/* =========================================================================
   BRAIN GAMES — ARCADE THEME (amber · rose · teal)
   Same layout conventions as the rest of the hub (breadcrumb, site-header,
   card system, footer disclaimer) with a playful arcade palette.
========================================================================= */

:root {
  --grad-1: #f59e0b;
  --grad-2: #fb7185;
  --grad-3: #14b8a6;
  --accent: #d97706;
  --ink: #1f2333;
  --ink-soft: #5b5f74;
  --bg: #fffaf0;
  --card-bg: #ffffff;
  --border: #f3e8d2;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(245, 158, 11, 0.10);
  --shadow-hover: 0 16px 40px rgba(245, 158, 11, 0.18);
  --good: #16a34a;
  --bad: #dc2626;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #fffaf0 0%, #fff1f2 50%, #f0fdfa 100%);
  color: var(--ink);
  min-height: 100vh;
}

.breadcrumb-bar {
  background: #fff7ed;
  border-bottom: 1px solid var(--border);
  padding: 8px 24px;
  font-size: 0.85rem;
}
.breadcrumb-bar a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.breadcrumb-bar a:hover { text-decoration: underline; }
.breadcrumb-bar .sep { color: #a8977a; margin: 0 6px; }

.site-header {
  padding: 18px 24px;
  background: linear-gradient(120deg, var(--grad-1), var(--grad-2) 60%, var(--grad-3));
  box-shadow: var(--shadow);
}
.site-header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.logo {
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.2px;
}

.app-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 16px 60px;
}

.intro {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.intro h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
}
.intro p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.55;
  font-size: 0.95rem;
}

/* ---------------- Tabs ---------------- */
.tab-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.tab-btn {
  flex: 1 1 160px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  text-align: center;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink-soft);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}
.tab-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}
.tab-btn.active {
  color: #fff;
  background: linear-gradient(120deg, var(--grad-1), var(--grad-2));
  border-color: transparent;
}
.tab-btn .tab-emoji {
  display: block;
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.game-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow);
  min-height: 320px;
}
.game-panel h2 {
  margin: 0 0 6px;
  font-size: 1.2rem;
}
.game-sub {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin: 0 0 20px;
  line-height: 1.5;
}

.btn {
  display: inline-block;
  background: linear-gradient(120deg, var(--grad-1), var(--grad-2));
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-hover); }
.btn:disabled { opacity: 0.5; cursor: default; transform: none; box-shadow: none; }
.btn.secondary {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--border);
}
.btn.small { padding: 6px 14px; font-size: 0.8rem; }

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}

select, .select {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.88rem;
  background: #fff;
  color: var(--ink);
}

/* ---------------- Trivia ---------------- */
.trivia-progress {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.trivia-question {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 18px;
  line-height: 1.5;
}
.trivia-options {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
}
.trivia-option {
  text-align: left;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.trivia-option:hover { border-color: var(--grad-1); }
.trivia-option.correct { background: #ecfdf5; border-color: var(--good); color: var(--good); font-weight: 700; }
.trivia-option.incorrect { background: #fef2f2; border-color: var(--bad); color: var(--bad); font-weight: 700; }
.trivia-option:disabled { cursor: default; }
.trivia-score {
  font-weight: 700;
  color: var(--accent);
}
.trivia-result {
  text-align: center;
  padding: 20px 0;
}
.trivia-result .big-score {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  margin: 6px 0;
}

/* ---------------- Reaction ---------------- */
.reaction-box {
  height: 260px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
  padding: 20px;
}
.reaction-box.idle { background: linear-gradient(120deg, #94a3b8, #64748b); }
.reaction-box.waiting { background: linear-gradient(120deg, var(--bad), #b91c1c); }
.reaction-box.go { background: linear-gradient(120deg, var(--good), #15803d); }
.reaction-box.early { background: linear-gradient(120deg, #f59e0b, #b45309); }
.reaction-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.reaction-stat {
  background: #fff7ed;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
}
.reaction-stat .val {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent);
}
.reaction-stat .lbl {
  font-size: 0.75rem;
  color: var(--ink-soft);
}

/* ---------------- Sudoku ---------------- */
.sudoku-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, minmax(28px, 42px));
  grid-template-rows: repeat(9, minmax(28px, 42px));
  border: 2px solid var(--ink);
  margin-bottom: 18px;
}
.sudoku-cell {
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 600;
  background: #fff;
}
.sudoku-cell.given { background: #fff7ed; color: var(--ink); }
.sudoku-cell input {
  width: 100%;
  height: 100%;
  border: none;
  text-align: center;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  background: transparent;
}
.sudoku-cell input:focus { outline: 2px solid var(--grad-1); }
.sudoku-cell.conflict { background: #fef2f2; }
.sudoku-cell.border-right { border-right: 2px solid var(--ink); }
.sudoku-cell.border-bottom { border-bottom: 2px solid var(--ink); }
.sudoku-status {
  font-weight: 700;
  margin-bottom: 10px;
}
.sudoku-status.ok { color: var(--good); }
.sudoku-status.bad { color: var(--bad); }

/* ---------------- 2048 ---------------- */
.puzzle2048-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.puzzle2048-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(56px, 76px));
  grid-template-rows: repeat(4, minmax(56px, 76px));
  gap: 8px;
  background: #eee0c8;
  border-radius: var(--radius-md);
  padding: 8px;
  margin-bottom: 14px;
  touch-action: none;
}
.p2048-cell {
  background: rgba(255,255,255,0.35);
  border-radius: var(--radius-sm);
}
.p2048-tile {
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.3rem;
  color: #5b4636;
  background: #eee4d3;
}
.p2048-tile[data-v="2"] { background: #eee4da; }
.p2048-tile[data-v="4"] { background: #ede0c8; }
.p2048-tile[data-v="8"] { background: #f2b179; color: #fff; }
.p2048-tile[data-v="16"] { background: #f59563; color: #fff; }
.p2048-tile[data-v="32"] { background: #f67c5f; color: #fff; }
.p2048-tile[data-v="64"] { background: #f65e3b; color: #fff; }
.p2048-tile[data-v="128"] { background: #edcf72; color: #fff; font-size: 1.1rem; }
.p2048-tile[data-v="256"] { background: #edcc61; color: #fff; font-size: 1.1rem; }
.p2048-tile[data-v="512"] { background: #edc850; color: #fff; font-size: 1.1rem; }
.p2048-tile[data-v="1024"] { background: #edc53f; color: #fff; font-size: 0.95rem; }
.p2048-tile[data-v="2048"] { background: #edc22e; color: #fff; font-size: 0.95rem; }
.p2048-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.game-error {
  color: var(--bad);
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.88rem;
}

.site-footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.8rem;
  padding: 20px;
}