:root {
  --green: #1a8a92;
  --green-light: #147880;
  --coral: #993C1D;
  --coral-light: #b84622;
  --bg: #f5f5f5;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #666;
  --border: #e0e0e0;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Pages */
.page { display: none; }
.page.active { display: block; }

/* Login */
.login-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-logo {
  text-align: center;
  margin-bottom: 40px;
}

.logo-icon-img {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  display: block;
  margin: 0 auto 16px;
}

.login-logo h1 { font-size: 28px; font-weight: 700; color: var(--green); }
.login-logo p { color: var(--text-muted); margin-top: 4px; font-size: 14px; }

.login-form {
  width: 100%;
  max-width: 360px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-muted); }
.form-group input {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus { border-color: var(--green); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--green); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--green-light); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--border); }
.btn-full { width: 100%; margin-top: 8px; padding: 13px; font-size: 16px; }
.btn-sm { padding: 7px 13px; font-size: 13px; }

.btn-start {
  background: var(--green);
  color: white;
  flex: 1;
  padding: 14px;
  font-size: 16px;
  border-radius: 10px;
}
.btn-start:hover:not(:disabled) { background: var(--green-light); }

.btn-stop {
  background: var(--coral);
  color: white;
  flex: 1;
  padding: 14px;
  font-size: 16px;
  border-radius: 10px;
}
.btn-stop:hover:not(:disabled) { background: var(--coral-light); }

/* Error */
.error-msg { color: var(--coral); font-size: 13px; padding: 8px 0; }
.hidden { display: none !important; }

/* Header */
.app-header {
  background: white;
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-logo { display: flex; align-items: center; gap: 8px; }
.header-icon-img { width: 32px; height: 32px; border-radius: 8px; }
.header-title { font-weight: 700; font-size: 18px; color: var(--green); }
.header-user { display: flex; align-items: center; gap: 8px; }
.user-name { font-size: 13px; color: var(--text-muted); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Tabs */
.tab-nav {
  background: white;
  border-bottom: 1px solid var(--border);
  display: flex;
  padding: 0 16px;
}

.tab-btn {
  background: none;
  border: none;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }

.tab-content { display: none; padding: 16px; }
.tab-content.active { display: block; }

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.card-title { font-size: 15px; font-weight: 700; margin-bottom: 12px; color: var(--text); }

/* Charger Card */
.charger-card { margin-bottom: 12px; }
.charger-header { display: flex; justify-content: space-between; align-items: flex-start; }
.charger-name { font-size: 18px; font-weight: 700; }
.charger-meta { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* Status Badge */
.status-badge {
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.status-charging { background: #daf0f1; color: var(--green); }
.status-available { background: #f0f0f0; color: #555; }
.status-offline { background: #fce8e3; color: var(--coral); }
.status-preparing { background: #fff3cd; color: #856404; }
.status-finishing { background: #e3f2fd; color: #0d47a1; }

/* Timer */
.session-timer {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.timer-label { font-size: 13px; color: var(--text-muted); }
.timer-value { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--green); }

/* Metrics */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

.metric-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-align: center;
  box-shadow: var(--shadow);
}
.metric-label { font-size: 11px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 4px; }
.metric-value { font-size: 22px; font-weight: 700; color: var(--text); }
.metric-unit { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* Control Buttons */
.control-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

/* Recent Sessions */
.recent-list { display: flex; flex-direction: column; gap: 0; }

.session-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.session-item:last-child { border-bottom: none; }

.session-user { font-size: 13px; font-weight: 600; }
.session-date { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.session-kwh { font-size: 15px; font-weight: 700; color: var(--green); }
.session-duration { font-size: 12px; color: var(--text-muted); text-align: right; }

.empty-state { text-align: center; color: var(--text-muted); font-size: 14px; padding: 20px 0; }

/* History Table */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  text-align: left;
  padding: 8px 10px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #fafafa; }

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.page-btn {
  padding: 6px 14px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  background: white;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.page-btn:hover { border-color: var(--green); color: var(--green); }
.page-btn.active { background: var(--green); color: white; border-color: var(--green); }

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-value { font-size: 28px; font-weight: 800; color: var(--green); }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; font-weight: 600; }

/* Install Banner */
.install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
  z-index: 200;
}
.install-text { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; }
.install-icon { font-size: 20px; }
.install-actions { display: flex; gap: 8px; }

/* Charts */
.chart-card { margin-top: 12px; }
.chart-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.chart-wrap canvas { display: block; max-width: 100%; }
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-muted);
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

@media (max-width: 360px) {
  .metrics-grid { grid-template-columns: repeat(3, 1fr); }
  .metric-value { font-size: 18px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}