/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #1C1B18;
  background-color: #F5F0E6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, h5, h6 {
  font-family: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", STSong, SimSun, serif;
  margin: 0 0 0.5em;
  line-height: 1.3;
  color: #0A2A5E;
  font-weight: 700;
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: #0A2A5E; text-decoration: none; transition: color 0.25s ease; }
a:hover { color: #C9A227; }
img, video { max-width: 100%; height: auto; display: block; }
small { font-size: 0.875em; }

:focus-visible {
  outline: 3px solid #C9A227;
  outline-offset: 2px;
  border-radius: 2px;
}

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

/* ========== CSS VARIABLES ========== */
:root {
  --color-primary: #0A2A5E;
  --color-primary-deep: #071E44;
  --color-gold: #C9A227;
  --color-gold-light: #E3B83A;
  --color-red: #B3272A;
  --color-red-dark: #8D1F22;
  --color-cream: #F5F0E6;
  --color-slate: #6B7A8F;
  --color-moss: #7A8450;
  --color-terracotta: #B8673B;
  --color-text: #1C1B18;
  --color-white: #FFFFFF;
  --color-off-white: #FAF7F0;
  
  --font-serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", STSong, SimSun, serif;
  --font-sans: "PingFang SC", "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1280px;
  --container-padding: 24px;
  --header-height: 88px;
  --border-width: 1px;
  --border-radius-lg: 20px;
  --border-radius-md: 12px;
  --border-radius-sm: 6px;
  
  --space-unit: 8px;
  --space-sm: calc(var(--space-unit) * 2);   /* 16px */
  --space-md: calc(var(--space-unit) * 4);   /* 32px */
  --space-lg: calc(var(--space-unit) * 8);   /* 64px */
  --space-xl: calc(var(--space-unit) * 12);  /* 96px */
  
  --transition-fast: 0.2s ease;
  --transition-slow: 0.4s ease;
  
  --nav-link-hover-highlight: linear-gradient(135deg, rgba(201,162,39,0.15), rgba(201,162,39,0));
  
  --section-divider-pattern: linear-gradient(90deg, transparent 0%, var(--color-gold) 50%, transparent 100%);
}

/* ========== SITE CONTAINER ========== */
.site-container {
  width: 100%;
  max-width: calc(var(--container-width) + var(--container-padding) * 2);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ========== SKIP LINK ========== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 9999;
  background: var(--color-gold);
  color: var(--color-primary-deep);
  padding: 10px 20px;
  border-radius: 0 0 8px 8px;
  font-weight: 600;
  transition: top 0.3s ease;
}
.skip-link:focus {
  top: 0;
  color: var(--color-primary-deep);
}

/* ========== BUTTONS ========== */
.btn,
button.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  border: none;
  cursor: pointer;
  background-color: var(--color-gold);
  color: var(--color-primary-deep);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.btn:hover {
  background-color: var(--color-gold-light);
  color: var(--color-primary);
  box-shadow: 0 6px 18px rgba(201, 162, 39, 0.25);
}
.btn:active {
  transform: translateY(1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-cream);
  box-shadow: 0 6px 18px rgba(10, 42, 94, 0.2);
}
.btn-outline-light {
  background-color: transparent;
  color: var(--color-cream);
  border: 2px solid var(--color-cream);
}
.btn-outline-light:hover {
  background-color: var(--color-cream);
  color: var(--color-primary);
}
.btn-gold:hover {
  background-color: var(--color-gold);
  color: var(--color-primary-deep);
  box-shadow: 0 6px 18px rgba(10, 42, 94, 0.3);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  padding: 4px 0;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
}
.btn-text:hover {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
}
.link-arrow::after {
  content: "→";
  transition: transform var(--transition-fast);
  display: inline-block;
}
.link-arrow:hover::after {
  transform: translateX(4px);
}

/* ========== HEADER ========== */
.site-header {
  background-color: var(--color-cream);
  border-bottom: 4px solid var(--color-primary);
  position: relative;
  z-index: 100;
  overflow: visible;
}
.site-header::after {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 30%, var(--color-gold) 30%, var(--color-gold) 100%);
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
}
.header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 16px;
  padding-bottom: 0;
  gap: 0;
}

/* 刊头布局 */
.header-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding-bottom: 12px;
}
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.8vw, 2.3rem);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  line-height: 1.2;
}
.brand-name span {
  display: block;
  font-size: 0.6em;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  font-weight: 600;
}

.brand-mark {
  display: inline-block;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary) 50%, var(--color-gold) 50%);
  border-radius: 8px 8px 8px 2px;
  border: 2px solid var(--color-primary);
  position: relative;
  overflow: hidden;
  transform: rotate(-5deg);
  transition: transform var(--transition-slow);
}
.brand-link:hover .brand-mark,
.footer-logo:hover .brand-mark {
  transform: rotate(0deg) scale(1.02);
}
.brand-mark-squares {
  position: absolute;
  inset: 4px;
  background-image:
    linear-gradient(135deg, transparent 0%, transparent 46%, rgba(201,162,39,0.9) 46%, rgba(201,162,39,0.9) 54%, transparent 54%),
    linear-gradient(45deg, transparent 0%, transparent 46%, rgba(245,240,230,0.8) 46%, rgba(245,240,230,0.8) 54%, transparent 54%);
  background-size: 8px 8px;
  mix-blend-mode: screen;
}

/* 导航内布局 */
.nav-menu-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
  flex-wrap: wrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 48px;
  height: 48px;
  padding: 8px;
  background: transparent;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  z-index: 1200;
}
.nav-toggle-line {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}
.nav-toggle:hover {
  background-color: var(--color-primary);
}
.nav-toggle:hover .nav-toggle-line {
  background-color: var(--color-cream);
}

/* --- 桌面导航 --- */
.header-nav {
  width: 100%;
  border-top: 1px solid rgba(10, 42, 94, 0.12);
  border-bottom: 1px solid rgba(10, 42, 94, 0.12);
}
.nav-menu {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
}
.nav-item {
  position: relative;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 16px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  border-bottom: 3px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}
.nav-link:hover {
  background: var(--nav-link-highlight);
  color: var(--color-primary);
}
.nav-link[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-gold);
  font-weight: 700;
}

/* Dropdown 子菜单 */
.has-dropdown { position: relative; }
.dropdown-caret {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform var(--transition-fast);
}
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  padding: 8px 0;
  background: var(--color-primary);
  border-radius: 0 0 8px 8px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  z-index: 1100;
}
.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.has-dropdown:hover .dropdown-caret,
.has-dropdown:focus-within .dropdown-caret {
  transform: rotate(180deg);
}
.dropdown-menu li a {
  display: block;
  padding: 10px 20px;
  color: var(--color-cream);
  font-size: 0.95rem;
  border-left: 3px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.dropdown-menu li a:hover {
  background-color: var(--color-primary-deep);
  border-left-color: var(--color-gold);
  color: var(--color-gold);
}

/* 导航 CTA */
.nav-cta {
  margin-left: 8px;
}

/* --- 移动导航按钮 --- */
@media (max-width: 992px) {
  .site-header {
    border-bottom: 2px solid var(--color-primary);
  }
  .site-header::after { display: none; }
  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding-top: 12px;
    padding-bottom: 12px;
  }
  .header-brand {
    width: auto;
    padding-bottom: 0;
  }
  .nav-toggle { display: flex; }

  .header-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 320px;
    max-width: 90vw;
    background-color: var(--color-primary);
    border-top: none;
    border-bottom: none;
    padding: 72px 20px 24px;
    overflow-y: auto;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0s linear 0.3s;
    z-index: 1100;
    border-radius: 0 0 0 24px;
  }
  .header-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition-delay: 0s;
  }
  .nav-menu-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  .nav-link {
    color: var(--color-cream);
    justify-content: space-between;
    padding: 14px 8px;
    border-bottom: 1px solid rgba(245, 240, 230, 0.15);
  }
  .nav-link:hover {
    background-color: transparent;
    color: var(--color-gold);
  }
  .nav-link[aria-current="page"] {
    color: var(--color-gold);
    border-bottom-color: var(--color-gold);
  }
  .has-dropdown .dropdown-menu {
    position: static;
    box-shadow: none;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
    padding: 4px 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 0;
    max-height: 0;
    overflow: hidden;
    border-left: 2px solid var(--color-gold);
    margin-left: 8px;
    padding-left: 4px;
    transition: max-height 0.3s ease;
  }
  .has-dropdown:hover .dropdown-menu,
  .has-dropdown:focus-within .dropdown-menu {
    max-height: 400px;
  }
  .dropdown-menu li a {
    padding: 10px 12px;
    color: var(--color-cream);
    border-left: none;
  }
  .dropdown-menu li a:hover {
    border-left: none;
    color: var(--color-gold);
  }
  .nav-cta {
    margin: 16px 8px 8px;
    justify-content: center;
    border-color: var(--color-gold);
    color: var(--color-gold);
  }
  .nav-cta:hover {
    background-color: var(--color-gold);
    color: var(--color-primary);
  }
}

/* 移动导航遮罩 */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 30, 68, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1050;
  transition: opacity var(--transition-fast);
}
.nav-backdrop[hidden] {
  display: none;
}

/* ========== FOOTER ========== */
.footer {
  background-color: var(--color-primary-deep);
  color: rgba(245, 240, 230, 0.9);
  padding: var(--space-lg) var(--container-padding) 0;
  border-top: 6px solid var(--color-gold);
  position: relative;
  overflow: hidden;
}
/* 页脚装饰：抽象天山斜线 */
.footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, transparent 40%, rgba(201, 162, 39, 0.08) 50%, transparent 60%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}
.footer .site-container {
  position: relative;
  z-index: 1;
}

.footer a {
  color: rgba(245, 240, 230, 0.85);
  transition: color var(--transition-fast);
}
.footer a:hover {
  color: var(--color-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer-brand-name {
  font-size: 1.4rem;
  color: var(--color-cream);
}
.footer-brand-name span {
  font-size: 0.65em;
  color: var(--color-gold);
}

.footer-about {
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.7);
  max-width: 340px;
}

.footer-trust {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.tag-status {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}
.tag-trust {
  background: var(--color-moss);
  color: var(--color-cream);
}
.tag-archive {
  background: var(--color-red);
  color: var(--color-cream);
}

.footer-heading {
  font-size: 1.1rem;
  font-family: var(--font-serif);
  color: var(--color-gold);
  margin-bottom: 16px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(201, 162, 39, 0.35);
  padding-bottom: 8px;
}
.footer-links-list,
.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links-list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.footer-links-list a::before {
  content: "›";
  color: var(--color-gold);
  font-weight: bold;
  transition: transform var(--transition-fast);
  display: inline-block;
}
.footer-links-list a:hover::before {
  transform: translateX(2px);
}
.footer-contact-list li {
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.8);
}
.footer-contact-list a {
  color: rgba(245, 240, 230, 0.8);
}
.footer-contact-list a:hover {
  color: var(--color-gold);
}
.footer-worktime {
  font-size: 0.85rem;
  color: var(--color-slate);
  padding-left: 16px;
  position: relative;
}
.footer-worktime::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background: var(--color-moss);
  border-radius: 50%;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid rgba(245, 240, 230, 0.12);
  padding: 24px 0 32px;
}
.footer-icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(245, 240, 230, 0.6);
}
.footer-icp a {
  color: rgba(245, 240, 230, 0.6);
}
.footer-icp a:hover {
  color: var(--color-gold);
}
.footer-sep {
  opacity: 0.4;
}
.footer-statement {
  font-size: 0.85rem;
  color: rgba(245, 240, 230, 0.5);
  max-width: 60%;
  text-align: right;
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .footer {
    padding-top: 48px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    justify-content: center;
    align-items: center;
  }
  .footer-statement {
    max-width: 100%;
    text-align: center;
  }
}

/* ========== BREADCRUMB ========== */
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 24px;
}
.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-slate);
}
.breadcrumb-list li::after {
  content: "/";
  color: var(--color-slate);
  opacity: 0.6;
}
.breadcrumb-list li:last-child::after {
  content: none;
}
.breadcrumb-list a {
  color: var(--color-primary);
  font-weight: 500;
}
.breadcrumb-list a:hover {
  color: var(--color-gold);
}
.breadcrumb-list li:last-child {
  color: var(--color-gold);
  font-weight: 600;
}

/* ========== SECTION BLOCK ========== */
.section-block {
  padding: var(--space-lg) 0;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 30px;
  height: 2px;
  background: var(--color-gold);
}

/* ========== GRID PANEL (Bento基础) ========== */
.grid-panel {
  position: relative;
  background-color: var(--color-cream);
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(10, 42, 94, 0.15);
  padding: 24px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform 0.2s ease;
  overflow: hidden;
  grid-area: var(--panel-grid-area);
}
.grid-panel:hover {
  border-color: var(--color-gold);
  box-shadow: 0 8px 24px rgba(10, 42, 94, 0.1);
}
.panel-cut {
  border-radius: var(--border-radius-sm) var(--border-radius-lg) var(--border-radius-sm) var(--border-radius-lg);
}
.grid-panel h2,
.grid-panel h3 {
  margin-top: 8px;
}

/* ========== CONTAINER GRID ========== */
.container-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.container-grid-2col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}
.container-grid-3col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
@media (max-width: 768px) {
  .container-grid-2col {
    grid-template-columns: 1fr;
  }
}

/* ========== DIVIDERS ========== */
.divider-x,
.divider-y {
  border: none;
  margin: 0;
  position: relative;
}
.divider-x {
  height: 1px;
  background: var(--section-divider-pattern);
  opacity: 0.4;
  margin: var(--space-md) 0;
}
.divider-y {
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--color-gold), transparent);
}

/* ========== TEXT ACCENT ========== */
.text-accent {
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-weight: 600;
}

/* ========== SCROLL TOP BUTTON ========== */
.scroll-top-button {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background-color: var(--color-primary);
  color: var(--color-cream);
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast), background-color 0.25s ease;
  z-index: 900;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}
.scroll-top-button.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.scroll-top-button:hover {
  background-color: var(--color-gold);
  color: var(--color-primary);
}
.scroll-top-button::before {
  content: "↑";
  font-weight: bold;
}

/* ========== FAQ / ACCORDION (基础样式) ========== */
.accordion-item {
  border-bottom: 1px solid rgba(10, 42, 94, 0.15);
}
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  gap: 12px;
  transition: color var(--transition-fast);
}
.accordion-trigger:hover {
  color: var(--color-gold);
}
.accordion-trigger[aria-expanded="true"] {
  color: var(--color-gold);
}
.accordion-trigger .chevron {
  display: inline-block;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.accordion-trigger[aria-expanded="true"] .chevron {
  transform: rotate(45deg);
}
.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.accordion-content {
  padding-bottom: 20px;
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========== IMAGE / PLACEHOLDER CONTAINER ========== */
.image-figure {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(10, 42, 94, 0.15);
}
.image-figure .image-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(0deg, rgba(7, 30, 68, 0.8), transparent);
  color: var(--color-cream);
  padding: 24px 16px 12px;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* 棋盘格——动态图案容器 */
.image-figure.pattern-grid {
  background-image:
    linear-gradient(45deg, rgba(201,162,39,0.3) 0%, rgba(201,162,39,0.3) 25%, transparent 25%, transparent 75%, rgba(201,162,39,0.3) 75%),
    linear-gradient(45deg, rgba(10,42,94,0.2) 0%, rgba(10,42,94,0.2) 25%, transparent 25%, transparent 75%, rgba(10,42,94,0.2) 75%);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
  background-color: rgba(10, 42, 94, 0.12);
}

/* ========== STATUS BAR / PROGRESS (可选) ========== */
.progress-track {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-red));
  width: 0%;
  z-index: 1500;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ========== UTILITIES ========== */
.text-muted { color: var(--color-slate); font-size: 0.9rem; }
.bg-primary { background-color: var(--color-primary); color: var(--color-cream); }
.bg-dark    { background-color: var(--color-primary-deep); }
.text-gold    { color: var(--color-gold); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}
.border-left-gold { border-left: 3px solid var(--color-gold); padding-left: 12px; }

/* ========== RESPONSIVE ========== */
@media (max-width: 992px) {
  :root {
    --container-padding: 16px;
  }
  .nav-menu-wrap {
    border-top: none;
  }
  .nav-menu {
    justify-content: center;
  }
}
@media (max-width: 768px) {
  h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
  h2 { font-size: clamp(1.3rem, 3vw, 1.8rem); }
  .container-grid {
    grid-template-columns: 1fr;
  }
  .section-block {
    padding: var(--space-md) 0;
  }
  .scroll-top-button {
    bottom: 16px;
    right: 16px;
  }
}

/* ========== PRINT / REDUCED MOTION EXTRA ========== */
@media print {
  .site-header, .footer, .scroll-top-button, .progress-track { display: none !important; }
  body { background: white; color: black; }
}

/* Corner accents */
.header-corner {
  display: none;
}

/* 全局选中文本颜色 */
::selection {
  background: var(--color-gold);
  color: var(--color-primary-deep);
}

/* 滚动条美化（可选） */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-cream);
}
::-webkit-scrollbar-thumb {
  background: var(--color-slate);
  border-radius: 8px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold);
}

/* ========== JS 协议相关样式 ========== */
[data-reveal-panel] {
  opacity: 1;
  transform: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
[data-reveal-panel][data-hidden] {
  opacity: 0;
  transform: translateY(16px);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal-panel] {
    opacity: 1 !important;
    transform: none !important;
  }
  .accordion-panel {
    max-height: none !important;
  }
}

/* 返回顶部隐藏逻辑 */
@media (max-width: 480px) {
  .scroll-top-button {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* 确保header为当前链接在移动端保持样式 */
@media (max-width: 992px) {
  .nav-link[aria-current="page"] {
    color: var(--color-gold);
    border-bottom: 1px solid var(--color-gold);
    background-color: rgba(201, 162, 39, 0.08);
  }
}

/* subtle pattern for header background resembling atlas silk */
.site-header::before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 8px;
  background: linear-gradient(135deg, rgba(10,42,94,0.15) 25%, transparent 25%, transparent 75%, rgba(10,42,94,0.15) 75%) 0 0 / 12px 12px;
  opacity: 0.4;
  pointer-events: none;
  z-index: 1;
}

/* 面板上的装饰边（用于Bento模块） */
.grid-panel::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, transparent 50%, rgba(10,42,94,0.2) 50%);
  pointer-events: none;
  z-index: 0;
}

/* Footer 中的 Bento 样式 */
.footer-grid .footer-brand-col {
  position: relative;
}

/* 用于页面头部区域的背景图案 */
.hero-pattern-geo {
  background-color: var(--color-cream);
  background-image:
    linear-gradient(135deg, rgba(10, 42, 94, 0.06) 0%, rgba(10, 42, 94, 0.06) 40%, transparent 40.5%),
    linear-gradient(315deg, rgba(201, 162, 39, 0.08) 0%, rgba(201, 162, 39, 0.08) 15%, transparent 15.5%);
  background-size: 120px 120px, 160px 160px;
}

/* ========== SAFE AREA ========== */
.site-header, .footer, .site-container {
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}