/* ============================================================
   Hamilton 99 - mobile-first base stylesheet
   Class prefix:  surface18910-
   Canvas:        430px phone frame, centered on wide screens
   Palette:       #0097A7 | #FFA500 | #CCCCCC | #1A1A1A | #00FFFF | #26A69A
   Direction:     high-contrast display font + readable body,
                  small radius / high density, compact square game
                  cards, short partition transitions, pill CTA group.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Phone canvas (the literal 430 mobile width is load-bearing) */
  --surface18910-canvas: 430px;
  --surface18910-canvas-min: 320px;

  /* Brand palette */
  --surface18910-ink: #1A1A1A;
  --surface18910-ink-900: #0d0d0d;
  --surface18910-ink-800: #161616;
  --surface18910-ink-700: #1f1f1f;
  --surface18910-ink-600: #282828;
  --surface18910-ink-500: #333333;
  --surface18910-line: #2c2c2c;
  --surface18910-line-soft: #232323;
  --surface18910-teal: #0097A7;
  --surface18910-teal-dark: #00747f;
  --surface18910-teal-soft: #26A69A;
  --surface18910-amber: #FFA500;
  --surface18910-amber-dark: #d98c00;
  --surface18910-cyan: #00FFFF;
  --surface18910-silver: #CCCCCC;
  --surface18910-silver-dim: #8d8d8d;
  --surface18910-white: #ffffff;
  --surface18910-red: #ff5a5f;

  /* Typography */
  --surface18910-font-display: "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --surface18910-font-body: "Inter", "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;

  /* Radius - small radius, high density */
  --surface18910-radius-xs: 4px;
  --surface18910-radius-sm: 6px;
  --surface18910-radius-md: 10px;
  --surface18910-radius-lg: 14px;
  --surface18910-radius-pill: 999px;

  /* Spacing */
  --surface18910-space-1: 4px;
  --surface18910-space-2: 8px;
  --surface18910-space-3: 12px;
  --surface18910-space-4: 16px;
  --surface18910-space-5: 20px;
  --surface18910-space-6: 24px;
  --surface18910-space-7: 32px;
  --surface18910-space-8: 40px;

  /* Layers */
  --surface18910-z-header: 60;
  --surface18910-z-menu: 70;
  --surface18910-z-overlay: 65;
  --surface18910-z-bottom: 80;
  --surface18910-z-toast: 90;

  /* Motion - short distance partition transitions */
  --surface18910-ease: cubic-bezier(0.22, 0.68, 0.18, 1);
  --surface18910-dur-fast: 140ms;
  --surface18910-dur: 240ms;
  --surface18910-dur-slow: 420ms;

  /* Layout sizes */
  --surface18910-header-h: 58px;
  --surface18910-bottom-h: 66px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--surface18910-font-body);
  background: #000000;
  color: var(--surface18910-white);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--surface18910-cyan); text-decoration: none; }
a:hover { color: var(--surface18910-white); }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; padding: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure { margin: 0; }
input, select, textarea { font-family: inherit; }
:focus-visible {
  outline: 2px solid var(--surface18910-cyan);
  outline-offset: 2px;
  border-radius: var(--surface18910-radius-xs);
}

/* ---------- Phone canvas ---------- */
.surface18910-canvas {
  position: relative;
  width: 100%;
  max-width: 430px;            /* 430 mobile canvas, load-bearing */
  min-width: var(--surface18910-canvas-min);
  margin: 0 auto;
  min-height: 100vh;
  background:
    radial-gradient(120% 60% at 50% -10%, rgba(0,151,167,0.22), transparent 60%),
    linear-gradient(180deg, var(--surface18910-ink-800) 0%, var(--surface18910-ink-900) 100%);
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.7);
  overflow-x: hidden;
}

/* ---------- Skip link ---------- */
.surface18910-skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface18910-amber);
  color: var(--surface18910-ink);
  padding: var(--surface18910-space-2) var(--surface18910-space-4);
  border-radius: var(--surface18910-radius-sm);
  font-weight: 700;
  z-index: var(--surface18910-z-toast);
}
.surface18910-skip:focus { left: var(--surface18910-space-3); top: var(--surface18910-space-3); }

/* ---------- Header (tab-style top bar, fixed) ---------- */
.surface18910-header {
  position: fixed;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: var(--surface18910-header-h);
  background: linear-gradient(180deg, rgba(13,13,13,0.98), rgba(22,22,22,0.96));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--surface18910-line);
  display: flex;
  align-items: center;
  gap: var(--surface18910-space-2);
  padding: 0 var(--surface18910-space-3);
  z-index: var(--surface18910-z-header);
}
.surface18910-brand {
  display: flex;
  align-items: center;
  gap: var(--surface18910-space-2);
  min-width: 0;
  flex: 0 0 auto;
}
.surface18910-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--surface18910-radius-sm);
  object-fit: cover;
  border: 1px solid var(--surface18910-teal);
  box-shadow: 0 0 0 2px rgba(0,151,167,0.18);
  background: var(--surface18910-ink-700);
}
.surface18910-brand-name {
  font-family: var(--surface18910-font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.2px;
  color: var(--surface18910-white);
  white-space: nowrap;
}
.surface18910-brand-name b { color: var(--surface18910-amber); }

.surface18910-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--surface18910-space-2);
}
.surface18910-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 var(--surface18910-space-3);
  border-radius: var(--surface18910-radius-pill);
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  transition: transform var(--surface18910-dur-fast) var(--surface18910-ease),
              background var(--surface18910-dur-fast) var(--surface18910-ease),
              box-shadow var(--surface18910-dur-fast) var(--surface18910-ease);
  white-space: nowrap;
  touch-action: manipulation;
}
.surface18910-btn:active { transform: translateY(1px) scale(0.98); }
.surface18910-btn-register {
  background: linear-gradient(135deg, var(--surface18910-amber) 0%, var(--surface18910-amber-dark) 100%);
  color: var(--surface18910-ink);
  box-shadow: 0 6px 16px rgba(255,165,0,0.28);
}
.surface18910-btn-login {
  background: transparent;
  color: var(--surface18910-white);
  border: 1px solid var(--surface18910-teal);
}
.surface18910-btn-login:hover { background: rgba(0,151,167,0.16); }
.surface18910-btn-block {
  display: flex;
  width: 100%;
  padding: var(--surface18910-space-4);
  font-size: 15px;
}
.surface18910-menu-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--surface18910-radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--surface18910-line);
  color: var(--surface18910-silver);
}
.surface18910-menu-btn:hover { color: var(--surface18910-white); border-color: var(--surface18910-teal); }
.surface18910-menu-btn svg { width: 20px; height: 20px; }

/* ---------- Expandable menu ---------- */
.surface18910-menu {
  position: fixed;
  top: var(--surface18910-header-h);
  left: 50%;
  transform: translate(-50%, -8px);
  width: 100%;
  max-width: 430px;
  background: var(--surface18910-ink-800);
  border-bottom: 1px solid var(--surface18910-line);
  padding: var(--surface18910-space-3);
  z-index: var(--surface18910-z-menu);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--surface18910-dur) var(--surface18910-ease),
              transform var(--surface18910-dur) var(--surface18910-ease),
              visibility var(--surface18910-dur);
  max-height: calc(100vh - var(--surface18910-header-h));
  overflow-y: auto;
}
.surface18910-menu[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.surface18910-menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--surface18910-space-2);
}
.surface18910-menu-link {
  display: flex;
  align-items: center;
  gap: var(--surface18910-space-2);
  padding: var(--surface18910-space-3);
  border-radius: var(--surface18910-radius-sm);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  color: var(--surface18910-silver);
  font-size: 13px;
  font-weight: 600;
  min-height: 44px;
}
.surface18910-menu-link:hover {
  color: var(--surface18910-white);
  border-color: var(--surface18910-teal);
  background: var(--surface18910-ink-600);
}
.surface18910-menu-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--surface18910-teal-soft);
  flex: 0 0 auto;
}
.surface18910-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: var(--surface18910-z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--surface18910-dur) var(--surface18910-ease), visibility var(--surface18910-dur);
}
.surface18910-overlay[data-open="true"] { opacity: 1; visibility: visible; }

/* ---------- Main / sections ---------- */
.surface18910-main {
  padding-top: calc(var(--surface18910-header-h) + var(--surface18910-space-3));
  /* Bottom padding keeps content clear of the fixed bottom nav */
  padding-bottom: calc(var(--surface18910-bottom-h) + var(--surface18910-space-6));
}
.surface18910-section {
  padding: var(--surface18910-space-5) var(--surface18910-space-4);
}
.surface18910-section + .surface18910-section { border-top: 1px solid var(--surface18910-line-soft); }
.surface18910-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--surface18910-cyan);
  margin-bottom: var(--surface18910-space-2);
}
.surface18910-eyebrow::before {
  content: "";
  width: 18px; height: 2px;
  background: linear-gradient(90deg, var(--surface18910-cyan), transparent);
}
.surface18910-h1 {
  font-family: var(--surface18910-font-display);
  font-size: 24px;
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.2px;
  color: var(--surface18910-white);
}
.surface18910-h2 {
  font-family: var(--surface18910-font-display);
  font-size: 19px;
  line-height: 1.28;
  font-weight: 800;
  color: var(--surface18910-white);
  margin-bottom: var(--surface18910-space-2);
}
.surface18910-h3 {
  font-family: var(--surface18910-font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--surface18910-amber);
  margin-bottom: var(--surface18910-space-2);
}
.surface18910-lead {
  color: var(--surface18910-silver);
  font-size: 14px;
}
.surface18910-lead a { color: var(--surface18910-cyan); font-weight: 600; }
.surface18910-lead a:hover { color: var(--surface18910-white); text-decoration: underline; }
.surface18910-prose { color: var(--surface18910-silver); font-size: 14px; }
.surface18910-prose p + p { margin-top: var(--surface18910-space-3); }
.surface18910-prose a { color: var(--surface18910-cyan); font-weight: 600; }
.surface18910-prose strong { color: var(--surface18910-white); }

/* ---------- Hero carousel ---------- */
.surface18910-hero {
  position: relative;
  padding: var(--surface18910-space-3) var(--surface18910-space-4) 0;
}
.surface18910-carousel {
  position: relative;
  border-radius: var(--surface18910-radius-lg);
  overflow: hidden;
  border: 1px solid var(--surface18910-line);
  background: var(--surface18910-ink-700);
}
.surface18910-track {
  display: flex;
  transition: transform var(--surface18910-dur-slow) var(--surface18910-ease);
  will-change: transform;
}
.surface18910-slide {
  position: relative;
  min-width: 100%;
  height: 190px;
}
.surface18910-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.surface18910-slide-caption {
  position: absolute;
  left: var(--surface18910-space-4);
  bottom: var(--surface18910-space-4);
  right: var(--surface18910-space-4);
  display: flex;
  flex-direction: column;
  gap: var(--surface18910-space-2);
  align-items: flex-start;
}
.surface18910-slide-tag {
  background: rgba(0,0,0,0.55);
  border: 1px solid rgba(0,255,255,0.4);
  color: var(--surface18910-cyan);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--surface18910-radius-pill);
  letter-spacing: 0.04em;
}
.surface18910-slide-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--surface18910-amber), var(--surface18910-amber-dark));
  color: var(--surface18910-ink);
  font-weight: 800;
  font-size: 13px;
  padding: 8px 16px;
  border-radius: var(--surface18910-radius-pill);
  box-shadow: 0 8px 22px rgba(255,165,0,0.35);
}
.surface18910-dots {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}
.surface18910-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transition: background var(--surface18910-dur-fast), width var(--surface18910-dur-fast);
  border: 0;
  padding: 0;
}
.surface18910-dot[aria-current="true"] {
  background: var(--surface18910-amber);
  width: 18px;
  border-radius: var(--surface18910-radius-pill);
}
.surface18910-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 34px; height: 34px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.18);
  color: var(--surface18910-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}
.surface18910-arrow:hover { background: rgba(0,151,167,0.6); }
.surface18910-arrow[data-dir="prev"] { left: 8px; }
.surface18910-arrow[data-dir="next"] { right: 8px; }
.surface18910-arrow svg { width: 16px; height: 16px; }

/* ---------- Quick promo strip ---------- */
.surface18910-quick {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--surface18910-space-2);
  padding: var(--surface18910-space-4);
}
.surface18910-quick-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
  padding: var(--surface18910-space-3) var(--surface18910-space-2);
  background: linear-gradient(180deg, var(--surface18910-ink-700), var(--surface18910-ink-600));
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
  min-height: 64px;
}
.surface18910-quick-card .surface18910-quick-num {
  font-family: var(--surface18910-font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--surface18910-amber);
  line-height: 1;
}
.surface18910-quick-card .surface18910-quick-label {
  font-size: 11px;
  color: var(--surface18910-silver);
  letter-spacing: 0.02em;
}

/* ---------- Category block + game grid ---------- */
.surface18910-cat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--surface18910-space-3);
  margin-bottom: var(--surface18910-space-3);
}
.surface18910-cat-title {
  display: inline-flex;
  align-items: center;
  gap: var(--surface18910-space-2);
  font-family: var(--surface18910-font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--surface18910-white);
  letter-spacing: 0.02em;
}
.surface18910-cat-pip {
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--surface18910-teal);
  box-shadow: 0 0 10px rgba(0,151,167,0.7);
}
.surface18910-cat-pip.amber { background: var(--surface18910-amber); box-shadow: 0 0 10px rgba(255,165,0,0.7); }
.surface18910-cat-pip.cyan { background: var(--surface18910-cyan); box-shadow: 0 0 10px rgba(0,255,255,0.7); }
.surface18910-cat-pip.soft { background: var(--surface18910-teal-soft); box-shadow: 0 0 10px rgba(38,166,154,0.7); }
.surface18910-cat-pip.silver { background: var(--surface18910-silver); box-shadow: 0 0 10px rgba(204,204,204,0.6); }
.surface18910-cat-note {
  font-size: 11px;
  color: var(--surface18910-silver-dim);
  letter-spacing: 0.04em;
}
.surface18910-game-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--surface18910-space-2);
}
@media (min-width: 360px) {
  .surface18910-game-grid { gap: var(--surface18910-space-3); }
}
@media (min-width: 395px) {
  .surface18910-game-grid { grid-template-columns: repeat(5, 1fr); }
}
.surface18910-game-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 4px;
  padding: 0;
  background: transparent;
  border-radius: var(--surface18910-radius-md);
  transition: transform var(--surface18910-dur-fast) var(--surface18910-ease);
}
.surface18910-game-card:hover { transform: translateY(-2px); }
.surface18910-game-card:active { transform: translateY(0) scale(0.97); }
.surface18910-game-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--surface18910-radius-sm);
  overflow: hidden;
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
}
.surface18910-game-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--surface18910-dur) var(--surface18910-ease);
}
.surface18910-game-card:hover .surface18910-game-thumb img { transform: scale(1.06); }
.surface18910-game-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.45) 100%);
  pointer-events: none;
}
.surface18910-game-name {
  font-size: 11px;
  line-height: 1.25;
  color: var(--surface18910-silver);
  font-weight: 600;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 28px;
}
.surface18910-game-card:hover .surface18910-game-name { color: var(--surface18910-white); }
.surface18910-game-badges {
  position: absolute;
  top: 4px; left: 4px;
  display: flex;
  gap: 3px;
  z-index: 1;
}
.surface18910-game-badges span {
  font-size: 9px;
  font-weight: 800;
  padding: 2px 5px;
  border-radius: var(--surface18910-radius-xs);
  letter-spacing: 0.02em;
}
.surface18910-badge-hot { background: var(--surface18910-red); color: #fff; }
.surface18910-badge-new { background: var(--surface18910-cyan); color: var(--surface18910-ink); }
.surface18910-badge-rtp { background: var(--surface18910-amber); color: var(--surface18910-ink); }

/* ---------- Winners strip ---------- */
.surface18910-winners {
  background: linear-gradient(180deg, rgba(0,151,167,0.10), rgba(0,0,0,0));
  border-top: 1px solid var(--surface18910-line-soft);
  border-bottom: 1px solid var(--surface18910-line-soft);
}
.surface18910-winner-list {
  display: grid;
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-3);
}
.surface18910-winner {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: var(--surface18910-space-3);
  padding: var(--surface18910-space-3);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-winner-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--surface18910-teal), var(--surface18910-teal-soft));
  display: flex; align-items: center; justify-content: center;
  color: var(--surface18910-ink);
  font-weight: 800;
  font-size: 13px;
}
.surface18910-winner-meta { min-width: 0; }
.surface18910-winner-name {
  font-size: 13px; font-weight: 700; color: var(--surface18910-white);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.surface18910-winner-game { font-size: 11px; color: var(--surface18910-silver-dim); }
.surface18910-winner-prize {
  font-family: var(--surface18910-font-display);
  font-weight: 800;
  font-size: 14px;
  color: var(--surface18910-amber);
  white-space: nowrap;
}

/* ---------- Highlights (compact metric-explanation) ---------- */
.surface18910-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-3);
}
.surface18910-metric {
  padding: var(--surface18910-space-3);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-metric-k {
  font-family: var(--surface18910-font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--surface18910-cyan);
}
.surface18910-metric-v { font-size: 12px; color: var(--surface18910-silver); margin-top: 2px; }
.surface18910-highlight-list {
  display: grid;
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-3);
}
.surface18910-highlight {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--surface18910-space-3);
  padding: var(--surface18910-space-3);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-highlight-ico {
  width: 28px; height: 28px;
  border-radius: var(--surface18910-radius-sm);
  background: rgba(0,151,167,0.18);
  color: var(--surface18910-cyan);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 13px;
  border: 1px solid rgba(0,151,167,0.4);
}
.surface18910-highlight-t { font-size: 13px; font-weight: 700; color: var(--surface18910-white); }
.surface18910-highlight-d { font-size: 12px; color: var(--surface18910-silver); margin-top: 2px; }

/* ---------- Use case guidance ---------- */
.surface18910-usecases {
  display: grid;
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-3);
}
.surface18910-usecase {
  padding: var(--surface18910-space-3) var(--surface18910-space-4);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-left: 3px solid var(--surface18910-amber);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-usecase-t { font-size: 13px; font-weight: 700; color: var(--surface18910-white); }
.surface18910-usecase-d { font-size: 12px; color: var(--surface18910-silver); margin-top: 3px; }
.surface18910-usecase-d a { color: var(--surface18910-cyan); font-weight: 600; }

/* ---------- Scenario / FAQ ---------- */
.surface18910-scenario {
  background: var(--surface18910-ink-800);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
  padding: var(--surface18910-space-4);
  margin-top: var(--surface18910-space-3);
}
.surface18910-q {
  font-size: 13px;
  font-weight: 700;
  color: var(--surface18910-amber);
  display: flex;
  gap: var(--surface18910-space-2);
}
.surface18910-q::before {
  content: "Q";
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px;
  background: var(--surface18910-amber);
  color: var(--surface18910-ink);
  border-radius: var(--surface18910-radius-xs);
  font-size: 11px;
  flex: 0 0 auto;
}
.surface18910-a {
  font-size: 13px;
  color: var(--surface18910-silver);
  margin-top: var(--surface18910-space-2);
  padding-left: 26px;
}
.surface18910-a + .surface18910-q { margin-top: var(--surface18910-space-4); }

/* ---------- Steps ---------- */
.surface18910-steps { counter-reset: step; margin-top: var(--surface18910-space-3); display: grid; gap: var(--surface18910-space-2); }
.surface18910-step {
  position: relative;
  padding: var(--surface18910-space-3) var(--surface18910-space-3) var(--surface18910-space-3) 44px;
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 10px; top: 50%; transform: translateY(-50%);
  width: 24px; height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--surface18910-teal), var(--surface18910-teal-soft));
  color: var(--surface18910-ink);
  font-weight: 800;
  font-size: 12px;
  display: flex; align-items: center; justify-content: center;
}
.surface18910-step-t { font-size: 13px; font-weight: 700; color: var(--surface18910-white); }
.surface18910-step-d { font-size: 12px; color: var(--surface18910-silver); margin-top: 2px; }

/* ---------- Extended footer (homepage only) ---------- */
.surface18910-ext {
  background: linear-gradient(180deg, rgba(0,151,167,0.08), var(--surface18910-ink-900));
  border-top: 1px solid var(--surface18910-line);
  padding: var(--surface18910-space-6) var(--surface18910-space-4);
}
.surface18910-ext-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--surface18910-space-3);
  margin-top: var(--surface18910-space-4);
}
.surface18910-ext-promo {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--surface18910-space-3);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-md);
  min-height: 44px;
}
.surface18910-ext-promo-t { font-size: 13px; font-weight: 700; color: var(--surface18910-amber); }
.surface18910-ext-promo-d { font-size: 11px; color: var(--surface18910-silver); }
.surface18910-ext-promo:hover { border-color: var(--surface18910-teal); }
.surface18910-directory {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-3);
}
.surface18910-directory a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px var(--surface18910-space-3);
  background: var(--surface18910-ink-700);
  border: 1px solid var(--surface18910-line);
  border-radius: var(--surface18910-radius-sm);
  font-size: 12px;
  color: var(--surface18910-silver);
  font-weight: 600;
  min-height: 40px;
}
.surface18910-directory a:hover { color: var(--surface18910-white); border-color: var(--surface18910-teal); }
.surface18910-directory a::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--surface18910-teal-soft);
  flex: 0 0 auto;
}
.surface18910-disclaimer {
  margin-top: var(--surface18910-space-5);
  padding: var(--surface18910-space-3);
  border-left: 3px solid var(--surface18910-amber);
  background: rgba(255,165,0,0.06);
  border-radius: var(--surface18910-radius-sm);
  font-size: 11px;
  color: var(--surface18910-silver-dim);
  line-height: 1.55;
}

/* ---------- Common footer ---------- */
.surface18910-footer {
  padding: var(--surface18910-space-5) var(--surface18910-space-4);
  text-align: center;
  border-top: 1px solid var(--surface18910-line);
  background: var(--surface18910-ink-900);
}
.surface18910-footer-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--surface18910-space-2);
  color: var(--surface18910-silver-dim);
  font-size: 12px;
}
.surface18910-footer-mark img { width: 22px; height: 22px; border-radius: var(--surface18910-radius-xs); }
.surface18910-copy { font-size: 11px; color: var(--surface18910-silver-dim); margin-top: var(--surface18910-space-2); }

/* ---------- Mobile bottom nav (5 roles, layered) ---------- */
.surface18910-bottom {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: var(--surface18910-bottom-h);
  background: linear-gradient(180deg, rgba(22,22,22,0.96), rgba(13,13,13,0.99));
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--surface18910-line);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: stretch;
  z-index: var(--surface18910-z-bottom);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.surface18910-bottom-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--surface18910-silver-dim);
  font-size: 10px;
  font-weight: 600;
  padding: 6px 2px 4px;
  transition: color var(--surface18910-dur-fast) var(--surface18910-ease);
}
.surface18910-bottom-item .surface18910-bottom-ico {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  color: inherit;
}
.surface18910-bottom-item .surface18910-bottom-ico svg { width: 22px; height: 22px; }
.surface18910-bottom-item:hover { color: var(--surface18910-white); }
.surface18910-bottom-item[aria-current="page"] {
  color: var(--surface18910-amber);
}
.surface18910-bottom-item[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 30px; height: 3px;
  border-radius: 0 0 var(--surface18910-radius-pill) var(--surface18910-radius-pill);
  background: var(--surface18910-amber);
}
.surface18910-bottom-item.is-promo {
  color: var(--surface18910-cyan);
}
.surface18910-bottom-item.is-promo .surface18910-bottom-ico {
  background: linear-gradient(135deg, var(--surface18910-amber), var(--surface18910-amber-dark));
  color: var(--surface18910-ink);
  border-radius: 50%;
  width: 30px; height: 30px;
  box-shadow: 0 4px 12px rgba(255,165,0,0.35);
  margin-top: -4px;
}

/* ---------- CTA cluster ---------- */
.surface18910-cta-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--surface18910-space-2);
  margin-top: var(--surface18910-space-4);
}

/* ---------- Utility ---------- */
.surface18910-container { width: 100%; }
.surface18910-hide { display: none !important; }
.surface18910-mt-3 { margin-top: var(--surface18910-space-3); }
.surface18910-mt-4 { margin-top: var(--surface18910-space-4); }
.surface18910-muted { color: var(--surface18910-silver-dim); }
.surface18910-pill {
  display: inline-flex; align-items: center;
  padding: 3px 9px;
  border-radius: var(--surface18910-radius-pill);
  font-size: 11px;
  font-weight: 700;
  background: rgba(0,151,167,0.18);
  color: var(--surface18910-cyan);
  border: 1px solid rgba(0,151,167,0.4);
}
.surface18910-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--surface18910-line), transparent);
  margin: var(--surface18910-space-2) 0;
}

/* ---------- Inner-page editorial patterns ---------- */
.surface18910-article-hero {
  margin: var(--surface18910-space-3) var(--surface18910-space-4) 0;
  padding: var(--surface18910-space-5) var(--surface18910-space-4);
  background: linear-gradient(145deg, rgba(0,151,167,.2), rgba(13,13,13,.98) 68%);
  border: 1px solid var(--surface18910-line);
  border-top: 3px solid var(--surface18910-teal);
  border-radius: var(--surface18910-radius-md);
}
.surface18910-signal {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: var(--surface18910-space-3);
  align-items: stretch;
  margin-top: var(--surface18910-space-4);
}
.surface18910-signal-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  border: 1px solid var(--surface18910-teal);
  background: rgba(0,151,167,.14);
  color: var(--surface18910-cyan);
  font: 800 24px/1 var(--surface18910-font-display);
  border-radius: var(--surface18910-radius-sm);
}
.surface18910-signal-score small { margin-top: 6px; color: var(--surface18910-silver); font: 600 10px/1.2 var(--surface18910-font-body); }
.surface18910-signal-copy { padding: var(--surface18910-space-3); background: var(--surface18910-ink-700); border: 1px solid var(--surface18910-line); border-radius: var(--surface18910-radius-sm); }
.surface18910-signal-copy strong { display: block; color: var(--surface18910-white); font-size: 13px; }
.surface18910-signal-copy span { display: block; margin-top: 4px; color: var(--surface18910-silver); font-size: 12px; }
.surface18910-diagnostic { display: grid; gap: var(--surface18910-space-3); margin-top: var(--surface18910-space-3); }
.surface18910-diagnostic-row { border-left: 3px solid var(--surface18910-teal-soft); padding: var(--surface18910-space-3); background: var(--surface18910-ink-700); }
.surface18910-diagnostic-row b { display: block; color: var(--surface18910-white); font-size: 13px; }
.surface18910-diagnostic-row p { margin-top: 4px; color: var(--surface18910-silver); font-size: 12px; }
.surface18910-path { position: relative; margin-top: var(--surface18910-space-4); padding-left: 24px; }
.surface18910-path::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--surface18910-teal-dark); }
.surface18910-path-item { position: relative; padding: 0 0 var(--surface18910-space-4) var(--surface18910-space-3); color: var(--surface18910-silver); font-size: 13px; }
.surface18910-path-item::before { content: ""; position: absolute; left: -22px; top: 5px; width: 10px; height: 10px; border-radius: 50%; background: var(--surface18910-amber); border: 2px solid var(--surface18910-ink-900); }
.surface18910-path-item b { display: block; color: var(--surface18910-white); }
.surface18910-checkboard { display: grid; grid-template-columns: 1fr 1fr; gap: var(--surface18910-space-2); margin-top: var(--surface18910-space-3); }
.surface18910-check { min-height: 72px; padding: var(--surface18910-space-3); border: 1px solid var(--surface18910-line); background: var(--surface18910-ink-700); border-radius: var(--surface18910-radius-sm); color: var(--surface18910-silver); font-size: 12px; }
.surface18910-check b { display: block; color: var(--surface18910-amber); font-size: 13px; margin-bottom: 3px; }
.surface18910-compare { width: 100%; margin-top: var(--surface18910-space-3); border-collapse: collapse; font-size: 12px; }
.surface18910-compare th, .surface18910-compare td { padding: 10px 8px; text-align: left; border: 1px solid var(--surface18910-line); vertical-align: top; }
.surface18910-compare th { background: rgba(0,151,167,.15); color: var(--surface18910-cyan); }
.surface18910-compare td { color: var(--surface18910-silver); background: var(--surface18910-ink-700); }
.surface18910-callout { margin-top: var(--surface18910-space-4); padding: var(--surface18910-space-4); border: 1px solid var(--surface18910-amber-dark); background: rgba(255,165,0,.07); border-radius: var(--surface18910-radius-sm); color: var(--surface18910-silver); font-size: 13px; }
.surface18910-promo-line { display: flex; width: 100%; min-height: 44px; align-items: center; justify-content: space-between; gap: 8px; margin-top: var(--surface18910-space-3); padding: 10px 12px; background: var(--surface18910-ink-700); border: 1px solid var(--surface18910-teal); border-radius: var(--surface18910-radius-sm); color: var(--surface18910-white); font-weight: 700; font-size: 13px; text-align: left; }
.surface18910-promo-line span { color: var(--surface18910-cyan); }
.surface18910-answer-band { margin-top: var(--surface18910-space-3); padding: var(--surface18910-space-4); border-top: 1px solid var(--surface18910-teal); border-bottom: 1px solid var(--surface18910-teal); background: rgba(0,151,167,.08); color: var(--surface18910-silver); font-size: 13px; }
.surface18910-answer-band b { color: var(--surface18910-white); }
.surface18910-token-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: var(--surface18910-space-3); }
.surface18910-token { padding: 5px 9px; border: 1px solid var(--surface18910-line); border-radius: var(--surface18910-radius-xs); color: var(--surface18910-silver); background: var(--surface18910-ink-700); font-size: 11px; }
@media (max-width: 339px) {
  .surface18910-actions .surface18910-btn-login { display: none; }
  .surface18910-brand-name { font-size: 15px; }
  .surface18910-checkboard { grid-template-columns: 1fr; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .surface18910-track { transition: none !important; }
}

/* ---------- Wide screen frame ---------- */
@media (min-width: 460px) {
  body { background: #050505; }
  .surface18910-canvas { border-left: 1px solid var(--surface18910-line); border-right: 1px solid var(--surface18910-line); }
}

/* ---------- Very small screens ---------- */
@media (max-width: 359px) {
  .surface18910-h1 { font-size: 21px; }
  .surface18910-ext-grid { grid-template-columns: 1fr; }
  .surface18910-quick { grid-template-columns: repeat(3, 1fr); }
}