@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&display=swap');

/* =====================
   CSS 变量 & 重置
   ===================== */
:root {
  --c-primary: #1A1A2E;
  --c-accent: #E94560;
  --c-light: #F5F5F5;
  --c-mid: #2D2D4E;
  --c-muted: #8888AA;
  --c-border: #2D2D4E;
  --c-card-bg: #22223A;
  --c-text: #F5F5F5;
  --c-text-dark: #1A1A2E;
  --bar-h: 60px;
  --font: 'Atkinson Hyperlegible', Arial, Helvetica, sans-serif;
  --radius: 4px;
  --radius-card: 18px;
  --transition: 160ms ease;
  --max-w: 1100px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-primary);
  color: var(--c-text);
}

body.body-root {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  background: var(--c-primary);
  color: var(--c-text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* scroll-margin 为固定底栏留空 */
section[id] {
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

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

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover, a:focus-visible {
  color: var(--c-light);
  text-decoration: underline;
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

ul {
  list-style: none;
}

/* =====================
   页面根容器
   ===================== */
.page-root {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: var(--bar-h);
}

/* =====================
   全屏遮罩菜单
   ===================== */
.overlay-menu {
  position: fixed;
  inset: 0;
  background: var(--c-primary);
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.overlay-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.overlay-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.overlay-aside {
  width: 100%;
  max-width: 480px;
  padding: 0 32px;
}

.overlay-nav ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.overlay-nav .nav-link {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-light);
  padding: 14px 0;
  border-bottom: 2px solid var(--c-border);
  transition: color var(--transition), padding-left var(--transition);
  min-height: 44px;
}

.overlay-nav .nav-link:hover,
.overlay-nav .nav-link:focus-visible {
  color: var(--c-accent);
  padding-left: 12px;
  text-decoration: none;
}

/* =====================
   Hero 区块
   ===================== */
.hero-section {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  background: var(--c-mid);
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  position: absolute;
  inset: 0;
}

.hero-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(233,69,96,0.25) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: right;
  max-width: 640px;
  padding: 48px 40px 80px 40px;
}

.hero-badge {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-light);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 4px 14px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-light);
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 1.1rem;
  line-height: 1.7;
  color: rgba(245,245,245,0.85);
  margin-bottom: 0;
}

.hero-float-tag {
  position: absolute;
  top: 40px;
  left: 40px;
  z-index: 3;
  background: var(--c-accent);
  color: var(--c-light);
  font-size: 1.2rem;
  font-weight: 700;
  padding: 8px 20px;
  border-radius: var(--radius);
  letter-spacing: 0.08em;
}

/* =====================
   主内容区
   ===================== */
.site-main {
  flex: 1;
  background: var(--c-primary);
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px 24px 48px;
}

.content-section {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.content-article {
  flex: 1 1 0;
  min-width: 0;
}

.content-body {
  color: var(--c-text);
}

/* 正文内容样式 */
.content-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-light);
  margin: 48px 0 8px;
  padding-top: 8px;
  border-left: 4px solid var(--c-accent);
  padding-left: 16px;
}

.content-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-accent);
  margin: 32px 0 8px;
}

.content-body p {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(245,245,245,0.9);
  margin-bottom: 16px;
}

.content-body ul,
.content-body ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.content-body li {
  line-height: 1.8;
  margin-bottom: 6px;
  color: rgba(245,245,245,0.85);
  list-style: disc;
}

.content-body a {
  color: var(--c-accent);
  border-bottom: 1px solid var(--c-accent);
}

.content-body a:hover {
  color: var(--c-light);
  border-color: var(--c-light);
}

.content-body section {
  margin-bottom: 40px;
}

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

.content-body blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 12px 20px;
  margin: 24px 0;
  background: var(--c-card-bg);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  color: rgba(245,245,245,0.85);
}

/* =====================
   侧边栏 aside
   ===================== */
.content-aside {
  flex: 0 0 240px;
  width: 240px;
  position: sticky;
  top: calc(var(--bar-h) + 24px);
  background: var(--c-card-bg);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  border: 1px solid var(--c-border);
}

.content-aside nav ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 24px;
}

.aside-link {
  display: block;
  color: rgba(245,245,245,0.75);
  font-size: 0.88rem;
  padding: 8px 10px;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-link:hover,
.aside-link:focus-visible {
  background: var(--c-accent);
  color: var(--c-light);
  text-decoration: none;
}

.aside-tip h2 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 6px;
  border: none;
  padding: 0;
}

.aside-tip .subtitle {
  font-size: 0.8rem;
  color: var(--c-muted);
  line-height: 1.5;
}

/* =====================
   页脚
   ===================== */
.site-footer {
  background: var(--c-mid);
  border-top: 2px solid var(--c-accent);
  padding: 48px 24px 0;
}

.footer-top {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding-bottom: 40px;
}

.footer-brand-col {
  flex: 1 1 260px;
}

.footer-logo-link {
  display: inline-block;
  margin-bottom: 16px;
}

.footer-logo {
  height: 40px;
  width: auto;
}

.footer-logo-text {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-light);
  text-decoration: none;
}

.footer-address {
  font-style: normal;
  color: rgba(245,245,245,0.7);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-address a {
  color: var(--c-accent);
}

.footer-links-col {
  flex: 1 1 200px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-light);
  margin-bottom: 6px;
}

.footer-links-col .subtitle {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-bottom: 16px;
}

.footer-links-col ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-links-col ul li a {
  color: rgba(245,245,245,0.75);
  font-size: 0.9rem;
  padding: 6px 0;
  display: block;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}

.footer-links-col ul li a:hover {
  color: var(--c-accent);
  text-decoration: none;
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  border-top: 1px solid var(--c-border);
  padding: 16px 0 24px;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--c-muted);
}

/* =====================
   底部固定导航条
   ===================== */
.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bar-h);
  background: var(--c-primary);
  border-top: 2px solid var(--c-accent);
  z-index: 800;
}

.bottom-bar nav {
  height: 100%;
}

.bottom-bar nav ul {
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
}

.bottom-bar-logo {
  flex: 0 0 auto;
}

.bottom-bar-spacer {
  flex: 1;
}

.bottom-brand-icon {
  display: flex;
  align-items: center;
  min-height: 44px;
  min-width: 44px;
}

.bottom-logo-mark {
  height: 32px;
  width: auto;
}

.bottom-bar-cta {
  flex: 0 0 auto;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent);
  color: var(--c-light);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0 20px;
  height: 40px;
  border-radius: var(--radius);
  min-height: 44px;
  transition: background var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.cta-btn:hover,
.cta-btn:focus-visible {
  background: #c73550;
  color: var(--c-light);
  text-decoration: none;
  outline: 2px solid var(--c-light);
}

.bottom-bar-menu {
  flex: 0 0 auto;
}

.hamburger-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.hamburger-btn:hover,
.hamburger-btn:focus-visible {
  background: var(--c-mid);
  outline: 2px solid var(--c-accent);
}

/* =====================
   Stagger 动画
   ===================== */
@media (prefers-reduced-motion: no-preference) {
  .overlay-nav .nav-link {
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 200ms ease, transform 200ms ease, color var(--transition), padding-left var(--transition);
  }

  .overlay-menu.is-open .overlay-nav li:nth-child(1) .nav-link { opacity: 1; transform: none; transition-delay: 60ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(2) .nav-link { opacity: 1; transform: none; transition-delay: 100ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(3) .nav-link { opacity: 1; transform: none; transition-delay: 140ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(4) .nav-link { opacity: 1; transform: none; transition-delay: 180ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(5) .nav-link { opacity: 1; transform: none; transition-delay: 220ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(6) .nav-link { opacity: 1; transform: none; transition-delay: 260ms; }
  .overlay-menu.is-open .overlay-nav li:nth-child(7) .nav-link { opacity: 1; transform: none; transition-delay: 300ms; }

  .content-body section {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 360ms ease, transform 360ms ease;
  }

  .content-body section.in-view {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .overlay-menu { transition: none; }
  .overlay-nav .nav-link { opacity: 1; transform: none; transition: none; }
  .content-body section { opacity: 1; transform: none; transition: none; }
}

/* =====================
   响应式断点
   ===================== */
@media (max-width: 768px) {
  .content-section {
    flex-direction: column;
  }

  .content-aside {
    position: static;
    width: 100%;
    flex: none;
    order: -1;
  }

  .hero-content {
    max-width: 100%;
    padding: 32px 20px 80px;
    text-align: right;
  }

  .hero-float-tag {
    top: 20px;
    left: 20px;
    font-size: 1rem;
    padding: 6px 14px;
  }

  .wrap {
    padding: 40px 16px 32px;
  }

  .footer-top {
    flex-direction: column;
    gap: 32px;
  }

  .overlay-nav .nav-link {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 1.8rem;
  }

  .hero-lead {
    font-size: 0.95rem;
  }

  .cta-btn {
    font-size: 0.82rem;
    padding: 0 14px;
  }

  .content-body h2 {
    font-size: 1.3rem;
  }
}

/* =====================
   无障碍焦点指示
   ===================== */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}