/* Shared UI components (web/js/ui). Everything uses the tokens in tokens.css. */

/* ---- Scrollbars: thin, subtle, brighter on hover (like the Spotify app) ---- */
* { scrollbar-width: thin; scrollbar-color: rgba(255, 255, 255, .25) transparent; }
:root[data-theme="light"] * { scrollbar-color: rgba(0, 0, 0, .3) transparent; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .25); border: 3px solid transparent; background-clip: content-box; border-radius: var(--r-pill); }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, .5); background-clip: content-box; }

/* ---- Buttons ---- */
.ui-btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2); min-height: 32px; padding: 8px 32px; border: 1px solid transparent; border-radius: var(--r-pill); font: var(--fw-bold) var(--fs-sm)/1 var(--font); cursor: pointer; transition: transform var(--t-press) var(--ease), background var(--t-fast), border-color var(--t-fast); }
.ui-btn:hover { transform: scale(1.04); }
.ui-btn:active { transform: scale(.97); }
.ui-btn-primary { background: var(--accent); color: var(--accent-ink); }
.ui-btn-primary:hover { background: var(--accent-hover); }
.ui-btn-ghost { background: transparent; color: var(--text); border-color: #727272; }
.ui-btn-ghost:hover { border-color: var(--text); }
.ui-btn-text { background: transparent; color: var(--muted); padding: 8px 16px; }
.ui-btn-text:hover { color: var(--text); }
.ui-btn[disabled] { opacity: .5; pointer-events: none; }

.ui-iconbtn { display: inline-grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 0; border-radius: 50%; background: transparent; color: var(--muted); cursor: pointer; transition: color var(--t-fast), transform var(--t-press) var(--ease), background var(--t-fast); }
.ui-iconbtn:hover { color: var(--text); transform: scale(1.06); }
.ui-iconbtn:active { transform: scale(.94); }
.ui-iconbtn.on { color: var(--accent); }

.ui-playbtn { display: inline-grid; place-items: center; padding: 0; border: 0; border-radius: 50%; background: var(--accent); color: var(--accent-ink); cursor: pointer; box-shadow: var(--shadow-play); transition: transform var(--t-press) var(--ease), background var(--t-fast); }
.ui-playbtn:hover { transform: scale(1.06); background: var(--accent-hover); }
.ui-playbtn:active { transform: scale(.96); }

.ui-chip { padding: 6px 12px; border: 0; border-radius: var(--r-pill); background: var(--raised); color: var(--text); font: var(--fw-medium) var(--fs-sm)/1.4 var(--font); cursor: pointer; transition: background var(--t-fast), color var(--t-fast); }
.ui-chip:hover { background: var(--hover); }
.ui-chip.selected { background: var(--text); color: var(--bg); }

/* ---- Sliders (seek and volume): thin, white fill, green on hover, round handle appears on hover ---- */
.ui-slider { -webkit-appearance: none; appearance: none; flex: 1; height: 12px; margin: 0; background: transparent; cursor: pointer; --pct: 0%; --fill: var(--text); }
.ui-slider:hover { --fill: var(--accent); }
.ui-slider[disabled] { opacity: .4; pointer-events: none; }
.ui-slider::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: linear-gradient(to right, var(--fill) var(--pct), var(--track) var(--pct)); }
.ui-slider::-moz-range-track { height: 4px; border-radius: 2px; background: var(--track); }
.ui-slider::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--fill); }
.ui-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 12px; height: 12px; margin-top: -4px; border: 0; border-radius: 50%; background: var(--text); opacity: 0; }
.ui-slider::-moz-range-thumb { width: 12px; height: 12px; border: 0; border-radius: 50%; background: var(--text); opacity: 0; }
.ui-slider:hover::-webkit-slider-thumb, .ui-slider:active::-webkit-slider-thumb, .ui-slider:focus-visible::-webkit-slider-thumb { opacity: 1; }
.ui-slider:hover::-moz-range-thumb, .ui-slider:active::-moz-range-thumb, .ui-slider:focus-visible::-moz-range-thumb { opacity: 1; }

/* ---- Artwork ---- */
.ui-img { position: relative; display: grid; place-items: center; overflow: hidden; width: 100%; aspect-ratio: 1; border-radius: var(--r-art); background: var(--raised); color: var(--faint); }
.ui-img.round { border-radius: 50%; }
.ui-img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity var(--t-fast) ease; }
.ui-img[data-state="loaded"] img { opacity: 1; }

/* ---- Skeletons ---- */
.ui-skel { display: block; background: linear-gradient(100deg, var(--raised) 30%, var(--hover) 50%, var(--raised) 70%); background-size: 300% 100%; animation: ui-shimmer 1.4s linear infinite; }
.ui-skel-art { height: auto !important; aspect-ratio: 1; }
@keyframes ui-shimmer { from { background-position: 100% 0; } to { background-position: 0 0; } }
.ui-skel-rows { display: grid; gap: var(--sp-2); }
.ui-skel-row { display: flex; align-items: center; gap: var(--sp-3); padding: 6px 8px; }
.ui-skel-col { display: grid; gap: 6px; flex: 1; }
.ui-skel-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--sp-4); }
.ui-skel-card { display: grid; gap: var(--sp-2); padding: var(--sp-3); }

/* ---- Equaliser ---- */
.ui-eq { display: inline-flex; align-items: flex-end; justify-content: center; gap: 2px; width: 14px; height: 14px; }
.ui-eq i { width: 3px; height: 100%; background: var(--accent); border-radius: 1px; transform-origin: bottom; animation: ui-eq 1s ease-in-out infinite; }
.ui-eq i:nth-child(1) { animation-duration: .9s; }
.ui-eq i:nth-child(2) { animation-duration: 1.2s; animation-delay: -.4s; }
.ui-eq i:nth-child(3) { animation-duration: .7s; animation-delay: -.2s; }
.ui-eq i:nth-child(4) { animation-duration: 1.05s; animation-delay: -.6s; }
.ui-eq[data-paused="true"] i { animation-play-state: paused; transform: scaleY(.25); }
@keyframes ui-eq { 0%, 100% { transform: scaleY(.2); } 50% { transform: scaleY(1); } }

/* ---- Cards and shelves ---- */
.ui-card { display: block; padding: var(--sp-3); border-radius: var(--r-art); background: transparent; transition: background var(--t-fast) ease; min-width: 0; }
/* Keep navigation and playback as separate tab stops, with the link covering the card. */
.ui-linked { position: relative; isolation: isolate; }
.ui-surface-link { position: absolute; inset: 0; border-radius: inherit; z-index: var(--z-link); }
.ui-linked .ui-playbtn { z-index: var(--z-control); }
.ui-card:hover { background: var(--raised); text-decoration: none; }
.ui-card-art { position: relative; margin-bottom: var(--sp-3); }
.ui-card-art .ui-img { box-shadow: 0 8px 24px rgba(0, 0, 0, .5); }
.ui-card-play { position: absolute; right: 8px; bottom: 8px; opacity: 0; transform: translateY(8px); transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease), background var(--t-fast); }
.ui-card:hover .ui-card-play, .ui-card:focus-within .ui-card-play { opacity: 1; transform: translateY(0); }
.ui-card-play:hover { transform: translateY(0) scale(1.06); }
.ui-card-title { font-weight: var(--fw-bold); font-size: var(--fs-md); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ui-card-sub { margin-top: 2px; color: var(--muted); font-size: var(--fs-sm); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.ui-shelf { margin: 0 0 var(--sp-5); }
.ui-shelf-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: var(--sp-1); }
.ui-shelf-head h2 { margin: 0; font-size: var(--fs-lg); font-weight: var(--fw-bold); }
.ui-shelf-head h2 a:hover { text-decoration: underline; }
.ui-shelf-all { color: var(--muted); font-size: var(--fs-sm); font-weight: var(--fw-bold); }
.ui-shelf-all:hover { color: var(--text); }
.ui-shelf-wrap { position: relative; }
.ui-shelf-row { display: grid; grid-auto-flow: column; grid-auto-columns: 184px; gap: var(--sp-1); overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: none; margin: 0 calc(var(--sp-3) * -1); padding: 0 var(--sp-3); }
.ui-shelf-row::-webkit-scrollbar { display: none; }
.ui-shelf-row > * { scroll-snap-align: start; }
.ui-shelf-arrow { position: absolute; top: 80px; z-index: 2; display: grid; place-items: center; width: 40px; height: 40px; border: 0; border-radius: 50%; background: rgba(24, 24, 24, .9); color: var(--text); box-shadow: 0 4px 12px rgba(0, 0, 0, .5); cursor: pointer; opacity: 0; transition: opacity var(--t-fast), transform var(--t-press) var(--ease); }
.ui-shelf-arrow.left { left: -8px; }
.ui-shelf-arrow.right { right: -8px; }
.ui-shelf-wrap:hover .ui-shelf-arrow, .ui-shelf-arrow:focus-visible { opacity: 1; }
.ui-shelf-arrow:hover { transform: scale(1.08); }

.ui-scroller { overflow-y: auto; min-height: 0; }

/* ---- Tooltip ---- */
.ui-tooltip { position: fixed; z-index: var(--z-tooltip); max-width: 260px; padding: 4px 8px; border-radius: 4px; background: #282828; color: #fff; font: var(--fw-medium) var(--fs-xs)/1.4 var(--font); box-shadow: 0 4px 12px rgba(0, 0, 0, .5); pointer-events: none; opacity: 0; transition: opacity 120ms ease; }
.ui-tooltip.show { opacity: 1; }

/* ---- Context menu ---- */
.ui-menu { position: fixed; z-index: var(--z-menu); min-width: 220px; max-width: 320px; padding: 4px; border-radius: var(--r-menu); background: #282828; color: #fff; box-shadow: var(--shadow-menu); outline: 0; opacity: 0; transform: scale(.98); transform-origin: top left; }
.ui-menu.ready { opacity: 1; transform: none; transition: opacity 100ms ease, transform 100ms var(--ease); }
.ui-menu:focus, .ui-menu:focus-visible { outline: 0; }
.ui-menu .ui-menu { position: fixed; }
.ui-menu-item { display: flex; align-items: center; gap: var(--sp-3); width: 100%; padding: 10px 12px; border: 0; border-radius: 2px; background: transparent; color: inherit; font: var(--fw-regular) var(--fs-sm)/1.2 var(--font); text-align: left; cursor: default; }
.ui-menu-item.active, .ui-menu-item:hover { background: rgba(255, 255, 255, .1); }
.ui-menu-item.danger { color: var(--danger); }
.ui-menu-item.disabled { opacity: .4; pointer-events: none; }
.ui-menu-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ui-menu-gap { width: 16px; }
.ui-menu-sep { height: 1px; margin: 4px 0; background: rgba(255, 255, 255, .1); }

/* ---- Toast ---- */
.ui-toasts { position: fixed; left: 50%; bottom: 104px; z-index: var(--z-toast); display: grid; gap: var(--sp-2); transform: translateX(-50%); pointer-events: none; }
.ui-toast { display: flex; align-items: center; gap: var(--sp-4); max-width: min(560px, 92vw); padding: 12px 20px; border-radius: var(--r-pill); background: var(--info); color: #fff; font: var(--fw-bold) var(--fs-sm)/1.3 var(--font); box-shadow: 0 8px 24px rgba(0, 0, 0, .4); pointer-events: auto; animation: ui-toast-in var(--t-panel) var(--ease); }
.ui-toast.error { background: var(--danger); }
.ui-toast-action { padding: 0; border: 0; background: none; color: inherit; font: inherit; text-decoration: underline; cursor: pointer; }
@keyframes ui-toast-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* ---- Dialog ---- */
.ui-dialog { padding: 0; border: 0; border-radius: 12px; background: #282828; color: #fff; box-shadow: var(--shadow-menu); }
.ui-dialog[open] { animation: ui-dialog-in var(--t-fast) var(--ease); }
.ui-dialog::backdrop { background: rgba(0, 0, 0, .7); animation: ui-fade var(--t-fast) ease; }
.ui-dialog-body { padding: var(--sp-5); }
.ui-dialog-title { margin: 0 0 var(--sp-4); font-size: var(--fs-lg); font-weight: var(--fw-bold); }
.ui-dialog-actions { display: flex; gap: var(--sp-3); justify-content: flex-end; margin-top: var(--sp-5); }
@keyframes ui-dialog-in { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }
@keyframes ui-fade { from { opacity: 0; } to { opacity: 1; } }

/* ---- Small touches ---- */
.ui-iconbtn.pop svg { animation: ui-pop 450ms var(--ease); }
@keyframes ui-pop { 0% { transform: scale(.6); } 45% { transform: scale(1.3); } 100% { transform: scale(1); } }
.ui-iconbtn svg { transition: transform var(--t-fast) var(--ease); }
.ui-iconbtn.on { transition: color var(--t-fast), transform var(--t-press) var(--ease); }

/* ---- Motion preferences ---- */
@media (prefers-reduced-motion: reduce) {
  .ui-skel, .ui-eq i, .ui-toast, .ui-dialog[open], .ui-dialog::backdrop, .ui-iconbtn.pop svg { animation: none; }
  .ui-card-play { transform: none; }
}