:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-alt: #edf2f5;
  --text: #132534;
  --muted: #5b6f7f;
  --primary: #0f4c5c;
  --primary-strong: #0a3742;
  --accent: #f28f3b;
  --danger: #c73e1d;
  --success: #1d8348;
  --border: #d4dde4;
  --shadow: 0 14px 30px rgba(15, 76, 92, 0.09);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, rgba(242, 143, 59, 0.15), transparent 35%),
    radial-gradient(circle at 90% 0%, rgba(15, 76, 92, 0.14), transparent 30%),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1160px, 92vw);
  margin: 0 auto;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(15, 76, 92, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(130deg, var(--primary), #246c81);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.nav-link:hover {
  background: rgba(15, 76, 92, 0.1);
  color: var(--text);
  text-decoration: none;
}

.nav-link.active {
  background: var(--primary);
  color: #fff;
}

.page-main {
  padding: 26px 0 58px;
}

.page-hero {
  padding: 30px;
  border-radius: 20px;
  background: linear-gradient(130deg, #0f4c5c, #1b6075);
  color: #fff;
  box-shadow: var(--shadow);
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.2;
}

.page-hero p {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.88);
  max-width: 700px;
}

.hero-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 8px 20px rgba(19, 37, 52, 0.04);
}

.card h2,
.card h3 {
  margin-top: 0;
}

.card h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

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

.kpi {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: linear-gradient(180deg, #fff, #f5f9fb);
}

.kpi-label {
  color: var(--muted);
  font-size: 13px;
}

.kpi-value {
  font-family: "DIN Alternate", "Avenir Next", "Segoe UI", sans-serif;
  font-size: clamp(20px, 2.5vw, 31px);
  font-weight: 700;
  color: var(--text);
}

form {
  display: grid;
  gap: 14px;
}

.form-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: rgba(15, 76, 92, 0.64);
  box-shadow: 0 0 0 3px rgba(15, 76, 92, 0.15);
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid transparent;
  min-height: 42px;
  border-radius: 10px;
  padding: 0 14px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(15, 76, 92, 0.22);
}

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

.btn-secondary {
  background: #fff;
  color: var(--primary);
  border-color: rgba(15, 76, 92, 0.3);
}

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

.btn-danger {
  background: #fff;
  color: var(--danger);
  border-color: rgba(199, 62, 29, 0.35);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(15, 76, 92, 0.12);
  color: var(--primary-strong);
}

.tag.success {
  background: rgba(29, 131, 72, 0.15);
  color: var(--success);
}

.tag.warn {
  background: rgba(242, 143, 59, 0.15);
  color: #8b4f0f;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid #e6edf2;
  text-align: right;
  white-space: nowrap;
  font-size: 14px;
}

.data-table th:first-child,
.data-table td:first-child,
.data-table th:nth-child(2),
.data-table td:nth-child(2) {
  text-align: left;
}

.data-table th {
  background: #f4f8fa;
  color: #375162;
  font-size: 13px;
}

.data-table tbody tr:hover {
  background: #f7fbfd;
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}

.list-item strong {
  font-size: 15px;
}

.delta-up {
  color: var(--danger);
  font-weight: 700;
}

.delta-down {
  color: var(--success);
  font-weight: 700;
}

.empty {
  padding: 20px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
  text-align: center;
  background: rgba(255, 255, 255, 0.6);
}

.two-col {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 16px;
  align-items: start;
}

.badge-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.footer {
  border-top: 1px solid rgba(15, 76, 92, 0.14);
  padding: 16px 0 30px;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.notice {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(242, 143, 59, 0.4);
  background: rgba(242, 143, 59, 0.1);
  color: #7f4b11;
  font-size: 14px;
}

.hidden {
  display: none !important;
}

.mono {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

.article-wrap {
  display: grid;
  gap: 16px;
}

.article-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 8px 20px rgba(19, 37, 52, 0.04);
}

.article-title {
  margin: 0;
  font-size: clamp(28px, 3.3vw, 38px);
  line-height: 1.25;
}

.meta-row {
  margin-top: 8px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}

.toc-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.article-content {
  display: grid;
  gap: 12px;
}

.article-content h2 {
  margin: 10px 0 4px;
  font-size: 24px;
}

.article-content h3 {
  margin: 8px 0 2px;
  font-size: 19px;
}

.article-content p,
.article-content li {
  color: #203746;
  line-height: 1.74;
}

.article-content ul,
.article-content ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.quote-box {
  border-left: 4px solid rgba(15, 76, 92, 0.35);
  background: #f3f8fa;
  border-radius: 10px;
  padding: 12px 14px;
  color: #2a4657;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.link-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
}

.link-card h3 {
  margin: 0 0 6px;
}

@media (max-width: 980px) {
  .grid-2,
  .grid-3,
  .two-col,
  .form-grid,
  .form-grid-3,
  .link-grid {
    grid-template-columns: 1fr;
  }

  .header-inner {
    padding: 6px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .nav-link {
    white-space: nowrap;
  }

  .page-main {
    padding-top: 18px;
  }

  .page-hero {
    padding: 22px;
  }
}

/* ===== mortgage-calculator yst-shell 主页精修补丁 ===== */
.mc-card { padding: 16px 18px; margin-bottom: 14px; }

/* Hero */
.mc-hero { text-align: center; padding: 18px 16px; }
.mc-hero-title {
    font: 700 24px var(--yst-font);
    color: var(--yst-text);
    margin: 0 0 8px;
    letter-spacing: -0.01em;
}
.mc-hero-desc {
    font: 14px/1.6 var(--yst-font);
    color: var(--yst-text-muted);
    margin: 0 0 16px;
    max-width: 640px;
    margin-left: auto; margin-right: auto;
}
.mc-hero-actions {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}
.mc-cta-primary { padding: 0 24px !important; height: 44px !important; font-size: 14px !important; }
.mc-cta-ghost { padding: 0 18px !important; height: 44px !important; }

/* KPI */
.mc-kpi-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.mc-kpi {
    background: var(--yst-bg-subtle) !important;
    border: 1px solid var(--yst-border) !important;
    border-left: 3px solid var(--yst-brand) !important;
    border-radius: 6px !important;
    padding: 12px 14px !important;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.mc-kpi-label {
    font: 11px var(--yst-font);
    color: var(--yst-text-muted);
    text-transform: uppercase;
    letter-spacing: 1.2px;
}
.mc-kpi-value {
    font: 700 22px var(--yst-font);
    color: var(--yst-text);
}

/* Grid 2 col */
.mc-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.mc-feature-card {
    background: #fff !important;
    border: 1px solid var(--yst-border) !important;
    border-radius: 8px !important;
    padding: 14px 16px !important;
}
.mc-feature-title {
    font: 700 14px var(--yst-font);
    color: var(--yst-text);
    margin: 0 0 8px;
    letter-spacing: var(--yst-letter-spacing);
}
.mc-feature-list,
.mc-recent-list {
    margin: 0;
    padding-left: 18px;
    color: var(--yst-text-2);
    font: 13px/1.7 var(--yst-font);
}

@media (max-width: 768px) {
    .mc-kpi-grid { grid-template-columns: 1fr; }
    .mc-grid-2 { grid-template-columns: 1fr; }
    .mc-hero-title { font-size: 20px; }
}