/* ==========================================================================
   Okey Game - dynamic viewport stylesheet
   Mobile canvas: 320-430px, centered on wide screens.
   Class prefix: ui40937-
   Palette: #FFAA00 (accent) | #F0F0F0 (light text) | #36454F | #778899 |
            #708090 | #2E4057 (deep base)
   Design tone: bold compact headings + light body, lightly rounded outlined
   tile cards, fact-strip-then-detail rhythm, segmented action buttons,
   monochrome icons with color-switch active states and soft transitions.
   ========================================================================== */

:root {
  --ui40937-amber: #FFAA00;
  --ui40937-amber-ink: #2E4057;
  --ui40937-amber-soft: rgba(255, 170, 0, 0.15);
  --ui40937-paper: #F0F0F0;
  --ui40937-paper-dim: rgba(240, 240, 240, 0.72);
  --ui40937-night: #2E4057;
  --ui40937-slab: #36454F;
  --ui40937-slate: #778899;
  --ui40937-steel: #708090;
  --ui40937-hairline: rgba(119, 136, 153, 0.4);
  --ui40937-void: #22303c;
  --ui40937-radius: 10px;
  --ui40937-radius-sm: 7px;
  --ui40937-top-h: 56px;
  --ui40937-tab-h: 60px;
  --ui40937-tap: 44px;
}

* { box-sizing: border-box; }

html {
  background: var(--ui40937-void);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ui40937-night);
  color: var(--ui40937-paper);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.62;
  max-width: 430px;
  margin-left: auto;
  margin-right: auto;
  min-height: 100vh;
  overflow-x: hidden;
}

body.ui40937-no-scroll { overflow: hidden; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: var(--ui40937-amber); text-decoration: none; }

a:hover, a:focus-visible { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--ui40937-amber);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ==========================================================================
   Fixed chrome: edge-aligned functional top bar, compact icon tab bar
   ========================================================================== */

.ui40937-topbar {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: var(--ui40937-top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 12px;
  background: rgba(46, 64, 87, 0.96);
  border-bottom: 1px solid var(--ui40937-hairline);
  z-index: 50;
}

.ui40937-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  color: var(--ui40937-paper);
}

.ui40937-brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--ui40937-hairline);
  object-fit: cover;
  flex: none;
}

.ui40937-brand-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

.ui40937-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}

/* Segmented action pair: joined buttons, compact rounding */
.ui40937-seg {
  display: flex;
  border: 1px solid var(--ui40937-amber);
  border-radius: var(--ui40937-radius-sm);
  overflow: hidden;
}

.ui40937-seg-btn {
  min-height: 34px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ui40937-amber);
  background: rgba(54, 69, 79, 0.9);
  transition: background-color 0.25s ease, color 0.25s ease;
}

.ui40937-seg-btn + .ui40937-seg-btn {
  border-left: 1px solid var(--ui40937-amber);
}

.ui40937-seg-btn--fill {
  background: var(--ui40937-amber);
  color: var(--ui40937-amber-ink);
}

.ui40937-seg-btn:active { filter: brightness(1.12); }

.ui40937-menu-btn {
  width: var(--ui40937-tap);
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  color: var(--ui40937-paper);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.ui40937-menu-btn:hover, .ui40937-menu-btn:focus-visible {
  color: var(--ui40937-amber);
  border-color: var(--ui40937-amber);
}

.ui40937-menu-btn svg { width: 20px; height: 20px; }

/* ==========================================================================
   Side drawer menu
   ========================================================================== */

.ui40937-scrim {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: 100vh;
  background: rgba(34, 48, 60, 0.72);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  z-index: 60;
}

.ui40937-scrim.is-open { opacity: 1; visibility: visible; }

.ui40937-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(84vw, 314px);
  background: var(--ui40937-slab);
  border-right: 1px solid var(--ui40937-hairline);
  transform: translateX(-103%);
  transition: transform 0.28s ease;
  z-index: 70;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 14px 14px calc(20px + env(safe-area-inset-bottom));
}

.ui40937-drawer.is-open { transform: translateX(0); }

.ui40937-drawer-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 2px 12px;
  border-bottom: 1px solid var(--ui40937-hairline);
}

.ui40937-drawer-head img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--ui40937-hairline);
}

.ui40937-drawer-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--ui40937-paper);
}

.ui40937-drawer-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--ui40937-slate);
}

.ui40937-drawer-group {
  margin-top: 14px;
}

.ui40937-drawer-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--ui40937-slate);
  padding: 0 2px 6px;
}

.ui40937-drawer-link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: var(--ui40937-tap);
  padding: 10px 10px;
  border-radius: var(--ui40937-radius-sm);
  color: var(--ui40937-paper);
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.ui40937-drawer-link:hover,
.ui40937-drawer-link:focus-visible {
  background: var(--ui40937-amber-soft);
  color: var(--ui40937-amber);
  text-decoration: none;
  border-color: rgba(255, 170, 0, 0.35);
}

.ui40937-drawer-link.is-here {
  color: var(--ui40937-amber);
  border-color: var(--ui40937-amber);
  background: var(--ui40937-amber-soft);
}

.ui40937-drawer-cta {
  margin-top: 18px;
  min-height: var(--ui40937-tap);
  border-radius: var(--ui40937-radius-sm);
  background: var(--ui40937-amber);
  color: var(--ui40937-amber-ink);
  font-weight: 800;
  font-size: 14.5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  transition: filter 0.2s ease;
}

.ui40937-drawer-cta:active { filter: brightness(1.1); }

/* ==========================================================================
   Main canvas rhythm
   ========================================================================== */

.ui40937-main {
  padding: calc(var(--ui40937-top-h) + 12px) 14px
           calc(var(--ui40937-tab-h) + 24px + env(safe-area-inset-bottom));
}

.ui40937-section { margin-top: 26px; }

.ui40937-h2 {
  font-size: 20px;
  line-height: 1.3;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--ui40937-paper);
}

.ui40937-h3 {
  font-size: 15.5px;
  line-height: 1.35;
  font-weight: 700;
  margin: 18px 0 6px;
  color: var(--ui40937-amber);
}

.ui40937-prose { margin: 8px 0 0; }

.ui40937-prose + .ui40937-prose { margin-top: 10px; }

/* Fact strip: summary line before expanded detail */
.ui40937-brief {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-left: 3px solid var(--ui40937-amber);
  border-radius: var(--ui40937-radius-sm);
  padding: 9px 11px;
  font-size: 13.5px;
  color: var(--ui40937-paper-dim);
  margin: 10px 0 4px;
}

.ui40937-brief-tag {
  flex: none;
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--ui40937-amber);
  padding-top: 3px;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.ui40937-hero { margin-top: 2px; }

.ui40937-kicker {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--ui40937-amber);
  border: 1px solid rgba(255, 170, 0, 0.4);
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 10px;
}

.ui40937-h1 {
  font-size: 24px;
  line-height: 1.28;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--ui40937-paper);
}

.ui40937-hero-cta {
  display: flex;
  border: 1px solid var(--ui40937-amber);
  border-radius: var(--ui40937-radius);
  overflow: hidden;
  margin: 14px 0 12px;
  max-width: 340px;
}

.ui40937-hero-cta-btn {
  flex: 1;
  min-height: var(--ui40937-tap);
  font-size: 14px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.ui40937-hero-cta-btn--fill {
  background: var(--ui40937-amber);
  color: var(--ui40937-amber-ink);
}

.ui40937-hero-cta-btn--line {
  color: var(--ui40937-amber);
  border-left: 1px solid var(--ui40937-amber);
}

.ui40937-hero-cta-btn:active { filter: brightness(1.12); }

.ui40937-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  margin: 12px 0 2px;
}

.ui40937-fact {
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  padding: 8px 10px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--ui40937-paper-dim);
}

.ui40937-fact b { color: var(--ui40937-paper); font-weight: 700; }

/* ==========================================================================
   Promo carousel
   ========================================================================== */

.ui40937-stage {
  position: relative;
  margin-top: 18px;
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius);
  overflow: hidden;
  background: var(--ui40937-slab);
}

.ui40937-slides { position: relative; aspect-ratio: 16 / 9; }

.ui40937-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.ui40937-slide.is-on { opacity: 1; visibility: visible; }

.ui40937-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ui40937-slide-note {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: block;
  text-align: left;
  padding: 26px 12px 10px;
  background: linear-gradient(180deg, rgba(34, 48, 60, 0) 0%, rgba(34, 48, 60, 0.88) 78%);
}

.ui40937-slide-note b {
  display: block;
  font-size: 14.5px;
  font-weight: 800;
  color: var(--ui40937-amber);
}

.ui40937-slide-note small {
  display: block;
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--ui40937-paper-dim);
}

.ui40937-stage-ctrl {
  position: absolute;
  bottom: 8px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ui40937-dots { display: flex; gap: 6px; }

.ui40937-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(240, 240, 240, 0.45);
  border: 1px solid rgba(34, 48, 60, 0.5);
  transition: background-color 0.25s ease, transform 0.25s ease;
}

.ui40937-dot.is-on {
  background: var(--ui40937-amber);
  transform: scale(1.25);
}

/* ==========================================================================
   Category rail (horizontal chips)
   ========================================================================== */

.ui40937-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 2px 6px;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.ui40937-rail::-webkit-scrollbar { display: none; }

.ui40937-chip {
  flex: none;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid var(--ui40937-hairline);
  border-radius: 999px;
  background: var(--ui40937-slab);
  color: var(--ui40937-paper);
  font-size: 13px;
  font-weight: 700;
  scroll-snap-align: start;
  transition: color 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.ui40937-chip:hover, .ui40937-chip:focus-visible {
  color: var(--ui40937-amber);
  border-color: var(--ui40937-amber);
  background: var(--ui40937-amber-soft);
  text-decoration: none;
}

/* ==========================================================================
   Game grids - outlined tile cards, 4 cols at 320px, 5 cols near 430px
   ========================================================================== */

.ui40937-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.ui40937-tile {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius);
  padding: 6px 6px 7px;
  min-width: 0;
  text-align: center;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.ui40937-tile:hover, .ui40937-tile:focus-visible {
  border-color: var(--ui40937-amber);
  background: #3a4a56;
}

.ui40937-tile:active { border-color: var(--ui40937-amber); }

.ui40937-tile-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--ui40937-radius-sm);
  border: 1px solid rgba(119, 136, 153, 0.28);
  transition: transform 0.25s ease;
}

.ui40937-tile:hover .ui40937-tile-img,
.ui40937-tile:active .ui40937-tile-img { transform: scale(1.05); }

.ui40937-tile-name {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  overflow: hidden;
  overflow-wrap: anywhere;
  font-size: 10.5px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--ui40937-paper-dim);
  margin-top: 6px;
  min-height: 27px;
}

.ui40937-count {
  font-size: 11.5px;
  color: var(--ui40937-slate);
  font-weight: 600;
  margin-top: 8px;
}

/* ==========================================================================
   Content modules
   ========================================================================== */

/* Tricks: numbered rail rows */
.ui40937-trick {
  display: flex;
  gap: 11px;
  padding: 11px 2px;
  border-bottom: 1px dashed var(--ui40937-hairline);
}

.ui40937-trick:last-child { border-bottom: 0; }

.ui40937-trick-no {
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--ui40937-amber);
  color: var(--ui40937-amber);
  font-size: 13px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ui40937-trick-body { min-width: 0; }

.ui40937-trick-body h3 {
  margin: 1px 0 4px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ui40937-paper);
}

.ui40937-trick-body p { margin: 0; font-size: 13.5px; color: var(--ui40937-paper-dim); }

/* Achievements: milestone ladder */
.ui40937-milestone {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius);
  padding: 10px 11px;
}

.ui40937-milestone + .ui40937-milestone { margin-top: 8px; }

.ui40937-milestone-stamp {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: var(--ui40937-radius-sm);
  background: var(--ui40937-amber-soft);
  border: 1px solid rgba(255, 170, 0, 0.45);
  color: var(--ui40937-amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ui40937-milestone-stamp svg { width: 18px; height: 18px; }

.ui40937-milestone-body { min-width: 0; }

.ui40937-milestone-body h3 {
  margin: 0 0 3px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ui40937-paper);
}

.ui40937-milestone-body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ui40937-paper-dim);
}

/* Steps: ordered walkthrough */
.ui40937-steps {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  counter-reset: ui40937-step;
}

.ui40937-steps li {
  counter-increment: ui40937-step;
  position: relative;
  padding: 0 0 12px 40px;
}

.ui40937-steps li::before {
  content: counter(ui40937-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: var(--ui40937-radius-sm);
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-amber);
  color: var(--ui40937-amber);
  font-size: 13px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ui40937-steps li::after {
  content: "";
  position: absolute;
  left: 13.5px;
  top: 30px;
  bottom: 2px;
  width: 1px;
  background: var(--ui40937-hairline);
}

.ui40937-steps li:last-child::after { display: none; }

.ui40937-steps b {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--ui40937-paper);
}

.ui40937-steps span { font-size: 13.5px; color: var(--ui40937-paper-dim); }

/* Step summary recap */
.ui40937-recap {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.ui40937-recap-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  background: var(--ui40937-slab);
  padding: 9px 11px;
  font-size: 13.5px;
  color: var(--ui40937-paper-dim);
}

.ui40937-recap-row svg {
  flex: none;
  width: 17px;
  height: 17px;
  margin-top: 2px;
  color: var(--ui40937-amber);
}

/* Fact sheet chips */
.ui40937-sheet {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.ui40937-sheet-item {
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  padding: 9px 10px;
}

.ui40937-sheet-item b {
  display: block;
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--ui40937-amber);
  margin-bottom: 3px;
}

.ui40937-sheet-item span { font-size: 12.5px; line-height: 1.45; color: var(--ui40937-paper-dim); }

/* ==========================================================================
   Home extended footer: brand > promotions > directory > disclaimer
   ========================================================================== */

.ui40937-ext {
  margin-top: 30px;
  border-top: 2px solid var(--ui40937-amber);
  padding-top: 16px;
}

.ui40937-ext-title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--ui40937-amber);
  margin: 18px 0 8px;
}

.ui40937-ext-title:first-child { margin-top: 0; }

.ui40937-ext-brand {
  font-size: 13.5px;
  color: var(--ui40937-paper-dim);
  margin: 0;
}

.ui40937-promo-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 8px;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.ui40937-promo-strip::-webkit-scrollbar { display: none; }

.ui40937-promo-chip {
  flex: none;
  scroll-snap-align: start;
  min-height: var(--ui40937-tap);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border-radius: 999px;
  border: 1px solid var(--ui40937-amber);
  color: var(--ui40937-amber);
  font-size: 12.5px;
  font-weight: 700;
  background: var(--ui40937-amber-soft);
  transition: background-color 0.22s ease, color 0.22s ease;
}

.ui40937-promo-chip svg { width: 15px; height: 15px; }

.ui40937-promo-chip:active {
  background: var(--ui40937-amber);
  color: var(--ui40937-amber-ink);
}

.ui40937-directory {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.ui40937-directory a {
  display: block;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  background: var(--ui40937-slab);
  color: var(--ui40937-paper);
  font-size: 13px;
  font-weight: 600;
  transition: border-color 0.22s ease, color 0.22s ease;
}

.ui40937-directory a:hover, .ui40937-directory a:focus-visible {
  border-color: var(--ui40937-amber);
  color: var(--ui40937-amber);
  text-decoration: none;
}

.ui40937-directory small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--ui40937-slate);
  margin-top: 1px;
}

.ui40937-disclaimer {
  font-size: 12px;
  line-height: 1.55;
  color: var(--ui40937-slate);
  background: var(--ui40937-slab);
  border: 1px solid var(--ui40937-hairline);
  border-radius: var(--ui40937-radius-sm);
  padding: 10px 11px;
  margin: 16px 0 0;
}

/* ==========================================================================
   Common footer + fixed tab bar
   ========================================================================== */

.ui40937-footer {
  text-align: center;
  font-size: 12px;
  color: var(--ui40937-slate);
  padding: 16px 0 4px;
  border-top: 1px solid var(--ui40937-hairline);
  margin-top: 22px;
}

.ui40937-tabbar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: calc(var(--ui40937-tab-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  display: flex;
  background: rgba(54, 69, 79, 0.98);
  border-top: 1px solid var(--ui40937-hairline);
  z-index: 55;
}

.ui40937-tab {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--ui40937-slate);
  position: relative;
  padding: 6px 2px;
  transition: color 0.25s ease;
}

.ui40937-tab::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: transparent;
  transition: background-color 0.25s ease;
}

.ui40937-tab-icon {
  display: inline-flex;
  transition: transform 0.25s ease;
}

.ui40937-tab-icon svg { width: 21px; height: 21px; }

.ui40937-tab-text {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.ui40937-tab:hover, .ui40937-tab:focus-visible { color: var(--ui40937-paper); }

.ui40937-tab.is-on {
  color: var(--ui40937-amber);
}

.ui40937-tab.is-on::before { background: var(--ui40937-amber); }

.ui40937-tab.is-on .ui40937-tab-icon { transform: translateY(-1px); }

/* ==========================================================================
   Breakpoints
   ========================================================================== */

@media (min-width: 375px) {
  .ui40937-h1 { font-size: 26px; }
  .ui40937-h2 { font-size: 21px; }
  .ui40937-facts { gap: 8px; }
}

/* Wider phone canvas: game grid steps up to five columns */
@media (min-width: 398px) {
  .ui40937-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 9px; }
  .ui40937-tile-name { font-size: 10.5px; }
}

/* 430px canvas cap: type and rhythm settle */
@media (min-width: 430px) {
  body { box-shadow: 0 0 32px rgba(0, 0, 0, 0.45); }
  .ui40937-drawer { left: calc(50% - 215px); }
  .ui40937-h1 { font-size: 27px; }
  .ui40937-h2 { font-size: 22px; }
  .ui40937-main { padding-left: 18px; padding-right: 18px; }
  .ui40937-prose { font-size: 15px; }
}

/* Desktop framing: keep the phone canvas centered, dim the sides */
@media (min-width: 768px) {
  html { background: #1b2631; }
  body { border-left: 1px solid var(--ui40937-hairline); border-right: 1px solid var(--ui40937-hairline); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .ui40937-slide { transition: none; }
}

/* Help-page controls keep long guidance readable without adding a second layout system. */
.ui40937-section > .ui40937-promo-chip {
  margin-top: 12px;
}

.ui40937-promo-chip {
  cursor: pointer;
}