/* =========================================================
   Open Agency — main.css
   Paper-and-ink aesthetic. One accent. No gradients.
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  --bg:           #FAF9F6;
  --ink:          #111111;
  --ink-soft:     #2a2a2a;
  --muted:        #5a5751;
  --rule:         #d9d5cd;
  --paper-2:      #F2EFE8;
  --paper-3:      #ECE7DB;

  --accent:       #B4432E;   /* muted red — commit */
  --accent-dark:  #8a3121;
  --accent-soft:  #f1dcd6;

  --ff-serif: "Fraunces", "EB Garamond", Georgia, "Times New Roman", serif;
  --ff-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
              "Helvetica Neue", Arial, sans-serif;
  --ff-mono:  ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-body:   1.125rem;     /* 18px */
  --fs-small:  0.9375rem;
  --lh-body:   1.6;

  --maxw-prose: 40rem;
  --maxw-wide:  68rem;

  --s-1: .5rem;
  --s-2: 1rem;
  --s-3: 1.5rem;
  --s-4: 2rem;
  --s-5: 3rem;
  --s-6: 5rem;
  --s-7: 8rem;

  --radius: 2px;
  --border: 1px solid var(--rule);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; }
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-dark); text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Base type ---------- */
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ff-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-feature-settings: "kern", "liga", "ss01";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--ff-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.12;
  color: var(--ink);
  margin: 0 0 var(--s-3);
  text-wrap: balance;
}
h1 { font-size: clamp(2.5rem, 6vw, 4.75rem); font-weight: 400; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.9rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); font-weight: 600; letter-spacing: 0; }
h4 { font-size: 1.0625rem; font-weight: 600; letter-spacing: 0.02em; text-transform: uppercase; color: var(--muted); }

p { margin: 0 0 var(--s-3); max-width: 40rem; }
p.lead {
  font-family: var(--ff-serif);
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  line-height: 1.45;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 44rem;
}

strong { font-weight: 600; }
em { font-style: italic; }
small { font-size: var(--fs-small); color: var(--muted); }

blockquote {
  margin: var(--s-5) 0;
  padding: 0 0 0 var(--s-4);
  border-left: 3px solid var(--accent);
  font-family: var(--ff-serif);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  line-height: 1.35;
  font-style: italic;
  color: var(--ink);
  max-width: 44rem;
}
blockquote cite { display: block; margin-top: var(--s-2); font-size: var(--fs-small); font-style: normal; color: var(--muted); font-family: var(--ff-sans); }
blockquote cite::before { content: "— "; }

code, kbd, samp { font-family: var(--ff-mono); font-size: 0.95em; }
hr { border: 0; border-top: var(--border); margin: var(--s-6) 0; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw-wide); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2.5rem); }
.prose { max-width: var(--maxw-prose); }
.section { padding: var(--s-7) 0; border-top: var(--border); }
.section:first-of-type { border-top: 0; }
.section-label {
  font-family: var(--ff-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-3);
}
.section-label::before { content: "§ "; opacity: 0.6; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: var(--border);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; padding-block: .9rem; gap: var(--s-3); }
.logo {
  font-family: var(--ff-serif);
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex; align-items: baseline; gap: .4rem;
}
.logo::before {
  content: "";
  display: inline-block;
  width: .55rem; height: .55rem;
  background: var(--accent);
  transform: translateY(-1px);
  border-radius: 50%;
}
.site-nav { display: flex; align-items: center; gap: clamp(.8rem, 2vw, 1.6rem); }
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: .25rem 0;
  position: relative;
}
.site-nav a.btn { color: var(--bg); padding: .5rem .95rem; }
.site-nav a.btn:hover { color: var(--bg); }
.site-nav a:not(.btn):hover { color: var(--accent); }
.site-nav a:not(.btn):hover::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background: var(--accent);
}
.nav-toggle { display: none; background: none; border: 0; padding: .35rem; }
@media (max-width: 820px) {
  .site-nav a:not(.btn) { display: none; }
  .site-nav .btn { padding: .45rem .8rem; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--ink);
  color: var(--bg);
  padding: .7rem 1.1rem;
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
  border: 1px solid var(--ink);
  transition: background .15s, color .15s, transform .15s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--bg); }
.btn .arrow { transition: transform .2s; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero { padding: clamp(4rem, 10vh, 7rem) 0 var(--s-7); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--s-6);
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--s-5); }
}
.hero h1 { margin-bottom: var(--s-4); }
.hero h1 em { color: var(--accent); font-style: italic; font-variation-settings: "opsz" 144; }
.hero .sub {
  font-family: var(--ff-serif);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 34rem;
  margin-bottom: var(--s-4);
}
.hero-ctas { display: flex; gap: var(--s-2); flex-wrap: wrap; margin-top: var(--s-4); }

/* Hero visual: dissolving portrait */
.hero-visual {
  aspect-ratio: 4/5;
  width: 100%;
  position: relative;
  overflow: hidden;
  border: var(--border);
  background: var(--paper-2);
}
.hero-visual svg { width: 100%; height: 100%; }
.hero-caption {
  font-size: .8125rem;
  color: var(--muted);
  margin-top: var(--s-2);
  font-style: italic;
  text-align: right;
}

/* Micro-strip below the fold */
.microstrip {
  border-top: var(--border);
  padding: .9rem 0;
  font-size: .875rem;
  color: var(--muted);
  display: flex; justify-content: space-between; align-items: center; gap: var(--s-3);
  flex-wrap: wrap;
}
.microstrip a { color: var(--ink); }

/* ---------- Problem cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0;
  margin-top: var(--s-5);
  border-top: var(--border);
  border-left: var(--border);
}
.card {
  padding: var(--s-4) var(--s-4);
  border-right: var(--border);
  border-bottom: var(--border);
  background: var(--bg);
  display: flex; flex-direction: column;
  min-height: 22rem;
}
.card .card-num {
  font-family: var(--ff-serif);
  font-size: .875rem;
  color: var(--accent);
  margin-bottom: var(--s-3);
  letter-spacing: 0.08em;
}
.card h3 { font-family: var(--ff-serif); font-size: 1.45rem; font-weight: 500; letter-spacing: -0.01em; text-transform: none; color: var(--ink); }
.card p { font-size: 1rem; line-height: 1.55; color: var(--ink-soft); }
.card .example {
  margin-top: auto;
  padding-top: var(--s-3);
  border-top: 1px dashed var(--rule);
  font-size: .875rem;
  color: var(--muted);
  font-style: italic;
}

/* ---------- India section ---------- */
.regtable-wrap { overflow-x: auto; margin-top: var(--s-4); border: var(--border); background: var(--bg); }
.regtable { width: 100%; border-collapse: collapse; font-size: .9375rem; }
.regtable th, .regtable td { padding: .85rem 1rem; text-align: left; vertical-align: top; border-bottom: var(--border); }
.regtable thead { background: var(--paper-2); }
.regtable th { font-family: var(--ff-sans); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; font-size: .78rem; color: var(--muted); }
.regtable tr:last-child td { border-bottom: 0; }
.regtable td:first-child { font-family: var(--ff-serif); font-weight: 500; color: var(--ink); font-size: 1.05rem; }
.regtable .highlight { background: var(--accent-soft); }

.mini-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--s-3); margin-top: var(--s-4); }
.mini-card { padding: var(--s-3); border: var(--border); background: var(--paper-2); }
.mini-card h4 { margin-bottom: .5rem; color: var(--accent); text-transform: none; letter-spacing: 0; font-family: var(--ff-serif); font-size: 1.05rem; font-weight: 600; }
.mini-card p { font-size: .9375rem; margin: 0; color: var(--ink-soft); }

/* ---------- Toolbox ---------- */
.tool-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
  margin-top: var(--s-5);
}
@media (max-width: 900px) { .tool-cards { grid-template-columns: 1fr; } }
.tool-card {
  background: var(--bg);
  border: var(--border);
  padding: var(--s-4);
  display: flex; flex-direction: column;
  min-height: 26rem;
  position: relative;
  text-decoration: none;
  color: var(--ink);
  transition: transform .2s, border-color .2s;
}
.tool-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.tool-card .tool-name {
  font-family: var(--ff-serif);
  font-size: 1.75rem;
  font-weight: 500;
  margin: var(--s-3) 0 .5rem;
}
.tool-card .tagline { font-style: italic; color: var(--accent); margin-bottom: var(--s-3); font-family: var(--ff-serif); font-size: 1.05rem; line-height: 1.35; }
.tool-card p { font-size: .95rem; color: var(--ink-soft); flex: 1; }
.tool-card .read-more { margin-top: var(--s-3); font-weight: 500; color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: .35rem; }
.tool-card:hover .read-more { color: var(--accent); }
.tool-card .read-more .arrow { transition: transform .2s; }
.tool-card:hover .read-more .arrow { transform: translateX(3px); }
.tool-card .icon { width: 48px; height: 48px; color: var(--accent); }

/* Comparison table */
.compare-wrap { overflow-x: auto; margin-top: var(--s-5); border: var(--border); background: var(--bg); }
.compare { width: 100%; border-collapse: collapse; font-size: .9375rem; min-width: 640px; }
.compare th, .compare td { padding: .85rem 1rem; text-align: left; border-bottom: var(--border); vertical-align: top; }
.compare thead { background: var(--paper-2); }
.compare th:first-child { background: var(--bg); }
.compare th { font-family: var(--ff-serif); font-size: 1.05rem; font-weight: 500; color: var(--ink); }
.compare td:first-child, .compare th:first-child { font-weight: 600; color: var(--muted); font-family: var(--ff-sans); font-size: .8125rem; text-transform: uppercase; letter-spacing: 0.06em; }
.compare tr:last-child td { border-bottom: 0; }

/* ---------- Simulator ---------- */
.sim {
  margin-top: var(--s-5);
  border: var(--border);
  background: var(--bg);
}
.sim-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
@media (max-width: 760px) { .sim-panels { grid-template-columns: 1fr; } }
.sim-panel { padding: var(--s-3); border-right: var(--border); }
.sim-panel:last-child { border-right: 0; border-left: var(--border); margin-left: -1px; }
@media (max-width: 760px) {
  .sim-panel { border-right: 0; border-bottom: var(--border); }
  .sim-panel:last-child { border-bottom: 0; border-left: 0; margin-left: 0; }
}
.sim-panel h3 {
  font-family: var(--ff-sans);
  font-size: .8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: var(--s-2);
}
.sim-panel.protected h3 { color: var(--accent); }
.sim-canvas-wrap {
  aspect-ratio: 1/1;
  background: var(--paper-3);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule);
}
.sim-canvas-wrap canvas { width: 100%; height: 100%; display: block; }
.sim-terminal {
  margin-top: var(--s-2);
  background: #0e0e0e;
  color: #d5d3cc;
  padding: .85rem 1rem;
  font-family: var(--ff-mono);
  font-size: .8125rem;
  line-height: 1.55;
  min-height: 9rem;
  border: 1px solid #2a2a28;
}
.sim-terminal .prompt { color: #6a8f75; }
.sim-terminal .ok { color: #9ad28e; }
.sim-terminal .warn { color: #e8b260; }
.sim-terminal .bad { color: #e67a6a; }
.sim-terminal .mute { color: #7a7870; }
.sim-terminal .flag {
  display: inline-block; padding: 1px 6px;
  background: #2a2a28; border-radius: 2px;
  margin-right: .3rem;
}
.sim-controls {
  padding: var(--s-3);
  border-top: var(--border);
  display: flex; gap: var(--s-2); flex-wrap: wrap; align-items: center;
  background: var(--paper-2);
}
.sim-controls .sim-note { margin-left: auto; font-size: .8125rem; color: var(--muted); font-style: italic; }
.sim-controls input[type="file"] {
  font: inherit; font-size: .875rem;
}
.sim-controls input[type="file"]::file-selector-button {
  background: var(--bg); color: var(--ink);
  border: 1px solid var(--ink);
  padding: .5rem .9rem;
  margin-right: .75rem;
  cursor: pointer;
  font-family: inherit;
}
.sim-controls input[type="file"]::file-selector-button:hover { background: var(--ink); color: var(--bg); }

.insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.insight {
  padding: 2rem;
  border: 1px solid var(--border, rgba(0,0,0,.08));
  border-radius: 12px;
  background: var(--surface, #fff);
  transition: transform .2s ease, border-color .2s ease;
}

.insight:hover {
  transform: translateY(-2px);
  border-color: var(--accent, #000);
}

.insight-num-pair {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.stat-block {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.insight .num-xl {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent, #000);
}

.insight .num-xl .pct {
  font-size: .5em;
  font-weight: 500;
  margin-left: .1em;
  color: var(--muted, #666);
}

.insight .stat-source {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted, #666);
  font-weight: 600;
}

.insight .vs {
  font-size: .95rem;
  color: var(--muted, #666);
  font-style: italic;
  padding-bottom: .6rem;
  align-self: center;
}

.insight h3 {
  font-size: 1.25rem;
  margin: 0 0 .75rem;
  line-height: 1.3;
}

.insight p {
  margin: 0;
  color: var(--muted, #444);
  line-height: 1.65;
}

.insight p em {
  font-style: italic;
  color: var(--accent, #000);
  font-weight: 500;
}

/* ---------- References / bibliography ---------- */
.refs {
  margin-top: var(--s-4);
  padding-left: 1.75rem;
  max-width: 48rem;
  font-size: .95rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.refs li {
  margin-bottom: var(--s-2);
  padding-left: .25rem;
}
.refs li::marker {
  color: var(--accent);
  font-family: var(--ff-serif);
  font-weight: 600;
}
.refs li a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
}
.refs li a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
.refs li:target {
  background: var(--accent-soft);
  padding: .35rem .5rem;
  margin-left: -.5rem;
}

.ref {
  font-size: .72em;
  line-height: 0;
  vertical-align: super;
  margin-left: .12em;
}
.ref a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}
.ref a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

/* ---------- Contribute ---------- */
.contrib-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: var(--s-5); border-left: var(--border); border-top: var(--border); }
@media (max-width: 780px) { .contrib-cols { grid-template-columns: 1fr; } }
.contrib-col { padding: var(--s-4); border-right: var(--border); border-bottom: var(--border); }
.contrib-col h3 {
  font-family: var(--ff-serif);
  font-size: 1.35rem; font-weight: 500;
  color: var(--ink); text-transform: none; letter-spacing: -0.01em;
  display: flex; align-items: baseline; gap: .6rem;
}
.contrib-col h3 .num { color: var(--accent); font-size: 1rem; }
.contrib-col p { font-size: .95rem; color: var(--ink-soft); }

.contrib-cta { text-align: center; margin-top: var(--s-5); }
.contrib-cta .btn { padding: 1rem 2rem; font-size: 1.05rem; }
.smallprint { text-align: center; font-size: .8125rem; color: var(--muted); margin-top: var(--s-3); font-style: italic; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 2px solid var(--ink);
  padding: var(--s-5) 0 var(--s-4);
  margin-top: var(--s-6);
  background: var(--bg);
}
.site-footer .wrap > div { padding: .65rem 0; border-bottom: 1px dashed var(--rule); font-size: .875rem; color: var(--muted); display: flex; gap: var(--s-3); flex-wrap: wrap; justify-content: space-between; }
.site-footer .wrap > div:last-child { border-bottom: 0; }
.site-footer a { color: var(--ink); }

/* ---------- Tool deep-dive page chrome ---------- */
.tool-page .hero { padding-block: var(--s-6) var(--s-5); }
.tool-page .tool-hero-grid {
  display: grid; grid-template-columns: 2fr 1fr; gap: var(--s-5); align-items: end;
  border-bottom: var(--border); padding-bottom: var(--s-5);
}
@media (max-width: 800px) { .tool-page .tool-hero-grid { grid-template-columns: 1fr; } }
.tool-page .tool-hero h1 { margin-bottom: var(--s-2); }
.tool-page .tool-hero .tagline { font-style: italic; color: var(--accent); font-family: var(--ff-serif); font-size: 1.25rem; margin-bottom: var(--s-3); }
.tool-page .meta { font-size: .875rem; color: var(--muted); border: var(--border); padding: var(--s-3); background: var(--paper-2); }
.tool-page .meta dt { font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; font-size: .72rem; color: var(--muted); margin-top: var(--s-2); }
.tool-page .meta dt:first-of-type { margin-top: 0; }
.tool-page .meta dd { margin: .2rem 0 0; font-family: var(--ff-serif); font-size: 1.05rem; color: var(--ink); }

.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-3); margin: var(--s-5) 0; }
@media (max-width: 720px) { .pros-cons { grid-template-columns: 1fr; } }
.pros-cons section { padding: var(--s-3); border: var(--border); }
.pros-cons .pros { border-left: 3px solid var(--accent); background: var(--paper-2); }
.pros-cons .cons { border-left: 3px solid var(--muted); background: var(--bg); }
.pros-cons h4 { text-transform: none; letter-spacing: 0; font-family: var(--ff-serif); font-size: 1.1rem; color: var(--ink); }
.pros-cons ul { padding-left: 1.1rem; margin: 0; }
.pros-cons li { margin-bottom: .6rem; font-size: .95rem; color: var(--ink-soft); }

.callout {
  margin: var(--s-5) 0;
  padding: var(--s-4);
  background: var(--paper-3);
  border-left: 3px solid var(--accent);
  font-family: var(--ff-serif);
  font-size: 1.15rem;
  line-height: 1.5;
}
.callout strong { font-family: var(--ff-sans); font-size: .72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); display: block; margin-bottom: .5rem; font-weight: 700; }

/* ---------- Figure plate (full-bleed illustration) ---------- */
.plate {
  margin: var(--s-5) 0;
  padding: 0;
}
.plate img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}
.plate figcaption {
  margin-top: var(--s-2);
  font-family: var(--ff-serif);
  font-size: var(--fs-small);
  font-style: italic;
  color: var(--muted);
  max-width: 44rem;
  line-height: 1.5;
}

.back-link { display: inline-flex; align-items: center; gap: .4rem; font-size: .9rem; color: var(--muted); text-decoration: none; margin-bottom: var(--s-3); }
.back-link:hover { color: var(--accent); }

/* ---------- Accessibility helpers ---------- */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--bg); padding: .6rem 1rem; z-index: 100;
}
.skip-link:focus { left: .5rem; top: .5rem; }

/* ---------- Reveal-on-scroll (progressive enhancement) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(12px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in { opacity: 1; transform: none; }
}