/* styles.css — neon glass UI for Echo Runner: Chromatic Descent.
   The accent color is set per-level from JS via --accent custom properties. */

:root {
  --accent: hsl(195 90% 62%);
  --accent-soft: hsla(195, 90%, 62%, 0.35);
  --accent-faint: hsla(195, 90%, 62%, 0.12);
  --ink: #dfe7ff;
  --ink-dim: #8e9bc4;
  --panel-bg: linear-gradient(165deg, rgba(14, 20, 40, 0.84), rgba(8, 11, 24, 0.88));
  --panel-border: rgba(130, 180, 255, 0.16);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #070a16;
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-user-select: none;
  user-select: none;
}

#app { position: fixed; inset: 0; }

#bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0; /* the shader sky — rendered at half res, upscaled here */
}

#game-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

.hidden { display: none !important; }

/* ---------------------------------------------------------------- screens */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.985);
  transition: opacity 0.32s ease, transform 0.32s ease;
  z-index: 10;
  padding: 20px;
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.screen.overlay {
  background: rgba(4, 6, 14, 0.55);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
  z-index: 20;
}

/* settings docks right and never dims — tune the visualizer while it plays */
#screen-settings.overlay {
  background: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  flex-direction: row;
  justify-content: flex-end;
  align-items: center;
  padding: 14px;
}

#screen-settings .panel {
  width: min(450px, 94vw);
  max-height: 96vh;
  margin: 0;
}

#screen-settings .set-grid {
  grid-template-columns: 128px 1fr;
  gap: 10px 14px;
}

#screen-settings .set-grid > label {
  font-size: 10px;
  letter-spacing: 0.18em;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 30px 42px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55), inset 0 0 50px rgba(90, 150, 255, 0.045);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  max-width: 880px;
  max-height: 88vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.panel.narrow { min-width: min(420px, 92vw); }

.screen-title {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0.45em;
  font-weight: 700;
  color: var(--ink);
  text-shadow: 0 0 22px var(--accent-soft);
  text-align: center;
}

/* ---------------------------------------------------------------- title */
.title-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  animation: floaty 7s ease-in-out infinite;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

.title-kicker {
  letter-spacing: 0.5em;
  font-size: 11px;
  color: var(--ink-dim);
}

.logo {
  margin: 0;
  font-size: clamp(56px, 11vw, 118px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: 0.1em;
  text-align: center;
  background: linear-gradient(100deg, #6ef2ff 5%, #7c8cff 35%, #e86bff 65%, #6ef2ff 95%);
  background-size: 250% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 26px rgba(110, 200, 255, 0.35));
  animation: logoflow 9s linear infinite;
}

.logo span { display: block; letter-spacing: 0.32em; }

@keyframes logoflow {
  from { background-position: 0% 0; }
  to { background-position: 250% 0; }
}

.title-sub {
  letter-spacing: 0.72em;
  font-size: 13px;
  color: var(--accent);
  text-shadow: 0 0 16px var(--accent-soft);
  margin-bottom: 10px;
}

.title-foot {
  margin-top: 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
}

.title-audio {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.seg-label { font-size: 11px; letter-spacing: 0.35em; color: var(--ink-dim); }

/* ---------------------------------------------------------------- buttons */
.menu-buttons { display: flex; flex-direction: column; gap: 12px; align-items: stretch; min-width: 250px; }

.btn {
  appearance: none;
  background: rgba(16, 24, 48, 0.5);
  border: 1px solid var(--accent-soft);
  border-radius: 11px;
  color: var(--ink);
  font: 600 14px/1 "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  padding: 14px 30px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.btn:hover, .btn:focus-visible {
  background: var(--accent-faint);
  box-shadow: 0 0 26px var(--accent-faint), 0 0 8px var(--accent-soft) inset;
  transform: translateY(-1px);
  outline: none;
  border-color: var(--accent);
}

.btn:active { transform: translateY(0); }

.btn.primary {
  background: var(--accent-faint);
  border-color: var(--accent);
  box-shadow: 0 0 22px var(--accent-faint);
}

.btn.ghost { border-color: rgba(130, 160, 220, 0.25); background: transparent; }
.btn.small { padding: 9px 16px; font-size: 11px; letter-spacing: 0.18em; }
.btn.danger { border-color: rgba(255, 90, 120, 0.5); }
.btn.danger:hover { background: rgba(255, 90, 120, 0.12); box-shadow: 0 0 22px rgba(255, 90, 120, 0.25); border-color: rgb(255, 110, 130); }

.row { display: flex; align-items: center; gap: 12px; }
.row-center { display: flex; justify-content: center; align-items: center; }
.row-center.gap { gap: 12px; }
.dim { color: var(--ink-dim); font-size: 12px; letter-spacing: 0.08em; max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* segments */
.seg { display: inline-flex; border: 1px solid rgba(130, 160, 220, 0.25); border-radius: 10px; overflow: hidden; }

.seg button {
  appearance: none;
  background: transparent;
  border: none;
  border-right: 1px solid rgba(130, 160, 220, 0.18);
  color: var(--ink-dim);
  font: 600 11px/1 "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0.18em;
  padding: 9px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.seg button:last-child { border-right: none; }
.seg button:hover { color: var(--ink); background: rgba(130, 160, 220, 0.08); }
.seg button.on {
  color: #0a0f20;
  background: var(--accent);
  text-shadow: none;
  box-shadow: 0 0 18px var(--accent-soft);
}

/* ---------------------------------------------------------------- settings */
.set-grid {
  display: grid;
  grid-template-columns: 200px minmax(220px, 1fr);
  gap: 14px 22px;
  align-items: center;
  width: 100%;
}

.set-grid > label {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
  text-align: right;
}

input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 3px;
  background: rgba(130, 160, 220, 0.25);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-soft);
  border: 2px solid #0a0f20;
}

input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-soft);
  border: 2px solid #0a0f20;
}

input[type="checkbox"] {
  width: 19px; height: 19px;
  accent-color: var(--accent);
  cursor: pointer;
  justify-self: start;
}

.set-section {
  grid-column: 1 / -1;
  margin-top: 10px;
  padding-bottom: 6px;
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-faint);
}

/* ---------------------------------------------------------------- help */
.help-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 40px; width: 100%; }
.help-cols h3 { font-size: 13px; letter-spacing: 0.3em; color: var(--accent); margin: 6px 0; }

.keys { border-collapse: collapse; font-size: 13px; }
.keys td { padding: 5px 14px 5px 0; color: var(--ink-dim); }
.keys td:first-child {
  color: var(--ink);
  font-family: Consolas, ui-monospace, monospace;
  font-size: 12px;
  white-space: nowrap;
}

.rules { margin: 0; padding-left: 18px; font-size: 13px; line-height: 1.75; color: var(--ink-dim); }
.rules b { color: var(--ink); }

/* ---------------------------------------------------------------- levels */
#level-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 280px));
  gap: 18px;
  justify-content: center;
  width: min(1000px, 94vw);
}

.card {
  appearance: none;
  text-align: left;
  position: relative;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 22px 22px 18px;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.2s ease;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card:hover:not(.locked) {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.4), 0 0 30px var(--accent-faint);
}

.card-num { font-size: 12px; letter-spacing: 0.4em; color: var(--accent); margin-bottom: 8px; }
.card-name { font-size: 19px; font-weight: 700; letter-spacing: 0.14em; margin-bottom: 6px; }
.card-sub { font-size: 11px; letter-spacing: 0.12em; color: var(--ink-dim); margin-bottom: 16px; min-height: 26px; }
.card-stats { display: flex; gap: 16px; font-size: 11px; letter-spacing: 0.1em; color: var(--ink-dim); }
.card-stats b { color: var(--ink); font-family: Consolas, ui-monospace, monospace; }

.card.locked { cursor: default; filter: grayscale(0.8) brightness(0.6); }
.card-lock {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(5, 7, 16, 0.55);
  font-size: 10px; letter-spacing: 0.3em; color: var(--ink-dim);
  text-align: center; padding: 10px;
}

.card-perfect {
  position: absolute; top: 14px; right: -34px;
  transform: rotate(38deg);
  background: linear-gradient(90deg, #ffd34e, #ff9d2e);
  color: #2a1a00;
  font-size: 9px; font-weight: 800; letter-spacing: 0.18em;
  padding: 4px 38px;
}

/* ---------------------------------------------------------------- complete */
.complete-kicker { font-size: 11px; letter-spacing: 0.5em; color: var(--accent); }

.best-badge {
  font-size: 12px; letter-spacing: 0.3em;
  color: #ffd34e;
  text-shadow: 0 0 18px rgba(255, 211, 78, 0.5);
  animation: bestPulse 1.4s ease-in-out infinite;
}

@keyframes bestPulse {
  0%, 100% { opacity: 0.75; }
  50% { opacity: 1; }
}

.stats-grid { display: flex; gap: 38px; margin: 8px 0 6px; }
.stats-grid > div { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.stat-label { font-size: 10px; letter-spacing: 0.34em; color: var(--ink-dim); }
.stat-val { font-size: 26px; font-weight: 700; font-family: Consolas, ui-monospace, monospace; color: var(--ink); text-shadow: 0 0 18px var(--accent-soft); }

/* ---------------------------------------------------------------- HUD */
#hud { position: absolute; inset: 0; pointer-events: none; z-index: 5; }

.hud-corner { position: absolute; display: flex; align-items: center; gap: 14px; }

.glass {
  background: rgba(8, 12, 26, 0.5);
  border: 1px solid rgba(130, 170, 255, 0.14);
  border-radius: 12px;
  padding: 10px 16px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hud-tl { top: 16px; left: 16px; }
.hud-tr { top: 16px; right: 16px; }
.hud-bl { bottom: 16px; left: 16px; }
.hud-br { bottom: 16px; right: 16px; font-size: 10px; letter-spacing: 0.22em; color: rgba(160, 175, 215, 0.5); }

#hud-level { font-size: 12px; letter-spacing: 0.3em; color: var(--accent); }
#hud-timer, #hud-shards, #hud-deaths {
  font-family: Consolas, ui-monospace, monospace;
  font-size: 16px;
  font-variant-numeric: tabular-nums;
}

#hud-shards { color: #ffd95e; transition: transform 0.15s ease; }
#hud-shards.bump { animation: bump 0.3s ease; }

@keyframes bump {
  0% { transform: scale(1); }
  40% { transform: scale(1.35); }
  100% { transform: scale(1); }
}

#hud-deaths { color: #ff7d9c; }

#meter { display: flex; align-items: flex-end; gap: 4px; height: 30px; }
#meter i {
  display: block;
  width: 7px; height: 30px;
  border-radius: 3px;
  background: linear-gradient(to top, var(--accent), #fff);
  transform-origin: bottom;
  transform: scaleY(0.05);
  opacity: 0.9;
}

#beat-dot {
  width: 13px; height: 13px;
  border-radius: 50%;
  border: 2px solid var(--accent-soft);
  transition: all 0.08s ease;
}

#beat-dot.on {
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
  transform: scale(1.2);
}

#hud-mode { font-size: 10px; letter-spacing: 0.26em; color: var(--ink-dim); }

/* ---------------------------------------------------------------- banner */
#level-banner {
  position: absolute;
  top: 17%;
  left: 0; right: 0;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  z-index: 6;
}

#level-banner h2 {
  margin: 0;
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: 0.35em;
  color: var(--ink);
  text-shadow: 0 0 34px var(--accent-soft), 0 0 8px var(--accent-soft);
}

#level-banner p { margin: 8px 0 0; font-size: 12px; letter-spacing: 0.45em; color: var(--ink-dim); }

#level-banner.show { animation: banner 2.6s ease forwards; }

@keyframes banner {
  0% { opacity: 0; transform: translateY(16px) scale(0.98); }
  12% { opacity: 1; transform: none; }
  78% { opacity: 1; }
  100% { opacity: 0; transform: translateY(-10px); }
}

/* ---------------------------------------------------------------- toasts */
#toasts {
  position: absolute;
  bottom: 72px;
  left: 0; right: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  z-index: 30;
}

.toast {
  background: rgba(10, 14, 30, 0.78);
  border: 1px solid var(--accent-soft);
  border-radius: 999px;
  padding: 9px 22px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--ink);
  box-shadow: 0 0 24px var(--accent-faint);
  backdrop-filter: blur(8px);
  animation: toastIn 0.3s ease;
}

.toast.out { opacity: 0; transform: translateY(8px); transition: all 0.35s ease; }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------------- touch */
#touch-ui { position: absolute; inset: 0; pointer-events: none; z-index: 8; }

.t-left { position: absolute; bottom: 26px; left: 20px; display: flex; gap: 14px; }
.t-right { position: absolute; bottom: 26px; right: 20px; display: flex; gap: 14px; align-items: center; }

.t-btn {
  pointer-events: auto;
  appearance: none;
  width: 64px; height: 64px;
  border-radius: 50%;
  border: 1.5px solid var(--accent-soft);
  background: rgba(12, 18, 38, 0.45);
  color: var(--ink);
  font-size: 20px;
  touch-action: none;
  backdrop-filter: blur(6px);
  transition: background 0.1s ease;
}

.t-btn.big { width: 80px; height: 80px; font-size: 26px; }
.t-btn.held { background: var(--accent-faint); box-shadow: 0 0 22px var(--accent-faint); }
.t-pause { position: absolute; top: 70px; right: 20px; width: 46px; height: 46px; font-size: 13px; }

/* ---------------------------------------------------------------- misc */
.panel::-webkit-scrollbar { width: 8px; }
.panel::-webkit-scrollbar-thumb { background: rgba(130, 160, 220, 0.25); border-radius: 4px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 760px) {
  .panel { padding: 22px 20px; }
  .set-grid { grid-template-columns: 1fr; gap: 6px; }
  .set-grid > label { text-align: left; margin-top: 8px; }
  .help-cols { grid-template-columns: 1fr; }
  .stats-grid { gap: 22px; }
  .stat-val { font-size: 20px; }
  .hud-br { display: none; }
  .screen-title { font-size: 19px; letter-spacing: 0.3em; }
}

@media (prefers-reduced-motion: reduce) {
  .title-wrap { animation: none; }
  .logo { animation: none; }
}