:root {
  color-scheme: light;
  --color-page: #eef3f5;
  --color-surface: #ffffff;
  --color-surface-soft: #f6f9fa;
  --color-ink: #172b36;
  --color-ink-soft: #4f6570;
  --color-line: #cbd8dd;
  --color-line-strong: #9eb3bc;
  --color-primary: #174d5d;
  --color-primary-dark: #123b49;
  --color-primary-soft: #e1eef1;
  --color-accent: #b9533c;
  --color-accent-soft: #fff1ec;
  --color-success: #2f6a49;
  --color-success-soft: #e6f3ea;
  --color-warning: #835b20;
  --color-warning-soft: #fff5dd;
  --color-focus: #096f8c;
  --shadow-soft: 0 9px 28px rgba(27, 61, 73, 0.08);
  /* Compatibility aliases used by the earlier organ modules. */
  --color-accent-strong: var(--color-accent);
  --color-border: var(--color-line);
  --color-heading: var(--color-ink);
  --color-muted: var(--color-ink-soft);
  --color-surface-subtle: var(--color-surface-soft);
  --color-text: var(--color-ink);
  --color-text-muted: var(--color-ink-soft);
  --radius-pill: 999px;
  --shadow-sm: var(--shadow-soft);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --space-1: 0.35rem;
  --space-2: 0.65rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --content-width: 1180px;
  --reading-width: 780px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 280px;
  background: var(--color-page);
  color: var(--color-ink);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-primary-dark);
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-focus) 72%, transparent);
  outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-ink);
  font-weight: 760;
  line-height: 1.28;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.55rem, 2.4vw, 2.15rem);
  letter-spacing: -0.018em;
}

h3 {
  font-size: clamp(1.08rem, 1.6vw, 1.28rem);
}

p,
ul,
ol {
  margin-top: 0;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 0.4rem;
}

code {
  padding: 0.08rem 0.32rem;
  border: 1px solid var(--color-line);
  border-radius: 4px;
  background: var(--color-surface-soft);
  font-size: 0.92em;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--color-primary-dark);
  color: #fff;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  width: min(calc(100% - 2rem), var(--content-width));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.97);
}

.site-header__inner {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--color-ink);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  color: var(--color-primary);
  font-size: 0.77rem;
  font-weight: 820;
  letter-spacing: 0.06em;
}

.brand__title {
  display: block;
  font-size: 1rem;
  font-weight: 780;
  line-height: 1.25;
}

.brand__subtitle {
  display: block;
  margin-top: 0.12rem;
  color: var(--color-ink-soft);
  font-size: 0.72rem;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.18rem;
  flex-wrap: nowrap;
}

.site-nav a {
  padding: 0.55rem 0.72rem;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 0.91rem;
  font-weight: 680;
  text-decoration: none;
}

.site-nav a:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.site-nav a[aria-current="page"] {
  background: var(--color-primary);
  color: #fff;
}

.site-nav__button {
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: 0.86rem;
  font-weight: 700;
}

.site-nav__button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.site-account-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.site-account-actions a {
  color: var(--color-ink-soft);
  font-size: 0.8rem;
  text-decoration: none;
}

.site-nav-menu {
  position: relative;
}

.site-nav-menu > summary {
  display: grid;
  gap: 0.05rem;
  min-width: 92px;
  padding: 0.48rem 0.58rem;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 0.91rem;
  font-weight: 680;
  list-style: none;
  cursor: pointer;
  line-height: 1.12;
  text-align: center;
}

.site-nav-menu > summary span,
.site-nav-menu > summary small { display: block; }

.site-nav-menu > summary small {
  color: inherit;
  font-size: 0.63rem;
  font-weight: 620;
  letter-spacing: 0.03em;
  opacity: 0.75;
}

.site-nav-menu > summary::-webkit-details-marker { display: none; }
.site-nav-menu > summary::after { position: absolute; right: 0.22rem; top: 50%; margin-left: 0.2rem; content: "⌄"; transform: translateY(-50%); }
.site-nav-menu[open] > summary::after { content: "⌃"; }

.site-nav-menu > summary:hover,
.site-nav-menu > summary:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.site-nav-menu > summary.is-active {
  background: var(--color-primary);
  color: #fff;
}

.site-nav-menu__panel {
  position: absolute;
  z-index: 100;
  top: calc(100% + 0.45rem);
  left: 0;
  display: grid;
  width: min(320px, calc(100vw - 2rem));
  padding: 0.65rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: 0 18px 50px rgba(23, 53, 62, 0.2);
}

.site-nav-menu__panel--right {
  right: 0;
  left: auto;
}

.site-nav-menu__panel--wide {
  left: 50%;
  grid-template-columns: repeat(4, minmax(180px, 1fr));
  width: min(920px, calc(100vw - 2rem));
  transform: translateX(-50%);
}

.site-nav-menu__panel h2 {
  margin: 0 0 0.35rem;
  padding: 0.4rem 0.7rem;
  color: var(--color-primary-dark);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.site-nav-menu__panel a {
  display: block;
  width: 100%;
}

.boundary-strip {
  border-bottom: 1px solid #e6c4ba;
  background: var(--color-accent-soft);
  color: #733725;
}

.boundary-strip .site-shell {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding-block: 0.7rem;
  font-size: 0.88rem;
  line-height: 1.48;
}

.boundary-strip strong {
  flex: 0 0 auto;
}

main {
  min-height: calc(100vh - 270px);
}

.page-section {
  padding-block: var(--space-6);
}

.page-section--compact {
  padding-block: var(--space-5);
}

.section-heading {
  display: grid;
  max-width: var(--reading-width);
  gap: 0.3rem;
  margin-bottom: var(--space-4);
}

.section-heading p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
}

.eyebrow {
  margin-bottom: 0.5rem;
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 820;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.lead {
  color: var(--color-ink-soft);
  font-size: clamp(1.06rem, 1.8vw, 1.24rem);
  line-height: 1.72;
}

.muted {
  color: var(--color-ink-soft);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.loading-state,
.error-state,
.empty-state {
  padding: var(--space-4);
  border: 1px dashed var(--color-line-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink-soft);
}

.error-state {
  border-color: #d49a88;
  background: var(--color-accent-soft);
  color: #733725;
}

.site-footer {
  margin-top: var(--space-6);
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-5);
  padding-block: var(--space-5);
}

.site-footer h2 {
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

.site-footer p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: 0.88rem;
}

.site-footer__links {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.site-footer__links a {
  font-size: 0.88rem;
  font-weight: 680;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.68rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-weight: 740;
  line-height: 1.2;
  text-decoration: none;
}

.button:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

.button--secondary {
  border-color: var(--color-line-strong);
  background: var(--color-surface);
  color: var(--color-primary);
}

.button--secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.button--quiet {
  border-color: transparent;
  background: transparent;
  color: var(--color-primary);
}

.button--quiet:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.button--danger {
  border-color: #d7aa9d;
  background: #fff;
  color: #8a3f2b;
}

.button--danger:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: #733725;
}

.button:disabled,
.button[aria-disabled="true"] {
  cursor: not-allowed;
  border-color: var(--color-line);
  background: #dfe7e9;
  color: #6e7e84;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
    padding-block: 1rem;
  }

  .site-nav {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .site-account-actions { align-self: flex-end; }

  .site-nav-menu__panel--wide {
    left: 0;
    grid-template-columns: repeat(2, minmax(190px, 1fr));
    width: min(720px, calc(100vw - 2rem));
    transform: none;
  }
}

@media (max-width: 720px) {
  :root {
    --space-6: 2.25rem;
  }

  .site-shell {
    width: min(calc(100% - 1.25rem), var(--content-width));
  }

  .site-nav {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-account-actions { align-self: stretch; justify-content: flex-end; }

  .site-nav a {
    border: 1px solid var(--color-line);
    text-align: center;
  }

  .site-nav-menu {
    width: 100%;
  }

  .site-nav-menu > summary {
    border: 1px solid var(--color-line);
    text-align: center;
  }

  .site-nav-menu__panel,
  .site-nav-menu__panel--right,
  .site-nav-menu__panel--wide {
    position: static;
    grid-template-columns: 1fr;
    width: 100%;
    margin-top: 0.35rem;
    transform: none;
    box-shadow: none;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__links {
    justify-content: flex-start;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15.5px;
  }

  .brand__subtitle {
    display: none;
  }

  .site-nav {
    grid-template-columns: 1fr;
  }

  .boundary-strip .site-shell {
    display: block;
  }

  .button-row,
  .button-row .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* Batch A: professional information architecture shell */
.site-header__inner--v2 {
  display: grid;
  grid-template-columns: minmax(215px, 0.72fr) minmax(580px, 2fr) minmax(150px, 0.55fr);
  gap: 1rem;
  padding-block: 0.65rem;
}

.site-nav--primary {
  display: grid;
  grid-template-columns: repeat(6, minmax(82px, 1fr));
  gap: 0.2rem;
}

.site-menu-toggle {
  display: none;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-ink);
  padding: 0.65rem 0.8rem;
  font: inherit;
  font-weight: 750;
}

.site-nav--primary .site-nav__link {
  display: grid;
  min-height: 48px;
  place-content: center;
  gap: 0.12rem;
  padding: 0.45rem 0.38rem;
  text-align: center;
}

.site-nav__link span,
.site-nav__link small {
  display: block;
}

.site-nav__link small {
  font-size: 0.62rem;
  font-weight: 620;
  letter-spacing: 0.025em;
  opacity: 0.76;
}

.site-header__tools {
  display: grid;
  align-content: center;
  gap: 0.4rem;
}

.site-utility-nav {
  display: flex;
  justify-content: flex-end;
  gap: 0.15rem 0.5rem;
  flex-wrap: wrap;
}

.site-utility-nav a {
  color: var(--color-ink-soft);
  font-size: 0.74rem;
  font-weight: 680;
  text-decoration: none;
}

.site-utility-nav a:hover,
.site-utility-nav a[aria-current="page"] {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.18rem;
}

.site-header__tools .site-account-actions {
  justify-content: flex-end;
}

.breadcrumb-bar {
  border-bottom: 1px solid var(--color-line);
  background: #f8fbfb;
}

.breadcrumb-bar__inner {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 0.45rem;
}

.breadcrumbs {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.45rem;
  color: var(--color-ink-soft);
  font-size: 0.82rem;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--color-primary);
  font-weight: 680;
  text-decoration: none;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 720;
}

@media (max-width: 1080px) {
  .site-header__inner--v2 {
    grid-template-columns: minmax(210px, 0.65fr) minmax(560px, 2fr);
  }

  .site-header__tools {
    grid-column: 1 / -1;
    grid-template-columns: 1fr auto;
  }

  .site-utility-nav {
    justify-content: flex-start;
  }
}

@media (max-width: 820px) {
  .site-header__inner--v2 {
    display: grid;
    grid-template-columns: 1fr;
  }

  .site-menu-toggle {
    display: flex;
  }

  .site-nav--primary {
    display: none;
    width: 100%;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .site-nav--primary.is-open {
    display: grid;
  }

  .site-header__tools {
    grid-column: auto;
  }
}

@media (max-width: 520px) {
  .site-nav--primary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-nav--primary .site-nav__link {
    border: 1px solid var(--color-line);
  }

  .site-header__tools {
    grid-template-columns: 1fr;
  }

  .site-header__tools .site-account-actions {
    justify-content: flex-start;
  }

  .breadcrumb-bar__inner {
    align-items: flex-start;
    flex-direction: column;
  }
}