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

/* ===== 变量 ===== */
:root {
  --clr-primary: #c8e0f4;
  --clr-secondary: #f5e0e8;
  --clr-dark: #171f26;
  --clr-primary-dark: #a3c4e0;
  --clr-secondary-dark: #e0b8cc;
  --clr-primary-light: #e8f3fc;
  --clr-secondary-light: #fdf0f5;
  --clr-text: #1e2d3d;
  --clr-text-muted: #4a6178;
  --clr-surface: #d0e8f8;
  --clr-surface2: #f8e8f0;
  --shadow-neu-out:
    -5px -5px 15px rgba(255,255,255,0.75),
    5px 5px 15px rgba(150,180,210,0.45);
  --shadow-neu-in:
    inset -3px -3px 8px rgba(255,255,255,0.7),
    inset 3px 3px 8px rgba(150,180,210,0.4);
  --shadow-neu-dark:
    -5px -5px 15px rgba(255,255,255,0.08),
    5px 5px 15px rgba(0,0,0,0.45);
  --shadow-neu-dark-in:
    inset -3px -3px 8px rgba(255,255,255,0.06),
    inset 3px 3px 8px rgba(0,0,0,0.5);
  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --font-title: 'Righteous', 'Poppins', system-ui, sans-serif;
  --font-body: 'Poppins', system-ui, -apple-system, sans-serif;
  --nav-h: 52px;
  --brand-h: 72px;
  --banner-h: 36px;
  --sticky-offset: 160px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--sticky-offset);
  font-size: 17px;
  line-height: 1.6;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body.neu-body {
  font-family: var(--font-body);
  background-color: var(--clr-primary);
  color: var(--clr-text);
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ol, ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

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

/* ===== 顶部公告条 ===== */
.top-banner {
  background: linear-gradient(90deg, var(--clr-dark) 0%, #1e2f3e 100%);
  color: var(--clr-primary-light);
  text-align: center;
  padding: 0 1rem;
  height: var(--banner-h);
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 100;
}
.top-banner__text {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  opacity: 0.92;
}

/* ===== 品牌行 ===== */
.brand-bar {
  background: linear-gradient(145deg, var(--clr-primary-light), var(--clr-primary));
  box-shadow: var(--shadow-neu-out);
  position: sticky;
  top: var(--banner-h);
  z-index: 99;
}
.brand-bar__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: var(--brand-h);
}
.brand-bar__logo-link { display: flex; align-items: center; }
.brand-bar__logo-link img { height: 44px; width: auto; border-radius: var(--radius-sm); }
.brand-bar__name {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--clr-dark);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.brand-bar__tagline {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-left: auto;
  display: none;
}
@media (min-width: 640px) { .brand-bar__tagline { display: block; } }

/* ===== 主导航行 ===== */
.site-header {
  background: linear-gradient(145deg, var(--clr-primary), var(--clr-primary-dark));
  box-shadow: 0 4px 12px rgba(150,180,210,0.35);
  position: sticky;
  top: calc(var(--banner-h) + var(--brand-h));
  z-index: 98;
}
.main-nav { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }
.main-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  height: var(--nav-h);
  align-items: center;
}
.main-nav ol > li { display: flex; }
.main-nav ol > li > a {
  display: flex;
  align-items: center;
  padding: 0 1rem;
  height: var(--nav-h);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-dark);
  border-radius: var(--radius-sm);
  transition: background 0.18s, box-shadow 0.18s;
  white-space: nowrap;
  min-height: 44px;
}
.main-nav ol > li > a:hover,
.main-nav ol > li > a:focus {
  background: var(--clr-primary-light);
  box-shadow: var(--shadow-neu-in);
  outline: none;
}
.main-nav ol > li > a:active { transform: scale(0.97); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(145deg, var(--clr-dark) 0%, #1a2a38 55%, #0f1820 100%);
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* 点阵底纹 */
.hero__dotgrid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(200,224,244,0.18) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 1;
}

.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8rem 1.5rem 10rem;
  width: 100%;
}
.hero__content {
  max-width: 620px;
  text-align: left;
}
.hero__eyebrow {
  display: inline-block;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  color: var(--clr-dark);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.9rem;
  border-radius: 99px;
  margin-bottom: 1.2rem;
}
.hero__h1 {
  font-family: var(--font-title);
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: #fff;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero__sub {
  font-size: 1rem;
  color: rgba(200,224,244,0.82);
  line-height: 1.7;
  margin-bottom: 2rem;
}
.hero__cta {
  display: inline-flex;
  align-items: center;
  height: 50px;
  padding: 0 2rem;
  background: linear-gradient(145deg, var(--clr-secondary), var(--clr-secondary-dark));
  color: var(--clr-dark);
  font-family: var(--font-title);
  font-size: 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-neu-out);
  transition: transform 0.15s, box-shadow 0.15s;
}
.hero__cta:hover { transform: translateY(-2px); box-shadow: -6px -6px 18px rgba(255,255,255,0.7), 6px 6px 18px rgba(150,180,210,0.55); }
.hero__cta:active { transform: scale(0.97); box-shadow: var(--shadow-neu-in); }

/* 圆弧底边 */
.hero__arc {
  position: absolute;
  bottom: -2px;
  left: 0; right: 0;
  height: 80px;
  background: var(--clr-primary);
  clip-path: ellipse(55% 100% at 50% 100%);
  z-index: 3;
}

/* ===== 主内容区 ===== */
.site-main { flex: 1; padding: 3rem 0 4rem; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

.content-with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: start;
}
@media (max-width: 900px) {
  .content-with-aside { grid-template-columns: 1fr; }
  .site-aside { order: -1; }
}

.main-section { width: 100%; }
.main-article { width: 100%; }

/* page.content 内部样式 */
.main-article section {
  background: linear-gradient(145deg, var(--clr-primary-light), var(--clr-primary));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-neu-out);
  padding: 2rem 2rem 2.5rem;
  margin-bottom: 2.5rem;
  scroll-margin-top: var(--sticky-offset);
  transition: box-shadow 0.3s;
}
.main-article section:hover { box-shadow: -6px -6px 20px rgba(255,255,255,0.8), 6px 6px 20px rgba(150,180,210,0.5); }

.main-article h2 {
  font-family: var(--font-title);
  font-size: 1.45rem;
  color: var(--clr-dark);
  margin-bottom: 0.6rem;
  letter-spacing: 0.02em;
}
.main-article h2 + hr,
.main-article h3 + hr {
  border: none;
  border-top: 2px solid var(--clr-primary-dark);
  margin: 0.5rem 0 1.2rem;
  border-radius: 2px;
}
.main-article hr {
  border: none;
  border-top: 1px solid rgba(163,196,224,0.5);
  margin: 1.2rem 0;
}
.main-article h3 {
  font-family: var(--font-title);
  font-size: 1.15rem;
  color: var(--clr-dark);
  margin: 1.4rem 0 0.5rem;
}
.main-article p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--clr-text);
  margin-bottom: 1rem;
}
.main-article a {
  color: #2d6fa0;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.main-article a:hover { color: #1a4e72; }
.main-article ul, .main-article ol {
  padding-left: 1.4rem;
  margin-bottom: 1rem;
  list-style: disc;
}
.main-article ol { list-style: decimal; }
.main-article li { margin-bottom: 0.4rem; line-height: 1.7; }
.main-article strong { font-weight: 600; color: var(--clr-dark); }
.main-article em { color: var(--clr-text-muted); font-style: italic; }
.main-article blockquote {
  border-left: 4px solid var(--clr-primary-dark);
  padding: 0.8rem 1.2rem;
  margin: 1.2rem 0;
  background: var(--clr-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--clr-text-muted);
}

/* 卡片：玻璃拟态 圆角0 */
.main-article .card,
.card {
  background: rgba(200,224,244,0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 0;
  box-shadow: 0 4px 20px rgba(150,180,210,0.3);
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(150,180,210,0.45); }

/* ===== 侧边栏 ===== */
.site-aside {
  position: sticky;
  top: calc(var(--banner-h) + var(--brand-h) + var(--nav-h) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.aside-card {
  background: linear-gradient(145deg, var(--clr-secondary-light), var(--clr-secondary));
  border-radius: var(--radius);
  box-shadow: var(--shadow-neu-out);
  padding: 1.4rem;
}
.aside-card--tip {
  background: linear-gradient(145deg, var(--clr-primary-light), #ddeefa);
}
.aside-card__title {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--clr-dark);
  margin-bottom: 0.5rem;
}
.aside-card hr {
  border: none;
  border-top: 2px solid var(--clr-secondary-dark);
  margin: 0.4rem 0 1rem;
}
.aside-nav-list { list-style: none; padding: 0; }
.aside-nav-list li { margin-bottom: 0.4rem; }
.aside-nav-list li a {
  display: block;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--clr-text);
  transition: background 0.15s, box-shadow 0.15s;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.aside-nav-list li a:hover {
  background: var(--clr-secondary-light);
  box-shadow: var(--shadow-neu-in);
}
.aside-tip-text {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
}

/* ===== 页脚 ===== */
.site-footer {
  background: linear-gradient(145deg, var(--clr-dark), #0f1820);
  color: var(--clr-primary-light);
  margin-top: auto;
}
.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2.5rem;
}
@media (max-width: 768px) {
  .footer-top { grid-template-columns: 1fr; gap: 2rem; }
}
.footer-brand-big {
  font-family: var(--font-title);
  font-size: clamp(1.8rem, 4vw, 3rem);
  display: block;
  margin-bottom: 0.8rem;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand-desc {
  font-size: 0.85rem;
  color: rgba(200,224,244,0.65);
  line-height: 1.6;
}
.footer-col-title {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--clr-secondary);
  margin-bottom: 0.8rem;
}
.footer-col-text {
  font-size: 0.85rem;
  color: rgba(200,224,244,0.65);
  line-height: 1.65;
}
.footer-nav ol { list-style: none; padding: 0; }
.footer-nav ol li { margin-bottom: 0.4rem; }
.footer-nav ol li a {
  font-size: 0.88rem;
  color: rgba(200,224,244,0.75);
  transition: color 0.15s;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.1rem 0;
}
.footer-nav ol li a:hover { color: var(--clr-secondary); }

.footer-bottom {
  border-top: 1px solid rgba(200,224,244,0.12);
}
.footer-bottom__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
  align-items: center;
  text-align: center;
}
.footer-copyright {
  font-size: 0.82rem;
  color: rgba(200,224,244,0.5);
}
.footer-note {
  font-size: 0.82rem;
  color: rgba(200,224,244,0.4);
}

/* ===== 视差动效（JS配合）===== */
.hero__dotgrid { will-change: transform; }

/* ===== 移动端 ===== */
@media (max-width: 600px) {
  :root {
    --sticky-offset: 140px;
  }
  .main-nav ol {
    height: auto;
    padding: 0.4rem 0;
  }
  .main-nav ol > li > a {
    padding: 0 0.6rem;
    font-size: 0.8rem;
    height: 44px;
  }
  .brand-bar__inner { padding: 0.5rem 1rem; height: auto; min-height: var(--brand-h); }
  .brand-bar__name { font-size: 1.2rem; }
  .hero__inner { padding: 6rem 1rem 7rem; }
  .main-article section { padding: 1.4rem 1.2rem 1.8rem; }
  .aside-card { padding: 1rem; }
  .wrap { padding: 0 1rem; }
}

/* ===== Stagger动效 ===== */
.main-article section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease, box-shadow 0.3s;
}
.main-article section.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .main-article section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}