:root {
  --app-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --app-background: linear-gradient(180deg, #021b0f 0%, #010a06 100%);
  --app-surface: #042414;
  --app-card: #08321d;
  --app-text: #e6edf3;
  --app-heading: #f8fafc;
  --app-muted: #8fc4a5;
  --app-border: rgba(148, 163, 184, 0.14);
  --app-primary: #009b3a;
  --app-primary-strong: #00712c;
  --app-primary-soft: rgba(0, 155, 58, 0.18);
  --app-success: #22c55e;
  --app-danger: #ef4444;
  --app-radius-sm: 8px;
  --app-radius-md: 12px;
  --app-radius-lg: 20px;
  --app-spacing-xs: 4px;
  --app-spacing-sm: 8px;
  --app-spacing-md: 16px;
  --app-spacing-lg: 24px;
  --app-spacing-xl: 32px;
  --app-spacing-2xl: 48px;
  --app-footer-height: 72px;
  --app-shell-padding: clamp(16px, 4vw, 32px);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--app-font-family);
  line-height: 1.5;
  color: var(--app-text);
  background: var(--app-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: calc(var(--app-footer-height) + var(--app-spacing-lg) + env(safe-area-inset-bottom, 0px));
}

body.light-surface {
  background: var(--app-surface);
}

main {
  flex: 1;
  display: block;
}

.app-shell {
  flex: 1;
  width: min(1080px, 100%);
  margin: 0 auto;
  padding: var(--app-shell-padding);
  padding-bottom: calc(var(--app-shell-padding) + var(--app-footer-height));
}

.app-shell header,
.app-shell section,
.app-shell article {
  width: 100%;
}

.surface-card {
  background: var(--app-card);
  border-radius: var(--app-radius-lg);
  border: 1px solid var(--app-border);
  box-shadow: 0 16px 32px rgba(8, 15, 32, 0.35);
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 10000;
}

.skip-link:focus {
  left: var(--app-spacing-md);
  top: var(--app-spacing-md);
  width: auto;
  height: auto;
  padding: var(--app-spacing-sm) var(--app-spacing-md);
  background: #ffffff;
  color: #0b1220;
  border-radius: var(--app-radius-sm);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.35);
}

button,
input,
select,
textarea {
  font-family: inherit;
}

button {
  cursor: pointer;
}

.footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 15, 28, 0.9);
  backdrop-filter: saturate(160%) blur(18px);
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  padding: var(--app-spacing-sm) var(--app-spacing-lg);
  padding-bottom: calc(var(--app-spacing-sm) + env(safe-area-inset-bottom, 0px));
  z-index: 1200;
}

.footer-nav {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--app-spacing-sm);
}

.footer-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--app-spacing-xs);
  color: var(--app-muted);
  padding: var(--app-spacing-sm);
  border-radius: var(--app-radius-md);
  min-height: 48px;
  transition: transform 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.footer-nav a .icon {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  fill: currentColor;
  transition: transform 0.2s ease;
}

.icon-nav {
  width: 22px;
  height: 22px;
}

.footer-nav a span {
  font-size: 0.75rem;
  color: inherit;
}

.footer-nav a.active span, .footer-nav [aria-current="page"] span {
  font-weight: 600;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--app-heading);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-1px);
}

.footer-nav a.active,
.footer-nav [aria-current="page"] {
  color: var(--app-primary);
  background: var(--app-primary-soft);
  box-shadow: inset 0 0 0 1px rgba(0, 155, 58, 0.35);
}

.footer-nav a.active i,
.footer-nav [aria-current="page"] i {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 1100;
  backdrop-filter: saturate(140%) blur(16px);
  background: rgba(10, 15, 28, 0.85);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  padding: var(--app-spacing-sm) var(--app-spacing-lg);
  margin-bottom: var(--app-spacing-md);
}

.topbar h1,
.topbar h2 {
  margin: 0;
  color: var(--app-heading);
  font-size: 1.2rem;
  font-weight: 600;
}

.outline-card {
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  background: rgba(17, 24, 39, 0.55);
  backdrop-filter: blur(12px);
}

.text-muted {
  color: var(--app-muted);
}

:focus-visible {
  outline: 2px solid var(--app-primary);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  body {
    padding-bottom: calc(var(--app-footer-height) + var(--app-spacing-md) + env(safe-area-inset-bottom, 0px));
  }

  .footer-nav {
    gap: var(--app-spacing-xs);
  }

  .footer-nav a {
    font-size: 0.7rem;
    min-width: 54px;
    padding: var(--app-spacing-xs);
  }

  .footer-nav a .icon {
    width: 18px;
    height: 18px;
  }

  .icon-nav {
    width: 20px;
    height: 20px;
  }

  .app-shell {
    padding: var(--app-spacing-lg) var(--app-spacing-md);
    padding-bottom: calc(var(--app-spacing-lg) + var(--app-footer-height));
  }
}

@media (max-width: 480px) {
  .footer-nav a {
    font-size: 0.65rem;
    min-width: 48px;
  }

  .footer-nav a .icon {
    width: 16px;
    height: 16px;
  }

  .icon-nav {
    width: 18px;
    height: 18px;
  }

  .app-shell {
    padding: var(--app-spacing-lg) var(--app-spacing-sm);
  }
}

/* Native alert toast */
.native-alert-toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--app-footer-height) + var(--app-spacing-xl));
  transform: translate(-50%, 20px);
  min-width: min(320px, 90vw);
  max-width: 90vw;
  padding: var(--app-spacing-md);
  border-radius: 999px;
  background: rgba(2, 27, 15, 0.92);
  color: var(--app-heading);
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 2147483000;
}

.native-alert-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 480px) {
  .native-alert-toast {
    font-size: 0.85rem;
    padding: var(--app-spacing-sm) var(--app-spacing-md);
    bottom: calc(var(--app-footer-height) + var(--app-spacing-lg));
  }
}

/* Offline status indicator */
.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: #b91c1c;
  color: #fff;
  text-align: center;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  z-index: 2147483647;
  transform: translateY(-110%);
  transition: transform 0.3s ease-in-out;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.25);
}

.offline-banner__message {
  display: inline-block;
}

.offline-banner.is-active {
  transform: translateY(0);
}