin-top: auto; }
.foot-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
@media (max-width: 820px){ .foot-grid { grid-template-columns: 1fr 1fr; gap:28px; } }
@media (max-width: 480px){ .foot-grid { grid-template-columns: 1fr; } }
.site-footer h5 { color:#fff; font-family:var(--font-sans); font-size:.8rem; letter-spacing:.1em; text-transform:uppercase; margin:0 0 1em; }
.site-footer a { color:#9fb2cc; display:block; padding:.28em 0; font-size:.92rem; }
.site-footer a:hover { color:#fff; }
.site-footer .brand { color:#fff; margin-bottom: .8em; }
.site-footer .brand small { color:#7e93b3; }
.foot-about { font-size:.9rem; line-height:1.7; max-width: 34ch; }
.foot-bottom { border-top:1px solid rgba(255,255,255,.12); margin-top: 36px; padding-top: 22px; display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-size:.82rem; color:#7e93b3; }

/* ---------- Disclaimer ribbon ---------- */
.disclaimer-strip { background: var(--gold-50); border-bottom:1px solid var(--gold-100); color: var(--gold-600); font-size:.82rem; text-align:center; padding:.5em var(--gutter); font-weight:550; }
.disclaimer-strip b { color: var(--gold-600); }

/* ---------- Misc ---------- */
.kicker-row { display:flex; align-items:center; justify-content:space-between; gap:20px; flex-wrap:wrap; margin-bottom: 2.4rem; }
.source-note { font-size:.82rem; color: var(--ink-400); margin-top:1.2em; }
.source-note a { color: var(--ink-500); }
.pill-list { display:flex; flex-wrap:wrap; gap:10px; list-style:none; padding:0; margin: 1rem 0; }
.pill-list li { background:#fff; border:1px solid var(--line); border-radius:100px; padding:.5em 1em; font-size:.9rem; font-weight:550; box-shadow: var(--shadow-sm); }
.anchor-offset { scroll-margin-top: calc(var(--header-h) + 20px); }
.back-to-top { position: fixed; right: 22px; bottom: 22px; z-index: 50; width: 46px; height:46px; border-radius:50%; background: var(--navy-800); color:#fff; border:0; display:grid; place-items:center; cursor:pointer; box-shadow: var(--shadow-lg); opacity:0; pointer-events:none; transition: opacity .25s, transform .25s; transform: translateY(8px); font-size:1.1rem; }
.back-to-top.show { opacity:1; pointer-events:auto; transform:none; }
.reading-bar { position: fixed; top:0; left:0; height:3px; background: var(--red-500); z-index:70; width:0; transition: width .1s linear; }

/* ---------- Theme toggle button ---------- */
.theme-toggle {
  width: 42px; height: 40px; flex: none; border-radius: 11px; cursor: pointer;
  background: transparent; border: 1.5px solid var(--line-strong); color: var(--navy-700);
  display: grid; place-items: center; transition: background .15s, border-color .15s, color .15s, transform .15s;
}
.theme-toggle:hover { background: var(--navy-50); border-color: var(--navy-500); transform: translateY(-1px); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .ico-sun { display: none; }
[data-theme="dark"] .theme-toggle .ico-sun { display: block; }
[data-theme="dark"] .theme-toggle .ico-moon { display: none; }

/* =============================================================
   DARK THEME
   ============================================================= */
:root[data-theme="dark"] {
  --bg:      #0b1422;
  --paper:   #121e2e;
  --paper-2: #0f1a28;
  --paper-3: #15202f;
  --ink-900: #e8eef7;
  --ink-700: #c4d0de;
  --ink-500: #95a3b5;
  --ink-400: #7c8a9d;
  --line:    #243345;
  --line-strong: #33475f;
  --navy-50: #16263c;   /* subtle dark-blue tint */
  --navy-100:#26405f;   /* muted faint number color */
}
[data-theme="dark"] body { color: var(--ink-900); }
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3, [data-theme="dark"] h4 { color: #eaf1fb; }
[data-theme="dark"] strong { color: #f1f6fc; }
[data-theme="dark"] a { color: #84adea; }

/* Header & nav */
[data-theme="dark"] .site-header { background: rgba(11,20,34,.85); border-bottom-color: var(--line); }
[data-theme="dark"] .brand, [data-theme="dark"] .brand span { color: #eaf1fb; }
[data-theme="dark"] .nav-links a { color: var(--ink-700); }
[data-theme="dark"] .nav-links a:hover, [data-theme="dark"] .nav-links a.active { background: #1b2e47; color: #dbe7f6; }
[data-theme="dark"] .nav-toggle { border-color: var(--line-strong); }
[data-theme="dark"] .nav-toggle span, [data-theme="dark"] .nav-toggle span::before, [data-theme="dark"] .nav-toggle span::after { background: #dbe7f6; }
[data-theme="dark"] .nav-links { background: #0f1a28; border-bottom-color: var(--line); }
[data-theme="dark"] .disclaimer-strip { background: #1d1a10; border-bottom-color: #3a3320; color: #d9b463; }
[data-theme="dark"] .disclaimer-strip b { color: #e6c878; }

/* Surfaces */
[data-theme="dark"] .card, [data-theme="dark"] .tool, [data-theme="dark"] .acc,
[data-theme="dark"] .table-wrap, [data-theme="dark"] .callout { background: var(--paper); }
[data-theme="dark"] .pill-list li { background: #16222f; border-color: var(--line); }
[data-theme="dark"] .opt { background: #16222f; border-color: #2c3e54; color: var(--ink-900); }
[data-theme="dark"] .opt:hover { background: #1b2e47; border-color: #3a6db5; }
[data-theme="dark"] .opt b { color: #eaf1fb; }
[data-theme="dark"] .opt span, [data-theme="dark"] .opt .opt-key { color: #9fc1f0; }
[data-theme="dark"] .opt .opt-key { background: #1b2e47; }

/* Accent text that assumed a light background */
[data-theme="dark"] .card-ico, [data-theme="dark"] code { background: #1b2e47; color: #9fc1f0; }
[data-theme="dark"] .fee, [data-theme="dark"] .stat .num { color: #9fc1f0; }
[data-theme="dark"] .acc summary { color: #eaf1fb; }
[data-theme="dark"] .acc summary:hover { background: #1b2e47; }
[data-theme="dark"] .toc a.active { color: #eaf1fb; }
[data-theme="dark"] .checklist li b { color: #eaf1fb; }
[data-theme="dark"] .checklist li::before { background: #1b2e47; border-color: #3a6db5; }
[data-theme="dark"] .checklist li::after { color: #9fc1f0; }
[data-theme="dark"] .steps > li::before { background: var(--paper); color: #9fc1f0; border-color: #3a6db5; }
[data-theme="dark"] .path-pill { background: #16263c; color: #9fc1f0; border-color: #3a6db5; }
[data-theme="dark"] .btn-ghost { color: #bcd0ea; border-color: var(--line-strong); }
[data-theme="dark"] .btn-ghost:hover { background: #1b2e47; border-color: #3a6db5; }
[data-theme="dark"] .result-card { background: var(--paper-3); border-color: var(--line); }

/* Tables */
[data-theme="dark"] table.data tbody tr:hover { background: #1b2e47; }

/* Tags */
[data-theme="dark"] .tag-navy { background: #1b2e47; color: #9fc1f0; }
[data-theme="dark"] .tag-red { background: #2e1718; color: #f0a3a0; }
[data-theme="dark"] .tag-gold { background: #2a2412; color: #d9b463; }
[data-theme="dark"] .tag-green { background: #12291d; color: #7fc99e; }

/* Callouts — keep the colored icon, darken the panel */
[data-theme="dark"] .callout-info { background: #13243a; border-color: #27456b; }
[data-theme="dark"] .callout-warn { background: #251f12; border-color: #5a4a23; }
[data-theme="dark"] .callout-deadline { background: #2a1517; border-color: #5e2b2c; }
[data-theme="dark"] .callout-tip { background: #102a1d; border-color: #22543a; }

/* Theme toggle in dark */
[data-theme="dark"] .theme-toggle { color: #e6c878; border-color: var(--line-strong); }
[data-theme="dark"] .theme-toggle:hover { background: #1b2e47; border-color: #3a6db5; }

/* Smooth the switch */
body, .site-header, .card, .tool, .acc, .callout, .opt, .table-wrap, .pill-list li {
  transition: background-color .25s ease, border-color .25s ease, color .25s ease;
}