/* ────────────────────────────────────────────────────────────
   nanobrain landing — v2.1 — coral on warm charcoal
   ──────────────────────────────────────────────────────────── */

:root {
  --bg:        #1a1614;
  --bg-deep:   #100c0a;
  --bg-card:   #221c18;
  --bg-elev:   #2a221d;
  --coral:     #E08263;
  --coral-deep:#7A4429;
  --coral-soft:#F4A586;
  --ink:       #f0e0d0;
  --ink-dim:   #d9c4b1;
  --ink-mute:  #9a8676;
  --ink-faint: #7a6655;
  --ok:        #8ed18a;
  --rule:      rgba(224,130,99,0.16);
  --rule-soft: rgba(240,224,208,0.06);

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.30);
  --shadow:    0 24px 60px rgba(0,0,0,0.55), 0 0 0 1px rgba(224,130,99,0.10);
  --shadow-lg: 0 40px 100px rgba(0,0,0,0.65), 0 0 0 1px rgba(224,130,99,0.14);

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Inter", -apple-system, system-ui, sans-serif;

  --container: 1180px;
  --narrow: 720px;
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;
}

@supports (font-variation-settings: normal) {
  :root { --sans: "Inter var", -apple-system, system-ui, sans-serif; }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  font-feature-settings: "ss01", "cv11", "calt";
  color: var(--ink);
  background: var(--bg);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(224,130,99,0.08), transparent 60%),
    radial-gradient(ellipse at center top, #221c18 0%, #1a1614 50%, #100c0a 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; height: auto; }

a { color: var(--coral-soft); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--coral); }

code {
  font-family: var(--mono);
  font-size: .92em;
  background: rgba(240,224,208,0.06);
  border: 1px solid var(--rule-soft);
  padding: 0.12em 0.42em;
  border-radius: 4px;
  color: var(--ink);
}

em { color: var(--coral); font-style: italic; }
strong { color: var(--ink); font-weight: 600; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--coral); color: var(--bg); padding: 8px 16px;
  border-radius: 0 0 8px 0; z-index: 100;
}
.skip-link:focus { left: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: var(--narrow); }
.container.centered { text-align: center; }

/* ─────────── nav ─────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(26,22,20,0.70);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--rule-soft);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }
.brand-mark { color: var(--coral); display: inline-flex; }
.brand-name { font-size: 17px; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-links a {
  color: var(--ink-mute);
  font-size: 14px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color .15s ease, background .15s ease;
}
.nav-links a:hover { color: var(--ink); background: rgba(240,224,208,0.04); }
.nav-cta {
  color: var(--ink) !important;
  background: rgba(240,224,208,0.06);
  border: 1px solid var(--rule-soft);
  display: inline-flex !important;
  align-items: center;
  gap: 6px;
}
.nav-cta:hover { background: rgba(240,224,208,0.10); border-color: var(--rule); }

@media (max-width: 720px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* ─────────── hero ─────────── */

.hero {
  padding: 96px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(224,130,99,0.08), transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(224,130,99,0.05), transparent 40%);
  pointer-events: none;
}
.hero > .container { position: relative; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-mute);
  background: rgba(240,224,208,0.04);
  border: 1px solid var(--rule-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 28px;
  letter-spacing: 0.02em;
}
.dot-pulse {
  width: 7px; height: 7px;
  background: var(--coral);
  border-radius: 50%;
  animation: pulse 2s ease-out infinite;
  box-shadow: 0 0 0 0 rgba(224,130,99,0.5);
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(224,130,99,0.5); }
  70% { box-shadow: 0 0 0 8px rgba(224,130,99,0); }
  100% { box-shadow: 0 0 0 0 rgba(224,130,99,0); }
}

.hero-title {
  font-size: clamp(44px, 7vw, 84px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.02;
  margin: 0 0 28px;
  color: var(--ink);
}
.hero-title em {
  font-style: italic;
  color: var(--coral);
  font-weight: 700;
}

.hero-lede {
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.5;
  color: var(--ink-dim);
  max-width: 640px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s ease;
  letter-spacing: -0.005em;
}
.btn-primary {
  background: var(--coral);
  color: var(--bg-deep) !important;
  box-shadow: 0 6px 24px rgba(224,130,99,0.30), 0 0 0 1px rgba(224,130,99,0.20);
}
.btn-primary:hover {
  background: var(--coral-soft);
  transform: translateY(-1px);
  box-shadow: 0 10px 32px rgba(224,130,99,0.40), 0 0 0 1px rgba(224,130,99,0.30);
}
.btn-ghost {
  background: rgba(240,224,208,0.04);
  color: var(--ink) !important;
  border-color: var(--rule-soft);
}
.btn-ghost:hover {
  background: rgba(240,224,208,0.08);
  border-color: var(--rule);
}
.btn-lg { padding: 14px 26px; font-size: 16px; }

.hero-meta {
  font-size: 14px;
  color: var(--ink-mute);
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.hero-meta strong { color: var(--ink-dim); font-weight: 600; }
.meta-sep { color: var(--ink-faint); }

.hero-demo {
  margin: 64px auto 0;
  max-width: 1080px;
  padding: 0 24px;
}
.demo-frame {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--rule-soft);
}
.demo-chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(180deg, #2a221d, var(--bg-card));
  border-bottom: 1px solid var(--rule-soft);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: #FF5F57; }
.dot-y { background: #FEBC2E; }
.dot-g { background: #28C840; }
.demo-title-bar {
  margin-left: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.demo-frame img { display: block; width: 100%; }

/* ─────────── section primitives ─────────── */

.rule {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule), transparent);
  margin: 64px auto;
  max-width: 600px;
}

.section-h2 {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 0 0 20px;
  color: var(--ink);
}
.section-lede {
  font-size: clamp(17px, 1.8vw, 20px);
  color: var(--ink-dim);
  margin: 0 0 36px;
  line-height: 1.5;
}
.section-head {
  margin-bottom: 56px;
  max-width: 720px;
}
.section-head.centered {
  margin-left: auto; margin-right: auto;
  text-align: center;
}
.kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.prose {
  font-size: 17px;
  color: var(--ink-dim);
  line-height: 1.75;
  margin: 0 0 20px;
}
.prose strong { color: var(--ink); }
.prose em { color: var(--coral); font-style: italic; }

/* ─────────── problem section ─────────── */

.problem {
  padding: 96px 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  background: linear-gradient(180deg, transparent, rgba(224,130,99,0.02), transparent);
}

/* ─────────── how it works ─────────── */

.how { padding: 120px 0; }
.layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}
.layer {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color .2s ease, transform .2s ease;
}
.layer:hover {
  border-color: var(--rule);
  transform: translateY(-2px);
}
.layer-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--coral);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.layer h3 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.layer p {
  font-size: 15px;
  color: var(--ink-mute);
  line-height: 1.65;
  margin: 0;
}
.layer code {
  background: rgba(224,130,99,0.10);
  border-color: rgba(224,130,99,0.20);
  color: var(--coral-soft);
}

@media (max-width: 880px) {
  .layers { grid-template-columns: 1fr; }
}

.flow {
  background: var(--bg-deep);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 32px;
  overflow-x: auto;
}
.flow pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink-dim);
  line-height: 1.6;
  white-space: pre;
}
.flow-arrow { color: var(--coral); }
.flow-cmd { color: var(--coral-soft); font-weight: 500; }

@media (max-width: 720px) {
  .flow { padding: 20px 16px; }
  .flow pre { font-size: 11px; }
}

/* ─────────── contrast table ─────────── */

.contrast {
  padding: 120px 0;
  border-top: 1px solid var(--rule-soft);
}
.contrast-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--rule-soft);
  background: var(--bg-card);
}
.contrast-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.contrast-table th,
.contrast-table td {
  padding: 16px 20px;
  text-align: center;
  border-bottom: 1px solid var(--rule-soft);
}
.contrast-table th {
  font-weight: 500;
  color: var(--ink-mute);
  font-size: 13px;
  letter-spacing: 0.02em;
  background: rgba(0,0,0,0.20);
}
.contrast-table th strong { color: var(--coral); font-weight: 600; }
.contrast-table tr:last-child td { border-bottom: none; }
.contrast-table td:first-child,
.contrast-table th:first-child {
  text-align: left;
  color: var(--ink-dim);
  font-weight: 500;
  width: 32%;
}
.contrast-table td:nth-child(2) {
  background: rgba(224,130,99,0.05);
  color: var(--coral-soft);
  font-weight: 600;
}
.contrast-table .yes { color: var(--coral); font-size: 18px; }
.contrast-table .meh { color: var(--ink-faint); font-size: 16px; }

/* ─────────── commands ─────────── */

.commands { padding: 120px 0; border-top: 1px solid var(--rule-soft); }
.cmd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.cmd-card {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.cmd-card:hover {
  border-color: var(--coral);
  background: var(--bg-elev);
}
.cmd-card code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--coral);
  font-size: 16px;
  font-weight: 500;
  display: block;
  margin-bottom: 10px;
}
.cmd-card p {
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.55;
  margin: 0;
}

.cmd-more {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  margin-top: 24px;
}
.cmd-more summary {
  padding: 18px 24px;
  font-size: 15px;
  color: var(--ink-dim);
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
}
.cmd-more summary::-webkit-details-marker { display: none; }
.cmd-more summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--coral);
  font-size: 20px;
  font-weight: 300;
  transition: transform .2s ease;
}
.cmd-more[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.cmd-more-list {
  padding: 0 24px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 4px 24px;
}
.cmd-more-list p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-mute);
  padding: 6px 0;
}
.cmd-more-list code {
  color: var(--coral-soft);
  background: transparent;
  border: none;
  padding: 0;
  font-size: 13px;
  margin-right: 10px;
}

/* ─────────── install ─────────── */

.install { padding: 120px 0; border-top: 1px solid var(--rule-soft); background: linear-gradient(180deg, transparent, rgba(224,130,99,0.02)); }
.install-steps {
  display: grid;
  gap: 16px;
}
.install-step {
  background: var(--bg-deep);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  align-items: start;
}
.install-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--coral);
  background: rgba(224,130,99,0.08);
  border: 1px solid rgba(224,130,99,0.20);
  border-radius: var(--radius-sm);
  padding: 6px 0;
  text-align: center;
  width: 56px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.install-step pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
  line-height: 1.7;
  overflow-x: auto;
}
.install-step pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--ink);
  white-space: pre;
}
.install-step .cmt {
  color: var(--ink-faint);
  font-style: italic;
}
.install-note {
  margin-top: 32px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.7;
  padding: 20px 24px;
  background: rgba(240,224,208,0.03);
  border-left: 2px solid var(--coral);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.install-note code { font-size: 13px; }

@media (max-width: 720px) {
  .install-step { grid-template-columns: 1fr; }
  .install-num { width: fit-content; padding: 6px 14px; }
  .install-step pre { font-size: 12px; }
}

/* ─────────── works with ─────────── */

.works-with { padding: 120px 0; border-top: 1px solid var(--rule-soft); }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.tool {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 24px 22px;
  position: relative;
}
.tool h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.tool p {
  font-size: 13px;
  color: var(--ink-mute);
  line-height: 1.6;
  margin: 0 0 16px;
}
.tool-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(240,224,208,0.06);
  color: var(--ink-mute);
  border: 1px solid var(--rule-soft);
}
.tool-badge-ok {
  background: rgba(224,130,99,0.10);
  color: var(--coral);
  border-color: rgba(224,130,99,0.25);
}

/* ─────────── lineage ─────────── */

.lineage { padding: 120px 0; border-top: 1px solid var(--rule-soft); }
.lineage-list {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
  display: grid;
  gap: 12px;
}
.lineage-list li {
  font-size: 15px;
  color: var(--ink-mute);
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
  line-height: 1.5;
}
.lineage-list li:last-child { border-bottom: none; }
.lineage-list strong { color: var(--ink); }
.lineage-list code { font-size: 13px; }

/* ─────────── final cta ─────────── */

.cta {
  padding: 140px 0;
  border-top: 1px solid var(--rule-soft);
  background:
    radial-gradient(ellipse 60% 40% at 50% 50%, rgba(224,130,99,0.08), transparent 70%);
}
.cta-title {
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 16px;
  color: var(--ink);
}
.cta-lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--ink-dim);
  margin: 0 0 36px;
}
.cta-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ─────────── footer ─────────── */

.foot {
  border-top: 1px solid var(--rule-soft);
  padding: 64px 0 32px;
  background: var(--bg-deep);
}
.foot-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.foot-col h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--ink-mute);
  margin: 0 0 16px;
}
.foot-col a {
  display: block;
  font-size: 14px;
  color: var(--ink-dim);
  padding: 4px 0;
}
.foot-col a:hover { color: var(--coral); }
.foot-tag {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 12px 0 0;
  line-height: 1.6;
  max-width: 280px;
}
.foot-bottom {
  font-size: 13px;
  color: var(--ink-faint);
  padding-top: 24px;
  border-top: 1px solid var(--rule-soft);
  text-align: center;
}

@media (max-width: 720px) {
  .foot-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ─────────── lineage-top badge ─────────── */

.lineage-top {
  padding: 64px 0;
  border-top: 1px solid var(--rule-soft);
}
.badge-row {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--coral-soft);
  background: rgba(224,130,99,0.08);
  border: 1px solid rgba(224,130,99,0.25);
  padding: 8px 16px;
  border-radius: 999px;
  letter-spacing: 0.01em;
}
.prose.centered { text-align: center; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ─────────── command tables (3-group) ─────────── */

.cmd-group-title {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--coral);
  margin: 48px 0 16px;
  font-family: var(--mono);
}
.cmd-group-title:first-of-type { margin-top: 0; }
.cmd-table {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.cmd-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--rule-soft);
  align-items: start;
  transition: background .15s ease;
}
.cmd-row:last-child { border-bottom: none; }
.cmd-row:hover { background: rgba(224,130,99,0.03); }
.cmd-row code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--coral);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--mono);
}
.cmd-row p {
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.6;
  margin: 0;
}
.cmd-row p code {
  color: var(--coral-soft);
  font-size: 13px;
}
@media (max-width: 720px) {
  .cmd-row { grid-template-columns: 1fr; gap: 8px; padding: 16px 18px; }
}

/* ─────────── how-foot ─────────── */

.how-foot {
  margin-top: 32px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.65;
  text-align: center;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ─────────── works-with foot ─────────── */

.works-foot {
  margin-top: 32px;
  font-size: 14px;
  color: var(--ink-mute);
  text-align: center;
}

/* ─────────── faq ─────────── */

.faq { padding: 120px 0; border-top: 1px solid var(--rule-soft); }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color .15s ease;
}
.faq-item:hover { border-color: var(--rule); }
.faq-item[open] { border-color: var(--rule); }
.faq-item summary {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
  letter-spacing: -0.005em;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--coral);
  font-size: 24px;
  font-weight: 300;
  transition: transform .2s ease;
  line-height: 1;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item p {
  padding: 0 24px 20px;
  margin: 0;
  font-size: 15px;
  color: var(--ink-dim);
  line-height: 1.7;
}
.faq-item code { font-size: 13px; }

/* ─────────── roadmap ─────────── */

.roadmap { padding: 120px 0; border-top: 1px solid var(--rule-soft); }
.roadmap-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.roadmap-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--ink-mute);
  line-height: 1.55;
}
.roadmap-list li.done {
  background: rgba(224,130,99,0.04);
  border-color: rgba(224,130,99,0.18);
  color: var(--ink-dim);
}
.roadmap-list li.done::before {
  content: "✓";
  position: absolute;
  margin-left: -36px;
  margin-top: 1px;
  color: var(--coral);
  font-weight: 600;
}
.roadmap-list li { position: relative; }
.rm-tag {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--coral);
  letter-spacing: 0.04em;
  background: rgba(224,130,99,0.08);
  border: 1px solid rgba(224,130,99,0.20);
  padding: 4px 8px;
  border-radius: 4px;
  text-align: center;
}
.roadmap-list li.done .rm-tag {
  color: var(--coral-soft);
  background: rgba(224,130,99,0.12);
  border-color: rgba(224,130,99,0.30);
}
.roadmap-list code { font-size: 13px; }
@media (max-width: 720px) {
  .roadmap-list li { grid-template-columns: 70px 1fr; gap: 14px; padding: 12px 16px; }
}

/* ─────────── selection ─────────── */

::selection { background: rgba(224,130,99,0.30); color: var(--ink); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}