:root {
  --paper: #f3efe4;
  --paper-deep: #e7dfd0;
  --paper-light: #fffdf7;
  --ink: #161a18;
  --muted: #535a55;
  --line: #c8bfae;
  --forest: #173f33;
  --forest-deep: #0d2921;
  --amber: #dc9b3d;
  --amber-deep: #8d4d0d;
  --white: #fffdf8;
  --success: #296747;
  --shadow: 0 1.5rem 4rem rgba(25, 31, 27, 0.12);
  --radius-sm: 0.55rem;
  --radius-lg: 1.55rem;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 5rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 20rem;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 63, 51, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 63, 51, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 4rem 4rem;
  font-family: "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 0.2rem solid var(--amber); outline-offset: 0.25rem; }
.shell { width: min(78rem, calc(100% - 2rem)); margin: 0 auto; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: 0.7rem 1rem; color: var(--white); background: var(--forest); }
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--line), transparent 22%);
  background: color-mix(in srgb, var(--paper), transparent 5%);
  backdrop-filter: blur(1rem);
}
.nav { min-height: 4.8rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.75rem; text-decoration: none; white-space: nowrap; }
.brand img { width: 2.5rem; height: 2.5rem; border-radius: 0.65rem; box-shadow: 0 0.45rem 1.2rem rgba(23, 63, 51, 0.18); }
.brand strong { font-family: "STKaiti", "KaiTi", serif; font-size: 1.4rem; letter-spacing: 0.08em; }
.nav-links { display: flex; align-items: center; gap: 1.35rem; }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 700; text-decoration: none; }
.nav-links a:hover { color: var(--forest); }
.login-link, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, color 160ms ease, background 160ms ease;
}
.login-link:hover, .button:hover { color: var(--white); background: var(--ink); transform: translateY(-2px); }
.button.primary { min-height: 3.5rem; padding-inline: 1.6rem; border-color: var(--forest); border-radius: var(--radius-sm); color: var(--white); background: var(--forest); box-shadow: var(--shadow); }
.button.primary:hover { background: var(--forest-deep); }

.hero { position: relative; display: grid; grid-template-columns: 1.12fr 0.88fr; gap: var(--space-5); align-items: center; min-height: 44rem; padding: var(--space-6) 0; overflow: hidden; }
.hero::after { content: "PM"; position: absolute; right: -2rem; bottom: -8rem; z-index: -1; color: rgba(23, 63, 51, 0.06); font: 800 28rem/1 Georgia, serif; letter-spacing: -0.14em; }
.eyebrow { display: flex; align-items: center; gap: 0.75rem; color: var(--amber-deep); font-size: 0.78rem; font-weight: 900; letter-spacing: 0.17em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 2.5rem; border-top: 2px solid var(--amber); }
h1, h2, h3 { font-family: "STKaiti", "KaiTi", "Noto Serif SC", serif; }
h1 { max-width: 13ch; margin: 1.2rem 0 1.5rem; font-size: clamp(3.3rem, 7.8vw, 7.2rem); line-height: 0.98; letter-spacing: -0.05em; }
.hero-copy { max-width: 42rem; color: var(--muted); font-size: 1.1rem; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem; margin-top: var(--space-4); }
.text-link { color: var(--forest); font-weight: 800; text-underline-offset: 0.35rem; }

.identity-card { position: relative; padding: var(--space-4); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--paper-light); box-shadow: var(--shadow); }
.identity-card::before { content: ""; position: absolute; inset: 0.75rem; pointer-events: none; border: 1px solid var(--paper-deep); border-radius: 1rem; }
.card-kicker { position: relative; display: flex; justify-content: space-between; gap: 1rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.verified { display: inline-flex; align-items: center; gap: 0.45rem; color: var(--success); }
.verified::before { content: ""; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: #3e9a68; box-shadow: 0 0 0 0.3rem rgba(62, 154, 104, 0.13); }
.identity-list { position: relative; margin: 1rem 0 0; }
.identity-row { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: 0.85rem 0; border-bottom: 1px solid var(--paper-deep); }
.identity-row:last-child { border-bottom: 0; }
.identity-row dt { color: var(--muted); }
.identity-row dd { margin: 0; font-weight: 800; }

.section { padding: var(--space-6) 0; border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: var(--space-5); align-items: end; margin-bottom: var(--space-5); }
.section-heading h2 { margin: 0; font-size: clamp(2.25rem, 5vw, 4.6rem); line-height: 1.04; }
.section-heading p { max-width: 45rem; margin: 0; color: var(--muted); }
.capability-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; }
.capability { grid-column: span 4; min-height: 18rem; padding: 2rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: rgba(255, 253, 247, 0.74); }
.capability.wide { grid-column: span 8; }
.capability.dark { color: var(--white); border-color: var(--forest); background: var(--forest); }
.capability.amber { border-color: var(--amber); background: var(--amber); }
.capability-no { display: block; margin-bottom: 3.5rem; font: 800 0.76rem/1 Georgia, serif; letter-spacing: 0.14em; }
.capability h3 { margin: 0 0 0.75rem; font-size: 1.65rem; line-height: 1.2; }
.capability p { margin: 0; opacity: 0.84; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.55rem; margin: 1.1rem 0 0; padding: 0; list-style: none; }
.tag-list li { padding: 0.35rem 0.65rem; border: 1px solid currentColor; border-radius: 999px; font-size: 0.78rem; font-weight: 800; opacity: 0.82; }

.api-section { color: var(--white); background: var(--ink); }
.api-section .section-heading p { color: #ccd0cc; }
.api-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.api-card { padding: 2rem; border: 1px solid #3b443f; border-radius: var(--radius-lg); background: #1d221f; }
.api-card .api-type { color: #f1b65e; font-size: 0.78rem; font-weight: 900; letter-spacing: 0.13em; text-transform: uppercase; }
.api-card h3 { margin: 1rem 0 0.75rem; font-size: 2rem; }
.api-card p, .api-card li { color: #ccd0cc; }
.api-card ul { padding-left: 1.2rem; }
.boundary { margin-top: 1rem; padding: 1rem 1.1rem; border-left: 3px solid var(--amber); color: #f4d29d; background: #272e2a; }

.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); background: var(--line); gap: 1px; }
.trust-item { min-height: 11rem; padding: 1.5rem; background: var(--paper); }
.trust-item strong { display: block; margin-bottom: 0.5rem; color: var(--forest); }
.trust-item p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.contact-band { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 2rem; align-items: center; padding: 3rem; border-radius: var(--radius-lg); color: var(--white); background: var(--forest); box-shadow: var(--shadow); }
.contact-band h2 { margin: 0; font-size: clamp(2.3rem, 5vw, 4rem); line-height: 1.06; }
.contact-band p { color: #dce6e1; }
.contact-links { display: grid; gap: 0.75rem; }
.contact-links a { padding: 0.85rem 1rem; border: 1px solid rgba(255,255,255,0.35); border-radius: var(--radius-sm); font-weight: 800; text-decoration: none; overflow-wrap: anywhere; }
.contact-links a:hover { background: rgba(255,255,255,0.1); }

.legal-hero { padding: 6rem 0 3rem; }
.legal-hero h1 { max-width: 16ch; font-size: clamp(3rem, 7vw, 6.2rem); }
.legal-lead { max-width: 50rem; color: var(--muted); font-size: 1.1rem; }
.legal-layout { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 4rem; padding: 2rem 0 6rem; }
.legal-aside { align-self: start; position: sticky; top: 6rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-sm); background: rgba(255,253,247,0.72); }
.legal-aside strong { display: block; margin-bottom: 0.5rem; }
.legal-aside p { margin: 0; color: var(--muted); font-size: 0.86rem; }
.legal-content { max-width: 52rem; }
.legal-content section { padding: 0 0 2.5rem; border-bottom: 1px solid var(--line); }
.legal-content section + section { padding-top: 2.5rem; }
.legal-content h2 { margin: 0 0 1rem; font-size: 2rem; }
.legal-content h3 { margin: 1.6rem 0 0.6rem; font-size: 1.25rem; }
.legal-content p, .legal-content li { color: var(--muted); }
.legal-content li + li { margin-top: 0.45rem; }
.note { padding: 1rem 1.2rem; border-left: 3px solid var(--amber); background: var(--paper-deep); }
.details-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.detail-card { padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper-light); }
.detail-card strong { display: block; margin-bottom: 0.4rem; }
.detail-card p { margin: 0; }

footer { padding: 2rem 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.84rem; }
.footer-row { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: start; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.6rem 1rem; }
.footer-links a { text-underline-offset: 0.25rem; }
.disclaimer { max-width: 48rem; margin-top: 0.75rem; font-size: 0.78rem; }

@media (max-width: 64rem) {
  .nav-links a:not(.login-link) { display: none; }
  .capability { grid-column: span 6; }
  .capability.wide { grid-column: span 6; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 50rem) {
  .hero, .section-heading, .api-grid, .contact-band, .legal-layout { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-block: 4rem; }
  .identity-card { max-width: 40rem; }
  .legal-aside { position: static; }
  .footer-row { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}
@media (max-width: 36rem) {
  :root { --space-6: 3.5rem; }
  .shell { width: min(100% - 1.25rem, 78rem); }
  .brand strong { font-size: 1.12rem; }
  .login-link { padding-inline: 0.85rem; }
  h1 { font-size: clamp(3rem, 18vw, 4.6rem); }
  .capability, .capability.wide { grid-column: 1 / -1; min-height: auto; }
  .capability-no { margin-bottom: 2.5rem; }
  .trust-grid, .details-grid { grid-template-columns: 1fr; }
  .contact-band { padding: 2rem 1.25rem; }
  .identity-row { grid-template-columns: 1fr; gap: 0.15rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}