/* Self-hosted fonts (no third-party requests) */
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/space-grotesk-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/space-grotesk-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/space-grotesk-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/space-grotesk-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-700-normal.woff2") format("woff2"); }

/* DynamicForm — product site styles (AG Studio Ventures family)
   Accent: cobalt #2F5BEA · Display: Space Grotesk · Body: IBM Plex Sans · Mono: IBM Plex Mono */

:root {
  --paper: #F7F8FB;
  --surface: #FFFFFF;
  --surface-2: #EEF1F8;
  --ink: #111827;
  --ink-2: #4B5563;
  --line: #DCE1EC;
  --cobalt: #2F5BEA;
  --cobalt-strong: #1E40C8;
  --cobalt-soft: #E3EAFD;
  --teal: #0F9D8A;
  --teal-soft: #DDF4F0;
  --coral: #F2664B;
  --coral-soft: #FDE7E2;
  --amber: #E7A020;
  --amber-soft: #FCF1DC;
  --plum: #8B5CF6;
  --plum-soft: #EEE7FE;
  --good: #16A34A;
  --bad: #DC2626;
  --shadow: 0 10px 30px -12px rgba(17, 24, 39, .18);
  --radius: 14px;
  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0E1320;
    --surface: #151B2B;
    --surface-2: #1C2438;
    --ink: #E8ECF5;
    --ink-2: #A3ADC2;
    --line: #2A3450;
    --cobalt: #7C9CFF;
    --cobalt-strong: #A5BBFF;
    --cobalt-soft: #1F2B52;
    --teal: #3CCFB8;
    --teal-soft: #123A36;
    --coral: #FF8A72;
    --coral-soft: #43231D;
    --amber: #F5BE55;
    --amber-soft: #3D301A;
    --plum: #B49BFF;
    --plum-soft: #2D2450;
    --good: #4ADE80;
    --bad: #F87171;
    --shadow: 0 10px 30px -12px rgba(0, 0, 0, .6);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--cobalt); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--cobalt-strong); }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 3px; border-radius: 6px; }

.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 16px; }

h1, h2, h3, h4 { font-family: var(--display); line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 600; }
p { margin: 0 0 1em; }
.lede { font-size: 1.2rem; color: var(--ink-2); max-width: 62ch; }
.eyebrow { font: 600 .8rem/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--cobalt); margin-bottom: 14px; }
.muted { color: var(--ink-2); }

/* Header */
header.site { position: sticky; top: 0; z-index: 40; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font: 700 1.15rem var(--display); color: var(--ink); text-decoration: none; }
.brand .mark { width: 32px; height: 32px; border-radius: 9px; background: var(--cobalt); display: grid; place-items: center; }
.brand .mark svg { width: 20px; height: 20px; }
nav.primary { display: flex; gap: 4px; margin-left: auto; align-items: center; }
nav.primary > a, nav.primary .menu > button { color: var(--ink); text-decoration: none; font: 500 .95rem var(--body); padding: 8px 12px; border-radius: 8px; background: none; border: 0; cursor: pointer; }
nav.primary > a:hover, nav.primary .menu > button:hover, nav.primary a.active { background: var(--surface-2); }
.menu { position: relative; }
.menu .panel { display: none; position: absolute; top: calc(100% + 6px); left: -160px; width: 640px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.menu:hover .panel, .menu:focus-within .panel, .menu.open .panel { display: grid; }
.panel h4 { font: 600 .75rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: 0 0 8px; }
.panel a { display: block; padding: 7px 8px; border-radius: 8px; color: var(--ink); text-decoration: none; font-size: .95rem; }
.panel a:hover { background: var(--cobalt-soft); }
.panel a small { display: block; color: var(--ink-2); font-size: .8rem; }
.bar .cta { margin-left: 8px; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; color: var(--ink); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px; font: 600 .98rem var(--body); text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s ease, background .15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--cobalt); color: #fff; }
.btn.primary:hover { background: var(--cobalt-strong); color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { color: #0E1320; } .btn.primary:hover { color: #0E1320; } }
.btn.ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn.small { padding: 8px 14px; font-size: .9rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

/* Sections */
main section { padding: 72px 0; }
main section.tight { padding: 40px 0; }
.hero { padding: 72px 0 40px; display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.hero .note { font-size: .9rem; color: var(--ink-2); margin-top: 14px; }
.section-head { max-width: 760px; margin-bottom: 36px; }
.band { background: var(--surface); border-block: 1px solid var(--line); }

.grid { display: grid; gap: 20px; }
.grid > * { min-width: 0; }
.card a, footer.site p a { overflow-wrap: anywhere; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin-bottom: 6px; }
.card p { color: var(--ink-2); margin: 0; font-size: .97rem; }
a.card { text-decoration: none; color: inherit; transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease; display: block; }
a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--cobalt); }
.card .icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 14px; }
.card .more { display: inline-block; margin-top: 12px; color: var(--cobalt); font-weight: 600; font-size: .92rem; }

.tint-cobalt { background: var(--cobalt-soft); color: var(--cobalt); }
.tint-teal { background: var(--teal-soft); color: var(--teal); }
.tint-coral { background: var(--coral-soft); color: var(--coral); }
.tint-amber { background: var(--amber-soft); color: var(--amber); }
.tint-plum { background: var(--plum-soft); color: var(--plum); }

.group-label { font: 600 .8rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: 28px 0 12px; display: flex; align-items: center; gap: 10px; }
.group-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* Steps */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step { display: grid; grid-template-columns: 56px 1fr; gap: 16px; align-items: start; }
.step::before { counter-increment: step; content: counter(step); width: 44px; height: 44px; border-radius: 50%; background: var(--cobalt-soft); color: var(--cobalt); font: 700 1.1rem var(--display); display: grid; place-items: center; }
.step h3 { margin: 8px 0 4px; }
.step p { color: var(--ink-2); margin: 0; }

/* Figures and illustrations */
figure { margin: 0; }
figure.illus { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 18px; box-shadow: var(--shadow); }
figure.illus figcaption, figure.shot figcaption { font-size: .9rem; color: var(--ink-2); margin-top: 12px; }
figure.shot .tag-illustrative { display: inline-block; font: 600 .72rem var(--mono); text-transform: uppercase; letter-spacing: .06em; background: var(--amber-soft); color: var(--amber); padding: 3px 8px; border-radius: 6px; margin-right: 6px; }
.illus-slot { border: 2px dashed var(--line); border-radius: 20px; padding: 28px; min-height: 220px; display: grid; place-content: center; text-align: center; color: var(--ink-2); background: repeating-linear-gradient(45deg, transparent 0 12px, var(--surface-2) 12px 13px); }
.illus-slot b { color: var(--ink); font-family: var(--mono); font-size: .85rem; display: block; margin-bottom: 6px; }

/* Example panel */
.example { border: 1.5px solid var(--plum); background: var(--plum-soft); border-radius: 20px; padding: 26px; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; }
.example .label { font: 600 .75rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--plum); margin-bottom: 8px; }
.example p { margin: 0; color: var(--ink); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 18px; text-align: center; }
.stat .num { font: 700 2.6rem/1 var(--display); color: var(--cobalt); }
.stat .lbl { color: var(--ink-2); font-size: .92rem; margin-top: 8px; }

/* FAQ */
details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin-bottom: 10px; }
summary { font-weight: 600; cursor: pointer; }
details p { margin: 10px 0 0; color: var(--ink-2); }

/* CTA band */
.cta-band { background: linear-gradient(120deg, var(--cobalt), #5B3FE0); color: #fff; border-radius: 24px; padding: 44px; display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: rgba(255,255,255,.88); margin: 0; }
.cta-band .btn.primary { background: #fff; color: #1E3A8A; }
.cta-band .btn.ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }

/* Tables */
table.plain { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; font-size: .95rem; }
table.plain th, table.plain td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.plain th { background: var(--surface-2); font-weight: 600; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-wrap table.plain { min-width: 640px; }

/* Forms */
.form { display: grid; gap: 14px; }
.form label { font-weight: 600; font-size: .92rem; display: block; margin-bottom: 4px; }
.form input, .form select, .form textarea { width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); font: inherit; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding: 48px 0 32px; margin-top: 40px; font-size: .93rem; color: var(--ink-2); }
footer.site .cols { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 28px; }
footer.site h4 { font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink); margin-bottom: 10px; }
footer.site a { color: var(--ink-2); text-decoration: none; display: block; padding: 3px 0; }
footer.site a:hover { color: var(--cobalt); }
footer.site p a { display: inline; }
.grid.four { grid-template-columns: repeat(4, 1fr); }
footer.site .legal { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* Illustration animation helpers (all disabled under reduced motion) */
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%, 100% { opacity: .35; } 50% { opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes dash { to { stroke-dashoffset: 0; } }
.anim-rise { animation: rise .7s ease both; }
@keyframes lift { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
@keyframes drag { 0% { transform: translate(0, 0); opacity: 1; } 70% { transform: translate(162px, 18px); opacity: 1; } 100% { transform: translate(162px, 18px); opacity: 0; } }
.lift { animation: lift 4s ease-in-out infinite; }
@keyframes grow { from { stroke-dasharray: 0 1000; } to { stroke-dasharray: 1000 0; } }
.grow { animation: grow 2s ease-out both; }
@keyframes ringfill { from { stroke-dashoffset: 390; } to { stroke-dashoffset: 0; } }
.ring-fill { animation: ringfill 1.6s ease-out both; }
.drag { animation: drag 3.2s ease-in-out infinite; }
figure.illus svg, figure.art svg { width: 100%; }
figure.art { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 14px; }
figure.art figcaption { font-size: .9rem; color: var(--ink-2); margin-top: 10px; }
figure.shot img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; border-radius: 12px; border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--surface); }
figure.shot figcaption { font-size: .9rem; color: var(--ink-2); margin-top: 10px; }
.anim-pulse { animation: pulse 2.4s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Responsive */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .grid.three, .grid.four { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(3, 1fr); }
  footer.site .cols { grid-template-columns: 1fr 1fr; }
  .menu .panel { left: auto; right: 0; width: min(640px, 92vw); }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  main section { padding: 48px 0; }
  .nav-toggle { display: inline-block; }
  nav.primary { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; padding: 12px 16px 18px; }
  nav.primary.open { display: flex; }
  .menu .panel { position: static; display: grid; width: auto; grid-template-columns: 1fr; box-shadow: none; border: 0; padding: 4px 0 8px 8px; }
  .bar .cta { display: none; }
  .grid.two, .grid.three, .grid.four { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .example, .cta-band { grid-template-columns: 1fr; padding: 24px; }
  .form .row { grid-template-columns: 1fr; }
  footer.site .cols { grid-template-columns: 1fr; }
}

/* ---- AI-first additions (spec grid, AI demo, core configurators) ---- */
.spec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.spec-grid > * { min-width: 0; }
.spec-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.spec-head { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.spec-head .icon { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; flex: none; }
.spec-head h3 { margin: 0; }
.spec-row { display: grid; gap: 2px; padding: 10px 0; border-top: 1px dashed var(--line); }
.spec-row:first-of-type { border-top: 0; }
.spec-row b { font-size: .95rem; }
.spec-row span { color: var(--ink-2); font-size: .92rem; }
.ai-demo { display: grid; grid-template-columns: 1fr 48px 1.15fr; gap: 16px; align-items: center; margin-top: 8px; }
.ai-demo > * { min-width: 0; }
.ai-prompt, .ai-proposal { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 20px; box-shadow: var(--shadow); }
.ai-prompt { background: var(--cobalt-soft); border-color: transparent; border-bottom-left-radius: 4px; }
.ai-prompt p { margin: 8px 0 0; font-size: 1.02rem; color: var(--ink); }
.ai-demo .who { display: flex; align-items: center; gap: 8px; font: 600 .78rem/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--cobalt); }
.ai-arrow { width: 48px; height: 48px; border-radius: 50%; background: var(--cobalt); color: #fff; display: grid; place-items: center; animation: pulse 2.4s ease-in-out infinite; }
.ai-proposal { border: 2px solid var(--cobalt); }
.ai-proposal ul { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
.ai-proposal li { display: grid; grid-template-columns: 96px 1fr; gap: 10px; background: var(--teal-soft); border-radius: 9px; padding: 8px 12px; font-size: .93rem; }
.ai-proposal li .k { color: var(--teal); font-weight: 700; }
.ai-buttons { display: flex; gap: 10px; margin-top: 14px; }
.ai-buttons .btn { pointer-events: none; }
.live-box { margin-top: 26px; background: var(--surface); border: 1px solid var(--line); border-left: 5px solid var(--teal); border-radius: var(--radius); padding: 20px 22px; }
.live-box h3 { display: flex; align-items: center; gap: 8px; color: var(--ink); }
.live-box h3 svg { color: var(--teal); }
ul.ticks { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 8px; }
ul.ticks li { position: relative; padding-left: 26px; color: var(--ink-2); }
ul.ticks li::before { content: ""; position: absolute; left: 2px; top: .45em; width: 12px; height: 7px; border-left: 2.5px solid var(--teal); border-bottom: 2.5px solid var(--teal); transform: rotate(-45deg); }
.enhance { margin-top: 28px; display: flex; gap: 20px; align-items: center; justify-content: space-between; background: var(--cobalt-soft); border-radius: var(--radius); padding: 20px 24px; }
.enhance h3 { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.enhance p { margin: 0; color: var(--ink-2); }
.enhance .btn { flex: none; }
.core-card { position: relative; border-top: 5px solid var(--cobalt); }
.core-card .ai-badge { position: absolute; top: 20px; right: 20px; display: inline-flex; align-items: center; gap: 5px; background: var(--cobalt); color: #fff; font: 600 .72rem/1 var(--mono); padding: 6px 9px; border-radius: 999px; }
.core-card ul.ticks { margin-top: 12px; font-size: .93rem; }
@media (max-width: 900px) {
  .spec-grid { grid-template-columns: 1fr 1fr; }
  .ai-demo { grid-template-columns: 1fr; }
  .ai-arrow { margin: 0 auto; transform: rotate(90deg); }
  .enhance { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 600px) {
  .spec-grid { grid-template-columns: 1fr; }
  .ai-proposal li { grid-template-columns: 1fr; gap: 2px; }
}

/* ---- Vertical tour rail (site shell) ---- */
.shell { display: grid; grid-template-columns: 284px minmax(0, 1fr); align-items: start; }
.shell-main { min-width: 0; }
.rail { position: sticky; top: 64px; height: calc(100vh - 64px); overflow-y: auto; border-right: 1px solid var(--line); background: var(--surface); }
.rail-desk { padding: 18px 12px 24px; }
.rail-title { font: 600 .74rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: 14px 10px 8px; }
.rail ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.rail ol a { display: grid; grid-template-columns: 28px 1fr; gap: 10px; align-items: start; padding: 8px 10px; border-radius: 10px; text-decoration: none; color: var(--ink); border-left: 3px solid transparent; }
.rail ol a:hover { background: var(--surface-2); }
.rail ol a .n { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font: 700 .78rem var(--display); background: var(--surface-2); color: var(--ink-2); }
.rail ol a b { display: block; font-size: .92rem; font-weight: 600; line-height: 1.25; }
.rail ol a small { display: block; font-size: .78rem; color: var(--ink-2); line-height: 1.3; margin-top: 2px; }
.rail ol a.current { background: var(--cobalt-soft); border-left-color: var(--cobalt); }
.rail ol a.current .n { background: var(--cobalt); color: #fff; }
.rail ol a.seen .n { background: var(--teal-soft); color: var(--teal); }
.rail ol a.seen .n::after { content: "✓"; font-size: .7rem; margin-left: 1px; }
.rail-home { display: block; padding: 9px 12px; border-radius: 10px; font-weight: 600; color: var(--ink); text-decoration: none; }
.rail-home:hover, .rail-home.current { background: var(--cobalt-soft); color: var(--cobalt); }
.rail-foot { margin: 16px 10px 0; padding-top: 14px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: .88rem; }
.rail-foot a { color: var(--ink-2); text-decoration: none; }
.rail-foot a:hover { color: var(--cobalt); }
.rail-foot .btn { width: 100%; justify-content: center; margin-top: 8px; color: #fff; }
.rail-mob { display: none; }
.tour-step { padding-top: 22px; font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); }
.tour-step + .hero { padding-top: 24px; }
.tour-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 12px 0 40px; }
.tour-nav .tn { display: grid; gap: 4px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.tour-nav .tn:hover { border-color: var(--cobalt); transform: translateY(-2px); }
.tour-nav .tn small { color: var(--ink-2); font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.tour-nav .tn b { font: 700 1.15rem var(--display); }
.tour-nav .next { text-align: right; border-color: var(--cobalt); background: var(--cobalt-soft); }
ol.journey { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; counter-reset: j; }
ol.journey a { display: grid; grid-template-columns: 44px 1fr; gap: 14px; align-items: center; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
ol.journey a:hover { border-color: var(--cobalt); transform: translateY(-2px); }
ol.journey .n { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--cobalt-soft); color: var(--cobalt); font: 700 1.05rem var(--display); }
ol.journey b { display: block; font: 700 1.05rem var(--display); }
ol.journey small { display: block; color: var(--ink-2); font-size: .9rem; margin-top: 2px; }
.shell .wrap { width: min(1100px, 100% - 64px); }
@media (max-width: 1240px) {
  .shell .hero { grid-template-columns: 1fr; }
  .shell .grid.four { grid-template-columns: repeat(2, 1fr); }
  .spec-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1000px) {
  .shell { grid-template-columns: 1fr; }
  .rail { position: sticky; top: 64px; height: auto; overflow: visible; z-index: 30; border-right: 0; border-bottom: 1px solid var(--line); }
  .rail-desk { display: none; }
  .rail-mob { display: block; }
  .rail-mob summary { list-style: none; cursor: pointer; padding: 12px 16px; font: 600 .9rem var(--body); display: flex; justify-content: space-between; align-items: center; }
  .rail-mob summary::after { content: "▾"; color: var(--ink-2); }
  .rail-mob[open] summary::after { content: "▴"; }
  .rail-mob summary::-webkit-details-marker { display: none; }
  .rail-mob[open] { max-height: calc(100vh - 64px); overflow-y: auto; padding-bottom: 12px; }
  .rail-mob ol, .rail-mob .rail-home { margin: 0 8px; }
  .shell .wrap { width: min(1100px, 100% - 32px); }
  ol.journey { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .tour-nav { grid-template-columns: 1fr; }
  .tour-nav .next { order: -1; }
}
@media (max-width: 700px) {
  .spec-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1000px) {
  .tour-step { display: none; }
  .rail-mob { border: 0; border-radius: 0; margin: 0; background: var(--surface); }
}
.shell h1 { font-size: clamp(2rem, 3.1vw, 2.9rem); }

/* ---- Sub-pages: collapsed parts in the rail + on-page part tabs ---- */
.rail li.sec { position: relative; }
.rail details.subs { margin: 0 0 4px 48px; }
.rail details.subs > summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; font: 600 .74rem var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--ink-2); padding: 3px 8px; border-radius: 6px; }
.rail details.subs > summary::-webkit-details-marker { display: none; }
.rail details.subs > summary::before { content: "▸"; font-size: .8rem; transition: transform .15s; }
.rail details.subs[open] > summary::before { transform: rotate(90deg); }
.rail details.subs > summary:hover { background: var(--surface-2); color: var(--ink); }
.rail details.subs ol { margin: 4px 0 6px; padding: 0 0 0 10px; border-left: 2px solid var(--line); gap: 0; }
.rail details.subs ol a { display: block; padding: 5px 10px; font-size: .86rem; border-radius: 8px; border-left: 0; color: var(--ink-2); }
.rail details.subs ol a:hover { color: var(--ink); background: var(--surface-2); }
.rail details.subs ol a.current-sub { color: var(--cobalt); font-weight: 600; background: var(--cobalt-soft); }
.subtabs { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 14px; }
.subtabs a { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px 8px 8px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--ink); text-decoration: none; font-size: .9rem; font-weight: 500; }
.subtabs a span { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); color: var(--ink-2); font: 700 .74rem var(--display); }
.subtabs a:hover { border-color: var(--cobalt); }
.subtabs a.on { background: var(--cobalt); border-color: var(--cobalt); color: #fff; }
.subtabs a.on span { background: #fff; color: var(--cobalt); }
@media (prefers-color-scheme: dark) { .subtabs a.on { color: #0E1320; } .subtabs a.on span { background: #0E1320; color: var(--cobalt); } }
.subtabs + section, .subtabs + .hero { padding-top: 32px; }
@media (max-width: 1000px) {
  .tour-step { display: block; padding-top: 16px; }
  .subtabs { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; scrollbar-width: thin; }
  .subtabs a { flex: none; }
}
.rail details.subs { border: 0; padding: 0; background: none; box-shadow: none; border-radius: 0; }
.rail details.subs > summary { padding: 3px 8px; margin: 0; font-size: .72rem; }
@media (max-width: 1000px) { .tour-step { display: none; } .subtabs { padding-top: 16px; } }
.rail details.subs > summary { text-transform: none; letter-spacing: 0; font: 600 .8rem var(--body); }

/* ---- Copy link (constant address bar) ---- */
.copylink { position: fixed; right: 18px; bottom: 18px; z-index: 50; display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: 600 .85rem var(--body); box-shadow: var(--shadow); cursor: pointer; }
.copylink:hover { border-color: var(--cobalt); color: var(--cobalt); }
@media (max-width: 600px) { .copylink span { display: none; } .copylink { padding: 11px; } }
@media print { .copylink { display: none; } }

/* ---- SEO structure helpers ---- */
h1.as-h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); }
ol.stop-topics { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
ol.stop-topics a { display: grid; gap: 4px; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); }
ol.stop-topics a:hover { border-color: var(--cobalt); }
ol.stop-topics b { font: 700 1.02rem var(--display); }
ol.stop-topics span { color: var(--ink-2); font-size: .92rem; }
.audience .card h3 { font-size: 1.2rem; }
@media (max-width: 760px) { ol.stop-topics { grid-template-columns: 1fr; } }

/* ---- Resources (guides, explainers, glossary) ---- */
.article { max-width: 820px; padding: 40px 0 24px; }
.article h1 { margin-bottom: .4em; }
.article h2 { margin: 1.8em 0 .5em; font-size: clamp(1.35rem, 2vw, 1.7rem); }
.article p { color: var(--ink-2); font-size: 1.05rem; }
.article .byline { font: 600 .8rem var(--mono); color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; margin-top: 8px; }
.article .grid { margin-top: 10px; }
.draft-pill { display: inline-block; margin-left: 8px; padding: 3px 9px; border-radius: 999px; background: var(--amber-soft); color: var(--amber); font: 700 .7rem var(--mono); letter-spacing: .04em; vertical-align: middle; }
dl.glossary { display: grid; gap: 0; margin-top: 18px; border-top: 1px solid var(--line); }
dl.glossary .term { display: grid; grid-template-columns: 220px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 90px; }
dl.glossary dt { font: 700 1rem var(--display); color: var(--ink); }
dl.glossary dd { margin: 0; color: var(--ink-2); }
dl.glossary .term:target { background: var(--cobalt-soft); }
@media (max-width: 600px) { dl.glossary .term { grid-template-columns: 1fr; gap: 4px; } }

/* ---- Knowledge base groups ---- */
.kb-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.kb-chips a { display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--ink); text-decoration: none; font-size: .9rem; font-weight: 500; }
.kb-chips a span { font: 700 .75rem var(--mono); color: var(--ink-2); }
.kb-chips a:hover { border-color: var(--cobalt); }
.kb-group h2 { font-size: clamp(1.3rem, 2vw, 1.6rem); margin-bottom: 14px; }
.kb-group details { scroll-margin-top: 90px; }
.kb-group details:target { border-color: var(--cobalt); }
.kb-group summary .draft-pill { margin-left: 10px; }

/* ---- In short (speakable summary) and updated line ---- */
.in-short { margin-top: 8px; margin-bottom: 8px; padding: 18px 22px; border-left: 5px solid var(--cobalt); background: var(--cobalt-soft); border-radius: var(--radius); }
.shell .in-short { width: min(1100px, 100% - 64px); }
.in-short b { font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--cobalt); }
.in-short p { margin: 6px 0 0; font-size: 1.05rem; color: var(--ink); }
.updated { font: 600 .74rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); padding-bottom: 24px; }
@media (max-width: 1000px) { .shell .in-short { width: min(1100px, 100% - 32px); } }