:root {
  --color-bg: #F5F0E6;
  --color-primary: #1B2A4A;
  --color-secondary: #3A507E;
  --color-accent: #E23B2E;
  --color-gold: #D9A441;
  --color-text: #2A2320;
  --color-white: #FFFFFF;
  --color-state: #F06A4F;
  --color-border: #C9BFAF;
  --color-on-dark: #E8E4D8;
  --font-heading: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-index: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --container-width: 1160px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
  width: 100%;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 28px;
    padding-right: 28px;
  }
}

.skip-link {
  position: fixed;
  top: 0;
  left: -9999px;
  z-index: 2000;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 0 0 6px 6px;
}

.skip-link:focus {
  left: 0;
}

.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  z-index: 1500;
  pointer-events: none;
}

[hidden] {
  display: none !important;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li::after {
  content: '/';
  margin: 0 8px;
  color: var(--color-border);
}

.breadcrumb li:last-child::after {
  content: '';
  margin: 0;
}

.breadcrumb li[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
}

.breadcrumb a:hover {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-gold);
}

.content-main {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(0, 4fr);
  gap: 32px;
  padding: 24px 0 64px;
}

@media (max-width: 767px) {
  .content-main {
    display: block;
    padding: 16px 0 40px;
  }
}

.aside-index {
  font-family: var(--font-index);
  font-size: 12px;
  line-height: 1.8;
  color: var(--color-secondary);
  padding-left: 16px;
  border-left: 3px solid var(--color-accent);
}

@media (max-width: 767px) {
  .aside-index {
    margin-bottom: 24px;
  }
}

.section-index {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  color: var(--color-text);
  line-height: 1.2;
  margin: 8px 0 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid transparent;
  border-radius: 6px;
  padding: 22px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-left-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.card-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
}

.tag--gold {
  background: var(--color-gold);
  color: var(--color-text);
  border-color: var(--color-gold);
}

.tag--red {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.hero-banner {
  position: relative;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 8px;
  padding: 48px 48px 40px;
  margin-bottom: 32px;
  overflow: hidden;
}

.hero-banner::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  border-style: solid;
  border-width: 0 48px 48px 0;
  border-color: transparent var(--color-accent) transparent transparent;
}

.text-note {
  font-size: 14px;
  color: var(--color-secondary);
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
  line-height: 1.7;
}

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 6px;
  background-color: var(--color-border);
}

.image-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-fill {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-header {
  position: relative;
  z-index: 100;
}

.header-top {
  background: var(--color-accent);
  color: var(--color-white);
}

.header-top-text {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  padding: 8px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-top-text::before {
  content: '▸ ';
  color: var(--color-gold);
}

.header-main {
  position: relative;
  background-color: var(--color-primary);
  background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 22px 22px;
  padding: 28px 0 24px;
  border-bottom: 4px solid var(--color-gold);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 28px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  padding: 4px 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 20px;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
}

.brand-caption {
  display: block;
  line-height: 1.25;
}

.brand-caption-name {
  display: block;
  font-size: 25px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.06em;
}

.brand-caption-sub {
  display: block;
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-on-dark);
}

.header-meta {
  margin-left: auto;
  max-width: 430px;
}

.header-statement {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-on-dark);
  padding-left: 16px;
  border-left: 3px solid var(--color-gold);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  color: var(--color-white);
  font-family: var(--font-index);
  font-size: 13px;
  line-height: 1;
  background: rgba(255, 255, 255, 0.05);
  transition: background 0.2s, border-color 0.2s;
}

.nav-toggle:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.nav-toggle-icon {
  display: block;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.site-nav {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 2px 0 var(--color-gold);
  position: relative;
  z-index: 90;
}

.nav-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
}

.nav-link {
  position: relative;
  display: block;
  text-align: center;
  padding: 14px 8px 16px;
  font-family: var(--font-heading);
  color: var(--color-text);
  transition: color 0.2s, background-color 0.2s;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--color-accent);
  transition: width 0.2s ease;
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after {
  width: 78%;
}

.nav-link:hover .nav-index {
  color: var(--color-state);
  transform: translateY(-2px);
}

.nav-index {
  display: block;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 2px;
  transition: color 0.2s, transform 0.2s;
}

.nav-label {
  display: block;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-white);
}

.nav-link[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-accent);
}

.nav-link[aria-current="page"]::after {
  width: 78%;
  background: var(--color-gold);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--color-gold);
}

@media (min-width: 768px) and (max-width: 1023px) {
  .nav-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .nav-link {
    padding: 14px 8px;
  }
}

@media (max-width: 767px) {
  .header-main {
    padding: 16px 0;
  }

  .header-meta {
    display: none;
  }

  .nav-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
    box-shadow: none;
    border-top: none;
  }

  .site-nav[data-open] {
    max-height: 460px;
    border-top: 1px solid var(--color-border);
  }

  .nav-list {
    grid-template-columns: 1fr;
  }

  .nav-link {
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    gap: 12px;
    text-align: left;
    padding: 13px 20px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-index {
    flex-shrink: 0;
    min-width: 24px;
  }

  .nav-label {
    font-size: 15px;
  }

  .nav-link[aria-current="page"]::before {
    width: 6px;
  }
}

.app-footer {
  background-color: var(--color-primary);
  color: var(--color-on-dark);
  position: relative;
  margin-top: auto;
}

.app-footer::before {
  content: '';
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-gold) 50%, var(--color-primary) 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
  padding: 56px 0 48px;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.05em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.footer-brand span {
  color: var(--color-accent);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-on-dark);
  max-width: 34em;
}

.footer-meta {
  margin-top: 16px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
  border-top: 1px dashed rgba(255, 255, 255, 0.2);
  padding-top: 12px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.04em;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid rgba(217, 164, 65, 0.5);
}

.footer-heading-index {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 11px;
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 3px;
  margin-right: 8px;
  vertical-align: 1px;
}

.footer-link-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 12px;
}

.footer-link-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  color: var(--color-on-dark);
  font-size: 14px;
  padding: 2px 0;
  transition: color 0.2s;
}

.footer-link-list a::before {
  content: '▪';
  font-size: 10px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.footer-link-list a:hover {
  color: var(--color-gold);
}

.contact-list {
  display: grid;
  gap: 4px;
}

.contact-list li {
  position: relative;
  padding: 7px 0 7px 22px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-size: 14px;
  color: var(--color-on-dark);
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list li::before {
  content: '›';
  position: absolute;
  left: 6px;
  color: var(--color-gold);
  font-family: var(--font-index);
  font-weight: 700;
}

.footer-bottom {
  background: rgba(0, 0, 0, 0.18);
  padding: 18px 0 20px;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 32px;
}

.footer-copy,
.footer-icp {
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--color-on-dark);
}

.footer-copy {
  color: var(--color-gold);
}

.footer-trust {
  margin-top: 18px;
  max-width: 820px;
  font-size: 12px;
  line-height: 1.8;
  color: rgba(217, 164, 65, 0.7);
  border-left: 3px solid var(--color-accent);
  background: rgba(255, 255, 255, 0.05);
  padding: 12px 16px;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 36px 0 32px;
  }
}

.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 800;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 10px 16px;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s, background-color 0.2s;
}

.back-to-top:hover {
  background: var(--color-gold);
  color: var(--color-text);
  transform: translateY(-3px);
}

.back-to-top[hidden] {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}