:root {
  --bg: #f5efe4;
  --paper: rgba(255, 251, 245, 0.88);
  --panel: rgba(255, 249, 242, 0.95);
  --text: #201913;
  --muted: #6e5c4f;
  --line: rgba(99, 74, 57, 0.14);
  --accent: #d26b37;
  --accent-deep: #8e3f1d;
  --accent-soft: #f2cba8;
  --success: #2f7d57;
  --warning: #b36a16;
  --danger: #a63b2c;
  --shadow: 0 16px 38px rgba(80, 45, 21, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(210, 107, 55, 0.22), transparent 22%),
    radial-gradient(circle at right top, rgba(141, 63, 29, 0.12), transparent 18%),
    linear-gradient(180deg, #fbf5ee 0%, #f5efe4 55%, #efe3d3 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), transparent);
  opacity: 0.2;
}

body,
input,
button {
  -webkit-tap-highlight-color: transparent;
}

.page-shell {
  width: min(100% - 20px, 1120px);
  margin: 0 auto;
  padding: 10px 0 calc(92px + env(safe-area-inset-bottom));
}

.hero,
.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.hero {
  padding: 18px;
  border-radius: 24px;
}

.panel {
  padding: 18px;
  border-radius: 22px;
  margin-top: 16px;
}

.topbar,
.hero-grid,
.calculator-grid,
.result-main,
.faq-list,
.formula-list,
.example-grid,
.content-stack,
.quick-nav-grid {
  display: grid;
}

.topbar {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.brand,
h1,
h2,
h3,
.hero-stat {
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.top-link,
.button,
.quick-nav-grid a {
  text-decoration: none;
}

.top-link {
  color: var(--accent-deep);
  font-weight: 700;
  font-size: 0.94rem;
}

.hero-grid {
  grid-template-columns: 1fr;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-deep);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 10vw, 3.5rem);
  line-height: 1;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 7vw, 2.4rem);
  line-height: 1.1;
}

h3 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.3;
}

.lead,
.body-copy,
.hero-card p,
.form-note,
.result-tip,
.faq-list p,
.formula-card p,
.section-copy,
.example-card p {
  color: var(--muted);
  line-height: 1.72;
}

.lead,
.section-copy {
  margin: 14px 0 0;
  font-size: 0.98rem;
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.hero-highlights span,
.chip-button {
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(99, 74, 57, 0.12);
  color: var(--accent-deep);
  font-size: 0.85rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
}

.button.primary {
  color: #fff8f2;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: 0 12px 24px rgba(142, 63, 29, 0.24);
}

.button.secondary {
  color: var(--accent-deep);
  background: rgba(255, 249, 243, 0.76);
  border-color: rgba(142, 63, 29, 0.14);
}

.hero-card,
.calc-form,
.result-card,
.example-card,
.category-card,
.article-card,
.faq-list article,
.formula-card {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid rgba(99, 74, 57, 0.1);
  background: var(--panel);
}

.metric-tag {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 700;
}

.hero-stat {
  margin: 14px 0 6px;
  font-size: clamp(2.2rem, 12vw, 3.6rem);
  line-height: 1;
}

.stat-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.quick-nav-grid,
.example-grid,
.content-stack,
.faq-list,
.formula-list,
.category-grid,
.article-grid {
  gap: 12px;
}

.quick-nav-grid a {
  display: block;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(99, 74, 57, 0.1);
  color: var(--text);
  font-weight: 700;
}

.calculator-grid {
  grid-template-columns: 1fr;
  gap: 14px;
}

.calc-form {
  display: grid;
  gap: 16px;
}

.calc-form label span,
.gender-select legend,
.result-item span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.92rem;
  font-weight: 700;
}

.input-wrap {
  display: flex;
  align-items: center;
  border-radius: 16px;
  border: 1px solid rgba(99, 74, 57, 0.18);
  background: rgba(255, 255, 255, 0.8);
  overflow: hidden;
}

.input-wrap input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 15px 16px;
  color: var(--text);
  font-size: 16px;
}

.input-wrap em {
  padding: 0 16px;
  color: var(--muted);
  font-style: normal;
  font-weight: 700;
}

.gender-select {
  margin: 0;
  padding: 0;
  border: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.gender-select legend {
  width: 100%;
}

.radio-pill {
  position: relative;
}

.radio-pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-pill span {
  display: inline-flex;
  min-width: 84px;
  justify-content: center;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid rgba(99, 74, 57, 0.16);
  background: rgba(255, 255, 255, 0.8);
  cursor: pointer;
}

.radio-pill input:checked + span {
  color: #fff8f2;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
}

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

.chip-button {
  cursor: pointer;
}

.full {
  width: 100%;
}

.form-note {
  margin: 0;
  font-size: 0.88rem;
}

.result-card {
  display: grid;
  gap: 14px;
}

.result-main {
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.result-item {
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(99, 74, 57, 0.08);
}

.result-item strong {
  display: block;
  font-size: 1.08rem;
  line-height: 1.35;
}

.result-item.wide {
  grid-column: 1 / -1;
}

.result-tip {
  padding: 14px 16px;
  border-left: 4px solid var(--accent-soft);
  background: rgba(244, 226, 201, 0.34);
  border-radius: 0 14px 14px 0;
}

.table-card {
  overflow-x: auto;
  margin-bottom: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
}

.table-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 13px 14px;
  min-width: 340px;
  background: rgba(255, 255, 255, 0.76);
}

.table-row + .table-row {
  border-top: 1px solid rgba(99, 74, 57, 0.08);
}

.table-head {
  background: rgba(244, 226, 201, 0.72);
  font-weight: 700;
}

.three-col {
  grid-template-columns: 82px 1.2fr 1fr;
}

.article-panel p:last-child {
  margin-bottom: 0;
}

.faq-list article {
  display: grid;
  gap: 10px;
}

.category-grid,
.article-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.category-card,
.article-card {
  display: grid;
  gap: 8px;
  color: var(--text);
  text-decoration: none;
}

.draft-card {
  opacity: 0.76;
}

.category-card strong,
.article-card h3 {
  font-size: 1.02rem;
  line-height: 1.35;
  margin: 0;
}

.category-card span,
.article-card p {
  color: var(--muted);
  line-height: 1.72;
  margin: 0;
}

.compact-hero h1 {
  font-size: clamp(2rem, 9vw, 3.2rem);
}

.featured-articles {
  margin-top: 14px;
}

.article-page {
  display: grid;
  gap: 14px;
}

.summary-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.summary-item,
.tip-box {
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(99, 74, 57, 0.08);
}

.summary-item span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.summary-item strong,
.tip-box strong {
  display: block;
  font-size: 1rem;
  line-height: 1.45;
}

.tip-box p {
  margin: 8px 0 0;
}

.article-page h2 {
  margin: 8px 0 0;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.article-meta a {
  color: var(--accent-deep);
  text-decoration: none;
}

.status-normal strong,
.status-normal #status-text {
  color: var(--success);
}

.status-warning strong,
.status-warning #status-text {
  color: var(--warning);
}

.status-danger strong,
.status-danger #status-text {
  color: var(--danger);
}

.mobile-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, rgba(245, 239, 228, 0), rgba(245, 239, 228, 0.95) 35%, rgba(245, 239, 228, 1) 100%);
}

.mobile-cta .button {
  width: 100%;
}

@media (min-width: 760px) {
  .page-shell {
    width: min(100% - 32px, 1120px);
    padding-top: 20px;
    padding-bottom: 56px;
  }

  .hero,
  .panel {
    padding: 24px;
  }

  .hero-grid,
  .calculator-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  }

  .hero-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

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

  .content-stack,
  .faq-list,
  .example-grid,
  .category-grid,
  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .mobile-cta {
    display: none;
  }
}

@media (min-width: 980px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.88fr);
  }

  .content-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .quick-nav-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .category-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}