/* Karaoke Songbook — Readable Dark UI (simplified, indented tree) */

/* ========================
   Global Design Tokens
   ======================== */
:root {
  /* Palette sourced from theme.css */
  --panel: var(--bg-2, #13163b); /* slightly lighter surface color */
  --accent: var(--accent-mid, var(--purple, #9bb4ff));
  --danger: #f87171;
  --shadow: rgba(0,0,0,0.5);

  /* Background image tuning */
  --bg-overlay-alpha: 0.18;         /* darkness of overlay over background image */
  --bg-blur-initial: 3px;           /* blur while loading */
  --bg-blur-ready: 5px;             /* blur after image is ready */
  --bg-brightness-initial: 0.8;    /* brightness while loading (1 = normal) */
  --bg-brightness-ready: 0.7;         /* brightness after image is ready */

  /* Spacing (8px scale) */
  --s-1: 8px;
  --s-2: 16px;
  --s-3: 24px;
  --s-4: 32px;

  /* Indentation */
  --indent-artist: 24px;  /* level 1 */
  --indent-song: 48px;    /* level 2 */

  /* Lines & guides */
  --guide: rgba(255,255,255,0.22);
  --connector: rgba(255,255,255,0.22);

  /* Radii */
  --radius-sm: 8px;
  --radius: 12px;

  /* Typography */
  --font-title: var(--font-heading, "Montserrat", Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif);
  /* Typography scales */
  --fs-cat: 1.65rem;    /* was 1.5rem */
  --fs-artist: 1.3rem;  /* was 1.2rem */
  --fs-song: 1.1rem;    /* was 1rem */
  --fw-cat: 800;
  --fw-artist: 600;
  --fw-song: 450;

  color-scheme: dark;
}

/* ========================
   Global
   ======================== */
* { box-sizing: border-box; }
html, body { height: 100%; }
/* Globally increase font sizing (1rem -> ~18px) */
html { font-size: 112.5%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body, Inter, Segoe UI, system-ui, -apple-system, Roboto, Ubuntu, Arial, sans-serif);
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background image layer (vinyls) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  /* Fallback: PNG background */
  background: linear-gradient(rgba(0,0,0,var(--bg-overlay-alpha, 0.18)), rgba(0,0,0,var(--bg-overlay-alpha, 0.18))), url('./assets/vinyls-cool.png');
  /* Modern: prefer WebP when supported */
  background-image: linear-gradient(rgba(0,0,0,var(--bg-overlay-alpha, 0.18)), rgba(0,0,0,var(--bg-overlay-alpha, 0.18))), image-set(
    url('./assets/vinyls-cool.webp') type('image/webp'),
    url('./assets/vinyls-cool.png') type('image/png')
  );
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  /* Use a fixed-positioned pseudo-element instead of background-attachment: fixed
     to ensure CSS filters apply reliably across browsers. */
  /* background-attachment: fixed; */
  -webkit-filter: blur(var(--bg-blur-initial, 3px)) brightness(var(--bg-brightness-initial, 0.98));
  filter: blur(var(--bg-blur-initial, 3px)) brightness(var(--bg-brightness-initial, 0.98));
  transform: scale(1.005); /* hide edges from blur */
  opacity: 1;
  transition: filter .35s ease, opacity .35s ease, transform .35s ease;
}

/* After image is confirmed loaded: ease off blur/darkness */
body.bg-ready::before {
  -webkit-filter: blur(var(--bg-blur-ready, 0px)) brightness(var(--bg-brightness-ready, 1));
  filter: blur(var(--bg-blur-ready, 0px)) brightness(var(--bg-brightness-ready, 1));
  transform: scale(1);
  opacity: 1;
}

/* Use theme heading font for headings */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading, var(--font-title, Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif)); }

.container { max-width: 980px; margin: 0 auto; padding: 0 var(--s-2); }
.muted { color: var(--muted); }

/* ========================
   Header
   ======================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  background: rgba(16,18,46,0.55);
  border-bottom: 1px solid rgba(230,235,241,0.12);
}

.site-header .container { display: grid; gap: var(--s-2); padding-top: var(--s-2); padding-bottom: var(--s-2); }

.brand {
  --brand-logo-width: clamp(180px, 60vw, 480px);
  display: inline-grid;
  justify-items: center;
  align-content: center;
  gap: 8px;
  justify-self: center;
  text-align: center;
}
.brand-logo { width: var(--brand-logo-width); height: auto; display: block; }
.brand-subtitle {
  width: var(--brand-logo-width);
  margin: 0;
  font-family: var(--font-body, Montserrat, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: 0; /* JS will increase to fit logo width */
  color: var(--text);
  white-space: nowrap; /* prevent wrapping so tracking can expand across the line */
}

/* Ensure stacked layout on small screens */
@media (max-width: 640px) {
  .brand { display: grid; grid-template-columns: 1fr; }
  .brand-logo { justify-self: center; }
  .brand-subtitle { justify-self: center; text-align: center; margin-top: 4px; }
}

/* ========================
   Search
   ======================== */
.search { display: flex; align-items: center; gap: var(--s-1); position: relative; }
.search label { font-size: 1rem; color: var(--muted); }
.search input[type="search"] {
  flex: 1;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(230,235,241,0.14);
  background: var(--panel);
  color: var(--text);
  font-family: var(--font-body, Inter, Segoe UI, system-ui, -apple-system, Roboto, Ubuntu, Arial, sans-serif);
  /* Keep search input text size unchanged from before (16px) */
  font-size: 16px;
  outline: none;
  transition: box-shadow .18s ease, border-color .18s ease, transform .18s ease;
}
.search input[type="search"]:hover { transform: translateY(-1px); box-shadow: 0 6px 14px -8px var(--shadow); }
.search input[type="search"]:focus { border-color: var(--focus, var(--accent)); box-shadow: 0 0 0 3px rgba(155,180,255,0.28); }
.search input[type="search"]:active { transform: translateY(0); }

/* ========================
   Category (Accordion Panels)
   ======================== */
main.container { padding-top: var(--s-2); padding-bottom: var(--s-3); }

.panel {
  /* Semi-transparent surface to let background show through */
  background: rgba(16,18,46,0.42);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  border: 1px solid rgba(230,235,241,0.10);
  border-radius: var(--radius);
  overflow: clip;
  -webkit-backdrop-filter: blur(8px) saturate(120%);
  backdrop-filter: blur(8px) saturate(120%);
  box-shadow: 0 10px 35px -20px var(--shadow);
  margin: var(--s-2) auto;
  /* Make boxes narrower with gutters around them */
  width: min(860px, 100% - 48px);
}

.panel .summary {
  list-style: none; /* Category = level 0 */
  cursor: pointer;
  padding: var(--s-2);
  display: flex; align-items: center; gap: var(--s-1);
  font-family: var(--font-heading, var(--font-title, Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif));
  font-weight: var(--fw-cat);
  font-size: var(--fs-cat);
  color: var(--text);
  border-bottom: 1px solid rgba(230,235,241,0.12);
}
.panel .summary::-webkit-details-marker { display: none; }



/* ========================
   Artist (level 1, indented + vertical guide)
   ======================== */
ul.songs { margin: 0; padding: var(--s-1) 0 var(--s-2); }

li.artist-header {
  position: relative;
  padding: 10px var(--s-2) 6px calc(var(--s-2) + var(--indent-artist));
  font-size: var(--fs-artist);
  font-weight: var(--fw-artist);
  color: var(--text);
  font-family: var(--font-heading, var(--font-title, Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif));
}

/* subtle vertical guide line for artist level */
li.artist-header::before {
  content: "";
  position: absolute;
  left: calc(var(--s-2) + (var(--indent-artist) / 2));
  top: 0; bottom: 0;
  width: 2px;
  background: var(--guide);
  border-radius: 2px;
}

.panel ul.songs:first-of-type > li.artist-header { padding-top: 12px; }

/* ========================
   Song (level 2, indented + connector + bullet)
   ======================== */
li.song-item {
  position: relative;
  padding: 6px var(--s-2) 6px calc(var(--s-2) + var(--indent-song));
  font-weight: var(--fw-song);
  font-size: var(--fs-song);
  color: var(--muted); /* songs are more muted */
  font-family: var(--font-body, Inter, Segoe UI, system-ui, -apple-system, Roboto, Ubuntu, Arial, sans-serif);
}


/* bullet / icon for songs */
li.song-item::before {
  content: "•";
  position: absolute;
  left: calc(var(--s-2) + var(--indent-song) - 22px);
  top: 50%; transform: translateY(-50%);
  font-size: 1rem;
  opacity: .9;
}

/* ========================
   Interaction states
   ======================== */
li.song-item:hover { background: rgba(255,255,255,0.08); text-decoration: underline; text-underline-offset: 2px; }
li.artist-header:focus-visible { outline: 2px solid var(--focus, var(--accent)); outline-offset: 2px; }
li.song-item:focus-visible { outline: 2px solid var(--focus, var(--accent)); outline-offset: 2px; }
li.artist-header:hover { background: rgba(255,255,255,0.04); }
.panel .summary:hover { background: rgba(255,255,255,0.04); }
.panel .summary:focus-visible { outline: 2px solid var(--focus, var(--accent)); outline-offset: 2px; }

/* Ensure scroll targets are not hidden behind sticky header */
li.artist-header, li.song-item { scroll-margin-top: 96px; }

.no-results { color: var(--muted); padding: 12px 6px 0; }

/* ========================
   Suggestions (Listbox)
   ======================== */
.suggestions { position: absolute; top: calc(100% + var(--s-1)); left: 0; right: 0; z-index: 40; }
.suggestions[hidden] { display: none; }
.suggestions .panel { position: static; }
.suggestions .list {
  background: rgba(16,18,46,0.42);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  border: 1px solid rgba(230,235,241,0.12);
  border-radius: var(--radius);
  margin-top: var(--s-1);
  box-shadow: 0 16px 40px -22px var(--shadow);
  overflow: clip;
  -webkit-backdrop-filter: blur(6px) saturate(120%);
  backdrop-filter: blur(6px) saturate(120%);
}
.suggestions .item { padding: 10px 12px; border-top: 1px solid rgba(230,235,241,0.12); cursor: pointer; color: var(--text); }
.suggestions .item:first-child { border-top: 0; }
.suggestions .item[aria-selected="true"], .suggestions .item.active { background: rgba(255,255,255,0.10); }
.suggestions .hint { color: var(--muted); font-size: 1rem; padding: 8px 12px; }

/* ========================
   Highlighted song
   ======================== */
.highlight { background: rgba(255,255,255,0.12); transition: background .6s ease; }
.highlight.fade { background: transparent; }

/* ========================
   Motion preferences
   ======================== */
@media (prefers-reduced-motion: reduce) {
  .search input[type="search"] { transition: none; }
  body::before { transition: none; }
}

/* ========================
   Responsive (mobile-first tweaks)
   ======================== */
@media (max-width: 640px) {
  /* Tighter spacing and readable sizes on phones */
  :root {
    --s-1: 8px;
    --s-2: 12px;
    --s-3: 20px;
    --indent-artist: 16px;
    --indent-song: 32px;
    --fs-cat: 1.35rem;
    --fs-artist: 1.15rem;
    --fs-song: 1.06rem;
  }

  .site-header .container { gap: var(--s-1); }
  .brand { justify-content: center; text-align: center; }
  .brand .title { font-size: clamp(1.6rem, 6vw + .6rem, 2.2rem); }

  .search { gap: var(--s-1); }
  .search label { display: none; }
  /* Keep search input text size unchanged on mobile as well (16px) */
  .search input[type="search"] { padding: 12px 12px; font-size: 16px; }

  main.container { padding-top: var(--s-1); padding-bottom: var(--s-2); }

  /* Panels: add side gutters and spacing so background shines through */
  .panel { width: calc(100% - 28px); margin: var(--s-1) auto; }

  /* Increase tap targets */
  li.song-item { padding: 10px var(--s-2) 10px calc(var(--s-2) + var(--indent-song)); }
  li.artist-header { padding: 12px var(--s-2) 8px calc(var(--s-2) + var(--indent-artist)); }

  /* Suggestions fit viewport height */
  .suggestions .list { max-height: 60vh; overflow: auto; }
}