@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

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

:root {
  --c-bg: #000000;
  --c-surface: #121212;
  --c-surface2: #1a1a1a;
  --c-border: #2a2a2a;
  --c-text: #e0e0e0;
  --c-text-muted: #888888;
  --c-text-dim: #555555;
  --c-accent-blue: #4a7fa5;
  --c-accent-gold: #c9a84c;
  --c-accent-glow: #6ea8d0;
  --c-cta: #4a7fa5;
  --c-cta-hover: #5a90b8;
  --font-serif: 'EB Garamond', 'Crimson Text', Georgia, 'Times New Roman', serif;
  --font-sans: system-ui, -apple-system, sans-serif;
  --header-h: 64px;
  --anchor-h: 40px;
  --radius: 0px;
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  font-size: 17px;
  line-height: 1.65;
}

body.oled-dark {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-serif);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a:hover, a:focus-visible {
  color: var(--c-accent-glow);
  text-shadow: 0 0 10px rgba(110, 168, 208, 0.5);
}

a:focus-visible {
  outline: 2px solid var(--c-accent-blue);
  outline-offset: 3px;
}

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

/* ===== OVERLAY MENU ===== */
.overlay-menu {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.97);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

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

.overlay-close {
  position: absolute;
  top: 24px;
  right: 28px;
  background: none;
  border: 1px solid var(--c-border);
  color: var(--c-text);
  font-size: 1.4rem;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), color var(--transition);
}

.overlay-close:hover {
  border-color: var(--c-accent-blue);
  color: var(--c-accent-blue);
}

.overlay-nav menu,
.overlay-nav ul {
  list-style: none;
  text-align: center;
}

.overlay-nav menu li {
  margin: 0.6rem 0;
}

.overlay-link {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 600;
  color: var(--c-text);
  letter-spacing: 0.05em;
  display: inline-block;
  padding: 0.4rem 1.2rem;
  transition: color var(--transition), text-shadow var(--transition);
}

.overlay-link:hover, .overlay-link:focus-visible {
  color: var(--c-accent-gold);
  text-shadow: 0 0 10px rgba(201, 168, 76, 0.6);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(0,0,0,0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
  z-index: 500;
}

.nav-details {
  display: none;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 1.5rem;
}

.header-brand {
  flex: 0 0 auto;
  margin: 0 auto;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-text);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-link:hover {
  color: var(--c-accent-gold);
  text-shadow: 0 0 10px rgba(201,168,76,0.5);
}

.logo-img, .logo-mark {
  height: 36px;
  width: auto;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

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

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

.top-nav-link {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
  padding: 0.5rem 0.3rem;
  white-space: nowrap;
  transition: color var(--transition);
}

.top-nav-link:hover {
  color: var(--c-text);
  text-shadow: none;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-cta);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--c-cta);
  cursor: pointer;
  min-height: 40px;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.cta-btn:hover, .cta-btn:focus-visible {
  background: var(--c-cta-hover);
  border-color: var(--c-cta-hover);
  box-shadow: 0 0 12px rgba(74,127,165,0.5);
  color: #fff;
  text-shadow: none;
}

.hamburger-trigger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.6rem;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
}

.bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== STICKY ANCHOR BAR ===== */
.sticky-anchor-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 400;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  overflow-x: auto;
  scrollbar-width: none;
}

.sticky-anchor-bar::-webkit-scrollbar {
  display: none;
}

.anchor-nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

.anchor-nav menu {
  display: flex;
  list-style: none;
  gap: 0;
  white-space: nowrap;
}

.anchor-link {
  display: inline-flex;
  align-items: center;
  height: var(--anchor-h);
  padding: 0 1rem;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  letter-spacing: 0.04em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.anchor-link:hover, .anchor-link:focus-visible {
  color: var(--c-accent-gold);
  border-bottom-color: var(--c-accent-gold);
  text-shadow: none;
}

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(180deg, #0a0a14 0%, #000000 100%);
  padding: calc(var(--header-h) + var(--anchor-h) + 2rem) 1.5rem 3rem;
}

.hero-bg-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: clamp(8rem, 25vw, 18rem);
  font-weight: 800;
  color: rgba(74,127,165,0.04);
  user-select: none;
  pointer-events: none;
  letter-spacing: -0.05em;
}

.hero-inner {
  position: relative;
  text-align: center;
  max-width: 720px;
  z-index: 1;
}

.hero-icon {
  font-size: 2.5rem;
  color: var(--c-accent-gold);
  text-shadow: 0 0 10px rgba(201,168,76,0.6);
  margin-bottom: 1rem;
  display: block;
  animation: iconPulse 3s ease-in-out infinite;
}

@keyframes iconPulse {
  0%, 100% { text-shadow: 0 0 10px rgba(201,168,76,0.6); }
  50% { text-shadow: 0 0 20px rgba(201,168,76,0.9), 0 0 40px rgba(201,168,76,0.3); }
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.hero-sub {
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: 1.8rem;
}

.hero-cta-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-hero {
  font-size: 1rem;
  padding: 0.75rem 2rem;
  min-height: 48px;
}

/* ===== MAIN LAYOUT ===== */
.site-main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.content-section {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  padding-top: 3rem;
}

/* aside 在内容左侧 */
.content-aside {
  flex: 0 0 220px;
  position: sticky;
  top: calc(var(--header-h) + var(--anchor-h) + 1.5rem);
  order: -1;
}

.aside-inner {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: 1.5rem 1.2rem;
}

.aside-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-accent-gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.aside-nav-list {
  list-style: none;
}

.aside-nav-list li {
  border-bottom: 1px solid var(--c-border);
}

.aside-link {
  display: block;
  padding: 0.55rem 0;
  font-size: 0.88rem;
  color: var(--c-text-muted);
  transition: color var(--transition), padding-left var(--transition);
}

.aside-link:hover, .aside-link:focus-visible {
  color: var(--c-accent-gold);
  padding-left: 0.5rem;
  text-shadow: none;
}

.aside-divider {
  height: 1px;
  background: var(--c-border);
  margin: 1.2rem 0;
}

.aside-tip {
  font-size: 0.78rem;
  color: var(--c-text-dim);
  line-height: 1.5;
}

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

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

/* ===== CONTENT STYLES ===== */
.content-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  color: #fff;
  margin: 2.5rem 0 0.4rem;
  letter-spacing: 0.02em;
  border-left: 3px solid var(--c-accent-blue);
  padding-left: 0.9rem;
}

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

.content-body .subtitle,
.content-body .subhead,
.content-body .desc,
.content-body .lead {
  font-size: 1rem;
  color: var(--c-text-muted);
  margin-bottom: 1.2rem;
  font-style: italic;
}

.content-body p {
  margin-bottom: 1.1rem;
  line-height: 1.75;
  font-size: 1rem;
}

.content-body h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-text);
  margin: 1.8rem 0 0.5rem;
}

.content-body h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-accent-gold);
  margin: 1.5rem 0 0.4rem;
  letter-spacing: 0.04em;
}

.content-body ul, .content-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

.content-body li {
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.content-body strong {
  color: #fff;
  font-weight: 600;
}

.content-body em {
  color: var(--c-accent-gold);
  font-style: italic;
}

.content-body blockquote {
  border-left: 2px solid var(--c-accent-blue);
  padding: 0.8rem 1.2rem;
  margin: 1.5rem 0;
  background: var(--c-surface);
  color: var(--c-text-muted);
  font-style: italic;
}

.content-body a {
  color: var(--c-accent-blue);
  border-bottom: 1px solid rgba(74,127,165,0.3);
}

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

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.content-body th {
  background: var(--c-surface);
  color: var(--c-accent-gold);
  padding: 0.6rem 0.8rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--c-border);
}

.content-body td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
}

.content-body tr:hover td {
  background: var(--c-surface);
}

/* Section separators from page.content */
.content-body section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--c-border);
  scroll-margin-top: calc(var(--header-h) + var(--anchor-h) + 1rem);
}

.content-body section:last-child {
  border-bottom: none;
}

/* Scroll margin for anchor targets */
section[id] {
  scroll-margin-top: calc(var(--header-h) + var(--anchor-h) + 1rem);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 1.2rem 1.5rem;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-logo a {
  color: var(--c-text-muted);
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  transition: color var(--transition);
}

.footer-logo a:hover {
  color: var(--c-accent-gold);
  text-shadow: none;
}

.footer-nav {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  flex: 1;
}

.footer-link {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  padding: 0.4rem 0.2rem;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--c-text-muted);
  text-shadow: none;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--c-text-dim);
  text-align: right;
  flex-shrink: 0;
}

/* ===== PARALLAX / ANIMATIONS ===== */
@media (prefers-reduced-motion: no-preference) {
  .content-section {
    animation: fadeInUp 0.6s ease both;
  }

  @keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .content-body section {
    transition: opacity 0.3s ease;
  }

  .hero-inner {
    animation: fadeInUp 0.8s ease both;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .header-nav-left,
  .header-nav-right {
    display: none;
  }

  .header-brand {
    margin: 0;
    flex: 1;
  }

  .hamburger-trigger {
    display: flex;
  }

  .content-section {
    flex-direction: column;
    gap: 2rem;
  }

  .content-aside {
    flex: none;
    width: 100%;
    position: static;
    order: 0;
  }

  .aside-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-start;
  }

  .aside-nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .aside-nav-list li {
    border-bottom: none;
  }

  .aside-link {
    padding: 0.3rem 0.6rem;
    background: var(--c-surface2);
    font-size: 0.82rem;
  }

  .aside-link:hover {
    padding-left: 0.6rem;
  }

  .anchor-link {
    padding: 0 0.7rem;
    font-size: 0.78rem;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .hero-section {
    min-height: 45vh;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .site-main {
    padding: 0 1rem 3rem;
  }

  .content-body h2 {
    font-size: 1.25rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }

  .footer-copy {
    text-align: left;
  }

  .footer-nav {
    gap: 0.5rem;
  }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--c-border);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-accent-blue);
}

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