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

/* ===== 设计令牌 ===== */
:root {
  --c-bg: #1A1A2E;
  --c-accent: #E94560;
  --c-ink: #F5F0E8;
  --c-bg2: #16213E;
  --c-bg3: #0F3460;
  --c-muted: rgba(245,240,232,0.5);
  --c-border: rgba(245,240,232,0.12);
  --c-card-bg: rgba(255,255,255,0.04);
  --c-card-hover: rgba(233,69,96,0.08);
  --font-serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius: 4px;
  --nav-h: 100px;
  --max-prose: 720px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 4px rgba(233,69,96,0.1);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--c-accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; }

/* ===== 无障碍：减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26,26,46,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2rem;
  border-bottom: 1px solid var(--c-border);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}
.brand-name:hover { color: var(--c-accent); opacity: 1; }

.header-contact {
  font-size: 0.78rem;
  color: var(--c-muted);
  letter-spacing: 0.08em;
  text-transform: none;
}

/* ===== 导航：details > summary + menu > li > a ===== */
.site-nav { padding: 0 2rem; }

.nav-details { position: relative; }

.nav-summary {
  display: none;
  list-style: none;
  cursor: pointer;
  padding: 0.75rem 0;
  font-size: 0.85rem;
  color: var(--c-muted);
  min-height: 44px;
  align-items: center;
}
.nav-summary::-webkit-details-marker { display: none; }

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 0;
}

.nav-menu li a {
  display: block;
  padding: 0.7rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav-menu li a:hover {
  color: var(--c-ink);
  border-bottom-color: var(--c-accent);
  opacity: 1;
}

/* ===== 主体 flex 扩展 ===== */
main { flex: 1; }

/* ===== Kinetic 动效 ===== */
@keyframes kinetic-reveal {
  from { opacity: 0; transform: translateY(32px) skewY(2deg); }
  to   { opacity: 1; transform: translateY(0) skewY(0); }
}

@keyframes kinetic-label-in {
  from { opacity: 0; letter-spacing: 0.4em; }
  to   { opacity: 1; letter-spacing: 0.2em; }
}

@keyframes typing-cursor {
  0%, 100% { border-right-color: var(--c-accent); }
  50% { border-right-color: transparent; }
}

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

@keyframes bg-text-float {
  from { transform: translateY(0); }
  to   { transform: translateY(-12px); }
}

.kinetic-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  text-transform: uppercase;
  animation: kinetic-label-in 0.8s ease both;
}

.kinetic-h1 {
  animation: kinetic-reveal 0.9s 0.1s ease both;
}

/* ===== 首页 Hero ===== */
.hero-section {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 2rem 4rem;
  gap: 3rem;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg2) 60%, var(--c-bg3) 100%);
}

.hero-text-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  z-index: 2;
}

.hero-eyebrow {
  margin-bottom: 0.25rem;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-ink);
  letter-spacing: -0.01em;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--c-muted);
  max-width: 480px;
  animation: fade-up 0.9s 0.3s ease both;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  letter-spacing: 0.04em;
  width: fit-content;
  min-height: 48px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  animation: fade-up 0.9s 0.5s ease both;
}
.cta-btn:hover {
  background: #c73652;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(233,69,96,0.35);
  opacity: 1;
}

.hero-media-col {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.hero-img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  max-height: 60vh;
  object-fit: cover;
  animation: fade-up 1s 0.2s ease both;
}

.hero-bg-text {
  position: absolute;
  font-family: var(--font-serif);
  font-size: clamp(5rem, 15vw, 14rem);
  font-weight: 700;
  color: rgba(245,240,232,0.04);
  letter-spacing: -0.02em;
  user-select: none;
  pointer-events: none;
  white-space: nowrap;
  animation: bg-text-float 6s ease-in-out infinite alternate;
  z-index: 1;
}

/* ===== 内容区通用布局（带 aside）===== */
.content-section,
.guide-body-section,
.faq-body-section,
.changelog-body-section,
.about-body-section,
.privacy-body-section {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.content-body {
  min-width: 0;
}

/* ===== Aside ===== */
.page-aside {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  align-self: start;
  border-left: 2px solid var(--c-accent);
  padding-left: 1.25rem;
}

.aside-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.aside-links li a {
  font-size: 0.85rem;
  color: var(--c-muted);
  display: block;
  padding: 0.2rem 0;
  transition: color var(--transition);
}
.aside-links li a:hover { color: var(--c-ink); opacity: 1; }

.sibling-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sibling-link {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius);
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  transition: background var(--transition), border-color var(--transition);
}
.sibling-link:hover {
  background: var(--c-card-hover);
  border-color: var(--c-accent);
  opacity: 1;
}
.sibling-link.current {
  border-color: var(--c-accent);
  background: rgba(233,69,96,0.1);
}
.sibling-link strong {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-ink);
  line-height: 1.4;
}

/* ===== 子页卡片（并列 a > strong）===== */
.child-cards,
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.child-card,
.guide-block {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
  color: var(--c-ink);
}
.child-card:hover,
.guide-block:hover {
  background: var(--c-card-hover);
  border-color: var(--c-accent);
  transform: translateY(-3px);
  opacity: 1;
}
.child-card strong,
.guide-block strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.4;
}
.child-card span,
.guide-block span {
  font-size: 0.83rem;
  color: var(--c-muted);
  line-height: 1.5;
}

/* ===== 指南区块 ===== */
.guides-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.section-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.section-h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 2rem;
  line-height: 1.2;
}

/* ===== 日期 ===== */
.page-date {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--c-muted);
  background: rgba(245,240,232,0.06);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  margin-bottom: 1rem;
  margin-right: 0.5rem;
}
.page-modified {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--c-muted);
  margin-bottom: 1rem;
}

.guide-dates {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ===== Guide Hero ===== */
.guide-hero-section {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
  padding: 4rem 2rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.guide-hero-text { flex: 1; }

.guide-seq {
  margin-bottom: 0.5rem;
}

.guide-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
}

.guide-desc {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 540px;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--c-muted); }
.breadcrumb a:hover { color: var(--c-accent); opacity: 1; }

.guide-hero-img {
  width: 220px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  object-fit: cover;
}

/* ===== FAQ Hero ===== */
.faq-header-section {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg2) 100%);
  padding: 5rem 2rem 3rem;
  text-align: center;
}

.faq-header-inner {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.faq-seq { margin-bottom: 0.5rem; }

.faq-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.15;
  margin: 0.5rem 0 1rem;
}

.faq-desc {
  font-size: 1rem;
  color: var(--c-muted);
}

.faq-bg-text {
  position: absolute;
  bottom: -0.2em;
  right: 5%;
  font-family: var(--font-serif);
  font-size: clamp(5rem, 18vw, 14rem);
  font-weight: 700;
  color: rgba(245,240,232,0.03);
  user-select: none;
  pointer-events: none;
  white-space: nowrap;
}

/* ===== Changelog Hero ===== */
.changelog-header-section {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, var(--c-bg3) 0%, var(--c-bg) 100%);
  padding: 5rem 2rem 3rem;
}

.changelog-header-inner {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}

.changelog-seq { margin-bottom: 0.5rem; }

.changelog-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
}

.changelog-desc {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 540px;
}

.changelog-bg-text {
  position: absolute;
  top: 50%;
  right: 4%;
  transform: translateY(-50%);
  font-family: var(--font-serif);
  font-size: clamp(4rem, 14vw, 12rem);
  font-weight: 700;
  color: rgba(245,240,232,0.03);
  user-select: none;
  pointer-events: none;
}

/* ===== About Hero ===== */
.about-header-section {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
  padding: 5rem 2rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.about-seq { margin-bottom: 0.5rem; }

.about-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
}

.about-desc {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 480px;
  margin-bottom: 1rem;
}

.about-hero-img {
  width: 200px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  object-fit: cover;
}

.about-bg-text {
  position: absolute;
  bottom: 0;
  right: 2%;
  font-family: var(--font-serif);
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 700;
  color: rgba(245,240,232,0.03);
  user-select: none;
  pointer-events: none;
}

/* ===== Privacy Hero ===== */
.privacy-header-section {
  background: linear-gradient(135deg, var(--c-bg2) 0%, var(--c-bg) 100%);
  padding: 4rem 2rem 2.5rem;
}

.privacy-header-inner {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-seq { margin-bottom: 0.5rem; }

.privacy-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
}

.privacy-desc {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 540px;
}

/* ===== Prose 正文排版 ===== */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-ink);
  max-width: var(--max-prose);
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-ink);
  margin: 2.5rem 0 1rem;
  line-height: 1.3;
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-ink);
  margin: 2rem 0 0.75rem;
}

.prose p {
  margin-bottom: 1.25rem;
  color: rgba(245,240,232,0.88);
}

.prose ul, .prose ol {
  margin: 1rem 0 1.5rem 1.25rem;
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }

.prose li {
  margin-bottom: 0.5rem;
  color: rgba(245,240,232,0.85);
}

.prose strong {
  color: var(--c-ink);
  font-weight: 600;
}

.prose a {
  color: var(--c-accent);
  border-bottom: 1px solid rgba(233,69,96,0.3);
  transition: border-color var(--transition);
}
.prose a:hover { border-bottom-color: var(--c-accent); opacity: 1; }

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--c-card-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--c-muted);
  font-style: italic;
}

.prose code {
  font-family: 'Courier New', monospace;
  font-size: 0.88em;
  background: rgba(255,255,255,0.07);
  padding: 0.15em 0.4em;
  border-radius: 2px;
}

.prose pre {
  background: rgba(255,255,255,0.05);
  padding: 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.prose th {
  background: rgba(255,255,255,0.06);
  padding: 0.6rem 0.9rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--c-border);
}

.prose td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--c-border);
  color: rgba(245,240,232,0.82);
}

/* small 眉题紧邻 h2/h3 前 */
small + h2,
small + h3 {
  margin-top: 0.25rem;
}

small.section-eyebrow,
.prose small {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

/* ===== Scroll-reveal 动效 ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
  padding: 3rem 2rem 0;
  margin-top: auto;
}

.footer-brand-row {
  text-align: center;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--c-border);
  overflow: hidden;
}

.footer-big-brand {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 10vw, 8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, rgba(245,240,232,0.06) 0%, rgba(233,69,96,0.15) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  user-select: none;
  display: block;
  line-height: 1;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 2.5rem 0 2rem;
}

.footer-dl dt {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-dl dd {
  margin-bottom: 0.55rem;
  font-size: 0.85rem;
  color: var(--c-muted);
  line-height: 1.5;
}

.footer-dl dd a {
  color: var(--c-muted);
  transition: color var(--transition);
}
.footer-dl dd a:hover { color: var(--c-ink); opacity: 1; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  border-top: 1px solid var(--c-border);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer-copy {
  font-size: 0.78rem;
  color: rgba(245,240,232,0.35);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}
.footer-links a {
  font-size: 0.78rem;
  color: rgba(245,240,232,0.35);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}
.footer-links a:hover { color: var(--c-muted); opacity: 1; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-section {
    padding: 2rem 2rem;
    gap: 2rem;
  }
  .guide-hero-section { grid-template-columns: 1fr; }
  .guide-hero-img { display: none; }
  .about-header-section { grid-template-columns: 1fr; }
  .about-hero-img { display: none; }
}

@media (max-width: 768px) {
  .header-brand-row { padding: 0.75rem 1rem; }
  .site-nav { padding: 0 1rem; }

  .nav-details[open] { }
  .nav-summary { display: flex; }
  .nav-details:not([open]) .nav-menu { display: none; }
  .nav-menu {
    flex-direction: column;
    padding-bottom: 0.5rem;
  }
  .nav-menu li a {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--c-border);
    white-space: normal;
  }

  .hero-section {
    grid-template-columns: 1fr;
    min-height: 100svh;
    padding: 6rem 1.25rem 3rem;
    text-align: center;
  }
  .hero-media-col { order: -1; }
  .hero-bg-text { font-size: 5rem; }
  .hero-desc { margin: 0 auto; }
  .cta-btn { margin: 0 auto; }

  .content-section,
  .guide-body-section,
  .faq-body-section,
  .changelog-body-section,
  .about-body-section,
  .privacy-body-section {
    grid-template-columns: 1fr;
    padding: 2rem 1.25rem;
    gap: 2rem;
  }

  .page-aside {
    position: static;
    border-left: none;
    border-top: 2px solid var(--c-accent);
    padding-left: 0;
    padding-top: 1.25rem;
  }

  .guide-hero-section {
    padding: 2rem 1.25rem 1rem;
    gap: 1rem;
  }

  .faq-header-section,
  .changelog-header-section,
  .about-header-section,
  .privacy-header-section {
    padding: 3rem 1.25rem 2rem;
  }

  .about-header-section { grid-template-columns: 1fr; }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .child-cards,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .guides-section {
    padding: 2rem 1.25rem 3rem;
  }
}

@media (max-width: 480px) {
  .brand-name { font-size: 1.1rem; }
  .footer-big-brand { font-size: 3rem; }
  .hero-h1 { font-size: 1.9rem; }
}