:root {
  --bg: #14111d;
  --bg-soft: #1b1726;
  --panel: #221d31;
  --panel-2: #2a2440;
  --line: #362f4c;
  --text: #f1edff;
  --muted: #a79fc4;
  --muted-2: #7e7799;
  --accent: #8b6cff;
  --accent-2: #ff7a9c;
  --accent-3: #ffd166;
  --ok: #5ee0a0;
  --err: #ff7a7a;
  --grad: linear-gradient(120deg, #8b6cff 0%, #ff7a9c 100%);
  --radius: 18px;
  --shadow: 0 18px 50px -22px rgba(0,0,0,.7);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }   /* keep the hidden attr authoritative over display rules */
html, body { margin: 0; }
body {
  font-family: "Inter", system-ui, sans-serif;
  background:
    radial-gradient(1100px 600px at 12% -8%, rgba(139,108,255,.20), transparent 60%),
    radial-gradient(900px 520px at 95% 0%, rgba(255,122,156,.16), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  padding: 0 clamp(14px, 4vw, 48px) 64px;
}

h1, h2, .panel-title, .brand-mark { font-family: "Bricolage Grotesque", "Inter", sans-serif; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  padding: 26px 4px 18px;
  max-width: 1180px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 16px; }
.brand-mark {
  font-size: 40px; line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 4px 14px rgba(139,108,255,.5));
  animation: spin 14s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.topbar h1 { font-size: clamp(28px, 4vw, 40px); margin: 0; letter-spacing: -.02em; font-weight: 800; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: 15px; max-width: 46ch; }
.engine-pill {
  font-size: 12.5px; color: var(--muted); background: var(--bg-soft);
  border: 1px solid var(--line); padding: 7px 13px; border-radius: 999px; white-space: nowrap;
}

/* ---------- how it works ---------- */
.howto {
  max-width: 1180px; margin: 8px auto 26px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.step {
  display: flex; gap: 13px; align-items: flex-start;
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent), var(--bg-soft);
  border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px;
}
.step-no {
  flex: none; width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center; font-weight: 700; color: #1a1326;
  background: var(--grad); font-family: "Bricolage Grotesque";
}
.step strong { font-size: 15px; }
.step p { margin: 2px 0 0; color: var(--muted); font-size: 13.5px; }

/* ---------- layout ---------- */
.layout {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 22px;
  align-items: start;
}
.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 24px 26px; box-shadow: var(--shadow);
}
/* Each pane sticks and scrolls on its own, so a long library never forces you
   to scroll the whole page before the form moves. */
.studio { position: sticky; top: 18px; }
.library {
  position: sticky; top: 18px;
  max-height: calc(100vh - 36px);
  display: flex; flex-direction: column;
}
.panel-title { font-size: 19px; margin: 0 0 18px; font-weight: 700; }
.count { color: var(--muted-2); font-weight: 500; font-size: 14px; }
.clear-failed {
  font: inherit; font-size: 12.5px; font-weight: 600; cursor: pointer; vertical-align: middle;
  color: var(--err); background: rgba(255,122,122,.1); border: 1px solid var(--line);
  border-radius: 999px; padding: 4px 12px; margin-left: 8px; transition: all .14s;
}
.clear-failed:hover { border-color: var(--err); background: rgba(255,122,122,.18); }
.song-actions .cancel { color: var(--err); }
.song-actions .cancel:hover { border-color: var(--err); background: rgba(255,122,122,.12); }

/* edit banner */
.edit-banner {
  display: flex; align-items: flex-start; gap: 12px; justify-content: space-between;
  background: rgba(139,108,255,.12); border: 1px solid var(--accent);
  border-radius: 12px; padding: 13px 15px; margin-bottom: 18px; font-size: 13.5px;
  animation: pop .25s ease;
}
.edit-text { color: var(--text); }
.edit-banner .keep { display: flex; align-items: center; gap: 8px; margin-top: 8px; color: var(--muted); font-weight: 500; cursor: pointer; }
.edit-banner .keep input { accent-color: var(--accent); width: 16px; height: 16px; }
.edit-banner #editCancel {
  flex: none; cursor: pointer; background: transparent; border: none; color: var(--muted);
  font-size: 18px; line-height: 1; padding: 2px 4px;
}
.edit-banner #editCancel:hover, .edit-banner #coverCancel:hover { color: var(--text); }
.edit-banner #coverCancel { flex: none; cursor: pointer; background: transparent; border: none; color: var(--muted); font-size: 18px; line-height: 1; padding: 2px 4px; }
.cover-strength-lbl { display: block; margin: 9px 0 2px; }
.edit-banner input[type=range] { width: 100%; accent-color: var(--accent); }
#coverBVal { color: var(--accent-3); font-weight: 700; }

/* ---------- form ---------- */
.field { margin-bottom: 22px; }
label { display: block; font-weight: 600; font-size: 14.5px; margin-bottom: 3px; }
.opt { color: var(--muted-2); font-weight: 500; font-size: 12.5px; }
.req {
  color: var(--accent-2); font-weight: 600; font-size: 11px; text-transform: uppercase;
  letter-spacing: .04em; vertical-align: middle; margin-left: 4px;
}
.hint { margin: 0 0 9px; color: var(--muted); font-size: 13px; }
.hint em { color: var(--text); font-style: normal; font-weight: 500; }

input[type=text], textarea {
  width: 100%; background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px;
  font: inherit; resize: vertical; transition: border-color .15s, box-shadow .15s;
}
textarea { line-height: 1.5; }
input[type=text]:focus, textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(139,108,255,.22);
}
::placeholder { color: var(--muted-2); }

/* chips & marker buttons */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.chips button, .marker-btns button {
  font: inherit; font-size: 12.5px; cursor: pointer;
  background: var(--panel-2); color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 12px; transition: all .14s;
}
.chips button:hover, .marker-btns button:hover { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
/* lyric assistant */
.lyric-assist { margin-bottom: 10px; }
.assist-toggle {
  font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  color: #1a1326; background: var(--grad); border: none;
  border-radius: 10px; padding: 9px 15px; transition: transform .12s, box-shadow .2s;
  box-shadow: 0 8px 20px -10px rgba(139,108,255,.7);
}
.assist-toggle:hover { transform: translateY(-1px); }
.assist-toggle.open { background: var(--panel-2); color: var(--muted); box-shadow: none; }
.assist-panel { margin-top: 11px; padding: 14px; background: var(--bg); border: 1px solid var(--accent); border-radius: 12px; }
.assist-panel .hint { margin: 0 0 9px; }
.assist-row { display: flex; gap: 8px; }
.assist-row input {
  flex: 1; background: var(--panel); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 13px; font: inherit;
}
.assist-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(139,108,255,.22); }
.assist-lang { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; }
.assist-lang label { font-weight: 600; font-size: 13px; }
.assist-lang select {
  flex: 1; background: var(--panel); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; font: inherit; cursor: pointer;
}
.assist-lang select:focus { outline: none; border-color: var(--accent); }
.assist-row button {
  font: inherit; font-weight: 600; font-size: 13.5px; cursor: pointer; white-space: nowrap;
  color: #1a1326; background: var(--grad); border: none; border-radius: 10px; padding: 0 16px;
}
.assist-row button:disabled { filter: grayscale(.4) brightness(.85); cursor: not-allowed; }
.assist-end { justify-content: flex-end; margin-top: 4px; }

/* style builder */
.style-group { margin-bottom: 12px; }
.style-group > label { display: block; font-weight: 600; font-size: 13px; margin-bottom: 6px; color: var(--text); }
.style-group input {
  width: 100%; background: var(--panel); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; font: inherit;
}
.style-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(139,108,255,.22); }
.chips.sel { gap: 7px; }
.chips.sel button.on {
  color: #1a1326; background: var(--grad); border-color: transparent; font-weight: 600;
}

.marker-btns { display: flex; gap: 8px; margin-bottom: 9px; }
.marker-btns button { border-radius: 9px; font-weight: 500; }

/* file picker + reference controls */
.filepick {
  display: inline-block; cursor: pointer; font-weight: 500; font-size: 13.5px;
  background: var(--panel-2); color: var(--text); border: 1px dashed var(--line);
  border-radius: 11px; padding: 11px 16px; transition: all .15s;
}
.filepick:hover { border-color: var(--accent); color: var(--text); }
.ref-controls { margin-top: 12px; padding: 14px; background: var(--bg); border: 1px solid var(--line); border-radius: 12px; }
.ref-file { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.ref-name { font-size: 13px; color: var(--accent-3); font-weight: 600; word-break: break-all; flex: 1; }
.ref-file button {
  font: inherit; font-size: 12px; cursor: pointer; color: var(--err);
  background: transparent; border: 1px solid var(--line); border-radius: 8px; padding: 5px 11px;
}
.ref-file button:hover { border-color: var(--err); }
label.sub { font-weight: 500; font-size: 13px; color: var(--muted); margin-bottom: 2px; }
#coverVal { color: var(--accent-3); font-weight: 700; }
.ref-controls .subnote { margin: 10px 0 0; font-size: 12px; line-height: 1.45; }

/* range */
input[type=range] { width: 100%; accent-color: var(--accent); margin-top: 4px; }
.range-ends { display: flex; justify-content: space-between; color: var(--muted-2); font-size: 12px; margin-top: 2px; }
#durationVal { color: var(--accent-3); font-weight: 700; }

/* segmented quality */
.seg { display: flex; gap: 10px; }
.seg button {
  flex: 1; font: inherit; cursor: pointer; text-align: center;
  background: var(--bg); border: 1px solid var(--line); color: var(--muted);
  border-radius: 12px; padding: 12px; transition: all .15s; font-weight: 600;
}
.seg button small { display: block; font-weight: 400; font-size: 11.5px; color: var(--muted-2); margin-top: 2px; }
.seg button.active { color: var(--text); border-color: transparent; background: rgba(139,108,255,.16); box-shadow: inset 0 0 0 1.5px var(--accent); }
.seg button.active small { color: var(--muted); }

/* generate button */
.generate {
  width: 100%; font: inherit; font-weight: 700; font-size: 16px; cursor: pointer;
  color: #1a1326; background: var(--grad); border: none; border-radius: 14px;
  padding: 15px; margin-top: 4px; transition: transform .12s, box-shadow .2s, filter .2s;
  box-shadow: 0 12px 28px -10px rgba(139,108,255,.7);
}
.generate:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 18px 34px -10px rgba(139,108,255,.8); }
.generate:active:not(:disabled) { transform: translateY(0); }
.generate:disabled { filter: grayscale(.4) brightness(.8); cursor: not-allowed; }
.footnote { color: var(--muted-2); font-size: 12.5px; text-align: center; margin: 12px 0 0; }
.footnote strong { color: var(--muted); }

/* ---------- library ---------- */
.lib-list {
  display: flex; flex-direction: column; gap: 14px;
  flex: 1 1 auto; min-height: 0; overflow-y: auto;
  margin: 0 -6px; padding: 2px 6px;   /* breathing room for the scrollbar */
}
.empty { text-align: center; color: var(--text); padding: 30px 10px; }
.empty .muted { color: var(--muted); font-size: 14px; }
.empty p { margin: 4px 0; }

.song {
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent), var(--bg-soft);
  border: 1px solid var(--line); border-radius: 14px; padding: 16px 17px;
  animation: pop .25s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(8px); } }
.song-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.song-title { font-weight: 700; font-size: 16px; font-family: "Bricolage Grotesque"; }
.song-style { color: var(--muted); font-size: 13px; margin-top: 2px; }
.song-meta { color: var(--muted-2); font-size: 12px; margin-top: 6px; display: flex; gap: 12px; flex-wrap: wrap; }

.badge { font-size: 11.5px; font-weight: 600; padding: 4px 10px; border-radius: 999px; white-space: nowrap; }
.badge.queued  { background: rgba(255,209,102,.14); color: var(--accent-3); }
.badge.running { background: rgba(139,108,255,.16); color: #b9a6ff; }
.badge.done    { background: rgba(94,224,160,.14); color: var(--ok); }
.badge.error   { background: rgba(255,122,122,.14); color: var(--err); }

.song-body { margin-top: 13px; }
.status-line { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13.5px; }
.spinner {
  width: 16px; height: 16px; border-radius: 50%; flex: none;
  border: 2.5px solid rgba(255,255,255,.18); border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
audio { width: 100%; margin-top: 4px; border-radius: 10px; }
.song-actions { display: flex; gap: 8px; margin-top: 12px; }
.song-actions a, .song-actions button {
  font: inherit; font-size: 13px; cursor: pointer; text-decoration: none;
  border-radius: 9px; padding: 8px 13px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--text); transition: all .14s;
}
.song-actions a:hover, .song-actions .dl:hover { border-color: var(--accent); }
.song-actions .del { color: var(--err); margin-left: auto; }
.song-actions .del:hover { background: rgba(255,122,122,.12); border-color: var(--err); }
.song-actions .retry { color: var(--accent-3); }
.song-actions .again { color: #b9a6ff; }
.song-actions .again:hover { border-color: var(--accent); }
.song-actions .edit { color: var(--accent-3); }
.song-actions .edit:hover { border-color: var(--accent-3); }
.song-actions .cover { color: var(--accent-2); }
.song-actions .cover:hover { border-color: var(--accent-2); }
.err-msg { color: var(--err); font-size: 13px; margin-top: 4px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 30px);
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  padding: 12px 20px; border-radius: 12px; box-shadow: var(--shadow);
  opacity: 0; pointer-events: none; transition: all .25s; font-size: 14px; z-index: 50; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { border-color: var(--err); }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .studio, .library { position: static; max-height: none; display: block; }
  .lib-list { overflow: visible; min-height: 0; margin: 0; padding: 0; }
  .howto { grid-template-columns: 1fr; }
}