@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@400;500;600;700&family=Comic+Neue:wght@300;400;700&display=swap');

/* ===== CSS 变量 ===== */
:root {
  --mint: #b4fde1;
  --fog-blue: #add8e6;
  --ink: #172620;
  --ink-80: rgba(23,38,32,0.8);
  --ink-40: rgba(23,38,32,0.4);
  --ink-10: rgba(23,38,32,0.08);
  --mint-dark: #7de8c0;
  --blue-dark: #7ab8cc;
  --white: #ffffff;
  --bg: #edfff8;
  --bg2: #e8f6f0;
  --card-bg: #f5fffe;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --border-w: 3px;
  --shadow-clay: 4px 6px 12px rgba(23,38,32,0.18), inset -2px -3px 8px rgba(23,38,32,0.10);
  --shadow-clay-hover: 6px 8px 18px rgba(23,38,32,0.24), inset -2px -3px 8px rgba(23,38,32,0.12);
  --shadow-pressed: 2px 2px 6px rgba(23,38,32,0.18), inset 2px 3px 8px rgba(23,38,32,0.14);
  --nav-h-brand: 64px;
  --nav-h-menu: 52px;
  --nav-total: 116px;
  --font-main: 'Baloo 2', 'Comic Neue', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --transition: 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button, input { font-family: inherit; }

/* ===== 全局 scroll-margin ===== */
section[id] {
  scroll-margin-top: calc(var(--nav-total) + 16px);
}

/* ===== 站点容器 ===== */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== 页头 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--mint);
  border-bottom: var(--border-w) solid var(--ink);
  box-shadow: 0 4px 12px rgba(23,38,32,0.14);
}

.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: var(--nav-h-brand);
  border-bottom: 2px solid rgba(23,38,32,0.12);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  transition: transform var(--transition);
}
.brand-link:hover { transform: scale(1.04); }
.brand-text {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand-logo { height: 40px; width: auto; }
.brand-mark { height: 32px; width: 32px; }

/* 搜索框 */
.search-form {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--white);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-clay);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.search-form:focus-within {
  box-shadow: var(--shadow-clay-hover);
}
.search-input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.95rem;
  color: var(--ink);
  width: 200px;
}
.search-btn {
  border: none;
  background: var(--fog-blue);
  border-left: 2px solid var(--ink);
  padding: 8px 14px;
  cursor: pointer;
  font-size: 1rem;
  transition: background var(--transition);
  min-height: 40px;
}
.search-btn:hover { background: var(--blue-dark); }

/* 导航菜单行 */
.site-nav {
  height: var(--nav-h-menu);
  display: flex;
  align-items: center;
  padding: 0 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.site-nav::-webkit-scrollbar { display: none; }
.site-nav > p {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.site-nav > p > a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.site-nav > p > a:hover,
.site-nav > p > a:focus-visible {
  background: var(--white);
  border-color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transform: translateY(-2px);
}
.site-nav > p > a:active {
  transform: translateY(0);
  box-shadow: 1px 1px 0 var(--ink);
}

/* ===== Hero ===== */
.hero-wrap {
  position: relative;
  min-height: 45vh;
  background: linear-gradient(135deg, var(--mint) 0%, var(--fog-blue) 100%);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.hero-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px 72px;
  position: relative;
  z-index: 2;
}
.hero-figure {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
}
.hero-figure .hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
}
.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 680px;
}
.hero-h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 2px 3px 0 rgba(255,255,255,0.6);
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--ink-80);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}
.hero-arc {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 3;
}

/* ===== 主体 ===== */
.site-main {
  flex: 1;
  width: 100%;
}

.content-section {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  align-items: start;
}

/* ===== aside ===== */
.content-aside {
  position: sticky;
  top: calc(var(--nav-total) + 20px);
  background: var(--card-bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay);
  padding: 24px 20px;
}
.aside-eyebrow {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-40);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.aside-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--mint-dark);
}
.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.aside-link {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  line-height: 1.4;
}
.aside-link:hover {
  background: var(--mint);
  border-color: var(--ink);
  transform: translateX(4px);
}

/* ===== 正文 figure ===== */
.content-figure {
  margin: 0;
  min-width: 0;
}
.page-content {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* page.content 里的 section 样式 */
.page-content section {
  background: var(--card-bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay);
  padding: 36px 32px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.page-content section:hover {
  box-shadow: var(--shadow-clay-hover);
  transform: translateY(-3px);
}

.page-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.3;
}
.page-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
  margin: 20px 0 10px;
}
.page-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-80);
  margin-bottom: 12px;
}
.page-content p:last-child { margin-bottom: 0; }
.page-content ul,
.page-content ol {
  padding-left: 1.4em;
  margin-bottom: 12px;
}
.page-content li {
  line-height: 1.7;
  margin-bottom: 6px;
  font-size: 1rem;
  color: var(--ink-80);
}
.page-content strong { color: var(--ink); font-weight: 700; }
.page-content a {
  color: var(--ink);
  border-bottom: 2px solid var(--mint-dark);
  transition: border-color var(--transition), background var(--transition);
  padding: 0 2px;
  border-radius: 3px;
}
.page-content a:hover {
  background: var(--mint);
  border-color: transparent;
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.95rem;
}
.page-content th,
.page-content td {
  border: 2px solid var(--ink);
  padding: 10px 14px;
  text-align: left;
}
.page-content th {
  background: var(--mint);
  font-weight: 700;
}
.page-content tr:nth-child(even) td {
  background: rgba(180,253,225,0.2);
}
.page-content blockquote {
  border-left: 4px solid var(--mint-dark);
  background: rgba(173,216,230,0.2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 20px;
  margin: 16px 0;
  font-style: italic;
  color: var(--ink-80);
}
.page-content code {
  background: rgba(23,38,32,0.08);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.9em;
  font-family: 'Courier New', monospace;
}
.page-content pre {
  background: var(--ink);
  color: var(--mint);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin: 16px 0;
}
.page-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* section 内部区分色 */
.page-content section:nth-child(2n) {
  background: linear-gradient(135deg, rgba(173,216,230,0.18) 0%, var(--card-bg) 100%);
}
.page-content section:nth-child(3n) {
  background: linear-gradient(135deg, rgba(180,253,225,0.18) 0%, var(--card-bg) 100%);
}

/* ===== 页脚 ===== */
.site-footer {
  margin-top: 64px;
  background: var(--ink);
  color: var(--white);
  border-top: var(--border-w) solid var(--ink);
}

.footer-cta-block {
  background: linear-gradient(135deg, var(--mint) 0%, var(--fog-blue) 100%);
  border-bottom: var(--border-w) solid rgba(23,38,32,0.3);
  padding: 48px 24px;
  text-align: center;
}
.footer-eyebrow {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink-40);
  margin-bottom: 8px;
}
.footer-cta-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}
.footer-cta-desc {
  font-size: 1rem;
  color: var(--ink-80);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px;
}

.footer-logo-area {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--mint);
  transition: opacity var(--transition);
}
.footer-brand-link:hover { opacity: 0.8; }
.footer-brand-name { font-weight: 700; }
.footer-tagline {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.92rem;
  color: rgba(255,255,255,0.75);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}
.footer-nav-link:hover {
  color: var(--mint);
  background: rgba(180,253,225,0.1);
  transform: translateX(4px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.contact-eyebrow {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 4px;
}
.contact-item {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.72);
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  padding: 20px 24px;
}
.footer-copy,
.footer-beian {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  line-height: 1.6;
}

/* ===== 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .site-nav > p > a,
  .aside-link,
  .footer-nav-link,
  .page-content section,
  .search-btn,
  .brand-link {
    will-change: transform;
  }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .content-section {
    grid-template-columns: 1fr;
  }
  .content-aside {
    position: static;
    order: -1;
  }
  .aside-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
  .footer-logo-area {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  :root {
    --nav-h-brand: 56px;
    --nav-h-menu: 48px;
    --nav-total: 104px;
  }
  .header-brand-row {
    padding: 0 16px;
  }
  .search-input {
    width: 120px;
  }
  .site-nav {
    padding: 0 16px;
  }
  .site-nav > p > a {
    padding: 0 10px;
    font-size: 0.88rem;
  }
  .hero-inner {
    padding: 36px 16px 60px;
  }
  .hero-h1 {
    font-size: 1.8rem;
  }
  .content-section {
    padding: 24px 16px;
    gap: 20px;
  }
  .page-content section {
    padding: 24px 18px;
  }
  .footer-main {
    grid-template-columns: 1fr;
  }
  .footer-cta-block {
    padding: 36px 16px;
  }
}

@media (max-width: 375px) {
  .hero-h1 { font-size: 1.5rem; }
  .search-input { width: 90px; }
  .page-content section { padding: 18px 14px; }
}