:root {
  --bg: #05060a;
  --bg-elevated: #11131a;
  --accent: #0a84ff;
  --accent-soft: rgba(10, 132, 255, 0.15);
  --accent-strong: rgba(10, 132, 255, 0.35);
  --border-subtle: #2a2d3a;
  --text: #f5f5f7;
  --text-muted: #a1a1aa;
  --danger: #ff453a;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.55);
  --transition-fast: 160ms ease-out;
  --transition-med: 220ms ease-out;
  --focus-ring: 0 0 0 2px rgba(10, 132, 255, 0.9);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: auto;
  min-height: 100%;
  overflow-y: auto;
  background: radial-gradient(circle at top, #151827 0, #05060a 55%);
  color: var(--text);
  font-family: var(--font-sans);
}

body {
  display: block;
}

/* Shared app shell */
.app-shell {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 18px 80px;
  box-sizing: border-box;
  background: linear-gradient(145deg, #0a0b10, #10121a);
  border-radius: 32px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 4px 16px;
}

.app-title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.app-title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-pill {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-strong);
}

.app-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.app-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.app-nav a {
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.02);
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), opacity var(--transition-fast);
}

.app-nav a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.app-nav a.app-nav-active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* Content panel */
.page-panel {
  background: radial-gradient(circle at top left, #181b27 0, #0b0c12 55%);
  border-radius: 24px;
  padding: 18px 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: 8px;
}

.page-panel-header {
  margin-bottom: 12px;
}

.page-panel-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #e5e5f0;
}

.page-panel-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Text content */
.page-content {
  margin-top: 12px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
}

.page-content h2 {
  font-size: 1rem;
  margin-top: 18px;
  margin-bottom: 6px;
}

.page-content h3 {
  font-size: 0.95rem;
  margin-top: 14px;
  margin-bottom: 4px;
}

.page-content p {
  margin: 4px 0 10px;
  color: var(--text-muted);
}

.page-content ul {
  margin: 6px 0 10px 18px;
  padding: 0;
}

.page-content li {
  margin-bottom: 4px;
}

/* Footer */
.app-footer {
  width: 100%;
  padding: 32px 0 40px;
  margin-top: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  background: transparent;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s ease-out;
}

.footer-links a:hover {
  opacity: 0.7;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .app-shell {
    border-radius: 0;
    max-width: 100%;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .app-nav {
    justify-content: flex-start;
  }
}