:root {
  color-scheme: dark;
  --bg0: #07111f;
  --bg1: #0c1b2e;
  --panel: rgba(12, 22, 38, 0.78);
  --panel-border: rgba(130, 170, 255, 0.16);
  --text: #e9f1ff;
  --muted: #8ea6c9;
  --up: #4be38b;
  --down: #ff6b6b;
  --accent: #7dc4ff;
  --accent-2: #9b8cff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(125, 196, 255, 0.14), transparent 32%),
    radial-gradient(circle at top right, rgba(155, 140, 255, 0.12), transparent 28%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.35), transparent 70%);
  pointer-events: none;
}

.shell {
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
  position: relative;
  z-index: 1;
}

.app-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  margin-bottom: 18px;
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.session-badge {
  padding: 10px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.session-badge span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.session-badge strong {
  display: block;
  margin-top: 4px;
}

.ghost-button,
.primary-button {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.ghost-button {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  padding: 10px 16px;
}

.primary-button {
  color: #06111f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  padding: 12px 18px;
}

.ghost-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
}

.hero {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 18px;
  align-items: end;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-size: 12px;
}

h1, h2, p { margin: 0; }
h1 {
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 0.95;
  max-width: 10ch;
}

.subtle, .chart-header p, .chart-footer, .status-detail, .meta span, .summary-grid span {
  color: var(--muted);
}

.status-card, .panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  border-radius: 22px;
}

.status-card {
  padding: 18px 20px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.status-label, .meta span, .summary-grid span {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.status-value {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 800;
  margin: 8px 0 6px;
}

.status-good { color: var(--up); }
.status-bad { color: var(--down); }

.controls {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 14px;
  margin-bottom: 18px;
}

.ranges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.range-btn {
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.range-btn:hover { transform: translateY(-1px); }
.range-btn.active {
  background: linear-gradient(135deg, rgba(125, 196, 255, 0.28), rgba(155, 140, 255, 0.24));
  border-color: rgba(125, 196, 255, 0.4);
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  min-width: 320px;
}

.meta strong, .summary-grid strong {
  display: block;
  margin-top: 6px;
  font-size: 1.05rem;
}

.chart-panel {
  padding: 18px;
  margin-bottom: 18px;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 14px;
}

#timeline {
  width: 100%;
  height: 420px;
  display: block;
  border-radius: 16px;
  background: rgba(4, 10, 19, 0.45);
}

.chart-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  font-size: 13px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
}

.summary-grid > div {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  padding: 16px;
}

.table-panel {
  padding: 18px;
  margin-top: 18px;
}

.table-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 16px;
}

.table-header-meta {
  text-align: right;
}

.table-header-meta span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.table-header-meta strong {
  display: block;
  margin-top: 6px;
  font-size: 1rem;
}

.table-wrap {
  overflow: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.history-table th,
.history-table td {
  padding: 14px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.history-table th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.history-table td code {
  background: rgba(255, 255, 255, 0.05);
  padding: 3px 8px;
  border-radius: 999px;
}

.empty-state {
  padding: 18px 8px 4px;
  color: var(--muted);
}

.login-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.login-shell {
  width: min(560px, calc(100vw - 32px));
  padding: 40px 0;
}

.login-card {
  padding: 28px;
}

.login-form {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.login-form label {
  display: grid;
  gap: 8px;
}

.login-form span {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-form input {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(3, 10, 20, 0.5);
  color: var(--text);
  padding: 14px 16px;
  border-radius: 14px;
  outline: none;
}

.login-form input:focus {
  border-color: rgba(125, 196, 255, 0.55);
  box-shadow: 0 0 0 3px rgba(125, 196, 255, 0.12);
}

.form-error {
  color: #ffc1c1;
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.25);
  padding: 12px 14px;
  border-radius: 14px;
}

.chart-tooltip {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 12px 14px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

.tooltip-content {
  display: grid;
  gap: 6px;
}

.tooltip-timestamp {
  font-weight: 600;
  color: var(--accent);
  font-size: 13px;
}

.tooltip-status {
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.tooltip-status.status-up {
  color: var(--up);
}

.tooltip-status.status-down {
  color: var(--down);
}

.tooltip-detail {
  color: var(--muted);
  font-size: 12px;
  max-width: 160px;
  white-space: normal;
}

.tooltip-latency {
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.tooltip-latency.down {
  color: var(--down);
  font-weight: 600;
  font-size: 13px;
}

@media (max-width: 860px) {
  .app-topbar,
  .hero, .controls, .chart-header, .summary-grid {
    grid-template-columns: 1fr;
    display: grid;
  }

  .app-topbar {
    justify-content: start;
  }

  .controls, .chart-header {
    gap: 12px;
  }

  .meta {
    grid-template-columns: 1fr;
    min-width: 0;
  }

  .session-actions {
    justify-content: space-between;
  }
}