:root {
  --bg: #f4f6f8;
  --bg-accent: #e8eef4;
  --ink: #1a2332;
  --muted: #5a6a7a;
  --line: #d5dee8;
  --card: #ffffff;
  --brand: #1e4d7b;
  --brand-soft: #e8f1f8;
  --brand-hover: #163a5c;
  --radius: 14px;
  --shadow: 0 8px 28px rgba(26, 35, 50, 0.06);
  --font: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 480px at 10% -10%, var(--bg-accent), transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #eef3f7, transparent 50%),
    var(--bg);
  line-height: 1.65;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(244, 246, 248, 0.88);
  border-bottom: 1px solid rgba(213, 222, 232, 0.85);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand {
  font-weight: 750;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--brand);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--brand);
}

main {
  padding: 2.4rem 0 3.5rem;
}

.hero {
  padding: 1.2rem 0 0.5rem;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.65rem, 4vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero .lead {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  font-weight: 650;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
}

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

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

.btn-secondary {
  background: var(--card);
  color: var(--brand);
  border-color: rgba(30, 77, 123, 0.25);
}

.btn-secondary:hover {
  background: var(--brand-soft);
  color: var(--brand);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.2rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.02rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.35rem;
  box-shadow: var(--shadow);
}

.panel h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.45rem, 3.5vw, 1.85rem);
}

.panel .intro {
  margin: 0 0 1.25rem;
  color: var(--muted);
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.feature-list li {
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid rgba(213, 222, 232, 0.8);
}

.feature-list strong {
  display: block;
  margin-bottom: 0.2rem;
}

.feature-list span {
  color: var(--muted);
  font-size: 0.94rem;
}

.bullet-list {
  margin: 0 0 1.25rem;
  padding-left: 1.2rem;
  color: var(--ink);
}

.bullet-list li {
  margin: 0.45rem 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  align-items: center;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.1rem;
  justify-content: center;
}

.footer-links a {
  color: var(--muted);
  font-weight: 600;
}

.beian a {
  color: var(--muted);
}

.tool-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.tool-form {
  display: grid;
  gap: 0.75rem;
}

.tool-form label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.9rem;
  font-weight: 650;
  color: var(--ink);
}

.tool-form input,
.tool-form select {
  min-height: 40px;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  background: #fff;
}

.tool-form .row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.25rem;
}

.tool-note {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.tool-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.tool-table th,
.tool-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.35rem;
  text-align: left;
  vertical-align: top;
}

.tool-table th {
  color: var(--muted);
  font-weight: 650;
}

.tool-result {
  margin-top: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--brand-soft);
  border-radius: 10px;
  font-weight: 650;
}

.subhead {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.panel-inset {
  padding: 1rem 1.05rem;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid rgba(213, 222, 232, 0.85);
}

.member-status {
  margin: 0.65rem 0 0;
  font-weight: 650;
  color: var(--brand);
}

.calc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.15rem;
}

.calc-tab {
  min-height: 36px;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 650;
  cursor: pointer;
}

.calc-tab.active {
  background: var(--brand-soft);
  border-color: rgba(30, 77, 123, 0.28);
  color: var(--brand);
}

.calc-pane {
  margin-bottom: 0.5rem;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.tool-grid-2 {
  grid-template-columns: 1fr 1fr;
}

.history-block {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.history-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.history-head .subhead {
  margin: 0;
}

.history-lock {
  padding: 1rem 1.05rem;
  border-radius: 12px;
  background: var(--bg);
  border: 1px dashed rgba(30, 77, 123, 0.28);
}

.history-lock p {
  margin: 0 0 0.85rem;
  color: var(--muted);
}

.overview {
  margin: 1.1rem 0 0.25rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.stat-card {
  background: var(--bg);
  border: 1px solid rgba(213, 222, 232, 0.85);
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
}

.stat-label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
}

.stat-value.is-pos {
  color: #1b6b3a;
}

.stat-value.is-neg {
  color: #b42318;
}

.sell-extra {
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: #eef4f9;
  border: 1px solid rgba(30, 77, 123, 0.15);
}

.sell-extra[hidden] {
  display: none !important;
}

.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.chart-card {
  background: var(--bg);
  border: 1px solid rgba(213, 222, 232, 0.85);
  border-radius: 12px;
  padding: 0.95rem 1rem;
}

.dist-bars {
  display: grid;
  gap: 0.55rem;
}

.dist-row {
  display: grid;
  grid-template-columns: minmax(4.5rem, 28%) 1fr auto;
  gap: 0.45rem;
  align-items: center;
  font-size: 0.88rem;
}

.dist-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 650;
}

.dist-track {
  height: 10px;
  border-radius: 999px;
  background: #e6edf4;
  overflow: hidden;
}

.dist-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #1e4d7b, #3d7ab0);
}

.dist-val {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 0.84rem;
}

.trend-wrap {
  margin-top: 0.25rem;
}

.trend-legend {
  display: flex;
  gap: 1rem;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.trend-legend .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 0.35rem;
  vertical-align: -1px;
}

.trend-legend .swatch.buy {
  background: #1e4d7b;
}

.trend-legend .swatch.sell {
  background: #7aa2c7;
}

.compare-table th:nth-child(2),
.compare-table td:nth-child(2),
.compare-table th:nth-child(3),
.compare-table td:nth-child(3) {
  white-space: nowrap;
  width: 5.5rem;
  text-align: center;
}

.sku-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1.35rem;
  padding: 1.15rem 1.2rem;
  border-radius: 14px;
  border: 1px solid rgba(30, 77, 123, 0.22);
  background: linear-gradient(135deg, #eef5fb, #f7fafc);
}

.sku-name {
  font-size: 1.15rem;
  font-weight: 750;
}

.sku-desc {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.94rem;
  max-width: 28rem;
}

.sku-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.65rem;
}

.sku-price {
  font-size: 1.85rem;
  font-weight: 780;
  letter-spacing: -0.03em;
  color: var(--brand);
  line-height: 1;
}

.sku-yen {
  font-size: 1rem;
  margin-right: 0.1rem;
}

.sku-unit {
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--muted);
  margin-left: 0.15rem;
}

.pay-panel h1 {
  margin-bottom: 0.5rem;
}

.pay-box {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
  overflow: hidden;
}

.pay-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.05rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}

.pay-row:last-child {
  border-bottom: 0;
}

.pay-row > span {
  color: var(--muted);
}

.pay-amount,
.pay-ok {
  color: var(--brand);
  font-size: 1.15rem;
}

.pay-alipay {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 650;
}

@media (max-width: 760px) {
  .form-grid-2,
  .tool-grid-2,
  .stat-grid,
  .chart-grid {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.btn-danger {
  background: #fff;
  color: #b42318;
  border-color: rgba(180, 35, 24, 0.3);
}

.btn-danger:hover {
  background: #fef3f2;
}

@media (max-width: 760px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }
}