/* ==========================================================================
   23vin.cfd — viewport responsive base stylesheet
   File: css/viewport-responsive-966412.css
   Every class and variable carries the surface4121d- prefix.
   Palette: #FFAA00 amber | #0097A7 teal | #1E1E1E ink | #00695C deep | #48D1CC mint
   Canvas strategy: 320-430px phone canvas, centered on wide screens.
   ========================================================================== */

/* ---------- design tokens ---------- */
:root {
  --surface4121d-ink: #1e1e1e;
  --surface4121d-night: #101211;
  --surface4121d-panel: #202423;
  --surface4121d-panel-2: #182020;
  --surface4121d-deep: #00695c;
  --surface4121d-teal: #0097a7;
  --surface4121d-mint: #48d1cc;
  --surface4121d-amber: #ffaa00;
  --surface4121d-text: #edf7f5;
  --surface4121d-dim: #a9c2bf;
  --surface4121d-line: rgba(72, 209, 204, 0.2);
  --surface4121d-font-body: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --surface4121d-font-display: 'Anton', 'Be Vietnam Pro', system-ui, sans-serif;
  --surface4121d-top-h: 56px;
  --surface4121d-dock-h: 64px;
  --surface4121d-gutter: 12px;
}

/* ---------- reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

html,
body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  background: radial-gradient(120% 60% at 50% 0%, #16302c 0%, var(--surface4121d-night) 58%, #0b0d0c 100%);
  color: var(--surface4121d-text);
  font-family: var(--surface4121d-font-body);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--surface4121d-mint);
  text-decoration: none;
}

a:hover {
  color: var(--surface4121d-amber);
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
p {
  margin: 0 0 10px;
  overflow-wrap: anywhere;
}

h1,
h2 {
  font-family: var(--surface4121d-font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.22;
  color: var(--surface4121d-text);
}

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--surface4121d-amber);
  outline-offset: 2px;
}

/* ---------- phone canvas ---------- */
.surface4121d-canvas {
  position: relative;
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  min-height: 100vh;
  background: linear-gradient(180deg, #1a1d1c 0%, #151817 40%, #121413 100%);
  box-shadow: 0 0 44px rgba(0, 0, 0, 0.55);
  overflow-x: clip;
}

/* ---------- fixed topbar: brand left, actions right ---------- */
.surface4121d-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: var(--surface4121d-top-h);
  padding: 0 var(--surface4121d-gutter);
  background: rgba(20, 24, 23, 0.96);
  border-bottom: 1px solid var(--surface4121d-line);
  backdrop-filter: blur(8px);
}

.surface4121d-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.surface4121d-brand-logo {
  width: 34px;
  height: 34px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid rgba(255, 170, 0, 0.55);
  flex: none;
}

.surface4121d-brand-name {
  font-family: var(--surface4121d-font-display);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--surface4121d-amber);
  white-space: nowrap;
}

.surface4121d-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: none;
}

/* square-corner, high contrast CTAs */
.surface4121d-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: filter 0.15s ease, transform 0.15s ease;
}

.surface4121d-btn:hover {
  filter: brightness(1.12);
}

.surface4121d-btn:active {
  transform: translateY(1px);
}

.surface4121d-btn-amber {
  background: var(--surface4121d-amber);
  color: #191400;
  border-color: #c76f00;
}

.surface4121d-btn-ghost {
  background: transparent;
  color: var(--surface4121d-mint);
  border-color: var(--surface4121d-teal);
}

.surface4121d-btn-wide {
  width: 100%;
}

.surface4121d-menu-btn {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 10px 9px;
  background: var(--surface4121d-deep);
  border: 1px solid var(--surface4121d-teal);
  border-radius: 2px;
}

.surface4121d-menu-strip {
  display: block;
  height: 2px;
  background: var(--surface4121d-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- sectioned menu page ---------- */
.surface4121d-menu {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 50%;
  z-index: 80;
  width: 100%;
  max-width: 430px;
  padding: 0 var(--surface4121d-gutter) 24px;
  background: linear-gradient(180deg, #14201e 0%, #101615 100%);
  border-right: 1px solid var(--surface4121d-line);
  border-left: 1px solid var(--surface4121d-line);
  overflow-y: auto;
  transform: translate(-50%, -102%);
  transition: transform 0.28s ease;
  visibility: hidden;
}

.surface4121d-menu-open {
  transform: translate(-50%, 0);
  visibility: visible;
}

.surface4121d-menu-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: var(--surface4121d-top-h);
  border-bottom: 1px solid var(--surface4121d-line);
  margin-bottom: 14px;
}

.surface4121d-menu-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--surface4121d-font-display);
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--surface4121d-text);
}

.surface4121d-menu-brand img {
  width: 28px;
  height: 28px;
  border-radius: 5px;
  object-fit: cover;
}

.surface4121d-menu-close {
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--surface4121d-teal);
  border-radius: 2px;
  color: var(--surface4121d-mint);
  font-size: 20px;
  line-height: 1;
}

.surface4121d-menu-zone {
  margin-bottom: 16px;
  padding: 10px 12px;
  background: rgba(0, 105, 92, 0.14);
  border: 1px solid var(--surface4121d-line);
  border-radius: 8px;
}

.surface4121d-zone-title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--surface4121d-amber);
}

.surface4121d-menu-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 12px;
  margin-bottom: 6px;
  border-radius: 4px;
  background: rgba(29, 34, 33, 0.9);
  color: var(--surface4121d-text);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease;
}

.surface4121d-menu-link:last-child {
  margin-bottom: 0;
}

.surface4121d-menu-link:hover {
  background: rgba(0, 151, 167, 0.28);
  color: var(--surface4121d-amber);
}

.surface4121d-menu-on {
  background: var(--surface4121d-deep);
  color: var(--surface4121d-amber);
  font-weight: 700;
}

.surface4121d-veil {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(8, 10, 9, 0.72);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.surface4121d-veil-on {
  opacity: 1;
  visibility: visible;
}

/* ---------- main column ---------- */
.surface4121d-main {
  padding: 14px var(--surface4121d-gutter) calc(var(--surface4121d-dock-h) + 40px);
}

/* ---------- hero ---------- */
.surface4121d-hero {
  padding: 14px 12px 16px;
  background:
    linear-gradient(150deg, rgba(0, 105, 92, 0.55) 0%, rgba(30, 30, 30, 0.2) 62%),
    repeating-linear-gradient(135deg, rgba(72, 209, 204, 0.05) 0 10px, transparent 10px 20px);
  border: 1px solid var(--surface4121d-line);
  border-left: 4px solid var(--surface4121d-amber);
  border-radius: 10px;
}

.surface4121d-hero-kicker {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: rgba(255, 170, 0, 0.14);
  border: 1px solid rgba(255, 170, 0, 0.5);
  border-radius: 2px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--surface4121d-amber);
}

.surface4121d-hero-title {
  font-size: clamp(27px, 7.6vw, 36px);
  margin-bottom: 10px;
}

.surface4121d-hero-text {
  color: var(--surface4121d-dim);
  font-size: 14px;
}

.surface4121d-hero-cta {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.surface4121d-hero-cta .surface4121d-btn {
  flex: 1;
}

/* ---------- banner carousel ---------- */
.surface4121d-carousel {
  position: relative;
  margin-top: 14px;
}

.surface4121d-track {
  position: relative;
  height: clamp(150px, 44vw, 196px);
  overflow: hidden;
  border-radius: 10px;
  border: 1px solid var(--surface4121d-line);
  touch-action: pan-y;
}

.surface4121d-slide {
  position: absolute;
  inset: 0;
  display: block;
  opacity: 0;
  transform: translateX(6%);
  transition: opacity 0.4s ease, transform 0.4s ease;
  pointer-events: none;
}

.surface4121d-slide-on {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.surface4121d-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.surface4121d-slide-cap {
  position: absolute;
  left: 10px;
  bottom: 10px;
  right: 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  background: rgba(10, 14, 13, 0.78);
  border-left: 3px solid var(--surface4121d-amber);
  border-radius: 4px;
}

.surface4121d-slide-cap strong {
  font-family: var(--surface4121d-font-display);
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--surface4121d-amber);
}

.surface4121d-slide-cap em {
  font-style: normal;
  font-size: 11.5px;
  color: var(--surface4121d-text);
}

.surface4121d-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.surface4121d-dot {
  width: 26px;
  height: 8px;
  padding: 0;
  background: rgba(72, 209, 204, 0.25);
  border: 1px solid var(--surface4121d-teal);
  border-radius: 2px;
}

.surface4121d-dot-on {
  background: var(--surface4121d-amber);
  border-color: var(--surface4121d-amber);
}

/* ---------- generic section shell ---------- */
.surface4121d-section {
  margin-top: 26px;
}

.surface4121d-sec-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  padding-left: 10px;
  border-left: 4px solid var(--surface4121d-amber);
}

.surface4121d-sec-title {
  font-size: 20px;
  margin: 0;
}

.surface4121d-sec-tag {
  flex: none;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--surface4121d-mint);
  white-space: nowrap;
}

/* conclusion-first lead line */
.surface4121d-lead {
  padding: 8px 10px;
  background: rgba(255, 170, 0, 0.09);
  border-left: 3px solid var(--surface4121d-amber);
  border-radius: 0 6px 6px 0;
  color: var(--surface4121d-text);
  font-size: 13.5px;
  font-weight: 500;
}

.surface4121d-section > p:not(.surface4121d-lead) {
  font-size: 13.5px;
  color: var(--surface4121d-dim);
}

/* ---------- game grid: mixed large + small cards ---------- */
.surface4121d-ggrid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

@media (min-width: 400px) {
  .surface4121d-ggrid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.surface4121d-gitem {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 0;
  padding: 6px 5px;
  background: linear-gradient(180deg, rgba(0, 105, 92, 0.32), rgba(24, 28, 27, 0.94));
  border: 1px solid var(--surface4121d-line);
  border-radius: 10px;
  color: var(--surface4121d-text);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.surface4121d-gitem:hover {
  border-color: var(--surface4121d-amber);
  color: var(--surface4121d-text);
}

.surface4121d-gitem:active {
  transform: scale(0.97);
}

.surface4121d-gthumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  background: #0e100f;
  transition: filter 0.16s ease;
}

.surface4121d-gitem:hover .surface4121d-gthumb {
  filter: brightness(1.12);
}

.surface4121d-gname {
  font-size: 10.5px;
  font-weight: 600;
  line-height: 1.3;
  text-align: center;
  color: var(--surface4121d-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* feature card spanning two tracks */
.surface4121d-gitem-big {
  grid-column: span 2;
  flex-direction: row;
  gap: 8px;
  padding: 8px;
  background: linear-gradient(120deg, rgba(255, 170, 0, 0.16), rgba(0, 105, 92, 0.4) 55%, rgba(24, 28, 27, 0.95));
  border-color: rgba(255, 170, 0, 0.55);
}

.surface4121d-gitem-big .surface4121d-gthumb {
  width: 74px;
  flex: none;
}

.surface4121d-gitem-big .surface4121d-gname {
  font-size: 12.5px;
  color: var(--surface4121d-amber);
  -webkit-line-clamp: 3;
  text-align: left;
}

/* ---------- module: achievements milestones ---------- */
.surface4121d-milestones {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}

.surface4121d-milestone {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  align-items: start;
  padding: 10px;
  background: rgba(0, 105, 92, 0.16);
  border: 1px solid var(--surface4121d-line);
  border-radius: 10px;
}

.surface4121d-milestone-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--surface4121d-deep);
  border: 1px solid var(--surface4121d-teal);
  border-radius: 2px;
  font-family: var(--surface4121d-font-display);
  font-size: 18px;
  color: var(--surface4121d-mint);
}

.surface4121d-milestone h3 {
  margin: 0 0 2px;
  font-size: 14px;
  font-weight: 700;
  color: var(--surface4121d-amber);
}

.surface4121d-milestone p {
  margin: 0;
  font-size: 13px;
  color: var(--surface4121d-dim);
}

/* ---------- module: what is the site ---------- */
.surface4121d-panel {
  padding: 14px 12px;
  background:
    linear-gradient(160deg, rgba(0, 151, 167, 0.2), rgba(16, 18, 17, 0.6)),
    var(--surface4121d-panel-2);
  border: 1px solid var(--surface4121d-line);
  border-radius: 10px;
}

.surface4121d-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-fact {
  padding: 8px 10px;
  background: rgba(30, 30, 30, 0.75);
  border: 1px solid var(--surface4121d-line);
  border-radius: 6px;
}

.surface4121d-fact strong {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--surface4121d-mint);
  margin-bottom: 2px;
}

.surface4121d-fact span {
  font-size: 12.5px;
  color: var(--surface4121d-text);
}

/* ---------- module: category comparison rows ---------- */
.surface4121d-compare {
  margin-top: 12px;
  border: 1px solid var(--surface4121d-line);
  border-radius: 10px;
  overflow: hidden;
}

.surface4121d-cmp {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: center;
  min-height: 46px;
  padding: 8px 10px;
  background: rgba(24, 28, 27, 0.85);
  border-bottom: 1px solid rgba(72, 209, 204, 0.12);
}

.surface4121d-cmp:last-child {
  border-bottom: none;
}

.surface4121d-cmp:nth-child(odd) {
  background: rgba(0, 105, 92, 0.14);
}

.surface4121d-cmp-cat {
  font-family: var(--surface4121d-font-display);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--surface4121d-amber);
}

.surface4121d-cmp-txt {
  font-size: 12.5px;
  color: var(--surface4121d-dim);
}

/* ---------- module: app download ---------- */
.surface4121d-appbox {
  margin-top: 12px;
  padding: 12px;
  background: linear-gradient(165deg, rgba(0, 105, 92, 0.42), rgba(20, 24, 23, 0.95));
  border: 1px solid rgba(72, 209, 204, 0.35);
  border-radius: 10px;
}

.surface4121d-appshot {
  width: 100%;
  height: 132px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--surface4121d-line);
  margin-bottom: 12px;
}

.surface4121d-steps {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.surface4121d-step {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 8px;
  align-items: start;
  font-size: 13px;
  color: var(--surface4121d-dim);
}

.surface4121d-step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--surface4121d-amber);
  border-radius: 2px;
  font-family: var(--surface4121d-font-display);
  font-size: 14px;
  color: var(--surface4121d-amber);
}

/* ---------- module: security checklist ---------- */
.surface4121d-checklist {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-check {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 10px;
  background: rgba(30, 30, 30, 0.72);
  border: 1px solid var(--surface4121d-line);
  border-radius: 10px;
}

.surface4121d-check-ico {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: rgba(255, 170, 0, 0.12);
  border: 1px solid rgba(255, 170, 0, 0.5);
  border-radius: 2px;
  color: var(--surface4121d-amber);
}

.surface4121d-check h3 {
  margin: 0 0 2px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--surface4121d-mint);
}

.surface4121d-check p {
  margin: 0;
  font-size: 12.5px;
  color: var(--surface4121d-dim);
}

/* ---------- module: use case cards ---------- */
.surface4121d-cases {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.surface4121d-case {
  padding: 10px 12px;
  background: linear-gradient(120deg, rgba(0, 105, 92, 0.24), rgba(24, 28, 27, 0.92));
  border: 1px solid var(--surface4121d-line);
  border-left: 4px solid var(--surface4121d-teal);
  border-radius: 10px;
}

.surface4121d-case:nth-child(2) {
  border-left-color: var(--surface4121d-mint);
}

.surface4121d-case:nth-child(3) {
  border-left-color: var(--surface4121d-amber);
}

.surface4121d-case h3 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--surface4121d-amber);
}

.surface4121d-case p {
  margin: 0;
  font-size: 13px;
  color: var(--surface4121d-dim);
}

.surface4121d-paynote {
  margin-top: 12px;
  padding: 10px 12px;
  background: rgba(0, 151, 167, 0.12);
  border: 1px dashed rgba(72, 209, 204, 0.45);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--surface4121d-dim);
}

/* ---------- homepage extended footer ---------- */
.surface4121d-ext {
  margin-top: 30px;
  padding: 14px 12px 16px;
  background: linear-gradient(180deg, rgba(0, 105, 92, 0.3), rgba(16, 18, 17, 0.96));
  border: 1px solid var(--surface4121d-line);
  border-top: 3px solid var(--surface4121d-amber);
  border-radius: 10px;
}

.surface4121d-ext-brand {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--surface4121d-dim);
}

.surface4121d-ext-logo {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid rgba(255, 170, 0, 0.5);
  flex: none;
}

/* two-column page directory */
.surface4121d-dir {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.surface4121d-dir-col {
  min-width: 0;
}

.surface4121d-dir-title {
  margin: 0 0 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--surface4121d-amber);
}

.surface4121d-dir-link {
  display: block;
  padding: 7px 8px;
  margin-bottom: 4px;
  background: rgba(30, 30, 30, 0.72);
  border-radius: 4px;
  font-size: 12.5px;
  color: var(--surface4121d-text);
  transition: background 0.15s ease, color 0.15s ease;
}

.surface4121d-dir-link:hover {
  background: rgba(0, 151, 167, 0.3);
  color: var(--surface4121d-amber);
}

/* four promotion actions */
.surface4121d-ext-promos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.surface4121d-ext-promos .surface4121d-btn {
  width: 100%;
}

.surface4121d-ext-promos .surface4121d-btn-amber + .surface4121d-btn-ghost + .surface4121d-btn-amber {
  grid-column: span 1;
}

.surface4121d-ext-note {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid rgba(72, 209, 204, 0.15);
  font-size: 11.5px;
  color: var(--surface4121d-dim);
}

/* ---------- universal footer ---------- */
.surface4121d-footer {
  padding: 16px var(--surface4121d-gutter) calc(var(--surface4121d-dock-h) + 26px);
  text-align: center;
  border-top: 1px solid var(--surface4121d-line);
}

.surface4121d-footer p {
  margin: 0 0 4px;
  font-size: 12px;
  color: var(--surface4121d-dim);
}

.surface4121d-footer p:first-child {
  font-weight: 600;
  color: var(--surface4121d-text);
}

/* ---------- fixed bottom dock: full-width rail ---------- */
.surface4121d-dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  background: rgba(13, 17, 16, 0.97);
  border-top: 2px solid var(--surface4121d-deep);
  padding-bottom: env(safe-area-inset-bottom, 0);
  backdrop-filter: blur(8px);
}

.surface4121d-dock-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  max-width: 430px;
  margin: 0 auto;
  height: var(--surface4121d-dock-h);
}

.surface4121d-dock-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  margin: 6px 5px;
  min-height: 44px;
  border-radius: 6px;
  color: var(--surface4121d-dim);
  transition: background 0.18s ease, color 0.18s ease;
}

.surface4121d-dock-item:hover {
  color: var(--surface4121d-mint);
}

.surface4121d-dock-ico {
  display: block;
  transition: transform 0.18s ease;
}

/* active state: background block + label reveal */
.surface4121d-dock-on {
  background: var(--surface4121d-deep);
  color: var(--surface4121d-amber);
}

.surface4121d-dock-on .surface4121d-dock-ico {
  transform: translateY(-1px) scale(1.08);
}

.surface4121d-dock-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--surface4121d-dim);
  transition: color 0.18s ease, font-weight 0.18s ease;
}

.surface4121d-dock-on .surface4121d-dock-label,
.surface4121d-dock-item:hover .surface4121d-dock-label {
  color: var(--surface4121d-amber);
  font-weight: 700;
}

/* ---------- small helpers ---------- */
.surface4121d-sronly {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* wide-screen frame: keep the phone canvas readable */
@media (min-width: 431px) {
  body {
    padding: 0 0 32px;
  }

  .surface4121d-canvas {
    min-height: calc(100vh - 32px);
  }
}

/* ---------- help pages: measured guidance blocks ---------- */
.surface4121d-help-hero {
  padding: 16px 14px 18px;
  background:
    linear-gradient(145deg, rgba(0, 151, 167, 0.28), rgba(0, 105, 92, 0.12)),
    repeating-linear-gradient(90deg, rgba(255, 170, 0, 0.06) 0 1px, transparent 1px 18px);
  border: 1px solid var(--surface4121d-line);
  border-top: 3px solid var(--surface4121d-amber);
  border-radius: 0 0 12px 12px;
}

.surface4121d-help-kicker {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--surface4121d-mint);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.surface4121d-help-title {
  margin-bottom: 9px;
  font-size: clamp(26px, 7.2vw, 34px);
}

.surface4121d-help-intro {
  margin-bottom: 0;
  color: var(--surface4121d-dim);
  font-size: 14px;
}

.surface4121d-help-answer {
  margin: 10px 0 0;
  padding: 10px 12px;
  background: rgba(255, 170, 0, 0.1);
  border-left: 3px solid var(--surface4121d-amber);
  border-radius: 0 7px 7px 0;
  color: var(--surface4121d-text);
  font-size: 13.5px;
  font-weight: 600;
}

.surface4121d-help-copy {
  color: var(--surface4121d-dim);
  font-size: 13.5px;
}

.surface4121d-help-copy strong {
  color: var(--surface4121d-text);
}

.surface4121d-help-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-help-actions .surface4121d-btn {
  width: 100%;
}

.surface4121d-help-flow {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  counter-reset: surface4121d-flow;
}

.surface4121d-help-flow li {
  position: relative;
  padding: 10px 10px 10px 42px;
  background: rgba(0, 105, 92, 0.18);
  border: 1px solid var(--surface4121d-line);
  border-radius: 8px;
  color: var(--surface4121d-dim);
  font-size: 13px;
}

.surface4121d-help-flow li::before {
  position: absolute;
  left: 10px;
  top: 9px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  counter-increment: surface4121d-flow;
  content: counter(surface4121d-flow);
  background: var(--surface4121d-deep);
  border: 1px solid var(--surface4121d-teal);
  color: var(--surface4121d-amber);
  font-weight: 800;
}

.surface4121d-help-flow strong {
  display: block;
  margin-bottom: 2px;
  color: var(--surface4121d-text);
}

.surface4121d-help-table {
  display: grid;
  gap: 7px;
  margin-top: 12px;
}

.surface4121d-help-row {
  display: grid;
  grid-template-columns: minmax(86px, 0.75fr) minmax(0, 1.25fr);
  gap: 8px;
  padding: 9px 10px;
  background: rgba(24, 28, 27, 0.9);
  border-left: 3px solid var(--surface4121d-teal);
  border-radius: 5px;
}

.surface4121d-help-row:nth-child(even) {
  border-left-color: var(--surface4121d-mint);
  background: rgba(0, 105, 92, 0.16);
}

.surface4121d-help-row strong {
  color: var(--surface4121d-amber);
  font-size: 12px;
}

.surface4121d-help-row span {
  color: var(--surface4121d-dim);
  font-size: 12.5px;
}

.surface4121d-help-branch {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-help-branch article {
  padding: 10px 12px;
  background: linear-gradient(120deg, rgba(0, 151, 167, 0.16), rgba(24, 28, 27, 0.9));
  border: 1px solid var(--surface4121d-line);
  border-radius: 9px;
}

.surface4121d-help-branch h3 {
  margin-bottom: 3px;
  color: var(--surface4121d-mint);
  font-size: 14px;
}

.surface4121d-help-branch p {
  margin: 0;
  color: var(--surface4121d-dim);
  font-size: 12.8px;
}

.surface4121d-faq-stack {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-faq-item {
  padding: 0 10px;
  background: rgba(24, 28, 27, 0.88);
  border: 1px solid var(--surface4121d-line);
  border-radius: 8px;
}

.surface4121d-faq-item summary {
  min-height: 44px;
  padding: 11px 20px 11px 0;
  color: var(--surface4121d-text);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 700;
}

.surface4121d-faq-item summary::marker {
  color: var(--surface4121d-amber);
}

.surface4121d-faq-item p {
  margin: 0 0 11px;
  color: var(--surface4121d-dim);
  font-size: 13px;
}

.surface4121d-faq-item[open] {
  border-color: rgba(255, 170, 0, 0.55);
}

.surface4121d-checkline {
  display: grid;
  gap: 7px;
  margin-top: 12px;
}

.surface4121d-checkline li {
  position: relative;
  padding: 8px 10px 8px 30px;
  background: rgba(0, 105, 92, 0.16);
  color: var(--surface4121d-dim);
  font-size: 13px;
}

.surface4121d-checkline li::before {
  position: absolute;
  left: 10px;
  content: "✓";
  color: var(--surface4121d-amber);
  font-weight: 800;
}

.surface4121d-brief {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.surface4121d-brief dt {
  color: var(--surface4121d-mint);
  font-size: 12px;
  font-weight: 700;
}

.surface4121d-brief dd {
  margin: -5px 0 0;
  padding: 8px 10px;
  background: rgba(30, 30, 30, 0.72);
  color: var(--surface4121d-dim);
  font-size: 12.8px;
}

/* honor reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}