/* ========== Reset & Variables ========== */
:root {
  --color-deep: #0A192F;
  --color-night: #112240;
  --color-gold: #D4AF37;
  --color-gold-light: #FFD700;
  --color-gold-soft: #E6D5A8;
  --color-orange: #FF6B35;
  --color-ash: #8892B0;
  --color-gray: #233554;
  --color-white: #FFFFFF;
  --gradient-gold: linear-gradient(135deg, #D4AF37, #FFD700);
  --gradient-page: linear-gradient(180deg, #0A192F 0%, #0D1B2E 100%);
  --font-heading: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.3);
  --border-thick: 3px solid #233554;
  --container: 1280px;
  --radius: 14px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--color-deep);
  color: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

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

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-orange);
  outline-offset: 4px;
  border-radius: 4px;
}

::selection {
  background: rgba(212, 175, 55, 0.3);
  color: var(--color-white);
}

/* ========== 通用内容容器 ========== */
.site-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ========== 跳过链接 ========== */
.site-skip {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 2000;
  padding: 0.75rem 1.25rem;
  background: var(--color-orange);
  color: var(--color-white);
  font-weight: 700;
  border-radius: 0 0 8px 8px;
  transition: top 0.3s ease;
}

.site-skip:focus-visible {
  top: 0;
}

/* ========== Header ========== */
.site-header {
  background: var(--color-deep);
  border-bottom: var(--border-thick);
  position: relative;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 72px;
  flex-wrap: wrap;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
  white-space: nowrap;
}

.site-header__brand-mark {
  width: 14px;
  height: 14px;
  background: var(--gradient-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.8);
  flex-shrink: 0;
}

.site-header__brand-text {
  background: linear-gradient(135deg, #FFFFFF, #E6D5A8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 导航 */
.site-header__nav {
  order: 1;
  width: 100%;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  padding: 0.5rem 0;
}

.site-nav__link {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-ash);
  border-left: 3px solid transparent;
  border-radius: 0 6px 6px 0;
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.site-nav__link:hover {
  color: var(--color-gold-soft);
  background: rgba(212, 175, 55, 0.06);
  border-left-color: rgba(212, 175, 55, 0.4);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-gold-soft);
  border-left-color: var(--color-gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.12), transparent);
  font-weight: 700;
}

/* Header 右侧操作 */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color-gray);
  border-radius: 999px;
  background: rgba(17, 34, 64, 0.6);
}

.lang-switch__label {
  font-size: 0.8rem;
  color: var(--color-ash);
}

.lang-switch__btn {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-gold-soft);
  padding: 0.2rem 0.4rem;
  border-radius: 999px;
  transition: background 0.3s ease, color 0.3s ease;
}

.lang-switch__btn:hover {
  background: rgba(212, 175, 55, 0.15);
}

.lang-switch__btn[aria-pressed="true"] {
  background: var(--gradient-gold);
  color: #0A192F;
}

.collect-entry {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 2px solid transparent;
  background: var(--gradient-gold);
  background-origin: border-box;
  background-clip: padding-box, border-box;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: #0A192F;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.collect-entry::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 999px;
  background: linear-gradient(135deg, #D4AF37, #FF6B35);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s ease;
}

.collect-entry:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.35);
}

.collect-entry:hover::after {
  opacity: 1;
}

.collect-entry__icon {
  font-size: 1rem;
  color: inherit;
}

/* 移动导航按钮 */
.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--color-gray);
  border-radius: 10px;
  background: var(--color-night);
  align-items: center;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.site-header__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gold-soft);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 阅读进度条 */
.reading-progress {
  position: sticky;
  top: 0;
  z-index: 1500;
  height: 4px;
  background: transparent;
  pointer-events: none;
}

.reading-progress::before {
  content: '';
  display: block;
  height: 100%;
  width: 0%;
  background: var(--gradient-gold);
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.6);
}

/* ========== Footer ========== */
.site-footer {
  background: #071426;
  border-top: var(--border-thick);
  padding-top: 3rem;
  margin-top: auto;
  color: var(--color-white);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding-bottom: 2.5rem;
}

.footer-brand__name {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.6rem;
  background: linear-gradient(135deg, #FFFFFF, #E6D5A8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.footer-brand__desc,
.footer-brand__trust {
  font-size: 0.95rem;
  color: var(--color-ash);
  margin-bottom: 0.75rem;
  max-width: 32ch;
}

.footer-brand__trust {
  color: var(--color-gold-soft);
  border-left: 3px solid var(--color-gold);
  padding-left: 0.75rem;
  font-weight: 500;
}

.footer-links__heading,
.footer-contact .footer-links__heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-gold-soft);
  margin-bottom: 1rem;
  letter-spacing: 0.03em;
}

.footer-links__list,
.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  list-style: none;
}

.footer-links__list a {
  color: var(--color-ash);
  font-size: 0.95rem;
  position: relative;
  padding-left: 0;
  transition: color 0.3s ease, padding-left 0.3s ease;
}

.footer-links__list a::before {
  content: '▸';
  color: var(--color-gold);
  margin-right: 0.4rem;
  opacity: 0.6;
}

.footer-links__list a:hover {
  color: var(--color-white);
  padding-left: 0.25rem;
}

.footer-contact__list li {
  color: var(--color-ash);
  font-size: 0.95rem;
}

.footer-contact__list a {
  color: var(--color-gold-soft);
  transition: color 0.3s ease;
}

.footer-contact__list a:hover {
  color: var(--color-orange);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray);
  padding: 1.25rem 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-ash);
}

.footer-bottom__icp a,
.footer-bottom__copyright {
  color: var(--color-ash);
  transition: color 0.3s ease;
}

.footer-bottom__icp a:hover {
  color: var(--color-gold-soft);
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease, color 0.3s ease;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--gradient-gold);
  color: #0A192F;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.4);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-gold);
  color: var(--color-gold-soft);
}

.btn--ghost:hover {
  background: rgba(212, 175, 55, 0.08);
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.2);
}

.btn--orange {
  background: var(--color-orange);
  color: #FFFFFF;
}

.btn--orange:hover {
  background: #e85a2a;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}

/* ========== 面板、卡片栅格 ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

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

.info-card {
  background: var(--color-night);
  border: var(--border-thick);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.info-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(212, 175, 55, 0.15);
  border-color: rgba(212, 175, 55, 0.7);
}

/* ========== 章节标题 ========== */
.section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-white);
  position: relative;
  padding-left: 1.5rem;
}

.section-title::before {
  content: '01';
  position: absolute;
  left: 0;
  top: 0.1rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-gold);
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title--02::before { content: '02'; }
.section-title--03::before { content: '03'; }
.section-title--04::before { content: '04'; }

.section-subtitle {
  color: var(--color-ash);
  font-size: 1.125rem;
  margin-bottom: 2rem;
  max-width: 56ch;
}

/* ========== 分割线 ========== */
.divider-glow {
  height: 2px;
  background: var(--gradient-gold);
  border: none;
  margin: 3rem 0;
  position: relative;
  opacity: 0.8;
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
}

/* ========== 内容宽度 ========== */
.content-narrow {
  max-width: 72ch;
}

.content-wide {
  max-width: 100%;
}

/* ========== 图片容器基础规则 ========== */
.ph {
  border: 2px dashed var(--color-gray);
  background: linear-gradient(135deg, rgba(17, 34, 64, 0.6), rgba(10, 25, 47, 0.9));
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  color: var(--color-ash);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.ph::after {
  content: '图片';
  position: relative;
  z-index: 1;
  background: rgba(10, 25, 47, 0.7);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-gray);
}

.ph--tech::before,
.ph--culture::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(212, 175, 55, 0.1), transparent 40%),
              repeating-linear-gradient(45deg, transparent 0px, rgba(136, 146, 176, 0.08) 1px, transparent 12px);
  z-index: 0;
}

.ph--culture::before {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.15), rgba(255, 107, 53, 0.06)),
              repeating-linear-gradient(-45deg, transparent 0px, rgba(255, 255, 255, 0.05) 1px, transparent 20px);
}

.ph--tall {
  min-height: 340px;
}

.ph--short {
  min-height: 140px;
}

/* ========== 页头（内页首屏） ========== */
.page-hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-gray);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.08), transparent 60%);
  pointer-events: none;
}

.page-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #FFFFFF, #E6D5A8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-hero__desc {
  font-size: 1.125rem;
  color: var(--color-ash);
  max-width: 60ch;
}

.page-hero__meta {
  margin-top: 1.25rem;
  display: flex;
  gap: 1rem;
  color: var(--color-gold-soft);
  font-size: 0.9rem;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-ash);
  margin-bottom: 1.5rem;
}

.breadcrumb__sep {
  color: var(--color-gray);
}

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

.breadcrumb .breadcrumb__current {
  color: var(--color-gold-soft);
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.pagination a,
.pagination span {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--color-gray);
  border-radius: 8px;
  color: var(--color-ash);
  font-size: 0.9rem;
  transition: background 0.3s ease, color 0.3s ease;
}

.pagination a:hover {
  border-color: var(--color-gold);
  color: var(--color-gold-soft);
}

.pagination .pagination__current {
  background: var(--gradient-gold);
  color: var(--color-deep);
  border-color: transparent;
  font-weight: 700;
}

/* ========== 装饰图形 ========== */
.svg-mask-decor {
  position: relative;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  pointer-events: none;
}

.svg-mask-decor::before {
  content: '';
  position: absolute;
  width: 180px;
  height: 180px;
  background:
    linear-gradient(135deg, rgba(212, 175, 55, 0.2), transparent 60%),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 4px, transparent 4px, transparent 20px);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

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

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

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

  .section-title {
    font-size: 2rem;
  }

  .page-hero__title {
    font-size: 2.8rem;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    justify-content: space-between;
    padding: 0.75rem 1rem;
  }

  .site-header__brand {
    font-size: 1.2rem;
  }

  .site-header__actions {
    display: none;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    display: none;
    width: 100%;
    order: 2;
    padding-top: 0.5rem;
  }

  .site-header__nav[data-open] {
    display: block;
    animation: nav-in 0.3s ease forwards;
  }

  @keyframes nav-in {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(35, 53, 84, 0.7);
    border-left: 3px solid transparent;
    border-radius: 0;
  }

  .site-nav__link[aria-current="page"] {
    background: linear-gradient(90deg, rgba(212, 175, 55, 0.15), transparent 80%);
    border-left-color: var(--color-gold);
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

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

  .page-hero__title {
    font-size: 2.2rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .ph--tall {
    min-height: 200px;
  }
}

@media (min-width: 769px) {
  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    order: 1;
    flex: 1;
    display: block;
    width: auto;
  }

  .site-nav__list {
    flex-direction: row;
    justify-content: flex-start;
    gap: 0.25rem 0.75rem;
  }

  .site-header__actions {
    order: 2;
  }

  .site-header__brand {
    order: 0;
  }

  .site-header__inner {
    flex-wrap: nowrap;
  }

  .site-header__nav {
    order: 1;
    display: flex;
    align-items: center;
    margin-left: 1rem;
  }

  .site-nav__list {
    width: 100%;
  }
}

/* ========== 动效与可访问性 ========== */
@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;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .section-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .section-reveal.is-visible {
    opacity: 1;
    transform: none;
  }

  .info-card:hover {
    transform: translateY(-6px);
  }
}

/* 滚动顶部和进度条样式 */
.progress-top {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 100%;
  background: rgba(255,255,255,0.05);
  z-index: 9999;
  pointer-events: none;
}

.progress-top__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--gradient-gold);
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.7);
}

/* 滚动显现遮蔽 */
@media (prefers-reduced-motion: reduce) {
  .section-reveal {
    opacity: 1;
    transform: none;
  }
}

/* 语言切换包络 */
.lang-switch--compact {
  display: inline-flex;
  gap: 0.35rem;
  font-size: 0.85rem;
}

/* 页脚收藏提示 */
.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-gold-soft);
  font-size: 0.85rem;
  border: 1px solid var(--color-gray);
}