:root {
  --bg: #05070c;
  --bg-2: #0b1220;
  --bg-3: #121a2b;
  --card: rgba(18, 28, 48, 0.72);
  --line: rgba(80, 140, 255, 0.18);
  --text: #e8eefc;
  --muted: #93a0bc;
  --blue: #3b82f6;
  --blue-2: #1d4ed8;
  --blue-glow: rgba(59, 130, 246, 0.35);
  --black: #000;
  --ok: #34d399;
  --danger: #f87171;
  --radius: 18px;
  --font: "Segoe UI", "Trebuchet MS", "Manrope", system-ui, sans-serif;
  --display: "Segoe UI Semibold", "Trebuchet MS", "Manrope", system-ui, sans-serif;
  --header-h: 64px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(37, 99, 235, 0.28), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(14, 165, 233, 0.12), transparent 50%),
    linear-gradient(180deg, #05070c 0%, #070b14 45%, #05070c 100%);
  min-height: 100vh;
  min-height: 100dvh;
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }

a { color: #93c5fd; text-decoration: none; }
a:hover { color: #bfdbfe; }

.wrap {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(5, 7, 12, 0.92);
  border-bottom: 1px solid var(--line);
  padding-top: var(--safe-top);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: var(--header-h);
  padding: 0.55rem 0;
  position: relative;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
  min-width: 0;
}
.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px var(--line), 0 8px 24px rgba(0,0,0,.45);
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.7);
  padding: 0;
  margin: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: #dbeafe;
}
.nav-links {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid transparent;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  border-color: var(--line);
  background: rgba(59, 130, 246, 0.12);
}

.hero {
  padding: 4.5rem 0 2.5rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
}
.hero .hero-badge { order: 2; }
.hero .hero-copy { order: 1; }
.hero-copy h1 {
  font-family: var(--display);
  font-size: clamp(2.2rem, 8vw, 4.2rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}
.hero-copy p {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.85rem 1.2rem;
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: .15s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-2));
  color: white;
  box-shadow: 0 10px 30px var(--blue-glow);
}
.btn-primary:hover { filter: brightness(1.08); color: white; }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(59,130,246,.1); }
.btn-tg {
  background: #0f172a;
  border-color: rgba(59,130,246,.35);
  color: #dbeafe;
}

.hero-badge {
  justify-self: end;
  width: min(280px, 100%);
  aspect-ratio: 1;
  background: transparent;
  border: 0;
  box-shadow: none;
  display: grid;
  place-items: center;
  overflow: visible;
}
.hero-badge img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 28px;
  display: block;
}

.section {
  padding: 2.5rem 0 3.5rem;
}
.section h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 4vw, 1.7rem);
  letter-spacing: -0.02em;
}
.section .lead {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  backdrop-filter: blur(8px);
}
.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}
.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.95rem;
}
.card .icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 0.85rem;
  background: linear-gradient(135deg, rgba(59,130,246,.35), rgba(29,78,216,.2));
  color: #bfdbfe;
  font-weight: 700;
}

.contact-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.25rem 1.4rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(29,78,216,.25), rgba(5,7,12,.4));
}
.contact-strip strong { display: block; margin-bottom: 0.2rem; }
.contact-strip span { color: var(--muted); }

.doc-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: start;
  padding: 2rem 0 calc(3rem + var(--safe-bottom));
}
.doc-layout-guide {
  grid-template-columns: 320px 1fr;
}

.doc-side {
  position: sticky;
  top: calc(var(--header-h) + var(--safe-top) + 12px);
  align-self: start;
  z-index: 5;
  max-height: calc(100dvh - var(--header-h) - var(--safe-top) - 24px);
  overflow: auto;
  overscroll-behavior: contain;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  /* opaque — no ghosting over chapters while sticky */
  background: #0a1220;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(96,165,250,.35) transparent;
}
.doc-side::-webkit-scrollbar { width: 6px; }
.doc-side::-webkit-scrollbar-track { background: transparent; }
.doc-side::-webkit-scrollbar-thumb {
  background: rgba(96,165,250,.35);
  border-radius: 999px;
}
.doc-side-guide {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 0.85rem;
}
.doc-side h2,
.mobile-toc summary span:first-child {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}
.doc-side .intro {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.75rem 0 1rem;
  line-height: 1.45;
}
.doc-side .sec-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: #60a5fa;
  text-shadow: 0 0 14px rgba(59,130,246,.35);
  margin: 1.2rem 0 0.4rem;
}
.search-caption[hidden],
.settings-results[hidden] { display: none !important; }
.doc-side a {
  display: block;
  color: var(--muted);
  padding: 0.55rem 0.55rem;
  border-radius: 8px;
  font-size: 0.92rem;
  min-height: 40px;
}
.doc-side a:hover { background: rgba(59,130,246,.12); color: var(--text); }

.mobile-toc {
  border: 0;
  margin: 0;
  padding: 0;
}
.mobile-toc > summary {
  list-style: none;
  cursor: default;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}
.mobile-toc > summary::-webkit-details-marker { display: none; }
.toc-hint {
  display: none;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.guide-search {
  flex: 0 0 auto;
  margin: 0;
  padding: 0.85rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #071018;
}
.search-label {
  display: block;
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #64748b;
}
.guide-search input[type=search] {
  width: 100%;
  background: #020617;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  font: inherit;
  font-size: 16px; /* avoid iOS zoom */
  min-height: 44px;
}
.guide-search input[type=search]:focus {
  outline: none;
  border-color: rgba(59,130,246,.55);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}
.search-caption {
  margin: 0.75rem 0 0.4rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #64748b;
}
.settings-results {
  max-height: min(28vh, 220px);
  overflow: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding-right: 2px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(96,165,250,.4) rgba(2,6,23,.6);
}
.settings-results::-webkit-scrollbar { width: 5px; }
.settings-results::-webkit-scrollbar-track {
  background: rgba(2,6,23,.6);
  border-radius: 999px;
}
.settings-results::-webkit-scrollbar-thumb {
  background: rgba(96,165,250,.45);
  border-radius: 999px;
}
.settings-hit {
  padding: 0.55rem 0.6rem;
  border-radius: 10px;
  border: 1px solid rgba(59,130,246,.18);
  background: #0f1a2c;
}
.settings-hit-btn {
  display: block;
  width: 100%;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}
.settings-hit-btn:hover,
.settings-hit-btn:focus-visible {
  border-color: rgba(96,165,250,.55);
  background: #132238;
  outline: none;
}
.settings-guide-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 0.35rem;
}
.settings-path {
  font-size: 0.78rem;
  line-height: 1.35;
  color: #93c5fd;
  overflow-wrap: anywhere;
  opacity: 0.9;
}
.settings-path + .settings-path { margin-top: 0.15rem; }
.settings-hint {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.35;
}
.search-banner {
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  border: 1px dashed var(--line);
  border-radius: 12px;
}

.doc-main {
  min-width: 0;
  position: relative;
  z-index: 1;
}
.doc-main .chapter {
  margin-bottom: 1.5rem;
  padding: 1.35rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #0b1220;
  scroll-margin-top: calc(var(--header-h) + var(--safe-top) + 16px);
}
.doc-main h3 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.1rem, 4vw, 1.25rem);
}
.prose { color: #d5def0; line-height: 1.65; overflow-wrap: anywhere; }
.prose h1, .prose h2, .prose h3 { color: var(--text); }
.prose a { text-decoration: underline; }
.prose img { max-width: 100%; height: auto; border-radius: 12px; }
.prose ol, .prose ul { padding-left: 1.25rem; }
.prose code {
  background: #0b1220;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
  word-break: break-word;
}
.prose pre {
  overflow: auto;
  background: #020617;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  -webkit-overflow-scrolling: touch;
}
.empty {
  color: var(--muted);
  padding: 2rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 calc(2rem + var(--safe-bottom));
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Admin */
.admin-body { background: #070b14; }
.admin-shell {
  width: min(1100px, calc(100% - 2rem));
  margin: 1.5rem auto calc(3rem + var(--safe-bottom));
}
.admin-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.flash {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  background: rgba(59,130,246,.12);
}
.flash.ok { border-color: rgba(52,211,153,.35); }
.login-box {
  width: min(420px, calc(100% - 2rem));
  margin: 12vh auto;
  padding: 1.75rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(11,18,32,.9);
}
.login-box h1 { margin-top: 0; }
label { display: block; margin: 0.85rem 0 0.35rem; color: var(--muted); font-size: 0.9rem; }
input[type=text], input[type=password], textarea, select {
  width: 100%;
  background: #020617;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font: inherit;
  font-size: 16px;
}
textarea { min-height: 280px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.form-row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; margin-top: 0.85rem; }
.admin-card {
  border: 1px solid var(--line);
  background: rgba(11,18,32,.75);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}
.admin-card h3 { margin: 0 0 0.75rem; }
.item-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  padding: 0.55rem 0;
  border-top: 1px solid rgba(148,163,184,.12);
  flex-wrap: wrap;
}
.item-row:first-of-type { border-top: 0; }
.item-row .grow { flex: 1; min-width: 0; }
.muted { color: var(--muted); }
.badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}
.badge.off { color: var(--danger); border-color: rgba(248,113,113,.35); }
.drag-handle {
  cursor: grab;
  color: #64748b;
  user-select: none;
  padding: 0 0.25rem;
}
.btn-danger {
  background: transparent;
  border-color: rgba(248,113,113,.4);
  color: #fecaca;
}
.btn-sm { padding: 0.55rem 0.8rem; font-size: 0.88rem; min-height: 40px; }
.split-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.preview-box {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  background: #020617;
  min-height: 280px;
  overflow: auto;
}
.error { color: var(--danger); }

/* Desktop: classic TOC, hide mobile index/sheet */
.guide-index { display: none; }
.chapter-sheet { display: none; }

@media (min-width: 901px) {
  .mobile-toc > summary {
    pointer-events: none;
    margin-bottom: 0.75rem;
  }
  .mobile-toc .toc-body { display: block !important; }
  .guide-index { display: none !important; }
  .chapter-sheet { display: none !important; }
}

@media (max-width: 900px) {
  .wrap { width: min(1100px, calc(100% - 1.25rem)); }
  .nav {
    overflow: visible;
  }
  .nav-toggle {
    display: inline-flex;
    position: relative;
    z-index: 120;
  }
  .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.75rem;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #070b14;
    box-shadow: 0 22px 60px rgba(0,0,0,.55);
    z-index: 200;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a {
    width: 100%;
    justify-content: flex-start;
    border-radius: 12px;
    min-height: 48px;
    background: rgba(15, 23, 42, 0.9);
  }
  body.nav-open::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.55);
    z-index: 90;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 1.5rem 0 1.25rem;
    gap: 0.85rem;
    text-align: center;
    justify-items: center;
  }
  .hero .hero-badge {
    order: 1;
    justify-self: center;
    width: min(160px, 44vw);
  }
  .hero .hero-copy {
    order: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
  }
  .hero-copy h1 {
    margin: 0.15rem 0 0.45rem;
  }
  .hero-kicker {
    margin: 0 0 0.9rem;
  }
  .hero-copy p {
    font-size: 1rem;
    margin-bottom: 1.1rem;
    text-align: center;
  }
  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.65rem;
    width: 100%;
  }
  .hero-actions .btn { width: 100%; }

  .section { padding: 1.5rem 0 2rem; }
  .grid { grid-template-columns: 1fr; gap: 0.75rem; }
  .card { padding: 1rem 1.05rem; }

  .contact-strip {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.05rem;
  }
  .contact-strip .btn { width: 100%; }

  .doc-layout,
  .doc-layout-guide {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    padding: 1rem 0 calc(2rem + var(--safe-bottom));
  }
  .settings-results { max-height: min(32vh, 180px); }

  .doc-side,
  .doc-side-guide {
    position: static;
    max-height: none;
    overflow: visible;
    width: 100%;
    padding: 0;
    border: 0;
    background: transparent;
    gap: 0.85rem;
  }

  /* No sticky search on mobile — scrolls with page */
  .guide-search {
    position: static;
    width: 100%;
    box-sizing: border-box;
    background: #071018;
    box-shadow: none;
  }

  .desktop-only-toc { display: none !important; }
  .guide-index {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    width: 100%;
  }
  .guide-index-intro {
    margin: 0;
    padding: 0.95rem 1rem;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #0a1220;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.45;
  }
  .guide-cat {
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #0a1220;
    overflow: hidden;
    width: 100%;
  }
  .guide-cat .sec-title {
    margin: 0;
    padding: 0.85rem 1rem 0.35rem;
    font-size: 0.95rem;
  }
  .guide-cat-items {
    display: flex;
    flex-direction: column;
    padding: 0.25rem 0.45rem 0.55rem;
  }
  .guide-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    min-height: 48px;
    padding: 0.75rem 0.7rem;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--text);
    font: inherit;
    font-size: 0.98rem;
    text-align: left;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }
  .guide-item:active,
  .guide-item:hover {
    background: rgba(59,130,246,.14);
  }
  .guide-item-chevron {
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid #93c5fd;
    border-bottom: 2px solid #93c5fd;
    transform: rotate(-45deg);
    flex-shrink: 0;
    opacity: 0.8;
  }

  /* Hide long chapter list on mobile — opened via sheet */
  .doc-layout-guide .doc-main {
    display: none;
  }

  .chapter-sheet {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    z-index: 300;
    background: #05070c;
    padding-top: var(--safe-top);
    padding-bottom: var(--safe-bottom);
    transform: translateY(110%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      transform .38s cubic-bezier(.22,1,.36,1),
      opacity .28s ease,
      visibility 0s linear .38s;
    will-change: transform, opacity;
  }
  .chapter-sheet.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition:
      transform .38s cubic-bezier(.22,1,.36,1),
      opacity .28s ease,
      visibility 0s;
  }
  .chapter-sheet[hidden] { display: none !important; }
  body.sheet-open { overflow: hidden; }
  .chapter-sheet-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--line);
    background: #070b14;
    min-height: 56px;
    transform: translateY(-8px);
    opacity: 0;
    transition: transform .35s ease .05s, opacity .3s ease .05s;
  }
  .chapter-sheet.is-open .chapter-sheet-bar {
    transform: none;
    opacity: 1;
  }
  .chapter-sheet-back {
    border: 1px solid var(--line);
    background: #0f172a;
    color: #dbeafe;
    border-radius: 10px;
    padding: 0.55rem 0.8rem;
    font: inherit;
    font-weight: 600;
    min-height: 40px;
    cursor: pointer;
  }
  .chapter-sheet-title {
    font-weight: 700;
    font-size: 1rem;
    line-height: 1.3;
    min-width: 0;
  }
  .chapter-sheet-body {
    flex: 1;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1.1rem 1.05rem 1.5rem;
    transform: translateY(18px);
    opacity: 0;
    transition: transform .4s cubic-bezier(.22,1,.36,1) .08s, opacity .35s ease .08s;
  }
  .chapter-sheet.is-open .chapter-sheet-body {
    transform: none;
    opacity: 1;
  }

  .site-footer .wrap { flex-direction: column; gap: 0.4rem; }
  .split-2 { grid-template-columns: 1fr; }
  .admin-top .nav-links {
    position: static;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    border: 0;
    background: transparent;
    box-shadow: none;
    padding: 0;
  }
  .admin-top .nav-links a {
    width: auto;
    min-height: 36px;
    padding: 0.4rem 0.7rem;
  }
  .item-row { align-items: flex-start; }
}

@media (max-width: 480px) {
  .brand span { font-size: 1.05rem; }
  .brand img { width: 36px; height: 36px; border-radius: 10px; }
  .hero-copy h1 { font-size: clamp(2rem, 11vw, 2.6rem); }
  .prose { font-size: 0.95rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .mobile-toc > summary::after { transition: none; }
}