/* ==========================================================================
   bongdanet.homes - shell-native-1f685a.css
   Mobile-first canvas 320-430px, centered phone shell on wide screens.
   Class prefix: surface685ac-   Design direction: geometric headings with a
   neutral body face, near-square tool corners, horizontal icon-name game
   bars, step-driven information rhythm, motion budget spent on key CTAs only.
   Palette: #0D1117 bg / #AFEEEE text / #00CED1 accent / #C0C0C0 muted /
   #1E90FF link accent.
   ========================================================================== */

:root {
  --surface685ac-ink: #0D1117;
  --surface685ac-ink-deep: #07090D;
  --surface685ac-panel: #101823;
  --surface685ac-panel-alt: #0B0F15;
  --surface685ac-line: #223145;
  --surface685ac-line-soft: #1A2736;
  --surface685ac-cyan: #00CED1;
  --surface685ac-pale: #AFEEEE;
  --surface685ac-silver: #C0C0C0;
  --surface685ac-blue: #1E90FF;
  --surface685ac-dim: #8FA3B8;
  --surface685ac-radius: 4px;
  --surface685ac-radius-lg: 6px;
  --surface685ac-head-font: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --surface685ac-body-font: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --surface685ac-topbar-h: 52px;
  --surface685ac-dock-h: 60px;
}

/* ---------- base ---------- */

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface685ac-ink-deep);
  color: var(--surface685ac-silver);
  font-family: var(--surface685ac-body-font);
  font-size: 13px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--surface685ac-head-font);
  color: var(--surface685ac-pale);
  letter-spacing: -0.01em;
}

img { max-width: 100%; }

a { color: var(--surface685ac-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  font-family: var(--surface685ac-body-font);
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--surface685ac-cyan);
  outline-offset: 2px;
  border-radius: 2px;
}

/* screen-reader helper */
.surface685ac-vis {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- phone shell ---------- */

.surface685ac-shell {
  position: relative;
  max-width: 430px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--surface685ac-ink);
  border-left: 1px solid var(--surface685ac-line-soft);
  border-right: 1px solid var(--surface685ac-line-soft);
  box-shadow: 0 0 44px rgba(0, 206, 209, 0.06);
}

/* ---------- fixed tab-style top bar ---------- */

.surface685ac-topbar {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: var(--surface685ac-topbar-h);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  background: rgba(13, 17, 23, 0.96);
  border-bottom: 1px solid var(--surface685ac-line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.surface685ac-brand {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
  flex: 0 1 auto;
}

.surface685ac-logo {
  width: 30px;
  height: 30px;
  border-radius: var(--surface685ac-radius);
  border: 1px solid var(--surface685ac-line);
  display: block;
  object-fit: cover;
  background: var(--surface685ac-panel-alt);
}

.surface685ac-brandName {
  font-family: var(--surface685ac-head-font);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--surface685ac-pale);
  white-space: nowrap;
}

.surface685ac-topActs {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* compact dual-button group + menu trigger */
.surface685ac-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 44px;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--surface685ac-radius);
  border: 1px solid var(--surface685ac-line);
  background: transparent;
  color: var(--surface685ac-silver);
  transition: transform 0.12s ease, background-color 0.12s ease;
}

.surface685ac-btnCta {
  background: var(--surface685ac-cyan);
  border-color: var(--surface685ac-cyan);
  color: #04262B;
  font-weight: 700;
}

.surface685ac-btnGhost {
  background: rgba(30, 144, 255, 0.08);
  border-color: rgba(30, 144, 255, 0.55);
  color: var(--surface685ac-pale);
}

.surface685ac-btnCta:active,
.surface685ac-btnGhost:active {
  transform: scale(0.95); /* quick scale feedback, key CTAs only */
}

.surface685ac-menuBtn {
  width: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--surface685ac-line);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-pale);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
}

.surface685ac-menuBtn svg { display: block; }
.surface685ac-menuBtn:active { transform: scale(0.94); }

/* ---------- expandable navigation drawer ---------- */

.surface685ac-drawer {
  position: fixed;
  top: var(--surface685ac-topbar-h);
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  z-index: 55;
  max-height: 0;
  overflow: hidden;
  background: rgba(11, 15, 21, 0.98);
  border-bottom: 0 solid transparent;
  transition: max-height 0.26s ease;
}

.surface685ac-drawerOpen {
  max-height: 460px;
  border-bottom-width: 1px;
  border-bottom-color: var(--surface685ac-line);
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.45);
}

.surface685ac-drawerGrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 10px;
}

.surface685ac-drawerLink {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-silver);
  font-size: 12px;
  font-weight: 500;
  background: var(--surface685ac-panel);
}

.surface685ac-drawerLink:hover { text-decoration: none; color: var(--surface685ac-pale); }

.surface685ac-drawerLink::before {
  /* top indicator line for the active route */
  content: '';
  position: absolute;
  top: 0;
  left: 8px;
  right: 8px;
  height: 2px;
  background: transparent;
}

.surface685ac-drawerLink.surface685ac-on {
  color: var(--surface685ac-pale);
  border-color: rgba(0, 206, 209, 0.5);
}

.surface685ac-drawerLink.surface685ac-on::before { background: var(--surface685ac-cyan); }

.surface685ac-drawerLink svg { flex: 0 0 auto; color: var(--surface685ac-cyan); }
.surface685ac-drawerNote {
  grid-column: 1 / -1;
  margin: 0;
  padding: 6px 10px 4px;
  font-size: 10.5px;
  color: var(--surface685ac-dim);
}

/* ---------- sticky category tab rail ---------- */

.surface685ac-tabrail {
  position: sticky;
  top: var(--surface685ac-topbar-h);
  z-index: 40;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 8px 12px;
  background: var(--surface685ac-ink);
  border-bottom: 1px solid var(--surface685ac-line-soft);
  scrollbar-width: none;
}

.surface685ac-tabrail::-webkit-scrollbar { display: none; }

.surface685ac-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 36px;
  padding: 0 12px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--surface685ac-dim);
  background: transparent;
  border: 1px solid var(--surface685ac-line);
  border-radius: var(--surface685ac-radius);
  white-space: nowrap;
}

.surface685ac-tab:active { transform: scale(0.96); }

.surface685ac-tab.surface685ac-tabOn {
  color: var(--surface685ac-pale);
  border-color: var(--surface685ac-cyan);
  background: rgba(0, 206, 209, 0.1);
}

.surface685ac-tabDot {
  width: 6px;
  height: 6px;
  background: var(--surface685ac-cyan);
  border-radius: 1px;
}

/* ---------- main column ---------- */

.surface685ac-main {
  padding: 10px 0 calc(var(--surface685ac-dock-h) + 30px);
}

.surface685ac-helpMain {
  padding-top: calc(var(--surface685ac-topbar-h) + 10px);
}

.surface685ac-main > * { scroll-margin-top: calc(var(--surface685ac-topbar-h) + 46px); }

/* ---------- H1 opening block ---------- */

.surface685ac-h1Block {
  margin: 14px 12px 0;
}

.surface685ac-h1Block h1 {
  margin: 0;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 800;
}

.surface685ac-h1Lead {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--surface685ac-silver);
}

@media (min-width: 430px) {
  .surface685ac-h1Block h1 { font-size: 20.5px; }
}

/* ---------- hero carousel ---------- */

.surface685ac-hero {
  position: relative;
  margin: 10px 12px 4px;
  border: 1px solid var(--surface685ac-line);
  border-radius: var(--surface685ac-radius-lg);
  overflow: hidden;
  background: var(--surface685ac-panel-alt);
}

.surface685ac-heroTrack {
  display: flex;
  transition: transform 0.45s ease;
  will-change: transform;
}

.surface685ac-heroSlide {
  flex: 0 0 100%;
  position: relative;
  display: block;
}

.surface685ac-heroGo {
  display: block;
  color: inherit;
}

.surface685ac-heroGo:hover { text-decoration: none; }
.surface685ac-heroGo:active { opacity: 0.85; }

.surface685ac-heroImg {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--surface685ac-panel-alt);
}

.surface685ac-heroCap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 12px 12px;
  background: linear-gradient(180deg, rgba(13, 17, 23, 0) 0%, rgba(13, 17, 23, 0.88) 55%, rgba(13, 17, 23, 0.96) 100%);
}

.surface685ac-heroTitle {
  margin: 0;
  font-family: var(--surface685ac-head-font);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.35;
  color: var(--surface685ac-pale);
}

.surface685ac-heroSub {
  margin: 3px 0 0;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--surface685ac-silver);
}

.surface685ac-heroCtas {
  display: flex;
  gap: 8px;
  margin-top: 9px;
}

.surface685ac-heroCtas .surface685ac-btn { flex: 1 1 50%; padding: 0 8px; }

.surface685ac-dots {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
}

.surface685ac-dot {
  width: 22px;
  height: 22px;
  padding: 0;
  border: 0;
  background: transparent;
  display: grid;
  place-items: center;
}

.surface685ac-dot::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: rgba(175, 238, 238, 0.45);
  border: 1px solid rgba(175, 238, 238, 0.6);
}

.surface685ac-dot.surface685ac-dotOn::after {
  background: var(--surface685ac-cyan);
  border-color: var(--surface685ac-cyan);
}

/* ---------- horizontal icon-name pick bars ---------- */

.surface685ac-pickRow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.surface685ac-pickBar {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 60px;
  padding: 7px 9px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-silver);
}

.surface685ac-pickBar:active { transform: scale(0.97); }
.surface685ac-pickBar:hover { text-decoration: none; border-color: rgba(0, 206, 209, 0.45); }

.surface685ac-pickIcon {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border-radius: 3px;
  border: 1px solid var(--surface685ac-line-soft);
  object-fit: cover;
  display: block;
  background: var(--surface685ac-panel-alt);
}

.surface685ac-pickName {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.35;
  color: var(--surface685ac-silver);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.surface685ac-pickArrow {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  color: var(--surface685ac-cyan);
}

/* ---------- section scaffolding ---------- */

.surface685ac-sec {
  margin: 20px 12px 0;
}

.surface685ac-secHead {
  display: flex;
  align-items: center;
  gap: 8px;
}

.surface685ac-secNo {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-family: var(--surface685ac-head-font);
  font-weight: 800;
  font-size: 11px;
  color: #04262B;
  background: var(--surface685ac-cyan);
  border-radius: 3px;
}

.surface685ac-secHead h2 {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-size: 15px;
  line-height: 1.35;
  font-weight: 700;
}

.surface685ac-count {
  flex: 0 0 auto;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--surface685ac-dim);
  border: 1px solid var(--surface685ac-line);
  border-radius: 3px;
  padding: 3px 6px;
  white-space: nowrap;
}

.surface685ac-secIntro {
  margin: 8px 0 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--surface685ac-silver);
}

.surface685ac-secIntro a,
.surface685ac-prose a,
.surface685ac-answer a {
  color: var(--surface685ac-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}

/* ---------- game tile grid ---------- */

.surface685ac-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px 6px;
}

.surface685ac-tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 5px 5px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-silver);
}

.surface685ac-tile:hover {
  text-decoration: none;
  border-color: rgba(0, 206, 209, 0.5);
  color: var(--surface685ac-pale);
}

.surface685ac-tile:active { transform: scale(0.96); }

.surface685ac-tileFrame {
  display: block;
  border-radius: 3px;
  overflow: hidden;
  background: var(--surface685ac-panel-alt);
}

.surface685ac-tileImg {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.surface685ac-tileName {
  font-size: 11px;
  line-height: 1.3;
  text-align: center;
  min-height: 2.6em;
  color: var(--surface685ac-silver);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* related internal links under each hall */
.surface685ac-related {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.surface685ac-relatedLink {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 44px;
  padding: 8px 11px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--surface685ac-pale);
  background: rgba(30, 144, 255, 0.08);
  border: 1px solid rgba(30, 144, 255, 0.45);
  border-radius: var(--surface685ac-radius);
}

.surface685ac-relatedLink:hover { text-decoration: none; background: rgba(30, 144, 255, 0.16); }
.surface685ac-relatedLink svg { width: 13px; height: 13px; color: var(--surface685ac-blue); }

/* ---------- feature spec sheet ---------- */

.surface685ac-spec {
  border: 1px solid var(--surface685ac-line);
  border-radius: var(--surface685ac-radius-lg);
  overflow: hidden;
  background: var(--surface685ac-panel);
}

.surface685ac-specRow {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 10px;
  padding: 10px 12px;
  border-top: 1px solid var(--surface685ac-line-soft);
}

.surface685ac-specRow:first-child { border-top: 0; }

.surface685ac-specKey {
  font-family: var(--surface685ac-head-font);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--surface685ac-cyan);
  align-self: start;
  padding-top: 2px;
}

.surface685ac-specVal {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--surface685ac-silver);
}

/* ---------- hall fit rows (category highlights) ---------- */

.surface685ac-fitRow {
  display: block;
  padding: 10px 12px;
  margin-top: 8px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line-soft);
  border-left: 3px solid var(--surface685ac-cyan);
  border-radius: var(--surface685ac-radius);
}

.surface685ac-fitTag {
  display: inline-block;
  font-family: var(--surface685ac-head-font);
  font-size: 12px;
  font-weight: 700;
  color: var(--surface685ac-pale);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.surface685ac-fitBody {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--surface685ac-silver);
}

.surface685ac-fitBody strong { color: var(--surface685ac-pale); font-weight: 600; }

/* ---------- step rail (selection criteria) ---------- */

.surface685ac-steps {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  counter-reset: surface685ac-step;
}

.surface685ac-steps li {
  counter-increment: surface685ac-step;
  position: relative;
  padding: 11px 12px 11px 46px;
  margin-top: 8px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  font-size: 12.5px;
  line-height: 1.6;
}

.surface685ac-steps li::before {
  content: counter(surface685ac-step);
  position: absolute;
  left: 11px;
  top: 11px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-family: var(--surface685ac-head-font);
  font-weight: 800;
  font-size: 12px;
  color: #04262B;
  background: var(--surface685ac-cyan);
  border-radius: 3px;
}

.surface685ac-steps strong { color: var(--surface685ac-pale); font-weight: 600; }

/* ---------- direct answer panel ---------- */

.surface685ac-answer {
  margin-top: 10px;
  padding: 13px 14px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line);
  border-left: 3px solid var(--surface685ac-blue);
  border-radius: var(--surface685ac-radius-lg);
}

.surface685ac-answerLead {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--surface685ac-pale);
}

.surface685ac-prose {
  margin: 9px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--surface685ac-silver);
}

.surface685ac-prose:last-child { margin-bottom: 0; }

/* ---------- extended footer (page directory / brand / promotions / note) ---------- */

.surface685ac-xfoot {
  margin: 26px 12px 0;
  padding-top: 16px;
  border-top: 1px solid var(--surface685ac-line);
}

.surface685ac-xTitle {
  margin: 0 0 10px;
  font-family: var(--surface685ac-head-font);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--surface685ac-cyan);
}

.surface685ac-dirGrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.surface685ac-dirItem {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 8px 10px;
  background: var(--surface685ac-panel);
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-silver);
}

.surface685ac-dirItem:hover {
  text-decoration: none;
  border-color: rgba(0, 206, 209, 0.5);
  color: var(--surface685ac-pale);
}

.surface685ac-dirItem svg { flex: 0 0 auto; width: 17px; height: 17px; color: var(--surface685ac-cyan); }

.surface685ac-dirText { min-width: 0; display: flex; flex-direction: column; gap: 1px; }

.surface685ac-dirLabel {
  font-size: 11.5px;
  font-weight: 600;
  color: inherit;
  line-height: 1.3;
}

.surface685ac-dirSub {
  font-size: 10px;
  line-height: 1.3;
  color: var(--surface685ac-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.surface685ac-brandBlk {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--surface685ac-dim);
}

.surface685ac-promoList {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.surface685ac-promoItem {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  padding: 10px 12px;
  width: 100%;
  text-align: left;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--surface685ac-pale);
  background: rgba(0, 206, 209, 0.07);
  border: 1px solid rgba(0, 206, 209, 0.4);
  border-radius: var(--surface685ac-radius);
  transition: transform 0.12s ease, background-color 0.12s ease;
}

.surface685ac-promoItem svg { flex: 0 0 auto; width: 17px; height: 17px; color: var(--surface685ac-cyan); }
.surface685ac-promoItem span em { font-style: normal; color: var(--surface685ac-silver); font-weight: 400; }
.surface685ac-promoItem:active { transform: scale(0.97); background: rgba(0, 206, 209, 0.14); }

.surface685ac-disclaim {
  margin: 14px 0 0;
  padding: 10px 12px;
  border: 1px dashed var(--surface685ac-line);
  border-radius: var(--surface685ac-radius);
  font-size: 10.5px;
  line-height: 1.6;
  color: var(--surface685ac-dim);
}

/* ---------- copyright bar ---------- */

.surface685ac-credit {
  margin: 18px 12px 0;
  padding: 12px 0 4px;
  border-top: 1px solid var(--surface685ac-line-soft);
  text-align: center;
  font-size: 11px;
  color: var(--surface685ac-dim);
}

.surface685ac-credit strong { color: var(--surface685ac-silver); font-weight: 600; }

/* ---------- fixed floating dock (mobile bottom nav) ---------- */

.surface685ac-dock {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  z-index: 60;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: calc(var(--surface685ac-dock-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: rgba(11, 15, 21, 0.97);
  border-top: 1px solid rgba(0, 206, 209, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.surface685ac-dockItem {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-height: 44px;
  color: var(--surface685ac-dim);
  font-family: var(--surface685ac-body-font);
  background: transparent;
  border: 0;
  padding: 4px 2px 6px;
}

.surface685ac-dockItem:active { transform: scale(0.92); }

.surface685ac-dockItem::before {
  /* active route indicator line */
  content: '';
  position: absolute;
  top: 0;
  left: 22%;
  right: 22%;
  height: 2px;
  background: transparent;
}

.surface685ac-dockItem.surface685ac-on { color: var(--surface685ac-pale); }
.surface685ac-dockItem.surface685ac-on::before { background: var(--surface685ac-cyan); }

.surface685ac-dockIcon { width: 21px; height: 21px; display: block; }
.surface685ac-dockLabel { font-size: 9.5px; font-weight: 600; letter-spacing: 0.02em; line-height: 1; }

a.surface685ac-dockItem:hover,
button.surface685ac-dockItem:hover { text-decoration: none; }

/* ---------- 430px breakpoint: widen tile grid inside the phone canvas ---------- */

@media (min-width: 430px) {
  body { font-size: 13.5px; }

  .surface685ac-grid { grid-template-columns: repeat(5, 1fr); gap: 8px 7px; }

  .surface685ac-heroTitle { font-size: 16.5px; }
  .surface685ac-heroSub { font-size: 12px; }

  .surface685ac-secHead h2 { font-size: 16px; }
  .surface685ac-dirGrid { gap: 8px; }
  .surface685ac-promoList { grid-template-columns: 1fr 1fr; }
}

/* ---------- help-page reading tools ---------- */

.surface685ac-pageIntro {
  margin: 12px;
  padding: 14px;
  border: 1px solid var(--surface685ac-line);
  border-top: 3px solid var(--surface685ac-cyan);
  background: linear-gradient(135deg, rgba(0, 206, 209, 0.11), var(--surface685ac-panel) 52%, var(--surface685ac-panel-alt));
  border-radius: var(--surface685ac-radius-lg);
}

.surface685ac-pageIntro h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
}

.surface685ac-pageIntro p {
  margin: 7px 0 0;
  color: var(--surface685ac-silver);
  font-size: 12.5px;
  line-height: 1.7;
}

.surface685ac-actionRail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 11px;
}

.surface685ac-actionRail .surface685ac-btn { width: 100%; }

.surface685ac-routeList {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  counter-reset: surface685ac-route;
}

.surface685ac-routeItem {
  counter-increment: surface685ac-route;
  position: relative;
  margin-top: 8px;
  padding: 11px 12px 11px 46px;
  border-left: 2px solid var(--surface685ac-cyan);
  background: var(--surface685ac-panel);
  border-top: 1px solid var(--surface685ac-line-soft);
  border-right: 1px solid var(--surface685ac-line-soft);
  border-bottom: 1px solid var(--surface685ac-line-soft);
  border-radius: 0 var(--surface685ac-radius) var(--surface685ac-radius) 0;
  font-size: 12.5px;
  line-height: 1.65;
}

.surface685ac-routeItem::before {
  content: counter(surface685ac-route, decimal-leading-zero);
  position: absolute;
  left: 10px;
  top: 11px;
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: #04262B;
  background: var(--surface685ac-cyan);
  border-radius: 2px;
  font-family: var(--surface685ac-head-font);
  font-size: 10px;
  font-weight: 800;
}

.surface685ac-routeItem strong,
.surface685ac-branchTitle,
.surface685ac-compareKey { color: var(--surface685ac-pale); font-weight: 700; }

.surface685ac-promoStrip {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  margin-top: 10px;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.surface685ac-promoStrip::-webkit-scrollbar { display: none; }
.surface685ac-promoChip {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 8px 11px;
  border: 1px solid rgba(0, 206, 209, 0.45);
  border-radius: var(--surface685ac-radius);
  color: var(--surface685ac-pale);
  background: rgba(0, 206, 209, 0.08);
  font-size: 11.5px;
  font-weight: 600;
}

.surface685ac-promoChip:hover { text-decoration: none; background: rgba(0, 206, 209, 0.16); }
.surface685ac-branchGrid,
.surface685ac-caseGrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 10px;
}

.surface685ac-branch,
.surface685ac-case {
  min-width: 0;
  padding: 11px;
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  background: var(--surface685ac-panel);
}

.surface685ac-branch p,
.surface685ac-case p {
  margin: 5px 0 0;
  color: var(--surface685ac-silver);
  font-size: 11.5px;
  line-height: 1.6;
}

.surface685ac-branchTitle { display: block; font-size: 12px; line-height: 1.35; }

.surface685ac-compare {
  margin-top: 10px;
  border: 1px solid var(--surface685ac-line);
  border-radius: var(--surface685ac-radius-lg);
  overflow: hidden;
  background: var(--surface685ac-panel);
}

.surface685ac-compareRow {
  display: grid;
  grid-template-columns: 0.88fr 1.32fr;
  gap: 9px;
  padding: 10px 11px;
  border-top: 1px solid var(--surface685ac-line-soft);
  font-size: 11.5px;
  line-height: 1.55;
}

.surface685ac-compareRow:first-child { border-top: 0; }
.surface685ac-compareKey { color: var(--surface685ac-cyan); font-size: 10.5px; letter-spacing: 0.04em; text-transform: uppercase; }
.surface685ac-compareVal { color: var(--surface685ac-silver); }

.surface685ac-alert {
  margin-top: 10px;
  padding: 11px 12px;
  border: 1px solid rgba(30, 144, 255, 0.55);
  border-left: 3px solid var(--surface685ac-blue);
  border-radius: var(--surface685ac-radius);
  background: rgba(30, 144, 255, 0.08);
  color: var(--surface685ac-pale);
  font-size: 12px;
  line-height: 1.65;
}

.surface685ac-alert strong { color: var(--surface685ac-cyan); }

.surface685ac-payRail {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 7px;
  margin-top: 10px;
}

.surface685ac-payStep {
  padding: 11px 10px;
  border-top: 2px solid var(--surface685ac-cyan);
  border-right: 1px solid var(--surface685ac-line-soft);
  border-bottom: 1px solid var(--surface685ac-line-soft);
  border-left: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  background: var(--surface685ac-panel);
}

.surface685ac-payStep b { display: block; color: var(--surface685ac-pale); font-size: 12px; }
.surface685ac-payStep span { display: block; margin-top: 4px; color: var(--surface685ac-silver); font-size: 11.5px; line-height: 1.55; }

.surface685ac-defs { margin: 10px 0 0; }
.surface685ac-defs div { padding: 9px 0; border-top: 1px solid var(--surface685ac-line-soft); }
.surface685ac-defs div:first-child { border-top: 0; }
.surface685ac-defs dt { color: var(--surface685ac-cyan); font-size: 11.5px; font-weight: 700; }
.surface685ac-defs dd { margin: 3px 0 0; color: var(--surface685ac-silver); font-size: 12px; line-height: 1.6; }

.surface685ac-noteStack { display: grid; gap: 7px; margin-top: 10px; }
.surface685ac-note {
  padding: 10px 11px 10px 13px;
  border-left: 3px solid var(--surface685ac-cyan);
  border-radius: var(--surface685ac-radius);
  background: var(--surface685ac-panel);
  color: var(--surface685ac-silver);
  font-size: 12px;
  line-height: 1.6;
}

.surface685ac-note strong { color: var(--surface685ac-pale); }
.surface685ac-checklist { list-style: none; margin: 10px 0 0; padding: 0; }
.surface685ac-checklist li {
  position: relative;
  margin-top: 7px;
  padding: 10px 10px 10px 35px;
  border: 1px solid var(--surface685ac-line-soft);
  border-radius: var(--surface685ac-radius);
  background: var(--surface685ac-panel);
  color: var(--surface685ac-silver);
  font-size: 12px;
  line-height: 1.6;
}

.surface685ac-checklist li::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 13px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--surface685ac-cyan);
  border-radius: 2px;
  box-shadow: inset 0 0 0 2px var(--surface685ac-panel);
  background: var(--surface685ac-cyan);
}

.surface685ac-caseGrid .surface685ac-case { border-top: 2px solid var(--surface685ac-blue); }
.surface685ac-case b { color: var(--surface685ac-pale); font-size: 12px; }
.surface685ac-case p { margin-top: 5px; }

@media (max-width: 359px) {
  .surface685ac-topbar { gap: 4px; padding-left: 6px; padding-right: 6px; }
  .surface685ac-logo { width: 27px; height: 27px; }
  .surface685ac-brand { gap: 5px; }
  .surface685ac-brandName { font-size: 13px; }
  .surface685ac-topActs { gap: 3px; }
  .surface685ac-topActs .surface685ac-btn { padding-left: 7px; padding-right: 7px; font-size: 10px; }
  .surface685ac-menuBtn { width: 38px; }
  .surface685ac-branchGrid,
  .surface685ac-caseGrid { grid-template-columns: 1fr; }
  .surface685ac-pageIntro h1 { font-size: 18px; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .surface685ac-heroTrack { transition: none; }
  .surface685ac-drawer { transition: none; }
  .surface685ac-btn,
  .surface685ac-tile,
  .surface685ac-pickBar,
  .surface685ac-promoItem,
  .surface685ac-dockItem { transition: none; }
}