/* ============================================================
   Appice Documentation — styles.css
   Brand: --blue #0050FF  --dark #050D1F
   ============================================================ */

/* ── Help-center vars ── */
:root { --ac-nav-h: 72px; }

:root {
  --bg:      #F7F9FC;
  --surface: #FFFFFF;
  --text:    #050D1F;
  --muted:   #5B6B8A;
  --border:  #E2EAF6;
  --blue:    #0050FF;
  --blue-l:  #EEF4FF;
  --blue-d:  #003FCC;
  --shadow-s: 0 1px 4px rgba(5,13,31,.06);
  --shadow:   0 4px 20px rgba(5,13,31,.08);
  --shadow-l: 0 8px 36px rgba(5,13,31,.11);
  --r:   12px;
  --r-l: 16px;
  --max: 1280px;
  --sbw: 256px;
  --tocw: 216px;
  --dh:  60px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* ── Docs Header ── */
.dh {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: var(--dh);
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-s);
}
.dh__inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 0;
}
.dh__logo {
  display: flex; align-items: center; gap: 0;
  text-decoration: none; flex-shrink: 0; margin-right: 8px;
}
.dh__logo img { height: 26px; width: auto; }
.dh__logo:hover { text-decoration: none; }
.dh__logo-sep {
  display: inline-block; width: 1px; height: 18px;
  background: var(--border); margin: 0 12px;
}
.dh__logo-label {
  font-size: 13px; color: var(--muted); font-weight: 500; white-space: nowrap;
}
.dh__tabs {
  display: flex; align-items: center; gap: 2px; flex: 1;
}
.dh__tab {
  padding: 6px 14px; border-radius: 8px; font-size: 14px;
  font-weight: 600; color: var(--muted); text-decoration: none;
  transition: background .15s, color .15s; white-space: nowrap;
}
.dh__tab:hover { background: var(--blue-l); color: var(--blue); text-decoration: none; }
.dh__tab.is-active { background: var(--blue-l); color: var(--blue); }
.dh__right { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.dh__search-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 12px; background: #F3F6FB;
  border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; transition: border-color .15s, box-shadow .15s;
  width: 210px;
  font-family: inherit; font-size: 13px; color: var(--muted);
}
.dh__search-bar:hover { border-color: var(--blue); }
.dh__search-bar > span { flex: 1; text-align: left; }
.dh__search-bar kbd {
  font-size: 11px; color: var(--muted); background: #fff;
  border: 1px solid #D1D5DB; border-radius: 4px;
  padding: 1px 5px; font-family: inherit;
}
.dh__login {
  font-size: 13px; font-weight: 600; color: var(--muted);
  padding: 6px 14px; border-radius: 8px; text-decoration: none;
  border: 1px solid var(--border); transition: border-color .15s, color .15s;
  white-space: nowrap;
}
.dh__login:hover { border-color: var(--blue); color: var(--blue); text-decoration: none; }
.dh__burger {
  display: none; background: none; border: none; cursor: pointer;
  padding: 6px; flex-direction: column; gap: 5px; margin-left: 12px;
  align-items: center;
}
.dh__burger span {
  display: block; width: 20px; height: 2px;
  background: var(--text); border-radius: 2px; transition: .2s;
}

/* ── Docs Mobile Menu ── */
.dh__mobile {
  display: none; position: fixed; top: var(--dh); left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  padding: 12px 16px; z-index: 199;
  flex-direction: column; gap: 2px;
  box-shadow: var(--shadow);
  max-height: calc(100vh - var(--dh)); overflow-y: auto;
}
.dh__mobile.open { display: flex; }
.dh__mobile a {
  padding: 9px 14px; border-radius: 8px;
  font-size: 14px; font-weight: 500; color: var(--text);
  text-decoration: none; transition: background .12s;
}
.dh__mobile a:hover { background: var(--blue-l); color: var(--blue); text-decoration: none; }
.dh__mobile-sep { height: 1px; background: var(--border); margin: 6px 0; }

/* ── Search overlay (replaces ac-search-overlay styles from appice-chrome) ── */
.ac-search-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(5,13,31,.55); backdrop-filter: blur(4px);
  display: none; align-items: flex-start; justify-content: center;
  padding-top: 80px;
}
.ac-search-overlay.open { display: flex; }
.ac-search-box {
  width: min(640px, calc(100vw - 32px));
  background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: 0 24px 64px rgba(5,13,31,.2);
}
.ac-search-input-row {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; border-bottom: 1px solid var(--border);
}
.ac-search-icon { color: var(--muted); flex-shrink: 0; }
.ac-search-input {
  flex: 1; border: none; outline: none;
  font-size: 16px; color: var(--text); background: transparent;
}
.ac-search-kbd {
  font-size: 11px; color: var(--muted); background: #F3F6FB;
  border: 1px solid var(--border); border-radius: 4px; padding: 2px 6px;
}
.ac-search-close {
  background: none; border: none; cursor: pointer;
  padding: 4px; color: var(--muted); border-radius: 6px;
  display: flex; align-items: center;
}
.ac-search-close:hover { background: var(--blue-l); color: var(--blue); }
.ac-search-results { padding: 6px 0; max-height: 380px; overflow-y: auto; }
.ac-sr-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 18px; cursor: pointer;
  text-decoration: none; color: var(--text);
}
.ac-sr-item:hover { background: #F5F8FF; text-decoration: none; }
.ac-sr-label {
  font-size: 11px; font-weight: 600; color: var(--muted);
  background: #F3F6FB; border: 1px solid var(--border);
  border-radius: 4px; padding: 2px 7px; white-space: nowrap;
}
.ac-sr-title { font-size: 14px; font-weight: 600; color: var(--text); }

/* ── HOMEPAGE ── */
.hp-hero {
  background: linear-gradient(160deg, #050D1F 0%, #0B1D45 100%);
  padding: 64px 24px 100px;
  text-align: center; position: relative; overflow: hidden;
}
.hp-hero::before {
  content: ""; position: absolute; top: -100px; right: -100px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(0,80,255,.22), transparent 70%);
  pointer-events: none;
}
.hp-hero::after {
  content: ""; position: absolute; bottom: -60px; left: -80px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(0,80,255,.14), transparent 70%);
  pointer-events: none;
}
.hp-hero__eyebrow {
  display: block; font-size: 12px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  color: rgba(255,255,255,.45); margin: 0 0 16px;
}
.hp-hero__title {
  font-size: clamp(34px, 5vw, 56px); font-weight: 800;
  color: #fff; margin: 0 0 14px;
  letter-spacing: -.035em; line-height: 1.05;
}
.hp-hero__sub {
  font-size: 17px; color: rgba(255,255,255,.55); margin: 0 0 36px;
}
.hp-hero__search-wrap { max-width: 580px; margin: 0 auto; position: relative; z-index: 1; }
.hp-hero__search {
  display: flex; align-items: center; gap: 12px;
  background: #fff; border-radius: 14px; padding: 13px 18px;
  box-shadow: 0 20px 60px rgba(0,80,255,.2); cursor: text;
}
.hp-hero__search svg { color: #9CA3AF; flex-shrink: 0; }
.hp-hero__search input {
  flex: 1; border: none; outline: none;
  font-size: 16px; color: var(--text); background: transparent;
  font-family: inherit;
}
.hp-hero__search input::placeholder { color: #9CA3AF; }
.hp-hero__search-hint {
  font-size: 12px; color: var(--muted); white-space: nowrap;
  padding: 2px 7px; background: #F3F6FB; border: 1px solid #D1D5DB;
  border-radius: 5px; font-family: inherit;
}
.hp-hero__tags {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px; margin-top: 22px; position: relative; z-index: 1;
}
.hp-hero__tag {
  padding: 6px 14px; background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.15); border-radius: 999px;
  font-size: 13px; font-weight: 500; color: rgba(255,255,255,.75);
  text-decoration: none; transition: background .15s, color .15s;
}
.hp-hero__tag:hover { background: rgba(255,255,255,.2); color: #fff; text-decoration: none; }

/* Quick start cards (overlap hero bottom) */
.hp-quick {
  max-width: var(--max); margin: -36px auto 0;
  padding: 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  position: relative; z-index: 2;
}
.hp-qcard {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-l); padding: 18px 20px;
  box-shadow: var(--shadow); text-decoration: none;
  display: flex; align-items: center; gap: 14px;
  transition: box-shadow .15s, transform .15s;
}
.hp-qcard:hover { box-shadow: var(--shadow-l); transform: translateY(-2px); text-decoration: none; }
.hp-qcard__icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: var(--blue-l); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--blue);
}
.hp-qcard__label { font-size: 11px; color: var(--muted); font-weight: 500; margin: 0 0 2px; }
.hp-qcard__title { font-size: 14px; font-weight: 700; color: var(--text); margin: 0; }

/* Category grid */
.hp-cats {
  max-width: var(--max); margin: 48px auto 64px; padding: 0 24px;
}
.hp-cats__heading {
  font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .09em; color: var(--muted); margin: 0 0 18px;
}
.hp-cats__group {
  grid-column: 1 / -1;
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .09em; color: var(--muted);
  margin: 24px 0 2px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.hp-cats__group:first-child { margin-top: 0; }
.hp-cats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
}
.hp-cat {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-l); padding: 22px 20px;
  text-decoration: none; color: var(--text); display: block;
  transition: box-shadow .15s, transform .15s, border-color .15s;
  box-shadow: var(--shadow-s);
}
.hp-cat:hover {
  box-shadow: var(--shadow); transform: translateY(-2px);
  border-color: #C0D4FF; text-decoration: none;
}
.hp-cat__icon {
  width: 40px; height: 40px;
  background: var(--blue-l); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--blue); margin-bottom: 14px;
}
.hp-cat__label { font-size: 11px; color: var(--muted); font-weight: 500; margin: 0 0 2px; display: block; }
.hp-cat h3 { font-size: 14px; font-weight: 700; margin: 0 0 6px; color: var(--text); line-height: 1.3; }
.hp-cat p { font-size: 12px; color: var(--muted); margin: 0 0 10px; line-height: 1.5; }
.hp-cat ul { margin: 0; padding-left: 14px; font-size: 12px; color: var(--muted); line-height: 1.9; }
.hp-cat__more {
  display: flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 600; color: var(--blue); margin-top: 12px;
}
.hp-cat--ai {
  background: linear-gradient(135deg, #F5F0FF 0%, #EEF4FF 100%);
  border-color: #C9B8FF;
}
.hp-cat--ai:hover { border-color: #9B7AFF; }
.hp-cat--ai .hp-cat__icon { background: #EDE0FF; color: #7C3AED; }
.hp-cat--ai .hp-cat__label { color: #7C3AED; }
.hp-cat--ai h3 { color: #4C1D95; }
.hp-cat--ai .hp-cat__more { color: #7C3AED; }

/* ── ARTICLE LAYOUT ── */
.article-shell {
  max-width: var(--max); margin: 0 auto; padding: 28px 24px 80px;
}
.article-layout {
  display: grid;
  grid-template-columns: var(--sbw) minmax(0, 1fr);
  gap: 24px; align-items: start;
}
.article-layout.three-col {
  grid-template-columns: var(--sbw) minmax(0, 1fr) var(--tocw);
}

/* ── SIDEBAR ── */
.sidebar {
  position: sticky; top: calc(var(--ac-nav-h) + 16px);
  height: calc(100vh - var(--ac-nav-h) - 32px);
  overflow-y: auto; padding: 0;
  background: transparent; border: none; box-shadow: none;
  scrollbar-width: thin; scrollbar-color: #D1D9ED transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: #D1D9ED; border-radius: 4px; }
.sb-section { margin-bottom: 4px; }
.sb-label {
  display: block; padding: 10px 10px 3px;
  font-size: 10.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em; color: var(--muted);
}
.sb-link {
  display: block; padding: 7px 10px;
  font-size: 13.5px; font-weight: 500; color: #374151;
  border-radius: 7px; text-decoration: none;
  border-left: 2px solid transparent;
  transition: background .12s, color .12s, border-color .12s;
}
.sb-link:hover {
  background: var(--blue-l); color: var(--blue);
  text-decoration: none; border-left-color: #B3C9FF;
}
.sb-link.is-active {
  background: var(--blue-l); color: var(--blue);
  font-weight: 700; border-left-color: var(--blue);
}

/* ── TOC ── */
.toc-card {
  position: sticky; top: calc(var(--ac-nav-h) + 16px);
  background: transparent; border: none; box-shadow: none; padding: 0;
}
.toc-card h4 {
  margin: 0 0 8px; font-size: 11px; text-transform: uppercase;
  letter-spacing: .08em; color: var(--muted); font-weight: 700; padding: 0 4px;
}
.toc-card nav { display: flex; flex-direction: column; gap: 1px; }
.toc-card a {
  display: block; padding: 6px 10px; font-size: 13px; color: var(--muted);
  border-radius: 6px; text-decoration: none;
  border-left: 2px solid #E2EAF6;
  transition: background .12s, color .12s, border-color .12s;
}
.toc-card a:hover { background: var(--blue-l); color: var(--blue); text-decoration: none; }
.toc-card a.is-active { color: var(--blue); border-left-color: var(--blue); font-weight: 600; }

/* ── DOC CONTENT ── */
.doc {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-l); overflow: hidden; box-shadow: var(--shadow-s);
}
.doc-header {
  padding: 32px 36px 20px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #fff 0%, #F7F9FC 100%);
}
.breadcrumbs {
  display: flex; gap: 6px; flex-wrap: wrap; align-items: center;
  font-size: 13px; color: var(--muted); margin-bottom: 12px;
}
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--blue); }
.breadcrumbs span { color: #D1D5DB; font-size: 11px; }
.doc-header h1 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.2vw, 36px);
  letter-spacing: -.03em; line-height: 1.1;
  color: var(--text); font-weight: 800;
}
.doc-header > p { margin: 0; color: var(--muted); max-width: 72ch; font-size: 15px; }
.doc-body { padding: 8px 36px 36px; }
.doc-section { padding: 26px 0; border-bottom: 1px solid #EDF2F8; }
.doc-section:last-child { border-bottom: 0; }
.doc-section h2 {
  margin: 0 0 14px; font-size: 20px; font-weight: 700;
  letter-spacing: -.02em; color: var(--text);
  scroll-margin-top: calc(var(--ac-nav-h) + 16px);
}
.doc-section h3 { margin: 20px 0 10px; font-size: 16px; font-weight: 700; color: var(--text); }
.doc-section p { margin: 0 0 14px; color: #374151; }
.doc-section ul, .doc-section ol { margin: 0 0 14px 18px; color: #374151; }
.doc-section li { margin-bottom: 6px; }

/* Callouts */
.callout {
  display: flex; gap: 12px; border-radius: 10px; padding: 13px 16px;
  margin: 16px 0; border-left: 3px solid var(--blue);
  background: var(--blue-l); color: #1A3A9C;
}
.callout.warn { background: #FFFBEB; border-left-color: #F59E0B; color: #92400E; }
.callout.success { background: #ECFDF5; border-left-color: #10B981; color: #065F46; }
.callout.danger { background: #FEF2F2; border-left-color: #EF4444; color: #991B1B; }
.callout.tip { background: #F5F3FF; border-left-color: #8B5CF6; color: #4C1D95; }

/* Code */
.code {
  background: #0D1117; color: #E6EDF3; border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; font-size: 13px; line-height: 1.7;
  border: 1px solid rgba(255,255,255,.06);
}

/* Figures */
.figure-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 16px 0; }
.figure { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: #fff; }
.figure figcaption {
  padding: 10px 14px; color: var(--muted); font-size: 13px;
  border-top: 1px solid var(--border);
}

/* Meta + check grids */
.meta-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 16px 0; }
.meta-item {
  background: #F9FBFF; border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px;
}
.meta-item strong { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
.meta-item span { font-size: 17px; font-weight: 700; color: var(--text); }
.check-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 14px 0; }
.check { background: #F9FBFF; border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.check strong { display: block; margin-bottom: 6px; font-size: 14px; }

/* Article links (next steps) */
.article-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 16px; }
.article-link {
  border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px;
  background: #FAFCFF; text-decoration: none; color: var(--text); display: block;
  transition: box-shadow .15s, transform .15s, border-color .15s;
}
.article-link:hover {
  box-shadow: var(--shadow); transform: translateY(-1px);
  border-color: #C0D4FF; text-decoration: none;
}
.article-link strong { display: block; margin-bottom: 4px; font-size: 14px; font-weight: 700; }
.article-link span { font-size: 13px; color: var(--muted); }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-card {
  background: #fff; border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-s);
}
.gallery-card img { width: 100%; aspect-ratio: 16/10; object-fit: contain; background: #fff; }
.gallery-card .caption { padding: 10px 14px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--border); }

/* ── Product module badge (doc header) ── */
.doc-module {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 10px 0 0; padding: 5px 12px 5px 8px;
  background: var(--blue-l); border-radius: 999px;
  font-size: 12px; font-weight: 700; color: var(--blue);
  text-decoration: none; border: 1px solid #D0E1FF;
}
.doc-module svg { flex-shrink: 0; }
.doc-module-sep { width: 1px; height: 12px; background: #B3C9FF; }
.doc-module-sub { font-weight: 400; color: #4060B0; font-size: 11.5px; }

/* ── Module grid (getting-started architecture) ── */
.module-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 14px; margin-top: 18px;
}
.module-card {
  background: #F9FBFF; border: 1px solid var(--border);
  border-radius: 12px; padding: 16px 18px;
}
.module-card--ai {
  background: linear-gradient(135deg, #EEF4FF 0%, #F5F0FF 100%);
  border-color: #C0BAFF;
}
.module-card__tag {
  display: inline-block; padding: 3px 10px;
  background: var(--blue-l); border-radius: 999px;
  font-size: 11px; font-weight: 700; color: var(--blue); margin-bottom: 10px;
}
.module-card--ai .module-card__tag {
  background: #EDE9FE; color: #5B21B6;
}
.module-card h3 { margin: 0 0 6px; font-size: 14px; font-weight: 700; }
.module-card p { margin: 0; font-size: 13px; color: var(--muted); line-height: 1.55; }

/* Backward-compat card grid (docs/index.html overview page) */
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-l); padding: 20px; box-shadow: var(--shadow-s);
  transition: box-shadow .15s, transform .15s, border-color .15s;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); border-color: #C0D4FF; }
.card h3 { margin: 0 0 8px; font-size: 16px; color: var(--text); font-weight: 700; }
.card p { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.card ul { margin: 0; padding-left: 16px; color: var(--muted); font-size: 13px; }
.card h3 a { color: var(--text); font-weight: 700; }
.card h3 a:hover { color: var(--blue); text-decoration: none; }

/* Section heading for docs overview */
.section { padding: 24px 0 8px; }
.section-header { margin-bottom: 16px; }
.section-header h2 { margin: 0 0 6px; font-size: 24px; font-weight: 700; letter-spacing: -.02em; }
.section-header p { margin: 0; color: var(--muted); }
.container { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; }

/* ── RESPONSIVE ── */
@media (max-width: 1200px) {
  .article-layout.three-col { grid-template-columns: var(--sbw) minmax(0, 1fr); }
  .toc-card { display: none; }
}
@media (max-width: 960px) {
  .hp-cats__grid { grid-template-columns: repeat(2, 1fr); }
  .hp-quick { grid-template-columns: 1fr 1fr 1fr; }
  .dh__tabs { display: none; }
  .dh__search-bar { display: none; }
  .dh__burger { display: flex; }
}
@media (max-width: 760px) {
  .article-layout, .article-layout.three-col { grid-template-columns: 1fr; }
  .sidebar {
    position: relative; top: 0; height: auto;
    background: #fff; border: 1px solid var(--border);
    border-radius: var(--r-l); padding: 14px 16px; margin-bottom: 16px;
  }
  .figure-grid, .meta-list, .article-links, .check-grid { grid-template-columns: 1fr; }
  .hp-quick { grid-template-columns: 1fr; }
  .hp-cats__grid { grid-template-columns: 1fr 1fr; }
  .doc-header { padding: 24px 20px 16px; }
  .doc-body { padding: 8px 20px 28px; }
  .article-shell { padding: 16px 16px 60px; }
  .card-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hp-hero { padding: 48px 16px 76px; }
  .hp-hero__title { font-size: 30px; }
  .hp-cats__grid { grid-template-columns: 1fr; }
  .hp-quick { gap: 10px; }
}

/* ── HOMEPAGE — SDAL FLOW SECTION ── */
.hp-sdal {
  max-width: var(--max); margin: 48px auto 0; padding: 0 24px;
}
.hp-sdal__heading {
  font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .09em; color: var(--muted); margin: 0 0 18px;
}
.hp-sdal__flow {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 14px;
}
.hp-sdal__step {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--r-l); padding: 22px 20px;
  box-shadow: var(--shadow-s);
  display: flex; flex-direction: column; gap: 10px;
  transition: box-shadow .15s, transform .15s, border-color .15s;
}
.hp-sdal__step:hover {
  box-shadow: var(--shadow); transform: translateY(-2px);
  border-color: #C0D4FF;
}
.hp-sdal__icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.hp-sdal__icon--sense  { background: #EEF4FF; color: #0050FF; }
.hp-sdal__icon--decide { background: #ECFDF5; color: #059669; }
.hp-sdal__icon--act    { background: #FFFBEB; color: #D97706; }
.hp-sdal__icon--learn  { background: #F5F3FF; color: #7C3AED; }
.hp-sdal__num { font-size: 10px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0; }
.hp-sdal__name { font-size: 14px; font-weight: 800; color: var(--text); margin: 0; }
.hp-sdal__desc { font-size: 12px; color: var(--muted); line-height: 1.55; flex: 1; margin: 0; }
.hp-sdal__more-link {
  display: block; margin-top: 4px; font-size: 12px; font-weight: 600;
  color: var(--blue); text-decoration: none;
}
.hp-sdal__more-link:hover { text-decoration: underline; }

/* ── HOMEPAGE — MENTAL MODEL TEASER ── */
.hp-mental {
  background: #050D1F; margin: 56px 0 0;
  padding: 52px 24px;
}
.hp-mental__inner { max-width: var(--max); margin: 0 auto; }
.hp-mental__eyebrow {
  font-size: 11px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: rgba(255,255,255,.35); margin-bottom: 10px;
}
.hp-mental__title {
  font-size: clamp(20px,2.5vw,28px); font-weight: 800;
  color: #fff; margin: 0 0 28px; letter-spacing: -.02em;
}
.hp-mental__grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin-bottom: 28px;
}
.hp-mental__card {
  padding: 20px; border-radius: 12px;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}
.hp-mental__card-from {
  font-size: 12px; color: rgba(255,255,255,.35); margin-bottom: 8px;
  display: flex; align-items: center; gap: 6px;
}
.hp-mental__card-from s { color: rgba(255,255,255,.25); }
.hp-mental__card-to {
  font-size: 14px; font-weight: 700; color: #fff; line-height: 1.35;
}
.hp-mental__cta {
  font-size: 14px; font-weight: 600; color: #7faaff;
  text-decoration: none;
}
.hp-mental__cta:hover { color: #fff; text-decoration: underline; }

@media (max-width: 860px) {
  .hp-sdal__flow { grid-template-columns: 1fr 1fr; }
  .hp-mental__grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .hp-sdal__flow { grid-template-columns: 1fr; }
}

/* ============================================================
   .dsec — Preview + Progressive Reveal section card
   Heading + 1-2 line summary + 2-3 bullet preview always visible.
   Detailed content sits inside a <details> toggle ("View details" /
   "Hide details"). Used on doc pages for sections beyond the intro.
   ============================================================ */
.dsec {
  border-top: 1px solid var(--border);
  padding: 24px 0 20px;
  margin: 0;
  scroll-margin-top: calc(var(--ac-nav-h, 72px) + 16px);
}
.dsec:first-of-type { border-top: none; padding-top: 4px; }
.dsec__title {
  font-size: 18px; font-weight: 700; letter-spacing: -.005em;
  color: var(--text); margin: 0 0 8px;
}
.dsec__summary {
  font-size: 14.5px; line-height: 1.6; color: var(--muted);
  margin: 0 0 12px;
}
.dsec__preview {
  list-style: none; padding: 0; margin: 0 0 14px;
  display: flex; flex-direction: column; gap: 6px;
}
.dsec__preview li {
  position: relative; padding-left: 18px;
  font-size: 13.5px; line-height: 1.5; color: var(--text);
}
.dsec__preview li::before {
  content: ''; position: absolute; left: 4px; top: 9px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--blue);
}
.dsec__more { margin-top: 4px; }
.dsec__more > summary {
  list-style: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 999px;
  background: var(--blue-l); color: var(--blue);
  border: 1px solid rgba(0,80,255,.18);
  font-size: 12.5px; font-weight: 700; letter-spacing: .01em;
  transition: background .15s, border-color .15s;
  user-select: none;
}
.dsec__more > summary::-webkit-details-marker { display: none; }
.dsec__more > summary::after {
  content: 'View details \2193'; /* ↓ */
  display: inline;
}
.dsec__more > summary > * { display: none; } /* hide any inline summary text — pseudo controls label */
.dsec__more[open] > summary::after { content: 'Hide details \2191'; /* ↑ */ }
.dsec__more > summary:hover { background: #E6EEFF; border-color: rgba(0,80,255,.32); }
.dsec__body {
  margin-top: 16px; padding-top: 16px;
  border-top: 1px dashed rgba(5,13,31,.1);
  font-size: 14px; line-height: 1.7; color: var(--text);
}
.dsec__body p { margin: 0 0 12px; }
.dsec__body p:last-child { margin-bottom: 0; }
.dsec__body ul, .dsec__body ol { padding-left: 20px; margin: 0 0 12px; }

@media (max-width: 600px) {
  .dsec { padding: 20px 0 16px; }
  .dsec__title { font-size: 17px; }
  .dsec__summary { font-size: 14px; }
}