:root {
  color-scheme: dark;
  --ink: #f8fbff;
  --muted: #a9b7bf;
  --panel: rgba(9, 16, 20, 0.78);
  --panel-strong: #0f1a20;
  --line: rgba(218, 238, 245, 0.18);
  --line-hot: rgba(255, 255, 255, 0.3);
  --mint: #6de1a6;
  --cyan: #46d6ca;
  --blue: #68b7ff;
  --gold: #f5c45b;
  --pink: #ff7ac3;
  --danger: #ff6f61;
  --cell-dark: #101b20;
  --cell-hidden: #17262d;
  --shadow: 0 24px 88px rgba(0, 0, 0, 0.46);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  overflow-x: hidden;
  overflow-y: auto;
  background:
    radial-gradient(circle at 10% 12%, rgba(70, 214, 202, 0.24), transparent 25rem),
    radial-gradient(circle at 92% 6%, rgba(245, 196, 91, 0.2), transparent 24rem),
    radial-gradient(circle at 52% 108%, rgba(104, 183, 255, 0.13), transparent 26rem),
    linear-gradient(145deg, #070e12 0%, #111a23 52%, #08100f 100%);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
a {
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 1;
}

.sr-only {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  margin: -1px;
  border: 0;
  padding: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.sweep-app {
  position: relative;
  isolation: isolate;
  display: grid;
  align-content: start;
  grid-template-rows: auto;
  gap: 12px;
  width: 100%;
  min-height: 100svh;
  padding: 16px;
  overflow: visible;
}

.sweep-app::before,
.sweep-app::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.sweep-app::before {
  inset: -18% -10%;
  z-index: -3;
  background:
    linear-gradient(112deg, transparent 0 18%, rgba(70, 214, 202, 0.1) 18% 20%, transparent 20% 47%, rgba(245, 196, 91, 0.09) 47% 49%, transparent 49% 100%),
    linear-gradient(68deg, transparent 0 33%, rgba(104, 183, 255, 0.09) 33% 35%, transparent 35% 100%),
    linear-gradient(158deg, transparent 0 61%, rgba(255, 122, 195, 0.05) 61% 62%, transparent 62% 100%);
  opacity: 0.95;
  transform: rotate(-3deg);
}

.sweep-app::after {
  inset: auto 8% -20px;
  z-index: -2;
  height: 190px;
  background: linear-gradient(90deg, transparent, rgba(70, 214, 202, 0.18), rgba(245, 196, 91, 0.14), transparent);
  filter: blur(34px);
  opacity: 0.76;
}

.ambient-grid {
  position: absolute;
  inset: 0;
  z-index: -4;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 34%, rgba(0, 0, 0, 0.95), transparent 76%);
}

.titlebar,
.game-hud,
.difficulty-bar,
.board-shell {
  position: relative;
  z-index: 2;
  width: min(1120px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.025)),
    var(--panel);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.08), inset 0 -18px 50px rgba(0, 0, 0, 0.14);
  backdrop-filter: blur(18px);
}

.titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 68px;
  padding: 10px 12px;
}

.brand-link {
  min-width: 0;
  text-decoration: none;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(70, 214, 202, 0.96), rgba(109, 225, 166, 0.9) 48%, rgba(245, 196, 91, 0.92)),
    #46d6ca;
  color: #061013;
  font-size: 0.84rem;
  font-weight: 950;
  box-shadow: 0 12px 28px rgba(70, 214, 202, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.52);
}

.brand-title {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-title strong {
  font-size: 1.24rem;
  line-height: 1;
}

.document-name {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.78rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.game-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.game-nav a,
.game-nav button,
.difficulty-bar button {
  min-height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.035)),
    rgba(255, 255, 255, 0.045);
  padding: 0 12px;
  text-decoration: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  font-weight: 750;
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.game-nav a {
  display: inline-grid;
  place-items: center;
}

.game-nav a:hover,
.game-nav button:hover:not(:disabled),
.difficulty-bar button:hover,
.game-nav a:focus-visible,
.game-nav button:focus-visible,
.difficulty-bar button:focus-visible {
  border-color: rgba(70, 214, 202, 0.84);
  background: rgba(70, 214, 202, 0.12);
  box-shadow: 0 0 0 3px rgba(70, 214, 202, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  outline: 3px solid #f5c45b;
  outline-offset: 4px;
}

.game-nav button:active:not(:disabled),
.difficulty-bar button:active {
  transform: translateY(1px);
}

.game-nav button[aria-pressed="true"],
.difficulty-bar button.active,
.difficulty-bar button[aria-checked="true"] {
  border-color: rgba(245, 196, 91, 0.58);
  background:
    linear-gradient(135deg, rgba(245, 196, 91, 0.98), rgba(70, 214, 202, 0.82));
  color: #061013;
  font-weight: 900;
}

.game-nav .nav-cta {
  border-color: rgba(245, 196, 91, 0.52);
  background:
    linear-gradient(135deg, rgba(245, 196, 91, 0.98), rgba(109, 225, 166, 0.9) 58%, rgba(104, 183, 255, 0.86));
  color: #071013;
  font-weight: 850;
  box-shadow: 0 12px 32px rgba(104, 183, 255, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.game-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px;
}

.hud-cluster {
  display: grid;
  flex: 1 1 auto;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.stat-chip {
  position: relative;
  overflow: hidden;
  display: grid;
  min-height: 58px;
  align-content: center;
  gap: 3px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 8px;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.025)),
    rgba(255, 255, 255, 0.052);
  padding: 8px 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.055);
}

.stat-chip::before {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.12), transparent 45%);
  opacity: 0.34;
  pointer-events: none;
}

.stat-chip.current {
  border-color: rgba(70, 214, 202, 0.36);
  background:
    linear-gradient(145deg, rgba(70, 214, 202, 0.18), rgba(245, 196, 91, 0.06)),
    rgba(70, 214, 202, 0.08);
  box-shadow: 0 0 34px rgba(70, 214, 202, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.stat-chip span {
  position: relative;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.stat-chip strong {
  position: relative;
  overflow: hidden;
  color: #ffffff;
  font-size: 1.24rem;
  font-weight: 950;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hud-status {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 180px;
  gap: 9px;
  padding: 8px 10px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(70, 214, 202, 0.12);
}

.round-status {
  margin: 0;
  color: #e2eef0;
  font-size: 0.92rem;
  font-weight: 850;
}

.game-stage-wrap {
  display: grid;
  align-content: start;
  min-height: 0;
  gap: 10px;
}

.difficulty-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 8px;
}

.difficulty-bar::before {
  position: absolute;
  inset: 8px auto 8px 12px;
  width: 60px;
  border-radius: 8px;
  background:
    radial-gradient(circle at 18px 50%, rgba(70, 214, 202, 0.55) 0 4px, transparent 5px),
    radial-gradient(circle at 36px 50%, rgba(245, 196, 91, 0.55) 0 4px, transparent 5px),
    radial-gradient(circle at 54px 50%, rgba(104, 183, 255, 0.48) 0 4px, transparent 5px);
  content: "";
  opacity: 0.76;
  pointer-events: none;
}

.difficulty-bar button {
  min-width: 108px;
  font-weight: 850;
}

.board-shell {
  --cols: 9;
  --rows: 9;
  --cell: clamp(24px, min(calc((100vw - 60px) / var(--cols)), calc((100svh - 260px) / var(--rows))), 42px);
  display: grid;
  min-height: 0;
  height: min(620px, calc(100svh - 230px));
  padding: 12px;
  overflow: hidden;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.02)),
    radial-gradient(circle at 24% 18%, rgba(70, 214, 202, 0.13), transparent 34%),
    radial-gradient(circle at 82% 84%, rgba(245, 196, 91, 0.12), transparent 34%),
    rgba(8, 15, 18, 0.82);
}

.board-shell::before,
.board-shell::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.board-shell::before {
  inset: 10px;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}

.board-shell::after {
  inset: auto 16px 12px;
  z-index: 1;
  height: 44px;
  background: linear-gradient(90deg, transparent, rgba(70, 214, 202, 0.14), rgba(245, 196, 91, 0.11), transparent);
  filter: blur(18px);
}

.board-scroll {
  display: grid;
  overflow: auto;
  place-items: center;
  position: relative;
  z-index: 2;
  min-width: 0;
  min-height: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.04), transparent 28%),
    radial-gradient(circle at 20% 20%, rgba(70, 214, 202, 0.14), transparent 30%),
    radial-gradient(circle at 78% 78%, rgba(245, 196, 91, 0.13), transparent 30%),
    rgba(4, 9, 12, 0.64);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), inset 0 -24px 70px rgba(0, 0, 0, 0.34), 0 18px 50px rgba(0, 0, 0, 0.22);
  scrollbar-color: rgba(70, 214, 202, 0.5) rgba(255, 255, 255, 0.06);
  scrollbar-width: thin;
}

.mine-board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell));
  grid-template-rows: repeat(var(--rows), var(--cell));
  gap: 4px;
  width: max-content;
  padding: 10px;
  touch-action: manipulation;
  border-radius: 10px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012)),
    rgba(1, 5, 7, 0.22);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.cell {
  position: relative;
  display: grid;
  width: var(--cell);
  height: var(--cell);
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 7px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.17), rgba(255, 255, 255, 0.025) 55%, rgba(0, 0, 0, 0.12)),
    radial-gradient(circle at 28% 22%, rgba(70, 214, 202, 0.13), transparent 40%),
    var(--cell-hidden);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24), inset 0 1px 0 rgba(255, 255, 255, 0.16), inset 0 -8px 18px rgba(0, 0, 0, 0.18);
  color: #f9fcff;
  font-size: clamp(0.72rem, calc(var(--cell) * 0.42), 1.05rem);
  font-weight: 950;
  line-height: 1;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  transition: border-color 130ms ease, background 130ms ease, box-shadow 130ms ease, transform 130ms ease, filter 130ms ease;
}

.cell::before,
.cell::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.cell::before {
  inset: 3px;
  border-radius: 5px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent 44%);
  opacity: 0.58;
}

.cell:hover:not(:disabled),
.cell:focus-visible {
  border-color: rgba(70, 214, 202, 0.72);
  background:
    linear-gradient(145deg, rgba(70, 214, 202, 0.18), rgba(255, 255, 255, 0.03)),
    #17262d;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.28), 0 0 0 3px rgba(70, 214, 202, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  outline: 3px solid #f5c45b;
  outline-offset: 3px;
  transform: translateY(-1px);
}

.cell:disabled {
  cursor: default;
}

.cell.revealed {
  border-color: rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.018)),
    rgba(12, 22, 27, 0.95);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), inset 0 8px 20px rgba(0, 0, 0, 0.16);
  animation: reveal-pop 150ms ease-out;
  transform: none;
}

.cell.revealed::before {
  opacity: 0.18;
}

.cell.empty {
  color: transparent;
}

.cell.flagged {
  border-color: rgba(245, 196, 91, 0.62);
  background:
    linear-gradient(145deg, rgba(245, 196, 91, 0.32), rgba(70, 214, 202, 0.08)),
    #1d2625;
  color: var(--gold);
  box-shadow: 0 12px 28px rgba(245, 196, 91, 0.11), inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.cell.flagged::before {
  inset: auto;
  left: 30%;
  top: 24%;
  width: 4px;
  height: 52%;
  border-radius: 999px;
  background: #fff8d6;
  opacity: 1;
}

.cell.flagged::after {
  inset: auto;
  left: calc(30% + 4px);
  top: 21%;
  width: 43%;
  height: 34%;
  border-radius: 3px 7px 7px 3px;
  background: linear-gradient(135deg, #fff090, #f5c45b 50%, #ff8fbf);
  box-shadow: 0 7px 14px rgba(0, 0, 0, 0.22);
}

.cell.mine-hit {
  border-color: rgba(255, 111, 97, 0.72);
  background:
    linear-gradient(145deg, rgba(255, 111, 97, 0.36), rgba(255, 255, 255, 0.035)),
    #2a1517;
  color: #ffffff;
  animation: danger-pop 200ms ease-out;
}

.cell.mine-revealed {
  color: #ffb4ad;
}

.cell.mine-hit::before,
.cell.mine-revealed::before {
  inset: 25%;
  border-radius: 999px;
  background:
    radial-gradient(circle at 35% 32%, rgba(255, 255, 255, 0.42) 0 12%, transparent 13%),
    linear-gradient(145deg, #ff8b7f, #ff4e45 58%, #771b20);
  box-shadow: 0 0 0 4px rgba(255, 111, 97, 0.14), 0 8px 18px rgba(0, 0, 0, 0.26);
  opacity: 1;
}

.cell.mine-hit::after,
.cell.mine-revealed::after {
  inset: 18%;
  border-radius: 999px;
  background:
    linear-gradient(90deg, transparent 0 44%, rgba(255, 180, 173, 0.86) 44% 56%, transparent 56%),
    linear-gradient(0deg, transparent 0 44%, rgba(255, 180, 173, 0.86) 44% 56%, transparent 56%);
  opacity: 0.92;
}

.cell.wrong-flag {
  color: #ffffff;
  background:
    linear-gradient(145deg, rgba(255, 122, 195, 0.32), rgba(255, 255, 255, 0.035)),
    #2a1822;
}

.cell.n1 {
  color: #68b7ff;
}

.cell.n2 {
  color: #6de1a6;
}

.cell.n3 {
  color: #f5c45b;
}

.cell.n4 {
  color: #ff9acb;
}

.cell.n5,
.cell.n6,
.cell.n7,
.cell.n8 {
  color: #ff806f;
}

.game-menu {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 18px;
  background:
    radial-gradient(circle at 50% 50%, rgba(70, 214, 202, 0.08), transparent 34%),
    linear-gradient(135deg, rgba(5, 10, 13, 0.82), rgba(5, 10, 13, 0.48)),
    rgba(5, 10, 13, 0.54);
  opacity: 1;
  pointer-events: auto;
  transition: opacity 160ms ease, visibility 160ms ease;
  visibility: visible;
}

.game-menu.is-hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.menu-card {
  position: relative;
  overflow: hidden;
  display: grid;
  justify-items: center;
  width: min(344px, 100%);
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.035)),
    radial-gradient(circle at 22% 18%, rgba(70, 214, 202, 0.14), transparent 36%),
    rgba(10, 18, 21, 0.94);
  box-shadow: 0 26px 86px rgba(0, 0, 0, 0.56), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  padding: 20px;
  text-align: center;
}

.menu-card::before {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgba(70, 214, 202, 0.16), transparent 32%, rgba(245, 196, 91, 0.12)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.09), transparent 42%);
  opacity: 0.7;
  pointer-events: none;
}

.menu-card > * {
  position: relative;
}

.menu-kicker {
  color: var(--cyan);
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
}

.menu-signal {
  display: grid;
  grid-template-columns: repeat(3, 44px);
  gap: 8px;
}

.menu-signal span {
  position: relative;
  display: block;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.025)),
    #17242b;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.menu-signal span:nth-child(1) {
  background: linear-gradient(145deg, #9bd3ff, #58aaf2);
}

.menu-signal span:nth-child(2) {
  background: linear-gradient(145deg, #9cf3c2, #54d995);
}

.menu-signal span:nth-child(3) {
  background: linear-gradient(145deg, #ffe38a, #f0b94c);
}

.menu-card strong {
  font-size: 2rem;
  line-height: 1;
}

.menu-meta {
  min-height: 1.2em;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 750;
}

.menu-button {
  width: 100%;
  min-height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: linear-gradient(135deg, #f5c45b, #6de1a6 60%, #68b7ff);
  color: #081013;
  font-weight: 950;
  box-shadow: 0 14px 34px rgba(70, 214, 202, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.menu-button:hover {
  filter: brightness(1.05) saturate(1.05);
}

.menu-button:focus-visible {
  filter: brightness(1.05) saturate(1.05);
  outline: 3px solid rgba(104, 183, 255, 0.68);
  outline-offset: 3px;
}

body[data-game-state="paused"] .status-dot {
  background: var(--muted);
  box-shadow: 0 0 0 5px rgba(169, 183, 191, 0.13);
}

body[data-game-state="won"] .status-dot {
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(245, 196, 91, 0.13);
}

body[data-game-state="lost"] .status-dot {
  background: var(--danger);
  box-shadow: 0 0 0 5px rgba(255, 111, 97, 0.13);
}

body[data-flag-mode="true"] .mine-board {
  cursor: crosshair;
}

body[data-flag-mode="true"] .board-shell {
  border-color: rgba(245, 196, 91, 0.44);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28), 0 0 0 3px rgba(245, 196, 91, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.08), inset 0 -18px 50px rgba(0, 0, 0, 0.14);
}

.board-shell.is-cleared {
  animation: clear-glow 920ms ease-out;
}

@keyframes reveal-pop {
  0% {
    filter: brightness(1.25);
    transform: scale(0.96);
  }
  100% {
    filter: brightness(1);
    transform: scale(1);
  }
}

@keyframes danger-pop {
  0% {
    transform: scale(0.88);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes clear-glow {
  0% {
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28), 0 0 0 rgba(245, 196, 91, 0), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  }
  38% {
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28), 0 0 80px rgba(245, 196, 91, 0.28), 0 0 120px rgba(70, 214, 202, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  }
  100% {
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28), 0 0 0 rgba(245, 196, 91, 0), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  }
}

@media (max-width: 760px) {
  .sweep-app {
    gap: 8px;
    padding: 8px;
  }

  .titlebar {
    align-items: stretch;
    min-height: auto;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .brand-title strong {
    font-size: 1.05rem;
  }

  .document-name {
    display: none;
  }

  .game-nav {
    display: grid;
    flex: 0 0 min(220px, 58%);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .game-nav a,
  .game-nav button {
    min-height: 44px;
    padding: 0 7px;
    font-size: 0.76rem;
  }

  .game-hud {
    align-items: stretch;
    flex-direction: column;
    gap: 7px;
    padding: 8px;
  }

  .hud-cluster {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .stat-chip {
    min-height: 50px;
    padding: 7px 6px;
  }

  .stat-chip span {
    font-size: 0.58rem;
  }

  .stat-chip strong {
    font-size: 1rem;
  }

  .hud-status {
    justify-content: center;
    min-width: 0;
    padding: 2px 6px 0;
  }

  .round-status {
    font-size: 0.84rem;
  }

  .difficulty-bar {
    gap: 6px;
    padding: 6px;
  }

  .difficulty-bar::before {
    display: none;
  }

  .difficulty-bar button {
    min-width: 0;
    flex: 1 1 0;
    min-height: 44px;
    padding: 0 8px;
    font-size: 0.78rem;
  }

  .board-shell {
    --cell: clamp(28px, min(calc((100vw - 42px) / var(--cols)), calc((100svh - 318px) / var(--rows))), 40px);
    height: calc(100svh - 286px);
    padding: 6px;
  }

  .mine-board {
    gap: 2px;
    padding: 4px;
  }

  .cell {
    border-radius: 6px;
  }

  .menu-card {
    gap: 10px;
    padding: 16px;
  }

  .menu-card strong {
    font-size: 1.62rem;
  }

  .menu-signal {
    grid-template-columns: repeat(3, 38px);
  }

  .menu-signal span {
    width: 38px;
    height: 38px;
  }
}

@media (max-width: 430px) {
  .brand-title strong {
    max-width: 112px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .stat-chip:nth-child(4) {
    display: none;
  }

  .hud-cluster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-height: 640px) {
  .sweep-app {
    gap: 6px;
    padding: 6px;
  }

  .titlebar {
    padding: 7px;
  }

  .game-hud,
  .difficulty-bar {
    padding: 6px;
  }

  .board-shell {
    --cell: clamp(28px, min(calc((100vw - 42px) / var(--cols)), calc((100svh - 318px) / var(--rows))), 38px);
    height: calc(100svh - 286px);
    padding: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .game-nav a:hover,
  .game-nav button:hover:not(:disabled),
  .difficulty-bar button:hover,
  .cell:hover:not(:disabled),
  .menu-button:hover {
    transform: none;
    filter: none;
  }
}