/* WICHF S1 shared-site prototype. Reuses the H5-approved design tokens. */
:root {
  --wichf-ink: #0b0f0e;
  --wichf-ink-soft: #101714;
  --wichf-forest: #10271f;
  --wichf-forest-2: #17352b;
  --wichf-deep-teal: #0e2523;
  --wichf-ivory: #f3efe7;
  --wichf-paper: #e8e0d2;
  --wichf-stone: #d5cdc0;
  --wichf-gold: #b38a50;
  --wichf-gold-soft: #c9b58f;
  --wichf-copper: #936b42;
  --wichf-text-dark: #1b211e;
  --wichf-text-light: #f5f0e7;
  --wichf-text-muted: #656b66;
  --wichf-line-dark: rgba(245, 240, 231, 0.16);
  --wichf-line-light: rgba(27, 33, 30, 0.14);
  --wichf-shell: 1368px;
  --wichf-editorial: 1120px;
  --wichf-font-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --wichf-font-sans: "Source Sans 3", Inter, "Segoe UI", Helvetica, Arial, sans-serif;
  --wichf-motion-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --wichf-motion-fast: 220ms;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  background: var(--wichf-ivory);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--wichf-text-dark);
  background: var(--wichf-ivory);
  font-family: var(--wichf-font-sans);
  font-size: 1rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

html[lang="zh-CN"] body {
  font-family: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", var(--wichf-font-sans);
  line-height: 1.75;
}

body.mobile-nav-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.22em;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--wichf-gold-soft);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 12px 18px;
  color: var(--wichf-ink);
  background: var(--wichf-ivory);
  border: 2px solid var(--wichf-gold);
  transform: translateY(-160%);
}

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

.wichf-shell {
  width: min(calc(100% - 72px), var(--wichf-shell));
  margin-inline: auto;
}

.prototype-banner {
  position: relative;
  z-index: 60;
  min-height: 34px;
  display: grid;
  place-items: center;
  padding: 6px 24px;
  color: #f8f3ea;
  background: #6a4e30;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-align: center;
  text-transform: uppercase;
}

.site-header {
  position: relative;
  z-index: 50;
  min-height: 84px;
  color: var(--wichf-text-light);
  background: var(--wichf-forest);
  border-bottom: 1px solid var(--wichf-line-dark);
}

.site-header[data-variant="OVERLAY"] {
  position: absolute;
  top: 34px;
  right: 0;
  left: 0;
  background: linear-gradient(180deg, rgba(8, 14, 12, 0.78), rgba(8, 14, 12, 0));
  border-bottom-color: transparent;
}

.site-header[data-scrolled="true"] {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  background: rgba(11, 24, 20, 0.97);
  border-bottom-color: var(--wichf-line-dark);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  min-height: 84px;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto auto;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  width: fit-content;
  text-decoration: none;
}

.brand img {
  width: 180px;
  max-height: 42px;
  object-fit: contain;
  object-position: left center;
  filter: brightness(0) invert(1);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2vw, 34px);
  white-space: nowrap;
}

.primary-nav a,
.header-actions a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.045em;
  text-decoration: none;
}

.primary-nav a[aria-current="page"] {
  color: var(--wichf-gold-soft);
}

.primary-nav a[aria-current="page"]::after {
  content: "";
  align-self: end;
  width: 100%;
  height: 2px;
  margin-left: -100%;
  background: currentColor;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-selector {
  position: relative;
}

.language-selector > summary {
  min-width: 56px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-size: 0.8rem;
  font-weight: 700;
}

.language-selector > summary::-webkit-details-marker {
  display: none;
}

.language-selector > summary::after {
  content: "⌄";
  color: var(--wichf-gold-soft);
}

.language-selector__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 190px;
  padding: 8px;
  color: var(--wichf-text-dark);
  background: var(--wichf-ivory);
  border: 1px solid rgba(27, 33, 30, 0.12);
  box-shadow: 0 18px 44px rgba(3, 10, 7, 0.24);
}

.language-selector__menu a,
.language-selector__menu button {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 12px;
  color: inherit;
  background: transparent;
  border: 0;
  text-decoration: none;
  text-align: left;
}

.language-selector__menu a[aria-current="page"] {
  color: var(--wichf-forest);
  background: var(--wichf-paper);
  font-weight: 700;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
}

.button--gold {
  color: var(--wichf-ink);
  background: var(--wichf-gold-soft);
}

.button--outline {
  color: inherit;
  border-color: currentColor;
  background: transparent;
}

.mobile-menu-toggle,
.mobile-nav-close {
  display: none;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0;
  color: var(--wichf-text-light);
  background: transparent;
  border: 1px solid var(--wichf-line-dark);
  cursor: pointer;
}

.mobile-menu-toggle {
  flex-direction: column;
  gap: 6px;
}

.mobile-menu-toggle span {
  width: 21px;
  height: 1px;
  background: currentColor;
}

.mobile-nav-backdrop {
  position: fixed;
  z-index: 80;
  inset: 0;
  background: rgba(4, 9, 7, 0.66);
}

.mobile-nav-drawer {
  position: fixed;
  z-index: 90;
  inset: 0 0 0 auto;
  width: min(92vw, 430px);
  display: flex;
  flex-direction: column;
  padding: 20px 24px 30px;
  color: var(--wichf-text-light);
  background: var(--wichf-forest);
  box-shadow: -24px 0 70px rgba(0, 0, 0, 0.34);
  transform: translateX(102%);
  visibility: hidden;
  transition:
    transform var(--wichf-motion-fast) var(--wichf-motion-ease-out),
    visibility 0s linear var(--wichf-motion-fast);
}

.mobile-nav-drawer.is-open {
  transform: translateX(0);
  visibility: visible;
  transition-delay: 0s;
}

.mobile-nav-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

.mobile-nav-drawer__brand {
  font-family: var(--wichf-font-serif);
  font-size: 1.25rem;
  text-decoration: none;
}

.mobile-nav-drawer nav {
  display: grid;
  gap: 2px;
}

.mobile-nav-drawer nav a {
  min-height: 52px;
  display: flex;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--wichf-line-dark);
  text-decoration: none;
}

.mobile-nav-drawer nav a[aria-current="page"] {
  color: var(--wichf-gold-soft);
}

.mobile-languages {
  margin-block: 30px 24px;
}

.mobile-languages p {
  margin: 0 0 10px;
  color: var(--wichf-gold-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mobile-languages div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mobile-languages a,
.mobile-languages button {
  min-height: 44px;
  display: flex;
  align-items: center;
  width: 100%;
  padding: 8px;
  color: inherit;
  background: transparent;
  border: 1px solid var(--wichf-line-dark);
  text-decoration: none;
  text-align: left;
}

.mobile-languages a[aria-current="page"] {
  color: var(--wichf-ink);
  background: var(--wichf-gold-soft);
}

.no-js-nav {
  display: none;
}

.breadcrumb-wrap {
  padding-block: 18px;
  background: var(--wichf-paper);
  border-bottom: 1px solid var(--wichf-line-light);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.82rem;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--wichf-text-muted);
}

.breadcrumb [aria-current="page"] {
  color: var(--wichf-text-muted);
}

.inner-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(72px, 9vw, 132px);
  background:
    radial-gradient(circle at 78% 24%, rgba(179, 138, 80, 0.22), transparent 26rem),
    var(--wichf-forest);
  color: var(--wichf-text-light);
}

.inner-hero--light {
  color: var(--wichf-text-dark);
  background:
    radial-gradient(circle at 78% 24%, rgba(179, 138, 80, 0.19), transparent 24rem),
    var(--wichf-paper);
}

.inner-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.5fr);
  gap: clamp(34px, 7vw, 110px);
  align-items: end;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--wichf-gold-soft);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.inner-hero h1 {
  max-width: 880px;
  margin: 0;
  font-family: var(--wichf-font-serif);
  font-size: clamp(2.65rem, 6vw, 5.6rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.98;
  text-wrap: balance;
}

html[lang="zh-CN"] .inner-hero h1 {
  font-family: "Noto Serif CJK SC", "Songti SC", SimSun, var(--wichf-font-serif);
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.inner-hero__summary {
  max-width: 680px;
  margin: 28px 0 0;
  font-size: clamp(1.02rem, 1.5vw, 1.24rem);
  color: color-mix(in srgb, currentColor 78%, transparent);
}

.inner-hero__meta {
  padding: 22px 0 4px 24px;
  border-left: 1px solid var(--wichf-line-dark);
}

.inner-hero--light .inner-hero__meta {
  border-left-color: var(--wichf-line-light);
}

.inner-hero__meta dt {
  color: var(--wichf-gold-soft);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.inner-hero__meta dd {
  margin: 4px 0 18px;
}

.page-main {
  min-height: 42vh;
  padding-block: clamp(64px, 8vw, 110px);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(44px, 8vw, 120px);
}

.content-copy {
  max-width: 760px;
}

.content-copy h2 {
  margin: 0 0 24px;
  font-family: var(--wichf-font-serif);
  font-size: clamp(2rem, 3.4vw, 3.35rem);
  font-weight: 500;
  line-height: 1.08;
  text-wrap: balance;
}

.content-copy p {
  margin: 0 0 22px;
  font-size: 1.06rem;
}

.placeholder-frame {
  min-height: 290px;
  display: grid;
  place-items: center;
  margin-top: 40px;
  padding: 36px;
  color: var(--wichf-text-muted);
  background:
    linear-gradient(135deg, rgba(179, 138, 80, 0.12), transparent 55%),
    var(--wichf-paper);
  border: 1px dashed rgba(27, 33, 30, 0.28);
  text-align: center;
}

.page-aside {
  align-self: start;
  padding: 24px;
  background: rgba(232, 224, 210, 0.66);
  border-top: 3px solid var(--wichf-gold);
}

.page-aside h2 {
  margin: 0 0 12px;
  font-size: 0.78rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.page-aside p {
  margin: 0;
  color: var(--wichf-text-muted);
}

.system-message {
  margin-bottom: 34px;
  padding: 16px 18px;
  color: #4f391f;
  background: #f3e5c9;
  border-left: 4px solid var(--wichf-gold);
}

.language-unavailable {
  opacity: 0.82;
}

button.language-unavailable {
  cursor: pointer;
}

[data-language-block].language-unavailable::after {
  content: "×";
  margin-left: auto;
  color: var(--wichf-gold);
  font-weight: 800;
}

.demo-index-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.demo-index-grid section {
  padding: 28px;
  background: var(--wichf-paper);
  border-top: 3px solid var(--wichf-gold);
}

.demo-index-grid h2 {
  margin-top: 0;
  font-family: var(--wichf-font-serif);
}

.demo-index-grid ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.demo-index-grid .button {
  width: 100%;
  justify-content: flex-start;
  color: var(--wichf-text-dark);
}

.final-cta {
  padding-block: clamp(60px, 7vw, 94px);
  color: var(--wichf-text-light);
  background: var(--wichf-deep-teal);
}

.final-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.final-cta h2 {
  max-width: 760px;
  margin: 0;
  font-family: var(--wichf-font-serif);
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 500;
  line-height: 1.05;
}

.site-footer {
  padding-block: 64px 28px;
  color: var(--wichf-text-light);
  background: var(--wichf-ink);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(120px, 1fr));
  gap: 42px;
}

.site-footer__brand strong {
  display: block;
  max-width: 260px;
  font-family: var(--wichf-font-serif);
  font-size: 1.42rem;
  font-weight: 500;
  line-height: 1.2;
}

.site-footer__brand p {
  max-width: 300px;
  color: rgba(245, 240, 231, 0.66);
}

.footer-group h2 {
  margin: 0 0 14px;
  color: var(--wichf-gold-soft);
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.footer-group a,
.footer-group span {
  min-height: 44px;
  display: flex;
  align-items: center;
  color: rgba(245, 240, 231, 0.82);
  text-decoration: none;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: 48px;
  padding-top: 24px;
  color: rgba(245, 240, 231, 0.54);
  border-top: 1px solid var(--wichf-line-dark);
  font-size: 0.78rem;
}

.site-footer__base nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-footer__base .shared-route-unavailable {
  color: rgba(245, 240, 231, 0.48);
  cursor: default;
}

.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;
}

@media (max-width: 1180px) {
  .site-header__inner {
    grid-template-columns: 190px minmax(0, 1fr) auto;
    gap: 16px;
  }

  .brand img {
    width: 164px;
  }

  .primary-nav {
    gap: 15px;
  }

  .primary-nav a {
    font-size: 0.76rem;
  }

  .header-actions .button {
    display: none;
  }
}

@media (max-width: 1023px) {
  .wichf-shell {
    width: min(calc(100% - 48px), var(--wichf-shell));
  }

  .site-header,
  .site-header__inner {
    min-height: 72px;
  }

  .site-header__inner {
    display: flex;
    justify-content: space-between;
  }

  .primary-nav,
  .header-actions .language-selector {
    display: none;
  }

  .mobile-menu-toggle,
  .mobile-nav-close {
    display: inline-flex;
  }

  .inner-hero__grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .inner-hero__meta {
    max-width: 460px;
  }

  .content-grid {
    gap: 50px;
  }

  .page-aside {
    max-width: 640px;
  }

  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .wichf-shell {
    width: min(calc(100% - 36px), var(--wichf-shell));
  }

  .prototype-banner {
    min-height: 38px;
    padding-inline: 14px;
    font-size: 0.63rem;
  }

  .site-header[data-variant="OVERLAY"] {
    top: 38px;
  }

  .brand img {
    width: 150px;
  }

  .inner-hero {
    padding-block: 64px 72px;
  }

  .inner-hero h1 {
    font-size: clamp(2.45rem, 15vw, 4rem);
  }

  .inner-hero__meta {
    padding-left: 18px;
  }

  .final-cta__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .final-cta .button {
    width: 100%;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__brand {
    padding-bottom: 22px;
    border-bottom: 1px solid var(--wichf-line-dark);
  }

  .site-footer__base {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .button,
  .mobile-menu-toggle,
  .mobile-nav-close {
    border: 1px solid ButtonText;
  }
}

/* No-JS: all essential navigation remains in normal document flow. */
.no-js .mobile-menu-toggle,
.no-js .mobile-nav-drawer,
.no-js .mobile-nav-backdrop {
  display: none !important;
}

.no-js .no-js-nav {
  display: none;
}

@media (max-width: 1023px) {
  .no-js .site-header {
    min-height: auto;
  }

  .no-js .site-header__inner {
    min-height: 72px;
  }

  .no-js .no-js-nav {
    display: block;
    padding: 12px 24px 18px;
    border-top: 1px solid var(--wichf-line-dark);
  }

  .no-js .no-js-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 18px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .no-js .no-js-nav a,
  .no-js .no-js-nav button,
  .no-js .no-js-nav .language-unavailable {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: inherit;
    background: transparent;
    border: 1px solid transparent;
    padding-inline: 2px;
    text-align: left;
  }

  .no-js .no-js-nav .language-unavailable {
    cursor: default;
  }
}

@media (max-width: 720px) {
  .demo-index-grid {
    grid-template-columns: 1fr;
  }
}