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

/* ===== CSS变量 ===== */
:root {
  --c-dark: #1a1a2e;
  --c-gold: #e8a838;
  --c-cream: #f5f0e8;
  --c-dark-80: rgba(26,26,46,0.85);
  --c-gold-20: rgba(232,168,56,0.2);
  --c-gold-40: rgba(232,168,56,0.4);
  --c-cream-10: rgba(245,240,232,0.1);
  --c-cream-20: rgba(245,240,232,0.2);
  --c-glass-bg: rgba(26,26,46,0.6);
  --c-glass-border: rgba(232,168,56,0.3);
  --c-text: #f5f0e8;
  --c-text-muted: rgba(245,240,232,0.65);
  --c-text-dark: #1a1a2e;
  --radius-card: 28px;
  --radius-sm: 8px;
  --header-h: 72px;
  --anchor-h: 44px;
  --total-header: calc(var(--header-h) + var(--anchor-h));
  --font-serif: 'Noto Serif JP', 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', system-ui, sans-serif;
  --transition: 0.35s cubic-bezier(0.4,0,0.2,1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--total-header);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--c-dark);
  color: var(--c-text);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-gold); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-cream); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

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

/* ===== 顶部导航 ===== */
.top-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-dark-80);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-glass-border);
  will-change: transform;
}

.header-inner { max-width: 1400px; margin: 0 auto; padding: 0 24px; }

.main-nav {
  display: flex;
  align-items: center;
  height: var(--header-h);
  gap: 0;
  position: relative;
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-right { justify-content: flex-end; }

.nav-brand {
  flex-shrink: 0;
  padding: 0 20px;
  display: flex;
  align-items: center;
}

.brand-logo { display: flex; align-items: center; }
.brand-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.brand-text:hover { color: var(--c-cream); }

.nav-link {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--c-text-muted);
  padding: 10px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.nav-link:hover { color: var(--c-gold); background: var(--c-gold-20); }

.nav-search {
  display: flex;
  align-items: center;
  margin-left: 12px;
}

.search-form { display: flex; align-items: center; gap: 0; }

.search-input {
  background: var(--c-cream-10);
  border: 1px solid var(--c-glass-border);
  border-radius: 20px 0 0 20px;
  padding: 8px 14px;
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  outline: none;
  width: 140px;
  transition: border-color var(--transition), width var(--transition);
  min-height: 40px;
}
.search-input:focus { border-color: var(--c-gold); width: 180px; }
.search-input::placeholder { color: var(--c-text-muted); }

.search-btn {
  background: var(--c-gold);
  border: 1px solid var(--c-gold);
  border-radius: 0 20px 20px 0;
  padding: 8px 12px;
  color: var(--c-dark);
  font-size: 0.9rem;
  min-height: 40px;
  transition: background var(--transition);
}
.search-btn:hover { background: var(--c-cream); }

/* 锚点条 */
.anchor-bar {
  background: rgba(26,26,46,0.95);
  border-top: 1px solid var(--c-glass-border);
  border-bottom: 1px solid rgba(232,168,56,0.15);
  overflow-x: auto;
  scrollbar-width: none;
}
.anchor-bar::-webkit-scrollbar { display: none; }

.anchor-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 0;
  height: var(--anchor-h);
}

.anchor-link {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--c-text-muted);
  padding: 10px 14px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.anchor-link:hover { color: var(--c-gold); border-bottom-color: var(--c-gold); }

/* ===== Hero Section ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  overflow: hidden;
  padding: 120px 48px 80px;
}

.hero-bg-layer {
  position: absolute;
  inset: 0;
  will-change: transform;
}

.hero-bg-1 {
  background: linear-gradient(135deg, #0d0d1e 0%, #1a1a2e 60%, #16213e 100%);
  z-index: 0;
}

.hero-bg-2 {
  background: radial-gradient(ellipse at 20% 50%, rgba(232,168,56,0.12) 0%, transparent 60%);
  z-index: 1;
  animation: pulse-glow 8s ease-in-out infinite alternate;
}

.hero-bg-3 {
  background: radial-gradient(ellipse at 80% 20%, rgba(232,168,56,0.06) 0%, transparent 50%);
  z-index: 1;
}

@keyframes pulse-glow {
  from { opacity: 0.6; }
  to { opacity: 1; }
}

.hero-slash {
  position: absolute;
  top: -10%;
  left: 35%;
  width: 45%;
  height: 130%;
  background: linear-gradient(170deg, var(--c-gold) 0%, rgba(232,168,56,0.15) 40%, transparent 70%);
  clip-path: polygon(20% 0%, 100% 0%, 80% 100%, 0% 100%);
  z-index: 2;
  opacity: 0.12;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 680px;
  text-align: right;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 20px;
  font-family: var(--font-sans);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-cream);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--c-text-muted);
  margin-bottom: 36px;
  max-width: 500px;
  margin-left: auto;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--c-gold);
  color: var(--c-dark);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 14px 32px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 48px;
}
.hero-cta:hover {
  background: var(--c-cream);
  color: var(--c-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(232,168,56,0.4);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--c-text-muted);
}

.scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--c-gold), transparent);
  animation: line-drop 2s ease-in-out infinite;
}
@keyframes line-drop {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

.scroll-text {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--c-text-muted);
  writing-mode: vertical-rl;
  display: none;
}

/* ===== 正文主体 ===== */
.site-main {
  flex: 1;
  background: var(--c-dark);
}

.content-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 24px 100px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 60px;
  align-items: start;
}

/* ===== Aside（左侧） ===== */
.content-aside {
  position: sticky;
  top: calc(var(--total-header) + 24px);
}

.aside-inner {
  background: var(--c-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-card);
  padding: 32px 24px;
}

.aside-heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-gold);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.aside-inner hr {
  border: none;
  border-top: 1px solid var(--c-glass-border);
  margin-bottom: 16px;
}

.aside-desc {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--c-text-muted);
  margin-bottom: 20px;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-nav-link {
  display: block;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.aside-nav-link:hover { color: var(--c-gold); background: var(--c-gold-20); }

/* ===== Figure 装饰 ===== */
.content-figure {
  margin: 0 0 40px;
}

.figure-deco {
  display: flex;
  align-items: center;
  gap: 16px;
}

.figure-num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-gold);
  opacity: 0.4;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.figure-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--c-gold-40), transparent);
}

.figure-deco--end { flex-direction: row-reverse; }
.figure-deco--end .figure-line {
  background: linear-gradient(to left, var(--c-gold-40), transparent);
}

.figure-label {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--c-text-muted);
}

.content-figure--outro { margin: 40px 0 0; }

/* ===== 正文内容区 ===== */
.page-content {
  color: var(--c-text);
}

/* page.content 内部 div 样式 */
.page-content div {
  scroll-margin-top: calc(var(--total-header) + 20px);
  padding: 60px 0;
  border-bottom: 1px solid rgba(232,168,56,0.1);
  position: relative;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-content div.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.page-content div:last-child { border-bottom: none; }

.page-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 700;
  color: var(--c-cream);
  margin-bottom: 16px;
  line-height: 1.3;
}

.page-content h2 + hr {
  border: none;
  border-top: 2px solid var(--c-gold);
  width: 60px;
  margin: 0 0 28px;
}

.page-content h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-gold);
  margin: 28px 0 12px;
}

.page-content h3 + hr {
  border: none;
  border-top: 1px solid var(--c-gold-40);
  width: 40px;
  margin: 0 0 16px;
}

.page-content p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-text-muted);
  margin-bottom: 18px;
}

.page-content strong { color: var(--c-cream); font-weight: 600; }
.page-content em { color: var(--c-gold); font-style: italic; }

.page-content ul, .page-content ol {
  margin: 16px 0 20px 20px;
  list-style: disc;
  color: var(--c-text-muted);
}
.page-content ol { list-style: decimal; }
.page-content li {
  margin-bottom: 8px;
  font-size: 1rem;
  line-height: 1.75;
  padding-left: 8px;
}

.page-content a {
  color: var(--c-gold);
  border-bottom: 1px solid var(--c-gold-40);
  transition: border-color var(--transition), color var(--transition);
}
.page-content a:hover { color: var(--c-cream); border-bottom-color: var(--c-cream); }

.page-content blockquote {
  border-left: 3px solid var(--c-gold);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--c-glass-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--c-text-muted);
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}
.page-content th {
  background: var(--c-gold-20);
  color: var(--c-gold);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--c-glass-border);
}
.page-content td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(245,240,232,0.08);
  color: var(--c-text-muted);
}
.page-content tr:hover td { background: var(--c-cream-10); }

.page-content code {
  background: rgba(232,168,56,0.12);
  color: var(--c-gold);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

.page-content pre {
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
}
.page-content pre code { background: none; padding: 0; }

/* ===== 页脚（极简：仅 p + small；另有 nav > dl） ===== */
.site-footer {
  background: #0d0d1e;
  border-top: 1px solid var(--c-glass-border);
  padding: 60px 24px 40px;
  text-align: center;
}

.footer-nav {
  margin-bottom: 40px;
}

.footer-dl {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 4px 0;
  max-width: 900px;
  margin: 0 auto;
}

.footer-dt {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--c-gold);
  font-weight: 700;
  width: 100%;
  margin-bottom: 12px;
  font-family: var(--font-sans);
}

.footer-dd { margin: 0; }

.footer-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  transition: color var(--transition);
  min-height: 40px;
  border-right: 1px solid rgba(245,240,232,0.1);
}
.footer-dd:last-child .footer-link { border-right: none; }
.footer-link:hover { color: var(--c-gold); }

.footer-copy {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.footer-small {
  display: block;
  font-size: 0.75rem;
  color: rgba(245,240,232,0.35);
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Scroll Reveal 动画 ===== */
@media (prefers-reduced-motion: no-preference) {
  .sr-item {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .sr-item.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
  .sr-stagger .sr-item:nth-child(1) { transition-delay: 0s; }
  .sr-stagger .sr-item:nth-child(2) { transition-delay: 0.08s; }
  .sr-stagger .sr-item:nth-child(3) { transition-delay: 0.16s; }
  .sr-stagger .sr-item:nth-child(4) { transition-delay: 0.24s; }
  .sr-stagger .sr-item:nth-child(5) { transition-delay: 0.32s; }
  .sr-stagger .sr-item:nth-child(6) { transition-delay: 0.4s; }
}

@media (prefers-reduced-motion: reduce) {
  .page-content div {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .sr-item {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .scroll-line { animation: none; }
  .hero-bg-2 { animation: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  .content-section {
    grid-template-columns: 220px 1fr;
    gap: 40px;
  }
}

@media (max-width: 860px) {
  .content-section {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .content-aside {
    position: static;
    margin-bottom: 40px;
  }
  .aside-inner {
    border-radius: var(--radius-sm);
    padding: 20px;
  }

  .main-nav {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0;
    gap: 8px;
  }
  .nav-left, .nav-right {
    flex: none;
    flex-wrap: wrap;
    gap: 2px;
  }
  .nav-brand { order: -1; width: 100%; justify-content: center; padding: 4px 0 0; }
  .nav-search { width: 100%; }
  .search-input { width: 100%; flex: 1; }
  .nav-link { font-size: 0.78rem; padding: 8px 8px; }

  .anchor-inner { gap: 0; }
  .anchor-link { padding: 10px 10px; font-size: 0.74rem; }

  .hero-section { padding: 100px 24px 80px; align-items: flex-end; justify-content: center; }
  .hero-content { text-align: center; max-width: 100%; }
  .hero-subtitle { margin-left: 0; }
  .hero-slash { left: 50%; width: 80%; opacity: 0.08; }
}

@media (max-width: 600px) {
  :root { --header-h: auto; }

  .header-inner { padding: 0 16px; }
  .main-nav { gap: 6px; padding: 12px 0; }
  .nav-left, .nav-right { gap: 0; }
  .nav-link { padding: 8px 6px; font-size: 0.72rem; }

  .anchor-link { font-size: 0.7rem; padding: 10px 8px; }

  .hero-title { font-size: 1.9rem; }
  .hero-subtitle { font-size: 0.92rem; }

  .content-section { padding: 48px 16px 60px; }

  .page-content div { padding: 40px 0; }
  .page-content h2 { font-size: 1.3rem; }

  .footer-link { padding: 10px 10px; font-size: 0.78rem; }

  .site-footer { padding: 40px 16px 32px; }
}

/* 防横向滚动 */
@media (max-width: 375px) {
  body { overflow-x: hidden; }
  .hero-section { padding: 80px 16px 60px; }
  .hero-title { font-size: 1.6rem; }
  .search-input { width: 110px; }
  .search-input:focus { width: 130px; }
}

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