/* ---------------------------------------------------------------
   Music section — gate, library, and alphaTab player.
   Shares the black / white language of the landing page.
----------------------------------------------------------------- */

:root {
  --black: #0d0d0d;
  --white: #ffffff;
  --grey: #6b6b6b;
  --line: rgba(0, 0, 0, 0.12);
  --bg-soft: #f5f5f4;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--black);
  background: var(--white);
}

/* ---- Shared header ---------------------------------------------- */

.music-header,
.player-bar {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.1rem clamp(1.2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.music-back {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--black);
  white-space: nowrap;
}

.music-back:hover {
  opacity: 0.6;
}

.link-btn {
  margin-left: auto;
  background: none;
  border: none;
  font: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
  cursor: pointer;
}

.link-btn:hover {
  color: var(--black);
}

/* ---- Gate + library --------------------------------------------- */

.music-main {
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(3rem, 12vh, 8rem) clamp(1.4rem, 5vw, 2rem);
}

.music-title {
  font-weight: 400;
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  letter-spacing: -0.01em;
  margin-bottom: 1.2rem;
}

.gate__hint {
  color: var(--grey);
  font-size: 0.95rem;
  margin-bottom: 1.6rem;
}

.gate__form {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.gate__input {
  flex: 1 1 220px;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  font: inherit;
  background: var(--white);
}

.gate__input:focus {
  outline: none;
  border-color: var(--black);
}

.gate__error {
  margin-top: 1rem;
  color: #b00020;
  font-size: 0.9rem;
}

.btn {
  padding: 0.75rem 1.4rem;
  border: 1px solid var(--black);
  border-radius: 2px;
  background: var(--black);
  color: var(--white);
  font: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: opacity 0.2s var(--ease);
}

.btn:hover:not(:disabled) {
  opacity: 0.78;
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn--small {
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
}

.btn--icon {
  width: 2.6rem;
  padding: 0.5rem 0;
  text-align: center;
}

/* ---- Track list ------------------------------------------------- */

.track-list {
  list-style: none;
}

.track-list__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0.3rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--black);
  transition: padding-left 0.25s var(--ease);
}

.track-list__link:hover {
  padding-left: 1rem;
  background: var(--bg-soft);
}

.track-list__title {
  font-size: 1.1rem;
}

.track-list__cue {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
}

.library__empty {
  color: var(--grey);
}

/* ---- Player ----------------------------------------------------- */

.player-body {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.player-bar {
  flex-wrap: wrap;
}

.player-title {
  font-size: 1rem;
  font-weight: 500;
  margin-right: auto;
}

.transport {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.ctrl {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.ctrl--check {
  cursor: pointer;
}

.ctrl__num {
  width: 4.2rem;
  padding: 0.35rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  font: inherit;
}

.ctrl__unit {
  font-size: 0.7rem;
}

/* ---- Player layout: parts sidebar + scrollable score ------------ */

.player-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 0;
}

.parts {
  border-right: 1px solid var(--line);
  padding: 1.4rem 1.2rem;
  overflow-y: auto;
  background: var(--bg-soft);
}

.parts__title {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 1rem;
}

.parts__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.parts__vol-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.5rem;
  margin: 0.35rem 0 0 1.4rem;
}

.parts__vol {
  width: 100%;
  accent-color: var(--black);
  cursor: pointer;
}

.parts__vol-pct {
  font-size: 0.72rem;
  color: var(--grey);
  font-variant-numeric: tabular-nums;
  min-width: 2.6rem;
  text-align: right;
}

.parts__item label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.parts__swatch {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 3px;
  flex: 0 0 auto;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.15);
}

.parts__hint {
  margin-top: 1.6rem;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--grey);
}

.viewport {
  position: relative;
  overflow-y: auto;
  background: #fafafa;
  padding: clamp(1rem, 3vw, 2.5rem);
}

#alphatab {
  background: var(--white);
}

/* ---- Loading indicator ------------------------------------------ */

.loader {
  position: absolute;
  top: 1.4rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1rem 1.3rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
  font-size: 0.85rem;
  transition: opacity 0.5s var(--ease), visibility 0.5s var(--ease);
}

.loader--hidden {
  opacity: 0;
  visibility: hidden;
}

.loader__row {
  display: grid;
  grid-template-columns: 1.1rem 1fr auto;
  align-items: center;
  gap: 0.6rem;
  color: var(--grey);
}

.loader__icon {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  border: 1.5px solid #cfcfcf;
}

.loader__row.is-active .loader__icon {
  border-color: var(--black);
  border-top-color: transparent;
  animation: loader-spin 0.7s linear infinite;
}

.loader__row.is-done {
  color: var(--black);
}

.loader__row.is-done .loader__icon {
  border-color: #1a7f37;
  background: #1a7f37;
}

.loader__row.is-error {
  color: #b00020;
}

.loader__row.is-error .loader__icon {
  border-color: #b00020;
  background: #b00020;
}

.loader__detail {
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
}

@keyframes loader-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- alphaTab cursors / highlighting ---------------------------- */

/* The bar currently under the play cursor (also where a click lands). */
.at-cursor-bar {
  background: rgba(176, 0, 32, 0.10);
}

/* The thin marker on the current beat. */
.at-cursor-beat {
  background: rgba(176, 0, 32, 0.8);
  width: 2px;
}

/* A click-drag selection range. */
.at-selection div {
  background: rgba(13, 13, 13, 0.10);
}

/* ---- Responsive ------------------------------------------------- */

@media (max-width: 760px) {
  .player-layout {
    grid-template-columns: 1fr;
  }

  .parts {
    border-right: none;
    border-bottom: 1px solid var(--line);
    max-height: 30vh;
  }
}