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

/* =============================================
   CSS 变量 & 基础重置
   ============================================= */
:root {
  --black: #000000;
  --white: #ffffff;
  --accent: #e8ff00;
  --gray-100: #f5f5f5;
  --gray-200: #e0e0e0;
  --gray-400: #9e9e9e;
  --gray-800: #1a1a1a;
  --gray-900: #0d0d0d;

  --font-display: 'Syne', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Manrope', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --radius-card: 18px;
  --border: 2px solid var(--black);

  --max-w: 1200px;
  --max-prose: 780px;

  --header-h: 120px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body.theme-dark {
  background: var(--black);
  color: var(--white);
}

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

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

ul, ol {
  list-style: none;
}

/* =============================================
   隐藏的侧边 aside（导航结构契约用，视觉隐藏）
   ============================================= */
.site-aside {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* =============================================
   页面外壳
   ============================================= */
.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =============================================
   顶部导航：两行（品牌行 + 菜单行）
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--black);
  border-bottom: 2px solid var(--white);
}

.header-brand-row {
  padding: 1rem 2rem 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.15);
}

.brand-link {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--white);
  text-transform: uppercase;
}

.brand-link:hover {
  color: var(--accent);
}

.header-nav-row {
  padding: 0.5rem 2rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.header-nav-row::-webkit-scrollbar {
  display: none;
}

.top-nav-list {
  display: flex;
  gap: 0;
  flex-wrap: nowrap;
}

.top-nav-list li a {
  display: block;
  padding: 0.65rem 1rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--gray-400);
  white-space: nowrap;
  border-right: 1px solid rgba(255,255,255,0.1);
  min-height: 40px;
  line-height: 1.2;
  display: flex;
  align-items: center;
  transition: color 0.2s, background 0.2s;
}

.top-nav-list li:last-child a {
  border-right: none;
}

.top-nav-list li a:hover,
.top-nav-list li a[aria-current="page"] {
  color: var(--white);
  background: rgba(255,255,255,0.06);
}

/* =============================================
   main / wrap 结构
   ============================================= */
main {
  flex: 1;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

/* =============================================
   HERO — 首页（100vh 满屏）
   ============================================= */
.hero-section {
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border-bottom: 2px solid var(--white);
}

.hero-inner {
  text-align: center;
  position: relative;
  z-index: 2;
  padding: 6rem 1rem;
}

.hero-bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-display);
  font-size: clamp(10rem, 40vw, 32rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: rgba(255,255,255,0.04);
  pointer-events: none;
  user-select: none;
  z-index: 0;
  line-height: 1;
}

.hero-inner h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1.05;
  color: var(--white);
  max-width: 900px;
  margin: 0 auto 2rem;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--gray-400);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* =============================================
   内页 Hero（非首页）
   ============================================= */
.page-hero-section {
  padding: 5rem 0 3rem;
  border-bottom: 2px solid rgba(255,255,255,0.12);
  position: relative;
  overflow: hidden;
}

.page-hero-inner {
  position: relative;
  z-index: 2;
}

.page-hero-bg {
  position: absolute;
  top: -1rem;
  right: -2rem;
  font-family: var(--font-display);
  font-size: clamp(6rem, 20vw, 16rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: rgba(255,255,255,0.04);
  pointer-events: none;
  user-select: none;
  z-index: 0;
  line-height: 1;
}

.page-hero-inner h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--white);
  max-width: 900px;
  margin-bottom: 1rem;
}

.page-hero-desc {
  font-size: 1.05rem;
  color: var(--gray-400);
  max-width: 680px;
  line-height: 1.65;
  margin-top: 0.5rem;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.page-date {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--gray-400);
  margin-top: 0.75rem;
  margin-right: 1rem;
  font-variant-numeric: tabular-nums;
}

/* =============================================
   正文容器（prose）
   ============================================= */
.content-section {
  padding: 4rem 0;
}

.prose-content {
  max-width: var(--max-prose);
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.88);
}

.prose-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--white);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--white);
}

.prose-content h3 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--white);
  margin: 2rem 0 0.75rem;
}

.prose-content p {
  margin-bottom: 1.2rem;
}

.prose-content ul,
.prose-content ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

.prose-content ol {
  list-style: decimal;
}

.prose-content li {
  margin-bottom: 0.4rem;
}

.prose-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose-content a:hover {
  color: var(--white);
}

.prose-content blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: rgba(255,255,255,0.04);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
}

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

.prose-content th,
.prose-content td {
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.6rem 0.9rem;
  text-align: left;
}

.prose-content th {
  background: rgba(255,255,255,0.08);
  font-weight: 700;
}

/* =============================================
   带侧边栏布局
   ============================================= */
.content-with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
}

.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 2rem);
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.content-aside h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}

.content-aside h3 > span {
  display: inline;
}

.content-aside nav ul li {
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.content-aside nav ul li:last-child {
  border-bottom: none;
}

.content-aside nav ul li a {
  display: block;
  padding: 0.6rem 0;
  font-size: 0.88rem;
  color: var(--gray-400);
  transition: color 0.2s;
  min-height: 40px;
  line-height: 1.4;
  display: flex;
  align-items: center;
}

.content-aside nav ul li a:hover {
  color: var(--white);
}

.aside-nav-extra {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.aside-nav-extra a {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: opacity 0.2s;
}

.aside-nav-extra a:hover {
  opacity: 0.8;
}

/* =============================================
   卡片网格（描边无阴影，圆角18px）
   ============================================= */
.listing-section {
  padding: 4rem 0;
  border-top: 2px solid rgba(255,255,255,0.1);
}

.listing-inner {
  width: 100%;
}

.listing-inner > h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--white);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.listing-inner > h2 > span {
  display: inline;
}

.tag-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
  background: var(--accent);
  padding: 0.2em 0.6em;
  border-radius: 4px;
}

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

.block-card {
  display: block;
  border: 2px solid var(--white);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: background 0.2s, transform 0.2s;
  background: transparent;
}

.block-card:hover {
  background: var(--white);
  transform: translateY(-2px);
}

.block-card:hover strong,
.block-card:hover .card-desc {
  color: var(--black);
}

.block-card:hover .card-num {
  color: rgba(0,0,0,0.15);
}

.block-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}

.block-card .card-num {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(255,255,255,0.08);
  letter-spacing: -0.05em;
  line-height: 1;
  transition: color 0.2s;
}

.block-card .card-desc {
  display: block;
  font-size: 0.85rem;
  color: var(--gray-400);
  line-height: 1.5;
  margin-top: 0.5rem;
  transition: color 0.2s;
}

/* =============================================
   对比页特殊区块
   ============================================= */
.compare-split-section {
  padding: 2rem 0 0;
}

.compare-labels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border: 2px solid var(--white);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.compare-label-a,
.compare-label-b {
  padding: 1.5rem 2rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.compare-label-a {
  background: var(--white);
  color: var(--black);
}

.compare-label-b {
  background: var(--black);
  color: var(--white);
  border-left: 2px solid var(--white);
}

.compare-label-a span,
.compare-label-b span {
  display: inline;
}

/* =============================================
   测评页图片
   ============================================= */
.review-img-section {
  padding: 2rem 0;
}

.review-img-section section {
  max-width: var(--max-prose);
}

.review-hero-img {
  width: 100%;
  border-radius: var(--radius-card);
  border: 2px solid rgba(255,255,255,0.2);
}

/* =============================================
   关于页 logo
   ============================================= */
.about-logo-section {
  padding: 2rem 0 0;
}

.about-logo-wrap {
  max-width: 200px;
}

.about-logo {
  border-radius: 12px;
}

/* =============================================
   FAQ 样式强化
   ============================================= */
.faq-content :is(h2, h3) {
  margin-top: 2rem;
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  border-top: 2px solid var(--white);
  margin-top: auto;
}

.footer-cta {
  background: var(--white);
  color: var(--black);
  padding: 4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-cta p {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-cta p span:first-child {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--black);
  line-height: 1.1;
}

.cta-sub {
  font-size: 1rem;
  color: rgba(0,0,0,0.55);
  font-weight: 500;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 1rem 2.5rem;
  border-radius: 100px;
  min-height: 48px;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}

.cta-btn:hover {
  background: var(--accent);
  color: var(--black);
  transform: translateY(-1px);
}

.footer-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  padding: 3rem 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--gray-400);
  line-height: 1.6;
  max-width: 320px;
}

.footer-links nav ul {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.footer-links nav ul li a {
  display: block;
  padding: 0.55rem 0;
  font-size: 0.88rem;
  color: var(--gray-400);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  min-height: 40px;
  line-height: 1.3;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.footer-links nav ul li:last-child a {
  border-bottom: none;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--gray-400);
}

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

.footer-legal a {
  font-size: 0.78rem;
  color: var(--gray-400);
  transition: color 0.2s;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

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

/* =============================================
   标题内 span 装饰（h2 > span, h3 > span）
   ============================================= */
h2 > span,
h3 > span {
  display: inline;
}

/* =============================================
   动效：轮播（纯CSS stagger）& prefers-reduced-motion
   ============================================= */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.block-card-grid .block-card {
  animation: fadeSlideUp 0.5s ease both;
}

.block-card-grid .block-card:nth-child(1) { animation-delay: 0.05s; }
.block-card-grid .block-card:nth-child(2) { animation-delay: 0.12s; }
.block-card-grid .block-card:nth-child(3) { animation-delay: 0.19s; }
.block-card-grid .block-card:nth-child(4) { animation-delay: 0.26s; }
.block-card-grid .block-card:nth-child(5) { animation-delay: 0.33s; }
.block-card-grid .block-card:nth-child(6) { animation-delay: 0.40s; }

.listing-inner,
.page-hero-inner {
  animation: fadeSlideUp 0.6s ease both;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =============================================
   响应式断点
   ============================================= */

/* 平板 */
@media (max-width: 1024px) {
  .content-with-aside {
    grid-template-columns: 1fr 240px;
    gap: 2.5rem;
  }
  .block-card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
  .footer-body {
    gap: 2rem;
  }
}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --header-h: 100px;
  }

  .wrap {
    padding: 0 1.25rem;
  }

  .header-brand-row {
    padding: 0.75rem 1.25rem 0.4rem;
  }

  .header-nav-row {
    padding: 0.4rem 1.25rem;
  }

  .top-nav-list li a {
    font-size: 0.76rem;
    padding: 0.6rem 0.65rem;
  }

  .hero-section {
    min-height: calc(100dvh - var(--header-h));
  }

  .hero-inner {
    padding: 4rem 1rem;
  }

  .hero-inner h1 {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

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

  .page-hero-inner h1 {
    font-size: clamp(1.7rem, 8vw, 2.8rem);
  }

  .content-with-aside {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .content-aside {
    position: static;
  }

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

  .block-card {
    padding: 1.25rem 1rem;
  }

  .block-card .card-num {
    font-size: 1.8rem;
  }

  .compare-labels {
    grid-template-columns: 1fr;
  }

  .compare-label-b {
    border-left: none;
    border-top: 2px solid var(--white);
  }

  .footer-cta {
    padding: 2.5rem 1.25rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-body {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 1.25rem;
  }

  .footer-bottom {
    padding: 1rem 1.25rem;
  }

  .listing-section {
    padding: 2.5rem 0;
  }

  .content-section {
    padding: 2.5rem 0;
  }
}

/* 超小屏 */
@media (max-width: 375px) {
  .block-card-grid {
    grid-template-columns: 1fr;
  }

  .top-nav-list li a {
    font-size: 0.72rem;
    padding: 0.6rem 0.5rem;
  }

  .hero-inner h1 {
    font-size: 2rem;
  }
}