/* ============ 变量与重置 ============ */
:root {
  --color-pitch: #1B3A2D;
  --color-pitch-dark: #122A20;
  --color-gold: #D4AF37;
  --color-gold-deep: #C9A227;
  --color-bg: #F4F5F7;
  --color-ink: #111820;
  --color-paper: #E8E4D9;
  --color-teal: #00E5A0;
  --color-purple: #7B5BFF;
  --color-mist: #9AA5A5;
  --color-charcoal: #2E3B3E;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Cascadia Mono", "JetBrains Mono", "Consolas", monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --shadow-brutal: 6px 6px 0 rgba(17, 24, 32, 0.18);
  --shadow-brutal-hover: 4px 4px 0 rgba(17, 24, 32, 0.25);

  --border-thick: 3px;
  --border-medium: 2px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#main-content {
  flex: 1;
  display: block;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  line-height: 1.3;
  color: var(--color-ink);
  font-weight: 900;
}

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

::selection {
  background: var(--color-gold);
  color: var(--color-ink);
}

/* ============ 布局基础 ============ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: clamp(16px, 4vw, 40px);
  padding-right: clamp(16px, 4vw, 40px);
}

.content-wrap {
  max-width: 768px;
  margin: 0 auto;
  padding: var(--space-2xl) 0;
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

/* ============ Skip Link ============ */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 9999;
  background: var(--color-pitch);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--color-gold);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 8px;
}

/* ============ 滚动进度条 ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-teal);
  z-index: 6000;
  pointer-events: none;
  transition: width 0.1s linear;
}

/* ============ 页头 ============ */
.site-header {
  background: var(--color-pitch);
  background-image:
    repeating-linear-gradient(90deg, transparent 0, transparent 95px, rgba(212, 175, 55, 0.06) 95px, rgba(212, 175, 55, 0.06) 96px);
  color: var(--color-bg);
  border-bottom: 4px solid var(--color-gold);
  position: relative;
  z-index: 1000;
}

.header-inner {
  padding-top: 0;
  padding-bottom: 0;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
  padding: 1.25rem 0 1rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

/* 品牌区 */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
  color: var(--color-bg);
}

.brand-field {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: rgba(212, 175, 55, 0.08);
  border: 2px solid var(--color-gold);
  border-radius: 3px;
  position: relative;
  flex-shrink: 0;
}

.brand-field-line {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 50%;
  width: 1.5px;
  background: var(--color-gold);
  transform: translateX(-50%);
  opacity: 0.8;
}

.brand-field-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--color-gold);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 1.3125rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--color-bg);
}

.brand-line {
  font-size: 0.75rem;
  color: rgba(244, 245, 247, 0.72);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* 页头右侧 */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-note {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.7rem;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gold);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.note-dot {
  width: 6px;
  height: 6px;
  background: var(--color-teal);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============ 主导航 ============ */
.main-nav {
  display: flex;
  align-items: stretch;
  position: relative;
}

.nav-toggle {
  display: none;
}

.nav-list {
  display: flex;
  width: 100%;
}

.nav-item {
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.875rem 1rem;
  color: var(--color-bg);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.nav-link-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-gold);
  opacity: 0.75;
  letter-spacing: 0.05em;
}

.nav-link-text {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  border-bottom-color: var(--color-gold);
}

.nav-link:hover .nav-link-index,
.nav-link[aria-current="page"] .nav-link-index {
  opacity: 1;
}

.nav-link[aria-current="page"] {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
  background: rgba(212, 175, 55, 0.1);
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-charcoal);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  color: rgba(244, 245, 247, 0.85);
  border-top: 4px solid var(--color-gold);
  margin-top: auto;
  position: relative;
}

.footer-inner {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr;
  gap: var(--space-xl);
}

.footer-col-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-brand-name {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  line-height: 1.3;
}

.footer-brand-line {
  font-size: 0.875rem;
  color: rgba(244, 245, 247, 0.65);
}

.footer-statement {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(244, 245, 247, 0.6);
  border-left: 3px solid var(--color-gold-deep);
  padding-left: var(--space-md);
}

.footer-heading {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-bg);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-bottom: 0.625rem;
  margin-bottom: var(--space-md);
  border-bottom: 2px solid rgba(212, 175, 55, 0.35);
}

.footer-link-list,
.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link-list a {
  color: rgba(244, 245, 247, 0.85);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}

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

.footer-contact-list li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(244, 245, 247, 0.8);
}

.footer-note {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  line-height: 1.7;
  color: rgba(244, 245, 247, 0.5);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
  color: rgba(244, 245, 247, 0.45);
}

.copyright,
.footer-icp {
  font-family: var(--font-mono);
}

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-pitch);
  border: 2px solid var(--color-gold);
  color: var(--color-gold);
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.25);
  border-radius: 3px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity var(--transition-base),
    transform var(--transition-base),
    visibility var(--transition-base),
    background-color var(--transition-fast);
  z-index: 5000;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--color-pitch-dark);
  border-color: var(--color-gold);
}

.back-top-arrow {
  width: 10px;
  height: 10px;
  border-top: 2px solid currentColor;
  border-left: 2px solid currentColor;
  transform: rotate(45deg) translate(2px, 2px);
  display: inline-block;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--color-pitch);
  background: transparent;
  color: var(--color-pitch);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border-radius: 2px;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.btn:hover {
  background: var(--color-pitch);
  color: var(--color-bg);
  box-shadow: 4px 4px 0 rgba(27, 58, 45, 0.25);
}

.btn-gold {
  border-color: var(--color-gold-deep);
  background: var(--color-gold);
  color: var(--color-ink);
}

.btn-gold:hover {
  background: var(--color-gold-deep);
  color: var(--color-bg);
  box-shadow: 4px 4px 0 rgba(201, 162, 39, 0.3);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  padding: var(--space-md) 0;
  font-size: 0.8125rem;
  color: var(--color-mist);
}

.breadcrumb a {
  color: var(--color-pitch);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

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

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb-item::after {
  content: '/';
  color: var(--color-mist);
  margin-left: 0.35rem;
}

.breadcrumb-item:last-child::after {
  content: none;
}

/* ============ 卡片 ============ */
.card {
  background: var(--color-paper);
  border: 2px solid var(--color-pitch);
  box-shadow: var(--shadow-brutal);
  padding: var(--space-lg);
  border-radius: 2px;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-brutal-hover);
  transform: translate(2px, 2px);
}

/* ============ 数据表格 ============ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--color-bg);
}

.data-table th,
.data-table td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid rgba(27, 58, 45, 0.15);
  text-align: left;
}

.data-table th {
  background: var(--color-pitch);
  color: var(--color-bg);
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}

.data-table th:hover {
  background: #245140;
}

.data-table th[aria-sort="ascending"]::after {
  content: ' ▲';
  font-size: 0.625rem;
  color: var(--color-teal);
}

.data-table th[aria-sort="descending"]::after {
  content: ' ▼';
  font-size: 0.625rem;
  color: var(--color-teal);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(232, 228, 217, 0.4);
}

.data-table tbody tr:hover {
  background: rgba(0, 229, 160, 0.06);
}

/* ============ 图片容器 ============ */
.figure {
  margin: 0;
  padding: 0;
}

.img-box {
  position: relative;
  background: var(--color-paper);
  border: 2px solid var(--color-pitch);
  overflow: hidden;
  border-radius: 2px;
}

.img-box::before {
  content: 'IMG';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.25em;
  color: var(--color-mist);
}

.img-box img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-box--hero {
  aspect-ratio: 16 / 9;
}

.img-box--portrait {
  aspect-ratio: 3 / 4;
}

.img-box--square {
  aspect-ratio: 1 / 1;
}

.img-box--wide {
  aspect-ratio: 21 / 9;
}

/* ============ 区块标题与注释 ============ */
.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-gold-deep);
}

.section-title::before {
  content: '';
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  flex-shrink: 0;
}

.label-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-mist);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: inline-block;
}

/* ============ 响应式：移动端 ============ */
@media (max-width: 768px) {
  .header-top {
    padding: 0.875rem 0 0.75rem;
  }

  .brand-field {
    width: 32px;
    height: 32px;
  }

  .brand-field-circle {
    width: 10px;
    height: 10px;
  }

  .brand-name {
    font-size: 1.0625rem;
  }

  .brand-line {
    display: none;
  }

  .header-note {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(212, 175, 55, 0.5);
    border-radius: 2px;
    color: var(--color-bg);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 700;
    cursor: pointer;
    transition:
      background-color var(--transition-fast),
      border-color var(--transition-fast);
  }

  .nav-toggle:hover {
    background: rgba(0, 0, 0, 0.35);
    border-color: var(--color-gold);
  }

  .nav-toggle-lines {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 3px;
    width: 16px;
  }

  .nav-toggle-line {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--color-gold);
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .main-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    background: var(--color-pitch-dark);
    border-top: 1px solid rgba(212, 175, 55, 0.2);
  }

  .main-nav[data-open] .nav-list {
    display: flex;
  }

  .nav-item {
    flex: none;
  }

  .nav-link {
    padding: 0.8125rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-left: 3px solid transparent;
  }

  .nav-link:hover {
    background: rgba(255, 255, 255, 0.04);
    border-bottom-color: rgba(255, 255, 255, 0.06);
    border-left-color: var(--color-gold);
  }

  .nav-link[aria-current="page"] {
    border-left-color: var(--color-gold);
    border-bottom-color: rgba(255, 255, 255, 0.06);
  }

  .nav-link[aria-expanded] {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ============ 平板与桌面 ============ */
@media (min-width: 769px) {
  .nav-toggle {
    display: none !important;
  }
}

@media (min-width: 769px) and (max-width: 1023px) {
  .brand-line {
    font-size: 0.6875rem;
  }

  .header-note {
    font-size: 0.6875rem;
    padding: 0.25rem 0.5rem;
  }

  .nav-link {
    padding: 0.75rem 0.5rem;
    gap: 0.4rem;
  }

  .nav-link-text {
    font-size: 0.875rem;
  }

  .nav-link-index {
    font-size: 0.625rem;
  }

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

@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;
  }
}