:root {
  font-family: Inter, "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: #17212b;
  background: #f5f8fa;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; background: #f5f8fa; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.seo-wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.seo-nav {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid #dce4e9;
  background: #fff;
}
.seo-nav .seo-wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.seo-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 900; }
.seo-brand img { width: 38px; height: 38px; }
.seo-nav-links { display: flex; align-items: center; gap: 22px; color: #41515e; font-size: 14px; font-weight: 750; }
.seo-nav-links a:hover, .seo-text-link:hover { color: #006d8f; }
.seo-cta {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  color: #fff;
  background: #096b89;
  border-radius: 6px;
  font-weight: 850;
}

.seo-breadcrumb { padding: 22px 0 0; color: #64727d; font-size: 13px; }
.seo-breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.seo-breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 8px; color: #9ba8b1; }

.seo-hero {
  min-height: 560px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.78fr);
  align-items: center;
  gap: 54px;
  padding: 46px 0 66px;
}
.seo-kicker { margin: 0 0 14px; color: #087a77; font-size: 14px; font-weight: 900; }
.seo-hero h1 { max-width: 760px; margin: 0; font-size: clamp(40px, 5vw, 66px); line-height: 1.08; letter-spacing: 0; }
.seo-lead { max-width: 720px; margin: 22px 0 0; color: #4d5d68; font-size: 18px; line-height: 1.85; }
.seo-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.seo-secondary {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid #b8c8d2;
  border-radius: 6px;
  background: #fff;
  font-weight: 800;
}
.seo-hero-media { overflow: hidden; border: 1px solid #ccd8df; border-radius: 8px; background: #eaf0f3; }
.seo-hero-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.seo-hero-media figcaption { padding: 12px 14px; color: #596975; background: #fff; font-size: 13px; line-height: 1.55; }

.seo-band { border-top: 1px solid #dfe7eb; background: #fff; }
.seo-section { padding: 70px 0; }
.seo-section h2 { max-width: 800px; margin: 0; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.18; letter-spacing: 0; }
.seo-section-intro { max-width: 820px; margin: 16px 0 0; color: #53636e; line-height: 1.85; }
.seo-grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; margin-top: 38px; }
.seo-grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 54px; margin-top: 38px; }
.seo-point { padding-top: 16px; border-top: 3px solid #15a39b; }
.seo-point b { display: block; margin-bottom: 9px; color: #162630; font-size: 19px; }
.seo-point p { margin: 0; color: #596a75; line-height: 1.75; }
.seo-step { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 14px; align-items: start; }
.seo-step span { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: #173d4a; border-radius: 50%; font-weight: 900; }
.seo-step h3 { margin: 2px 0 7px; font-size: 19px; }
.seo-step p { margin: 0; color: #5a6973; line-height: 1.72; }

.seo-example { margin-top: 34px; padding: 24px; border: 1px solid #cdd9df; border-left: 5px solid #096b89; background: #f8fbfc; }
.seo-example b { display: block; margin-bottom: 10px; color: #0b5c75; }
.seo-example p { margin: 0; color: #334650; line-height: 1.75; overflow-wrap: anywhere; }
.seo-faq { margin-top: 34px; border-top: 1px solid #dbe4e8; }
.seo-faq details { padding: 22px 0; border-bottom: 1px solid #dbe4e8; }
.seo-faq summary { color: #172832; font-size: 18px; font-weight: 850; cursor: pointer; }
.seo-faq p { max-width: 880px; margin: 14px 0 0; color: #586873; line-height: 1.8; }

.seo-related { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.seo-related a { padding: 10px 13px; border: 1px solid #becdd5; border-radius: 5px; background: #fff; color: #24404d; font-weight: 750; }
.prompt-tool {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
  gap: 30px;
  padding: 34px 0 72px;
}
.prompt-controls, .prompt-output { min-width: 0; }
.prompt-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.prompt-field { min-width: 0; display: grid; gap: 8px; }
.prompt-field.full { grid-column: 1 / -1; }
.prompt-field > span, .prompt-output > span { color: #233944; font-size: 13px; font-weight: 850; }
.prompt-field input, .prompt-field select, .prompt-field textarea, .prompt-output textarea {
  width: 100%;
  min-height: 46px;
  padding: 11px 12px;
  color: #172832;
  background: #fff;
  border: 1px solid #b9c9d2;
  border-radius: 6px;
  outline: 0;
}
.prompt-field textarea { min-height: 88px; resize: vertical; }
.prompt-field input:focus, .prompt-field select:focus, .prompt-field textarea:focus, .prompt-output textarea:focus {
  border-color: #087a77;
  box-shadow: 0 0 0 3px rgba(8, 122, 119, 0.12);
}
.prompt-ratios { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.prompt-ratios label { position: relative; }
.prompt-ratios input { position: absolute; opacity: 0; pointer-events: none; }
.prompt-ratios span { min-height: 40px; display: grid; place-items: center; padding: 0 8px; color: #42545f; background: #fff; border: 1px solid #becdd5; border-radius: 5px; font-size: 13px; font-weight: 800; cursor: pointer; }
.prompt-ratios input:checked + span { color: #fff; background: #173d4a; border-color: #173d4a; }
.prompt-output { align-self: stretch; display: grid; align-content: start; gap: 12px; padding: 22px; background: #e9f1f3; border: 1px solid #c5d4db; border-radius: 8px; }
.prompt-output textarea { min-height: 288px; resize: vertical; line-height: 1.75; }
.prompt-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.prompt-actions button { min-height: 42px; padding: 0 18px; color: #173d4a; background: #fff; border: 1px solid #aebfc8; border-radius: 6px; font: inherit; font-weight: 850; cursor: pointer; }
.prompt-actions button:hover { border-color: #087a77; }
.guide-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; color: #687681; font-size: 13px; }
.guide-body { max-width: 820px; padding-bottom: 72px; }
.guide-body h2 { margin: 58px 0 16px; font-size: 32px; line-height: 1.25; }
.guide-body h3 { margin: 30px 0 12px; font-size: 21px; }
.guide-body p, .guide-body li { color: #465963; font-size: 16px; line-height: 1.9; }
.guide-body ul, .guide-body ol { padding-left: 24px; }
.guide-body figure { margin: 34px 0; }
.guide-body figure img { width: 100%; max-height: 540px; object-fit: cover; border: 1px solid #ccd8df; border-radius: 8px; }
.guide-body figcaption { margin-top: 10px; color: #6c7880; font-size: 13px; }
.trust-content { max-width: 820px; padding: 42px 0 76px; }
.trust-content h1 { margin: 0; font-size: clamp(40px, 5vw, 58px); line-height: 1.1; }
.trust-content h2 { margin: 46px 0 14px; font-size: 26px; }
.trust-content p, .trust-content li { color: #4e606a; line-height: 1.88; }
.trust-content a { color: #087a77; text-decoration: underline; text-underline-offset: 3px; }
.seo-footer { padding: 38px 0; color: #62717b; border-top: 1px solid #d8e1e6; background: #edf3f5; font-size: 13px; }
.seo-footer .seo-wrap { display: flex; justify-content: space-between; gap: 26px; }
.seo-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }

@media (max-width: 820px) {
  .seo-wrap { width: min(100% - 28px, 1120px); }
  .seo-nav-links a:not(.seo-cta) { display: none; }
  .seo-hero { min-height: 0; grid-template-columns: 1fr; gap: 32px; padding: 38px 0 50px; }
  .seo-hero h1 { font-size: 40px; }
  .seo-grid-3, .seo-grid-2 { grid-template-columns: 1fr; gap: 24px; }
  .prompt-tool { grid-template-columns: 1fr; }
  .prompt-controls { grid-template-columns: 1fr; }
  .prompt-field.full { grid-column: auto; }
  .prompt-ratios { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-section { padding: 52px 0; }
  .seo-footer .seo-wrap { flex-direction: column; }
}