/* 珍爱导航 · OLED暗夜主题 */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;500;600;700&family=Libre+Baskerville:wght@400;700&display=swap');

:root {
  --c-bg: #000000;
  --c-surface: #121212;
  --c-surface2: #1a1a1a;
  --c-border: #2a2a2a;
  --c-text: #e8e0d4;
  --c-text-muted: #888880;
  --c-text-dim: #555550;
  --c-accent: #c9a96e;
  --c-accent2: #7eb8c9;
  --c-accent3: #a78bca;
  --c-white: #ffffff;
  --c-glow-gold: rgba(201,169,110,0.25);
  --c-glow-blue: rgba(126,184,201,0.2);
  --font-serif: 'Cormorant Garamond', 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius: 10px;
  --header-h: 64px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  color-scheme: dark;
}

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

html {
  font-size: 17px;
  line-height: 1.7;
  scroll-behavior: smooth;
  background: var(--c-bg);
  color: var(--c-text);
}

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

/* ── 排版基础 ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--c-white);
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

p { margin-bottom: 1.2em; line-height: 1.8; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color var(--transition), text-shadow var(--transition);
}
a:hover {
  color: var(--c-white);
  text-shadow: 0 0 10px var(--c-glow-gold);
}
a:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 1.2em 0;
}

ul, ol { padding-left: 1.5em; margin-bottom: 1.2em; }
li { margin-bottom: 0.4em; }

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

/* ── 头部 ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: var(--header-h);
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--c-white);
  min-height: 44px;
  padding: 4px 0;
}
.brand-logo:hover { text-shadow: none; }

.brand-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.brand-text-mark {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  border-radius: 6px;
  text-shadow: 0 0 10px var(--c-glow-gold);
}

/* ── 汉堡按钮 ── */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  cursor: pointer;
  padding: 10px;
  transition: border-color var(--transition);
}
.nav-toggle:hover { border-color: var(--c-accent); }

.hamburger-line {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--c-text);
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}
.nav-toggle:hover .hamburger-line { background: var(--c-accent); }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── 全屏导航菜单 ── */
.fullscreen-nav {
  position: fixed;
  inset: 0;
  z-index: 800;
  background: rgba(0,0,0,0.98);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.fullscreen-nav.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav-close {
  position: absolute;
  top: 1.2rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  color: var(--c-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), color var(--transition);
}
.nav-close:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: var(--c-text);
  padding: 0.7rem 2rem;
  min-height: 44px;
  display: flex;
  align-items: center;
  text-align: center;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition), text-shadow var(--transition);
  letter-spacing: 0.04em;
}
.nav-links a:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
  text-shadow: 0 0 10px var(--c-glow-gold);
}

/* ── 主体 ── */
.page-main {
  margin-top: var(--header-h);
}

.wrap {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Hero (首页) ── */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 4rem 0;
  margin-top: calc(-1 * var(--header-h));
  padding-top: calc(var(--header-h) + 4rem);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  padding: 0 1rem;
}

.hero-bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  font-family: var(--font-serif);
  font-size: clamp(8rem, 25vw, 20rem);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201,169,110,0.08);
  letter-spacing: 0.1em;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--c-white);
  text-shadow: 0 0 40px rgba(201,169,110,0.15);
  margin-bottom: 1.2rem;
  line-height: 1.15;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

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

/* ── 页面Hero (内页) ── */
.page-hero-section {
  position: relative;
  overflow: hidden;
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--c-border);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.page-hero-bg {
  position: absolute;
  right: -2rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-serif);
  font-size: clamp(5rem, 15vw, 12rem);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201,169,110,0.06);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.page-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.page-hero-section h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 0.8rem;
}

.page-date, .page-date-mod {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--c-text-dim);
  margin-top: 0.5rem;
  margin-right: 1rem;
}

/* ── 内容区布局 ── */
.content-section {
  padding: 4rem 0;
}

.content-body {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
}

/* ── 左侧边栏 ── */
.sidebar-left {
  flex: 0 0 220px;
  position: sticky;
  top: calc(var(--header-h) + 2rem);
}

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

.sidebar-inner h3 {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  font-family: var(--font-sans);
  margin-bottom: 0.6rem;
}

.sidebar-inner hr { margin: 0.6rem 0 0.8rem; }

.sidebar-link {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--c-text-muted);
  padding: 0.45rem 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  line-height: 1.4;
}
.sidebar-link:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-border);
  text-shadow: none;
}

.sidebar-divider {
  height: 1px;
  background: var(--c-border);
  margin: 0.8rem 0;
}

/* ── 主内容 ── */
.main-content {
  flex: 1;
  min-width: 0;
}

.page-content {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-text);
}
.page-content h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 0.6rem;
  padding-bottom: 0.4rem;
}
.page-content h3 {
  font-size: 1.2rem;
  margin: 2rem 0 0.5rem;
  color: var(--c-accent);
}
.page-content p { margin-bottom: 1.3em; }
.page-content ul, .page-content ol { margin-bottom: 1.3em; }
.page-content a { color: var(--c-accent2); }
.page-content a:hover { color: var(--c-white); text-shadow: 0 0 10px var(--c-glow-blue); }
.page-content blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 0.8rem 1.2rem;
  margin: 1.5rem 0;
  background: var(--c-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--c-text-muted);
  font-style: italic;
}

/* ── 按钮 ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.8rem;
  min-height: 44px;
  background: var(--c-accent);
  color: #000;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}
.btn-primary:hover {
  background: var(--c-white);
  box-shadow: 0 0 20px var(--c-glow-gold);
  transform: translateY(-1px);
  color: #000;
  text-shadow: none;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.8rem;
  min-height: 44px;
  background: transparent;
  color: var(--c-accent);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border: 1px solid var(--c-accent);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}
.btn-outline:hover {
  background: var(--c-accent);
  color: #000;
  box-shadow: 0 0 20px var(--c-glow-gold);
  text-shadow: none;
}

/* ── 卡片链接 ── */
.card-link {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.2rem 1.4rem;
  background: var(--c-surface);
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  color: var(--c-text);
}
.card-link:hover {
  border-color: var(--c-accent);
  background: var(--c-surface2);
  transform: translateY(-2px);
  text-shadow: none;
  color: var(--c-text);
}
.card-link strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-white);
  line-height: 1.4;
}
.card-link span {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}

/* ── 卡片网格 ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

/* ── FAQ预览/相关区块 ── */
.faq-preview-section,
.faq-related,
.about-links,
.privacy-footer-links {
  padding: 3rem 0;
  border-top: 1px solid var(--c-border);
}
.faq-preview-section h2,
.faq-related h2,
.about-links h2,
.privacy-footer-links h2 {
  margin-bottom: 0.2rem;
}

.section-more {
  margin-top: 2rem;
  text-align: center;
}

.related-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

/* ── 联系表单 ── */
.contact-form-area {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--c-border);
}
.contact-form-area h2 { margin-bottom: 0.2rem; }

.contact-form {
  margin-top: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  max-width: 560px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-field label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-text-muted);
  letter-spacing: 0.06em;
}

.form-field input,
.form-field select,
.form-field textarea {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  min-height: 44px;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}
.form-field textarea { min-height: 120px; resize: vertical; }

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-glow-gold);
}

.form-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23888880' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-field select option { background: var(--c-surface); }

/* ── 页脚 ── */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  margin-top: 4rem;
}

.site-footer > div {
  display: inline-block;
}

.site-footer > div:not(.footer-bottom) {
  display: block;
}

/* 四栏布局 */
.site-footer {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto auto;
  gap: 0;
}

.site-footer > div:not(:last-of-type) {
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--c-border);
}
.site-footer > div:last-of-type {
  padding: 2.5rem 2rem;
}

.site-footer h3 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: 0.8rem;
}

.site-footer a {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-text-muted);
  padding: 0.25rem 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.site-footer a:hover {
  color: var(--c-accent);
  text-shadow: none;
}

.footer-bottom {
  grid-column: 1 / -1;
  padding: 1.2rem 2rem;
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--c-text-dim);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-links a {
  display: inline;
  min-height: auto;
  font-size: 0.78rem;
  color: var(--c-text-dim);
  padding: 0;
}
.footer-links a:hover { color: var(--c-accent); }

/* ── 滚动揭示动效 ── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .content-body {
    gap: 2rem;
  }
  .sidebar-left {
    flex: 0 0 180px;
  }
  .site-footer {
    grid-template-columns: repeat(2, 1fr);
  }
  .site-footer > div:nth-child(2) {
    border-right: none;
  }
}

@media (max-width: 768px) {
  :root { --header-h: 56px; }

  .content-body {
    flex-direction: column;
  }
  .sidebar-left {
    flex: none;
    width: 100%;
    position: static;
  }
  .sidebar-inner {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.2rem;
  }
  .sidebar-inner h3 {
    grid-column: 1 / -1;
  }
  .sidebar-inner hr {
    grid-column: 1 / -1;
  }

  .hero-section {
    padding-top: calc(var(--header-h) + 3rem);
    padding-bottom: 3rem;
  }
  .hero-content h1 {
    font-size: clamp(1.8rem, 8vw, 3rem);
  }

  .page-hero-section {
    padding: 3rem 0 2rem;
  }

  .card-grid,
  .related-cards {
    grid-template-columns: 1fr;
  }

  .site-footer {
    grid-template-columns: 1fr 1fr;
  }
  .site-footer > div {
    border-right: none !important;
    border-bottom: 1px solid var(--c-border);
    padding: 1.8rem 1.2rem;
  }
  .footer-bottom {
    padding: 1rem 1.2rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .wrap { padding: 0 1rem; }

  .site-footer {
    grid-template-columns: 1fr;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  .btn-primary, .btn-outline {
    width: 100%;
    max-width: 300px;
  }

  .sidebar-inner {
    grid-template-columns: 1fr;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .footer-links {
    gap: 1rem;
  }
}

/* ── Focus 可见性 ── */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ── 选中颜色 ── */
::selection {
  background: rgba(201,169,110,0.3);
  color: var(--c-white);
}