:root {
  --c-primary: #6a0dad;
  --c-secondary: #9c27b0;
  --c-gold: #d4af37;
  --c-light-grape: #e1bee7;
  --c-deep-gray: #1e1e1e;
  --c-mid-gray: #3a3a3a;
  --c-off-white: #f5f5f5;
  --c-text: #e0e0e0;
  --g-one: #4a0e4e;
  --g-two: #7b1fa2;
  --font-head: "Playfair Display", "Noto Serif SC", "Songti SC", serif;
  --font-body: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-max: 1280px;
  --ease: 0.22s ease;
  --gold-rule: rgba(212, 175, 55, 0.45);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 176px;
  scrollbar-color: var(--c-mid-gray) var(--c-deep-gray);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-deep-gray);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
  background-size: 36px 36px;
  background-position: center top;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--c-off-white);
}

p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
img { display: block; max-width: 100%; height: auto; }
address { font-style: normal; }

a {
  color: var(--c-gold);
  text-decoration-color: rgba(212, 175, 55, 0.35);
  text-underline-offset: 0.2em;
}

a:hover { text-decoration-color: var(--c-gold); }

input, button {
  font: inherit;
  border-radius: 0;
}

#main-content {
  display: block;
  min-height: 62vh;
  scroll-margin-top: 176px;
}

:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 3px;
}

::selection {
  background: var(--c-primary);
  color: var(--c-off-white);
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 300;
  padding: 0.5rem 1rem;
  background: var(--c-gold);
  color: var(--c-deep-gray);
  font-weight: 600;
  font-size: 0.75rem;
  text-decoration: none;
  border-radius: 0;
  transform: translateY(-220%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--c-deep-gray);
}

.container {
  width: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

/* 共享版式组件 */
.page-head {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 3rem 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.page-head__label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.08;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem 0;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  color: rgba(224, 224, 224, 0.55);
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 0.6rem;
  color: rgba(212, 175, 55, 0.4);
}

.breadcrumb a {
  color: rgba(224, 224, 224, 0.65);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--c-gold); }

.breadcrumb [aria-current="page"] { color: var(--c-gold); }

.grid {
  display: grid;
  gap: 1.25rem;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 0;
  transition: border-color var(--ease), transform var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-gold), var(--c-secondary));
  opacity: 0.5;
  transition: opacity var(--ease), width var(--ease);
}

.card:hover {
  border-color: rgba(212, 175, 55, 0.45);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
  width: 3px;
}

.card__title {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.card__text {
  font-size: 0.85rem;
  color: rgba(224, 224, 224, 0.7);
}

.card__link {
  display: inline-block;
  margin-top: 0.75rem;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
}

.card__link:hover { border-color: var(--c-gold); }

.frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--g-one) 0%, var(--g-two) 100%);
}

.frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 28px 28px;
}

.frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  border: 1px solid rgba(212, 175, 55, 0.35);
  pointer-events: none;
}

.frame--landscape { aspect-ratio: 16 / 9; }
.frame--portrait { aspect-ratio: 3 / 4; }

.frame__fallback {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.65rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 0;
  background: transparent;
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-decoration: none;
  appearance: none;
  -webkit-appearance: none;
  transition: background-color var(--ease), border-color var(--ease), color var(--ease);
}

.btn--gold {
  background: var(--c-gold);
  color: var(--c-deep-gray);
}

.btn--gold:hover {
  background: #e5c658;
  color: var(--c-deep-gray);
}

.btn--ghost {
  color: var(--c-gold);
  border-color: rgba(212, 175, 55, 0.6);
}

.btn--ghost:hover {
  background: rgba(212, 175, 55, 0.08);
  color: var(--c-gold);
}

.tag,
.tag--gold {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-left: 2px solid var(--c-secondary);
  background: rgba(156, 39, 176, 0.12);
  color: var(--c-light-grape);
  font-size: 0.6875rem;
  line-height: 1.6;
}

.tag--gold {
  border-left-color: var(--c-gold);
  background: rgba(212, 175, 55, 0.08);
  color: var(--c-gold);
}

.index-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid rgba(212, 175, 55, 0.5);
  background: rgba(212, 175, 55, 0.06);
  color: var(--c-gold);
  font-weight: 600;
  font-size: 0.625rem;
  letter-spacing: 0.14em;
}

.rule-line {
  height: 1px;
  margin: 2.5rem 0;
  border: 0;
  background: linear-gradient(to right, rgba(212, 175, 55, 0.55), rgba(212, 175, 55, 0.06) 70%, transparent);
}

.coords {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: rgba(224, 224, 224, 0.5);
}

.coords::before {
  content: "";
  width: 44px;
  height: 1px;
  background: var(--c-gold);
  opacity: 0.7;
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(30, 30, 30, 0.88);
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--ease), box-shadow var(--ease);
}

.site-header.is-scrolled {
  background: rgba(30, 30, 30, 0.97);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.top-strip {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0.45rem 1.25rem;
  font-size: 0.5625rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(224, 224, 224, 0.42);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.masthead {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0.9rem 1.25rem;
}

.masthead::before {
  content: "";
  position: absolute;
  left: 8px;
  bottom: 5px;
  width: 6px;
  height: 6px;
  background:
    linear-gradient(to right, var(--c-gold), var(--c-gold)) 0 50% / 100% 1px no-repeat,
    linear-gradient(to bottom, var(--c-gold), var(--c-gold)) 50% 0 / 1px 100% no-repeat;
  opacity: 0.7;
}

.masthead__geo {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 0.625rem;
  border-left: 1px solid rgba(212, 175, 55, 0.35);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(224, 224, 224, 0.55);
}

.geo__coords {
  font-family: var(--font-head);
  font-size: 0.8125rem;
  color: var(--c-gold);
}

.geo__label {
  font-size: 0.625rem;
  color: rgba(224, 224, 224, 0.48);
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
}

.brand__mark {
  position: relative;
  display: inline-block;
  flex: 0 0 26px;
  width: 26px;
  height: 30px;
}

.brand__mark::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 11px;
  margin-left: -1px;
  background: var(--c-gold);
}

.brand__mark::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--c-light-grape), var(--c-secondary));
  box-shadow:
    8px 7px 0 -1px var(--c-secondary),
    -7px 8px 0 -1px var(--g-two),
    5px 15px 0 -1px var(--c-gold),
    -3px 17px 0 -2px var(--c-gold),
    9px 16px 0 -2px var(--c-gold);
}

.brand__link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
}

.brand__name {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.22em;
  color: var(--c-off-white);
}

.brand__tagline {
  margin-top: 0.3rem;
  padding-top: 0.3rem;
  border-top: 1px solid rgba(212, 175, 55, 0.35);
  font-size: 0.625rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.masthead__search-wrap {
  justify-self: end;
}

.masthead__search {
  width: min(240px, 26vw);
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 0;
  color: var(--c-off-white);
  font-size: 0.75rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.masthead__search::placeholder {
  color: rgba(224, 224, 224, 0.4);
}

.masthead__search:focus {
  border-color: var(--c-gold);
  box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.18);
}

.primary-nav {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.primary-nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(212, 175, 55, 0.55), transparent);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0 1.25rem;
  list-style: none;
  counter-reset: navIndex;
}

.nav-item {
  counter-increment: navIndex;
}

.nav-item::before {
  content: "/ " counter(navIndex, decimal-leading-zero);
  font-family: var(--font-body);
  font-size: 0.625rem;
  color: rgba(212, 175, 55, 0.55);
  vertical-align: 0.15em;
  margin-right: 0.375rem;
}

.nav-item.is-filtered {
  display: none;
}

.nav-link {
  display: inline-block;
  padding: 0.85rem 1.1rem 0.8rem;
  font-weight: 500;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-gold);
}

.nav-link[aria-current="page"] {
  color: var(--c-off-white);
  border-bottom-color: var(--c-gold);
}

.nav-toggle {
  display: none;
  width: 100%;
  align-items: center;
  justify-content: flex-start;
  gap: 0.75rem;
  padding: 0.9rem 1.25rem;
  background: transparent;
  border: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  color: var(--c-gold);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  cursor: pointer;
  text-align: left;
}

.nav-toggle__bar {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-gold);
  transition: background 0.25s;
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--c-gold);
  transition: transform 0.25s;
}

.nav-toggle__bar::before { top: -6px; }
.nav-toggle__bar::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* 页脚 */
.site-footer {
  position: relative;
  margin-top: 4rem;
  background:
    radial-gradient(600px 200px at 15% 0%, rgba(106, 13, 173, 0.22), transparent 70%),
    rgba(16, 16, 16, 0.6);
  border-top: 1px solid rgba(212, 175, 55, 0.3);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 120px;
  height: 1px;
  background: var(--c-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 2rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 2.75rem 1.25rem 2rem;
}

.footer-brand__name {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: 1.75rem;
  letter-spacing: 0.18em;
  color: var(--c-off-white);
}

.footer-brand__tag {
  margin-bottom: 1rem;
  color: var(--c-gold);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.footer-brand__desc {
  max-width: 30em;
  font-size: 0.8125rem;
  color: rgba(224, 224, 224, 0.6);
}

.footer-heading {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-head);
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  color: var(--c-off-white);
}

.footer-heading__num {
  font-family: var(--font-body);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.footer-list {
  display: grid;
  gap: 0.55rem;
  list-style: none;
}

.footer-link {
  font-size: 0.8125rem;
  color: rgba(224, 224, 224, 0.75);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.footer-link:hover {
  color: var(--c-gold);
  border-color: rgba(212, 175, 55, 0.4);
}

.footer-contact__line {
  margin: 0;
  font-size: 0.8125rem;
  color: rgba(224, 224, 224, 0.75);
}

.footer-contact__support {
  margin: 0.5rem 0 0;
  font-size: 0.75rem;
  color: var(--c-light-grape);
}

.footer-bottom {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem 1.5rem;
  align-items: center;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 1.1rem 1.25rem 1.4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: rgba(224, 224, 224, 0.5);
}

.footer-bottom p {
  margin: 0;
}

.footer-bottom__trust {
  text-align: center;
}

/* 滚动显现 */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* 响应式收束 */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    row-gap: 2rem;
  }
}

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: 1fr 1fr; }
  .grid--4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .top-strip {
    padding: 0.3rem 1rem;
    justify-content: center;
  }
  .top-strip span:nth-child(2) { display: none; }

  .masthead {
    grid-template-columns: 1fr auto;
    gap: 0.4rem;
    padding: 0.75rem 1rem 0.5rem;
  }

  .masthead__geo { display: none; }

  .brand {
    grid-column: 1 / -1;
  }

  .masthead__search-wrap {
    grid-column: 1 / -1;
    justify-self: stretch;
    padding: 0.25rem 0 0.5rem;
  }

  .masthead__search {
    width: 100%;
  }

  .nav-toggle { display: flex; }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
  }

  [data-nav][data-open="true"] .nav-list {
    display: flex;
  }

  .nav-item::before { display: none; }

  .nav-link {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: rgba(212, 175, 55, 0.4);
  }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 2rem;
  }

  .footer-bottom {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    text-align: center;
  }

  .footer-bottom__trust {
    order: 3;
  }
}

@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;
  }

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