:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #2563eb;
  --accent-2: #1d4ed8;
  --border: #374151;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.top-nav {
  height: 56px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.top-nav-links {
  display: flex;
  gap: 14px;
  font-size: 14px;
}

.top-nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.top-nav-links a:hover {
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 56px);
}

.side-nav {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 12px;
}

.side-nav h3 {
  margin: 8px 8px 12px;
  color: var(--muted);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-btn {
  width: 100%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
  display: block;
}

.nav-btn:hover {
  background: var(--panel-2);
  border-color: var(--border);
}

.nav-btn.active {
  background: var(--accent);
  border-color: var(--accent-2);
  font-weight: 600;
}

main {
  padding: 20px;
  background: #0b1220;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  max-width: 900px;
}

.dashboard-panel {
  max-width: none;
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 24px;
}

.panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.dashboard-section-title {
  margin: 18px 0 8px;
  font-size: 18px;
}

.snapshot-status {
  margin: 0 0 12px;
}

.snapshot-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.snapshot-card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.snapshot-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}

.snapshot-card h4 {
  margin: 0 0 6px;
  font-size: 15px;
}

.snapshot-label {
  font-size: 13px;
}

.snapshot-date {
  margin: 0 0 10px;
  font-size: 13px;
}

.snapshot-card-body {
  display: grid;
  gap: 12px;
}

.snapshot-section {
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.snapshot-section h5 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.snapshot-metrics {
  display: grid;
  gap: 6px;
}

.snapshot-metric {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 14px;
}

.snapshot-metric strong {
  font-weight: 600;
}

.snapshot-close-block {
  display: grid;
  gap: 4px;
  text-align: right;
}

.snapshot-close-block span,
.snapshot-close-block small {
  color: var(--muted);
}

.snapshot-close-block strong {
  font-size: 22px;
  line-height: 1;
}

.error-text {
  color: #fca5a5;
}

.positive-text {
  color: #4ade80;
}

.negative-text {
  color: #f87171;
}

/* Login page */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 32px;
  width: 100%;
  max-width: 380px;
}

.login-title {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
}

.login-subtitle {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

.login-label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.login-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 14px;
  margin-bottom: 16px;
  outline: none;
}

.login-input:focus {
  border-color: var(--accent);
}

.login-error {
  color: #fca5a5;
  font-size: 13px;
  min-height: 18px;
  margin: 0 0 12px;
}

.login-btn {
  width: 100%;
  padding: 11px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.login-btn:hover:not(:disabled) {
  background: var(--accent-2);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Logout button in top nav */
.logout-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

.logout-btn:hover {
  color: var(--text);
  border-color: var(--text);
}

@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .side-nav {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .nav-btn {
    width: auto;
  }
}