/* =========================================================================
   PULSEGRID — styles
   Dark-only by design: the play field is a neon canvas and a light theme
   would fight it. Colours are declared once on :root, never only inside a
   media query.
   ========================================================================= */

:root {
  --bg:        #07060f;
  --bg-2:      #0d0b1c;
  --panel:     rgba(19, 16, 40, 0.82);
  --panel-2:   rgba(29, 24, 58, 0.75);
  --line:      rgba(140, 120, 255, 0.22);
  --line-2:    rgba(140, 120, 255, 0.42);
  --text:      #e9e6ff;
  --dim:       #9d96c4;
  --cyan:      #00e5ff;
  --pink:      #ff2d95;
  --amber:     #ffd166;
  --violet:    #9d7bff;
  --lime:      #7bffb2;
  --red:       #ff5d6c;
  --shadow:    0 18px 50px rgba(0, 0, 0, 0.55);
  --radius:    16px;
  --font: "Chakra Petch", "Rajdhani", ui-sans-serif, system-ui, -apple-system,
          "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

/* The HTML hidden attribute is only a UA stylesheet rule, so any author rule
   setting `display` on the same element beats it. Make it unconditional. */
[hidden] { display: none !important; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

body {
  background:
    radial-gradient(120% 80% at 50% -10%, #241a4d 0%, transparent 60%),
    radial-gradient(80% 60% at 10% 110%, #35124a 0%, transparent 55%),
    var(--bg);
}

kbd {
  display: inline-block;
  min-width: 1.5em;
  padding: 1px 5px;
  margin: 0 2px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.06);
  font: 600 0.85em/1.4 var(--mono);
  text-align: center;
}

/* ---------------------------------------------------------------- canvas */

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  z-index: 0;
}

/* ---------------------------------------------------------------- screens */

.screen {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  padding: clamp(12px, 2.4vh, 28px) clamp(12px, 3vw, 34px);
  padding-top: max(clamp(12px, 2.4vh, 28px), env(safe-area-inset-top));
  padding-bottom: max(clamp(12px, 2.4vh, 28px), env(safe-area-inset-bottom));
  overflow-y: auto;
  overscroll-behavior: contain;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(58, 38, 122, 0.75) 0%, transparent 60%),
    rgba(7, 6, 15, 0.92);
  animation: fade-in 220ms ease both;
}

.screen.modal {
  align-items: center;
  justify-content: center;
  background: rgba(4, 3, 10, 0.9);
  backdrop-filter: blur(11px);
  -webkit-backdrop-filter: blur(11px);
}

/* Modals that can open on top of another one need to win the stack. */
#screen-calibrate { z-index: 12; }
#screen-pause, #screen-gate { z-index: 13; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .screen, .logo-b, .btn-play, .cal-beat.pulse { animation: none !important; }
}

/* ---------------------------------------------------------------- brand */

.brand { text-align: center; flex: 0 0 auto; }

.logo {
  margin: clamp(4px, 2vh, 22px) 0 6px;
  font-size: clamp(38px, 9vw, 86px);
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1;
}
.logo-a { color: var(--text); text-shadow: 0 0 26px rgba(0, 229, 255, 0.55); }
.logo-b {
  color: var(--pink);
  text-shadow: 0 0 26px rgba(255, 45, 149, 0.7);
  animation: flicker 4.5s steps(1, end) infinite;
}
@keyframes flicker {
  0%, 92%, 96%, 100% { opacity: 1; }
  94%, 97.5%         { opacity: 0.45; }
}

.tagline {
  margin: 0 0 clamp(8px, 2vh, 20px);
  color: var(--dim);
  font-size: clamp(12px, 1.6vw, 15px);
}

/* ---------------------------------------------------------------- panels */

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(14px, 2vw, 22px);
}

.panel-title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--violet);
}

.menu-body {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(12px, 1.6vw, 20px);
  align-content: start;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  min-height: 0;
}

.songlist-panel { display: flex; flex-direction: column; min-height: 0; }

/* ---------------------------------------------------------------- songlist */

.songlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  min-height: 0;
}

.song-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 11px 13px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--panel-2);
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms, transform 120ms, background 120ms;
}
.song-item:hover { border-color: var(--line-2); transform: translateX(2px); }
.song-item:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.song-item[aria-selected="true"] {
  border-color: var(--accent, var(--cyan));
  background: color-mix(in srgb, var(--accent, var(--cyan)) 14%, var(--panel-2));
}

.song-swatch {
  width: 6px;
  height: 34px;
  border-radius: 3px;
  background: var(--accent, var(--cyan));
  box-shadow: 0 0 14px var(--accent, var(--cyan));
}
.song-name { font-weight: 600; }
.song-sub { display: block; color: var(--dim); font-size: 12px; }
.song-bpm { color: var(--dim); font: 600 12px/1 var(--mono); letter-spacing: 0.06em; }

/* ---------------------------------------------------------------- detail */

.detail-panel { display: flex; flex-direction: column; gap: 4px; }

.song-detail { margin-bottom: 10px; }
.song-detail h3 {
  margin: 0 0 2px;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: 0.03em;
  color: var(--accent, var(--cyan));
}
.song-detail .meta { margin: 0 0 8px; color: var(--dim); font-size: 13px; }
.song-detail .blurb { margin: 0; font-size: 13px; line-height: 1.55; color: #c6c0e6; }

.diff-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }

.diff-btn {
  flex: 1 1 0;
  min-width: 74px;
  padding: 9px 6px 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--dim);
  font-family: inherit;
  cursor: pointer;
  transition: all 120ms;
}
.diff-btn .d-name { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.12em; }
.diff-btn .d-lv   { display: block; font: 700 18px/1.2 var(--mono); }
.diff-btn:hover { border-color: var(--line-2); color: var(--text); }
.diff-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.diff-btn[aria-checked="true"] {
  border-color: var(--dcolor);
  color: var(--dcolor);
  background: color-mix(in srgb, var(--dcolor) 16%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--dcolor) 28%, transparent);
}

.best-score {
  min-height: 42px;
  margin-bottom: 12px;
  padding: 9px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
  font: 500 13px/1.5 var(--mono);
  color: var(--dim);
}
.best-score b { color: var(--text); font-size: 15px; }
.best-score .grade { color: var(--amber); font-weight: 700; }

/* ---------------------------------------------------------------- buttons */

.btn {
  padding: 11px 20px;
  border: 1px solid var(--line-2);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 130ms;
}
.btn:hover { background: rgba(255, 255, 255, 0.11); border-color: var(--cyan); }
.btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--dim); }
.btn-ghost:hover { color: var(--text); }
.btn-small { padding: 7px 13px; font-size: 12px; }

.btn-primary {
  border-color: transparent;
  background: linear-gradient(96deg, var(--pink), var(--violet));
  color: #fff;
  box-shadow: 0 8px 26px rgba(255, 45, 149, 0.32);
}
.btn-primary:hover { filter: brightness(1.12); border-color: transparent; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; filter: none; }

.btn-play {
  width: 100%;
  margin-top: auto;
  padding: 15px;
  font-size: 19px;
  letter-spacing: 0.3em;
  animation: play-glow 2.6s ease-in-out infinite;
}
@keyframes play-glow {
  0%, 100% { box-shadow: 0 8px 26px rgba(255, 45, 149, 0.28); }
  50%      { box-shadow: 0 8px 38px rgba(255, 45, 149, 0.6); }
}

.menu-actions { display: flex; gap: 8px; margin-top: 10px; }
.menu-actions .btn { flex: 1; }

.foot {
  flex: 0 0 auto;
  padding-top: 12px;
  text-align: center;
  color: var(--dim);
  font-size: 12px;
}

/* ---------------------------------------------------------------- modals */

.modal-panel {
  width: min(560px, 100%);
  max-height: min(86vh, 720px);
  overflow-y: auto;
}
.modal-panel.narrow { width: min(360px, 100%); text-align: center; }

.prose { font-size: 14px; line-height: 1.65; color: #c9c3e8; }
.prose ul { margin: 10px 0; padding-left: 20px; }
.prose li { margin-bottom: 7px; }
.prose .dim { color: var(--dim); font-size: 13px; }

.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
.modal-actions.stack { flex-direction: column; }
.modal-actions.stack .btn { width: 100%; }

.setting { margin-bottom: 18px; }
.setting label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.setting output { color: var(--cyan); font: 700 14px/1 var(--mono); }
.setting .hint { margin: 6px 0 8px; color: var(--dim); font-size: 12px; }

input[type="range"] {
  width: 100%;
  height: 22px;
  margin: 0;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 5px; border-radius: 3px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}
input[type="range"]::-moz-range-track {
  height: 5px; border-radius: 3px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 17px; height: 17px; margin-top: -6px;
  border: 0; border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 10px var(--cyan);
}
input[type="range"]::-moz-range-thumb {
  width: 17px; height: 17px; border: 0; border-radius: 50%;
  background: #fff; box-shadow: 0 0 10px var(--cyan);
}
input[type="range"]:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }

.toggles { display: flex; flex-wrap: wrap; gap: 14px; }
.switch { display: flex; align-items: center; gap: 8px; font-size: 13px; cursor: pointer; }
.switch input { width: 17px; height: 17px; accent-color: var(--pink); cursor: pointer; }

/* ---------------------------------------------------------------- calibrate */

.calibrate { text-align: center; }
.cal-beat {
  display: grid;
  place-items: center;
  width: min(220px, 60vw);
  aspect-ratio: 1;
  margin: 18px auto;
  border: 2px solid var(--line-2);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  font: 700 20px/1 var(--font);
  letter-spacing: 0.3em;
  color: var(--dim);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  transition: transform 90ms, background 90ms, border-color 90ms, color 90ms;
}
.cal-beat.pulse {
  transform: scale(1.06);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.16);
  color: var(--text);
}
.cal-readout { min-height: 46px; font: 700 15px/1.5 var(--mono); color: var(--cyan); }

/* ---------------------------------------------------------------- result */

.result-panel { width: min(540px, 100%); margin: auto; text-align: center; }
.result-song { margin: 0 0 14px; color: var(--dim); font-size: 14px; letter-spacing: 0.06em; }

.result-grade {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 4vw, 34px);
  margin-bottom: 18px;
}
.grade-letter {
  font-size: clamp(72px, 16vw, 128px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--gcolor, var(--amber));
  text-shadow: 0 0 40px var(--gcolor, var(--amber));
}
.result-headline { text-align: left; }
.result-score { font: 800 clamp(28px, 6vw, 42px)/1 var(--mono); letter-spacing: -0.01em; }
.result-acc { margin-top: 4px; color: var(--dim); font: 600 16px/1 var(--mono); }
.result-badge {
  display: inline-block;
  margin-top: 9px;
  padding: 4px 10px;
  border-radius: 999px;
  background: linear-gradient(96deg, var(--amber), var(--pink));
  color: #17081e;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.17em;
}

.result-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.result-table th {
  padding: 8px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: left;
  color: var(--dim);
}
.result-table td {
  padding: 8px 10px;
  font: 700 17px/1 var(--mono);
  text-align: right;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.result-record {
  margin: 16px 0 0;
  color: var(--amber);
  font-weight: 800;
  letter-spacing: 0.3em;
  text-shadow: 0 0 20px rgba(255, 209, 102, 0.6);
}

.j-perfect { color: var(--cyan) !important; }
.j-great   { color: var(--lime) !important; }
.j-good    { color: var(--amber) !important; }
.j-miss    { color: var(--red)  !important; }

/* ---------------------------------------------------------------- narrow */

@media (max-width: 780px) {
  .menu-body { grid-template-columns: minmax(0, 1fr); }
  .songlist { max-height: 34vh; }
  .btn-play { margin-top: 6px; }
  .foot { display: none; }
}

@media (max-height: 520px) {
  .logo { font-size: clamp(26px, 6vw, 40px); margin: 0 0 2px; }
  .tagline { display: none; }
}