*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-deep: #001a4d;
  --bg: #0033cc;
  --bg-mid: #1e5bff;
  --accent-light: #4da6ff;
  --accent-orange: #ff6a1e;
  --fg: #ffffff;
  --fg-dim: rgba(255, 255, 255, 0.55);
  --fg-faint: rgba(255, 255, 255, 0.2);
  --sans: 'Space Grotesk', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

html, body {
  width: 100%;
  height: 100%;
  background: var(--bg-deep);
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 300;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

#webgl {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 1;
}

button {
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

/* ================================
   INTRO
================================ */
.intro {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--accent-orange);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  transition: opacity 1s ease;
}

.intro.hidden {
  opacity: 0;
  pointer-events: none;
}

.intro__grid {
  position: absolute;
  inset: 2rem;
  pointer-events: none;
}

.intro__corner {
  position: absolute;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--fg-dim);
}

.intro__corner--tl { top: 0; left: 0; }
.intro__corner--tr { top: 0; right: 0; }
.intro__corner--bl { bottom: 0; left: 0; }
.intro__corner--br { bottom: 0; right: 0; }

.intro__title {
  font-size: clamp(4rem, 15vw, 10rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.9;
  text-align: center;
  margin-bottom: 1rem;
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.intro__sub {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--bg-deep);
  margin-bottom: 4rem;
  text-transform: uppercase;
}

.intro__enter {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 3rem;
  background: transparent;
  border: 1px solid var(--bg-deep);
  color: var(--bg-deep);
  font-family: var(--mono);
  font-size: 0.9rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.intro__enter::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bg-deep);
  transform: translateX(-100%);
  transition: transform 0.4s ease;
  z-index: -1;
}

.intro__enter:hover {
  color: var(--accent-orange);
}

.intro__enter:hover::before {
  transform: translateX(0);
}

.intro__enter:hover .intro__enter-arrow {
  transform: translateX(8px);
}

.intro__enter-arrow {
  transition: transform 0.4s ease;
  font-size: 1.2rem;
}

.intro__note {
  margin-top: 3rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-light);
  background-color: var(--bg-deep);
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  text-transform: uppercase;
}

/* ================================
   UI
================================ */
.ui {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1s ease 0.5s;
}

.ui.active {
  opacity: 1;
}

.ui-top,
.ui-bottom,
.tracklist {
  pointer-events: auto;
}

/* HEADER */
.ui-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 2rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  mix-blend-mode: screen;
}

.ui-top__left {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-family: var(--mono);
}

.ui-top__label {
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-right: 0.5rem;
}

.ui-top__num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-orange);
  font-variant-numeric: tabular-nums;
}

.ui-top__total {
  font-size: 1rem;
  color: var(--fg-dim);
}

.ui-top__info-right {
  text-align: right;
}

.ui-top__name {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
  color: var(--accent-orange);
}

.ui-top__mood {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--accent-orange);
  text-transform: uppercase;
  opacity: 0.8;
}

.ui-top__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.ui-top__levels {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.level {
  width: 60px;
  height: 4px;
  background: var(--fg-faint);
  position: relative;
  overflow: hidden;
}

.level::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.08s ease-out;
}

.level::after {
  content: attr(data-label);
  position: absolute;
  right: 70px;
  top: -4px;
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
}

/* CONTROLES INFERIORES */
.ui-bottom {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(0, 26, 77, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid var(--fg-faint);
  border-radius: 40px;
}

.ctrl {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg);
  transition: all 0.3s ease;
}

.ctrl:hover {
  color: var(--accent-orange);
  transform: scale(1.1);
}

.ctrl--play {
  width: 56px;
  height: 56px;
  background: var(--accent-orange);
  color: var(--bg-deep);
}

.ctrl--play:hover {
  background: var(--accent-light);
  color: var(--bg-deep);
}

.progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 320px;
}

.progress__time {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--fg-dim);
  font-variant-numeric: tabular-nums;
  min-width: 2.5rem;
}

.progress__bar {
  flex: 1;
  height: 2px;
  background: var(--fg-faint);
  position: relative;
  cursor: pointer;
}

.progress__fill {
  height: 100%;
  width: 0%;
  background: var(--accent-orange);
  transition: width 0.1s linear;
}

.progress__handle {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-orange);
  transform: translate(-50%, -50%);
  transition: left 0.1s linear;
}

/* TRACKLIST LATERAL */
.tracklist {
  position: absolute;
  right: 2.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tracklist__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--mono);
  opacity: 0.5;
}

.tracklist__item:hover,
.tracklist__item.active {
  opacity: 1;
}

.tracklist__line {
  width: 30px;
  height: 1px;
  background: var(--fg-dim);
  transition: all 0.3s ease;
}

.tracklist__item:hover .tracklist__line,
.tracklist__item.active .tracklist__line {
  width: 60px;
  background: var(--accent-orange);
}

.tracklist__num {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
}

.tracklist__item.active .tracklist__num {
  color: var(--accent-orange);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .ui-top {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
  }
  .ui-top__right {
    align-self: flex-start;
  }
  .tracklist {
    display: none;
  }
  .ui-bottom {
    bottom: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  .progress {
    min-width: 100%;
    order: -1;
  }
  .intro__title {
    font-size: clamp(3rem, 18vw, 7rem);
  }
}