:root {
  --bg-1: #081c15;
  --bg-2: #1b4332;
  --panel: rgba(216, 243, 220, 0.12);
  --panel-border: rgba(216, 243, 220, 0.35);
  --text: #f1faee;
  --muted: #cde6d0;
  --accent: #95d5b2;
  --accent-2: #74c69d;
  --danger: #e63946;
  --danger-2: #c1121f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, #2d6a4f 0%, var(--bg-2) 35%, var(--bg-1) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.app {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: 0.02em;
}

header {
  display: grid;
  gap: 4px;
}

header p {
  margin: 0;
  color: var(--muted);
}

.card {
  backdrop-filter: blur(6px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

label {
  font-weight: 600;
}

select,
input,
button {
  width: 100%;
  border: 1px solid rgba(241, 250, 238, 0.25);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
}

select,
input {
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
}

input::placeholder {
  color: var(--muted);
  opacity: 0.7;
}

button {
  cursor: pointer;
  color: #052e16;
  font-weight: 700;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

button:hover {
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-danger {
  color: #fff;
  background: linear-gradient(180deg, var(--danger), var(--danger-2));
  flex-shrink: 0;
  width: auto;
  padding: 8px 14px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

#manage-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.track-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.track-item--col {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}

.track-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.track-skip {
  display: flex;
  align-items: center;
  gap: 8px;
}

.skip-label {
  font-weight: normal;
  font-size: 0.875rem;
  color: var(--muted);
  white-space: nowrap;
}

.skip-input {
  width: 70px;
  flex-shrink: 0;
}

.skip-unit {
  color: var(--muted);
  font-size: 0.875rem;
  white-space: nowrap;
}

.btn-save {
  width: auto;
  padding: 6px 12px;
  font-size: 0.875rem;
}

.track-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-item button {
  flex-shrink: 0;
  width: auto;
  padding: 8px 14px;
}

.track-source {
  flex-shrink: 0;
  font-size: 0.85rem;
  color: #4a90e2;
  text-decoration: none;
  padding: 4px 8px;
}
.track-source:hover { text-decoration: underline; }