@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:wght@400;500;600;700&family=Lato:wght@300;400;700&display=swap');

/* =========================================================
   CSS 自定义属性
   ========================================================= */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-border: #000000;
  --c-mid: #444444;
  --c-light: #f5f5f5;
  --c-dot: #cccccc;

  --font-title: 'EB Garamond', Georgia, serif;
  --font-body: 'Lato', Helvetica, Arial, sans-serif;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;

  --radius: 4px;
  --header-h: 60px;
  --max-w: 1200px;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  background: var(--c-white);
  color: var(--c-black);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 600;
  line-height: 1.25;
}

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

a:hover,
a:focus {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--c-black);
  outline-offset: 2px;
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: var(--font-body);
  background: none;
  border: none;
}

input, button {
  font-size: 1rem;
}

/* 无障碍隐藏 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   页头
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-black);
  color: var(--c-white);
  border-bottom: 2px solid var(--c-white);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: var(--space-2);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
  height: var(--header-h);
}

/* 品牌图标 */
.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--c-white);
  border-radius: var(--radius);
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark:hover { opacity: 0.75; text-decoration: none; }

.logo-text-mark {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1;
}

.site-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

/* 主导航 */
.main-nav {
  overflow: hidden;
}

.main-nav ol {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  align-items: center;
  height: var(--header-h);
}

.main-nav ol li a {
  display: flex;
  align-items: center;
  height: var(--header-h);
  padding: 0 var(--space-2);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--c-white);
  letter-spacing: 0.03em;
  white-space: nowrap;
  border-right: 1px solid rgba(255,255,255,0.15);
  transition: background 0.15s;
}

.main-nav ol li:first-child a { border-left: 1px solid rgba(255,255,255,0.15); }
.main-nav ol li a:hover { background: rgba(255,255,255,0.1); text-decoration: none; }

/* 搜索框 */
.nav-search {
  display: flex;
  align-items: center;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: var(--radius);
  overflow: hidden;
  height: 36px;
}

.nav-search input {
  background: transparent;
  border: none;
  color: var(--c-white);
  padding: 0 var(--space-1) 0 var(--space-2);
  width: 150px;
  outline: none;
  font-size: 0.875rem;
}

.nav-search input::placeholder { color: rgba(255,255,255,0.5); }

.nav-search button {
  color: var(--c-white);
  padding: 0 var(--space-1);
  font-size: 1rem;
  line-height: 36px;
  min-width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.nav-search button:hover { background: rgba(255,255,255,0.15); }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-white);
  transition: transform 0.2s;
}

/* 移动导航 */
.mobile-nav {
  background: var(--c-black);
  border-top: 1px solid rgba(255,255,255,0.15);
  padding: var(--space-2) var(--space-3);
}

.mobile-nav ol {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav ol li a {
  display: block;
  padding: var(--space-1) var(--space-2);
  color: var(--c-white);
  font-size: 0.9375rem;
  min-height: 44px;
  display: flex;
  align-items: center;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  transition: background 0.15s;
}

.mobile-nav ol li a:hover { background: rgba(255,255,255,0.1); text-decoration: none; }

/* =========================================================
   Hero 区
   ========================================================= */
.hero-section {
  background: var(--c-black);
  color: var(--c-white);
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  position: relative;
}

.hero-grid {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-6) var(--space-3);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-2);
  align-items: center;
  position: relative;
}

/* 点阵底纹 */
.hero-dot-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.18) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  grid-column: 7 / 13;
  text-align: right;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
}

.hero-icon {
  opacity: 0.85;
}

.hero-h1 {
  font-family: var(--font-title);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-white);
  letter-spacing: -0.01em;
}

.hero-sub {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 300;
  color: rgba(255,255,255,0.75);
  max-width: 36ch;
  line-height: 1.6;
}

/* =========================================================
   scroll-margin for sections
   ========================================================= */
div[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* =========================================================
   主体布局 main > section.wrap > div > article
   ========================================================= */
.site-main {
  flex: 1;
  background: var(--c-white);
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-5) var(--space-3);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-5);
  align-items: start;
}

/* =========================================================
   侧边栏 (左侧)
   ========================================================= */
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + var(--space-3));
  border: 2px solid var(--c-black);
  border-radius: var(--radius);
  overflow: hidden;
}

.aside-inner {
  padding: var(--space-3);
}

.aside-eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-bottom: var(--space-1);
}

.aside-title {
  font-family: var(--font-title);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--c-black);
  padding-bottom: var(--space-1);
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-links li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 6px var(--space-1);
  font-size: 0.875rem;
  color: var(--c-black);
  border-radius: var(--radius);
  transition: background 0.12s;
  line-height: 1.4;
}

.aside-links li a:hover {
  background: var(--c-light);
  text-decoration: none;
}

/* =========================================================
   正文容器 div > article
   ========================================================= */
.content-body {
  min-width: 0;
}

.page-article {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-black);
}

/* ---- 正文内 div（由 page.content 注入）---- */
.page-article div {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid #e0e0e0;
}

.page-article div:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

/* 正文标题 */
.page-article h2 {
  font-family: var(--font-title);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 600;
  margin-bottom: var(--space-3);
  margin-top: var(--space-5);
  line-height: 1.2;
}

.page-article div:first-child h2 {
  margin-top: 0;
}

.page-article h3 {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.page-article h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: var(--space-3);
  margin-bottom: var(--space-1);
}

.page-article p {
  margin-bottom: var(--space-2);
  max-width: 72ch;
}

.page-article ul,
.page-article ol {
  margin-bottom: var(--space-2);
  padding-left: var(--space-3);
}

.page-article ul { list-style: disc; }
.page-article ol { list-style: decimal; }

.page-article li {
  margin-bottom: var(--space-1);
  line-height: 1.65;
}

.page-article a {
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-article a:hover { opacity: 0.65; }

.page-article blockquote {
  border-left: 4px solid var(--c-black);
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  background: var(--c-light);
  font-style: italic;
}

.page-article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-3);
  font-size: 0.9375rem;
}

.page-article th,
.page-article td {
  border: 1px solid var(--c-black);
  padding: var(--space-1) var(--space-2);
  text-align: left;
}

.page-article th {
  background: var(--c-black);
  color: var(--c-white);
  font-weight: 700;
}

.page-article img {
  border-radius: var(--radius);
  border: 2px solid var(--c-black);
  margin: var(--space-3) 0;
}

/* 描边卡片（正文内如果有 .card 类） */
.page-article .card,
.card {
  border: 2px solid var(--c-black);
  border-radius: var(--radius);
  padding: var(--space-3);
  background: var(--c-white);
}

/* small 眉题（紧邻 h2/h3 前） */
.page-article small,
small.aside-eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-bottom: 4px;
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  background: var(--c-black);
  color: rgba(255,255,255,0.65);
  border-top: 2px solid var(--c-black);
}

.site-footer div {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-copy {
  padding: var(--space-2) var(--space-3) 0;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-disclaimer {
  padding: 0 var(--space-3) var(--space-2);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.4);
  line-height: 1.5;
}

/* =========================================================
   Scroll Reveal 动效
   ========================================================= */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.55s cubic-bezier(0.22,1,0.36,1), transform 0.55s cubic-bezier(0.22,1,0.36,1);
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
  .reveal-left {
    opacity: 0;
    transform: translateX(-24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .reveal-left.visible {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-left { opacity: 1; transform: none; }
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 960px) {
  .wrap {
    grid-template-columns: 1fr;
  }
  .content-aside {
    position: static;
    border: 2px solid var(--c-black);
  }
  .aside-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  .header-inner {
    grid-template-columns: auto 1fr auto;
    padding: 0 var(--space-2);
  }

  .main-nav {
    display: none;
  }

  .nav-search {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    grid-column: 1 / 13;
    text-align: right;
    align-items: flex-end;
  }

  .hero-grid {
    padding: var(--space-5) var(--space-2);
  }

  .wrap {
    padding: var(--space-4) var(--space-2);
    gap: var(--space-3);
  }

  .aside-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 1.75rem;
  }
  .hero-sub {
    font-size: 0.9375rem;
  }
  .page-article h2 {
    font-size: 1.35rem;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}