:root {
  --text-main: #102646;
  --text-muted: #5c738f;
  --primary: #1787ff;
  --aqua: #11c4de;
  --panel-bg: rgba(255, 255, 255, 0.9);
  --panel-border: rgba(41, 108, 210, 0.2);
  --shadow-main: 0 20px 48px rgba(19, 55, 122, 0.14);
  --radius-lg: 16px;
  --radius-md: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  font-family: "Exo 2", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  line-height: 1.6;
  background:
    linear-gradient(rgba(23, 135, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 135, 255, 0.04) 1px, transparent 1px),
    radial-gradient(circle at 6% -4%, rgba(23, 135, 255, 0.2) 0%, rgba(23, 135, 255, 0) 38%),
    radial-gradient(circle at 100% 0%, rgba(17, 196, 222, 0.18) 0%, rgba(17, 196, 222, 0) 42%),
    linear-gradient(180deg, #f7faff 0%, #eef3fb 100%);
  background-size: 22px 22px, 22px 22px, auto, auto, auto;
}

.app-shell {
  width: min(1200px, 100%);
  padding: 18px 16px calc(18px + env(safe-area-inset-bottom));
  display: grid;
  gap: 14px;
}

.top-card,
.control-card,
.board-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-main);
  backdrop-filter: blur(4px);
}

.top-card {
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand-title {
  margin: 0;
  font-family: "Orbitron", "Exo 2", sans-serif;
  letter-spacing: 0.08em;
  font-size: clamp(20px, 2.2vw, 28px);
}

.brand-subtitle {
  margin: 2px 0 0;
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.03em;
}

.status-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(96px, 1fr));
  gap: 10px;
  width: min(460px, 100%);
}

.metric-item {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(41, 108, 210, 0.16);
  border-radius: 12px;
  padding: 10px;
  min-height: 66px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
}

.metric-value {
  margin-top: 2px;
  font-size: 18px;
  line-height: 1.2;
  font-family: "Orbitron", "Exo 2", sans-serif;
  color: var(--text-main);
}

.control-card {
  padding: 14px;
  display: grid;
  gap: 12px;
}

.control-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, minmax(90px, 1fr));
  gap: 10px;
  align-items: end;
}

.field-group {
  display: grid;
  gap: 6px;
}

.field-label {
  font-size: 13px;
  color: var(--text-muted);
}

select.layui-input,
input.layui-input {
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(41, 108, 210, 0.22);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-main);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.layui-btn {
  height: 40px;
  line-height: 40px;
  border-radius: 10px;
  border: none;
  min-width: 110px;
}

.layui-btn-sm {
  height: 32px;
  line-height: 32px;
}

.layui-btn-xs {
  height: 24px;
  line-height: 24px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--aqua));
}

.btn-secondary {
  border: 1px solid rgba(41, 108, 210, 0.3);
  color: #1e5fc6;
  background: rgba(255, 255, 255, 0.88);
}

.tips-line {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.board-card {
  padding: 12px;
}

.board-wrapper {
  width: 100%;
  overflow: auto;
  border-radius: 12px;
  border: 1px solid rgba(41, 108, 210, 0.16);
  padding: 8px;
  background: rgba(255, 255, 255, 0.62);
}

.board {
  --cell-size: 34px;
  display: grid;
  gap: 6px;
  width: max-content;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid rgba(37, 99, 191, 0.18);
  border-radius: 10px;
  background: linear-gradient(150deg, #ffffff, #ecf4ff);
  box-shadow: 0 6px 12px rgba(16, 38, 70, 0.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 17px;
  color: #19447e;
  cursor: pointer;
  user-select: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.cell:hover {
  transform: translateY(-1px);
}

.cell:focus-visible {
  outline: 2px solid rgba(23, 135, 255, 0.45);
  outline-offset: 2px;
}

.cell.revealed {
  cursor: default;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: inset 0 1px 2px rgba(16, 38, 70, 0.1);
}

.cell.flagged {
  color: #f04959;
}

.cell.question {
  color: #436187;
}

.cell.mine {
  background: #ffe8eb;
  color: #c02234;
}

.cell.exploded {
  background: #ffccd2;
  border-color: #e84f62;
}

.cell.n-1 { color: #1b67d2; }
.cell.n-2 { color: #268448; }
.cell.n-3 { color: #df5b2f; }
.cell.n-4 { color: #7b4ee0; }
.cell.n-5 { color: #b62958; }
.cell.n-6 { color: #0e8b92; }
.cell.n-7 { color: #303b4e; }
.cell.n-8 { color: #09152a; }

.cell.hint-safe {
  border-color: #25a65c;
  box-shadow: 0 0 0 3px rgba(37, 166, 92, 0.22);
}

.cell.hint-mine {
  border-color: #d23f58;
  box-shadow: 0 0 0 3px rgba(210, 63, 88, 0.22);
}

@media (max-width: 1100px) {
  .top-card {
    flex-direction: column;
    align-items: stretch;
  }

  .status-metrics {
    width: 100%;
  }

  .control-grid {
    grid-template-columns: repeat(2, minmax(130px, 1fr));
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 12px 10px calc(14px + env(safe-area-inset-bottom));
  }

  .control-grid {
    grid-template-columns: 1fr;
  }

  .status-metrics {
    grid-template-columns: repeat(3, minmax(80px, 1fr));
    gap: 8px;
  }

  .metric-item {
    min-height: 60px;
    padding: 8px;
  }

  .metric-value {
    font-size: 16px;
  }

  .layui-btn {
    height: 44px;
    line-height: 44px;
    flex: 1;
    min-width: 0;
  }

  .board {
    gap: 4px;
  }
}

@media (max-width: 420px) {
  .status-metrics {
    grid-template-columns: 1fr;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}