:root {
  --color-primary: #0B3D2E;
  --color-primary-dark: #08251D;
  --color-accent: #C9A227;
  --color-accent-light: #D9AD2B;
  --color-paper: #F7F3EC;
  --color-white: #FFFFFF;
  --color-text: #0B3D2E;
  --color-text-secondary: #5A6B62;
  --color-border: #D8CFC0;
  --color-success: #2E7D32;
  --color-warning: #E6A800;
  --font-sans: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
  --container: 1200px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 2rem;
  --space-4: 4rem;
  --space-5: 6rem;
  --header-height: 84px;
  --radius: 2px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.container {
  width: min(var(--container), 92%);
  margin-inline: auto;
}

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

.section--tight {
  padding-block: var(--space-3);
}

.section-title {
  font-size: clamp(1.875rem, 3vw, 2.5rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.section-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.page-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.page-intro {
  max-width: 65ch;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.section-head {
  margin-bottom: var(--space-3);
}

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

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

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 1200;
  transform: translateY(-220%);
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  transition: transform 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1100;
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 2px 20px rgba(8, 37, 29, 0.18);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  min-height: var(--header-height);
  margin-inline: auto;
  padding-inline: 5vw;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-white);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8125rem;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.1;
}

.brand__name {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  position: relative;
  display: block;
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.82);
  transition: color 0.2s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.25s ease;
}

.site-nav a:hover {
  color: var(--color-white);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

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

.site-nav__cta {
  margin-left: 0.5rem;
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  z-index: 1200;
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(201, 162, 39, 0.18);
}

.scroll-progress__bar {
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.btn--accent:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(8, 37, 29, 0.22);
}

.btn--outline {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  background: rgba(201, 162, 39, 0.12);
  border: 1px solid rgba(201, 162, 39, 0.35);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
}

.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  padding: var(--space-3);
  border-radius: var(--radius);
}

.card--dark {
  background: var(--color-primary-dark);
  border-color: transparent;
  color: rgba(247, 243, 236, 0.85);
}

.card--dark .stat {
  color: var(--color-white);
}

.card--dark .stat::after {
  color: var(--color-accent);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block: 1rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.media-frame[data-placeholder]::before {
  content: "IMAGE / RESPONSIVE FRAME";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: rgba(11, 61, 46, 0.5);
}

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

.stat {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.stat::after {
  content: attr(data-suffix);
  color: var(--color-accent);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.site-footer {
  background: var(--color-primary-dark);
  color: rgba(247, 243, 236, 0.72);
  font-size: 0.9375rem;
  border-top: 2px solid var(--color-accent);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-3);
  padding-block: var(--space-4);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.site-footer__tagline {
  font-size: 0.9375rem;
  color: rgba(247, 243, 236, 0.82);
}

.site-footer__note {
  font-size: 0.8125rem;
  color: rgba(247, 243, 236, 0.58);
  max-width: 34ch;
}

.site-footer__heading {
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.site-footer__links a {
  display: inline-block;
  color: rgba(247, 243, 236, 0.72);
  transition: color 0.2s ease;
}

.site-footer__links a:hover {
  color: var(--color-accent);
}

.site-footer__contact p {
  margin-bottom: 0.45rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(247, 243, 236, 0.14);
  padding-block: 1.25rem;
  font-size: 0.8125rem;
  color: rgba(247, 243, 236, 0.5);
}

.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 1024px) {
  :root {
    --header-height: 72px;
  }

  .brand__tag {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-primary-dark);
    padding: 1rem 5vw 1.75rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 18px 30px rgba(8, 37, 29, 0.28);
    transition: transform 0.25s ease, opacity 0.2s ease, visibility 0.2s ease;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(247, 243, 236, 0.12);
    font-size: 1.0625rem;
  }

  .site-nav__cta {
    margin-left: 0;
    margin-top: 1.25rem;
    text-align: center;
  }

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

@media (max-width: 768px) {
  .section {
    padding-block: var(--space-3);
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding-block: var(--space-3);
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    gap: 0.25rem;
  }
}

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

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

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

  .btn--accent:hover {
    transform: none;
  }
}