:root {
  --color-bg: #f2f4f6;
  --color-panel: #ffffff;
  --color-border: #d0d5db;
  --color-text: #202428;
  --color-muted: #5b6472;
  --color-primary: #1f4e79;
  --color-primary-dark: #163a5a;
  --color-danger: #b3261e;
  --color-danger-bg: #fdecea;
  --color-profit-pos: #1e6b3c;
  --color-profit-neg: #b3261e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Segoe UI", "Meiryo", "Hiragino Kaku Gothic ProN", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

.app-header {
  background: var(--color-primary);
  color: #fff;
  padding: 14px 24px;
}

.app-header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.app-header .version {
  font-size: 13px;
  font-weight: 400;
  opacity: 0.8;
  margin-left: 8px;
}

.app-main {
  display: flex;
  gap: 20px;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: flex-start;
  flex-wrap: wrap;
}

.panel {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px;
  flex: 1 1 420px;
  min-width: 300px;
}

.panel h2 {
  margin-top: 0;
  font-size: 17px;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 8px;
  color: var(--color-primary);
}

.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}

.field label {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.field input,
.field select {
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 15px;
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.calc-button {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

.calc-button:hover {
  background: var(--color-primary-dark);
}

.error-box {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
  border-radius: 4px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 14px;
}

.error-box ul {
  margin: 6px 0 0 20px;
  padding: 0;
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

.result-table th,
.result-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.result-table th {
  color: var(--color-muted);
  font-weight: 500;
  width: 55%;
}

.result-table td {
  text-align: right;
  font-weight: 600;
}

.result-table tr.highlight th,
.result-table tr.highlight td {
  background: #eef3f8;
  font-weight: 700;
}

.result-table tr.profit-positive td {
  color: var(--color-profit-pos);
}

.result-table tr.profit-negative td {
  color: var(--color-profit-neg);
}

.placeholder {
  color: var(--color-muted);
}

.app-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 12px;
  padding: 16px;
}

.error-main {
  padding: 40px 20px;
  justify-content: center;
}

@media (max-width: 720px) {
  .app-main {
    flex-direction: column;
  }

  .panel {
    flex: 1 1 auto;
    width: 100%;
  }
}

/* 注意書き・算出不可表示 */
.notice { font-size: 0.85rem; color: #555; margin: 0.5rem 0; }
.profit-unknown td { color: #555; font-style: italic; }

.hint { display: block; font-size: 0.8rem; color: #555; margin: 0.1rem 0 0.3rem; }