:root {
  --navy: #1A2D7F;
  --navy-dark: #0F1B4D;
  --navy-light: #2A3F95;
  --red: #C8102E;
  --green: #16A34A;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-700: #334155;
  --gray-900: #0F172A;
  --text: #1F2937;
  --bg: #F5F7FB;
  --bg-card: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(15, 27, 77, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 27, 77, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 27, 77, 0.12);
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ── ヘッダー ───────────────────── */
.header {
  background: var(--navy);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.brand-mark {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 2px;
}

.brand-title {
  font-weight: 500;
  font-size: 15px;
  opacity: 0.85;
}

.header-nav {
  display: flex;
  gap: 8px;
}

.nav-btn {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
}

/* ── メイン ─────────────────────── */
.main {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--bg-card);
  padding: 26px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--gray-900);
}

.card-hint {
  font-size: 12px;
  color: var(--gray-500);
  margin: 0 0 22px;
  line-height: 1.6;
}

/* ── フォーム ────────────────────── */
.form-row {
  margin-bottom: 18px;
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-row label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}

.form-row input[type="text"],
.form-row input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  background: #fff;
}

.form-row input:focus {
  outline: 2px solid var(--navy-light);
  outline-offset: -1px;
  border-color: var(--navy);
}

/* ── 金属構成リスト ─────────────── */
.metals-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}

.metal-row {
  display: grid;
  grid-template-columns: 1fr 110px 40px;
  gap: 8px;
  align-items: center;
}

.metal-row select,
.metal-row input {
  padding: 9px 10px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  background: #fff;
}

.metal-row input {
  text-align: right;
}

.metal-row-suffix {
  font-size: 13px;
  color: var(--gray-500);
  text-align: center;
}

.metal-row-remove {
  background: transparent;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  font-size: 18px;
  cursor: pointer;
  color: var(--gray-500);
}

.metal-row-remove:hover {
  background: #FEE2E2;
  color: var(--red);
  border-color: #F5BBC4;
}

/* ── 計算結果カード ────────────── */
.result-card {
  background: linear-gradient(180deg, #fff, #FAFBFE);
  border: 1px solid var(--gray-100);
}

.breakdown {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--gray-200);
}

.breakdown-label {
  font-size: 13px;
  color: var(--gray-700);
}

.breakdown-label small {
  font-size: 11px;
  color: var(--gray-500);
  margin-left: 6px;
}

.breakdown-value {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 18px;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

.breakdown-total .breakdown-label {
  font-weight: 700;
  color: var(--gray-900);
}

.breakdown-total .breakdown-value {
  font-size: 20px;
  color: var(--navy);
}

/* ── 利益判定（大きく目立たせる） ── */
.verdict {
  padding: 28px 24px;
  border-radius: 12px;
  text-align: center;
  background: linear-gradient(135deg, #E8F5EE, #F0F9F4);
  border: 2px solid #BBE5C9;
  transition: all 0.3s;
}

.verdict.negative {
  background: linear-gradient(135deg, #FEE8EC, #FEF1F3);
  border-color: #F5BBC4;
}

.verdict.neutral {
  background: var(--gray-50);
  border-color: var(--gray-200);
}

.verdict-status {
  font-size: 22px;
  font-weight: 700;
  color: var(--green);
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.verdict.negative .verdict-status {
  color: var(--red);
}

.verdict.neutral .verdict-status {
  color: var(--gray-500);
}

.verdict-profit {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 44px;
  color: var(--green);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.verdict.negative .verdict-profit {
  color: var(--red);
}

.verdict.neutral .verdict-profit {
  color: var(--gray-500);
}

.verdict-margin {
  margin-top: 8px;
  font-size: 14px;
  color: var(--gray-500);
  font-weight: 500;
}

/* ── ボタン ─────────────────────── */
.btn-primary,
.btn-secondary {
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--navy);
  color: #fff;
}

.btn-primary:hover { background: var(--navy-dark); }

.btn-secondary {
  background: #fff;
  color: var(--navy);
  border-color: var(--gray-200);
}

.btn-secondary:hover {
  border-color: var(--navy);
  background: var(--gray-50);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 12px;
}

/* ── モーダル ────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal[hidden] {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 27, 77, 0.4);
  backdrop-filter: blur(2px);
}

.modal-panel {
  position: relative;
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-panel-wide {
  max-width: 680px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-100);
}

.modal-header h3 {
  margin: 0;
  font-size: 16px;
  color: var(--gray-900);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--gray-500);
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.modal-close:hover { background: var(--gray-100); }

.modal-body {
  padding: 22px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 22px;
  border-top: 1px solid var(--gray-100);
  background: var(--gray-50);
  border-radius: 0 0 12px 12px;
}

/* ── 設定モーダルの内訳UI ────── */
.form-divider {
  border: none;
  border-top: 1px solid var(--gray-200);
  margin: 18px 0;
}

.cost-row {
  display: grid;
  grid-template-columns: 1fr 140px 50px;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}

.cost-label {
  font-size: 13px;
  color: var(--gray-700);
}

.cost-row input {
  padding: 9px 10px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  text-align: right;
  background: #fff;
}

.cost-row input:focus {
  outline: 2px solid var(--navy-light);
  outline-offset: -1px;
  border-color: var(--navy);
}

.cost-suffix {
  font-size: 12px;
  color: var(--gray-500);
}

.rate-summary {
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
}

.rate-summary-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 8px 0;
  font-size: 13px;
}

.rate-summary-row + .rate-summary-row {
  border-top: 1px dashed var(--gray-200);
}

.rate-summary-row span:first-child {
  color: var(--gray-700);
}

.rate-summary-row span:last-child {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.rate-summary-result {
  font-size: 15px;
}

.rate-summary-result span:first-child {
  font-weight: 700;
  color: var(--gray-900);
}

.rate-summary-result span:last-child {
  font-weight: 700;
  font-size: 20px;
  color: var(--navy);
}

/* ── 金属マスタテーブル ─────────── */
.table-wrap {
  overflow-x: auto;
  margin-bottom: 14px;
}

.metals-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.metals-table th,
.metals-table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
}

.metals-table th {
  font-weight: 600;
  color: var(--gray-500);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.metals-table td.num,
.metals-table th.num {
  text-align: right;
  font-family: 'Inter', sans-serif;
  font-variant-numeric: tabular-nums;
}

.hint {
  font-size: 12px;
  color: var(--gray-500);
  margin: 0 0 14px;
  line-height: 1.6;
}

.hint-sub {
  font-size: 11px;
  color: var(--gray-500);
  margin: 4px 0 0;
}

/* ── フッター ────────────────────── */
.footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
  font-size: 12px;
  color: var(--gray-500);
  text-align: center;
}

/* ── レスポンシブ ────────────────── */
@media (max-width: 520px) {
  .form-row-2 {
    grid-template-columns: 1fr;
  }
  .verdict-profit {
    font-size: 36px;
  }
  .header-inner,
  .main,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }
}