/* =============================================
   鼻腔冲洗原理与应用 — 独立页面样式
   ============================================= */

/* --- Page Hero --- */
.science-hero {
  background: linear-gradient(135deg, #0B7A6E 0%, #149C8E 30%, #1A5C54 100%);
  padding: 120px 0 64px;
  text-align: center;
  color: #fff;
}
.science-hero__eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.75;
  margin-bottom: 12px;
}
.science-hero__title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.35;
}
.science-hero__desc {
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto;
  opacity: 0.85;
  line-height: 1.6;
}

/* --- Table of Contents --- */
.science-toc {
  background: #F5FAF9;
  border-bottom: 1px solid #D4EBE8;
  padding: 32px 0;
}
.science-toc__title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
  letter-spacing: 0.06em;
}
.science-toc__list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
}
.science-toc__list li { counter-increment: toc-item; }
.science-toc__list a {
  font-size: 0.85rem;
  color: var(--color-text);
  text-decoration: none;
  padding: 4px 0;
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.science-toc__list a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* --- Main Content --- */
.science-content {
  padding: 64px 0;
  background: #fff;
}

/* --- Section Layout --- */
.science-section {
  margin-bottom: 72px;
  position: relative;
}
.science-section__num {
  font-family: 'Noto Serif SC', serif;
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary-light);
  opacity: 0.35;
  position: absolute;
  top: -16px;
  left: -64px;
  line-height: 1;
  pointer-events: none;
}
.science-section__title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: #0B3A35;
  margin-bottom: 12px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}
.science-section__lead {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 800px;
}

/* --- Science Cards (Section 1) --- */
.science-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}
.science-card {
  background: #F7FBFA;
  border: 1px solid #E2F0ED;
  border-radius: 12px;
  padding: 24px;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.science-card:hover { box-shadow: 0 4px 20px rgba(11,122,110,0.08); border-color: var(--color-primary); }
.science-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.science-card p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}
.science-card__tag {
  font-size: 0.7rem;
  color: #999;
  letter-spacing: 0.03em;
}

/* --- Quote Block --- */
.science-quote {
  background: linear-gradient(135deg, #F0F9F7 0%, #E8F5F3 100%);
  border-left: 4px solid var(--color-primary);
  padding: 20px 24px;
  border-radius: 0 10px 10px 0;
  margin: 28px 0;
}
.science-quote p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: #2D5A54;
  margin: 0;
}

/* --- Applications Grid --- */
.science-applications {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}
.science-app {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color var(--transition);
}
.science-app:hover { border-color: var(--color-primary); }
.science-app strong {
  display: block;
  font-size: 0.92rem;
  color: var(--color-primary);
  margin-bottom: 6px;
}
.science-app p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}

/* --- Compare Block --- */
.science-compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}
.science-compare__item {
  padding: 24px;
  border-radius: 12px;
  border: 1px solid #D4EBE8;
  background: #FAFDFC;
}
.science-compare__item--bad {
  background: #FFFAF5;
  border-color: #F0D5C0;
}
.science-compare__icon {
  font-size: 1.4rem;
  margin-bottom: 10px;
}
.science-compare__item h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #0B3A35;
}
.science-compare__item p {
  font-size: 0.84rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Steps --- */
.science-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}
.science-step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background: #FAFDFC;
  border-radius: 10px;
  border: 1px solid #E2F0ED;
}
.science-step__num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
}
.science-step strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 4px;
  color: #0B3A35;
}
.science-step p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Mediators --- */
.science-mediators {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.science-mediator {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
}
.science-mediator__label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  background: #FFF3E0;
  color: #E8913A;
  padding: 4px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}
.science-mediator p {
  font-size: 0.84rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}

/* --- Tonicity --- */
.science-tonicity {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 20px;
}
.science-tonicity__col { border-radius: 12px; overflow: hidden; }
.science-tonicity__label {
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 20px;
  margin: 0;
  color: #fff;
}
.science-tonicity__label--iso { background: var(--color-primary); }
.science-tonicity__label--hyper { background: #E8913A; }
.science-tonicity__features { padding: 20px; background: #FAFDFC; border: 1px solid #E2F0ED; border-top: none; }
.science-tonicity__feature {
  padding: 12px 0;
  border-bottom: 1px solid #E8EFED;
}
.science-tonicity__feature:last-child { border-bottom: none; }
.science-tonicity__feature strong {
  display: block;
  font-size: 0.85rem;
  color: #0B3A35;
  margin-bottom: 4px;
}
.science-tonicity__feature p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Warning box --- */
.science-warning {
  background: #FFF8F0;
  border: 1px solid #F0D5C0;
  border-radius: 0 0 12px 12px;
  padding: 16px 20px;
}
.science-warning strong {
  font-size: 0.82rem;
  color: #C1691A;
  display: block;
  margin-bottom: 6px;
}
.science-warning p {
  font-size: 0.78rem;
  color: #A06040;
  line-height: 1.5;
  margin: 0;
}

/* --- Micro environment --- */
.science-micro {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.science-micro__item {
  background: #F7FBFA;
  border-radius: 12px;
  padding: 24px;
  border: 1px solid #E2F0ED;
}
.science-micro__item h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.science-micro__item p {
  font-size: 0.83rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}

/* --- Post-op --- */
.science-postop__risk {
  background: #FFF5F5;
  border: 1px solid #F5D5D5;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 24px;
}
.science-postop__risk h4 { font-size: 0.9rem; color: #C0392B; margin-bottom: 8px; }
.science-postop__risk p { font-size: 0.84rem; color: #A04040; line-height: 1.55; margin: 0; }
.science-postop__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.science-postop__item {
  background: #FAFDFC;
  border: 1px solid #E2F0ED;
  border-radius: 10px;
  padding: 20px;
  text-align: center;
}
.science-postop__icon {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--color-primary);
  color: #fff;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 10px;
}
.science-postop__item h4 {
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: #0B3A35;
}
.science-postop__item p {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Guideline --- */
.science-guideline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}
.science-guideline__item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  border-top: 3px solid var(--color-primary);
}
.science-guideline__item h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.science-guideline__item p {
  font-size: 0.83rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}
.science-callout {
  background: linear-gradient(135deg, #F0F9F7, #E8F5F3);
  border-radius: 10px;
  padding: 20px 24px;
  text-align: center;
}
.science-callout p { font-size: 0.9rem; color: #2D5A54; margin: 0; line-height: 1.6; }

/* --- Essence --- */
.science-essence { max-width: 800px; }
.science-essence__flow { display: flex; flex-direction: column; gap: 14px; }
.science-essence__step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  background: #FAFDFC;
  border-radius: 10px;
  border: 1px solid #E2F0ED;
}
.science-essence__dot {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.science-essence__step strong {
  flex-shrink: 0;
  min-width: 100px;
  font-size: 0.85rem;
  color: #0B3A35;
}
.science-essence__step p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Factors --- */
.science-factors {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.science-factor {
  display: flex;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #fff;
}
.science-factor__num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 700;
}
.science-factor h4 {
  font-size: 0.9rem;
  color: #0B3A35;
  margin-bottom: 6px;
}
.science-factor p {
  font-size: 0.83rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}

/* --- Evidence --- */
.science-evidence {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}
.science-evidence__item {
  background: #FAFDFC;
  border: 1px solid #E2F0ED;
  border-radius: 10px;
  padding: 20px;
}
.science-evidence__item strong {
  display: block;
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 6px;
}
.science-evidence__item p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Formulas --- */
.science-formulas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 16px;
}
.science-formula {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
}
.science-formula h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: #0B3A35;
  margin-bottom: 8px;
}
.science-formula h4 span {
  font-size: 0.7rem;
  font-weight: 500;
  color: #999;
  margin-left: 6px;
}
.science-formula p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Tech comparison --- */
.science-tech {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 16px 0 28px;
}
.science-tech__item {
  background: #FAFDFC;
  border: 1px solid #E2F0ED;
  border-radius: 10px;
  padding: 20px;
}
.science-tech__item h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.science-tech__item p {
  font-size: 0.83rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}
.science-tech__item--vs {
  background: #FFFBF5;
  border-color: #F0E0C0;
}
.science-tech__item--vs h4 { color: #999; }

/* --- CTA Section --- */
.science-cta {
  background: linear-gradient(135deg, #0B7A6E, #149C8E);
  padding: 64px 0;
  text-align: center;
  color: #fff;
}
.science-cta h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.science-cta p {
  font-size: 0.95rem;
  opacity: 0.85;
  margin-bottom: 28px;
}
.science-cta__actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- h3 inside sections --- */
.science-section h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #0B3A35;
  margin: 32px 0 16px;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .science-section__num { display: none; }
  .science-cards,
  .science-mediators,
  .science-micro,
  .science-guideline,
  .science-postop__grid,
  .science-formulas { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .science-hero { padding: 100px 0 48px; }
  .science-hero__title { font-size: 2rem; }
  .science-content { padding: 40px 0; }
  .science-section { margin-bottom: 48px; }
  .science-section__title { font-size: 1.35rem; }

  .science-cards,
  .science-mediators,
  .science-micro,
  .science-guideline,
  .science-postop__grid,
  .science-formulas { grid-template-columns: 1fr; }
  .science-applications { grid-template-columns: 1fr; }
  .science-compare { grid-template-columns: 1fr; }
  .science-tonicity { grid-template-columns: 1fr; }
  .science-tech { grid-template-columns: 1fr; }
  .science-evidence { grid-template-columns: 1fr; }
  .science-toc__list { flex-direction: column; gap: 2px; }

  .science-essence__step { flex-direction: column; gap: 6px; }
  .science-essence__step strong { min-width: auto; }
  .science-factor { flex-direction: column; gap: 10px; }
}

@media (max-width: 480px) {
  .science-hero__title { font-size: 1.6rem; }
  .science-hero__desc { font-size: 0.9rem; }
  .science-cta h2 { font-size: 1.4rem; }
}