/* reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: #080808;
  color: #f0e6c0;
  font-family: 'Rajdhani', sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ─── tokens ─────────────────────────────────────────────────────── */
:root {
  --gold:      #FFD700;
  --gold-mid:  #D4A800;
  --gold-dark: #8B6000;
  --gold-a20:  rgba(255,215,0,.20);
  --gold-a10:  rgba(255,215,0,.10);
  --gold-a05:  rgba(255,215,0,.05);
  --bg:        #080808;
  --bg1:       #0e0e0e;
  --bg2:       #141414;
  --text:      #f0e6c0;
  --text-dim:  #6b5f3a;
  --glow-sm:   0 0 8px rgba(255,215,0,.5);
  --glow-md:   0 0 16px rgba(255,215,0,.4), 0 0 40px rgba(255,215,0,.15);
  --glow-lg:   0 0 30px rgba(255,215,0,.55), 0 0 80px rgba(255,215,0,.2);
}

/* ─── screens ────────────────────────────────────────────────────── */
.screen { display: none; position: absolute; inset: 0; flex-direction: column; }
.screen.active { display: flex; }

/* ═══════════════════════════════════════════════════════════════════
   START SCREEN
═══════════════════════════════════════════════════════════════════ */
#screen-start {
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 80% 55% at 50% 38%, rgba(30,18,0,.95) 0%, var(--bg) 70%);
}

#bg-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.start-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 52px;
}

/* logo */
.start-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  line-height: 1;
}
.logo-eyebrow {
  font-family: 'Oswald', sans-serif;
  font-weight: 200;
  font-size: 13px;
  letter-spacing: 10px;
  color: var(--gold-mid);
  margin-bottom: 8px;
}
.logo-main {
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: 108px;
  letter-spacing: 22px;
  color: var(--gold);
  text-shadow: var(--glow-lg);
  /* subtle inner structure */
  background: linear-gradient(175deg, #fff7cc 0%, #FFD700 35%, #C8960C 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(255,215,0,.6));
}
.logo-sub {
  font-size: 12px;
  letter-spacing: 5px;
  color: var(--text-dim);
  margin-top: 14px;
  text-transform: uppercase;
}

/* input area */
.start-input-wrap {
  width: 520px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.input-label {
  font-size: 10px;
  letter-spacing: 5px;
  color: var(--text-dim);
  font-weight: 600;
}
.drop-zone {
  position: relative;
  height: 110px;
  border: 1px dashed var(--gold-dark);
  border-radius: 4px;
  background: #0a0a0a;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .18s, box-shadow .18s, background .18s;
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--gold-mid);
  background: rgba(255,215,0,.04);
  box-shadow: 0 0 0 1px var(--gold-dark), var(--glow-sm);
}
.drop-zone.has-file {
  border-style: solid;
  border-color: var(--gold-dark);
  background: rgba(255,215,0,.03);
}
.drop-zone input[type="file"] {
  display: none;
}
.drop-zone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  pointer-events: none;
}
.drop-zone-icon {
  font-size: 26px;
  color: var(--gold-dark);
  line-height: 1;
  transition: color .18s;
}
.drop-zone.has-file .drop-zone-icon { color: var(--gold); }
.drop-zone-text {
  font-family: 'Oswald', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 6px;
  color: var(--text-dim);
  transition: color .18s;
  max-width: 460px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.drop-zone.has-file .drop-zone-text { color: var(--gold); letter-spacing: 2px; font-size: 12px; }
.drop-zone-sub {
  font-size: 10px;
  letter-spacing: 2px;
  color: rgba(107,95,58,.5);
}
.drop-zone.has-file .drop-zone-sub { display: none; }
#shred-btn {
  height: 52px;
  width: 100%;
  background: var(--gold);
  border: none;
  color: #000;
  font-family: 'Oswald', sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 4px;
  cursor: pointer;
  transition: background .15s;
  border-radius: 4px;
}
#shred-btn:hover  { background: #ffe14d; }
#shred-btn:active { background: var(--gold-mid); }
#shred-btn:disabled { background: #1e1e1e; color: #444; cursor: not-allowed; }
#status-msg {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--gold-dark);
  min-height: 16px;
  text-transform: uppercase;
}

/* difficulty selector */
.diff-wrap {
  width: 520px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.diff-row {
  display: flex;
  gap: 0;
  height: 42px;
  border: 1px solid var(--gold-dark);
  border-radius: 4px;
  overflow: hidden;
}
.diff-btn {
  flex: 1;
  background: #0a0a0a;
  border: none;
  border-right: 1px solid var(--gold-dark);
  color: var(--text-dim);
  font-family: 'Oswald', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.diff-btn:last-child { border-right: none; }
.diff-btn:hover { background: rgba(255,215,0,.07); color: var(--gold); }
.diff-btn-active {
  background: rgba(255,215,0,.12);
  color: var(--gold);
  box-shadow: inset 0 0 0 1px var(--gold-dark);
}
.diff-btn-extreme { color: rgba(220,60,60,.70); }
.diff-btn-extreme:hover { background: rgba(220,60,60,.08); color: #e05050; }
.diff-btn-extreme.diff-btn-active {
  background: rgba(220,60,60,.12);
  color: #e05050;
  box-shadow: inset 0 0 0 1px rgba(180,40,40,.5);
}

/* mode selector */
.mode-wrap {
  width: 520px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.mode-original-row {
  display: flex;
  height: 42px;
  border: 1px solid var(--gold-dark);
  border-radius: 4px;
  overflow: hidden;
}
.mode-stems-row {
  display: flex;
  height: 42px;
  border: 1px solid var(--gold-dark);
  border-radius: 4px;
  overflow: hidden;
}
.mode-btn {
  flex: 1;
  background: #0a0a0a;
  border: none;
  border-right: 1px solid var(--gold-dark);
  color: var(--text-dim);
  font-family: 'Oswald', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  cursor: pointer;
  transition: background .15s, color .15s;
  width: 100%;
}
.mode-btn:last-child { border-right: none; }
.mode-btn:hover { background: rgba(255,215,0,.07); color: var(--gold); }
.mode-btn-active {
  background: rgba(255,215,0,.12);
  color: var(--gold);
  box-shadow: inset 0 0 0 1px var(--gold-dark);
}

/* key hints */
.start-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.controls-keys {
  display: flex;
  gap: 12px;
}
.ctrl-key {
  width: 52px;
  height: 52px;
  border: 1px solid rgba(255,215,0,.25);
  border-bottom: 3px solid rgba(255,215,0,.25);
  border-radius: 6px;
  background: linear-gradient(180deg, #151515 0%, #0e0e0e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Oswald', sans-serif;
  font-size: 22px;
  font-weight: 500;
  color: var(--gold);
  box-shadow: 0 2px 8px rgba(0,0,0,.6);
}
.controls-hint {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--text-dim);
}

/* ═══════════════════════════════════════════════════════════════════
   GAME SCREEN
═══════════════════════════════════════════════════════════════════ */
#screen-game {
  background: var(--bg);
}

/* HUD */
#hud {
  height: 64px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: rgba(0,0,0,.85);
  border-bottom: 1px solid rgba(255,215,0,.1);
}
.hud-label {
  font-size: 10px;
  letter-spacing: 4px;
  color: var(--text-dim);
  font-weight: 600;
  display: block;
}
.hud-val {
  font-family: 'Oswald', sans-serif;
  font-size: 32px;
  color: var(--gold);
  letter-spacing: 2px;
  text-shadow: var(--glow-sm);
  line-height: 1;
}
.hud-score-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.hud-mult {
  font-family: 'Oswald', sans-serif;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 1px;
  color: rgba(255,215,0,.45);
  transition: color .15s, text-shadow .15s;
}
.hud-mult.maxed {
  color: var(--gold);
  text-shadow: var(--glow-md);
}
.hud-stat { display: flex; flex-direction: column; gap: 2px; min-width: 150px; }
.hud-stat-right { align-items: flex-end; }
.hud-center {
  flex: 1;
  display: flex;
  justify-content: center;
}
#song-title-hud {
  font-family: 'Oswald', sans-serif;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 2px;
  color: rgba(240,230,192,.55);
  max-width: 360px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.health-bar {
  width: 148px;
  height: 6px;
  background: #1a1a1a;
  border-radius: 3px;
  border: 1px solid rgba(255,215,0,.15);
  overflow: hidden;
  margin-top: 4px;
}
#health-fill {
  height: 100%;
  width: 75%;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold));
  border-radius: 3px;
  transition: width .08s linear, background .3s;
  box-shadow: 0 0 6px rgba(255,215,0,.35);
}

/* game layout */
#game-layout {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* side panel */
#side-panel {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  gap: 18px;
  border-right: 1px solid rgba(255,215,0,.07);
  background: rgba(0,0,0,.3);
}
#now-playing { display: flex; flex-direction: column; gap: 3px; }
#np-title {
  font-family: 'Oswald', sans-serif;
  font-size: 13px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: .5px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
#np-artist { font-size: 11px; letter-spacing: 2px; color: var(--text-dim); }
#combo-block {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
#combo-val {
  font-family: 'Oswald', sans-serif;
  font-size: 58px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  text-shadow: var(--glow-md);
  letter-spacing: -1px;
  transition: transform .06s ease-out;
}
#combo-val.bump { transform: scale(1.14); }

/* highway column */
#highway-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  background: var(--bg);
}
#highway { display: block; flex-shrink: 0; }

/* strike keys */
#strike-keys {
  display: flex;
}
.skey {
  flex: 1;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Oswald', sans-serif;
  font-size: 17px;
  letter-spacing: 2px;
  color: rgba(255,215,0,.28);
  border-top: 1px solid rgba(255,215,0,.1);
  transition: color .05s, background .05s, text-shadow .05s;
  background: rgba(0,0,0,.4);
}
.skey.lit {
  color: var(--gold);
  background: rgba(255,215,0,.07);
  text-shadow: var(--glow-sm);
}
#skey-f, #skey-k { color: rgba(255,149,0,.28); }
#skey-f.lit, #skey-k.lit {
  color: #FF9500;
  background: rgba(255,149,0,.07);
  text-shadow: 0 0 8px rgba(255,149,0,.5);
}

/* judgment */
#judgment {
  position: fixed;
  left: 50%;
  top: 46%;
  transform: translate(-50%, -50%) scale(.9);
  font-family: 'Oswald', sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 8px;
  color: var(--gold);
  text-shadow: var(--glow-md);
  pointer-events: none;
  opacity: 0;
  transition: opacity .22s ease-out, transform .22s ease-out;
  z-index: 50;
  white-space: nowrap;
}
#judgment.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  transition: none;
}

/* miss vignette */
#miss-vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 49;
  border-radius: 0;
  box-shadow: inset 0 0 0 transparent;
  transition: box-shadow .08s;
}
#miss-vignette.flash {
  box-shadow: inset 0 0 80px rgba(200,0,0,.35);
}

/* ═══════════════════════════════════════════════════════════════════
   RESULT SCREEN
═══════════════════════════════════════════════════════════════════ */
#screen-result {
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 80% 55% at 50% 38%, rgba(30,18,0,.95) 0%, var(--bg) 70%);
}
.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}
#result-headline {
  font-family: 'Oswald', sans-serif;
  font-size: 72px;
  font-weight: 700;
  letter-spacing: 14px;
  background: linear-gradient(175deg, #fff7cc 0%, #FFD700 40%, #C8960C 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(255,215,0,.5));
}
#result-song {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--text-dim);
  margin-top: -18px;
  max-width: 480px;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.result-row {
  display: flex;
  align-items: stretch;
  border: 1px solid rgba(255,215,0,.12);
  border-radius: 6px;
  overflow: hidden;
}
.result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 28px 52px;
  background: rgba(255,215,0,.02);
}
.rs-val {
  font-family: 'Oswald', sans-serif;
  font-size: 44px;
  font-weight: 700;
  color: var(--gold);
  text-shadow: var(--glow-sm);
  letter-spacing: 1px;
}
.rs-label {
  font-size: 10px;
  letter-spacing: 4px;
  color: var(--text-dim);
  font-weight: 600;
}
.rs-divider { width: 1px; background: rgba(255,215,0,.1); }
.result-pills {
  display: flex;
  gap: 10px;
}
.rpill {
  padding: 5px 16px;
  border-radius: 20px;
  font-size: 12px;
  letter-spacing: 2px;
  border: 1px solid;
}
.rpill-p { border-color: rgba(255,215,0,.3);  color: var(--gold-mid); }
.rpill-g { border-color: rgba(255,165,0,.25); color: #c8840a; }
.rpill-m { border-color: rgba(180,60,60,.3);  color: #a04040; }
.result-btns {
  display: flex;
  gap: 14px;
  margin-top: 8px;
}
.result-btns button {
  background: transparent;
  border: 1px solid rgba(255,215,0,.3);
  color: var(--gold);
  font-family: 'Oswald', sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 5px;
  padding: 14px 40px;
  border-radius: 3px;
  cursor: pointer;
  transition: border-color .18s, background .18s, box-shadow .18s;
}
.result-btns button:hover {
  border-color: var(--gold);
  background: rgba(255,215,0,.06);
  box-shadow: var(--glow-sm);
}
#new-song-btn {
  border-color: rgba(255,215,0,.15) !important;
  color: var(--text-dim) !important;
}
#new-song-btn:hover {
  border-color: rgba(255,215,0,.4) !important;
  color: var(--gold) !important;
}

/* countdown */
#countdown-overlay {
  display: none;
  position: fixed;
  inset: 0;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 300;
  background: rgba(0,0,0,.45);
}
#countdown-num {
  font-family: 'Oswald', sans-serif;
  font-size: 160px;
  font-weight: 700;
  color: var(--gold);
  filter: drop-shadow(0 0 40px rgba(255,215,0,.7));
  opacity: 0;
}
@keyframes cd-pop {
  0%   { opacity: 0;   transform: scale(1.8); }
  18%  { opacity: 1;   transform: scale(1);   }
  72%  { opacity: 1;   transform: scale(1);   }
  100% { opacity: 0;   transform: scale(.65); }
}
#countdown-num.pop {
  animation: cd-pop .85s ease-out forwards;
}