/* ============================================================
   PDF转换批注助手 · 网页版首页样式 v2
   增强版：截图画廊 + 应用场景 + 对比表 + FAQ
   ============================================================ */
:root {
  --bg: #F7F7F5;
  --surface: #FFFFFF;
  --surface-2: #FBFBFA;
  --border: #ECECEA;
  --text: #37352F;
  --text-2: #6B6A66;
  --text-3: #9B9A97;
  --accent: #FF6B6B;
  --accent-hover: #F25252;
  --accent-soft: #FFECEC;
  --ok: #2FA372;
  --ok-soft: #E7F6EE;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 10px; font-size: 14px; font-weight: 600;
  text-decoration: none; transition: all .2s; cursor: pointer; border: 1.5px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(255,107,107,.3); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 14px 30px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-block { display: flex; justify-content: center; width: 100%; }

/* ========== 导航栏 ========== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; }
.brand-icon {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, #FF8A8A, var(--accent));
  color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 18px;
  box-shadow: 0 4px 12px rgba(255,107,107,.35);
}
.brand-name { font-size: 15px; letter-spacing: -.3px; }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-link { text-decoration: none; color: var(--text-2); font-size: 14px; font-weight: 500; transition: color .15s; white-space: nowrap; }
.nav-link:hover { color: var(--accent); }

/* ========== 语言切换按钮（精致胶囊风格） ========== */
.lang-toggle {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 12px; border-radius: 20px;
  background: rgba(255,255,255,.75); backdrop-filter: blur(8px);
  border: 1px solid var(--border); color: var(--text-2);
  font-size: 12.5px; font-weight: 600; cursor: pointer;
  transition: all .2s ease; letter-spacing: .2px;
}
.lang-toggle:hover {
  background: #fff; border-color: var(--accent); color: var(--accent);
  box-shadow: 0 2px 10px rgba(255,107,107,.15);
  transform: translateY(-1px);
}
.lang-toggle svg { opacity: .55; transition: opacity .2s; }
.lang-toggle:hover svg { opacity: 1; }
.lang-cur { color: var(--text); font-weight: 700; }
.lang-sep { color: var(--text-3); margin: 0 1px; font-weight: 400; }
.lang-alt { color: var(--text-3); font-weight: 500; }

/* 导航栏右侧区域 */
.nav-right { display: flex; align-items: center; gap: 10px; }

/* ========== Hero ========== */
.hero { padding: 100px 0 80px; overflow: hidden; }
.hero-badge {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  background: linear-gradient(135deg, #EDE9FE, #DDD6FE); color: #7C3AED;
  font-size: 13px; font-weight: 700; margin-bottom: 20px; letter-spacing: .3px;
}
.hero-title {
  font-size: clamp(32px, 4.2vw, 52px); font-weight: 800; line-height: 1.12;
  letter-spacing: -1.2px; margin-bottom: 20px;
}
.hero-title .accent { color: var(--accent); }
.hero-desc {
  font-size: 17px; color: var(--text-2); line-height: 1.75; margin-bottom: 32px;
  max-width: 600px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-cta { box-shadow: 0 4px 20px rgba(255,107,107,.35); }
.hero-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.hero-stats .stat strong { display: block; font-size: 24px; font-weight: 800; color: var(--text); }
.hero-stats .stat span { font-size: 12.5px; color: var(--text-3); }

/* ========== 截图展示画廊（核心新模块） ========== */
.showcase-section { background: var(--surface); overflow: hidden; }
.showcase-gallery {
  position: relative; max-width: 1100px; margin: 0 auto 48px;
}

.gallery-track {
  position: relative; width: 100%; aspect-ratio: 16/10;
  border-radius: 16px; overflow: hidden;
  box-shadow:
    0 25px 60px rgba(15,15,15,.12),
    0 8px 20px rgba(15,15,15,.06);
}

.gallery-slide {
  position: absolute; inset: 0; opacity: 0;
  transition: opacity .5s ease, transform .5s ease;
  transform: scale(1.02);
}
.gallery-slide.active {
  opacity: 1; transform: scale(1); z-index: 2;
}

.slide-frame {
  width: 100%; height: 100%;
  background: #1a1a1a; border-radius: 16px;
  display: grid; place-items: center; overflow: hidden;
}
.slide-frame img {
  max-width: 100%; max-height: 100%; object-fit: contain;
  border-radius: 16px;
}

/* 轮播按钮 */
.gallery-prev,
.gallery-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  z-index: 10; width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
  border: 1px solid var(--border); color: var(--text);
  font-size: 18px; cursor: pointer;
  display: grid; place-items: center;
  transition: all .2s; box-shadow: 0 2px 12px rgba(0,0,0,.08);
}
.gallery-prev { left: -18px; }
.gallery-next { right: -18px; }
.gallery-prev:hover,
.gallery-next:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-50%) scale(1.08); }

/* 缩略图导航 */
.gallery-thumbs {
  display: flex; justify-content: center; gap: 10px; margin-top: 20px;
}
.thumb {
  width: 80px; height: 50px; border-radius: 8px; overflow: hidden;
  border: 2px solid transparent; cursor: pointer;
  background: none; padding: 0; transition: all .2s; opacity: .55;
}
.thumb.active,
.thumb:hover { border-color: var(--accent); opacity: 1; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255,107,107,.2); }
.thumb img { width: 100%; height: 100%; object-fit: cover; }

/* 当前描述 */
.gallery-caption {
  text-align: center; margin-top: 28px; padding: 24px 32px;
  background: var(--bg); border-radius: 14px;
  border: 1px solid var(--border);
  min-height: 90px; display: flex; flex-direction: column; justify-content: center;
  transition: opacity .3s;
}
.gallery-caption h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.gallery-caption p { font-size: 14.5px; color: var(--text-2); line-height: 1.6; max-width: 650px; margin: 0 auto; }

/* 截图说明卡片 — 文字在图片上方悬浮 */
.slide-frame {
  width: 100%; height: 100%;
  background: #1a1a1a; border-radius: 16px;
  display: grid; place-items: center; overflow: hidden;
  position: relative;
}
.slide-frame img {
  max-width: 100%; max-height: 100%; object-fit: contain;
  border-radius: 16px;
}

/* 截图文字覆盖层 - 放在图片上方，更醒目 */
.slide-overlay {
  position: absolute; top: 0; left: 0; right: 0;
  padding: 22px 24px 46px;
  background: linear-gradient(0deg, transparent 0%, rgba(17,24,39,.74) 55%, rgba(17,24,39,.92) 100%);
  border-radius: 16px 16px 0 0;
  color: #fff; z-index: 3;
  transform: translateY(0);
  transition: transform .3s ease, opacity .3s ease;
  text-shadow: 0 1px 6px rgba(0,0,0,.35);
}
.gallery-slide:hover .slide-overlay {
  transform: translateY(-4px);
}
.slide-badge {
  display: inline-block; padding: 3px 10px; border-radius: 12px;
  background: var(--accent); color: #fff;
  font-size: 11px; font-weight: 700; margin-bottom: 8px;
  letter-spacing: .3px;
}
.slide-overlay h3 {
  font-size: 22px; font-weight: 800; margin-bottom: 8px;
  line-height: 1.3; letter-spacing: -.2px;
}
.slide-overlay p {
  font-size: 15px; opacity: .92; line-height: 1.6;
  /* 移除截断，允许展示完整描述文字 */
  display: block; overflow: visible;
}

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.mobile-menu-btn span { width: 22px; height: 2px; background: var(--text); border-radius: 1px; transition: .2s; }
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px;
}
.caption-card {
  padding: 24px 20px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--border);
  text-align: center; cursor: pointer; transition: all .25s;
}
.caption-card:hover {
  transform: translateY(-4px); box-shadow: 0 10px 28px rgba(15,15,15,.07);
  border-color: var(--accent);
}
.cc-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: grid; place-items: center; margin: 0 auto 12px;
  font-size: 22px; box-shadow: 0 4px 12px rgba(0,0,0,.1);
}
.caption-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.caption-card p { font-size: 13px; color: var(--text-3); line-height: 1.5; }

/* ========== 应用场景（SEO 内容深度） ========== */
.usecases-section { }
.usecase-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.usecase-card {
  padding: 36px 32px; border-radius: 18px;
  background: var(--surface); border: 1px solid var(--border);
  position: relative; transition: all .25s;
}
.usecase-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(15,15,15,.07);
  border-color: transparent;
}
.uc-badge {
  position: absolute; top: -10px; left: 28px;
  padding: 3px 14px; border-radius: 20px;
  background: var(--accent); color: #fff; font-size: 11.5px; font-weight: 700;
}
.uc-icon { font-size: 36px; margin-bottom: 14px; }
.usecase-card h3 { font-size: 19px; font-weight: 800; margin-bottom: 12px; letter-spacing: -.3px; }
.usecase-card p {
  font-size: 14.5px; color: var(--text-2); line-height: 1.72; margin-bottom: 16px;
}
.uc-tags {
  display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin-bottom: 18px;
}
.uc-tags li {
  padding: 4px 12px; border-radius: 6px; background: var(--bg);
  font-size: 12.5px; color: var(--text-2); font-weight: 500;
}
.uc-link {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 14px; font-weight: 700; color: var(--accent);
  text-decoration: none; transition: gap .2s;
}
.uc-link:hover { gap: 8px; }

/* 圆形数据徽章 */
.usecase-badges {
  grid-column: 1 / -1;
  display: flex; justify-content: center; gap: 48px;
  padding: 40px 20px; margin-top: 12px;
  background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
  border-radius: 18px;
}
.ub-item { text-align: center; }
.ub-num {
  font-size: 36px; font-weight: 800; color: var(--accent);
  line-height: 1.1; margin-bottom: 4px;
}
.ub-label { font-size: 13px; color: var(--text-2); font-weight: 500; }

/* ========== 对比表格 ========== */
.comparison-section { background: var(--surface); }
.comparison-table-wrapper {
  overflow-x: auto; border-radius: 16px;
  box-shadow: 0 4px 20px rgba(15,15,15,.05);
}
.comparison-table {
  width: 100%; border-collapse: collapse; min-width: 550px;
  font-size: 14px;
}
.comparison-table th,
.comparison-table td {
  padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--border);
}
.comparison-table thead th {
  background: var(--bg); font-weight: 700; font-size: 13px;
  text-transform: uppercase; letter-spacing: .5px; color: var(--text-2);
}
.th-us { color: var(--accent) !important; }
.td-good { color: var(--ok); font-weight: 600; }
.comparison-table tbody tr:hover { background: var(--surface-2); }
.comparison-table tbody tr:last-child td { border-bottom: none; }

/* ========== 工具网格 ========== */
.tools-section { background: var(--surface); }
.section-title {
  text-align: center; font-size: clamp(26px, 3vw, 36px); font-weight: 800;
  letter-spacing: -.5px; margin-bottom: 10px;
}
.section-subtitle {
  text-align: center; color: var(--text-3); font-size: 16px; margin-bottom: 48px;
}
.tools-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px;
}
.tool-card {
  display: block; padding: 28px 24px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 14px;
  text-decoration: none; color: inherit; transition: all .25s;
  position: relative;
}
.tool-card:hover {
  transform: translateY(-4px); box-shadow: 0 12px 32px rgba(15,15,15,.07);
  border-color: var(--accent); color: var(--accent);
}
.tool-icon {
  width: 54px; height: 54px; border-radius: 14px;
  display: grid; place-items: center; margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}
.tool-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.tool-card p { font-size: 13.5px; color: var(--text-3); line-height: 1.55; }
.tool-tag {
  position: absolute; top: 20px; right: 20px;
  padding: 3px 10px; border-radius: 6px; font-size: 11px; font-weight: 600;
}
.tool-tag-free    { background: var(--ok-soft); color: var(--ok); }
.tool-tag-pro     { background: #FFF4E5; color: #D97706; }
.tool-tag-freetrial { background: #EDE9FE; color: #7C3AED; }
.tool-tag-coming  { background: #F3F4F6; color: #9CA3AF; }
.tool-card-coming { opacity: .72; }
.tool-card-coming:hover { opacity: 1; }

/* ========== 功能特点 ========== */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px; margin-top: 48px;
}
.feature-item { padding: 32px 28px; position: relative; }
.feature-icon { font-size: 36px; margin-bottom: 16px; }
.feature-item h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--text-2); line-height: 1.65; }

/* 高亮卡片：悬停发光 + 独占标签 */
.highlight-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; overflow: hidden;
  transition: all .3s ease;
  box-shadow: 0 1px 3px rgba(15,15,15,.04);
}
.highlight-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(15,15,15,.10);
  border-color: var(--accent);
}
.feature-glow {
  position: absolute; top: -40px; right: -40px;
  width: 160px; height: 160px; border-radius: 50%;
  filter: blur(48px); pointer-events: none;
}
.feat-badge {
  position: absolute; top: 16px; right: 16px;
  padding: 3px 12px; border-radius: 20px;
  font-size: 11px; font-weight: 700; letter-spacing: .3px;
}
.feat-badge[data-i18n*="exclusive"],
.feat-badge:not([data-i18n*="free"]) {
  background: linear-gradient(135deg,#7C3AED,#A78BFA); color:#fff;
}
.feat-badge[data-i18n*="free"] {
  background: var(--ok-soft); color: var(--ok);
}
.feat-tags {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px;
}
.feat-tags span {
  padding: 4px 10px; border-radius: 6px;
  background: var(--bg); font-size: 12px;
  color: var(--text-2); font-weight: 500;
}

/* ========== 价格 ========== */
.pricing-section { background: var(--surface); }
.pricing-grid {
  display: grid; grid-template-columns: repeat(2, 340px); gap: 24px;
  justify-content: center; margin-top: 48px;
}
.pricing-card {
  padding: 36px 30px; border-radius: 16px;
  border: 1.5px solid var(--border); background: var(--bg);
  position: relative;
}
.pricing-card.featured {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(255,107,107,.12);
  transform: scale(1.03);
}
.badge-hot {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; padding: 4px 18px; border-radius: 20px;
  font-size: 12px; font-weight: 700;
}
.pricing-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 16px; }
.price { margin-bottom: 24px; }
.price .currency { font-size: 22px; font-weight: 700; vertical-align: super; }
.price .amount { font-size: 44px; font-weight: 800; }
.price .period { font-size: 15px; color: var(--text-3); }
.pricing-features { list-style: none; margin-bottom: 28px; }
.pricing-features li {
  padding: 7px 0; font-size: 14px; color: var(--text-2);
  border-bottom: 1px solid var(--border);
}
.pricing-features li:last-child { border-bottom: none; }
.pricing-note { text-align: center; margin-top: 24px; font-size: 13px; color: var(--text-3); }
.pricing-note a { color: var(--accent); }

/* ========== FAQ ========== */
.faq-section { background: var(--bg); }
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  border: 1px solid var(--border); border-radius: 12px;
  margin-bottom: 12px; background: var(--surface);
  overflow: hidden; transition: box-shadow .2s;
}
.faq-item:hover { box-shadow: 0 2px 12px rgba(0,0,0,.04); }
.faq-item[open] { border-color: var(--accent); }

.faq-item summary {
  padding: 20px 24px; cursor: pointer; font-weight: 700;
  font-size: 15.5px; list-style: none; display: flex; align-items: center; gap: 12px;
  transition: color .15s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; margin-left: auto; font-size: 20px; font-weight: 300;
  color: var(--text-3); transition: transform .2s;
}
.faq-item[open] summary::after { content: '−'; transform: scale(1.1); }
.faq-item summary:hover { color: var(--accent); }

.q-icon {
  min-width: 28px; height: 28px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-size: 13px; font-weight: 800;
}

.faq-answer {
  padding: 0 24px 20px 64px; font-size: 14.5px; color: var(--text-2); line-height: 1.72;
}
.faq-answer p { margin-bottom: 10px; }
.faq-answer ul, .faq-answer ol { margin: 8px 0 12px 18px; }
.faq-answer li { margin-bottom: 4px; }
.faq-answer a { color: var(--accent); text-decoration: none; }
.faq-answer a:hover { text-decoration: underline; }

/* ========== CTA ========== */
.cta-section { padding: 100px 0; }
.cta-box {
  text-align: center; padding: 64px 40px;
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
  border-radius: 20px; color: #fff;
}
.cta-box h2 { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.cta-box p { font-size: 17px; opacity: .9; margin-bottom: 28px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-btn-white { background: #fff; color: var(--accent); border-color: #fff; }
.cta-btn-white:hover { background: rgba(255,255,255,.9); }

/* ========== 页脚 ========== */
.footer { background: var(--text); color: #ccc; padding: 56px 0 24px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 40px;
}
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 16px; font-weight: 700; }
.footer-col p { font-size: 13.5px; line-height: 1.6; opacity: .75; }
.footer-col a {
  display: block; font-size: 13.5px; color: #999; text-decoration: none;
  padding: 5px 0; transition: color .15s;
}
.footer-col a:hover { color: #fff; }
.footer-social { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; }
.footer-social span { font-size: 12.5px; opacity: .6; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 20px; text-align: center; font-size: 12.5px; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .caption-cards { grid-template-columns: repeat(2, 1fr); }
  .usecase-badges { gap: 28px; flex-wrap: wrap; }
  .gallery-prev { left: 4px; }
  .gallery-next { right: 4px; }
}

@media (max-width: 900px) {
  .hero { padding: 70px 0 56px; }
  .hero-desc { max-width: 100%; margin: 0 auto 28px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
  .pricing-card.featured { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }

  /* 移动端导航 */
  .nav-links { display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: rgba(255,255,255,.97); backdrop-filter: blur(12px);
    flex-direction: column; padding: 20px 24px; gap: 16px;
    border-bottom: 1px solid var(--border); box-shadow: 0 8px 24px rgba(0,0,0,.08);
    z-index: 99; }
  .nav-links.open { display: flex; }
  .mobile-menu-btn { display: flex; }
  .nav-links.open ~ .mobile-menu-btn span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-links.open ~ .mobile-menu-btn span:nth-child(2) { opacity: 0; }
  .nav-links.open ~ .mobile-menu-btn span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  /* 缩略图在移动端更小 */
  .gallery-thumbs { gap: 6px; }
  .thumb { width: 56px; height: 36px; }
}

@media (max-width: 720px) {
  .usecase-grid { grid-template-columns: 1fr; }
  .caption-cards { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .hero { padding: 56px 0 40px; }
  .hero-stats { gap: 24px; }
  .gallery-track { aspect-ratio: 4/3; }
  .faq-answer { padding-left: 20px; padding-right: 16px; }
  .cta-actions { flex-direction: column; align-items: center; }
  .usecase-badges { gap: 20px; }
  .ub-num { font-size: 28px; }
}

/* ============================================================
   视觉升级：扁平化 · 高大上 · 微交互
   ============================================================ */

/* 主按钮：渐变 + 柔和投影 + 悬停上浮 */
.btn-primary {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
  border-color: transparent; color: #fff;
  box-shadow: 0 6px 18px rgba(255,107,107,.28);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #FF5A5A, #FF7E3D);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(255,107,107,.38);
}
/* 幽灵按钮（次级） */
.btn-ghost {
  background: rgba(255,255,255,.7);
  color: var(--text); border-color: var(--border);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: #fff; transform: translateY(-1px); }

/* ===== Hero：渐变底 + 浮动色块 ===== */
.hero {
  position: relative; overflow: hidden;
  padding: 110px 0 90px;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(255,142,83,.12), transparent 60%),
    radial-gradient(800px 480px at 5% 10%, rgba(124,58,237,.08), transparent 55%),
    linear-gradient(180deg, #FFFFFF 0%, #FFF8F5 100%);
}
.hero-bg-shapes { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.shape {
  position: absolute; border-radius: 50%;
  filter: blur(8px); opacity: .55;
  animation: floatShape 14s ease-in-out infinite;
}
.shape-1 { width: 320px; height: 320px; top: -80px; right: 6%;
  background: radial-gradient(circle at 40% 40%, #FFD0B8, #FF8E53); }
.shape-2 { width: 240px; height: 240px; top: 30%; left: -60px;
  background: radial-gradient(circle at 40% 40%, #D9C8FF, #A78BFA); animation-delay: 3s; }
.shape-3 { width: 180px; height: 180px; bottom: -40px; left: 38%;
  background: radial-gradient(circle at 40% 40%, #FFC2C2, #FF6B6B); opacity: .4; animation-delay: 6s; }
@keyframes floatShape {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(18px,-22px) scale(1.06); }
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 720px; }
.hero-title {
  background: linear-gradient(180deg, #2B2A27, #4A4843);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-title .accent {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-cta { box-shadow: 0 8px 24px rgba(255,107,107,.4); }

/* ===== 区块标题：小装饰下划线 ===== */
.section-title { position: relative; padding-bottom: 14px; }
.section-title::after {
  content: ''; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 56px; height: 4px; border-radius: 4px;
  background: linear-gradient(90deg, #FF6B6B, #FF8E53);
}
.section-subtitle { color: var(--text-2); }

/* ===== 卡片微交互：柔和阴影 + 悬浮上浮 ===== */
.tool-card {
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(15,15,15,.04);
}
.tool-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(15,15,15,.10);
  border-color: var(--accent); color: var(--accent);
}
.tool-icon { background: linear-gradient(135deg, #FFE3D6, #FFD0B8); }
.usecase-card {
  box-shadow: 0 1px 3px rgba(15,15,15,.05);
}
.usecase-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 44px rgba(15,15,15,.10);
  border-color: transparent;
  background: linear-gradient(180deg, #fff, #FFF9F6);
}
.caption-card {
  box-shadow: 0 1px 3px rgba(15,15,15,.05);
  transition: all .28s;
}
.caption-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 38px rgba(15,15,15,.10);
  border-color: var(--accent);
}
.uc-badge { box-shadow: 0 4px 12px rgba(255,107,107,.3); }

/* ===== 区块节奏：柔和交替底色 ===== */
.usecases-section { background: linear-gradient(180deg, #fff 0%, #FFF9F6 100%); }
.features-section, #features { background: linear-gradient(180deg, #FFF9F6 0%, #fff 100%); }
.comparison-section { background: var(--surface); }

/* ===== CTA：更丰富的渐变 + 光泽 ===== */
.cta-box {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 60%, #FFB347 100%);
  box-shadow: 0 24px 60px rgba(255,107,107,.30);
}
.cta-box::before {
  content: ''; position: absolute; top: -60%; right: -10%;
  width: 360px; height: 360px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.25), transparent 70%);
}
.cta-box h2, .cta-box p { position: relative; }

/* ===== 页脚微调 ===== */
.footer { background: #1F1E1B; }

/* ===== 响应式：缩小浮动块 ===== */
@media (max-width: 720px) {
  .shape-1 { width: 200px; height: 200px; }
  .shape-2 { width: 150px; height: 150px; }
  .shape-3 { width: 120px; height: 120px; }
  .hero { padding: 64px 0 44px; }
}