:root {
  --bg: #05070b;
  --bg-2: #0a1018;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-2: rgba(255, 255, 255, 0.04);
  --panel-3: rgba(255, 255, 255, 0.03);
  --stroke: rgba(255, 255, 255, 0.10);
  --stroke-strong: rgba(255, 255, 255, 0.16);

  --text: #f3f7ff;
  --muted: #9ba8bc;
  --muted-2: #738197;

  --accent: #7dd3fc;
  --accent-2: #4f9cff;
  --accent-3: #8b5cf6;

  --danger: #ff647c;
  --success: #3ddc97;

  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.42);
  --shadow-md: 0 14px 30px rgba(0, 0, 0, 0.26);

  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;

  --tap: 48px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 50% -10%, rgba(125, 211, 252, 0.18), transparent 26%),
    radial-gradient(circle at 100% 0%, rgba(79, 156, 255, 0.12), transparent 24%),
    radial-gradient(circle at 0% 20%, rgba(139, 92, 246, 0.10), transparent 24%),
    linear-gradient(180deg, #06080d 0%, #09111a 44%, #05070b 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  padding: 12px;
}

.app-shell {
  max-width: 820px;
  margin: 0 auto;
}

.app {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.045));
  border: 1px solid var(--stroke);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px) saturate(130%);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
  padding: 14px;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.045), transparent 25%);
  pointer-events: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow:
    0 0 0 6px rgba(125, 211, 252, 0.10),
    0 0 22px rgba(125, 211, 252, 0.45);
}

.session-create,
.session-open,
.add-song {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-bottom: 10px;
}

input {
  width: 100%;
  min-height: var(--tap);
  padding: 14px 16px;
  color: var(--text);
  font-size: 15px;
  border-radius: 18px;
  border: 1px solid var(--stroke);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.04));
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

input::placeholder {
  color: var(--muted-2);
}

input:focus {
  border-color: rgba(125, 211, 252, 0.45);
  box-shadow:
    0 0 0 4px rgba(125, 211, 252, 0.10),
    inset 0 1px 0 rgba(255,255,255,0.03);
}

.message {
  min-height: 20px;
  margin: 2px 2px 10px;
  font-size: 14px;
  color: var(--muted);
}

.message.success {
  color: var(--success);
}

.message.error {
  color: #ff8ca0;
}

.meta-box,
.now-playing {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.055), rgba(255,255,255,0.035));
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  padding: 14px;
  box-shadow: var(--shadow-md);
}

.meta-kicker {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.meta-sub {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  word-break: break-word;
}

.meta-box h2,
.now-playing h2,
.section-head h2 {
  margin: 0 0 6px;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.session-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.session-tools .btn-danger {
  grid-column: 1 / -1;
}

.player-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 4px;
  overflow: hidden;
  border-radius: 24px;
  border: 1px solid var(--stroke-strong);
  background:
    radial-gradient(circle at 50% 0%, rgba(125, 211, 252, 0.10), transparent 35%),
    linear-gradient(180deg, #05070b, #0a1018);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.05),
    var(--shadow-lg);
}

#player,
#player iframe {
  width: 100%;
  height: 100%;
}

.player-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.01));
}

.player-placeholder.hidden {
  display: none;
}

.placeholder-inner h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.placeholder-inner p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.placeholder-disc {
  width: 78px;
  height: 78px;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: white;
  font-size: 24px;
  background:
    linear-gradient(135deg, rgba(125, 211, 252, 0.30), rgba(79, 156, 255, 0.18));
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow:
    0 10px 30px rgba(79, 156, 255, 0.25),
    inset 0 1px 0 rgba(255,255,255,0.08);
}

.now-playing {
  margin-top: 12px;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.song-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.song-item {
  display: grid;
  grid-template-columns: 98px 1fr;
  gap: 10px;
  padding: 10px;
  border-radius: 20px;
  border: 1px solid var(--stroke);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.035));
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.song-item:hover {
  transform: translateY(-1px);
}

.song-item.active {
  border-color: rgba(125, 211, 252, 0.38);
  background:
    linear-gradient(180deg, rgba(125, 211, 252, 0.10), rgba(79, 156, 255, 0.06));
  box-shadow:
    inset 0 0 0 1px rgba(125, 211, 252, 0.10),
    0 8px 24px rgba(79, 156, 255, 0.10);
}

.song-thumb {
  width: 98px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 14px;
  background: #111827;
  border: 1px solid rgba(255,255,255,0.06);
}

.song-body {
  min-width: 0;
}

.song-title {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  word-break: break-word;
}

.song-sub {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  word-break: break-all;
}

.song-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.empty-box {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  border-radius: 18px;
  border: 1px dashed var(--stroke);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
}

button {
  min-height: var(--tap);
  padding: 12px 14px;
  border: 0;
  border-radius: 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.01em;
  transition: transform .16s ease, filter .16s ease, opacity .16s ease, box-shadow .16s ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
}

button:active {
  transform: translateY(0);
}

.btn {
  width: 100%;
}

.btn-primary {
  color: #ffffff;
  background:
    linear-gradient(135deg, var(--accent-2), var(--accent-3));
  box-shadow:
    0 10px 24px rgba(79, 156, 255, 0.24),
    inset 0 1px 0 rgba(255,255,255,0.12);
}

.btn-secondary {
  color: var(--text);
  border: 1px solid var(--stroke);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.045));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.btn-danger {
  color: #ffb1bc;
  border: 1px solid rgba(255, 100, 124, 0.20);
  background:
    linear-gradient(180deg, rgba(255,100,124,0.16), rgba(255,100,124,0.10));
}

.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-danger:focus-visible,
input:focus-visible {
  outline: none;
}

@media (min-width: 768px) {
  body {
    padding: 18px;
  }

  .app-shell {
    max-width: 1080px;
  }

  .app {
    gap: 16px;
  }

  .card {
    padding: 16px;
  }

  .song-item {
    grid-template-columns: 120px 1fr auto;
    align-items: center;
  }

  .song-thumb {
    width: 120px;
  }

  .song-actions {
    display: flex;
    flex-direction: column;
    width: 100px;
    margin-top: 0;
  }

  .session-tools {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .session-tools .btn-danger {
    grid-column: auto;
  }
}