:root {
  --bg: #0a0e1a;
  --card-bg: #141b2d;
  --card-border: #1e2a42;
  --text: #e0e6f0;
  --text-secondary: #8892a4;
  --accent: #4fc3f7;
  --green: #00e676;
  --yellow: #ffeb3b;
  --red: #ff5252;
  --blue: #448aff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 32px;
  -webkit-font-smoothing: antialiased;
}

.header { padding: 24px 0 16px; text-align: center; }
.header h1 { font-size: 1.5rem; color: var(--accent); font-weight: 700; }
.header .subtitle, .subtitle { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
  border: 1px solid var(--card-border);
}

.status-card { text-align: center; }
.status-card .value { font-size: 3rem; font-weight: 700; line-height: 1.2; color: var(--accent); }
.status-card .label { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 4px; }
.status-card .unit { font-size: 0.85rem; color: var(--text-secondary); margin-top: 2px; }

.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 8px;
}
.badge.good { background: rgba(0,230,118,0.15); color: var(--green); }
.badge.normal { background: rgba(68,138,255,0.15); color: var(--blue); }
.badge.warning { background: rgba(255,235,59,0.15); color: var(--yellow); }
.badge.danger { background: rgba(255,82,82,0.15); color: var(--red); }

.stats-row { display: flex; justify-content: space-around; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--card-border); }
.stats-row .stat { text-align: center; flex: 1; }
.stats-row .stat-value { font-size: 1.1rem; font-weight: 600; }
.stats-row .stat-label { font-size: 0.7rem; color: var(--text-secondary); margin-top: 2px; }

.card-title { font-size: 1rem; font-weight: 600; margin-bottom: 12px; color: var(--text); }

.chart-container { height: 300px; width: 100%; }

.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tab {
  padding: 6px 16px;
  border-radius: 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}
.tab.active { background: var(--accent); color: #000; border-color: var(--accent); font-weight: 600; }

.btn {
  padding: 14px 24px;
  border-radius: 12px;
  border: none;
  background: var(--accent);
  color: #000;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  width: 100%;
  transition: opacity 0.2s;
}
.btn:active { opacity: 0.7; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.alert-item { padding: 12px 16px; border-radius: 12px; margin-bottom: 8px; font-size: 0.85rem; line-height: 1.5; }
.alert-item.warning { background: rgba(255,235,59,0.08); border-left: 3px solid var(--yellow); color: var(--yellow); }
.alert-item.critical { background: rgba(255,82,82,0.08); border-left: 3px solid var(--red); color: var(--red); }

.date-picker {
  float: right;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 0.8rem;
}

.footer { padding: 16px 0 32px; text-align: center; }

.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.8);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.modal {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 28px;
  width: 90%;
  max-width: 380px;
  border: 1px solid var(--card-border);
}
.modal h2 { margin-bottom: 8px; color: var(--accent); font-size: 1.2rem; }
.modal input {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  margin-top: 12px;
  outline: none;
}
.modal input:focus { border-color: var(--accent); }

.hidden { display: none !important; }

.loading { text-align: center; padding: 40px 0; color: var(--text-secondary); font-size: 0.9rem; }

.toast {
  position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%);
  background: var(--card-bg); color: var(--text);
  padding: 12px 24px; border-radius: 12px;
  border: 1px solid var(--card-border);
  font-size: 0.85rem; z-index: 200;
  animation: fadeInUp 0.3s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}