@import url('https://fonts.googleapis.com/css2?family=Anton&family=Epilogue:wght@400;500;600;700&display=swap');

/* ============================================================
   CSS 自定义属性
   ============================================================ */
:root {
  --c-primary: #5cc6b0;
  --c-sand: #d4c4a8;
  --c-dark: #172623;
  --c-dark-80: rgba(23,38,35,0.80);
  --c-dark-50: rgba(23,38,35,0.50);
  --c-terracotta: #c67b5c;
  --c-olive: #6b7b3c;
  --c-bg: #f5ede0;
  --c-bg2: #ede0cc;
  --c-surface: #f9f4ec;
  --c-border: #c8b89a;
  --c-text: #2a1f18;
  --c-text-muted: #6b5d4f;
  --c-link: #2e7d6b;
  --sidebar-w: 240px;
  --top-banner-h: 36px;
  --font-title: 'Anton', 'Impact', sans-serif;
  --font-body: 'Epilogue', 'Segoe UI', system-ui, sans-serif;
  --transition-std: 0.22s ease-out;
  --radius-card: 0;
  --shadow-soft: 2px 4px 16px rgba(23,38,35,0.10);
}

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

html {
  scroll-behavior: smooth;
  font-size: 17px;
  background: var(--c-bg);
  color: var(--c-text);
}

body {
  font-family: var(--font-body);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 滚动偏移（固定侧边导航补偿） */
div[id] {
  scroll-margin-top: calc(var(--top-banner-h) + 24px);
}

a { color: var(--c-link); text-decoration: none; }
a:hover { text-decoration: underline; }
img { display: block; max-width: 100%; height: auto; }
ul { list-style: none; }

/* ============================================================
   纹理叠层（grain 效果，伪元素）
   ============================================================ */
.site-wrapper::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ============================================================
   站点外层
   ============================================================ */
.site-wrapper {
  display: flex;
  flex-direction: row;
  min-height: 100vh;
  position: relative;
}

/* ============================================================
   顶部公告条
   ============================================================ */
.top-banner {
  position: fixed;
  top: 0;
  left: var(--sidebar-w);
  right: 0;
  height: var(--top-banner-h);
  background: var(--c-dark);
  color: var(--c-primary);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 400;
  border-bottom: 1px solid var(--c-primary);
}

/* ============================================================
   左侧固定竖排导航  aside > nav > ul > li > a
   ============================================================ */
.sidebar-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--c-dark);
  display: flex;
  flex-direction: column;
  z-index: 500;
  border-right: 2px solid var(--c-primary);
  overflow-y: auto;
  overflow-x: hidden;
}

.brand-block {
  padding: 28px 20px 20px;
  border-bottom: 1px solid rgba(92,198,176,0.25);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.brand-logo-link { display: block; }
.brand-logo-img { width: 40px; height: 40px; object-fit: contain; }

.brand-name {
  font-family: var(--font-title);
  font-size: 1.5rem;
  color: var(--c-primary);
  letter-spacing: 0.04em;
  line-height: 1.1;
  text-decoration: none !important;
  word-break: break-word;
}
.brand-name:hover { color: var(--c-sand); }

.sidebar-nav nav { flex: 1; padding: 16px 0; }

.sidebar-nav nav ul { display: flex; flex-direction: column; gap: 2px; }

.sidebar-nav nav ul li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  color: var(--c-sand);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  border-left: 3px solid transparent;
  transition: color var(--transition-std), border-color var(--transition-std), background var(--transition-std);
}

.sidebar-nav nav ul li a:hover {
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  background: rgba(92,198,176,0.08);
  text-decoration: none;
}

/* stagger 动画 */
@media (prefers-reduced-motion: no-preference) {
  .sidebar-nav nav ul li {
    opacity: 0;
    transform: translateX(-12px);
    animation: navSlideIn var(--transition-std) forwards;
    animation-delay: calc(var(--i, 0) * 60ms + 150ms);
  }
  @keyframes navSlideIn {
    to { opacity: 1; transform: translateX(0); }
  }
}

.sidebar-tagline {
  padding: 16px 20px 24px;
  font-size: 0.72rem;
  color: var(--c-dark-50);
  color: rgba(212,196,168,0.4);
  line-height: 1.4;
  border-top: 1px solid rgba(92,198,176,0.12);
}

/* ============================================================
   主内容区
   ============================================================ */
.main-content-area {
  margin-left: var(--sidebar-w);
  margin-top: var(--top-banner-h);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--top-banner-h));
}

/* ============================================================
   Hero 区块
   ============================================================ */
.hero-block {
  position: relative;
  min-height: 70vh;
  background: var(--c-dark);
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

/* 斜切色带 */
.hero-slash {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-bg);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 3;
}

.hero-img-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.hero-img-layer .hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.28;
  filter: saturate(0.7) sepia(0.2);
}

.hero-img-placeholder {
  background: linear-gradient(135deg, #2a1f18 0%, var(--c-dark) 60%, #1e3d35 100%);
}

@media (prefers-reduced-motion: no-preference) {
  .hero-img-layer .hero-img {
    transform: scale(1.04);
    transition: transform 8s ease-out;
  }
  .hero-block:hover .hero-img-layer .hero-img {
    transform: scale(1.0);
  }
}

.hero-text-layer {
  position: relative;
  z-index: 2;
  padding: 64px 56px 100px;
  max-width: 760px;
}

.hero-h1 {
  font-family: var(--font-title);
  font-size: clamp(2.8rem, 6vw, 5rem);
  color: #fff;
  letter-spacing: 0.03em;
  line-height: 1.05;
  margin-bottom: 20px;
  text-transform: uppercase;
}

/* 色带下划线装饰 */
.hero-h1::after {
  content: '';
  display: block;
  width: 72px;
  height: 4px;
  background: var(--c-primary);
  margin-top: 16px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--c-sand);
  max-width: 540px;
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 32px;
  background: var(--c-primary);
  color: var(--c-dark);
  font-family: var(--font-title);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  border: 2px solid var(--c-primary);
  border-radius: var(--radius-card);
  cursor: pointer;
  transition: background var(--transition-std), color var(--transition-std), border-color var(--transition-std);
  text-decoration: none !important;
}

.hero-cta:hover {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}

/* ============================================================
   正文主容器  main > article.wrap > div > section
   ============================================================ */
.page-main {
  display: flex;
  flex-direction: row;
  flex: 1;
  align-items: flex-start;
  gap: 0;
  background: var(--c-bg);
  padding: 56px 0 0;
}

.wrap {
  flex: 1;
  min-width: 0;
  padding: 0 40px 56px 48px;
}

.content-section {
  width: 100%;
}

.content-article {
  max-width: 820px;
}

/* ============================================================
   正文内部样式（page.content 里的元素）
   ============================================================ */
.content-article h2 {
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--c-dark);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 56px;
  margin-bottom: 10px;
  line-height: 1.1;
}

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

.content-article h2 + hr,
.content-article h3 + hr {
  border: none;
  border-top: 2px solid var(--c-primary);
  margin-bottom: 20px;
}

hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 24px 0;
}

.content-article h3 {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-top: 32px;
  margin-bottom: 8px;
}

.content-article p {
  margin-bottom: 1em;
  color: var(--c-text);
  font-size: 1rem;
}

.content-article ul,
.content-article ol {
  padding-left: 1.4em;
  margin-bottom: 1em;
}

.content-article li { margin-bottom: 0.4em; }

.content-article strong { color: var(--c-dark); font-weight: 700; }

.content-article em { color: var(--c-terracotta); font-style: italic; }

.content-article a {
  color: var(--c-link);
  border-bottom: 1px solid var(--c-primary);
  transition: color var(--transition-std), border-color var(--transition-std);
}
.content-article a:hover { color: var(--c-primary); border-color: var(--c-terracotta); text-decoration: none; }

/* div 区块分隔 */
.content-article div {
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--c-border);
}
.content-article div:last-child { border-bottom: none; }

/* time 标签 */
time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

/* 卡片式块（正文内如有） */
.content-article .card,
.content-article blockquote {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  background: var(--c-surface);
  padding: 20px 24px;
  margin: 24px 0;
}

/* ============================================================
   右侧侧边栏
   ============================================================ */
.content-aside {
  width: 240px;
  flex-shrink: 0;
  padding: 0 32px 56px 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.aside-block {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 20px;
}

.aside-block h3 {
  font-family: var(--font-title);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--c-dark);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.aside-block hr {
  border-top: 2px solid var(--c-primary);
  margin-bottom: 14px;
}

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

.aside-nav-list li a {
  display: flex;
  align-items: center;
  min-height: 36px;
  font-size: 0.85rem;
  color: var(--c-link);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-std), border-color var(--transition-std);
}

.aside-nav-list li a:hover {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
  text-decoration: none;
}

.aside-tip p {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  line-height: 1.55;
}

/* ============================================================
   页脚  footer 三列 dl
   ============================================================ */
.site-footer {
  background: var(--c-dark);
  color: var(--c-sand);
  margin-top: auto;
  border-top: 2px solid var(--c-primary);
}

.footer-top {
  padding: 48px 48px 32px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col dt {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--c-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(92,198,176,0.3);
}

.footer-col dd {
  font-size: 0.85rem;
  color: rgba(212,196,168,0.75);
  margin-bottom: 8px;
  line-height: 1.5;
  margin-inline-start: 0;
}

.footer-col dd a {
  color: rgba(212,196,168,0.75);
  transition: color var(--transition-std);
}
.footer-col dd a:hover { color: var(--c-primary); text-decoration: none; }

.footer-bottom {
  padding: 16px 48px;
  border-top: 1px solid rgba(92,198,176,0.15);
  font-size: 0.78rem;
  color: rgba(212,196,168,0.4);
  text-align: center;
  letter-spacing: 0.04em;
}

/* ============================================================
   Hover micro-interaction（卡片、侧边栏）
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .aside-block {
    transition: box-shadow var(--transition-std), transform var(--transition-std);
  }
  .aside-block:hover {
    box-shadow: 0 4px 20px rgba(92,198,176,0.12);
    transform: translateY(-2px);
  }
}

/* ============================================================
   响应式 — 平板（≤1100px）
   ============================================================ */
@media (max-width: 1100px) {
  :root { --sidebar-w: 200px; }

  .hero-text-layer { padding: 48px 40px 90px; }

  .wrap { padding: 0 24px 48px 32px; }

  .content-aside { width: 200px; padding-right: 24px; }
}

/* ============================================================
   响应式 — 移动端（≤768px）
   ============================================================ */
@media (max-width: 768px) {
  :root { --sidebar-w: 0px; --top-banner-h: 32px; }

  html { font-size: 16px; }

  /* 顶部公告条变为全宽 */
  .top-banner {
    left: 0;
    font-size: 0.72rem;
  }

  /* 侧边导航转为顶部横排 */
  .sidebar-nav {
    position: fixed;
    top: var(--top-banner-h);
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    max-height: calc(100vh - var(--top-banner-h));
    flex-direction: column;
    border-right: none;
    border-bottom: 2px solid var(--c-primary);
    overflow-y: auto;
    z-index: 490;
    transform: translateX(-100%);
    transition: transform 0.28s ease-out;
  }

  /* 移动端导航开关（纯 CSS checkbox trick） */
  .sidebar-nav.is-open {
    transform: translateX(0);
  }

  .brand-block { flex-direction: row; align-items: center; padding: 16px 20px; }
  .brand-name { font-size: 1.2rem; }

  .sidebar-nav nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 8px 12px 16px;
    gap: 4px;
  }

  .sidebar-nav nav ul li a {
    min-height: 40px;
    padding: 8px 14px;
    font-size: 0.82rem;
    border-left: none;
    border-bottom: 2px solid transparent;
  }
  .sidebar-nav nav ul li a:hover {
    border-left-color: transparent;
    border-bottom-color: var(--c-primary);
    background: rgba(92,198,176,0.08);
  }

  .sidebar-tagline { display: none; }

  /* 汉堡按钮 */
  .mobile-toggle {
    display: flex;
    position: fixed;
    top: calc(var(--top-banner-h) + 8px);
    right: 16px;
    z-index: 600;
    background: var(--c-dark);
    color: var(--c-primary);
    border: 1px solid var(--c-primary);
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.3rem;
    border-radius: 0;
  }

  .main-content-area {
    margin-left: 0;
    margin-top: calc(var(--top-banner-h) + 60px);
  }

  .hero-block { min-height: 55vh; }
  .hero-text-layer { padding: 36px 24px 80px; }
  .hero-h1 { font-size: 2.2rem; }
  .hero-desc { font-size: 0.95rem; }

  .page-main {
    flex-direction: column;
    padding: 32px 0 0;
  }

  .wrap { padding: 0 20px 40px; }

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

  .content-aside {
    width: 100%;
    padding: 0 20px 40px;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .aside-block { flex: 1; min-width: 240px; }

  .footer-top { padding: 36px 24px 24px; }
  .footer-cols { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { padding: 14px 24px; }

  /* div 滚动偏移（移动端） */
  div[id] { scroll-margin-top: calc(var(--top-banner-h) + 68px); }
}

/* ============================================================
   桌面端：隐藏移动端汉堡按钮
   ============================================================ */
.mobile-toggle { display: none; }

@media (max-width: 768px) {
  .mobile-toggle { display: flex; }
}

/* ============================================================
   打印
   ============================================================ */
@media print {
  .sidebar-nav, .top-banner, .content-aside, .mobile-toggle { display: none !important; }
  .main-content-area { margin: 0; }
  .wrap { padding: 0; }
}

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