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

/* ── 自定义属性 ── */
:root {
  --c-bg: #1A1A2E;
  --c-gold: #C9A84C;
  --c-white: #F5F5F0;
  --c-bg2: #12121f;
  --c-bg3: #22223a;
  --c-glass: rgba(255,255,255,0.05);
  --c-glass-border: rgba(201,168,76,0.25);
  --c-gold-dim: rgba(201,168,76,0.15);
  --c-text: #F5F5F0;
  --c-text-muted: rgba(245,245,240,0.6);
  --c-text-faint: rgba(245,245,240,0.35);
  --font-serif: 'Cormorant Garamond', 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-body: 'Libre Baskerville', Georgia, serif;
  --nav-h: 68px;
  --radius-card: 18px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --transition-slow: 0.6s cubic-bezier(0.4,0,0.2,1);
}

/* ── 重置 & 基础 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%, rgba(201,168,76,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 80% 80%, rgba(201,168,76,0.05) 0%, transparent 55%);
  pointer-events: none;
  z-index: 0;
}

/* ── 跳过链接 ── */
.skip-link {
  position: absolute;
  top: -60px;
  left: 1rem;
  background: var(--c-gold);
  color: var(--c-bg);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  z-index: 1000;
  transition: top var(--transition);
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* ── 视觉隐藏 ── */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── 导航 ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(26,26,46,0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-glass-border);
}

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

.brand-mark {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.site-logo-mark,
.site-logo { display: block; }

.logo-text-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--c-gold), #a07830);
  color: var(--c-bg);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
  letter-spacing: -0.03em;
}

/* nav > ol > li > a */
.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  overflow: hidden;
}

.nav-list li {
  flex-shrink: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.75rem 0.85rem;
  min-height: 44px;
  text-decoration: none;
  color: var(--c-text-muted);
  font-family: var(--font-body);
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-gold);
  background: var(--c-gold-dim);
  outline: none;
}

.nav-icon {
  font-size: 0.75rem;
  opacity: 0.6;
  transition: opacity var(--transition);
}
.nav-link:hover .nav-icon { opacity: 1; }

.nav-cta {
  display: flex;
  align-items: center;
  padding: 0.75rem 1.25rem;
  min-height: 44px;
  background: linear-gradient(135deg, var(--c-gold), #b8903e);
  color: var(--c-bg);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  flex-shrink: 0;
  margin-left: auto;
  transition: transform var(--transition), box-shadow var(--transition);
  letter-spacing: 0.04em;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201,168,76,0.35);
}

/* ── Hero ── */
.hero-section {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 3rem) 1.5rem 3rem;
  z-index: 1;
}

.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.badge-dot {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--c-gold);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.badge-label {
  font-size: 0.8rem;
  font-family: var(--font-body);
  color: var(--c-gold);
  letter-spacing: 0.12em;
  font-weight: 700;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
  animation: slide-up 0.8s cubic-bezier(0.4,0,0.2,1) 0.15s both;
  background: linear-gradient(120deg, var(--c-white) 0%, var(--c-gold) 60%, var(--c-white) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@keyframes slide-up {
  from { transform: translateY(40px); opacity: 0; }
  to   { transform: translateY(0);   opacity: 1; }
}

.gradient-text {
  background: linear-gradient(120deg, var(--c-gold) 0%, #e8c96d 40%, #a07830 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1rem;
  color: var(--c-text-muted);
  line-height: 1.8;
  max-width: 480px;
  animation: fade-in 0.8s ease 0.55s both;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fade-in 0.8s ease 0.65s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  min-height: 50px;
  background: linear-gradient(135deg, var(--c-gold), #b8903e);
  color: var(--c-bg);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: var(--radius-card);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
  letter-spacing: 0.06em;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(201,168,76,0.4);
}

.btn-arrow {
  transition: transform var(--transition);
}
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 1.5rem;
  min-height: 50px;
  border: 1px solid var(--c-glass-border);
  color: var(--c-gold);
  font-family: var(--font-body);
  font-size: 0.9rem;
  border-radius: var(--radius-card);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
}
.btn-ghost:hover {
  background: var(--c-gold-dim);
  border-color: var(--c-gold);
}

.hero-badges {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  animation: fade-in 0.8s ease 0.75s both;
}

.float-badge {
  padding: 0 1rem;
  min-height: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--c-gold);
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: 0.1em;
  backdrop-filter: blur(6px);
  animation: float-y 3s ease-in-out infinite;
}
.float-badge:nth-child(2) { animation-delay: 0.5s; }
.float-badge:nth-child(3) { animation-delay: 1s; }

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-5px); }
}

/* Hero Figure */
.hero-figure {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  animation: fade-in 1s ease 0.3s both;
}

.hero-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-card);
}

.hero-placeholder {
  aspect-ratio: 4/3;
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-card);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
}

.placeholder-glyph {
  font-family: var(--font-serif);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--c-gold), rgba(201,168,76,0.3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: pulse-text 4s ease-in-out infinite;
}

@keyframes pulse-text {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ── 正文内容区 ── */
.content-sections-wrapper {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 3rem;
  align-items: start;
}

/* aside 在右侧 */
.toc-aside {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  grid-column: 2;
  grid-row: 1;
  order: 2;
}

.aside-heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-gold);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--c-glass-border);
}
.aside-heading-text { display: inline; }

.toc-list {
  list-style: none;
  padding: 0;
  counter-reset: toc-counter;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.toc-link {
  display: flex;
  align-items: center;
  padding: 0.55rem 0.6rem;
  min-height: 44px;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  counter-increment: toc-counter;
  line-height: 1.4;
}
.toc-link::before {
  content: counter(toc-counter, decimal-leading-zero);
  margin-right: 0.6rem;
  font-size: 0.7rem;
  color: var(--c-gold);
  font-family: var(--font-body);
  font-weight: 700;
  flex-shrink: 0;
}
.toc-link:hover {
  color: var(--c-gold);
  background: var(--c-gold-dim);
}

.aside-note {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--c-glass-border);
  font-size: 0.72rem;
  color: var(--c-text-faint);
  line-height: 1.6;
}

.main-content-area {
  grid-column: 1;
  grid-row: 1;
  order: 1;
  min-width: 0;
}

/* page.content 里的 div 样式 */
.main-content-area div,
main > div {
  padding: 3.5rem 0;
  border-bottom: 1px solid rgba(201,168,76,0.1);
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.main-content-area div:last-child { border-bottom: none; }

/* Kinetic reveal for sections */
.main-content-area div,
.reveal-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.main-content-area div.is-visible,
.reveal-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── 通用 HTML 元素（正文内容） ── */
h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
  margin-bottom: 1.2rem;
}
h2 > span {
  display: inline;
  position: relative;
}
h2 > span::after {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--c-gold), transparent);
  margin-top: 0.2em;
  width: 60%;
}

h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
  font-weight: 600;
  color: var(--c-gold);
  margin-bottom: 0.9rem;
  margin-top: 2rem;
  line-height: 1.3;
}
h3 > span { display: inline; }

h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.6rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1.1em;
  color: var(--c-text-muted);
  font-size: 1rem;
  line-height: 1.8;
}

a {
  color: var(--c-gold);
  text-decoration: underline;
  text-decoration-color: rgba(201,168,76,0.4);
  transition: color var(--transition), text-decoration-color var(--transition);
}
a:hover { color: var(--c-white); text-decoration-color: var(--c-gold); }

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2em;
  color: var(--c-text-muted);
  line-height: 1.8;
}
li { margin-bottom: 0.4em; }

strong { color: var(--c-white); font-weight: 700; }
em { color: var(--c-gold); font-style: italic; }

blockquote {
  border-left: 3px solid var(--c-gold);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--c-glass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-muted);
  font-style: italic;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
th {
  background: var(--c-gold-dim);
  color: var(--c-gold);
  padding: 0.75rem 1rem;
  text-align: left;
  font-family: var(--font-body);
  font-weight: 700;
  border-bottom: 1px solid var(--c-glass-border);
}
td {
  padding: 0.65rem 1rem;
  color: var(--c-text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
tr:hover td { background: var(--c-glass); }

figure {
  margin: 1.5rem 0;
  border-radius: var(--radius-card);
  overflow: hidden;
}
figure img {
  width: 100%;
  height: auto;
  display: block;
}
figcaption {
  font-size: 0.8rem;
  color: var(--c-text-faint);
  padding: 0.5rem;
  text-align: center;
  font-style: italic;
}

/* ── 玻璃卡片 ── */
.glass-card {
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
  border-color: rgba(201,168,76,0.5);
}

/* ── 分隔线装饰 ── */
.section-divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
  margin: 3rem 0;
  opacity: 0.4;
}

/* ── 页脚 ── */
.site-footer {
  position: relative;
  z-index: 1;
  background: var(--c-bg2);
  border-top: 1px solid var(--c-glass-border);
  padding: 0;
  margin-top: 2rem;
}

.footer-brand-bar {
  text-align: center;
  padding: 2.5rem 1.5rem 1rem;
  overflow: hidden;
}

.footer-brand-large {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(3rem, 10vw, 7rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--c-gold) 0%, rgba(201,168,76,0.2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  letter-spacing: -0.04em;
  user-select: none;
}

.footer-cols {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
}

.footer-dl {
  display: block;
}

.footer-dl-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-gold);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-glass-border);
  display: block;
}

.footer-dl dd {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.footer-keywords {
  font-size: 0.78rem !important;
  color: var(--c-text-faint) !important;
  letter-spacing: 0.05em;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition);
  padding: 0.2rem 0;
}
.footer-link:hover { color: var(--c-gold); text-decoration: none; }

.footer-contact {
  margin-top: 0.8rem;
  font-size: 0.8rem !important;
  color: var(--c-text-faint) !important;
}

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.copyright {
  font-size: 0.78rem;
  color: var(--c-text-faint);
  text-align: center;
  line-height: 1.6;
  margin: 0;
}

/* ── 滚动动效 ── */
@keyframes letter-in {
  from { opacity: 0; transform: translateY(20px) rotate(3deg); }
  to   { opacity: 1; transform: translateY(0) rotate(0); }
}

.kinetic-letter {
  display: inline-block;
  animation: letter-in 0.5s cubic-bezier(0.4,0,0.2,1) both;
}

/* ── Stagger list ── */
.stagger-list li {
  opacity: 0;
  transform: translateX(-16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.stagger-list.is-visible li { opacity: 1; transform: translateX(0); }
.stagger-list.is-visible li:nth-child(1) { transition-delay: 0.05s; }
.stagger-list.is-visible li:nth-child(2) { transition-delay: 0.10s; }
.stagger-list.is-visible li:nth-child(3) { transition-delay: 0.15s; }
.stagger-list.is-visible li:nth-child(4) { transition-delay: 0.20s; }
.stagger-list.is-visible li:nth-child(5) { transition-delay: 0.25s; }
.stagger-list.is-visible li:nth-child(6) { transition-delay: 0.30s; }
.stagger-list.is-visible li:nth-child(7) { transition-delay: 0.35s; }

/* ── prefers-reduced-motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .main-content-area div,
  .reveal-section {
    opacity: 1;
    transform: none;
  }
  .stagger-list li { opacity: 1; transform: none; }
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .content-sections-wrapper {
    grid-template-columns: 1fr;
  }
  .toc-aside {
    grid-column: 1;
    grid-row: auto;
    position: static;
    order: -1;
  }
  .main-content-area { grid-column: 1; }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }
  .footer-dl--about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }

  .main-nav { gap: 0.75rem; }

  .nav-list {
    display: none;
  }

  .nav-cta { margin-left: auto; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-figure { order: -1; }
  .hero-section { min-height: auto; padding-top: calc(var(--nav-h) + 2rem); }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer-dl--about { grid-column: 1; }

  .footer-brand-large {
    font-size: clamp(2.5rem, 15vw, 5rem);
  }
}

@media (max-width: 480px) {
  html { font-size: 16px; }

  .hero-actions { flex-direction: column; align-items: flex-start; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }

  .hero-badges { gap: 0.4rem; }

  .content-sections-wrapper { padding: 1rem 1rem 3rem; }

  .nav-cta { padding: 0.75rem 0.9rem; font-size: 0.82rem; min-height: 44px; }
}

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