/* ImageTwin 图片查重 — 原创版式，墨绿主色，学术可信 */
:root {
  --teal: #0d9488;
  --teal-dark: #0f766e;
  --teal-light: #ccfbf1;
  --teal-muted: rgba(13, 148, 136, .08);
  --text: #1e293b;
  --text-muted: #64748b;
  --bg: #fff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --wrap: min(1100px, 100vw - 48px);
  --radius: 6px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 720px; }
.wrap-wide { max-width: 100%; }
.text-center { text-align: center; }
.trusted-lead { margin: 0 auto 0; font-size: 1rem; line-height: 1.7; color: var(--text-muted); max-width: 560px; }

/* 机构 logo 静态一排展示 */
.logo-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 32px 48px;
  margin-top: 28px;
}
.logo-row-item {
  flex-shrink: 0;
  width: 120px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-row-item img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: grayscale(100%) opacity(0.75);
  transition: filter 0.2s;
}
.logo-row-item:hover img {
  filter: grayscale(0%) opacity(1);
}

/* ----- Header：简洁顶栏 ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--teal-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--teal);
}
.logo-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}
.logo-text {
  line-height: 1;
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color .2s;
}
.nav a:hover { color: var(--teal-dark); }
.nav .btn { color: #fff; }
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
}
.nav-toggle span { display: block; height: 2px; background: currentColor; border-radius: 1px; }
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav a:last-of-type { border-bottom: none; }
}

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.btn-primary {
  background: var(--teal);
  color: #fff;
}
.btn-primary:hover { background: var(--teal-dark); }
.btn-secondary {
  background: transparent;
  color: var(--teal-dark);
  border-color: var(--teal);
}
.btn-secondary:hover { background: var(--teal-muted); }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-block { width: 100%; margin-top: 16px; }

/* ----- Hero：左文字右图片 ----- */
.banner {
  padding: 56px 0 48px;
  background: var(--bg-alt);
}
.banner-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.banner-content { text-align: left; }
.banner-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--text);
  margin: 0 0 16px;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.banner-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin: 0 0 24px;
  line-height: 1.6;
}
.cta-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.banner-note { margin-top: 16px; font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; }
.banner-note-price {
  display: inline-block;
  margin-top: 6px;
  padding: 2px 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--teal-dark);
  background: #eef7f5;
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: 999px;
}
.banner-hero {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg);
}
.banner-hero img { width: 100%; height: auto; display: block; vertical-align: top; }
@media (max-width: 768px) {
  .banner-inner { grid-template-columns: 1fr; gap: 32px; }
  .banner-content { text-align: center; }
  .cta-buttons { justify-content: center; }
  .btn { width: 100%; max-width: 280px; }
}

/* ----- 区块通用 ----- */
.section {
  padding: 72px 0;
  background: var(--bg);
}
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 16px;
  text-align: center;
  letter-spacing: -0.02em;
}
.section-lead {
  font-size: 0.9375rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
  line-height: 1.6;
}
/* 完整方案：四宫格卡片，上图下文，对齐官网 ----- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s;
}
.solution-card:hover { border-color: var(--teal); }
.solution-card-img {
  aspect-ratio: 16/10;
  background: var(--bg-alt);
  overflow: hidden;
}
.solution-card-img img { width: 100%; height: 100%; object-fit: cover; }
.solution-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px;
  padding: 16px 16px 0;
}
.solution-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0 0 16px;
  padding: 0 16px;
}
@media (max-width: 900px) { .solution-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .solution-grid { grid-template-columns: 1fr; } }
/* 为什么选择 ImageTwin：数字图标 + 文案 ----- */
.why-choose {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 32px;
  max-width: 800px;
  margin: 0 auto;
}
.why-choose-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.why-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.why-choose-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--teal-dark);
  margin: 0 0 4px;
}
.why-choose-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}
@media (max-width: 600px) {
  .why-choose { grid-template-columns: 1fr; }
}
.section-cta {
  background: var(--teal-dark);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.section-cta .section-title { color: #fff; }
.section-cta .cta-desc {
  color: rgba(255,255,255,.9);
  margin: 0 0 28px;
  font-size: 1rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.section-cta .btn-secondary { border-color: #fff; color: #fff; }
.section-cta .btn-secondary:hover { background: rgba(255,255,255,.12); }
.section-cta .cta-buttons { justify-content: center; }
.section-cta .cta-note { margin-top: 20px; font-size: 0.875rem; opacity: .85; }
@media (max-width: 768px) { .section-title { margin-bottom: 32px; font-size: 1.25rem; } }

/* ----- 卡片网格：轻量边框，无浮夸阴影 ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.card-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) {
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .card-grid-3 { grid-template-columns: 1fr; }
}
.card {
  background: var(--bg);
  padding: 28px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s, box-shadow .2s;
}
.card:hover {
  border-color: var(--teal);
  box-shadow: 0 2px 12px var(--teal-muted);
}
.card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--teal-dark);
  margin: 0 0 10px;
  text-align: center;
}
.card-tip {
  border-left: 3px solid var(--teal);
}
.card p { color: var(--text-muted); font-size: 0.9375rem; line-height: 1.6; margin: 0; }
.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
  line-height: 1;
}

/* ----- 价格方案：宽版单块，3 列特性 ----- */
.pricing-block {
  max-width: 820px;
  margin: 0 auto;
  padding: 28px 40px 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.pricing-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.pricing-price { flex-shrink: 0; }
.pricing-amount { font-size: 1.75rem; font-weight: 700; color: var(--teal); }
.pricing-unit { font-size: 0.9375rem; font-weight: 500; color: var(--text-muted); margin-left: 2px; }
.pricing-note { font-size: 0.875rem; color: var(--text-muted); margin: 0; }
.pricing-features {
  list-style: none;
  margin: 0;
  padding: 18px 0 22px;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.9;
}
.pricing-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 24px;
}
.pricing-features li { margin: 0; padding-left: 0; }
.pricing-features li::before { content: ""; }
@media (max-width: 768px) {
  .pricing-features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-block { padding: 24px 24px 28px; }
}
@media (max-width: 480px) {
  .pricing-features-grid { grid-template-columns: 1fr; }
}
.pricing-cta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.pricing-cta .btn { flex-shrink: 0; }
.pricing-tip { font-size: 0.8125rem; color: var(--text-muted); margin: 0; }
.alert-box {
  max-width: 560px;
  margin: 32px auto 0;
  padding: 16px 20px;
  background: var(--teal-muted);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.6;
}
.alert-box strong { color: var(--teal-dark); }
.alert-tip { background: #f0f9ff; border-left-color: #0284c7; }

/* ----- 对比表：墨绿表头 ----- */
.table-wrap { overflow-x: auto; margin: 0 auto; }
.comparison-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.9375rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.comparison-table th,
.comparison-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); }
.comparison-table th {
  background: var(--teal);
  color: #fff;
  font-weight: 600;
}
.comparison-table tbody tr:hover { background: var(--bg-alt); }
.highlight { color: var(--teal-dark); font-weight: 600; }

/* ----- 流程：横向四步+墨绿圆标 ----- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.step {
  text-align: center;
  padding: 0;
}
.step-number {
  width: 48px;
  height: 48px;
  background: var(--teal);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 auto 16px;
}
.step h3 { font-size: 1rem; margin: 0 0 8px; color: var(--text); }
.step p { margin: 0; font-size: 0.9375rem; color: var(--text-muted); line-height: 1.5; }
@media (max-width: 900px) { .process-steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .process-steps { grid-template-columns: 1fr; } }

/* ----- 数据：简洁数字行 ----- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 24px;
  text-align: center;
}
.stat-item { padding: 24px 16px; }
.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--teal);
  margin-bottom: 6px;
}
.stat-label { font-size: 0.875rem; color: var(--text-muted); }

/* ----- 用户评价：引用样式 ----- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 640px) {
  .testimonial-grid { grid-template-columns: 1fr; }
}
.testimonial {
  padding: 24px 28px;
  background: var(--bg);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.testimonial p { margin: 0; color: var(--text); font-size: 0.9375rem; line-height: 1.7; }
.testimonial-author { font-size: 0.875rem; font-weight: 600; color: var(--teal-dark); margin-top: 12px; }

/* ----- FAQ：列表式 ----- */
.faq-list { margin: 0; padding: 0; }
.faq-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.faq-item:last-child { border-bottom: none; }
.faq-item dt {
  font-size: 1rem;
  font-weight: 600;
  color: var(--teal-dark);
  margin: 0 0 8px;
}
.faq-item dd { margin: 0; font-size: 0.9375rem; color: var(--text-muted); line-height: 1.65; }

/* ----- 页脚：深墨绿 ----- */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 48px 0 28px;
}
.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 40px;
  margin-bottom: 36px;
}
.footer-section h3 { font-size: 0.9375rem; font-weight: 600; color: var(--teal-light); margin: 0 0 12px; }
.footer-section p, .footer-section ul { margin: 0; font-size: 0.9375rem; line-height: 1.7; }
.footer-section ul { list-style: none; padding: 0; }
.footer-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1rem;
}
.footer-links-row li { margin: 0; }
.footer-section a { color: #94a3b8; text-decoration: none; transition: color .2s; }
.footer-section a:hover { color: var(--teal-light); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #334155;
  text-align: center;
  font-size: 0.8125rem;
  color: #64748b;
}
.footer-bottom p { margin: 4px 0; }

/* ----- 文章列表与详情 ----- */
.main-content { min-height: 60vh; }
.page-title { font-size: 1.5rem; font-weight: 700; color: var(--text); margin: 0 0 8px; }
.page-lead { font-size: 0.9375rem; color: var(--text-muted); margin: 0 0 32px; line-height: 1.6; }
.article-list { display: flex; flex-direction: column; gap: 24px; }
.article-list-empty { text-align: center; color: var(--text-muted); padding: 48px 0; }
.article-card {
  padding: 24px 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  border-left: 4px solid var(--teal);
}
.article-card-title { font-size: 1.125rem; font-weight: 600; margin: 0 0 8px; line-height: 1.4; }
.article-card-title a { color: var(--text); text-decoration: none; }
.article-card-title a:hover { color: var(--teal); }
.article-card-date { font-size: 0.8125rem; color: var(--text-muted); margin: 0 0 12px; }
.article-card-excerpt { font-size: 0.9375rem; color: var(--text-muted); margin: 0 0 16px; line-height: 1.65; }
.article-card-more { font-size: 0.875rem; font-weight: 600; color: var(--teal); text-decoration: none; }
.article-card-more:hover { text-decoration: underline; }
/* ----- 文章详情页：主栏 + 侧栏 ----- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px 40px;
  padding: 32px 24px 72px;
  align-items: start;
}
@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; }
}
.article-detail { padding: 0; }
.article-detail-single { max-width: 720px; margin: 0 auto; padding: 48px 0; }
.article-detail-main { min-width: 0; }
.article-back { display: inline-block; font-size: 0.875rem; color: var(--teal); margin-bottom: 20px; text-decoration: none; }
.article-back:hover { text-decoration: underline; }
.article-title { font-size: 1.5rem; font-weight: 700; color: var(--text); margin: 0 0 12px; line-height: 1.35; }
.article-date { font-size: 0.875rem; color: var(--text-muted); margin: 0 0 28px; display: block; }
.article-content {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
}
.article-content p { margin: 0 0 1em; }
.article-content p:last-child { margin-bottom: 0; }
.article-content h2 { font-size: 1.25rem; margin: 1.5em 0 0.5em; color: var(--teal-dark); }
.article-content h3 { font-size: 1.0625rem; margin: 1.25em 0 0.5em; color: var(--text); }
.article-content ul, .article-content ol { margin: 0 0 1em; padding-left: 1.5em; }
.article-content blockquote { margin: 1em 0; padding: 0.5em 0 0.5em 1em; border-left: 4px solid var(--teal); color: var(--text-muted); background: var(--bg-alt); border-radius: 0 var(--radius) var(--radius) 0; }
.article-content a { color: var(--teal); text-decoration: none; }
.article-content a:hover { text-decoration: underline; }
.article-content img { max-width: 100%; height: auto; border-radius: var(--radius); }

/* 上一篇下一篇 */
.article-nav-adjacent {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.article-nav-prev, .article-nav-next {
  padding: 12px 16px;
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.article-nav-next { text-align: right; }
.article-nav-label { display: block; font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.article-nav-prev a, .article-nav-next a { font-size: 0.9375rem; color: var(--text); text-decoration: none; }
.article-nav-prev a:hover, .article-nav-next a:hover { color: var(--teal); }
.article-nav-none { font-size: 0.875rem; color: var(--text-muted); }
@media (max-width: 560px) {
  .article-nav-adjacent { grid-template-columns: 1fr; }
}

/* 侧栏 */
.article-sidebar { position: sticky; top: 84px; }
.sidebar-widget {
  margin-bottom: 28px;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.sidebar-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--teal-dark);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--teal);
}
.sidebar-list { list-style: none; margin: 0; padding: 0; }
.sidebar-list li { margin: 0 0 12px; padding: 0; }
.sidebar-list li:last-child { margin-bottom: 0; }
.sidebar-list a {
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: none;
  display: block;
  line-height: 1.45;
}
.sidebar-list a:hover { color: var(--teal); }
.sidebar-list time {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.sidebar-list-num .num {
  display: inline-block;
  width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--teal);
  color: #fff;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}
.sidebar-list-num li { display: flex; align-items: center; margin-bottom: 10px; }
.sidebar-empty { font-size: 0.875rem; color: var(--text-muted); margin: 0; }
.sidebar-back { margin-bottom: 0; }

.article-loading, .article-notfound { text-align: center; padding: 48px 0; color: var(--text-muted); }
.article-notfound .btn { margin-top: 16px; }

/* ----- 右侧隐藏式联系方式 ----- */
.contact-drawer {
  position: fixed;
  right: 0;
  top: 58%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: row-reverse;
  align-items: stretch;
  z-index: 998;
}
.contact-drawer-tab {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: var(--teal);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 12px 8px;
  display: inline-block;
  min-width: auto;
  border-radius: 8px 0 0 8px;
  box-shadow: 0 2px 10px rgba(2, 30, 44, 0.15);
}
.contact-drawer-body {
  width: 170px;
  background: #fff;
  border: 1px solid var(--border);
  border-right: 0;
  border-radius: 8px 0 0 8px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.12);
  padding: 12px 14px;
  transform: translateX(172px);
  opacity: 0;
  pointer-events: none;
  transition: transform .25s ease, opacity .2s ease;
}
.contact-drawer:hover .contact-drawer-body,
.contact-drawer:focus-within .contact-drawer-body {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}
.contact-drawer-body p {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  color: var(--text);
  line-height: 1.5;
  white-space: nowrap;
}
.contact-drawer-body p:last-child { margin-bottom: 0; }
@media (max-width: 768px) {
  .contact-drawer {
    top: auto;
    bottom: 82px;
    transform: none;
  }
}

/* ----- 返回顶部 ----- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--teal);
  color: #fff;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  transition: background .2s, transform .2s;
  z-index: 999;
}
.back-to-top:hover { background: var(--teal-dark); color: #fff; transform: translateY(-2px); }
.back-to-top.show { display: flex; }