@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');

/* =====================
   CSS 变量 & 重置
   ===================== */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-ink: #000000;
  --c-grey-90: #111111;
  --c-grey-80: #222222;
  --c-grey-60: #555555;
  --c-grey-20: #cccccc;
  --c-grey-10: #eeeeee;
  --c-glass-bg: rgba(255,255,255,0.06);
  --c-glass-border: rgba(255,255,255,0.15);

  --font-serif: 'EB Garamond', 'Crimson Text', Georgia, 'Times New Roman', serif;
  --font-sans: system-ui, -apple-system, sans-serif;

  --nav-width: 220px;
  --content-max: 860px;
  --section-pad: 5rem;

  --transition-fast: 0.18s ease;
  --transition-mid: 0.32s ease;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-serif);
  background: var(--c-white);
  color: var(--c-black);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* =====================
   布局骨架
   ===================== */
.site-wrap {
  display: flex;
  min-height: 100vh;
}

/* =====================
   左侧固定导航
   ===================== */
.sidenav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 2rem 1.25rem;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidenav-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.1rem;
  text-decoration: none;
  margin-bottom: 2.5rem;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidenav-brand:hover {
  background: var(--c-grey-10);
}

.sidenav-brand img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.brand-icon {
  font-size: 1.2rem;
  font-weight: 800;
}

.sidenav-menu {
  flex: 1;
  width: 100%;
}

.sidenav-menu p {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidenav-menu p a {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-grey-20);
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  line-height: 1.4;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  min-height: 40px;
}

.sidenav-menu p a:hover {
  color: var(--c-white);
  padding-left: 1rem;
}

.sidenav-cta {
  display: block;
  width: 100%;
  margin-top: 2rem;
  padding: 0.75rem 1rem;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.85rem;
  text-align: center;
  letter-spacing: 0.05em;
  text-transform: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
  line-height: 44px;
  padding-top: 0;
  padding-bottom: 0;
  flex-shrink: 0;
}

.sidenav-cta:hover {
  background: var(--c-grey-10);
}

/* =====================
   主内容区
   ===================== */
.main-content {
  margin-left: var(--nav-width);
  flex: 1;
  min-width: 0;
}

/* =====================
   Hero — 首页双图错位
   ===================== */
.hero--home {
  position: relative;
  min-height: 100vh;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-img-wrap {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-img {
  position: absolute;
  object-fit: cover;
}

.hero-img-1 {
  width: 58%;
  height: 75%;
  top: 0;
  right: 0;
  object-position: center;
  opacity: 0.55;
}

.hero-img-2 {
  width: 42%;
  height: 55%;
  bottom: 8%;
  left: 0;
  object-position: center top;
  opacity: 0.4;
}

.hero-slash {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    118deg,
    var(--c-black) 42%,
    transparent 42%,
    transparent 58%,
    rgba(0,0,0,0.7) 58%
  );
  z-index: 1;
}

.hero-text {
  position: relative;
  z-index: 2;
  padding: 8rem 4rem 6rem;
  max-width: 700px;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 10vw, 9rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.04em;
  color: var(--c-white);
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: rgba(255,255,255,0.75);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero-btn {
  display: inline-block;
  padding: 0.85rem 2.2rem;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  transition: background var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
}

.hero-btn:hover {
  background: var(--c-grey-10);
}

/* =====================
   页面 Hero（内页）
   ===================== */
.page-hero {
  position: relative;
  background: var(--c-black);
  color: var(--c-white);
  padding: 6rem 4rem 4rem;
  overflow: hidden;
  min-height: 40vh;
  display: flex;
  align-items: flex-end;
}

.page-hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--content-max);
}

.page-hero--compare {
  background: var(--c-black);
}

.page-hero--ranking {
  background: var(--c-black);
}

.page-hero--review {
  background: var(--c-black);
}

.page-hero--about {
  min-height: 50vh;
}

.page-hero--privacy {
  min-height: 35vh;
}

.page-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--c-white);
  margin-top: 0.75rem;
  margin-bottom: 1.25rem;
}

.ranking-h1 {
  font-size: clamp(2.2rem, 7vw, 7rem);
}

.about-h1 {
  font-size: clamp(2.5rem, 8vw, 8rem);
}

.hero-slash-sm {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-white);
  clip-path: polygon(0 60%, 100% 0, 100% 100%, 0 100%);
  z-index: 3;
}

.ranking-accent {
  position: absolute;
  right: 4rem;
  bottom: 2rem;
  z-index: 1;
}

.rank-num {
  font-family: var(--font-serif);
  font-size: clamp(6rem, 20vw, 18rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  color: rgba(255,255,255,0.07);
  line-height: 1;
  user-select: none;
}

.about-deco {
  position: absolute;
  right: 3rem;
  bottom: 2rem;
  z-index: 1;
}

.deco-word {
  font-family: var(--font-serif);
  font-size: clamp(5rem, 15vw, 14rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  color: rgba(255,255,255,0.06);
  line-height: 1;
  user-select: none;
}

/* =====================
   评测页 Hero 图片
   ===================== */
.review-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.review-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.review-hero-inner {
  z-index: 2;
}

/* =====================
   页面元数据
   ===================== */
.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.page-date {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.03em;
}

/* =====================
   内容区域
   ===================== */
.content-section {
  padding: var(--section-pad) 4rem;
  max-width: calc(var(--content-max) + 340px);
}

.content-with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
}

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

/* 正文排版 */
.content-body h2,
.content-body h3,
.content-body h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.content-body h2 {
  font-size: clamp(1.4rem, 3vw, 2.2rem);
}

.content-body h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
}

.content-body p {
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.75;
}

.content-body ul,
.content-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  list-style: disc;
}

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

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

.content-body th,
.content-body td {
  border: 1px solid var(--c-grey-20);
  padding: 0.6rem 0.9rem;
  text-align: left;
}

.content-body th {
  background: var(--c-black);
  color: var(--c-white);
  font-weight: 700;
}

.content-body blockquote {
  border-left: 4px solid var(--c-black);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--c-grey-60);
}

.content-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition-fast);
}

.content-body a:hover {
  opacity: 0.6;
}

/* =====================
   侧边栏
   ===================== */
.content-aside {
  position: sticky;
  top: 2rem;
}

.aside-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
  margin-top: 0.3rem;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--c-black);
}

.aside-links li a {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.88rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--c-grey-20);
  color: var(--c-black);
  transition: padding-left var(--transition-fast), color var(--transition-fast);
  line-height: 1.4;
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-links li a:hover {
  padding-left: 0.5rem;
  color: var(--c-grey-60);
}

/* =====================
   眉题 small
   ===================== */
.eyebrow {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-grey-60);
  margin-bottom: 0.4rem;
}

/* =====================
   卡片（玻璃拟态，0圆角）
   ===================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--c-glass-bg);
  border: 1px solid var(--c-grey-20);
  padding: 1.75rem;
  position: relative;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--c-black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-mid);
}

.card:hover {
  border-color: var(--c-black);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.card h3 a {
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.card h3 a:hover {
  opacity: 0.65;
}

.card p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--c-grey-60);
}

/* 交错动画 */
.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.5s ease forwards;
  animation-delay: calc(var(--i, 0) * 0.08s);
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =====================
   节段标题
   ===================== */
.section-header {
  margin-bottom: 2rem;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-top: 0.3rem;
}

.related-section {
  background: var(--c-grey-10);
  padding: var(--section-pad) 4rem;
}

.related-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-top: 0.3rem;
  margin-bottom: 1rem;
}

/* =====================
   首页专用分区
   ===================== */
.home-content {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.home-cards {
  background: var(--c-grey-10);
}

/* =====================
   关于页
   ===================== */
.about-body p:first-child {
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--c-grey-80);
}

/* =====================
   隐私页
   ===================== */
.privacy-body h2 {
  margin-top: 3rem;
  border-top: 1px solid var(--c-grey-20);
  padding-top: 1.5rem;
}

/* =====================
   页脚
   ===================== */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  margin-left: var(--nav-width);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3rem;
  padding: 4rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.footer-brand-col p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.65;
}

.footer-form-col address {
  font-style: normal;
}

.footer-form-col address p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  margin: 0.5rem 0 1rem;
  line-height: 1.6;
}

.footer-form-col address a {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.85rem;
  transition: background var(--transition-fast);
  min-height: 40px;
  line-height: 28px;
}

.footer-form-col address a:hover {
  background: var(--c-grey-10);
}

.footer-nav-col .eyebrow {
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.75rem;
}

.footer-nav-col ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-nav-col ul li a {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition-fast);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.footer-nav-col ul li a:hover {
  color: var(--c-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 4rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal li a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition-fast);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-legal li a:hover {
  color: var(--c-white);
}

/* =====================
   移动端汉堡 & 响应式
   ===================== */
.nav-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  width: 44px;
  height: 44px;
  background: var(--c-black);
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 10px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-white);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

@media (max-width: 900px) {
  :root {
    --nav-width: 0px;
    --section-pad: 3rem;
  }

  .nav-toggle {
    display: flex;
  }

  .sidenav {
    width: 260px;
    transform: translateX(-100%);
    transition: transform var(--transition-mid);
  }

  .sidenav.is-open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding-top: 60px;
  }

  .site-footer {
    margin-left: 0;
  }

  .hero-text {
    padding: 5rem 1.75rem 4rem;
  }

  .hero-img-1,
  .hero-img-2 {
    opacity: 0.3;
  }

  .content-section {
    padding: var(--section-pad) 1.75rem;
  }

  .content-with-aside {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .content-aside {
    position: static;
  }

  .page-hero {
    padding: 5rem 1.75rem 3.5rem;
    min-height: 45vh;
  }

  .ranking-accent {
    right: 1.5rem;
  }

  .about-deco {
    right: 1.5rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 1.75rem;
  }

  .footer-bottom {
    padding: 1.25rem 1.75rem;
  }

  .related-section {
    padding: var(--section-pad) 1.75rem;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 17px;
  }

  .hero-h1 {
    font-size: clamp(2.5rem, 12vw, 5rem);
  }

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

  .page-h1 {
    font-size: clamp(1.8rem, 8vw, 3.5rem);
  }

  .hero-text {
    padding: 4rem 1.25rem 3rem;
  }

  .content-section {
    padding: 2.5rem 1.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  .stagger-item {
    opacity: 1;
    transform: none;
    animation: none;
  }

  html {
    scroll-behavior: auto;
  }
}