*, *::before, *::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 800;
  line-height: 1.2;
}
p {
  margin: 0 0 1rem;
}
ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
a {
  color: var(--color-sky);
  text-decoration-color: rgba(74, 144, 217, 0.4);
  text-underline-offset: 3px;
}
a:hover {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}
img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}
button, input, select, textarea {
  font: inherit;
}
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 6px;
}
::selection {
  background: rgba(201, 162, 39, 0.3);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

:root {
  --color-primary: #0A1A3E;
  --color-accent: #C9A227;
  --color-accent-soft: #E4C357;
  --color-green: #3E8E7E;
  --color-sky: #4A90D9;
  --color-canvas: #F5F7FA;
  --color-white: #FFFFFF;
  --color-ink: #1A1A1A;
  --color-gray: #333333;
  --color-line: rgba(10, 26, 62, 0.14);
  --gradient-sky: linear-gradient(135deg, #0A1A3E, #4A90D9);
  --gradient-steppe: linear-gradient(120deg, #3E8E7E, #4A90D9);
  --font-title: "PingFang SC Heavy", "Microsoft YaHei Heavy", "Heiti SC", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --content-max: 1180px;
  --header-height: 7.5rem;
  --radius: 18px;
  --radius-soft: 26px;
  --shadow: 0 18px 40px rgba(10, 26, 62, 0.12);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 20%, rgba(74, 144, 217, 0.35) 0 1.25rem, transparent 9rem),
    radial-gradient(circle at 88% 0%, rgba(62, 142, 126, 0.25) 0 1.25rem, transparent 11rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0) 35%);
  pointer-events: none;
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-sky) 45%, var(--color-green) 100%);
  pointer-events: none;
}
.site-header__inner {
  position: relative;
  z-index: 1;
}

.site-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.12);
  z-index: 2;
  pointer-events: none;
}
.site-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-sky), var(--color-green));
  transition: width 0.1s ease-out;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  display: inline-block;
  padding: 0.6rem 1rem;
  background: var(--color-accent);
  color: var(--color-primary);
  font-family: var(--font-title);
  border-radius: 0 0 12px 0;
  text-decoration: none;
}
.skip-link:focus-visible {
  left: 0;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  column-gap: 2rem;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 1rem 1.25rem 0.35rem;
}
.masthead__eyebrow,
.masthead__contact {
  justify-self: start;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.7);
}
.masthead__contact {
  justify-self: end;
}
.site-brand {
  grid-column: 2;
  justify-self: center;
  font-family: var(--font-title);
  font-size: clamp(1.65rem, 4vw, 2.7rem);
  line-height: 1;
  letter-spacing: 0.05em;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
}
.site-brand__accent {
  color: var(--color-accent);
}
.site-brand:hover {
  color: #fff;
}
.site-brand:hover .site-brand__accent {
  color: var(--color-accent-soft);
}

.nav {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 0 1.25rem 0.5rem;
}
.nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
}
.nav__link {
  display: block;
  padding: 0.4rem 0.9rem;
  font-family: var(--font-title);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav__link:hover,
.nav__link:focus-visible,
.nav__link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(201, 162, 39, 0.14);
  border-color: rgba(201, 162, 39, 0.4);
}

.nav-toggle {
  display: none;
  position: absolute;
  top: 1rem;
  right: 1rem;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: #fff;
  cursor: pointer;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.18);
}
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.nav-toggle__bar + .nav-toggle__bar {
  margin-top: 4px;
}
.nav-toggle__text {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

@media (max-width: 767px) {
  :root {
    --header-height: 4.75rem;
  }
  .site-header__inner {
    position: relative;
  }
  .masthead {
    grid-template-columns: 1fr;
    padding: 1.25rem 3.25rem 0.4rem;
  }
  .masthead__eyebrow,
  .masthead__contact {
    display: none;
  }
  .site-brand {
    grid-column: auto;
    font-size: 1.5rem;
    white-space: nowrap;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .nav {
    display: none;
    padding: 0.25rem 1rem 1rem;
  }
  .nav[data-open="false"] {
    display: none;
  }
  .nav[data-open="true"] {
    display: block;
  }
  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
  }
  .nav__link {
    width: 100%;
    padding: 0.65rem 1rem;
    border-radius: 0.65rem;
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.15);
  }
  .nav__link[aria-current="page"] {
    border-color: rgba(201, 162, 39, 0.5);
  }
}

.site-footer {
  position: relative;
  background: linear-gradient(180deg, #0A1A3E 0%, #071128 100%);
  color: #D7E1EF;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(74, 144, 217, 0.28), transparent 70%);
  pointer-events: none;
}
.site-footer::after {
  content: "";
  position: absolute;
  left: -120px;
  bottom: -100px;
  width: 400px;
  height: 200px;
  background: radial-gradient(circle at 20% 0%, rgba(62, 142, 126, 0.22), transparent 60%);
  transform: rotate(-8deg);
  pointer-events: none;
}
.site-footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 2.1fr 1fr 1fr 1.5fr;
  gap: 2rem;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) 1.25rem 2rem;
}
.site-footer__brand-panel,
.site-footer__nav-panel,
.site-footer__contact-panel {
  min-width: 0;
}
.site-footer__brand {
  font-family: var(--font-title);
  font-size: 2rem;
  line-height: 1.2;
  color: #fff;
  letter-spacing: 0.04em;
}
.site-footer__brand span {
  color: var(--color-accent);
}
.site-footer__tagline {
  margin: 0.4rem 0 0.75rem;
  font-family: var(--font-title);
  color: var(--color-accent-soft);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
}
.site-footer__desc {
  color: #B9C8DC;
  max-width: 34rem;
  font-size: 0.95rem;
}
.site-footer__heading {
  font-family: var(--font-title);
  font-size: 1rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.8rem;
  color: #fff;
  text-transform: uppercase;
}
.site-footer__list a {
  display: inline-block;
  padding: 0.15rem 0;
  font-size: 0.92rem;
  color: #C7D4E6;
  text-decoration: none;
}
.site-footer__list a:hover {
  color: var(--color-accent);
}
.site-footer__contact-panel p {
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: #C7D4E6;
}
.site-footer__nav-panel--compact {
  padding-right: 0.5rem;
}
.site-footer__bar {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 1.1rem 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #A9BBCC;
}
.site-footer__bar p {
  margin: 0;
}

@media (max-width: 979px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem 1.5rem;
  }
}
@media (max-width: 600px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }
  .site-footer__bar {
    justify-content: center;
    text-align: center;
  }
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.section {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  position: relative;
}
.section--tint {
  background: var(--color-canvas);
}
.section--deep {
  background: var(--gradient-sky);
  color: #fff;
}
.section--deep .section-title {
  color: #fff;
}
.section-head {
  max-width: 760px;
  margin-bottom: 2rem;
}
.eyebrow {
  display: block;
  font-family: var(--font-title);
  font-size: 0.8rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.4rem;
}
.display-title {
  font-family: var(--font-title);
  font-size: clamp(2.6rem, 8vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.section-title {
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.1;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
.section-title--on-dark {
  color: #fff;
}
.lead {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-gray);
}
.lead--on-dark {
  color: #D7E1EF;
}
.prose {
  max-width: 72ch;
}
.prose p {
  margin-bottom: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-title);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: #fff;
  background: var(--color-accent);
  border: 2px solid var(--color-accent);
  border-radius: 999px;
  padding: 0.7rem 1.5rem;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 20px rgba(201, 162, 39, 0.25);
  cursor: pointer;
}
.btn:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent-soft);
  color: #fff;
  transform: translateY(-2px);
}
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: none;
}
.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn--on-dark {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn--on-dark:hover {
  background: var(--color-accent-soft);
  color: var(--color-primary);
}
.btn--on-dark.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: none;
}
.btn--on-dark.btn--outline:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}

.split-screen {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: clamp(1.5rem, 4vw, 4.5rem);
  align-items: start;
}
.split-screen__story {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}
.split-screen__indices {
  min-width: 0;
  display: grid;
  gap: 1.25rem;
}
@media (max-width: 900px) {
  .split-screen {
    grid-template-columns: 1fr;
  }
  .split-screen__story {
    position: static;
  }
}

.grid {
  display: grid;
  gap: 1.5rem;
}
.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
@media (max-width: 979px) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 620px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(10, 26, 62, 0.08);
}
.card--glass {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: 0 16px 40px rgba(10, 26, 62, 0.12);
  border-radius: 26px 12px 26px 12px;
}
.card--deep {
  background: var(--color-primary);
  color: #fff;
  border-radius: 26px;
  box-shadow: var(--shadow);
}
.glass-panel {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  border-radius: 26px 12px 26px 12px;
  padding: clamp(1.2rem, 3vw, 2.4rem);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #DCE7F5, #B9CDE8);
  border-radius: 20px 8px 20px 8px;
  min-height: 220px;
}
.media-frame--yurt {
  border-radius: 50% 50% 16px 16px / 90% 90% 16px 16px;
}
.media-frame--wind {
  border-radius: 10px 70px 10px 70px;
}
.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  padding: 1rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.status-strip__label {
  font-family: var(--font-title);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--color-sky);
  margin-right: 0.3rem;
}
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-family: var(--font-title);
  font-size: 0.78rem;
  color: #fff;
}
.status-chip--on {
  background: var(--color-green);
  border-color: var(--color-green);
}
.status-chip--gold {
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}
.status-chip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}
.filter-btn {
  appearance: none;
  background: transparent;
  border: 1px solid rgba(10, 26, 62, 0.3);
  color: var(--color-primary);
  border-radius: 999px;
  padding: 0.5rem 1.15rem;
  font-family: var(--font-title);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.filter-btn[aria-pressed="true"],
.filter-btn.is-active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--color-gray);
  margin-bottom: 1rem;
}
.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}
.breadcrumb__sep::before {
  content: "/";
  color: var(--color-accent);
  margin-inline: 0.2rem;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(10, 26, 62, 0.06);
}
.spec-table th,
.spec-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(10, 26, 62, 0.08);
}
.spec-table th {
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 700;
}
.spec-table tr:last-child td {
  border-bottom: 0;
}
.spec-table tr:hover td {
  background: rgba(201, 162, 39, 0.06);
}

.deco-curve {
  position: absolute;
  width: 120%;
  height: 180px;
  background: var(--gradient-sky);
  opacity: 0.12;
  border-radius: 50% 50% 0 0 / 90% 90% 0 0;
  transform: rotate(-3deg);
  pointer-events: none;
}
.deco-yurt {
  position: absolute;
  width: 180px;
  height: 90px;
  border-radius: 180px 180px 0 0;
  background: var(--color-accent);
  opacity: 0.28;
  pointer-events: none;
}
.deco-yurt::after {
  content: "";
  position: absolute;
  inset: 24px 34px auto;
  height: 3px;
  background: var(--color-sky);
  opacity: 0.8;
}