:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --panel-muted: #f9fafb;
  --text: #1b2430;
  --text-muted: #5f6977;
  --accent: #0b6fa4;
  --accent-soft: #d7ecf7;
  --success: #1f7a3f;
  --warn: #996300;
  --danger: #b02a37;
  --border: #d7dce3;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(25, 37, 52, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #eaf4fb 0%, var(--bg) 55%);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, #094468, #0b6fa4);
  color: #f5fbff;
  box-shadow: var(--shadow);
}

.app-header h1 {
  margin: 0.2rem 0 0;
  font-size: 1.5rem;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  opacity: 0.9;
}

.header-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.header-controls select {
  border: 1px solid #84b6d5;
  border-radius: 8px;
  padding: 0.35rem 0.5rem;
}

.shell-body {
  display: grid;
  grid-template-columns: 230px 1fr;
  min-height: 0;
}

.side-nav {
  background: #0f1d2d;
  padding: 1rem;
  display: grid;
  gap: 0.5rem;
  align-content: start;
}

.nav-item {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 10px;
  text-align: left;
  padding: 0.65rem 0.75rem;
  color: #e8eff7;
  background: transparent;
  cursor: pointer;
  font-size: 0.95rem;
}

.nav-item[aria-current="page"] {
  background: #17344d;
  border-color: #2f6089;
}

.nav-item:hover {
  background: #152d44;
}

.action-button {
  appearance: none;
  border: 1px solid #2f6089;
  background: #17344d;
  color: #e8eff7;
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

.action-button:hover {
  background: #1b3b57;
}

.nav-item:focus-visible,
button:focus-visible,
select:focus-visible {
  outline: 3px solid #ffbf47;
  outline-offset: 2px;
}

#dashboard-main {
  padding: 1rem;
  overflow: auto;
}

.hidden {
  display: none;
}

.widget-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.widget {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.9rem;
  min-height: 152px;
}

.widget-wide {
  grid-column: span 2;
}

.widget h2 {
  margin: 0;
  font-size: 1rem;
}

.widget .subtle {
  margin-top: 0.35rem;
  color: var(--text-muted);
}

.metric {
  font-size: 1.9rem;
  margin-top: 0.75rem;
}

.trend-up {
  color: var(--success);
}

.trend-down {
  color: var(--danger);
}

.state {
  margin-top: 1rem;
  padding: 0.6rem;
  border-radius: 8px;
  background: var(--panel-muted);
}

.state.loading {
  border: 1px dashed var(--accent);
  color: var(--accent);
}

.state.empty {
  border: 1px dashed #8a94a3;
  color: var(--text-muted);
}

.state.error {
  border: 1px solid #f0b8bf;
  background: #fff2f4;
  color: var(--danger);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
}

th,
td {
  border-bottom: 1px solid var(--border);
  text-align: left;
  padding: 0.45rem;
}

@media (max-width: 980px) {
  .shell-body {
    grid-template-columns: 1fr;
  }

  .side-nav {
    grid-auto-flow: column;
    grid-auto-columns: minmax(110px, 1fr);
    overflow-x: auto;
  }

  .widget-grid {
    grid-template-columns: 1fr;
  }

  .widget-wide {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
    align-items: start;
    gap: 0.8rem;
  }
}