/* ============================================================
   VORA — Brand Site
   Editorial monochrome design system.
   Neutral ink on paper, hairline rules, near-square corners.
   Accent: deep teal #0f766e, used sparingly.
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f7f8;
  --ink: #161618;
  --ink-2: #55555e;
  --ink-3: #8b8b94;
  --line: #e7e7ea;
  --line-strong: #d6d6db;
  --accent: #0f766e;
  --dark: #0b0b0d;
  --dark-2: #141417;
  --radius: 3px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: rgba(15, 118, 110, 0.14); }

.container { max-width: 1160px; margin: 0 auto; padding: 0 32px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 32px; }

/* ---------- Aurora atmosphere (very faint, slow, low saturation) ---------- */

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background: var(--bg);
}
.aurora i {
  position: absolute;
  display: block;
  border-radius: 50%;
  filter: blur(90px);
}
.aurora i:nth-child(1) {
  width: 62vw; height: 62vw;
  top: -28vw; right: -14vw;
  background: radial-gradient(circle at center, rgba(15, 118, 110, 0.055), transparent 62%);
  animation: drift-a 90s var(--ease) infinite alternate;
}
.aurora i:nth-child(2) {
  width: 52vw; height: 52vw;
  bottom: -26vw; left: -16vw;
  background: radial-gradient(circle at center, rgba(22, 22, 24, 0.045), transparent 60%);
  animation: drift-b 120s var(--ease) infinite alternate;
}
.aurora i:nth-child(3) {
  width: 34vw; height: 34vw;
  top: 34vh; left: 42vw;
  background: radial-gradient(circle at center, rgba(15, 118, 110, 0.03), transparent 60%);
  animation: drift-c 105s var(--ease) infinite alternate;
}
@keyframes drift-a { from { transform: translate3d(0, 0, 0); } to { transform: translate3d(-7vw, 6vh, 0); } }
@keyframes drift-b { from { transform: translate3d(0, 0, 0); } to { transform: translate3d(6vw, -5vh, 0); } }
@keyframes drift-c { from { transform: translate3d(0, 0, 0); } to { transform: translate3d(-5vw, -4vh, 0); } }

@media (prefers-reduced-motion: reduce) {
  .aurora i { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Scroll reveal (opacity + transform only, ≤300ms) ---------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Type primitives ---------- */

.eyebrow {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 20px;
}
.eyebrow .tick { color: var(--accent); }

.h-display {
  font-size: clamp(38px, 5.6vw, 68px);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.h-section {
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.16;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.lede {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-2);
  max-width: 620px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(1.2) blur(14px);
  -webkit-backdrop-filter: saturate(1.2) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  height: 62px;
  gap: 36px;
}
.brand {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.3em;
  padding-left: 0.3em; /* optically balance letter-spacing */
}
.brand sup { font-size: 8px; letter-spacing: 0; color: var(--accent); vertical-align: super; }
.site-nav { display: flex; gap: 28px; flex: 1; }
.site-nav a {
  font-size: 13.5px;
  color: var(--ink-2);
  padding: 4px 0;
  transition: color 0.15s var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--ink); font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 14px; margin-left: auto; }

.lang-toggle {
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-2);
  font-size: 12.5px;
  padding: 5px 12px;
  letter-spacing: 0.04em;
  transition: border-color 0.15s var(--ease), color 0.15s var(--ease);
}
.lang-toggle:hover { border-color: var(--ink); color: var(--ink); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  width: 34px; height: 34px;
  position: relative;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute;
  left: 9px; right: 9px;
  height: 1.5px;
  background: var(--ink);
}
.nav-toggle span { top: 50%; transform: translateY(-50%); }
.nav-toggle span::before { top: -5px; left: 0; right: 0; }
.nav-toggle span::after { top: 5px; left: 0; right: 0; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 550;
  letter-spacing: 0.01em;
  line-height: 1;
  transition: opacity 0.15s var(--ease), border-color 0.15s var(--ease), transform 0.15s var(--ease), background-color 0.15s var(--ease);
  white-space: nowrap;
}
.btn svg { flex: none; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { opacity: 0.86; }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 15px 30px; font-size: 15px; }
.btn-invert { background: #fff; color: var(--ink); }
.btn-invert:hover { opacity: 0.88; }
.btn-outline-light { border-color: rgba(255, 255, 255, 0.28); color: #fff; background: transparent; }
.btn-outline-light:hover { border-color: rgba(255, 255, 255, 0.7); }

/* ---------- Hero ---------- */

.hero { padding: 108px 0 0; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
.hero h1 { max-width: 760px; }
.hero .lede { margin-top: 26px; }
.hero-cta { display: flex; align-items: center; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero-note {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-note .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--line-strong); }

.figure { margin-top: 72px; }
.figure-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
}
.figure-frame img { width: 100%; height: auto; }
.figure-caption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 2px 0;
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.03em;
}

/* ---------- Sections ---------- */

.section { padding: 112px 0; }
.section-tight { padding: 72px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-head { max-width: 640px; margin-bottom: 64px; }
.section-head .lede { margin-top: 18px; }

/* Editorial split: two columns with a hairline divider */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.split-col { padding: 8px 48px 8px 0; }
.split-col + .split-col {
  border-left: 1px solid var(--line);
  padding-left: 48px;
  padding-right: 0;
}
.split-col .col-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
}
.split-col h3 {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 10px 0 6px;
}
.split-col .col-tag {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}
.split-col p { font-size: 14.5px; color: var(--ink-2); line-height: 1.7; }

.rule-list { margin-top: 26px; }
.rule-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.rule-list li:last-child { border-bottom: 1px solid var(--line); }
.rule-list .idx {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  flex: none;
  width: 22px;
}
.rule-list .item-title { font-weight: 550; }
.rule-list .item-desc { color: var(--ink-2); margin-left: auto; text-align: right; font-size: 13px; }

/* Highlight rows (editorial table) */
.rows { border-top: 1px solid var(--line); }
.row-item {
  display: grid;
  grid-template-columns: 72px 240px 1fr;
  gap: 32px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.row-item .no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
}
.row-item h3 { font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.row-item p { font-size: 14.5px; color: var(--ink-2); line-height: 1.7; max-width: 560px; }

/* Model wordmark strip */
.model-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}
.model-strip span {
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 0 26px;
  border-right: 1px solid var(--line);
}
.model-strip span:first-child { padding-left: 0; }
.model-strip span:last-child { border-right: 0; }
.model-strip span.pin { color: var(--accent); }

/* Dark CTA band */
.band-dark {
  background: var(--dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 88px 56px;
  position: relative;
  overflow: hidden;
}
.band-dark::after {
  content: "";
  position: absolute;
  width: 480px; height: 480px;
  right: -160px; top: -200px;
  background: radial-gradient(circle at center, rgba(15, 118, 110, 0.22), transparent 62%);
  pointer-events: none;
}
.band-dark .eyebrow { color: rgba(255, 255, 255, 0.45); }
.band-dark h2 { font-size: clamp(26px, 3.6vw, 42px); font-weight: 600; letter-spacing: -0.015em; max-width: 640px; line-height: 1.18; }
.band-dark .band-actions { display: flex; gap: 14px; margin-top: 40px; flex-wrap: wrap; position: relative; z-index: 1; }
.band-dark .band-note { margin-top: 20px; font-size: 12.5px; color: rgba(255, 255, 255, 0.42); }

/* ---------- Feature page ---------- */

.feature-block {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  padding: 64px 0;
  border-top: 1px solid var(--line);
}
.feature-block:first-of-type { border-top: 0; padding-top: 8px; }
.feature-meta .feat-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
}
.feature-meta .feat-name {
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.feature-body h3 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.feature-body > p { font-size: 15px; color: var(--ink-2); line-height: 1.75; max-width: 640px; }
.feature-points { margin-top: 26px; max-width: 640px; }
.feature-points li {
  position: relative;
  padding: 11px 0 11px 22px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.6;
}
.feature-points li:last-child { border-bottom: 1px solid var(--line); }
.feature-points li::before {
  content: "";
  position: absolute;
  left: 2px; top: 21px;
  width: 8px; height: 1.5px;
  background: var(--ink-3);
}
.feature-points li strong { color: var(--ink); font-weight: 550; }

.feature-figure { margin: 24px 0 0; }

/* ---------- Download page ---------- */

.dl-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 56px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
}
.dl-card .ver {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  margin-top: 14px;
}
.dl-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }
.dl-meta { margin-top: 22px; font-size: 13px; color: var(--ink-3); display: flex; gap: 18px; flex-wrap: wrap; }
.dl-meta span { display: inline-flex; align-items: center; gap: 7px; }

.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  vertical-align: top;
}
.spec-table th {
  width: 220px;
  font-weight: 550;
  color: var(--ink);
}
.spec-table td { color: var(--ink-2); }
.spec-table tr:first-child th, .spec-table tr:first-child td { border-top: 1px solid var(--line); }

.steps { counter-reset: step; }
.steps li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.steps li:first-child { border-top: 1px solid var(--line); }
.steps .step-no {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
  padding-top: 2px;
}
.steps h4 { font-size: 15.5px; font-weight: 600; margin-bottom: 4px; }
.steps p { font-size: 14px; color: var(--ink-2); line-height: 1.65; max-width: 560px; }

.callout {
  display: flex;
  gap: 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 24px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.65;
  background: rgba(15, 118, 110, 0.03);
}
.callout strong { color: var(--ink); font-weight: 550; }

/* ---------- Changelog ---------- */

.log-entry {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  padding: 48px 0;
  border-top: 1px solid var(--line);
}
.log-entry:first-of-type { border-top: 0; padding-top: 8px; }
.log-meta .log-ver {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.log-meta .log-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  margin-top: 6px;
}
.log-meta .log-tag {
  display: inline-block;
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(15, 118, 110, 0.3);
  border-radius: var(--radius);
  padding: 3px 8px;
}
.log-body h3 { font-size: 19px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 12px; }
.log-body ul li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.65;
}
.log-body ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 18px;
  width: 7px; height: 1.5px;
  background: var(--ink-3);
}

/* ---------- Docs ---------- */

.doc-grid { display: grid; grid-template-columns: 200px 1fr; gap: 56px; align-items: start; }
.doc-toc { position: sticky; top: 94px; }
.doc-toc a {
  display: block;
  font-size: 13px;
  color: var(--ink-3);
  padding: 7px 0;
  border-left: 1px solid var(--line);
  padding-left: 16px;
  margin-left: -1px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.doc-toc a:hover { color: var(--ink); }
.doc-toc a.active { color: var(--ink); border-left-color: var(--accent); font-weight: 550; }

.doc-section { padding: 44px 0; border-top: 1px solid var(--line); }
.doc-section:first-of-type { border-top: 0; padding-top: 0; }
.doc-section h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  scroll-margin-top: 90px;
}
.doc-section .doc-lead { font-size: 14.5px; color: var(--ink-2); margin-bottom: 24px; max-width: 620px; }
.doc-section h3 { font-size: 16px; font-weight: 600; margin: 28px 0 10px; }
.doc-section p { font-size: 14.5px; color: var(--ink-2); line-height: 1.7; max-width: 640px; }
.doc-section p + p { margin-top: 10px; }

.kbd {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius);
  padding: 2px 7px;
  color: var(--ink);
  background: var(--bg-soft);
  line-height: 1.5;
}

.keys-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.keys-table td {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.keys-table tr:first-child td { border-top: 1px solid var(--line); }
.keys-table td:first-child { color: var(--ink-2); width: 55%; }
.keys-table td:last-child { text-align: right; }

.faq details {
  border-bottom: 1px solid var(--line);
}
.faq details:first-of-type { border-top: 1px solid var(--line); }
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  font-size: 15px;
  font-weight: 550;
  transition: color 0.15s var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 16px;
  font-weight: 400;
  color: var(--ink-3);
  flex: none;
  transition: transform 0.2s var(--ease);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary:hover { color: var(--accent); }
.faq .faq-a {
  padding: 0 0 22px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 620px;
}

/* ---------- Legal ---------- */

.legal-doc { padding: 40px 0 8px; }
.legal-doc h2 {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
  scroll-margin-top: 90px;
}
.legal-doc .legal-updated {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  margin-bottom: 28px;
}
.legal-doc h3 {
  font-size: 15.5px;
  font-weight: 600;
  margin: 30px 0 8px;
}
.legal-doc p, .legal-doc li {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.75;
}
.legal-doc p + p { margin-top: 10px; }
.legal-doc ul { margin: 8px 0 4px; }
.legal-doc ul li { padding: 4px 0 4px 20px; position: relative; }
.legal-doc ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 15px;
  width: 7px; height: 1.5px;
  background: var(--ink-3);
}
.legal-switch { display: flex; gap: 0; border: 1px solid var(--line-strong); border-radius: var(--radius); overflow: hidden; width: max-content; }
.legal-switch a {
  font-size: 13px;
  padding: 8px 20px;
  color: var(--ink-2);
}
.legal-switch a + a { border-left: 1px solid var(--line-strong); }
.legal-switch a.active { background: var(--ink); color: #fff; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.62);
  margin-top: 112px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 72px 0 56px;
}
.footer-brand .brand { color: #fff; }
.footer-brand p {
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.44);
  max-width: 300px;
}
.footer-col h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.36);
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  font-size: 13.5px;
  padding: 5px 0;
  color: rgba(255, 255, 255, 0.62);
  transition: color 0.15s var(--ease);
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.34);
  flex-wrap: wrap;
}

/* ---------- Page hero (subpages) ---------- */

.page-hero { padding: 88px 0 64px; }
.page-hero h1 { max-width: 720px; }
.page-hero .lede { margin-top: 20px; }

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .row-item { grid-template-columns: 48px 1fr; gap: 16px; }
  .row-item p { grid-column: 2; }
  .feature-block { grid-template-columns: 1fr; gap: 16px; padding: 48px 0; }
  .log-entry { grid-template-columns: 1fr; gap: 14px; }
  .doc-grid { grid-template-columns: 1fr; gap: 0; }
  .doc-toc { position: static; display: flex; flex-wrap: wrap; gap: 4px 20px; border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 8px; }
  .doc-toc a { border-left: 0; padding-left: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .site-nav {
    position: fixed;
    top: 62px;
    left: 0; right: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(14px);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line);
    padding: 8px 32px 16px;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 0; font-size: 15px; border-bottom: 1px solid var(--line); }
  .site-nav a:last-child { border-bottom: 0; }
  .nav-toggle { display: block; }
  .header-inner { gap: 16px; }
  .header-actions .btn { display: none; }
}

@media (max-width: 720px) {
  .container, .container-narrow { padding: 0 22px; }
  .section { padding: 76px 0; }
  .hero { padding-top: 72px; }
  .split { grid-template-columns: 1fr; }
  .split-col { padding: 0 0 40px; }
  .split-col + .split-col { border-left: 0; border-top: 1px solid var(--line); padding: 40px 0 0; }
  .rule-list .item-desc { display: none; }
  .band-dark { padding: 56px 28px; }
  .dl-card { padding: 36px 26px; }
  .figure { margin-top: 48px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; padding: 56px 0 44px; }
  .steps li { grid-template-columns: 40px 1fr; gap: 16px; }
  .log-entry { padding: 40px 0; }
}