:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --danger: #b91c1c;
  --border: #d1d5db;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.5;
}

.page {
  max-width: 1120px;
  margin: 20px auto 40px;
  padding: 0 16px;
  display: grid;
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.header h1 {
  margin: 0 0 6px;
  font-size: 1.8rem;
}

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

.main-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}

.field {
  margin-bottom: 16px;
}

label,
legend {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 1rem;
}

select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 1rem;
  background: #fff;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
}

.range-with-input {
  display: grid;
  grid-template-columns: 1fr 120px;
  gap: 10px;
  align-items: center;
}

.quick-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}

button {
  border: 1px solid #93c5fd;
  background: #dbeafe;
  color: #1e3a8a;
  padding: 8px 10px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.98);
}

.toggle-advanced {
  width: 100%;
  border-color: #bfdbfe;
  background: #eff6ff;
}

.advanced-panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

.radio-item {
  display: flex;
  gap: 8px;
  align-items: center;
  font-weight: 500;
  margin-bottom: 8px;
}

.custom-unit-price-wrap {
  margin-top: 8px;
}

.custom-unit-price-wrap label {
  font-weight: 600;
}

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

.total-cash {
  margin: 4px 0 16px;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--danger);
}

.monthly-cash {
  color: #1d4ed8;
}

.result-list {
  margin: 0;
}

.result-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid #e5e7eb;
  padding: 9px 0;
}

.result-list dt {
  color: #334155;
}

.result-list dd {
  margin: 0;
  font-weight: 700;
}

.ad-safe {
  min-height: 100px;
  padding: 24px;
}

.ad-rect {
  min-height: 280px;
}

.disclaimer p {
  margin: 0 0 10px;
  color: #374151;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .quick-buttons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .range-with-input {
    grid-template-columns: 1fr;
  }
}