/* ==========================================================================
   Reset & base layout
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  background: var(--color-bg);
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

/* ---- App shell ---- */

#app {
  min-height: 100dvh;
  display: flex;
}

.app-sidenav {
  display: none;
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--nav-width);
  flex-direction: column;
  padding: var(--space-5) var(--space-4);
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  z-index: var(--z-nav);
}

.app-main {
  flex: 1;
  min-width: 0;
  min-height: 100dvh;
}

.app-content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) calc(var(--nav-height) + var(--space-8));
}

.app-topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: calc(env(safe-area-inset-top) + var(--space-4)) var(--space-4) var(--space-4);
  background: rgba(5, 5, 5, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
}

.app-topbar.is-scrolled {
  border-bottom-color: var(--color-border);
}

.app-bottomnav {
  position: fixed;
  inset: auto 0 0 0;
  z-index: var(--z-nav);
  display: flex;
  justify-content: space-around;
  padding: var(--space-2) var(--space-2) calc(env(safe-area-inset-bottom) + var(--space-2));
  background: rgba(16, 16, 16, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid var(--color-border);
}

/* ---- Grid helpers ---- */

.stack {
  display: flex;
  flex-direction: column;
}

.row {
  display: flex;
  align-items: center;
}

.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 480px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.spacer {
  flex: 1;
}

/* ---- Breakpoints ---- */

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .app-sidenav {
    display: flex;
  }

  .app-main {
    margin-left: var(--nav-width);
  }

  .app-bottomnav {
    display: none;
  }

  .app-topbar {
    padding: var(--space-6) var(--space-8) var(--space-5);
  }

  .app-content {
    padding: 0 var(--space-8) var(--space-9);
  }

  .grid-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .app-content {
    padding-left: var(--space-9);
    padding-right: var(--space-9);
  }
}