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

/* ===== CSS 变量 ===== */
:root {
  --c-dark: #1A2F23;
  --c-accent: #F5A623;
  --c-white: #FFFFFF;
  --c-dark-80: rgba(26,47,35,0.85);
  --c-accent-light: #fdb94a;
  --c-accent-muted: rgba(245,166,35,0.12);
  --c-bg: #f7f6f2;
  --c-bg2: #edecea;
  --c-text: #1A2F23;
  --c-text-muted: #4a6358;
  --c-border: #d4d0c8;
  --c-card-bg: rgba(255,255,255,0.72);
  --nav-h: 56px;
  --brand-h: 60px;
  --header-h: calc(var(--brand-h) + var(--nav-h));
  --radius-card: 18px;
  --radius-sm: 4px;
  --font: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --transition: 160ms ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
input, button { font-family: inherit; }

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-dark);
  border-bottom: 3px solid var(--c-accent);
}

.brand-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--brand-h);
  padding: 0 24px;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo-img { width: 36px; height: 36px; object-fit: contain; }
.brand-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.header-search {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(255,255,255,0.08);
  border: 1.5px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex: 0 1 280px;
}
.search-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--c-white);
  font-size: 0.9rem;
  padding: 8px 12px;
  width: 100%;
  min-width: 0;
}
.search-input::placeholder { color: rgba(255,255,255,0.45); }
.search-btn {
  background: var(--c-accent);
  border: none;
  cursor: pointer;
  color: var(--c-dark);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  transition: background var(--transition);
}
.search-btn:hover { background: var(--c-accent-light); }

/* NAV ROW */
.main-nav {
  background: var(--c-dark);
  border-top: 1px solid rgba(255,255,255,0.08);
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
}
.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  padding: 0 16px;
  width: 100%;
}
.nav-links a {
  color: rgba(255,255,255,0.82);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a:focus {
  color: var(--c-accent);
  background: rgba(245,166,35,0.1);
}

/* ===== HERO ===== */
.hero-wrap {
  position: relative;
  background: var(--c-dark);
  min-height: 45vh;
  overflow: hidden;
}
.hero-inner {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 56px 24px 80px;
}
.hero-inner.has-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--c-dark-80);
  z-index: 1;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 680px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--c-accent);
  color: var(--c-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
}
.hero-h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 1rem;
  color: rgba(255,255,255,0.72);
  margin-bottom: 28px;
  line-height: 1.6;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  background: var(--c-accent);
  color: var(--c-dark);
  font-weight: 700;
  font-size: 1rem;
  padding: 13px 32px;
  border-radius: var(--radius-sm);
  min-height: 48px;
  transition: background var(--transition);
}
.hero-cta:hover { background: var(--c-accent-light); }

/* Hero clip bottom */
.hero-clip {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--c-bg);
  clip-path: ellipse(55% 100% at 50% 100%);
  z-index: 3;
}

/* ===== MAIN LAYOUT ===== */
.site-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.content-with-aside {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  align-items: start;
}

/* ===== FIGURE / aside in div ===== */
.content-primary {
  min-width: 0;
}
.content-figure {
  background: var(--c-dark);
  border-radius: var(--radius-card);
  padding: 28px 20px;
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fig-icon-row {
  display: flex;
  gap: 20px;
  font-size: 2.25rem;
}
.fig-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--c-accent-muted);
  border-radius: var(--radius-sm);
  font-size: 2rem;
  border: 2px solid var(--c-accent);
}

/* ===== PAGE CONTENT BODY ===== */
.page-content-body {
  color: var(--c-text);
}

/* Content sections from page.content */
.page-content-body div {
  margin-bottom: 56px;
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.page-content-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--c-accent);
  line-height: 1.3;
}
.page-content-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--c-dark);
  margin: 20px 0 10px;
}
.page-content-body p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 14px;
  color: var(--c-text);
}
.page-content-body ul,
.page-content-body ol {
  padding-left: 1.4em;
  margin-bottom: 14px;
}
.page-content-body li {
  margin-bottom: 6px;
  line-height: 1.7;
}
.page-content-body a {
  color: var(--c-dark);
  border-bottom: 2px solid var(--c-accent);
  transition: color var(--transition), border-color var(--transition);
}
.page-content-body a:hover {
  color: var(--c-accent);
  border-color: var(--c-accent-light);
}
.page-content-body blockquote {
  border-left: 4px solid var(--c-accent);
  margin: 20px 0;
  padding: 12px 20px;
  background: var(--c-accent-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: normal;
  color: var(--c-dark);
}
.page-content-body strong { font-weight: 700; }
.page-content-body img {
  border-radius: var(--radius-sm);
  max-width: 100%;
  margin: 16px 0;
}

/* Section ids scroll offset */
div[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ===== ASIDE ===== */
.content-aside {
  min-width: 0;
}
.aside-sticky {
  position: sticky;
  top: calc(var(--header-h) + 20px);
  background: var(--c-card-bg);
  border: 2px solid var(--c-accent);
  border-radius: var(--radius-card);
  padding: 24px 20px;
}
.aside-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}
.aside-title span { display: inline; }
.aside-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--c-text-muted);
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
}
.aside-nav-link::before {
  content: '▶';
  font-size: 0.55rem;
  color: var(--c-accent);
  flex-shrink: 0;
}
.aside-nav-link:hover {
  background: var(--c-accent-muted);
  color: var(--c-dark);
}
.aside-divider {
  height: 2px;
  background: var(--c-accent);
  margin: 18px 0;
  border-radius: 2px;
}
.aside-tip {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--c-dark);
  border-radius: var(--radius-sm);
  padding: 12px;
}
.aside-tip-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.aside-tip-text {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
  margin: 0;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--c-dark);
  border-top: 3px solid var(--c-accent);
  text-align: center;
  padding: 0;
}
.footer-cta-block {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--c-accent);
  padding: 28px 24px;
  min-height: 80px;
}
.footer-cta-icon { font-size: 2rem; }
.footer-cta-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-dark);
  letter-spacing: -0.01em;
}
.footer-copy {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  padding: 18px 24px 6px;
}
.footer-disclaimer {
  display: block;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.4);
  padding: 0 24px 20px;
  line-height: 1.5;
}

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 320ms ease, transform 320ms ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* ===== PARALLAX ===== */
.hero-bg-img {
  will-change: transform;
}
@media (prefers-reduced-motion: no-preference) {
  .hero-wrap { perspective: 1px; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .content-with-aside {
    grid-template-columns: 1fr;
  }
  .content-aside {
    order: -1;
  }
  .aside-sticky {
    position: static;
  }
  .aside-nav-link {
    display: inline-flex;
    margin-right: 4px;
    margin-bottom: 4px;
  }
  nav[aria-label="页内快速跳转"] {
    display: flex;
    flex-wrap: wrap;
  }
}

@media (max-width: 600px) {
  .brand-bar { padding: 0 16px; }
  .header-search { flex: 0 1 160px; }
  .search-input { font-size: 0.82rem; padding: 8px 8px; }
  .nav-links { padding: 0 8px; gap: 0; }
  .nav-links a { font-size: 0.8rem; padding: 10px 8px; min-height: 44px; }
  .hero-h1 { font-size: 1.6rem; }
  .hero-sub { font-size: 0.92rem; }
  .hero-cta { padding: 12px 24px; font-size: 0.95rem; }
  .site-main { padding: 32px 16px 48px; }
  .fig-icon-row { gap: 10px; }
  .fig-icon { width: 44px; height: 44px; font-size: 1.6rem; }
  .footer-cta-block { padding: 22px 16px; gap: 10px; }
  .footer-cta-text { font-size: 1rem; }
}

@media (max-width: 375px) {
  .brand-name { font-size: 1.15rem; }
  .hero-inner { padding: 40px 12px 72px; }
}