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

:root {
  --color-desert-sand: #D4A574;
  --color-gobi-gray: #8C8A86;
  --color-snow-white: #F7F5F0;
  --color-vivid-orange: #FF6B1A;
  --color-sand-light: #E8D5C0;
  --color-slate-dark: #2E2E2E;
  --color-cloud-mist: #FDFDFB;
  --color-sunshine-yellow: #F2C14E;
  --color-ink: #1A1A1A;
  --color-border: rgba(46, 46, 46, 0.14);
  --color-border-light: rgba(247, 245, 240, 0.18);
  --color-link-footer: #F7F5F0;
  --color-link-footer-hover: #F2C14E;

  --font-heading: "Source Han Sans SC", "思源黑体", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-body: "Source Han Sans SC", "思源黑体", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", "DIN Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;

  --header-height: 76px;
  --header-height-compact: 60px;
  --content-max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition-speed: 240ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-card: 0 2px 8px rgba(46, 46, 46, 0.05);
  --shadow-lift: 0 18px 40px -28px rgba(46, 46, 46, 0.35);
  --shadow-nav: 0 24px 32px -24px rgba(46, 46, 46, 0.18);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--color-cloud-mist);
  color: var(--color-ink);
  font-size: 16px;
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--color-ink);
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(34px, 6vw, 64px); }
h2 { font-size: clamp(24px, 3.5vw, 42px); }
h3 { font-size: clamp(18px, 2vw, 24px); }

p {
  margin: 0 0 1.2em;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

ul,
ol {
  padding-left: 1.4em;
}

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

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

button {
  background: none;
  border: none;
  cursor: pointer;
}

.t-num {
  font-family: var(--font-num);
  letter-spacing: 0.03em;
  font-variant-numeric: tabular-nums;
}

:focus-visible {
  outline: 3px solid var(--color-vivid-orange);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--color-sunshine-yellow);
  color: var(--color-slate-dark);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1200;
  padding: 12px 20px;
  background: var(--color-slate-dark);
  color: var(--color-snow-white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transform: translateY(-220%);
  transition: transform 200ms var(--ease-out);
}

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

/* ===== Header ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 110;
  background: rgba(253, 253, 251, 0.85);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 240ms var(--ease-out), background 240ms var(--ease-out);
}

.site-header[data-compact] {
  box-shadow: 0 8px 24px -20px rgba(46, 46, 46, 0.24);
  background: rgba(253, 253, 251, 0.94);
}

.site-header__inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  transition: height 240ms var(--ease-out);
}

.site-header[data-compact] .site-header__inner {
  height: var(--header-height-compact);
}

.scroll-progress {
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-vivid-orange);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 5;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px 10px 10px 2px;
  background: var(--color-vivid-orange);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 23px;
  line-height: 1;
  transform: skewX(-6deg);
  box-shadow: 0 4px 14px -6px rgba(255, 107, 26, 0.55);
  transition: transform 240ms var(--ease-out);
}

.brand:hover .brand__mark {
  transform: skewX(-6deg) translateY(-2px);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__text strong {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

.brand__text small {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-gobi-gray);
  white-space: nowrap;
}

/* ===== Nav toggle ===== */

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-snow-white);
  font-weight: 700;
  font-size: 14px;
  color: var(--color-slate-dark);
  line-height: 1;
  transition: border-color 200ms var(--ease-out), background 200ms var(--ease-out);
}

.nav-toggle:hover {
  border-color: var(--color-vivid-orange);
  background: var(--color-cloud-mist);
}

.nav-toggle__box {
  position: relative;
  width: 20px;
  height: 14px;
  display: block;
}

.nav-toggle__box i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: top 240ms var(--ease-out), transform 240ms var(--ease-out), opacity 240ms var(--ease-out);
}

.nav-toggle__box i:first-child {
  top: 0;
}

.nav-toggle__box i:last-child {
  bottom: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__box i:first-child {
  top: 6px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__box i:last-child {
  bottom: 6px;
  transform: rotate(-45deg);
}

/* ===== Site nav ===== */

.site-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
  color: var(--color-slate-dark);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color 200ms var(--ease-out), background 200ms var(--ease-out);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-vivid-orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease-out);
}

.site-nav__link:hover {
  color: var(--color-ink);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-sand-light);
  color: var(--color-ink);
}

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

/* ===== Footer ===== */

.site-footer {
  position: relative;
  background: var(--color-slate-dark);
  color: var(--color-snow-white);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(38%, 460px);
  height: 4px;
  background: var(--color-vivid-orange);
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -140px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 165, 116, 0.16), transparent 70%);
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

.site-footer__primary {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 5vw, 72px);
  padding: 52px 0 36px;
}

.brand--footer {
  text-decoration: none;
}

.brand--footer .brand__text strong {
  color: var(--color-snow-white);
}

.brand--footer .brand__text small {
  color: var(--color-sand-light);
}

.brand--footer .brand__mark {
  box-shadow: 0 4px 18px -8px rgba(255, 107, 26, 0.4);
}

.site-footer__trust {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.78);
}

.site-footer__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-content: start;
}

.site-footer__heading {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-sand-light);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.site-footer__contact {
  list-style: none;
  display: grid;
  gap: 10px;
}

.site-footer__contact > div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 10px;
  align-items: baseline;
}

.site-footer__contact dt {
  font-size: 13px;
  color: var(--color-sand-light);
}

.site-footer__contact dd {
  margin: 0;
  font-size: 14px;
  color: var(--color-snow-white);
  overflow-wrap: anywhere;
}

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

.site-footer__links {
  list-style: none;
  display: grid;
  gap: 6px;
  padding: 0;
}

.site-footer__links a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--color-link-footer);
  text-decoration: none;
  transition: color 200ms var(--ease-out), transform 200ms var(--ease-out);
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-link-footer-hover);
  transform: translateX(3px);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 22px 0 28px;
  border-top: 1px solid var(--color-border-light);
  font-size: 12px;
  color: rgba(247, 245, 240, 0.62);
}

.site-footer__legal p {
  margin: 0;
}

/* ===== Layout primitives ===== */

.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

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

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

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

.section__head {
  margin-bottom: 28px;
  max-width: 680px;
}

.section__title {
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: "";
  display: inline-block;
  width: 0.42em;
  height: 0.12em;
  margin-left: 0.22em;
  background: var(--color-vivid-orange);
  transform: skewX(-24deg);
}

/* ===== Page hero ===== */

.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 96px) clamp(20px, 4vw, 48px);
  background: var(--color-cloud-mist);
  border-bottom: 1px solid var(--color-border);
}

.page-hero::before {
  content: "";
  position: absolute;
  right: -100px;
  top: -60px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle at 65% 35%, rgba(242, 193, 78, 0.35), transparent 70%);
  pointer-events: none;
}

.page-hero__inner {
  max-width: var(--content-max-width);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.page-hero__title {
  font-weight: 900;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.08;
  margin-bottom: 18px;
  max-width: 16ch;
}

.page-hero__title::after {
  content: "";
  display: inline-block;
  width: 0.36em;
  height: 0.11em;
  margin-left: 0.18em;
  background: var(--color-vivid-orange);
  transform: skewX(-22deg);
  vertical-align: middle;
}

.page-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  max-width: 60ch;
  color: var(--color-slate-dark);
}

/* ===== Breadcrumb ===== */

.breadcrumb {
  margin-top: 24px;
}

.breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 13px;
}

.breadcrumb__list li::before {
  content: "/";
  margin-right: 10px;
  color: var(--color-gobi-gray);
}

.breadcrumb__list li:first-child::before {
  content: none;
}

.breadcrumb__link {
  color: var(--color-gobi-gray);
  text-decoration: none;
  transition: color 200ms var(--ease-out);
}

.breadcrumb__link:hover {
  color: var(--color-vivid-orange);
  text-decoration: underline;
}

.breadcrumb__link[aria-current="page"] {
  color: var(--color-slate-dark);
  font-weight: 700;
  text-decoration: none;
}

/* ===== Buttons ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out), border-color 200ms var(--ease-out), background 200ms var(--ease-out), color 200ms var(--ease-out);
}

.btn--primary {
  background: var(--color-vivid-orange);
  color: var(--color-ink);
  box-shadow: 0 1px 1px rgba(46, 46, 46, 0.08), 0 12px 24px -14px rgba(255, 107, 26, 0.65);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 30px -16px rgba(255, 107, 26, 0.6);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-slate-dark);
  color: var(--color-snow-white);
  transform: translateY(-2px);
}

/* ===== Grid ===== */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

/* ===== Card ===== */

.card {
  background: var(--color-cloud-mist);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: transform 240ms var(--ease-out), box-shadow 240ms var(--ease-out), border-color 240ms var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(212, 165, 116, 0.6);
}

.card--flat {
  background: var(--color-cloud-mist);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.card--flat:hover {
  transform: none;
  box-shadow: none;
  border-color: rgba(212, 165, 116, 0.6);
}

/* ===== Tag ===== */

.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-sand-light);
  color: var(--color-slate-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.6;
}

/* ===== Divider / terrain ===== */

.divider {
  height: 10px;
  background: linear-gradient(95deg, var(--color-sand-light) 0%, transparent 72%);
  border: 0;
}

.terrain-bg {
  background:
    repeating-linear-gradient(115deg, transparent 0 12px, rgba(46, 46, 46, 0.035) 12px 13px),
    var(--color-snow-white);
}

/* ===== Image shell ===== */

.img-shell {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-sand-light);
  aspect-ratio: 4 / 3;
}

.img-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(212, 165, 116, 0.3));
  pointer-events: none;
}

.img-shell > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Responsive ===== */

@media (max-width: 960px) {
  :root {
    --header-height: 68px;
    --header-height-compact: 56px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 100;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: rgba(253, 253, 251, 0.98);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-nav);
    transition: max-height 280ms var(--ease-out), visibility 0s linear 280ms;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    visibility: visible;
    transition: max-height 280ms var(--ease-out);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px clamp(20px, 4vw, 48px) 22px;
  }

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

  .site-nav__item:last-child {
    border-bottom: 0;
  }

  .site-nav__link {
    display: block;
    padding: 15px 8px;
    font-size: 16px;
    border-radius: 0;
  }

  .site-nav__link::after {
    left: 8px;
    right: auto;
    width: 36px;
    bottom: 2px;
  }

  .site-nav__link[aria-current="page"] {
    background: transparent;
    color: var(--color-ink);
  }
}

@media (max-width: 768px) {
  .site-footer__primary {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 44px 0 28px;
  }

  .site-footer__meta {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

@media (min-width: 768px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Reduced motion ===== */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .site-header__inner {
    transition: none;
  }

  .skip-link {
    transition: none;
  }
}