/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #3D7BE4;
  --primary-deep: #1E4E9E;
  --accent: #FFC15C;
  --success: #2FA08C;
  --bg-page: #F7FAFE;
  --bg-card: #FFFFFF;
  --bg-soft: #EAF1FA;
  --text-main: #14283F;
  --text-muted: #5A7188;
  --border: #DCE6F2;
  --shadow-card: 0 8px 28px rgba(21,72,153,0.08);
  --shadow-hover: 0 14px 40px rgba(21,72,153,0.14);
  --radius: 16px;
  --radius-btn: 10px;
  --radius-badge: 999px;
  --container: 1200px;
  --space-section: 100px;
  --space-section-md: 80px;
  --space-section-sm: 56px;
  --footer-bg: #0F2540;
  --transition: .25s ease;
}

/* ===== Reset / 基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:focus-visible { outline: 3px solid rgba(61,123,228,.4); outline-offset: 2px; border-radius: 4px; }
button, input, select, textarea { font-family: inherit; font-size: 100%; line-height: 1.5; border: none; outline: none; }
ul, ol { list-style: none; }
::selection { background: rgba(61,123,228,.15); color: var(--primary-deep); }

/* ===== 容器 ===== */
.container { max-width: var(--container); margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* ===== 排版辅助 ===== */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-badge);
  background: var(--bg-soft);
  color: var(--primary-deep);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  margin-bottom: 16px;
}
.section-tag::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}
.section-title { font-size: 34px; font-weight: 700; line-height: 1.3; color: var(--text-main); letter-spacing: -0.01em; }
.section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.8; margin-top: 12px; max-width: 640px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 28px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 3px solid rgba(61,123,228,.4); outline-offset: 2px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(61,123,228,.3); }
.btn-primary:hover { background: var(--primary-deep); box-shadow: 0 6px 22px rgba(30,78,158,.35); transform: translateY(-2px); color: #fff; }
.btn-secondary { background: var(--bg-card); color: var(--primary); border: 1px solid rgba(61,123,228,.4); }
.btn-secondary:hover { background: var(--bg-soft); transform: translateY(-2px); }
.btn-block { width: 100%; }
.btn-lg { padding: 17px 34px; font-size: 16px; }

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 72px;
  background: var(--bg-card);
  border-bottom: 1px solid rgba(220,230,242,.7);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 6px 20px rgba(21,72,153,.07); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 21px; color: var(--text-main); }
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  flex-shrink: 0;
}
.logo-mark svg { width: 17px; height: 17px; }
.header-cta { display: inline-flex; }
.cta-short { display: none; }

/* ===== Hero 首屏 ===== */
.hero {
  position: relative;
  padding: 140px 0 90px;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background: var(--bg-page);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(61,123,228,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,123,228,.045) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 64px;
  align-items: center;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: var(--radius-badge);
  background: rgba(255,193,92,.14);
  color: #8A6A1A;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 22px;
}
.hero-title { font-size: 46px; font-weight: 800; line-height: 1.25; letter-spacing: -0.01em; color: var(--text-main); }
.hero-title span { color: var(--primary); }
.hero-desc { font-size: 16px; line-height: 1.85; color: var(--text-muted); margin-top: 20px; max-width: 480px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 34px; }
.hero-points { display: flex; gap: 32px; margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--border); }
.hero-point { display: flex; flex-direction: column; }
.hero-point-num { font-size: 24px; font-weight: 800; color: var(--primary-deep); font-family: ui-monospace, "DIN Alternate", monospace; }
.hero-point-label { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* Hero 视觉 */
.hero-visual { position: relative; }
.video-card {
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
  z-index: 1;
}
.video-cover {
  position: relative;
  height: 300px;
  background: linear-gradient(140deg, #B9D4F5 0%, #EAF1FA 50%, #D5C8E8 100%);
  display: flex; align-items: center; justify-content: center;
}
.video-play {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: rgba(255,255,255,.9);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
  box-shadow: 0 6px 20px rgba(21,72,153,.18);
  transition: transform var(--transition);
  cursor: pointer;
}
.video-play:hover { transform: scale(1.08); }
.video-play svg { width: 24px; height: 24px; margin-left: 2px; }
.video-duration {
  position: absolute; bottom: 12px; right: 12px;
  background: rgba(20,40,63,.75);
  color: #fff;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 6px;
  font-family: ui-monospace, monospace;
}
.video-meta { padding: 18px 22px; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); }
.video-title { font-weight: 600; font-size: 15px; color: var(--text-main); }
.video-stats { font-size: 13px; color: var(--text-muted); }
.float-card {
  position: absolute;
  background: var(--bg-card);
  border-radius: 14px;
  box-shadow: var(--shadow-hover);
  padding: 16px 20px;
  border: 1px solid var(--border);
  z-index: 2;
  min-width: 140px;
}
.float-card .float-num { font-size: 26px; font-weight: 800; color: var(--primary); font-family: ui-monospace, "DIN Alternate", monospace; line-height: 1.2; }
.float-card .float-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.float-card-1 { top: 30px; left: -30px; }
.float-card-2 { bottom: 40px; right: -20px; }

/* ===== 通用区块间距 ===== */
.section { padding: var(--space-section) 0; }
.section-soft { background: var(--bg-soft); }

/* ===== 痛点区 ===== */
.pain-section { padding: var(--space-section) 0; }
.pain-header { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: end; margin-bottom: 48px; }
.pain-header .section-desc { margin-top: 0; }
.pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.pain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}
.pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.pain-card .icon-wrap {
  width: 50px; height: 50px;
  border-radius: 12px;
  background: rgba(255,193,92,.15);
  color: #B8881F;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.pain-card .icon-wrap svg { width: 24px; height: 24px; }
.pain-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.pain-card p { font-size: 15px; color: var(--text-muted); line-height: 1.8; }

/* ===== 解决方案区 ===== */
.solution-section { padding: var(--space-section) 0; background: var(--bg-page); }
.solution-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}
.solution-media {
  position: relative;
  background: linear-gradient(140deg, #D8E7FA 0%, #EAF1FA 60%, #F5EAD0 100%);
  display: flex; align-items: center; justify-content: center;
  min-height: 320px;
}
.solution-media .feature-ic { width: 72px; height: 72px; border-radius: 18px; background: rgba(255,255,255,.85); display: flex; align-items: center; justify-content: center; color: var(--primary); box-shadow: 0 8px 24px rgba(21,72,153,.12); }
.solution-media .feature-ic svg { width: 34px; height: 34px; }
.solution-content { padding: 48px; display: flex; flex-direction: column; justify-content: center; }
.solution-content .section-tag { margin-bottom: 12px; }
.solution-content h3 { font-size: 26px; font-weight: 700; line-height: 1.4; margin-bottom: 14px; }
.solution-content p { color: var(--text-muted); font-size: 15px; line-height: 1.85; }
.solution-points { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.solution-points li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: var(--text-main); }
.solution-points li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--success); margin-top: 8px; flex-shrink: 0; }

.solution-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}
.solution-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.solution-card .icon-wrap {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--bg-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.solution-card .icon-wrap svg { width: 22px; height: 22px; }
.solution-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.solution-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== 内容速览区 ===== */
.content-section { padding: var(--space-section) 0; background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.content-layout { display: grid; grid-template-columns: 1.3fr .7fr; gap: 56px; align-items: start; }
.content-list-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.content-list-head h3 { font-size: 22px; font-weight: 700; }
.content-list { display: flex; flex-direction: column; }
.content-item {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 18px 12px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), padding var(--transition);
}
.content-item:last-child { border-bottom: none; }
.content-item:hover { background: var(--bg-page); padding-left: 18px; padding-right: 18px; }
.content-cat {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-badge);
  background: var(--bg-soft);
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  width: fit-content;
}
.content-link { font-size: 15px; font-weight: 600; color: var(--text-main); display: block; }
.content-item:hover .content-link { color: var(--primary); }
.content-date { font-size: 13px; color: var(--text-muted); font-family: ui-monospace, monospace; }

.recommend-card {
  background: var(--bg-soft);
  border-radius: 20px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
}
.recommend-card::after {
  content: '';
  position: absolute;
  bottom: -40px; right: -40px;
  width: 140px; height: 140px;
  border-radius: 50%;
  background: rgba(61,123,228,.08);
}
.recommend-tag { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .06em; }
.recommend-card h4 { font-size: 20px; font-weight: 700; margin: 14px 0 10px; line-height: 1.4; }
.recommend-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.recommend-link { font-size: 14px; font-weight: 600; color: var(--primary-deep); display: inline-flex; align-items: center; gap: 6px; }
.recommend-link:hover { color: var(--primary); }
.recommend-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.recommend-link:hover svg { transform: translateX(4px); }

/* ===== 成果数据区 ===== */
.stats-band { padding: var(--space-section) 0; background: var(--bg-soft); }
.stats-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.stats-head .section-desc { margin-left: auto; margin-right: auto; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat-item { text-align: center; padding: 8px; }
.stat-num {
  font-size: 58px;
  font-weight: 800;
  color: var(--primary);
  font-family: ui-monospace, "DIN Alternate", monospace;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.stat-unit { font-size: 18px; font-weight: 600; color: var(--primary-deep); margin-left: 2px; }
.stat-label { font-size: 14px; color: var(--text-muted); margin-top: 10px; }
.timeline {
  margin-top: 64px;
  position: relative;
  display: flex;
  justify-content: space-between;
  padding-top: 20px;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 8px; left: 20px; right: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), rgba(61,123,228,.2));
  border-radius: 2px;
}
.timeline-item { text-align: center; position: relative; flex: 1; padding: 0 8px; }
.timeline-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-soft);
  box-shadow: 0 0 0 2px var(--primary);
  margin: 0 auto 12px;
  position: relative;
  z-index: 1;
}
.timeline-year { font-size: 15px; font-weight: 700; color: var(--text-main); }
.timeline-text { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ===== 客户证言区 ===== */
.testimonial-section { padding: var(--space-section) 0; }
.testimonial-wrap { display: grid; grid-template-columns: .8fr 1.2fr; gap: 64px; align-items: center; }
.testimonial-lead { position: relative; }
.testimonial-lead .big-quote { font-size: 72px; font-weight: 800; color: var(--primary); opacity: .2; line-height: 0; display: block; }
.testimonial-lead h3 { font-size: 28px; font-weight: 700; line-height: 1.45; margin: 20px 0 16px; }
.testimonial-lead p { color: var(--text-muted); font-size: 15px; }
.testimonial-cards { display: flex; flex-direction: column; gap: 24px; }
.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-card);
  border-top: 3px solid var(--primary);
  transition: transform var(--transition), box-shadow var(--transition);
}
.testimonial-card:nth-child(2) { margin-left: 48px; }
.testimonial-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.testimonial-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.testimonial-avatar {
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-deep);
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
  border: 2px solid rgba(61,123,228,.15);
}
.testimonial-name { font-weight: 700; font-size: 15px; }
.testimonial-role { font-size: 13px; color: var(--text-muted); }
.testimonial-card blockquote { font-size: 14.5px; color: var(--text-main); line-height: 1.8; font-style: normal; }

/* ===== FAQ 区 ===== */
.faq-section { padding: var(--space-section) 0; background: var(--bg-card); border-top: 1px solid var(--border); }
.faq-wrap { display: grid; grid-template-columns: .7fr 1.3fr; gap: 64px; align-items: start; }
.faq-head .section-desc { margin-top: 14px; }
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item.active { border-color: rgba(61,123,228,.5); box-shadow: var(--shadow-card); }
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 20px 24px;
  background: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--text-main);
  text-align: left;
  transition: color var(--transition);
}
.faq-q:hover { color: var(--primary); }
.faq-q:focus-visible { outline: 3px solid rgba(61,123,228,.35); border-radius: 10px; }
.faq-icon { width: 20px; height: 20px; flex-shrink: 0; color: var(--text-muted); transition: transform .35s ease, color var(--transition); }
.faq-item.active .faq-icon { transform: rotate(180deg); color: var(--primary); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.faq-item.active .faq-a { max-height: 300px; }
.faq-a-inner { padding: 0 24px 22px; color: var(--text-muted); font-size: 14.5px; line-height: 1.85; }

/* ===== CTA / 表单区 ===== */
.cta-section { padding: var(--space-section) 0; background: var(--primary); position: relative; overflow: hidden; }
.cta-section::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.cta-inner { position: relative; text-align: center; color: #fff; }
.cta-inner h2 { font-size: 34px; font-weight: 800; line-height: 1.4; letter-spacing: -0.01em; }
.cta-inner .cta-sub { font-size: 16px; color: rgba(255,255,255,.85); max-width: 560px; margin: 16px auto 0; line-height: 1.8; }
.cta-card {
  background: var(--bg-card);
  border-radius: 22px;
  padding: 44px;
  max-width: 720px;
  margin: 48px auto 0;
  text-align: left;
  box-shadow: 0 20px 50px rgba(21,50,110,.25);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-main); margin-bottom: 8px; letter-spacing: .02em; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14.5px;
  color: var(--text-main);
  background: var(--bg-page);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.form-group input { height: 46px; }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-group input::placeholder,
.form-group textarea::placeholder { color: #A0B4C8; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(61,123,228,.12);
  background: #fff;
}
.form-group select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%235A7188' stroke-width='2' viewBox='0 0 24 24'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; }
.form-submit { margin-top: 8px; }
.form-privacy { font-size: 12.5px; color: var(--text-muted); text-align: center; margin-top: 14px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--footer-bg); color: #A7B8CC; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.5fr; gap: 48px; padding-bottom: 48px; }
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand .logo-mark { background: rgba(255,255,255,.12); }
.footer-brand p { font-size: 14px; line-height: 1.8; color: #8FA3BC; max-width: 340px; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #8FA3BC; font-size: 14px; transition: color var(--transition); }
.footer-col ul li a:hover { color: #fff; }
.footer-col ul li a:focus-visible { outline-color: rgba(255,255,255,.5); }
.footer-contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: #8FA3BC; line-height: 1.7; }
.footer-contact li svg { width: 17px; height: 17px; margin-top: 3px; flex-shrink: 0; color: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 22px 0;
  text-align: center;
  font-size: 13px;
  color: #7189A3;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero { padding: 120px 0 70px; }
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual { max-width: 560px; margin: 0 auto; width: 100%; }
  .float-card-1 { left: -8px; }
  .float-card-2 { right: -8px; }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .content-layout { grid-template-columns: 1fr; gap: 40px; }
  .testimonial-wrap { grid-template-columns: 1fr; gap: 40px; }
  .faq-wrap { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .section { --space-section: var(--space-section-md); }
  .section-title { font-size: 28px; }
  .pain-header { grid-template-columns: 1fr; gap: 20px; }
  .pain-grid { grid-template-columns: 1fr; }
  .solution-feature { grid-template-columns: 1fr; }
  .solution-media { min-height: 220px; }
  .solution-content { padding: 32px 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .stat-num { font-size: 42px; }
  .timeline { flex-wrap: wrap; gap: 28px; justify-content: flex-start; }
  .timeline::before { display: none; }
  .timeline-item { flex: 0 0 33%; text-align: left; }
  .timeline-dot { margin-left: 0; }
  .testimonial-card:nth-child(2) { margin-left: 0; }
  .form-row { grid-template-columns: 1fr; }
  .cta-card { padding: 30px 26px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  body { font-size: 15px; }
  .hero { padding: 100px 0 56px; }
  .hero-title { font-size: 32px; }
  .hero-desc { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-points { flex-wrap: wrap; gap: 20px; }
  .video-cover { height: 220px; }
  .float-card { min-width: 110px; padding: 12px 16px; }
  .float-card .float-num { font-size: 20px; }
  .solution-grid { grid-template-columns: 1fr; }
  .content-item { grid-template-columns: 70px 1fr; gap: 14px; }
  .content-date { display: none; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .stat-num { font-size: 34px; }
  .timeline-item { flex: 0 0 50%; }
  .cta-inner h2 { font-size: 26px; }
  .form-row { grid-template-columns: 1fr; }
  .cta-card { padding: 24px 18px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 400px) {
  .cta-long { display: none; }
  .cta-short { display: inline; }
  .hero-actions .btn { padding: 15px 20px; }
  .stats-grid { grid-template-columns: 1fr; }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
  --primary: #3D7BE4;
  --primary-deep: #1E4E9E;
  --accent: #FFC15C;
  --success: #2FA08C;
  --bg-page: #F7FAFE;
  --bg-card: #FFFFFF;
  --bg-soft: #EAF1FA;
  --text-main: #14283F;
  --text-muted: #5A7188;
  --border: #DCE6F2;
  --shadow-card: 0 8px 28px rgba(21,72,153,0.08);
  --shadow-hover: 0 14px 40px rgba(21,72,153,0.14);
  --radius: 16px;
  --radius-btn: 10px;
  --radius-badge: 999px;
  --container: 1200px;
  --space-section: 100px;
  --space-section-md: 80px;
  --space-section-sm: 56px;
  --footer-bg: #0F2540;
  --transition: .25s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  margin: 0;
}
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:focus-visible { outline: 3px solid rgba(61,123,228,.4); outline-offset: 2px; border-radius: 4px; }
button, input, select, textarea { font-family: inherit; font-size: 100%; line-height: 1.5; border: none; outline: none; }
.container { max-width: var(--container); margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* ===== 排版辅助 ===== */
.section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: var(--radius-badge);
  background: var(--bg-soft); color: var(--primary-deep);
  font-size: 13px; font-weight: 600; letter-spacing: .02em; margin-bottom: 16px;
}
.section-tag::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary); flex-shrink: 0;
}
.section-title { font-size: 34px; font-weight: 700; line-height: 1.3; color: var(--text-main); letter-spacing: -0.01em; }
.section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.8; margin-top: 12px; max-width: 640px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 15px 28px; border-radius: var(--radius-btn); font-weight: 600;
  font-size: 15px; line-height: 1; cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 3px solid rgba(61,123,228,.4); outline-offset: 2px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(61,123,228,.3); }
.btn-primary:hover { background: var(--primary-deep); box-shadow: 0 6px 22px rgba(30,78,158,.35); transform: translateY(-2px); color: #fff; }
.btn-secondary { background: var(--bg-card); color: var(--primary); border: 1px solid rgba(61,123,228,.4); }
.btn-secondary:hover { background: var(--bg-soft); transform: translateY(-2px); }
.btn-lg { padding: 17px 34px; font-size: 16px; }

/* ===== 导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; height: 72px;
  background: var(--bg-card); border-bottom: 1px solid rgba(220,230,242,.7);
  z-index: 1000; transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 6px 20px rgba(21,72,153,.07); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 21px; color: var(--text-main); }
.logo-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  display: flex; align-items: center; justify-content: center; color: #fff; flex-shrink: 0;
}
.logo-mark svg { width: 17px; height: 17px; }
.header-cta { display: inline-flex; }
.cta-short { display: none; }

/* ===== 页面标题区 ===== */
.page-hero {
  position: relative; padding: 140px 0 64px;
  background: var(--bg-page); overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(61,123,228,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,123,228,.04) 1px, transparent 1px);
  background-size: 34px 34px; pointer-events: none;
}
.page-hero-inner { position: relative; }
.breadcrumb {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 13px; color: var(--text-muted); margin-bottom: 20px;
}
.breadcrumb a { color: var(--primary-deep); font-weight: 500; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { color: var(--border); }
.page-hero-title { font-size: 44px; font-weight: 800; line-height: 1.25; letter-spacing: -0.01em; color: var(--text-main); max-width: 720px; }
.page-hero-title span { color: var(--primary); }
.page-hero-desc { font-size: 16px; line-height: 1.85; color: var(--text-muted); max-width: 660px; margin-top: 18px; }
.page-hero-stats { display: flex; gap: 40px; margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); flex-wrap: wrap; }
.page-hero-stat .num { font-size: 26px; font-weight: 800; color: var(--primary-deep); font-family: ui-monospace, "DIN Alternate", monospace; line-height: 1.2; }
.page-hero-stat .label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ===== 内容精选网格 ===== */
.section-content { padding: 72px 0 60px; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 40px; flex-wrap: wrap; }
.section-head .section-title { font-size: 30px; }
.section-head-link { color: var(--primary-deep); font-weight: 600; font-size: 14px; }
.section-head-link:hover { color: var(--primary); }
.content-grid { display: flex; flex-direction: column; gap: 32px; }

/* 第一行：横向大卡 */
.grid-row-1 { display: grid; grid-template-columns: 1fr; }
.content-card {
  background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: var(--shadow-card); overflow: hidden; transition: all var(--transition);
  display: flex; flex-direction: column;
}
.content-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.content-card-cover { position: relative; overflow: hidden; aspect-ratio: 21/9; }
.content-card-cover.ratio-16x9 { aspect-ratio: 16/9; }
.content-card-cover.ratio-4x3 { aspect-ratio: 4/3; }
.content-card-cover .cover-bg { position: absolute; inset: 0; }
.content-card-cover .play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 56px; height: 56px; border-radius: 50%; background: rgba(255,255,255,.92);
  display: flex; align-items: center; justify-content: center; color: var(--primary);
  box-shadow: 0 6px 20px rgba(21,72,153,.2); transition: all var(--transition);
}
.content-card:hover .play-btn { transform: translate(-50%,-50%) scale(1.08); }
.play-btn svg { width: 22px; height: 22px; margin-left: 2px; }
.content-card-body { padding: 24px 26px; display: flex; flex-direction: column; flex: 1; }
.card-badge {
  display: inline-flex; align-items: center; padding: 4px 12px;
  border-radius: var(--radius-badge); background: var(--bg-soft); color: var(--primary-deep);
  font-size: 12px; font-weight: 600; align-self: flex-start; margin-bottom: 12px;
}
.content-card-title { font-size: 20px; font-weight: 700; line-height: 1.45; color: var(--text-main); }
.content-card-desc { font-size: 14px; line-height: 1.7; color: var(--text-muted); margin-top: 10px; }
.card-meta { display: flex; gap: 18px; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--border); margin-top: 16px; }
.card-meta-item { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-muted); }
.card-meta-item svg { width: 15px; height: 15px; stroke: var(--primary); flex-shrink: 0; }

/* 第二行：2×2 双列卡片 */
.grid-row-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

/* 第三行：跨列 + 堆叠 */
.grid-row-3 { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }
.grid-row-3-left { display: grid; }
.grid-row-3-right { display: flex; flex-direction: column; gap: 24px; }
.grid-row-3-right .content-card { flex: 1; }
.grid-row-3 .content-card-cover { aspect-ratio: 16/9; }
.grid-row-3-left .content-card-title { font-size: 22px; }

/* ===== 卖点区 ===== */
.features-section { padding: 80px 0; background: var(--bg-soft); }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 44px; }
.feature-item {
  background: var(--bg-card); border-radius: var(--radius); padding: 28px 24px;
  border: 1px solid var(--border); box-shadow: var(--shadow-card); transition: all var(--transition);
}
.feature-item:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.feature-icon {
  width: 46px; height: 46px; border-radius: 12px; background: var(--bg-soft);
  display: flex; align-items: center; justify-content: center; color: var(--primary); margin-bottom: 18px;
}
.feature-icon svg { width: 22px; height: 22px; stroke-width: 1.8; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; }
.feature-title { font-size: 17px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.feature-desc { font-size: 14px; line-height: 1.7; color: var(--text-muted); }

/* ===== 场景区 ===== */
.scene-section { padding: 80px 0; }
.scene-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px; }
.scene-card {
  background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border);
  padding: 26px 22px; text-align: center; transition: all var(--transition);
}
.scene-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: rgba(61,123,228,.3); }
.scene-num {
  font-size: 32px; font-weight: 800; font-family: ui-monospace, "DIN Alternate", monospace;
  color: var(--primary); line-height: 1.2;
}
.scene-label { font-size: 14px; font-weight: 600; color: var(--text-main); margin-top: 6px; }
.scene-tip { font-size: 13px; color: var(--text-muted); margin-top: 4px; line-height: 1.6; }

/* ===== FAQ ===== */
.faq-section { padding: 80px 0; background: var(--bg-page); }
.faq-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: flex-start; }
.faq-list { display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border);
  overflow: hidden; transition: all var(--transition);
}
.faq-item.active { border-color: rgba(61,123,228,.35); box-shadow: var(--shadow-card); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 22px; cursor: pointer; font-weight: 600; font-size: 16px; color: var(--text-main);
  transition: color var(--transition); background: none; width: 100%; text-align: left;
}
.faq-question:hover { color: var(--primary); }
.faq-icon { flex-shrink: 0; width: 20px; height: 20px; position: relative; }
.faq-icon::before, .faq-icon::after {
  content: ''; position: absolute; background: var(--primary);
  border-radius: 2px; transition: all var(--transition);
}
.faq-icon::before { width: 14px; height: 2px; top: 9px; left: 3px; }
.faq-icon::after { width: 2px; height: 14px; top: 3px; left: 9px; }
.faq-item.active .faq-icon::after { transform: scaleY(0); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .25s ease;
  padding: 0 22px; font-size: 14px; line-height: 1.75; color: var(--text-muted);
}
.faq-item.active .faq-answer { max-height: 240px; padding: 0 22px 20px; box-shadow: inset 0 2px 0 var(--primary); }

/* ===== CTA条 ===== */
.cta-bar { padding: 40px 0 100px; }
.cta-bar-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-card); padding: 32px 36px; flex-wrap: wrap;
}
.cta-bar-left h3 { font-size: 21px; font-weight: 700; color: var(--text-main); }
.cta-bar-left p { font-size: 14px; color: var(--text-muted); margin-top: 6px; max-width: 480px; }
.cta-bar-right { flex-shrink: 0; }

/* ===== 页脚 ===== */
.site-footer { background: var(--footer-bg); color: rgba(255,255,255,.75); padding-top: 64px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 0.8fr 1fr; gap: 48px; padding-bottom: 44px; }
.footer-brand .logo { color: #fff; font-size: 20px; }
.footer-brand .logo-mark { background: linear-gradient(135deg, var(--primary), #6BA3FF); }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 18px; color: rgba(255,255,255,.6); max-width: 360px; }
.footer-col h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a { color: rgba(255,255,255,.65); font-size: 14px; transition: color var(--transition), padding-left var(--transition); }
.footer-col a:hover { color: #fff; padding-left: 4px; }
.footer-contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; line-height: 1.6; color: rgba(255,255,255,.65); }
.footer-contact svg { width: 17px; height: 17px; stroke: var(--primary); flex-shrink: 0; margin-top: 3px; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,.45); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .page-hero-title { font-size: 38px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .faq-wrap { grid-template-columns: 1fr; gap: 36px; }
  .grid-row-3 { grid-template-columns: 1fr; }
  .grid-row-3-right { flex-direction: row; }
  .grid-row-3-right .content-card { flex: 1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  body { font-size: 15px; }
  .section { padding: var(--space-section-sm) 0; }
  .section-title { font-size: 28px; }
  .page-hero { padding: 120px 0 48px; }
  .page-hero-title { font-size: 32px; line-height: 1.3; }
  .page-hero-stats { gap: 24px; }
  .grid-row-2 { grid-template-columns: 1fr; }
  .grid-row-3-right { flex-direction: column; }
  .features-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: 1fr 1fr; }
  .cta-bar-inner { flex-direction: column; align-items: flex-start; padding: 28px 24px; }
  .cta-bar-right .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; padding-bottom: 36px; }
  .header-cta { display: none; }
  .cta-short { display: inline-flex; padding: 11px 18px; font-size: 14px; }
  .section-head { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 520px) {
  .container { padding-left: 18px; padding-right: 18px; }
  .page-hero-title { font-size: 27px; }
  .content-card-body { padding: 18px 16px; }
  .content-card-title { font-size: 17px; }
  .btn { width: 100%; }
  .header-inner .btn { width: auto; }
  .scene-grid { grid-template-columns: 1fr; }
  .page-hero-stats { gap: 16px; }
  .card-meta { flex-direction: column; gap: 6px; }
  .faq-question { font-size: 15px; padding: 18px 16px; }
  .faq-answer { padding: 0 16px; }
  .faq-item.active .faq-answer { padding: 0 16px 18px; }
}