:root {
  --fog: #DCE3E6;
  --paper: #F2F5F6;
  --slate: #2B3A42;
  --slate-soft: #5B6B73;
  --sea: #3F8E90;
  --sun: #E9A93A;
  --bg: var(--fog);
  --surface: var(--paper);
  --ink: var(--slate);
  --ink-soft: var(--slate-soft);
  --line: #C3CDD1;
  --accent: var(--sea);
  --mesh-bg: #CFD8DC;
  --mesh-dot: #2B3A42;
  --font: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1F2B31;
    --surface: #26353C;
    --ink: #E4EAEC;
    --ink-soft: #9DADB4;
    --line: #3A4B53;
    --accent: #5FB8BA;
    --mesh-bg: #33454D;
    --mesh-dot: #16201F;
  }
}
*, *::before, *::after { box-sizing: inherit; }
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 3px; }

.top, main, .foot { max-width: 34rem; margin: 0 auto; padding-inline: 1.25rem; }
.top {
  display: flex; align-items: center; justify-content: space-between; gap: .75rem;
  padding-block: 1rem;
}
.brand { margin: 0; font-size: 1.375rem; font-weight: 800; letter-spacing: -0.02em; }
.top-actions { display: flex; gap: .5rem; }

.cast {
  display: inline-flex; align-items: center; gap: .5rem;
  border: 1.5px solid var(--ink); background: transparent;
  padding: .45rem .9rem; border-radius: 999px; font-weight: 600; font-size: .9rem;
}
.cast svg { width: 1.15rem; height: 1.15rem; fill: currentColor; }
.cast:disabled { opacity: .45; cursor: default; }
.cast[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }

.ghost {
  border: 1.5px solid var(--line); background: transparent; border-radius: 999px;
  padding: .45rem .9rem; font-size: .9rem; font-weight: 600; cursor: pointer;
}
.solid {
  border: 0; background: var(--ink); color: var(--bg);
  border-radius: .6rem; padding: .7rem 1rem; font-weight: 600;
}

/* Lưới loa — điểm nhấn duy nhất của trang */
.stage { text-align: center; padding-block: 1rem 1.5rem; }
.grille {
  position: relative; width: min(68vw, 17rem); aspect-ratio: 1; margin: 1rem auto 1.5rem;
}
.mesh {
  position: absolute; inset: 0; border-radius: 50%;
  background-color: var(--mesh-bg);
  background-image: radial-gradient(circle, var(--mesh-dot) 1.6px, transparent 2px);
  background-size: 9px 9px; background-position: center;
  box-shadow: inset 0 -10px 24px rgba(0,0,0,.12), inset 0 8px 16px rgba(255,255,255,.18);
  transition: transform .4s ease;
}
.led {
  position: absolute; left: 50%; bottom: 14%; width: 3.5rem; height: .5rem; translate: -50% 0;
  display: flex; gap: .35rem; justify-content: center;
  background:
    radial-gradient(circle, var(--ink-soft) 45%, transparent 50%) 0 0 / .5rem .5rem repeat-x;
  opacity: .5; transition: opacity .3s;
}
.grille[data-state="playing"] .led,
.grille[data-state="casting"] .led {
  background-image: radial-gradient(circle, #fff 45%, transparent 50%);
  opacity: 1;
}
.ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 2px solid var(--accent); opacity: 0; pointer-events: none;
}
.grille[data-state="playing"] .mesh { animation: breathe 2.4s ease-in-out infinite; }
.grille[data-state="casting"] .ring { animation: ripple 2.7s ease-out infinite; }
.grille[data-state="casting"] .ring:nth-child(2) { animation-delay: .9s; }
.grille[data-state="casting"] .ring:nth-child(3) { animation-delay: 1.8s; }
@keyframes breathe { 50% { transform: scale(1.025); } }
@keyframes ripple {
  0% { transform: scale(1); opacity: .7; }
  100% { transform: scale(1.45); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .grille .mesh, .grille .ring { animation: none !important; }
  .grille[data-state="casting"] .ring:first-child { opacity: .6; transform: scale(1.08); }
}

.where { margin: 0; color: var(--accent); font-weight: 600; font-size: .95rem; }
.title {
  margin: .25rem 0 0; font-size: clamp(1.6rem, 6vw, 2.1rem); line-height: 1.15;
  font-weight: 800; letter-spacing: -0.025em; overflow-wrap: anywhere;
}
.artist { margin: .25rem 0 0; color: var(--ink-soft); }

/* Điều khiển */
.transport { padding-bottom: 1.75rem; border-bottom: 1px solid var(--line); }
.seek { display: grid; grid-template-columns: 3rem 1fr 3rem; align-items: center; gap: .5rem;
  font-variant-numeric: tabular-nums; font-size: .85rem; color: var(--ink-soft); }
.seek span:last-child { text-align: right; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.buttons { display: flex; justify-content: center; align-items: center; gap: 1.25rem; margin: 1rem 0; }
.round {
  width: 3.25rem; height: 3.25rem; border-radius: 50%;
  border: 0; background: transparent; display: grid; place-items: center;
}
.round svg { width: 1.6rem; height: 1.6rem; fill: currentColor; }
.round.big { width: 4.5rem; height: 4.5rem; background: var(--ink); color: var(--bg); }
.round.big svg { width: 2rem; height: 2rem; }
.round:active { transform: scale(.94); }
.i-pause { display: none; }
.playing .i-play { display: none; }
.playing .i-pause { display: block; }
.volume { display: grid; grid-template-columns: auto 1fr; gap: .75rem; align-items: center;
  font-size: .9rem; color: var(--ink-soft); }

/* Danh sách */
.queue { padding-block: 1.5rem 3rem; }
.queue-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.queue h3 { margin: 0; font-size: 1.1rem; font-weight: 700; }
.file-pick { display: inline-block; }
.list { list-style: none; margin: .75rem 0 0; padding: 0; }
.list li {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .5rem;
  border-bottom: 1px solid var(--line);
}
.list li button.pick {
  text-align: left; background: none; border: 0; padding: .75rem 0; min-width: 0;
}
.list .t { display: block; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list .a { display: block; font-size: .85rem; color: var(--ink-soft); }
.list li[aria-current="true"] .t { color: var(--accent); }
.list .remove {
  background: none; border: 0; color: var(--ink-soft); width: 2.5rem; height: 2.5rem;
  border-radius: 50%; font-size: 1.25rem; line-height: 1;
}
.list .remove:hover { color: var(--ink); }
.list .badge { font-size: .75rem; color: var(--ink-soft); }
.empty { color: var(--ink-soft); padding: 1rem 0; }

.add { margin-top: 2rem; background: var(--surface); padding: 1.25rem; border-radius: 1rem;
  display: grid; gap: .75rem; }
.add .hint { margin: 0; font-size: .875rem; color: var(--ink-soft); max-width: 60ch; }
.add input {
  width: 100%; padding: .65rem .75rem; border: 1.5px solid var(--line);
  border-radius: .6rem; background: var(--bg);
}
.add .row { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }

.foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .5rem .75rem;
  padding-block: 2rem calc(1.5rem + env(safe-area-inset-bottom, 0px));
  font-size: .8rem; color: var(--ink-soft); font-variant-numeric: tabular-nums;
}
.foot .ghost { padding: .3rem .8rem; font-size: .8rem; color: var(--accent); border-color: var(--accent); }

.toast {
  position: fixed; left: 50%; bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
  translate: -50% 0; max-width: calc(100% - 2.5rem);
  background: var(--ink); color: var(--bg); padding: .7rem 1rem; border-radius: .7rem;
  font-size: .9rem; box-shadow: 0 6px 24px rgba(0,0,0,.25);
}