/* ─── Reset & base ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #09090e;
  --surface:     #111118;
  --surface2:    #18181f;
  --surface3:    #222232;
  --border:      #1f1f30;
  --border2:     #2a2a42;
  --text:        #e4e4f0;
  --muted:       #5a5a80;
  --amber:       #f5a623;
  --amber-dim:   rgba(245,166,35,0.12);
  --amber-glow:  rgba(245,166,35,0.3);
  --green:       #1db954;
  --green-dim:   rgba(29,185,84,0.12);
  --red:         #e53e3e;
  --red-dim:     rgba(229,62,62,0.12);
  --yellow:      #d4a017;
  --yellow-dim:  rgba(212,160,23,0.12);
  --r:           10px;
  --r-sm:        6px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 15px;
  overflow-x: hidden;
}

/* ─── Grain overlay ─────────────────────────────────────────────────────── */
#grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  animation: grain 0.4s steps(1) infinite;
}
@keyframes grain {
  0%,100%{background-position:0 0}
  10%     {background-position:-5% -10%}
  20%     {background-position:-15% 5%}
  30%     {background-position:7% -25%}
  40%     {background-position:-5% 25%}
  50%     {background-position:-15% 10%}
  60%     {background-position:15% 0%}
  70%     {background-position:0 15%}
  80%     {background-position:3% 35%}
  90%     {background-position:-10% 10%}
}

/* ─── Header ────────────────────────────────────────────────────────────── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9,9,14,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 600px;
  margin: 0 auto;
  padding: 13px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-glyph {
  font-size: 20px;
  color: var(--amber);
  line-height: 1;
}
.logo-text {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 26px;
  letter-spacing: 3px;
  color: var(--text);
  line-height: 1;
}
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.song-count {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.5px;
}
.icon-btn {
  width: 32px; height: 32px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border2);
  background: var(--surface2);
  color: var(--muted);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color .2s, color .2s;
}
.icon-btn svg { width: 14px; height: 14px; }
.icon-btn:hover { border-color: var(--amber); color: var(--amber); }
.icon-btn.spinning svg { animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Layout ────────────────────────────────────────────────────────────── */
.main {
  max-width: 600px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}
.screen { display: none; }
.screen.active { display: block; }
.hidden { display: none !important; }

/* ─── Start screen ──────────────────────────────────────────────────────── */
.start-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 0 24px;
  gap: 28px;
  text-align: center;
}

/* FM tuner graphic */
.tuner {
  width: 100%;
  max-width: 380px;
  height: 48px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}
.tuner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    transparent 0,
    transparent 7px,
    var(--border) 7px,
    var(--border) 8px
  );
}
.tuner-needle {
  position: absolute;
  top: 0; bottom: 0;
  left: 58%;
  width: 2px;
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber-glow), 0 0 24px var(--amber-glow);
  z-index: 2;
}
.tuner-scale {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  padding-bottom: 6px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  z-index: 1;
}
.tuner-mark { color: var(--amber); font-size: 9px; font-weight: 500; }

.start-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(42px, 9vw, 68px);
  line-height: 0.95;
  letter-spacing: 2px;
  color: var(--text);
}

.start-sub {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 340px;
}

/* Clip ladder */
.clip-ladder {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.ladder-step {
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface2);
  border: 1px solid var(--border2);
  padding: 5px 12px;
  border-radius: 20px;
}
.ladder-step span { color: var(--muted); font-size: 10px; }
.ladder-arrow { color: var(--border2); font-size: 18px; }

.btn-play-large {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 36px;
  background: var(--amber);
  border: none;
  border-radius: 50px;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 22px;
  letter-spacing: 3px;
  color: var(--bg);
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
  box-shadow: 0 0 24px var(--amber-glow);
}
.btn-play-large:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px var(--amber-glow);
}
.btn-play-large:active { transform: translateY(0); }
.btn-play-icon { font-size: 16px; }

.warning-msg {
  color: var(--red);
  font-size: 13px;
  padding: 10px 16px;
  background: var(--red-dim);
  border: 1px solid var(--red);
  border-radius: var(--r-sm);
  max-width: 380px;
}

/* ─── Clip steps ────────────────────────────────────────────────────────── */
.steps-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
  margin-bottom: 20px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}
.step-fill {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--surface3);
  transition: background .3s;
}
.step-dur {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.3px;
}

/* Step states */
.step.active .step-fill {
  background: var(--amber);
  animation: amber-pulse 1.4s ease-in-out infinite;
}
.step.active .step-dur { color: var(--amber); font-weight: 500; }

.step.skipped .step-fill { background: var(--yellow); }
.step.skipped .step-dur  { color: var(--yellow); }

.step.wrong .step-fill { background: var(--red); }
.step.wrong .step-dur  { color: var(--red); }

.step.correct .step-fill { background: var(--green); }
.step.correct .step-dur  { color: var(--green); }

@keyframes amber-pulse {
  0%,100% { opacity: 1; box-shadow: 0 0 0 0 var(--amber-glow); }
  50%     { opacity: 0.7; box-shadow: 0 0 8px 2px var(--amber-glow); }
}

/* ─── Guess history (wrong guesses) ────────────────────────────────────── */
.guess-history {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 12px;
  min-height: 0;
}
.guess-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--red-dim);
  border: 1px solid var(--red);
  border-radius: var(--r-sm);
  font-size: 13px;
  animation: slide-in .2s ease;
}
.guess-item-icon { color: var(--red); font-size: 12px; }
.guess-item-title { font-weight: 600; color: var(--text); }
.guess-item-artist { color: var(--muted); font-size: 12px; margin-left: auto; }
@keyframes slide-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Play zone / VU button ─────────────────────────────────────────────── */
.play-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.vu-btn {
  position: relative;
  width: 116px; height: 116px;
  border-radius: 50%;
  border: none;
  background: transparent;
  cursor: pointer;
  outline: none;
  transition: transform .15s;
}
.vu-btn:hover:not(:disabled) { transform: scale(1.04); }
.vu-btn:active:not(:disabled) { transform: scale(0.97); }
.vu-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.vu-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--border2);
  background: var(--surface);
  transition: border-color .2s, box-shadow .2s;
}
.vu-btn:not(:disabled):hover .vu-ring {
  border-color: var(--amber);
  box-shadow: 0 0 24px var(--amber-glow), inset 0 0 16px rgba(245,166,35,0.06);
}
.vu-btn.playing .vu-ring {
  border-color: var(--amber);
  box-shadow: 0 0 32px var(--amber-glow), inset 0 0 20px rgba(245,166,35,0.08);
  animation: vu-pulse .7s ease-in-out infinite alternate;
}
@keyframes vu-pulse {
  from { box-shadow: 0 0 16px var(--amber-glow), inset 0 0 10px rgba(245,166,35,0.05); }
  to   { box-shadow: 0 0 48px var(--amber-glow), inset 0 0 28px rgba(245,166,35,0.12); }
}

.vu-inner {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--text);
}
.vu-inner #play-icon {
  font-size: 30px;
  line-height: 1;
  color: var(--amber);
}
.play-dur {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 1px;
}

/* Progress bar */
.play-bar-wrap {
  width: 240px;
  height: 3px;
  background: var(--surface3);
  border-radius: 2px;
  overflow: hidden;
}
.play-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--amber), #ffcc6a);
  border-radius: 2px;
  transition: width linear;
  box-shadow: 0 0 6px var(--amber-glow);
}
.play-status {
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  letter-spacing: 0.2px;
  height: 18px;
}

/* ─── Guess zone ────────────────────────────────────────────────────────── */
.guess-zone {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.search-wrap { position: relative; }

.search-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--surface);
  border: 1.5px solid var(--border2);
  border-radius: var(--r);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 15px;
  outline: none;
  transition: border-color .2s, background .2s;
}
.search-input::placeholder { color: var(--muted); }
.search-input:focus {
  border-color: var(--amber);
  background: var(--surface2);
}

.search-drop {
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: var(--r);
  box-shadow: 0 12px 40px rgba(0,0,0,0.6);
  z-index: 50;
  max-height: 290px;
  overflow-y: auto;
}
.search-drop::-webkit-scrollbar { width: 3px; }
.search-drop::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.drop-item {
  padding: 11px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}
.drop-item:last-child { border-bottom: none; }
.drop-item:hover, .drop-item.hi { background: var(--surface3); }
.drop-item-info { display: flex; flex-direction: column; gap: 1px; }
.drop-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.drop-artist {
  font-size: 12px;
  color: var(--muted);
}
.drop-title mark, .drop-artist mark {
  background: var(--amber-dim);
  color: var(--amber);
  border-radius: 2px;
  padding: 0 2px;
}
.drop-empty {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  font-style: italic;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 8px;
}

.btn-skip {
  padding: 13px;
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  border-radius: var(--r);
  color: var(--muted);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 17px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.btn-skip:hover {
  border-color: var(--yellow);
  color: var(--yellow);
}

.btn-guess {
  padding: 13px;
  background: var(--amber);
  border: none;
  border-radius: var(--r);
  color: var(--bg);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 17px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: opacity .15s, transform .15s, box-shadow .15s;
  box-shadow: 0 0 16px var(--amber-glow);
}
.btn-guess:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 0 28px var(--amber-glow);
}
.btn-guess:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  box-shadow: none;
}

/* ─── Result screen ─────────────────────────────────────────────────────── */
.result-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 16px;
  animation: fade-up .35s ease;
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.result-emoji {
  font-size: 60px;
  display: block;
  margin-bottom: 12px;
  animation: emoji-pop .4s cubic-bezier(.17,.67,.3,1.4) both;
}
@keyframes emoji-pop {
  from { transform: scale(0); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.result-headline {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 38px;
  letter-spacing: 2px;
  margin-bottom: 22px;
}
.result-card.win  .result-headline { color: var(--green); }
.result-card.lose .result-headline { color: var(--red); }

.result-song {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: var(--r);
  padding: 16px 20px;
  margin-bottom: 10px;
}
.result-song-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 4px;
}
.result-song-artist {
  font-size: 13px;
  color: var(--muted);
}
.result-song-album {
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
  margin-top: 2px;
}

.result-detail {
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 18px;
}

/* Mini step recap */
.result-steps {
  display: flex;
  justify-content: center;
  gap: 5px;
  margin-bottom: 24px;
}
.rs { width: 34px; height: 6px; border-radius: 3px; background: var(--surface3); }
.rs.skipped { background: var(--yellow); }
.rs.wrong   { background: var(--red); }
.rs.correct { background: var(--green); }

/* Result buttons */
.result-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.r-btn-primary {
  background: var(--amber);
  color: var(--bg);
  border: none;
  border-radius: var(--r);
  padding: 13px 24px;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 18px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: opacity .15s;
  box-shadow: 0 0 16px var(--amber-glow);
}
.r-btn-primary:hover { opacity: 0.9; }

.r-btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border2);
  border-radius: var(--r);
  padding: 13px 24px;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 18px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: border-color .2s;
}
.r-btn-secondary:hover { border-color: var(--amber); }

.result-audio {
  width: 100%;
  margin-top: 18px;
  border-radius: 8px;
  accent-color: var(--amber);
}

/* ─── Loading overlay ───────────────────────────────────────────────────── */
.loading {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(9,9,14,0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
}
.loading-spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--border2);
  border-top-color: var(--amber);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  box-shadow: 0 0 16px var(--amber-glow);
}

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .main { padding: 16px 14px 32px; }
  .steps-row { padding: 12px 10px; gap: 4px; }
  .step-dur { font-size: 9px; }
  .vu-btn { width: 96px; height: 96px; }
  .vu-inner #play-icon { font-size: 26px; }
  .clip-ladder { gap: 4px; }
  .ladder-arrow { display: none; }
  .result-card { padding: 28px 18px; }
}