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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Noto Sans SC", "Source Han Sans SC", "思源黑体", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  font-weight: 400;
  background: #0a1930;
  color: #f5f0e6;
  min-height: 100vh;
}

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

input, button, select, textarea {
  font: inherit;
  color: inherit;
}

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

ul[class], ol[class] {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: rgba(212,175,55,0.3);
  color: #f5f0e6;
}

:focus-visible {
  outline: 2px solid #d4af37;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== CSS 变量 ===== */
:root {
  --primary-bg: #0a1930;
  --elevated-bg: #14294d;
  --overlay-bg: #1e3a66;
  --gold-accent: #d4af37;
  --text-primary: #f5f0e6;
  --text-secondary: #c9b98a;
  --red-accent: #8b0000;
  --border-color: #3a5680;
  --gold-dim: rgba(212,175,55,0.3);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "思源宋体", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "思源黑体", sans-serif;

  --container-max: 1200px;
  --container-pad: clamp(16px, 4vw, 32px);
  --header-height: 64px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --transition: 0.25s ease;
}

@media (min-width: 768px) {
  :root {
    --header-height: 76px;
  }
}

/* ===== 容器与主内容 ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

#main-content {
  padding-top: var(--header-height);
  min-height: 100vh;
}

/* ===== 跳转链接 ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  background: #d4af37;
  color: #0a1930;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.9rem;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ===== 头部 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 25, 48, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--gold-dim);
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #d4af37 30%, #d4af37 70%, transparent);
  opacity: 0.85;
  z-index: 2;
}

.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--container-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header__inner::before,
.site-header__inner::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  background: #d4af37;
  border-radius: 2px;
  opacity: 0;
  pointer-events: none;
}

@media (min-width: 768px) {
  .site-header__inner::before {
    left: calc(var(--container-pad) - 1px);
    opacity: 0.5;
  }
  .site-header__inner::after {
    right: calc(var(--container-pad) - 1px);
    opacity: 0.5;
  }
}

/* ===== 品牌 ===== */
.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.site-brand__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 2px solid #d4af37;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: #d4af37;
  position: relative;
  background: rgba(212, 175, 55, 0.05);
}

.site-brand__mark::before {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 50%;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.2;
}

.site-brand__name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  letter-spacing: 3px;
  color: var(--text-primary);
  white-space: nowrap;
}

.site-brand__tagline {
  font-size: 0.7rem;
  letter-spacing: 1px;
  color: var(--text-secondary);
  white-space: nowrap;
  display: none;
}

@media (min-width: 480px) {
  .site-brand__tagline {
    display: block;
  }
}

/* ===== 导航 ===== */
.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__link {
  display: block;
  padding: 12px 20px;
  font-size: 1rem;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  letter-spacing: 1px;
  line-height: 1.4;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.site-nav__link:hover {
  color: var(--text-primary);
  background: rgba(212, 175, 55, 0.08);
}

.site-nav__link[aria-current="page"] {
  color: #d4af37;
  background: rgba(212, 175, 55, 0.12);
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.32);
}

.site-nav__link.is-highlighted:not([aria-current="page"]) {
  color: #d4af37;
  background: transparent;
  box-shadow: none;
  border-bottom: 1px solid #d4af37;
  border-radius: 0;
}

@media (max-width: 767px) {
  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    width: min(340px, 88vw);
    background: var(--elevated-bg);
    border-left: 1px solid var(--gold-dim);
    padding: 28px 20px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    box-shadow: -16px 0 32px rgba(10, 25, 48, 0.45);
    z-index: 120;
  }

  .site-nav[data-open] {
    transform: translateX(0);
  }

  .site-nav__list {
    gap: 4px;
  }

  .site-nav__link {
    font-size: 1.05rem;
    padding: 14px 22px;
  }
}

@media (min-width: 768px) {
  .site-nav {
    position: static;
    background: transparent;
    border-left: none;
    box-shadow: none;
    padding: 0;
    transform: none;
    transition: none;
    overflow: visible;
  }

  .site-nav__list {
    flex-direction: row;
    gap: 2px;
  }

  .site-nav__link {
    font-size: 0.9rem;
    padding: 8px 14px;
    border-radius: var(--radius-pill);
    white-space: nowrap;
  }
}

@media (min-width: 1024px) {
  .site-nav__link {
    padding: 9px 20px;
    font-size: 0.95rem;
  }
}

/* ===== 头部操作区 ===== */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.site-search-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}

.site-search-toggle:hover {
  color: #d4af37;
  background: rgba(212, 175, 55, 0.1);
}

.site-search-toggle[aria-expanded="true"] {
  color: #d4af37;
  background: rgba(212, 175, 55, 0.1);
}

/* ===== 搜索面板 ===== */
.site-search {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--elevated-bg);
  border-bottom: 1px solid var(--gold-dim);
  padding: 16px var(--container-pad);
  display: none;
  align-items: center;
  gap: 12px;
  box-shadow: 0 16px 32px rgba(10, 25, 48, 0.5);
  z-index: 110;
}

.site-search.is-open {
  display: flex;
}

.site-search__icon {
  color: #d4af37;
  flex-shrink: 0;
}

.site-search__input {
  flex: 1;
  min-width: 0;
  background: rgba(10, 25, 48, 0.65);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 10px 18px;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search__input::placeholder {
  color: rgba(201, 185, 138, 0.6);
}

.site-search__input:focus {
  border-color: #d4af37;
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.12);
}

.site-search__hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  display: none;
}

@media (min-width: 768px) {
  .site-search__hint {
    display: inline;
  }
}

/* ===== 移动端汉堡按钮 ===== */
.site-nav-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  margin-left: 4px;
}

.site-nav-toggle__line {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

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

/* ===== 阅读进度条 ===== */
.site-header__progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, #d4af37, #f0e0a0);
  width: 0;
  z-index: 130;
  pointer-events: none;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--primary-bg);
  border-top: 1px solid var(--gold-dim);
  position: relative;
  padding-top: 56px;
  margin-top: 80px;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #d4af37 30%, #d4af37 70%, transparent);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  padding-bottom: 44px;
}

.site-footer__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-footer__logo-mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 2px solid #d4af37;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: #d4af37;
  position: relative;
}

.site-footer__logo-mark::before {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 50%;
}

.site-footer__logo-text {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: 3px;
  color: var(--text-primary);
}

.site-footer__tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 12px;
  letter-spacing: 1px;
}

.site-footer__trust {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-top: 18px;
  max-width: 36em;
  border-left: 2px solid var(--gold-dim);
  padding-left: 16px;
}

.site-footer__columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.site-footer__heading {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: #d4af37;
}

.site-footer__contact-list,
.site-footer__link-list {
  display: grid;
  gap: 10px;
}

.site-footer__contact-list li {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-secondary);
  display: flex;
  gap: 8px;
}

.site-footer__label {
  color: var(--text-primary);
  flex-shrink: 0;
}

.site-footer__link-list a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.site-footer__link-list a:hover {
  color: #d4af37;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-block: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

@media (max-width: 767px) {
  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-bottom: 32px;
  }

  .site-footer__columns {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 1px;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn--gold {
  background: #d4af37;
  color: #0a1930;
  font-weight: 600;
  border-color: #d4af37;
}

.btn--gold:hover {
  background: #e0c455;
  border-color: #e0c455;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
  transform: translateY(-1px);
}

/* ===== 通用面板与卡片 ===== */
.panel {
  background: var(--elevated-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 40px);
  position: relative;
}

.panel::after {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 40px;
  height: 40px;
  border-top: 2px solid #d4af37;
  border-left: 2px solid #d4af37;
  border-top-left-radius: var(--radius-lg);
  pointer-events: none;
}

.card {
  background: var(--elevated-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: rgba(212, 175, 55, 0.45);
  box-shadow: 0 6px 24px rgba(10, 25, 48, 0.4);
  transform: translateY(-2px);
}

/* ===== 章节 ===== */
.section {
  padding-block: clamp(56px, 8vw, 96px);
}

.section__header {
  margin-bottom: 40px;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3vw, 3rem);
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: 2px;
}

/* ===== 金色分割线 ===== */
.divider-gold {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, transparent, var(--gold-dim) 25%, #d4af37 50%, var(--gold-dim) 75%, transparent);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  list-style: none;
}

.breadcrumb__link {
  color: var(--text-secondary);
  transition: color var(--transition);
}

.breadcrumb__link:hover {
  color: #d4af37;
}

.breadcrumb__link[aria-current="page"] {
  color: #d4af37;
}

.breadcrumb__separator {
  color: var(--gold-dim);
}

/* ===== 页面首屏 ===== */
.page-hero {
  padding-block: clamp(48px, 8vw, 96px);
  position: relative;
  background:
    radial-gradient(circle at 80% 10%, rgba(212, 175, 55, 0.12) 0, transparent 26%),
    radial-gradient(circle at 12% 85%, rgba(212, 175, 55, 0.05) 0, transparent 22%),
    linear-gradient(135deg, rgba(10, 25, 48, 0.88) 0%, rgba(20, 41, 77, 0.55) 100%);
}

/* ===== 图片容器 ===== */
.image-frame {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--elevated-bg);
  aspect-ratio: 16 / 9;
  position: relative;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame__caption {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 8px 4px 0;
  text-align: right;
}

/* ===== 提示条 ===== */
.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: rgba(212, 175, 55, 0.07);
  border: 1px solid var(--gold-dim);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.notice--alert {
  background: rgba(139, 0, 0, 0.16);
  border-color: rgba(139, 0, 0, 0.4);
  color: #eacaca;
}

/* ===== 栅格 ===== */
.grid {
  display: grid;
  gap: 24px;
}

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

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

@media (max-width: 767px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

/* ===== 正文排版容器 ===== */
.prose {
  max-width: 65ch;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1rem;
}

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-serif);
  color: var(--text-primary);
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

.prose h2 {
  font-size: 1.8rem;
}

.prose h3 {
  font-size: 1.4rem;
}

.prose p {
  margin-bottom: 1em;
}

/* ===== 滚动显现 ===== */
[data-scroll-spy].is-reveal-pending {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-scroll-spy].is-in-view {
  opacity: 1;
  transform: none;
}

/* ===== 可访问性与减少动效 ===== */
@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-scroll-spy].is-reveal-pending {
    opacity: 1;
    transform: none;
    transition: none;
  }
}