/* ===== Reset & Variables ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-red: #C8102E;
  --c-gold: #D4AF37;
  --c-green: #1E3A3A;
  --c-blue: #0D1B2A;
  --c-cream: #F7F3E8;
  --c-yellow: #F5D76E;
  --c-deepred: #8B1E3F;
  --c-greyblue: #A2B9BC;
  --c-white: #FFFFFF;
  --font-heading: 'Noto Serif SC', 'STSong', serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-accent: 'ZCOOL QingKe HuangYou', 'Impact', sans-serif;
  --radius: 2px;
  --content-width: 1200px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.1);
  --shadow-md: 0 4px 12px rgba(0,0,0,.12);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--c-cream);
  color: #2b2b2b;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--c-deepred);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.25;
  margin-bottom: 0.5em;
}

p { margin-bottom: 0.75rem; }

ul, ol { padding-left: 1.25rem; }

.container { width: min(100% - 2rem, var(--content-width)); margin-inline: auto; }
.section { padding-block: 2.5rem; }
.content-area { padding-block: 2.5rem; }

/* ===== Focus ===== */
:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
}

/* ===== Skip link ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  background: var(--c-red);
  color: var(--c-white);
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  font-weight: 700;
  border-radius: 0 0 4px 0;
}
.skip-link:focus {
  left: 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  background: var(--c-red);
  color: var(--c-white);
  text-decoration: none;
  border: 1px solid var(--c-red);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.btn:hover { background: var(--c-deepred); border-color: var(--c-deepred); color: var(--c-white); }
.btn--ghost { background: transparent; color: var(--c-red); }
.btn--ghost:hover { background: var(--c-red); color: var(--c-white); border-color: var(--c-red); }
.btn--gold { background: var(--c-gold); color: var(--c-blue); border-color: var(--c-gold); }
.btn--gold:hover { background: var(--c-yellow); border-color: var(--c-yellow); }

/* ===== Breadcrumb ===== */
.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  padding: 0;
  margin: 0 0 1.5rem;
  font-size: 0.85rem;
}
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin-right: 0.5rem; color: var(--c-greyblue); }
.breadcrumb a { color: var(--c-deepred); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-red); text-decoration: underline; }
.breadcrumb [aria-current] { color: var(--c-green); font-weight: 600; }

/* ===== Grid ===== */
.grid { display: grid; gap: 1rem; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Card ===== */
.card {
  background: var(--c-white);
  border: 1px solid rgba(212,175,55,0.4);
  border-left: 3px solid var(--c-red);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius);
}
.card:hover {
  border-color: var(--c-gold);
  box-shadow: var(--shadow-md);
}
.card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 0.3rem;
}
.card__meta {
  font-size: 0.8rem;
  color: var(--c-greyblue);
}

/* ===== Media placeholder ===== */
.media-placeholder {
  position: relative;
  display: block;
  background:
    linear-gradient(135deg, rgba(200,16,46,0.05), rgba(212,175,55,0.08)),
    var(--c-cream);
  border: 1px dashed var(--c-gold);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
}
.media-placeholder::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--c-greyblue);
  font-family: var(--font-accent);
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ===== Header ===== */
.site-header {
  position: relative;
  background: var(--c-green);
  color: var(--c-cream);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--c-red) 0 20px, var(--c-gold) 20px 40px, var(--c-green) 40px 60px);
  z-index: 10;
}
.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  background:
    linear-gradient(rgba(212,175,55,0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212,175,55,0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  background-color: var(--c-cream);
  color: var(--c-green);
  border-bottom: 1px solid rgba(200,16,46,0.3);
}
.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.site-brand {
  display: inline-flex;
  align-items: baseline;
  background: var(--c-red);
  color: var(--c-white);
  padding: 0.2rem 0.7rem;
  border-radius: 3px;
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
  transition: background 0.2s, transform 0.2s;
}
.site-brand:hover {
  background: var(--c-deepred);
  transform: translateY(-1px);
}
.site-brand__cn {
  font-family: var(--font-accent);
  color: var(--c-gold);
  font-size: 1rem;
  margin-left: 0.15rem;
  text-transform: uppercase;
}
.site-header__badge {
  display: inline-block;
  padding: 0.15rem 0.65rem;
  border: 1px solid var(--c-gold);
  border-radius: 999px;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-deepred);
  white-space: nowrap;
}
.site-header__index {
  display: block;
  text-align: right;
  font-family: var(--font-accent);
  color: var(--c-greyblue);
  letter-spacing: 0.2em;
  line-height: 1.3;
  text-transform: uppercase;
}
.site-header__index-label {
  display: block;
  font-size: 0.6rem;
  opacity: 0.8;
}
.site-header__index-coords {
  display: block;
  font-size: 0.8rem;
}
.site-header__action {
  display: inline-block;
  background: var(--c-red);
  color: var(--c-white);
  padding: 0.55rem 1.2rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 3px;
  border: 1px solid var(--c-red);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.site-header__action:hover {
  background: transparent;
  color: var(--c-red);
  border-color: var(--c-red);
}

/* ===== Navigation ===== */
.site-nav {
  position: relative;
  background: linear-gradient(90deg, var(--c-green), var(--c-blue));
  border-top: 1px solid rgba(212,175,55,0.4);
}
.site-nav__toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 0.7rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  margin-left: auto;
}
.site-nav__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px auto;
  background: var(--c-cream);
  transition: transform 0.2s, opacity 0.2s;
}
.site-nav__menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.site-nav__link {
  display: block;
  padding: 0.7rem 1rem;
  color: var(--c-cream);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.site-nav__link:hover {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}
.site-nav__link[aria-current="page"] {
  color: var(--c-gold);
  border-bottom-color: var(--c-red);
  background: rgba(212,175,55,0.08);
}

/* ===== Navigation overlay ===== */
.site-nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(13,27,42,0.65);
  z-index: 4000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.site-nav__overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ===== Footer ===== */
.site-footer {
  background-image:
    linear-gradient(rgba(212,175,55,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212,175,55,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  background-color: var(--c-blue);
  color: var(--c-cream);
  font-size: 0.9rem;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 2.5rem 1rem 1.5rem;
}
.site-footer__col {
  min-width: 0;
}
.site-footer__brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-white);
}
.site-footer__brand-cn {
  color: var(--c-gold);
  font-family: var(--font-accent);
  font-size: 1rem;
  margin-left: 0.1rem;
}
.site-footer__tagline {
  margin-top: 0.5rem;
  color: var(--c-greyblue);
  font-size: 0.85rem;
}
.site-footer__trust {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--c-greyblue);
  border-left: 2px solid var(--c-gold);
  padding-left: 0.75rem;
  line-height: 1.6;
}
.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.site-footer__contact-list,
.site-footer__link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer__contact-list li {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-cream);
}
.site-footer__link-list li {
  margin-bottom: 0.25rem;
}
.site-footer__link-list a {
  display: inline-block;
  padding: 0.25rem 0;
  color: var(--c-cream);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.site-footer__link-list a:hover {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}
.site-footer__bottom {
  border-top: 1px solid rgba(212,175,55,0.3);
  padding: 1rem;
  text-align: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--c-greyblue);
}
.site-footer__icp {
  font-family: var(--font-body);
}

/* ===== Scroll progress & back-to-top ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold));
  z-index: 9999;
  pointer-events: none;
  transition: width 0.1s linear;
}
.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--c-gold);
  background: var(--c-blue);
  color: var(--c-gold);
  font-family: var(--font-accent);
  font-size: 0.7rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, background 0.3s, color 0.3s;
  z-index: 1000;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .site-header__top {
    flex-wrap: wrap;
  }
  .site-header__index {
    display: none;
  }
  .site-header__action {
    font-size: 0.7rem;
    padding: 0.45rem 0.9rem;
  }
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
  .site-footer__brand {
    grid-column: 1 / -1;
  }
  .grid-cols-4, .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .site-nav {
    display: flex;
    justify-content: flex-end;
    background: var(--c-green);
  }
  .site-nav__toggle {
    display: block;
    position: relative;
    z-index: 5001;
  }
  .site-nav__menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 320px);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    background: var(--c-blue);
    padding-top: 4rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -2px 0 8px rgba(0,0,0,0.3);
    z-index: 5000;
  }
  .site-nav[data-open] .site-nav__menu {
    transform: translateX(0);
  }
  .site-nav__link {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(212,175,55,0.2);
    font-size: 1rem;
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-line:nth-child(2) {
    opacity: 0;
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

@media (max-width: 600px) {
  .site-header__top {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
  }
  .site-header__brand {
    justify-content: space-between;
  }
  .site-header__action {
    text-align: center;
  }
  .grid, .grid-cols-2, .grid-cols-3, .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .site-footer__brand {
    grid-column: auto;
  }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}