/* ============================================================
   KikoMix · Layout
   Responsive app shell: content column, M3 navigation that
   transforms with the viewport, responsive content grids,
   touch targets, and clearance for the nav + persistent player.
   Vanilla CSS, mobile-first. Loads after tokens/base/components/
   features so it is the canonical word on shell geometry.
   ============================================================ */

:root {
  --nav-bar-h: 64px;    /* bottom nav height (<600px), content area */
  --nav-rail-w: 80px;   /* navigation rail width (>=600px) */
  --mini-h: 64px;       /* mini-player height (<1024px) */
  --fullbar-h: 96px;    /* full player bar height (>=1024px): fits the
                           transport row + slim seek row with room to
                           vertically center the side clusters */
  --content-max: 720px;    /* mobile content column */
  --content-max-md: 960px; /* tablet / small laptop */
  --content-max-lg: 1240px;/* desktop */
  --sat: env(safe-area-inset-top, 0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left, 0px);
  --sar: env(safe-area-inset-right, 0px);
}

/* ---------- Content column ---------- */
#main {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-4);
  padding-top: calc(var(--sat) + var(--space-4));
  /* Clear the fixed bottom nav. */
  padding-bottom: calc(var(--nav-bar-h) + var(--sab) + var(--space-6));
  min-height: 100dvh;
}

/* When the persistent player is showing, clear it too (per breakpoint height). */
body.has-player #main {
  padding-bottom: calc(var(--nav-bar-h) + var(--sab) + var(--mini-h) + var(--space-4));
}

@media (min-width: 600px) {
  #main {
    max-width: var(--content-max-md);
    margin-left: var(--nav-rail-w);
    margin-right: auto;
    padding: var(--space-6);
    padding-top: calc(var(--sat) + var(--space-6));
    padding-bottom: var(--space-10);
  }
  body.has-player #main {
    padding-bottom: calc(var(--mini-h) + var(--sab) + var(--space-6));
  }
}

@media (min-width: 1024px) {
  #main {
    max-width: min(var(--content-max-lg), calc(100% - var(--nav-rail-w)));
    padding: var(--space-8);
    padding-top: calc(var(--sat) + var(--space-8));
    padding-bottom: var(--space-10);
  }
  body.has-player #main {
    padding-bottom: calc(var(--fullbar-h) + var(--sab) + var(--space-6));
  }
}

/* ---------- App header clears the rail ----------
   The header is centered on the full viewport by components.css; at
   >=600px that would slide the logo under the rail, so it gets the
   same left offset and column rhythm as #main. */
@media (min-width: 600px) {
  .app-header {
    margin-left: var(--nav-rail-w);
    margin-right: auto;
    max-width: var(--content-max-md);
    padding-inline: var(--space-6);
  }
}
@media (min-width: 1024px) {
  .app-header {
    max-width: min(var(--content-max-lg), calc(100% - var(--nav-rail-w)));
    padding-inline: var(--space-8);
  }
}

/* ---------- Sections ---------- */
section.tab { display: none; width: 100%; }
section.tab.active { display: block; }

/* ---------- Responsive content grids ----------
   Opt-in grid for card content; mix cards get a real grid with the
   section heading + new-mix form spanning full width. */
.km-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}
@media (min-width: 600px) {
  .km-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

#mixes-root {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
#mixes-root > h3,
#mixes-root > .mix-new,
#mixes-root > .empty-state {
  grid-column: 1 / -1;
}
@media (min-width: 600px) {
  #mixes-root { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

/* ---------- Touch targets (>=48px) ---------- */
#tabbar > button,
.player .icon-btn,
#player-expand,
.queue__close,
.queue__item,
.track-row .btn,
.chip {
  min-height: 48px;
}
.track-row { min-height: 56px; }

/* ============================================================
   Navigation — ONE element, CSS-driven transformation
   <600px: M3 bottom navigation bar (fixed, full width)
   600px+: M3 navigation rail (fixed left, 80px wide)
   ============================================================ */
#tabbar {
  position: fixed;
  z-index: 50;
  display: flex;
  background: rgba(12, 14, 22, .94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

/* --- Mobile: bottom navigation bar --- */
@media (max-width: 599px) {
  #tabbar {
    left: 0; right: 0; bottom: 0;
    flex-direction: row;
    align-items: stretch;
    border-top: 1px solid var(--line);
    padding-bottom: var(--sab);
    padding-left: var(--sal);
    padding-right: var(--sar);
  }
  #tabbar > button {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    min-height: var(--nav-bar-h);
    padding: var(--space-2) var(--space-1);
    color: var(--muted);
    font-size: var(--fs-tiny);
    border-radius: var(--radius-sm);
  }
}

/* --- Tablet + desktop: navigation rail --- */
@media (min-width: 600px) {
  #tabbar {
    top: 0; left: 0; bottom: 0; right: auto;
    width: var(--nav-rail-w);
    max-width: none;
    margin: 0;
    flex-direction: column;
    align-items: stretch;
    border-right: 1px solid var(--line);
    padding-top: calc(var(--sat) + var(--space-3));
    padding-bottom: calc(var(--sab) + var(--space-3));
    padding-left: var(--sal);
    gap: var(--space-1);
  }
  #tabbar > button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 100%;
    min-height: 64px;
    padding: var(--space-2) var(--space-1);
    color: var(--muted);
    font-size: var(--fs-tiny);
    border-radius: var(--radius);
  }
}

/* --- Shared nav button states --- */
#tabbar > button svg {
  width: 24px; height: 24px;
  flex-shrink: 0;
}
#tabbar > button > span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
#tabbar > button:hover { color: var(--text); background: rgba(255, 255, 255, .05); }
#tabbar > button.active {
  color: var(--gold-soft);
  background: rgba(242, 185, 13, .10);
}
#tabbar > button.active svg { animation: beamPulse 2.4s ease-in-out infinite; }

/* ---------- Toast clears nav + player ----------
   At >=600px the toast stays inside the content area (clear of the
   rail) whether or not the player bar is showing. */
body.has-player #toast {
  bottom: calc(var(--nav-bar-h) + var(--sab) + var(--mini-h) + var(--space-4));
}
@media (min-width: 600px) {
  #toast { left: calc(50% + var(--nav-rail-w) / 2); }
  body.has-player #toast {
    bottom: calc(var(--mini-h) + var(--sab) + var(--space-4));
  }
}
@media (min-width: 1024px) {
  body.has-player #toast {
    bottom: calc(var(--fullbar-h) + var(--sab) + var(--space-4));
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  #tabbar > button.active svg { animation: none; }
}

/* ---------- Narrow phones (<=400px): let row actions wrap ----------
   Search/mix/source rows carry several actions; wrapping keeps titles
   readable instead of crushing .track-meta to zero width. */
@media (max-width: 400px) {
  .track-row { flex-wrap: wrap; row-gap: var(--space-2); }
  .track-row .cover { width: 48px; height: 48px; }
  .track-meta { flex: 1 1 60%; min-width: 0; }
  .track-actions { flex-wrap: wrap; row-gap: var(--space-2); }
  .track-actions .btn { padding-inline: var(--space-3); font-size: var(--fs-tiny); }
}

/* ---------- LionDavid contextual tip: docked above nav/player ----------
   #lion-tip is a single element reused across tabs; fix it above the
   navigation (and the player bar when one is active) instead of in-flow. */
#lion-tip.tip-bar {
  position: fixed;
  left: var(--space-4);
  right: var(--space-4);
  bottom: calc(var(--nav-bar-h, 64px) + var(--sab) + var(--space-3));
  z-index: 90;
  margin-bottom: 0;
}
body.has-player #lion-tip.tip-bar {
  bottom: calc(var(--nav-bar-h, 64px) + var(--mini-h, 64px) + var(--sab) + var(--space-3));
}
@media (min-width: 600px) {
  #lion-tip.tip-bar { left: calc(var(--nav-rail-w, 80px) + var(--space-4)); }
  body.has-player #lion-tip.tip-bar {
    bottom: calc(var(--mini-h, 64px) + var(--sab) + var(--space-3));
  }
}
@media (min-width: 1024px) {
  body.has-player #lion-tip.tip-bar {
    bottom: calc(var(--fullbar-h, 88px) + var(--sab) + var(--space-3));
  }
}