/* ── Reset & base typography ──────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--ui-font, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif);
  font-size: 15px;
  line-height: 1.4;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.2s, color 0.2s;
}

/* Terminal: monospace throughout */
body.theme-terminal {
  font-family: "Courier New", Courier, monospace;
}

/* ── Screen reader live region ────────────────────────────────────────── */
#sr-live {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ── Header ───────────────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  transition: background 0.2s, border-color 0.2s;
}

header h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

body.theme-terminal header {
  border-bottom: 1px solid var(--accent);
  box-shadow: 0 1px 0 0 var(--accent);
}

body.theme-terminal header h1 {
  color: var(--accent);
  text-shadow: 0 0 8px rgba(57,255,20,0.4);
  letter-spacing: 0.15em;
}

body.theme-mountain header {
  color: #e8f0f7;
  border-bottom-color: #2d5878;
}

body.theme-mountain header h1 {
  color: #f7fafc;
  letter-spacing: 0.06em;
}

body.theme-coffee header {
  color: #f5ede0;
  border-bottom-color: #7c4f22;
}

body.theme-coffee header h1 {
  color: #f5ede0;
}

body.theme-school header {
  border-bottom: 2px solid #b8c4d4;
}

/* ── Theme control (header right) ────────────────────────────────────── */
.theme-control {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

body.theme-mountain .theme-control {
  color: #adc6de;
}

body.theme-coffee .theme-control {
  color: #c9a97a;
}

.theme-control label {
  white-space: nowrap;
}

/* ── Main layout ──────────────────────────────────────────────────────── */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px 32px;
  gap: 24px;
}

body.theme-coffee main {
  background: linear-gradient(160deg, #3b2a1a 0%, #4a3020 50%, #3b2a1a 100%);
}

body.theme-school main {
  background-color: #f8f5e6;
  background-image: repeating-linear-gradient(
    transparent,
    transparent 27px,
    #a8b8cc 27px,
    #a8b8cc 28px
  );
  background-position: 0 14px;
}

body.theme-mountain main {
  background: linear-gradient(175deg, #d4e8f5 0%, #e8f0f7 40%, #f0f5fa 100%);
}

body.theme-terminal main {
  background: #0d0d0d;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.15) 2px,
    rgba(0,0,0,0.15) 4px
  );
}

/* ── Game area layout ─────────────────────────────────────────────────── */
.game-area {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 32px;
  width: 100%;
  max-width: 860px;
  justify-content: center;
}

.left-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-shrink: 0;
}

.right-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 220px;
  flex-shrink: 0;
}

/* ── Responsive: mobile ───────────────────────────────────────────────── */
@media (max-width: 720px) {
  header {
    padding: 12px 16px;
  }

  header h1 {
    font-size: 16px;
  }

  main {
    padding: 16px 12px 28px;
    gap: 16px;
  }

  .game-area {
    flex-direction: column;
    align-items: center;
    gap: 18px;
  }

  .left-col {
    width: 100%;
    align-items: center;
  }

  .right-col {
    width: 100%;
    max-width: 414px;
  }
}