:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #283548;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.3);
  --accent: #10b981;
  --danger: #ef4444;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  line-height: 1.5;
}

.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navbar */
.navbar {
  background: rgba(30, 41, 59, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo {
  font-size: 24px;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.nav-brand h2 {
  font-size: 18px;
  font-weight: 700;
}

.nav-brand small {
  color: var(--text-muted);
  font-size: 11px;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 14px;
}

.user-greeting {
  font-size: 13px;
  color: var(--text-muted);
}

/* Container */
.container {
  max-width: 1020px;
  width: 100%;
  margin: 28px auto;
  padding: 0 16px;
  flex: 1;
}

/* Auth Card */
.auth-card {
  max-width: 420px;
  margin: 40px auto;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  padding: 28px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.auth-tab {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 10px;
  cursor: pointer;
}

.auth-tab.active {
  color: var(--primary);
  border-color: var(--primary);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  background: #0f172a;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}

.form-group input:focus {
  border-color: var(--primary);
}

.auth-alert {
  margin-top: 16px;
  padding: 10px;
  border-radius: 6px;
  font-size: 13px;
  text-align: center;
}

.auth-alert.error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.auth-alert.success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
}

/* Dashboard Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.stat-icon {
  font-size: 32px;
  background: #0f172a;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.stat-details {
  display: flex;
  flex-direction: column;
}

.stat-title {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.stat-num {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

/* Notice Banner */
.notice-banner {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 10px;
  padding: 14px 18px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 24px;
  font-size: 13px;
}

.notice-icon {
  font-size: 18px;
}

/* Dashboard Sections */
.dashboard-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.section-header h3 {
  font-size: 16px;
  font-weight: 600;
}

/* Devices List */
.devices-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.device-item {
  background: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.device-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.device-icon {
  font-size: 22px;
}

.device-name {
  font-size: 14px;
  font-weight: 600;
}

.device-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.status-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
  margin-left: 8px;
}

.status-pill.online {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent);
}

.status-pill.offline {
  background: rgba(148, 163, 184, 0.2);
  color: var(--text-muted);
}

.device-actions {
  display: flex;
  gap: 8px;
}

/* History Table */
.history-table-container {
  overflow-x: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.history-table th {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-weight: 600;
}

.history-table td {
  padding: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.history-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-primary {
  background: #2563eb;
  color: white;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-secondary {
  background: #334155;
  color: #f8fafc;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-danger {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: white;
}

.btn-block {
  width: 100%;
  padding: 12px;
  font-size: 14px;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: var(--text-muted);
}