:root {
  --color-snow: #F7F4EF;
  --color-cream: #FDFBF7;
  --color-ink: #1A1817;
  --color-stone: #2E2A28;
  --color-clay: #C8523E;
  --color-lapis: #1F4E79;
  --color-moss: #5A7D5A;
  --color-gold: #D9A441;
  --color-sand: #E8CDC0;
  --color-grass: #8A9A5B;

  --font-base: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'Roboto Mono', 'Consolas', monospace;

  --text-xxl: clamp(2.5rem, 5vw + 0.5rem, 4rem);
  --text-xl: clamp(1.9rem, 3.4vw + 0.5rem, 3rem);
  --text-lg: clamp(1.4rem, 2vw + 0.5rem, 2rem);
  --text-md: 1.2rem;
  --text-body: 1rem;
  --text-sm: 0.875rem;
  --text-xs: 0.75rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 5rem;

  --container-w: 1240px;
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  background: var(--color-snow);
  color: var(--color-stone);
  font-family: var(--font-base);
  font-size: var(--text-body);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--color-ink);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

h1 { font-size: var(--text-xxl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-md); }

p { margin-bottom: 1rem; }

ul, ol {
  list-style: none;
}

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

a:hover {
  color: var(--color-clay);
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

strong { font-weight: 700; }

::selection {
  background: var(--color-gold);
  color: var(--color-ink);
}

:focus-visible {
  outline: 2px solid var(--color-lapis);
  outline-offset: 3px;
  border-radius: 0;
}

.container {
  width: min(100% - clamp(1.25rem, 5vw, 2.5rem), var(--container-w));
  margin-inline: auto;
}

.container--narrow {
  max-width: 820px;
}

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

.section--compact {
  padding-block: var(--space-4);
}

.section--dark {
  background: var(--color-ink);
  color: var(--color-snow);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-snow);
}

.section--tint {
  background: var(--color-sand);
}

.section--grass {
  background: var(--color-grass);
  color: var(--color-ink);
}

.section--grass h2,
.section--grass h3 {
  color: var(--color-ink);
}

.section__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 2px solid var(--color-ink);
  padding-bottom: 0.75rem;
  margin-bottom: var(--space-3);
}

.section--dark .section__header {
  border-bottom-color: rgba(247, 244, 239, 0.3);
}

.section__title {
  margin: 0;
  font-size: var(--text-lg);
}

.section__link {
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-data);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-clay);
  margin-bottom: 0.5rem;
}

.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 999;
  padding: 0.6rem 1.2rem;
  background: var(--color-ink);
  color: var(--color-snow);
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  color: var(--color-snow);
}

.site-header {
  position: relative;
  background: linear-gradient(180deg, var(--color-snow) 0%, var(--color-cream) 100%);
  border-bottom: 2px solid var(--color-ink);
}

.site-header__inner {
  padding-block: var(--space-4) 0;
  position: relative;
}

.site-brand {
  text-align: center;
  padding-bottom: 1.2rem;
}

.site-brand__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem 0.9rem;
  text-decoration: none;
  color: var(--color-ink);
}

.site-brand__name {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1;
  color: inherit;
}

.site-brand__sub {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.4em;
  color: var(--color-clay);
}

.site-header__rule {
  height: 5px;
  background: linear-gradient(90deg, var(--color-clay) 0 40%, var(--color-lapis) 40% 74%, var(--color-gold) 74% 100%);
}

.site-header__nav-wrap {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--color-stone);
}

.site-header__nav-wrap > .site-nav {
  grid-column: 2;
  grid-row: 1;
}

.site-header__nav-wrap > .site-nav__meta {
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-data);
  font-size: var(--text-xs);
  color: var(--color-moss);
  margin: 0;
}

.nav-toggle {
  display: none;
}

.site-nav__list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.site-nav__link {
  display: block;
  padding: 0.85rem 1.25rem;
  color: var(--color-ink);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.05em;
  font-size: var(--text-sm);
}

.site-nav__link:hover {
  color: var(--color-clay);
  background: var(--color-sand);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-clay);
  box-shadow: inset 0 -3px var(--color-clay);
  background: transparent;
}

.site-footer {
  background: var(--color-ink);
  color: var(--color-snow);
  border-top: 5px solid var(--color-clay);
  margin-top: clamp(3rem, 6vw, 5rem);
}

.site-footer a {
  color: var(--color-sand);
  text-decoration-color: rgba(232, 205, 192, 0.5);
}

.site-footer a:hover {
  color: var(--color-gold);
}

.site-footer .site-brand__link {
  color: var(--color-snow);
}

.site-footer .site-brand__name {
  color: var(--color-snow);
}

.site-footer .site-brand__sub {
  color: var(--color-gold);
}

.site-footer__brand .site-brand__link {
  display: flex;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1.4fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding-block: var(--space-6) var(--space-5);
}

.site-footer__col {
  min-width: 0;
}

.site-footer__brand {
  min-width: 0;
}

.site-footer__heading {
  color: var(--color-snow);
  font-size: var(--text-sm);
  letter-spacing: 0.25em;
  border-bottom: 1px solid rgba(247, 244, 239, 0.2);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.site-footer__about {
  color: rgba(247, 244, 239, 0.7);
  font-size: var(--text-sm);
  line-height: 1.8;
  max-width: 46ch;
  margin-top: 0.75rem;
}

.site-footer__links li,
.site-footer__contact li {
  margin-bottom: 0.4rem;
}

.site-footer__links a {
  font-size: var(--text-sm);
  text-decoration: none;
  display: inline-block;
  padding: 0.15rem 0;
}

.site-footer__links a:hover {
  text-decoration: underline;
}

.site-footer__contact {
  font-size: var(--text-sm);
  color: rgba(247, 244, 239, 0.75);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
  justify-content: space-between;
  border-top: 1px solid rgba(247, 244, 239, 0.15);
  padding-block: 1.25rem;
  font-size: var(--text-xs);
  color: rgba(247, 244, 239, 0.6);
}

.site-footer__legal {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.site-footer__legal a {
  text-decoration: none;
}

.site-footer__icp {
  font-family: var(--font-data);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--color-clay);
  color: #fff;
  border: 2px solid var(--color-clay);
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: var(--text-sm);
  text-decoration: none;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-snow);
}

.btn--ghost {
  background: transparent;
  color: var(--color-clay);
  border-color: var(--color-clay);
}

.btn--ghost:hover {
  background: var(--color-clay);
  color: #fff;
}

.btn--dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-snow);
}

.btn--dark:hover {
  background: var(--color-lapis);
  border-color: var(--color-lapis);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn--block {
  width: 100%;
}

.card {
  background: var(--color-cream);
  border: 1px solid var(--color-sand);
  padding: var(--space-3);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.card:hover {
  border-color: var(--color-clay);
}

.card--dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-snow);
}

.card--dark h3,
.card--dark h4 {
  color: var(--color-snow);
}

.card--tint {
  background: var(--color-sand);
}

.card__title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card__meta {
  font-size: var(--text-xs);
  color: var(--color-moss);
  font-family: var(--font-data);
  margin-bottom: 0.5rem;
}

.card__text {
  font-size: var(--text-sm);
  color: var(--color-stone);
}

.card--dark .card__text {
  color: rgba(247, 244, 239, 0.75);
}

.card__link {
  font-weight: 700;
}

.site-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.grid-col-3 { grid-column: span 3; }
.grid-col-4 { grid-column: span 4; }
.grid-col-5 { grid-column: span 5; }
.grid-col-6 { grid-column: span 6; }
.grid-col-8 { grid-column: span 8; }
.grid-col-12 { grid-column: span 12; }

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-3);
}

.bento__item {
  grid-column: span 6;
  background: var(--color-cream);
  border: 1px solid var(--color-stone);
  padding: var(--space-3);
  min-height: 9rem;
}

.bento__item--span-3 { grid-column: span 3; }
.bento__item--span-4 { grid-column: span 4; }
.bento__item--span-6 { grid-column: span 6; }
.bento__item--span-8 { grid-column: span 8; }
.bento__item--span-12 { grid-column: span 12; }

.bento__item--dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
}

.bento__item--dark h2,
.bento__item--dark h3,
.bento__item--dark h4,
.bento__item--dark .stat__value {
  color: var(--color-snow);
}

.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-block: 3px solid var(--color-ink);
  background: var(--color-cream);
}

.hero-split__content {
  padding: clamp(1.5rem, 4vw, 3.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-split__visual {
  position: relative;
  min-height: 320px;
  background: linear-gradient(135deg, var(--color-sand), var(--color-lapis));
  border-left: 1px solid var(--color-stone);
}

.breadcrumbs {
  padding-block: 1.25rem;
  font-size: var(--text-sm);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: var(--color-sand);
}

.breadcrumbs__link {
  text-decoration: none;
  color: var(--color-lapis);
}

.breadcrumbs__current {
  color: var(--color-clay);
  font-weight: 700;
}

.tag {
  display: inline-block;
  background: var(--color-clay);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.08em;
}

.tag--gold {
  background: var(--color-gold);
  color: var(--color-ink);
}

.tag--lapis {
  background: var(--color-lapis);
  color: #fff;
}

.tag--ghost {
  background: transparent;
  border: 1px solid var(--color-stone);
  color: var(--color-stone);
}

.tag--moss {
  background: var(--color-moss);
  color: #fff;
}

.data-label {
  font-family: var(--font-data);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-stone);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.data-label::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: var(--color-clay);
}

.stat {
  border-left: 3px solid var(--color-clay);
  padding-left: 1rem;
}

.stat--lapis {
  border-left-color: var(--color-lapis);
}

.stat--gold {
  border-left-color: var(--color-gold);
}

.stat__value {
  font-family: var(--font-data);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-ink);
}

.stat__value .unit {
  font-size: 0.5em;
  color: var(--color-clay);
}

.stat--dark .stat__value {
  color: var(--color-snow);
}

.stat__label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-stone);
  margin-top: 0.25rem;
}

.media-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 12rem;
  background: linear-gradient(135deg, var(--color-sand), var(--color-cream));
  border: 1px dashed var(--color-stone);
  color: var(--color-stone);
  font-family: var(--font-data);
  font-size: var(--text-xs);
  overflow: hidden;
}

.media-placeholder::after {
  content: attr(data-placeholder-text);
  position: absolute;
  bottom: 0.5rem;
  right: 0.75rem;
  padding: 0.2rem 0.5rem;
  background: rgba(26, 24, 23, 0.75);
  color: var(--color-snow);
  letter-spacing: 0.08em;
}

.media-placeholder:not([data-placeholder-text])::after {
  content: "图像占位";
}

.media-placeholder[data-placeholder-text=""]::after {
  display: none;
}

.media-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-placeholder--ratio-16-9 {
  aspect-ratio: 16 / 9;
}

.media-placeholder--ratio-4-3 {
  aspect-ratio: 4 / 3;
}

.media-placeholder--ratio-9-16 {
  aspect-ratio: 9 / 16;
}

.divider {
  height: 1px;
  border: 0;
  background: var(--color-stone);
  margin-block: var(--space-4);
}

.divider--flag {
  height: 6px;
  margin-block: 0;
  background: linear-gradient(90deg, var(--color-clay) 0 33%, var(--color-lapis) 33% 66%, var(--color-gold) 66% 100%);
}

.theme-strip {
  height: 6px;
  background: linear-gradient(90deg, var(--color-clay) 0 33%, var(--color-lapis) 33% 66%, var(--color-gold) 66% 100%);
}

.js [data-reveal][data-reveal-ready]:not([data-revealed]) {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (min-width: 901px) and (max-width: 1100px) {
  .site-nav__link {
    padding-inline: 0.9rem;
  }

  .site-header__nav-wrap > .site-nav__meta {
    display: none;
  }
}

@media (max-width: 900px) {
  .site-header__inner {
    padding-block: 1rem;
  }

  .site-brand {
    padding-bottom: 0;
  }

  .site-header__nav-wrap {
    display: block;
    border-bottom: 0;
  }

  .site-header__nav-wrap > .site-nav,
  .site-header__nav-wrap > .site-nav__meta {
    grid-column: auto;
    grid-row: auto;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: absolute;
    top: 1rem;
    right: 0;
    z-index: 20;
    background: var(--color-ink);
    color: var(--color-snow);
    border: 1px solid var(--color-ink);
    padding: 0.5rem 1rem;
    font-weight: 700;
    font-size: var(--text-sm);
    cursor: pointer;
  }

  .nav-toggle:hover {
    background: var(--color-clay);
    border-color: var(--color-clay);
  }

  .nav-toggle[aria-expanded="true"] {
    background: var(--color-clay);
    border-color: var(--color-clay);
    color: var(--color-snow);
  }

  .site-nav {
    display: none;
  }

  .site-nav[data-open] {
    display: block;
    border-top: 1px solid var(--color-stone);
    margin-top: 0.75rem;
    background: var(--color-cream);
  }

  .site-nav__list {
    flex-direction: column;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--color-sand);
  }

  .site-nav__link {
    padding: 1rem;
  }

  .site-nav__link[aria-current="page"] {
    box-shadow: inset 4px 0 var(--color-clay);
  }

  .site-header__nav-wrap > .site-nav__meta {
    display: block;
    padding: 0.75rem 1rem;
    font-size: var(--text-xs);
    color: var(--color-moss);
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .site-grid {
    gap: var(--space-3);
  }

  .grid-col-3,
  .grid-col-4,
  .grid-col-5,
  .grid-col-6,
  .grid-col-8 {
    grid-column: span 6;
  }

  .grid-col-12 {
    grid-column: span 12;
  }

  .bento__item--span-3,
  .bento__item--span-4,
  .bento__item--span-6,
  .bento__item--span-8 {
    grid-column: span 6;
  }

  .hero-split {
    grid-template-columns: 1fr;
  }

  .hero-split__visual {
    border-left: 0;
    border-top: 1px solid var(--color-stone);
  }
}

@media (max-width: 600px) {
  .site-grid {
    gap: var(--space-3);
  }

  .grid-col-3,
  .grid-col-4,
  .grid-col-5,
  .grid-col-6,
  .grid-col-8,
  .grid-col-12 {
    grid-column: span 12;
  }

  .bento__item,
  .bento__item--span-3,
  .bento__item--span-4,
  .bento__item--span-6,
  .bento__item--span-8,
  .bento__item--span-12 {
    grid-column: span 12;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__legal {
    gap: 0.75rem 1.25rem;
  }
}

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

  .js [data-reveal][data-reveal-ready]:not([data-revealed]) {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .skip-link {
    transition: none;
  }

  .card,
  .btn,
  .site-nav__link {
    transition: none;
  }
}