:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --green: #16a34a;
  --amber: #f59e0b;
  --red: #dc2626;
  --blue: #2563eb;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 1rem 1.5rem;
  gap: 1rem;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 1.1rem;
}

.clock { margin-right: auto; }

.pill {
  padding: 0.2rem 0.8rem;
  border-radius: 999px;
  background: var(--panel);
  font-size: 1rem;
}
.pill.online { color: #bbf7d0; }
.pill.offline { color: #fecaca; background: #7f1d1d; }
.pill.pending { color: #fde68a; background: #78350f; }
.pill.notice { color: #fed7aa; background: #7c2d12; }

#logout {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--muted);
  border-radius: 0.5rem;
  padding: 0.3rem 0.9rem;
  font-size: 1rem;
  cursor: pointer;
}

.banner {
  background: #78350f;
  color: #fde68a;
  padding: 0.6rem 1rem;
  border-radius: 0.5rem;
  font-size: 1.2rem;
}
.banner a { color: #fff; }

/* 三栏：左边两块宽的（学生已用餐、学生还剩），右边一块窄的（老师） */
.counters {
  flex: 1;
  display: grid;
  grid-template-columns: 5fr 5fr 3fr;
  gap: 1rem;
}

.counter {
  background: var(--panel);
  border-radius: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.counter .label {
  font-size: clamp(1.2rem, 2.6vw, 2.4rem);
  color: var(--muted);
}

.counter .number {
  font-size: clamp(6rem, 17vw, 24rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.counter.eaten .number { color: #4ade80; }
.counter.remaining .number { color: #fbbf24; }

/* 老师那一栏窄一些，数字和标签相应小一档，但仍然是大字 */
.counter.teachers-counter .label { font-size: clamp(1.1rem, 1.9vw, 2rem); text-align: center; }
.counter.teachers-counter .number { font-size: clamp(5rem, 12vw, 16rem); color: #93c5fd; }

/* 窄屏（竖屏平板、小窗口）：两块学生并排，老师一整行放在下面 */
@media (max-width: 900px) {
  .counters { grid-template-columns: 1fr 1fr; }
  .counter.teachers-counter { grid-column: 1 / -1; }
}

.result {
  border-radius: 1.5rem;
  padding: 1rem 1.5rem;
  text-align: center;
  background: var(--panel);
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.result-title { font-size: clamp(2rem, 5vw, 4.5rem); font-weight: 700; }
.result-detail { font-size: clamp(1.2rem, 2.4vw, 2.2rem); opacity: 0.9; }
.result.ok { background: var(--green); }
.result.warn { background: var(--amber); color: #1c1917; }
.result.bad { background: var(--red); }

.scanbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

#scan {
  flex: 1;
  font-size: 1.6rem;
  padding: 0.8rem 1rem;
  border-radius: 0.75rem;
  border: 3px solid var(--blue);
  background: #fff;
  color: #0f172a;
}

/* 登录页 */
.login-page { align-items: center; justify-content: center; }
.login-card {
  background: var(--panel);
  border-radius: 1rem;
  padding: 2rem;
  width: min(26rem, 100%);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.login-card h1 { margin: 0 0 0.5rem; font-size: 1.8rem; }
.login-card input {
  font-size: 1.3rem;
  padding: 0.7rem 0.9rem;
  border-radius: 0.5rem;
  border: 2px solid var(--blue);
}
.login-card button {
  font-size: 1.2rem;
  padding: 0.7rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
}
.login-error { margin: 0; color: #fecaca; }