/* ==========================================================================
   moodwave — styles
   ========================================================================== */

:root {
  /* Colors (--accent / --accent-2 are updated by main.js to match the mood) */
  --bg: #07070d;
  --text: #f4f3ff;
  --text-dim: rgba(244, 243, 255, 0.68);
  --text-on-accent: #0b0b14;
  --glass: rgba(16, 14, 28, 0.5);
  --glass-hover: rgba(255, 255, 255, 0.12);
  --glass-chip: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
  --track: rgba(255, 255, 255, 0.18);
  --accent: #7fb3ff;
  --accent-2: #a99cff;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 40px;

  /* Shape & motion */
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --tap: 44px;
  --ease: cubic-bezier(0.22, 0.8, 0.24, 1);

  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: ui-rounded, "SF Pro Rounded", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body {
  overscroll-behavior: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---- Canvas ------------------------------------------------------------- */

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* taps go to the canvas instead of scrolling/zooming */
}

/* Soft vignette for depth (not part of screenshots). */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, 0.45));
}

/* Screenshot flash. */
body.flash::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  background: #fff;
  animation: flash 0.45s ease-out forwards;
}

/* ---- Welcome screen ----------------------------------------------------- */

.welcome {
  position: fixed;
  inset: 0;
  z-index: 3;
  display: grid;
  place-items: center;
  padding: var(--space-5) var(--space-4);
  background: radial-gradient(circle at 50% 40%, rgba(7, 7, 13, 0.2), rgba(7, 7, 13, 0.75));
  transition: opacity 0.8s var(--ease), visibility 0.8s;
}

.welcome.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.welcome__card {
  width: min(560px, 100%);
  padding: var(--space-6) var(--space-5);
  text-align: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  animation: rise 0.9s var(--ease) both;
}

.brand {
  margin: 0;
  font-size: clamp(2.6rem, 10vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  background: linear-gradient(100deg, var(--accent), var(--accent-2), var(--accent));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 6s linear infinite;
}

.welcome__lead {
  margin: var(--space-2) 0 var(--space-5);
  font-size: 1.25rem;
  color: var(--text-dim);
}

.btn-start {
  min-height: 52px;
  margin-top: var(--space-5);
  padding: 0 var(--space-6);
  border: 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--text-on-accent);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 30px -8px var(--accent);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.6s;
}

.welcome__hint {
  margin: var(--space-4) 0 0;
  font-size: 0.85rem;
  color: var(--text-dim);
}

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

.mood-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.mood-btn {
  /* Palette colors; main.js overrides these per button. */
  --c1: var(--accent);
  --c2: var(--accent-2);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap);
  padding: 0 18px;
  flex-shrink: 0;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-chip);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s, transform 0.2s var(--ease);
}

/* Color dot previewing the mood's palette. */
.mood-btn::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  box-shadow: 0 0 8px var(--c1);
}

.mood-btn[aria-pressed="true"] {
  border-color: transparent;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: var(--text-on-accent);
  box-shadow: 0 0 24px -4px var(--c1);
}

.mood-btn[aria-pressed="true"]::before {
  background: var(--text-on-accent);
  box-shadow: none;
}

/* ---- Control bar -------------------------------------------------------- */

.controls {
  position: fixed;
  left: 50%;
  bottom: max(var(--space-4), env(safe-area-inset-bottom));
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  width: max-content;
  max-width: calc(100% - 2 * var(--space-4));
  padding: var(--space-3) var(--space-4);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  transform: translateX(-50%);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  animation: fade-in 0.8s var(--ease) both;
}

.controls__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  background: var(--glass-chip);
  transition: background 0.25s, transform 0.2s var(--ease);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.icon-btn--primary {
  width: 52px;
  height: 52px;
  border: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--text-on-accent);
  box-shadow: 0 6px 20px -6px var(--accent);
}

.icon-btn--primary svg {
  width: 24px;
  height: 24px;
}

/* Icon swaps driven by data attributes set in main.js. */
#play-btn[data-playing="true"] .icon-play,
#play-btn[data-playing="false"] .icon-pause,
#fullscreen-btn[data-active="true"] .icon-expand,
#fullscreen-btn[data-active="false"] .icon-shrink {
  display: none;
}

/* ---- Sliders ------------------------------------------------------------ */

.slider {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.slider input {
  width: 110px;
}

input[type="range"] {
  --fill: 50%;
  height: var(--tap);
  margin: 0;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(to right, var(--accent) var(--fill), var(--track) var(--fill));
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(to right, var(--accent) var(--fill), var(--track) var(--fill));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.12), 0 0 14px var(--accent);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.12), 0 0 14px var(--accent);
}

/* ---- Welcome: your own music ------------------------------------------ */

.welcome__alt {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.btn-ghost {
  min-height: 36px;
  padding: 0 var(--space-4);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-chip);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.25s, transform 0.2s var(--ease);
}

.welcome__status:empty,
.settings__status:empty {
  display: none;
}

.welcome__status,
.settings__status {
  margin: var(--space-3) 0 0;
  font-size: 0.8rem;
  color: var(--accent);
}

/* ---- Settings panel ----------------------------------------------------- */

.settings {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--glass-border);
  animation: fade-in 0.3s var(--ease) both;
}

.settings__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.settings__label {
  padding: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.segmented {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-chip);
}

.segmented button {
  min-height: 36px;
  padding: 0 var(--space-4);
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  transition: background 0.25s, color 0.25s;
}

.segmented button[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--text-on-accent);
}

.settings__tuning {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  transition: opacity 0.3s;
}

.settings__tuning:disabled {
  opacity: 0.4;
}

.settings__tuning legend {
  float: left; /* lets the legend sit inline with the fields */
}

.settings__field {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.settings__field output {
  display: inline-block;
  min-width: 4.5em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.settings__field input[type="range"] {
  width: 140px;
}

.settings__field select {
  min-height: 36px;
  padding: 0 var(--space-3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: var(--glass-chip);
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
}

.settings__field select option {
  background: var(--bg);
}

.btn-text {
  min-height: 36px;
  padding: 0 var(--space-2);
  border: 0;
  background: none;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 3px;
}

#settings-btn[aria-expanded="true"] {
  background: var(--glass-hover);
  border-color: var(--accent);
}

/* ---- Idle: hide UI and cursor while just watching ------------------------ */

body.idle {
  cursor: none;
}

body.idle .controls {
  opacity: 0;
  transform: translate(-50%, 24px);
  pointer-events: none;
}

/* ---- Hover (pointer devices only, so taps don't stick) ------------------- */

@media (hover: hover) {
  .mood-btn:hover:not([aria-pressed="true"]),
  .icon-btn:not(.icon-btn--primary):hover,
  .btn-ghost:hover,
  .segmented button:hover:not([aria-pressed="true"]) {
    background: var(--glass-hover);
  }

  .mood-btn:hover,
  .icon-btn:hover {
    transform: translateY(-1px);
  }

  .btn-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 40px -8px var(--accent);
  }
}

.mood-btn:active,
.icon-btn:active,
.btn-start:active {
  transform: scale(0.96);
}

/* ---- Mobile ------------------------------------------------------------- */

@media (max-width: 640px) {
  .welcome__card {
    padding: var(--space-5) var(--space-4);
  }

  .controls {
    left: var(--space-2);
    right: var(--space-2);
    bottom: max(var(--space-2), env(safe-area-inset-bottom));
    width: auto;
    max-width: none;
    padding: var(--space-3);
    border-radius: var(--radius);
    transform: none;
  }

  body.idle .controls {
    transform: translateY(24px);
  }

  /* Mood chips scroll sideways instead of wrapping onto many lines. */
  .controls .mood-list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .controls .mood-list::-webkit-scrollbar {
    display: none;
  }

  .controls__row {
    gap: var(--space-2);
  }

  .slider span {
    display: none;
  }

  .settings__field input[type="range"] {
    width: min(140px, 36vw);
  }

  .slider input {
    width: min(110px, 24vw);
  }
}

/* ---- Misc --------------------------------------------------------------- */

.noscript {
  position: fixed;
  inset: auto 0 var(--space-6);
  z-index: 5;
  text-align: center;
}

@keyframes shimmer {
  to { background-position: 200% center; }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
}

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

@keyframes flash {
  from { opacity: 0.6; }
  to { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}