:root {
  --color-primary: #0B5C9A;
  --color-primary-dark: #083F6B;
  --color-primary-tint: #EAF3FB;
  --color-accent: #F59E0B;
  --color-ink: #111827;
  --color-body: #1F2937;
  --color-muted: #6B7280;
  --color-border: #7D8899;
  --color-divider: #E5E7EB;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F9FC;
  --color-success: #15803D;
  --color-warning: #B45309;
  --color-danger: #B91C1C;

  --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --fs-12: 12px;
  --fs-14: 14px;
  --fs-16: 16px;
  --fs-18: 18px;
  --fs-20: 20px;
  --fs-24: 24px;
  --fs-30: 30px;
  --fs-36: 36px;
  --fs-44: 44px;
  --fs-56: 56px;

  --lh-body: 1.7;
  --lh-heading: 1.25;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;

  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-6: 24px;
  --s-8: 32px;
  --s-12: 48px;
  --s-16: 64px;
  --s-24: 96px;
  --s-32: 128px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(11, 92, 154, 0.08);
  --shadow-md: 0 4px 12px rgba(11, 92, 154, 0.10);
  --shadow-lg: 0 12px 32px rgba(11, 92, 154, 0.14);

  --container: 1200px;
  --gutter: 24px;
  --dur-fast: 180ms;
  --dur-base: 260ms;
  --dur-slow: 480ms;
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dist-xs: 4px;
  --dist-md: 16px;
}
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  line-height: var(--lh-body);
  color: var(--color-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { color: var(--color-ink); line-height: var(--lh-heading); margin: 0 0 var(--s-4); font-weight: var(--fw-bold); }
h1 { font-size: var(--fs-36); }
h2 { font-size: var(--fs-30); }
h3 { font-size: var(--fs-20); }
h4 { font-size: var(--fs-18); }
p { margin: 0 0 var(--s-4); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0 0 var(--s-4); padding-left: 1.25em; }
li { margin-bottom: var(--s-2); }

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--s-4); }
@media (min-width: 768px) { .container { padding-inline: var(--gutter); } }

.section { padding-block: var(--s-16); }
.section--alt { background: var(--color-bg-alt); }
.section--tint { background: var(--color-primary-tint); }
@media (min-width: 1024px) { .section { padding-block: var(--s-24); } }

.section__head { max-width: 720px; margin-bottom: var(--s-8); }
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--s-2);
}
.section__title { font-size: var(--fs-24); margin-bottom: var(--s-3); }
.section__lead { color: var(--color-muted); margin: 0; }
@media (min-width: 768px) { .section__title { font-size: var(--fs-30); } }

.grid { display: grid; gap: var(--s-6); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) { .grid--3 { grid-template-columns: repeat(3, 1fr); } .grid--4 { grid-template-columns: repeat(4, 1fr); } }

.stack > * + * { margin-top: var(--s-4); }
.muted { color: var(--color-muted); }
.mono { font-family: var(--font-mono); }
.numeric { font-variant-numeric: tabular-nums; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: 48px; padding: 0 var(--s-6);
  font: inherit; font-size: var(--fs-16); font-weight: var(--fw-medium);
  border-radius: var(--radius-md); border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--secondary { background: #fff; color: var(--color-ink); border-color: var(--color-border); }
.btn--secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--text { background: none; color: var(--color-primary); padding-inline: var(--s-2); min-height: 40px; }
.btn--sm { min-height: 40px; font-size: var(--fs-14); padding-inline: var(--s-4); }
.btn[disabled] { opacity: 0.6; cursor: not-allowed; }

.card {
  display: flex; flex-direction: column; gap: var(--s-3);
  padding: var(--s-6); background: #fff;
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 200ms ease-out, border-color 200ms ease-out, transform 200ms ease-out;
}
a.card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); text-decoration: none; }
.card__title { font-size: var(--fs-18); margin: 0; }
.card__text { color: var(--color-muted); margin: 0; font-size: var(--fs-14); }
.card__link { font-size: var(--fs-14); font-weight: var(--fw-medium); }
.card__meta { margin: 0; color: var(--color-muted); font-size: var(--fs-12); line-height: 1.55; }
.card__disclosure { margin: 0; font-size: var(--fs-12); color: var(--color-warning); }
.card__thumb { margin: calc(var(--s-6) * -1) calc(var(--s-6) * -1) var(--s-2); border-radius: var(--radius-md) var(--radius-md) 0 0; overflow: hidden; }
.card__thumb { display: grid; place-items: center; background: var(--color-bg-alt); }
.card__thumb img { width: 100%; aspect-ratio: 16 / 9; object-fit: contain; }

.tag {
  display: inline-block; padding: 2px var(--s-3);
  font-size: var(--fs-12); font-weight: var(--fw-medium);
  color: var(--color-primary-dark); background: var(--color-primary-tint);
  border-radius: var(--radius-pill);
}
.tag--accent { color: var(--color-ink); background: var(--color-accent); }

.hero { background: var(--color-primary-tint); background-image: linear-gradient(135deg, rgba(255,255,255,.72), transparent 55%), linear-gradient(rgba(11,92,154,.06) 1px,transparent 1px), linear-gradient(90deg,rgba(11,92,154,.06) 1px,transparent 1px); background-size:auto,32px 32px,32px 32px; padding-block: var(--s-16); }
html.js [data-reveal] { opacity: 0; transform: translateY(var(--dist-md)); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
html.js [data-reveal].is-in { opacity: 1; transform: none; }
html.js [data-reveal]:nth-child(2) { transition-delay: 70ms; }
html.js [data-reveal]:nth-child(3) { transition-delay: 140ms; }
html.js [data-reveal]:nth-child(4) { transition-delay: 210ms; }
.btn:active { transform: translateY(var(--dist-xs)); }
.hero__inner { display: grid; gap: var(--s-8); align-items: center; }
@media (min-width: 1024px) { .hero__inner { grid-template-columns: 1.05fr 1fr; } }
.hero__title { font-size: var(--fs-36); margin-bottom: var(--s-4); }
.hero__stages { gap: var(--s-3); }
@media (min-width: 768px) { .hero__title { font-size: var(--fs-44); } }
@media (min-width: 1024px) { .hero__title { font-size: var(--fs-56); } }
.hero__lead { font-size: var(--fs-18); color: var(--color-body); max-width: 56ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-6); }
.fde-hero .hero__lead { max-width: 62ch; }
.fde-hero__brief { border-top: 4px solid var(--color-accent); }
.metric-note { max-width: 76ch; margin: var(--s-8) 0 0; padding-left: var(--s-4); border-left: 3px solid var(--color-accent); color: var(--color-muted); font-size: var(--fs-14); }
.value-grid .card { height: 100%; }

.workbench-preview { background: #09263f; color: #e9f2f9; }
.workbench-preview .section__title, .workbench-preview h3 { color: #fff; }
.workbench-preview .section__eyebrow { color: #7dd3fc; }
.workbench-preview .section__lead { color: #c7d9e8; max-width: 68ch; }
.workbench-preview__head { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--s-4); margin-bottom: var(--s-8); }
.workbench-preview__head > div { max-width: 760px; }
.workbench-preview__layout { align-items: stretch; }
.workbench-preview__story { padding: var(--s-8); border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-md); background: rgba(255,255,255,.06); }
.workbench-preview__story p { color: #c7d9e8; }
.workbench-preview__story .btn--primary { background: var(--color-accent); color: var(--color-ink); }
.workbench-preview__story .btn--primary:hover { background: #fbbf24; }
.workbench-module-grid { gap: var(--s-4); }
.workbench-module-grid .card { background: rgba(255,255,255,.96); box-shadow: none; }
.workbench-module-grid .card__title { color: var(--color-ink); }
.workbench-preview__status { margin: var(--s-6) 0 0; padding: var(--s-4) var(--s-6); border-left: 3px solid var(--color-accent); background: rgba(255,255,255,.08); color: #d9e6ef; }
@media (max-width: 767px) { .workbench-preview__story { padding: var(--s-6); } }

.stat-bar { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-6); margin: 0; padding: var(--s-8) 0; border-block: 1px solid var(--color-divider); }
@media (min-width: 768px) { .stat-bar { grid-template-columns: repeat(4, 1fr); } }
.stat-bar__value { font-size: var(--fs-36); font-weight: var(--fw-bold); color: var(--color-primary); font-variant-numeric: tabular-nums; line-height: 1.1; }
.stat-bar__value em { font-style: normal; color: var(--color-accent); }
.stat-bar__label { font-size: var(--fs-14); color: var(--color-muted); }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, 0.96); border-bottom: 1px solid var(--color-divider); backdrop-filter: blur(6px); transition: box-shadow var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out); }
.site-header--scrolled { background: rgba(255, 255, 255, 0.9); box-shadow: var(--shadow-sm); }
.site-header__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s-4); min-height: 68px; }
.site-header__brand { display: flex; align-items: center; gap: var(--s-3); color: var(--color-ink); font-weight: var(--fw-bold); }
.site-header__brand:hover { text-decoration: none; }
.site-header__logo { width: 160px; height: auto; object-fit: contain; }
.site-nav { display: none; }
@media (min-width: 1024px) { .site-nav { display: flex; align-items: center; gap: var(--s-4); } }
.site-nav a { color: var(--color-body); font-size: var(--fs-14); font-weight: var(--fw-medium); padding-block: var(--s-2); border-bottom: 2px solid transparent; }
.site-nav a:hover { color: var(--color-primary); text-decoration: none; }
.site-nav a.router-link-active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.site-nav a.btn--primary { color: #fff; padding-inline: var(--s-4); border-bottom-color: transparent; }
.site-nav a.btn--primary:hover { color: #fff; }
.site-header__toggle { display: none; align-items: center; justify-content: center; min-width: 44px; height: 44px; padding-inline: var(--s-3); white-space: nowrap; background: none; border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer; font: inherit; }
html.has-js .site-header__toggle { display: inline-flex; }
@media (min-width: 1024px) { html.has-js .site-header__toggle { display: none; } }
.site-nav--open { display: flex; flex-direction: column; align-items: flex-start; gap: var(--s-2); padding-bottom: var(--s-3); max-height: calc(100vh - 68px); overflow-y: auto; }
html.has-js .nojs-nav { display: none; }
@media (max-width: 1023px) { .site-header__inner { padding-block: var(--s-2); } .site-nav { width: 100%; order: 3; } .site-nav--open a { display: inline-flex; align-items: center; min-height: 40px; } }
.site-header__menu-icon { display: grid; gap: 4px; width: 20px; }
.site-header__menu-icon i { display: block; width: 20px; height: 2px; border-radius: 999px; background: var(--color-ink); transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast) var(--ease-out); }
.site-header__menu-icon.is-open i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header__menu-icon.is-open i:nth-child(2) { opacity: 0; }
.site-header__menu-icon.is-open i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
@media (min-width: 1024px) { .site-header__logo { width: 180px; } }

.site-footer { background: var(--color-primary-dark); color: #fff; padding-block: var(--s-16) var(--s-8); font-size: var(--fs-14); }
.site-footer a { color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.site-footer__grid { display: grid; gap: var(--s-8); margin-bottom: var(--s-12); }
@media (min-width: 768px) { .site-footer__grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.site-footer h4 { color: #fff; font-size: var(--fs-16); margin-bottom: var(--s-3); }
.site-footer__meta { border-top: 1px solid rgba(255, 255, 255, 0.2); padding-top: var(--s-6); color: var(--color-primary-tint); display: flex; flex-wrap: wrap; gap: var(--s-4); justify-content: space-between; }
.site-footer__filings { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-4); margin-top: var(--s-4); text-align: center; }
.site-footer h2 { color: #fff; font-size: var(--fs-16); margin-bottom: var(--s-3); }

.page-head { background: var(--color-primary-tint); padding-block: var(--s-12); }
.page-head__title { font-size: var(--fs-30); margin-bottom: var(--s-3); }
.page-head__lead { color: var(--color-body); max-width: 68ch; margin: 0; }
@media (min-width: 768px) { .page-head__title { font-size: var(--fs-36); } }

.breadcrumb { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--s-2); margin: 0 0 var(--s-6); padding: 0; font-size: var(--fs-16); color: var(--color-muted); overflow-wrap: anywhere; }
.breadcrumb a { color: var(--color-muted); text-decoration: underline; text-underline-offset: 3px; }
.breadcrumb [aria-current="page"] { min-width: 0; }

.prose { max-width: 76ch; min-width: 0; }
.container.prose { max-width: var(--container); }
.prose > h2:first-child, .prose > h3:first-child { margin-top: 0; }
.prose h2, .prose h3 { scroll-margin-top: 88px; }
.prose h2 { margin-top: var(--s-12); font-size: var(--fs-24); }
.prose h3 { margin-top: var(--s-8); }
.prose p, .prose li { font-size: var(--fs-16); }
.prose img { border-radius: var(--radius-md); margin-block: var(--s-6); }
.prose blockquote { margin: var(--s-6) 0; padding: var(--s-4) var(--s-6); border-left: 3px solid var(--color-primary); background: var(--color-bg-alt); color: var(--color-body); }
.prose code { font-family: var(--font-mono); font-size: 0.9em; background: var(--color-primary-tint); padding: 2px 6px; border-radius: var(--radius-sm); }
.prose table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; margin-block: var(--s-6); font-size: var(--fs-14); }
.prose th, .prose td { border: 1px solid var(--color-divider); padding: var(--s-3) var(--s-4); text-align: left; }
.prose th { background: var(--color-bg-alt); color: var(--color-ink); }

.form { display: grid; gap: var(--s-4); max-width: 560px; }
.field { display: grid; gap: var(--s-2); }
.field__label { font-size: var(--fs-14); font-weight: var(--fw-medium); color: var(--color-ink); }
.field__hint { font-size: var(--fs-12); color: var(--color-muted); }
.field__error { font-size: var(--fs-14); color: var(--color-danger); }
.field input, .field textarea, .field select {
  width: 100%; padding: 0 var(--s-4); min-height: 44px;
  font: inherit; font-size: var(--fs-16); color: var(--color-body); background: #fff;
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
}
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"], .field select[aria-invalid="true"] { border-color: var(--color-danger); }
.field textarea { min-height: 120px; padding-block: var(--s-3); resize: vertical; }
.consent { display: flex; align-items: flex-start; gap: var(--s-2); font-size: var(--fs-14); color: var(--color-body); }
.consent input { width: 20px; min-height: 20px; height: 20px; padding: 0; margin-top: 2px; flex: 0 0 auto; }
.honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.field input:focus, .field textarea:focus { border-color: var(--color-primary); outline: 2px solid var(--color-primary); outline-offset: 1px; }

.notice { padding: var(--s-4) var(--s-6); border-radius: var(--radius-md); font-size: var(--fs-14); border: 1px solid var(--color-border); background: var(--color-bg-alt); }
.notice--ok { border-color: var(--color-success); background: #ECFDF3; color: var(--color-success); }
.notice--err { border-color: var(--color-danger); background: #FEF2F2; color: var(--color-danger); }
.lead-success { max-width: 560px; scroll-margin-top: 88px; }
.lead-success h2 { font-size: var(--fs-24); }
.lead-summary { display: grid; gap: var(--s-2); margin: var(--s-6) 0; }
.lead-summary div { display: grid; grid-template-columns: minmax(84px, 0.32fr) 1fr; gap: var(--s-3); padding-block: var(--s-2); border-bottom: 1px solid color-mix(in srgb, var(--color-success) 20%, white); }
.lead-summary dt { color: var(--color-muted); }
.lead-summary dd { margin: 0; overflow-wrap: anywhere; }
.concept-disclosure { max-width: 76ch; margin: var(--s-6) 0; padding: var(--s-4); border-left: 3px solid var(--color-accent); background: #fffbeb; color: #713f12; font-size: var(--fs-14); }
.image-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); margin: var(--s-6) 0; }
.image-grid figure { margin: 0; border: 1px solid var(--color-divider); border-radius: var(--radius-md); overflow: hidden; background: #fff; }
.image-grid img { width: 100%; height: auto; object-fit: contain; background: var(--color-bg-alt); }
.image-grid figcaption { padding: var(--s-3); color: var(--color-muted); font-size: var(--fs-12); }
@media (max-width: 600px) { .image-grid { grid-template-columns: 1fr; } }
@media (min-width: 1024px) { .detail-layout { grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr); align-items: start; } }
.contact-layout { display: grid; gap: var(--s-8); }
@media (min-width: 768px) { .contact-layout { grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr); gap: var(--s-6); align-items: start; } .contact-layout > aside { grid-column: 2; grid-row: 1; } .contact-layout > div { grid-column: 1; grid-row: 1; } }
@media (min-width: 1024px) { .contact-layout > aside { position: sticky; top: 88px; } }

.list-plain { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--s-3); }
.list-plain li { margin: 0; padding-left: var(--s-6); position: relative; }
.list-plain li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 8px; height: 8px; border-radius: 2px; background: var(--color-accent); }

.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-6); counter-reset: step; }
.timeline li { position: relative; padding-left: var(--s-12); margin: 0; }
.timeline li::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: 0;
  font-family: var(--font-mono); font-size: var(--fs-14); color: var(--color-primary);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: 2px 6px;
}
.timeline li::after { content: ""; position: absolute; left: 15px; top: 32px; bottom: calc(var(--s-6) * -1); width: 1px; background: var(--color-divider); }
.timeline li:last-child::after { display: none; }

.ai-feature .section__head { max-width: 800px; }
.ai-scenario-grid .card, .ai-faq-grid .card { height: 100%; }
#ai-scenarios, #ai-start, #ai-value, #ai-faq, #fde-definition, #fde-scenarios, #fde-measure, #fde-start { scroll-margin-top: 88px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--color-primary); color: #fff; padding: var(--s-2) var(--s-4); z-index: 100; }
.skip-link:focus { left: var(--s-2); top: var(--s-2); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }