/* Brain Shift web player — styled per DESIGN.md (Sound-a-tude system).
   Warm dawn paper canvas · focused dark listening stage · tactile controls. */

:root {
  --bg: #F7F1E7;            /* warm dawn paper canvas */
  --surface: #FFFDFC;       /* soft white paper */
  --ink: #182532;           /* deep blue-black */
  --muted: #61717C;         /* slate */
  --sky: #8ECDE6;           /* optimistic blue */
  --sky-strong: #2E7FA3;    /* commerce / primary actions (sky family, deeper) */
  --coral: #F06C5B;         /* focused playback emphasis */
  --leaf: #68A67A;          /* active / selected / success */
  --sun: #F4C95D;           /* momentary emphasis */
  --stage: #0D1722;         /* sound stage deep navy */
  --line: rgba(24, 37, 50, 0.16);
  --line-strong: rgba(24, 37, 50, 0.28);
  --shadow: 0 10px 30px rgba(13, 23, 34, 0.16), 0 2px 6px rgba(13, 23, 34, 0.08);
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(247, 241, 231, 0.82), rgba(247, 241, 231, 0.9)),
    url("assets/marketing/soundatude-adult-sonic-backdrop-v001.jpg"),
    url("assets/marketing/soundatude-adult-paper-texture-v001.jpg");
  background-size: cover, 900px auto, 480px auto;
  background-position: center, center top, center;
  background-attachment: fixed, fixed, fixed;
  min-height: 100vh;
  padding-bottom: 96px; /* room for bottom nav */
}

/* ---------- shared ---------- */
:focus-visible { outline: 2px solid var(--sky-strong); outline-offset: 2px; border-radius: 6px; }
h1 { font-size: 1.5rem; margin: 0 0 4px; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 22px 0 10px; }
a { color: var(--sky-strong); }

.btn {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1.5px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  font: 600 0.95rem var(--font);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 160ms ease, transform 160ms ease, border-color 160ms ease;
}
.btn:hover { background: #f4ead9; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--sky-strong); border-color: var(--sky-strong); color: #fff; }
.btn.primary:hover { background: #276e8d; }
.btn.ghost { background: transparent; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px;
  background: rgba(247, 241, 231, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.brand-link { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--stage); color: var(--sky); }
.brand-name { font-weight: 800; font-size: 1.06rem; letter-spacing: 0.01em; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.account-box { font-size: 0.86rem; color: var(--muted); max-width: 220px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap; }

/* ---------- layout ---------- */
.app-main { max-width: 880px; margin: 0 auto; padding: 18px 18px 30px; }
.view { animation: viewIn 180ms ease; }
@keyframes viewIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- sound stage ---------- */
.sound-stage {
  position: relative;
  background: var(--stage);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 26px 22px;
  color: #EAF3F8;
  overflow: hidden;
}
.waveform { display: block; width: 100%; height: 120px; }
.stage-meta { margin-top: 8px; min-height: 52px; }
.player-title { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; color: #fff; }
.player-sub { font-size: 0.92rem; color: var(--sky); margin-top: 4px; }
.stage-seek { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.seek-time { font-variant-numeric: tabular-nums; font-size: 0.82rem; color: var(--sky); min-width: 38px; }
.stage-seek .range { flex: 1; background: transparent; }

/* ---------- transport ---------- */
.transport {
  display: flex; align-items: center; justify-content: center;
  gap: 14px; margin: 18px 0;
}
.transport-btn {
  width: 58px; height: 58px;
  border-radius: 999px;
  border: 1.5px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  display: grid; place-items: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(13, 23, 34, 0.1);
  transition: background 150ms ease, transform 150ms ease, border-color 150ms ease;
}
.transport-btn:hover { background: #f4ead9; }
.transport-btn:active { transform: translateY(1px) scale(0.98); }
.transport-btn.play {
  width: 84px; height: 84px;
  background: var(--sky-strong); border-color: var(--sky-strong); color: #fff;
  box-shadow: 0 10px 24px rgba(46, 127, 163, 0.35);
}
.transport-btn.play:hover { background: #276e8d; }
.transport-btn.stop { width: 50px; height: 50px; color: var(--muted); }
.transport-btn svg { pointer-events: none; }

/* ---------- controls patch ---------- */
.controls-patch {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  display: grid;
  gap: 14px;
}
.seg-toggle {
  display: grid; grid-template-columns: 1fr 1fr;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  gap: 4px;
}
.seg-btn {
  min-height: 44px;
  border: 0; border-radius: 999px;
  background: transparent; color: var(--muted);
  font: 650 0.95rem var(--font);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}
.seg-btn.on { background: var(--leaf); color: #fff; }
.seg-btn:not(.on):hover { color: var(--ink); }
.control-row, .slider-row {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.control-label { font-size: 0.82rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); min-width: 64px; }
.big-select {
  min-height: 44px; padding: 4px 12px; flex: 1; min-width: 180px;
  border-radius: 12px; border: 1.5px solid var(--line-strong);
  background: var(--surface); color: var(--ink);
  font: 600 0.95rem var(--font);
}
.range { width: 200px; flex: 1; min-width: 160px; height: 30px; accent-color: var(--sky-strong); cursor: pointer; }
.slider-value { font-variant-numeric: tabular-nums; font-size: 0.9rem; color: var(--ink); min-width: 52px; text-align: right; }

.chip {
  min-height: 44px; padding: 8px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--line-strong);
  background: var(--surface); color: var(--ink);
  font: 600 0.9rem var(--font);
  display: inline-flex; align-items: center; gap: 7px;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}
.chip:hover { background: #f4ead9; }
.chip.on { background: var(--leaf); border-color: var(--leaf); color: #fff; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- up next / track lists ---------- */
.up-next { margin-top: 20px; }
.section-h { font-size: 0.95rem; margin: 0 0 10px; color: var(--ink); }
.track-list { display: grid; gap: 6px; }
.track-row {
  display: flex; align-items: center; gap: 12px;
  min-height: 52px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease;
}
.track-row:hover { background: #f4ead9; border-color: var(--line-strong); }
.track-row .track-num { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 0.85rem;
  min-width: 30px; display: grid; place-items: center; }
.track-row .track-num svg { color: var(--sky-strong); }
.track-row .track-title { flex: 1; font-size: 0.95rem; font-weight: 550; }
.track-row .track-play { color: var(--sky-strong); display: grid; place-items: center; }
.track-row.current { border-color: var(--leaf); background: #eef4ef; }
.track-list.compact .track-row { min-height: 46px; }

/* ---------- plus patch ---------- */
.plus-patch {
  margin-top: 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}
.plus-copy { display: grid; gap: 3px; }
.plus-copy strong { font-size: 1rem; }
.plus-copy span { font-size: 0.88rem; color: var(--muted); max-width: 52ch; }

/* ---------- mix: pack grid ---------- */
.screen { padding-bottom: 10px; }
.screen h1 { font-size: 1.45rem; }
.screen-sub { color: var(--muted); margin: 0 0 18px; max-width: 60ch; }
.pack-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.pack-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(13, 23, 34, 0.1);
  padding: 18px;
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}
.pack-card:hover { transform: translateY(-2px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.pack-card.locked { background: #f6efe2; }
.pack-title { font-weight: 750; font-size: 1.05rem; margin-bottom: 4px; }
.pack-sub { color: var(--muted); font-size: 0.86rem; margin-bottom: 12px; }
.pack-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
  font-size: 0.74rem; font-weight: 700;
  padding: 4px 10px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line);
  color: var(--muted);
}
.badge.free { background: var(--leaf); border-color: var(--leaf); color: #fff; }
.badge.plus { background: var(--sky-strong); border-color: var(--sky-strong); color: #fff; }
.badge.locked { background: var(--sun); border-color: var(--sun); color: var(--ink); }

.back-row { margin-bottom: 10px; }
.pack-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.pack-detail-sub { color: var(--muted); margin: 4px 0 14px; }
.track-list + h2, .control-row + h2 { margin-top: 20px; }

/* ---------- modals ---------- */
.modal {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 24px 60px rgba(13, 23, 34, 0.35);
  padding: 26px;
  width: min(560px, calc(100vw - 32px));
}
.modal::backdrop { background: rgba(13, 23, 34, 0.45); }
.modal h2 { margin: 0 0 8px; font-size: 1.2rem; }
.modal-hint { color: var(--muted); font-size: 0.9rem; margin: 0 0 14px; }
.field { display: grid; gap: 6px; margin-bottom: 14px; }
.field span { font-size: 0.82rem; font-weight: 700; }
.field input {
  min-height: 48px; padding: 8px 14px;
  border-radius: 12px; border: 1.5px solid var(--line-strong);
  background: var(--bg); font: 500 1rem var(--font); color: var(--ink);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 6px; }
.modal-status { min-height: 1.2em; font-size: 0.88rem; color: var(--leaf); margin: 10px 0 0; }

.pricing-list { display: grid; gap: 10px; max-height: 56vh; overflow: auto; }
.price-row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 14px; border-radius: 14px;
  border: 1px solid var(--line); background: var(--bg);
}
.price-row.owned { border-color: var(--leaf); background: #eef4ef; }
.price-name { font-weight: 700; }
.price-desc { font-size: 0.84rem; color: var(--muted); max-width: 40ch; }
.price-tag { font-weight: 750; font-variant-numeric: tabular-nums; }
.price-soon { font-size: 0.84rem; color: var(--muted); font-style: italic; }

/* ---------- bottom nav ---------- */
.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: rgba(255, 253, 252, 0.96);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(8px);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
}
.nav-btn {
  min-height: 56px;
  border: 0; background: transparent;
  display: grid; justify-items: center; align-items: center; gap: 3px;
  color: var(--muted); font: 650 0.72rem var(--font);
  text-decoration: none; cursor: pointer;
  border-radius: 12px;
  position: relative;
  transition: color 150ms ease, background 150ms ease;
}
.nav-btn svg { width: 22px; height: 22px; }
.nav-btn.on { color: var(--ink); }
.nav-btn.on::before {
  content: ""; position: absolute; top: -6px; left: 28%; right: 28%;
  height: 3px; border-radius: 0 0 3px 3px; background: var(--leaf);
}
.nav-btn:hover { background: var(--bg); color: var(--ink); }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 110px; transform: translateX(-50%);
  z-index: 80;
  background: var(--ink); color: #fff;
  padding: 12px 20px; border-radius: 999px;
  font-size: 0.92rem; font-weight: 550;
  box-shadow: 0 12px 30px rgba(13, 23, 34, 0.35);
  max-width: min(90vw, 480px); text-align: center;
}
.toast.error { background: var(--coral); color: #fff; }

.loading-block {
  padding: 40px 20px; text-align: center; color: var(--muted);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius);
}
.loading-block code { background: var(--bg); padding: 2px 6px; border-radius: 6px; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .sound-stage { padding: 18px 16px 16px; }
  .waveform { height: 90px; }
  .player-title { font-size: 1.15rem; }
  .transport-btn.play { width: 72px; height: 72px; }
  .transport { gap: 10px; }
  .control-label { min-width: 100%; }
  .big-select { min-width: 100%; }
  .range { min-width: 140px; }
  .app-main { padding: 12px 12px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}