:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #21253a;
  --border: #2a2f45;
  --text: #e8eaf0;
  --text-muted: #7a7f9a;
  --accent: #4f8ef7;
  --green: #34d399;
  --red: #f87171;
  --yellow: #fbbf24;
  --card-bg: #1e2235;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 24px 16px 64px;
}

header {
  max-width: 760px;
  margin: 0 auto 32px;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

header p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.card-selector {
  max-width: 760px;
  margin: 0 auto 24px;
  position: relative;
}

.card-display {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
  pointer-events: none;
  padding-right: 36px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%237a7f9a' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px bottom 12px;
}

.card-selector select {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  font-size: 1rem;
}

/* Summary bar */
.summary-bar {
  max-width: 760px;
  margin: 0 auto 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.summary-bar .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.summary-bar .stat label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.summary-bar .stat .value {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.summary-bar .stat .value.positive { color: var(--green); }
.summary-bar .stat .value.negative { color: var(--red); }
.summary-bar .stat .value.neutral  { color: var(--text); }

/* Progress bar */
.break-even-bar {
  max-width: 760px;
  margin: 0 auto 28px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 24px;
}

.break-even-bar .label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.progress-track {
  height: 10px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.2s ease, background-color 0.2s ease;
  background: var(--red);
}

.progress-fill.near { background: var(--yellow); }
.progress-fill.over { background: var(--green); }

.break-even-bar .status-text {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.break-even-bar .status-text strong {
  color: var(--text);
}

/* Actions row */
.actions-row {
  max-width: 760px;
  margin: 0 auto 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.actions-row .count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* Credit cards */
.credits-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.credit-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  transition: border-color 0.15s;
}

.credit-item.active {
  border-color: #354060;
}

.credit-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.credit-title {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.credit-title .name {
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s;
}

.credit-title .name:hover {
  color: var(--accent);
}

.period-badge {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--border);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.credit-values {
  display: flex;
  align-items: baseline;
  gap: 3px;
  white-space: nowrap;
  flex-shrink: 0;
}

.slider-current {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
  transition: color 0.15s;
}

.slider-current.zero {
  color: var(--text-muted);
}

.slider-max {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Slider */
.slider-row {
  margin-bottom: 10px;
}

.slider-row input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 99px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
  transition: background 0.15s, transform 0.1s;
}

.slider-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
}

/* Fill the slider track up to the thumb */
.slider-row input[type="range"] {
  background: linear-gradient(
    to right,
    var(--accent) 0%,
    var(--accent) var(--fill-pct, 0%),
    var(--border) var(--fill-pct, 0%),
    var(--border) 100%
  );
}

/* Toggle (binary credits) */
.toggle-row {
  margin-bottom: 10px;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  display: none;
}

.toggle-track {
  width: 40px;
  height: 22px;
  background: var(--border);
  border-radius: 99px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}

.toggle-label input:checked + .toggle-track {
  background: var(--accent);
}

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}

.toggle-label input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
}

.toggle-text {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Notes & tags (expanded) */
.credit-notes {
  display: none;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 8px;
  padding: 8px 12px;
  background: var(--surface);
  border-radius: 8px;
  border-left: 3px solid var(--border);
}

.credit-item.expanded .credit-notes {
  display: block;
}

/* Footer */
footer {
  max-width: 760px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 600px) {
  body {
    padding: 16px 12px 48px;
  }

  header h1 {
    font-size: 1.3rem;
  }

  .summary-bar {
    grid-template-columns: 1fr 1fr;
    padding: 14px 16px;
    gap: 12px;
  }

  .summary-bar .stat:last-child {
    grid-column: 1 / -1;
  }

  .summary-bar .stat .value {
    font-size: 1.3rem;
  }

  .break-even-bar {
    padding: 12px 16px;
  }

  .actions-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .actions-row > div {
    width: 100%;
    display: flex;
    gap: 6px;
  }

  .btn-ghost {
    flex: 1;
    text-align: center;
    padding: 8px 6px;
  }

  .credit-item {
    padding: 12px 14px;
  }

  .credit-header {
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
  }

  .credit-title {
    gap: 6px;
  }

  .credit-values {
    align-self: flex-start;
  }

  /* Bigger thumb for touch */
  .slider-row input[type="range"]::-webkit-slider-thumb {
    width: 26px;
    height: 26px;
  }

  .slider-row input[type="range"]::-moz-range-thumb {
    width: 26px;
    height: 26px;
  }
}