:root {
  --bg-color: #0b132b;
  --card-bg: #1c2541;
  --accent-color: #00b4d8;
  --text-color: #ffffff;
  --text-dim: #8d99ae;
  --border-color: #2a3a5e;
  --online-green: #2ecc71;
  --error-red: #ff4d4d;
  --temp-cold: #00b4d8;
  --temp-good: #2ecc71;
  --temp-warm: #ff9f43;
}

* {
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: #050a18;
  color: var(--text-color);
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.app-container {
  width: 100%;
  max-width: 390px;
  height: 100vh;
  max-height: 820px;
  background-color: var(--bg-color);
  border-radius: 28px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  border: 1px solid #202b48;
}

.status-bar {
  padding: 12px 20px 5px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-dim);
}

.app-header {
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(42, 58, 94, 0.4);
}

.app-title {
  font-size: 16px;
  font-weight: bold;
  color: var(--accent-color);
  letter-spacing: 1px;
}

.header-status {
  font-size: 11px;
  color: var(--online-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--online-green);
  border-radius: 50%;
}

.back-btn {
  background: none;
  border: none;
  color: var(--accent-color);
  font-size: 12px;
  cursor: pointer;
}

.app-body {
  flex: 1;
  overflow-y: auto;
  padding: 15px 20px;
  padding-bottom: 80px;
}

.page { display: none; }
.page.active { display: block; animation: fadeIn 0.25s ease-in-out; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.bottom-nav {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 65px;
  background-color: #080f23;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--text-dim);
  font-size: 9px;
  cursor: pointer;
  gap: 3px;
  border: none;
  background: none;
  width: 16.6%;
}

.nav-item.active { color: var(--accent-color); font-weight: bold; }
.nav-icon { font-size: 16px; }

.card {
  background-color: var(--card-bg);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 15px;
  border: 1px solid var(--border-color);
}

.card-title {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 0;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.device-count-badge {
  font-size: 11px;
  color: var(--accent-color);
}

.device-item {
  background-color: var(--card-bg);
  border-radius: 14px;
  padding: 12px 15px;
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.device-info { display: flex; flex-direction: column; gap: 3px; cursor: pointer; flex: 1; }
.device-name { font-size: 14px; font-weight: bold; }
.device-code { font-size: 11px; color: var(--text-dim); }

.rename-btn {
  background: #0b132b;
  border: 1px solid var(--border-color);
  color: var(--accent-color);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 11px;
  cursor: pointer;
}

.room-info-bar {
  display: flex;
  justify-content: space-between;
  background: rgba(28, 37, 65, 0.7);
  padding: 10px 15px;
  border-radius: 12px;
  margin-bottom: 15px;
  border: 1px solid var(--border-color);
  font-size: 12px;
}

.temp-circle-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 15px 0;
}

.temp-circle {
  width: 175px;
  height: 175px;
  border-radius: 50%;
  border: 8px solid var(--temp-good);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 25px rgba(46, 204, 113, 0.25);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
}

.main-temp-val { font-size: 44px; font-weight: bold; line-height: 1; }
.sub-temp-val { font-size: 11px; color: var(--text-dim); margin-top: 6px; }

.temp-controls {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 15px;
}

.circle-btn {
  font-size: 20px;
  font-weight: bold;
  width: 55px;
  height: 42px;
}

.quick-actions {
  display: flex;
  justify-content: space-between;
  gap: 4px;
}

.action-btn {
  flex: 1;
  background-color: #0b132b;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 8px 3px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 10px;
  cursor: pointer;
}

.action-btn.active {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

.chart-timeframe-selector {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.tf-btn {
  flex: 1;
  background-color: #0b132b;
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  padding: 6px 2px;
  border-radius: 8px;
  font-size: 10px;
  cursor: pointer;
}

.tf-btn.active {
  background-color: var(--accent-color);
  color: white;
  font-weight: bold;
  border-color: var(--accent-color);
}

.chart-footer-label {
  text-align: center;
  font-size: 11px;
  color: var(--accent-color);
  margin-top: 10px;
  background: rgba(0, 180, 216, 0.1);
  padding: 6px;
  border-radius: 8px;
  border: 1px dashed var(--accent-color);
}

.eco-grid {
  display: flex;
  gap: 10px;
}

.eco-card {
  flex: 1;
  background-color: #0b132b;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.1s ease;
}

.eco-card:active { transform: scale(0.97); }
.eco-icon { font-size: 20px; margin-bottom: 4px; }
.eco-title { font-size: 12px; font-weight: bold; color: var(--accent-color); margin-bottom: 4px; }
.eco-desc { font-size: 9px; color: var(--text-dim); line-height: 1.3; }

.error-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
}

.error-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: #0b132b;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(42, 58, 94, 0.6);
}

.error-icon { font-size: 16px; }
.error-details { display: flex; flex-direction: column; gap: 2px; }
.error-title { font-size: 11px; font-weight: bold; color: var(--text-color); }
.error-time { font-size: 9px; color: var(--text-dim); }

.input-group { margin-bottom: 12px; text-align: right; }
.input-group label { display: block; font-size: 11px; color: var(--text-dim); margin-bottom: 4px; }
.input-group input, .input-group select, .input-group textarea {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background-color: #0b132b;
  color: white;
  direction: rtl;
  font-size: 12px;
}

.btn-submit {
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  width: 100%;
  font-size: 13px;
  margin-top: 8px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 10px auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.text-center { text-align: center; }