* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --accent: #A100FF;
  --black: #1A1A1A;
  --gray: #666666;
  --light: #F5F5F5;
  --border: #E5E5E5;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--black);
  background: white;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1280px; margin: 0 auto; padding: 0 48px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 48px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1280px; margin: 0 auto; padding: 0 48px;
}
.logo-block { display: flex; flex-direction: column; gap: 2px; }
.logo { font-weight: 700; font-size: 18px; letter-spacing: -0.3px; color: var(--black); text-decoration: none; }
.logo .dot { color: var(--accent); }
.tagline { font-size: 11px; color: var(--gray); letter-spacing: 0.5px; font-style: italic; }
nav.main-nav { display: flex; gap: 32px; }
nav.main-nav a {
  color: var(--black); text-decoration: none; font-size: 15px; font-weight: 500;
  padding: 6px 0; border-bottom: 2px solid transparent; transition: all 0.2s;
}
nav.main-nav a:hover { border-bottom-color: var(--accent); color: var(--accent); }
nav.main-nav a.active { border-bottom-color: var(--accent); color: var(--accent); }
.header-right { display: flex; align-items: center; gap: 16px; }
.lang-switch button {
  background: none; border: 1px solid var(--border); color: var(--gray);
  padding: 6px 10px; font-size: 13px; cursor: pointer; border-radius: 4px;
  font-family: inherit;
}
.lang-switch button.active { background: var(--black); color: white; border-color: var(--black); }
.cta-button {
  background: var(--black); color: white; border: none; padding: 12px 24px;
  font-size: 14px; font-weight: 600; cursor: pointer; border-radius: 4px;
  font-family: inherit; transition: all 0.2s; text-decoration: none; display: inline-block;
}
.cta-button:hover { background: var(--accent); }

/* Page Hero */
.page-hero { padding: 80px 0 64px; border-bottom: 1px solid var(--border); }
.breadcrumb { font-size: 13px; color: var(--gray); margin-bottom: 32px; }
.breadcrumb a { color: var(--gray); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 8px; color: var(--border); }
.page-hero h1 {
  font-size: clamp(40px, 6vw, 72px); font-weight: 700; line-height: 1.05;
  letter-spacing: -1.5px; margin-bottom: 24px; max-width: 900px;
}
.page-hero .lead {
  font-size: clamp(18px, 1.5vw, 22px); color: var(--gray); max-width: 720px;
  line-height: 1.5;
}

/* Index Hero */
.hero {
  padding: 120px 0 100px;
  border-bottom: 1px solid var(--border);
}
.hero-tag {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--accent); letter-spacing: 1.5px; margin-bottom: 24px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(48px, 8vw, 96px); font-weight: 700; line-height: 1.05;
  letter-spacing: -2px; margin-bottom: 32px; color: var(--black);
}
.hero h1 .accent { color: var(--accent); }
.hero-sub {
  font-size: clamp(20px, 2vw, 24px); color: var(--gray); font-weight: 400;
  line-height: 1.5; max-width: 720px; margin-bottom: 24px;
}
.hero-body {
  font-size: 17px; color: var(--gray); max-width: 720px; margin-bottom: 24px;
}
.hero-body strong { color: var(--black); }
.hero-cta { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }

/* Buttons */
.btn-primary {
  background: var(--black); color: white; border: 2px solid var(--black);
  padding: 16px 32px; font-size: 15px; font-weight: 600; cursor: pointer;
  border-radius: 4px; text-decoration: none; display: inline-block;
  font-family: inherit; transition: all 0.2s;
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }
.btn-secondary {
  background: white; color: var(--black); border: 2px solid var(--black);
  padding: 16px 32px; font-size: 15px; font-weight: 600; cursor: pointer;
  border-radius: 4px; text-decoration: none; display: inline-block;
  font-family: inherit; transition: all 0.2s;
}
.btn-secondary:hover { background: var(--black); color: white; }

/* Sections */
section { padding: 100px 0; border-bottom: 1px solid var(--border); }
section.dark { background: var(--black); color: white; border-bottom: none; }
section.dark .section-label { color: var(--accent); }
section.dark h2 { color: white; }
section.dark .card { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.1); }
section.dark .card h3, section.dark .card .meta { color: white; }
section.dark .card p { color: rgba(255,255,255,0.7); }
section.gray { background: var(--light); }
.section-label {
  font-size: 13px; font-weight: 600; color: var(--accent);
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 16px;
}
h2 {
  font-size: clamp(36px, 5vw, 64px); font-weight: 700; line-height: 1.1;
  letter-spacing: -1px; margin-bottom: 24px; max-width: 900px;
}
h3 { font-size: 28px; font-weight: 700; line-height: 1.2; margin-bottom: 16px; }
.section-intro {
  font-size: 20px; color: var(--gray); max-width: 720px; margin-bottom: 64px;
}

/* Brand mark */
.brand-mark {
  text-align: center; padding: 56px 0; border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border); background: white;
}
.brand-mark .quote-en {
  font-family: 'Plantin', 'Times New Roman', Georgia, serif;
  font-size: 32px; font-style: italic; color: var(--black);
  letter-spacing: -0.5px; margin-bottom: 12px;
}
.brand-mark .quote-zh {
  font-size: 28px; font-weight: 400; color: var(--black);
  letter-spacing: 8px; font-family: 'STSong', 'SimSun', serif;
}
.brand-mark .accent-line {
  width: 40px; height: 2px; background: var(--accent);
  margin: 24px auto;
}

/* Hook cards */
.hooks { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.hook-card {
  border: 1px solid var(--border); padding: 32px; border-radius: 8px;
  transition: all 0.3s; background: white; cursor: pointer;
}
.hook-card:hover { border-color: var(--black); transform: translateY(-4px); }
.hook-card .index {
  color: var(--accent); font-weight: 700; font-size: 14px; margin-bottom: 16px;
}
.hook-card h3 {
  font-size: 22px; font-weight: 700; line-height: 1.3; margin-bottom: 12px;
  color: var(--black);
}
.hook-card p { font-size: 15px; color: var(--gray); margin-bottom: 16px; }
.hook-card .read-more { font-size: 13px; color: var(--accent); font-weight: 600; }

/* Method cards */
.method-five { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-top: 48px; }
@media (max-width: 900px) { .method-five { grid-template-columns: repeat(2, 1fr); } }
.method-card { padding: 32px 24px; border: 1px solid var(--border); border-radius: 8px; background: white; }
.method-card .num { font-size: 40px; font-weight: 700; color: var(--accent); line-height: 1; margin-bottom: 16px; }
.method-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.method-card p { font-size: 14px; color: var(--gray); }

/* Services */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 768px) { .services-grid { grid-template-columns: 1fr; } }
.service-card {
  padding: 40px; border: 1px solid var(--border); border-radius: 8px;
  background: white; transition: all 0.3s; text-decoration: none; color: inherit; display: block;
}
.service-card.recommend { border-color: var(--accent); border-width: 2px; position: relative; }
.service-card.recommend::before {
  content: '推荐 · Recommended'; position: absolute; top: -12px; left: 32px;
  background: var(--accent); color: white; padding: 4px 12px; border-radius: 4px;
  font-size: 12px; font-weight: 600;
}
.service-card:hover { border-color: var(--black); transform: translateY(-4px); }
.service-card h3 { font-size: 24px; font-weight: 700; margin-bottom: 16px; }
.service-card .price { color: var(--accent); font-weight: 600; font-size: 18px; margin-bottom: 16px; }
.service-card p { color: var(--gray); margin-bottom: 24px; }
.service-card .learn-more { font-size: 14px; font-weight: 600; color: var(--black); text-decoration: none; border-bottom: 2px solid var(--black); }

/* Industries */
.industries-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.industry-card {
  padding: 32px; border: 1px solid var(--border); border-radius: 8px;
  background: white; transition: all 0.3s; cursor: pointer; text-decoration: none; color: inherit; display: block;
}
.industry-card:hover { border-color: var(--accent); background: var(--light); }
.industry-card h4 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.industry-card p { font-size: 14px; color: var(--gray); }

/* Cases */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.case-card {
  padding: 32px; background: white; border: 1px solid var(--border);
  border-radius: 8px; transition: all 0.3s;
}
.case-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.06); }
.case-card .case-tag { font-size: 12px; color: var(--accent); font-weight: 600; margin-bottom: 12px; text-transform: uppercase; letter-spacing: 1px; }
.case-card h4 { font-size: 22px; font-weight: 700; margin-bottom: 16px; }
.case-card .metrics { display: flex; gap: 24px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.case-card .metric { font-size: 13px; color: var(--gray); }
.case-card .metric .num { display: block; font-size: 28px; font-weight: 700; color: var(--accent); }

/* Trust wall */
.trust-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; }
.trust-item { padding: 24px 0; border-top: 1px solid rgba(255,255,255,0.1); }
.trust-item h5 { font-size: 13px; color: var(--accent); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 1px; }
.trust-item p { font-size: 16px; color: rgba(255,255,255,0.85); line-height: 1.5; }

/* Insights */
.flagship-report {
  background: var(--black); color: white; padding: 64px;
  border-radius: 8px; margin-bottom: 48px;
}
.flagship-report .label { color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 16px; }
.flagship-report h3 { font-size: 36px; line-height: 1.1; margin-bottom: 16px; color: white; }
.flagship-report p { color: rgba(255,255,255,0.8); margin-bottom: 24px; max-width: 640px; }
.flagship-report .btn-primary { background: var(--accent); border-color: var(--accent); }
.flagship-report .btn-primary:hover { background: white; color: var(--black); border-color: white; }
.insights-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.insight-link {
  padding: 24px; border: 1px solid var(--border); border-radius: 8px;
  background: white; text-decoration: none; color: var(--black);
  display: block; transition: all 0.3s;
}
.insight-link:hover { border-color: var(--accent); transform: translateY(-2px); }
.insight-link h5 { font-size: 17px; font-weight: 700; line-height: 1.3; margin-bottom: 12px; }
.insight-link .read-arrow { color: var(--accent); font-size: 13px; font-weight: 600; }

/* Team */
.team-content { display: grid; grid-template-columns: 1fr 2fr; gap: 64px; align-items: start; }
@media (max-width: 768px) { .team-content { grid-template-columns: 1fr; } }
.founder-card { padding: 32px; background: var(--light); border-radius: 8px; }
.founder-card .avatar {
  width: 72px; height: 72px; border-radius: 50%; background: var(--black);
  color: white; display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 700; margin-bottom: 16px;
}
.founder-card h4 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.founder-card .title { font-size: 14px; color: var(--gray); margin-bottom: 16px; }
.team-engineering p { font-size: 18px; line-height: 1.7; color: var(--black); margin-bottom: 24px; }

/* Team grid (full team page) */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.member-card { padding: 32px; border: 1px solid var(--border); border-radius: 8px; background: white; transition: all 0.2s; }
.member-card:hover { border-color: var(--black); }
.member-card .avatar-sm { width: 56px; height: 56px; border-radius: 50%; background: var(--black); color: white; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 16px; font-size: 22px; }
.member-card h4 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.member-card .role { font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.member-card p { font-size: 14px; color: var(--gray); line-height: 1.6; margin-bottom: 12px; }
.member-card .en-bio { color: var(--gray); font-size: 13px; font-style: italic; padding-top: 12px; border-top: 1px solid var(--border); }

/* Footer CTA */
.footer-cta {
  padding: 100px 0; background: var(--accent); color: white; text-align: center;
}
.footer-cta h2 { color: white; margin: 0 auto 32px; }
.footer-cta .btn-primary { background: white; color: var(--accent); border-color: white; }
.footer-cta .btn-primary:hover { background: var(--black); color: white; border-color: var(--black); }
.footer-cta .btn-secondary { background: transparent; color: white; border-color: white; }
.footer-cta .btn-secondary:hover { background: white; color: var(--accent); }

/* Footer */
footer.site-footer {
  padding: 64px 0 32px; background: var(--black); color: rgba(255,255,255,0.7);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
footer h6 { color: white; font-size: 14px; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
footer ul { list-style: none; }
footer li { margin-bottom: 8px; font-size: 14px; }
footer a { color: rgba(255,255,255,0.7); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--accent); }
.footer-bottom { padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 13px; }

/* EN/ZH visibility */
.lang-en { display: none; }
body.lang-en .lang-zh { display: none; }
body.lang-en .lang-en { display: initial; }

/* Preview banner */
.preview-banner {
  background: #FFF3CD; border-bottom: 1px solid #FFEEBA;
  padding: 8px 24px; font-size: 13px; color: #856404;
  text-align: center;
}

/* Report page specific */
.report-hero {
  background: var(--black); color: white; padding: 120px 0 100px;
  border-bottom: none;
}
.report-hero .label { color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 24px; }
.report-hero h1 { color: white; font-size: clamp(48px, 7vw, 88px); }
.report-hero .subtitle {
  font-size: clamp(22px, 2.5vw, 32px); color: rgba(255,255,255,0.85);
  margin-top: 16px; margin-bottom: 32px; font-weight: 400; line-height: 1.3;
}
.report-hero .author-line { color: rgba(255,255,255,0.6); font-size: 14px; margin-top: 32px; }
.thesis-block { padding: 60px 0; border-bottom: 1px solid var(--border); }
.thesis-block .num { font-size: 14px; color: var(--accent); font-weight: 700; letter-spacing: 2px; margin-bottom: 16px; }
.thesis-block h3 { font-size: clamp(28px, 4vw, 44px); margin-bottom: 24px; line-height: 1.15; max-width: 800px; }
.thesis-block .body { font-size: 18px; line-height: 1.7; color: var(--gray); max-width: 720px; margin-bottom: 24px; }
.thesis-block .body strong { color: var(--black); }
.stat-quote {
  background: var(--light); padding: 24px 32px; border-left: 4px solid var(--accent);
  margin-top: 24px; font-size: 16px; line-height: 1.7; max-width: 800px;
}
.stat-quote strong { color: var(--black); display: inline-block; min-width: 120px; }

/* Method matrix */
.matrix-table { width: 100%; border-collapse: collapse; margin-top: 32px; }
.matrix-table th, .matrix-table td { padding: 16px; text-align: left; border: 1px solid var(--border); font-size: 15px; }
.matrix-table th { background: var(--light); font-weight: 700; }

/* Lead form */
.lead-form { background: var(--light); padding: 64px; border-radius: 8px; max-width: 720px; margin: 0 auto; }
.lead-form h3 { margin-bottom: 16px; }
.lead-form input, .lead-form select {
  width: 100%; padding: 14px 16px; border: 1px solid var(--border);
  border-radius: 4px; font-size: 15px; margin-bottom: 16px;
  font-family: inherit; background: white;
}
.lead-form .privacy { font-size: 12px; color: var(--gray); margin-top: 16px; }

/* Sticky CTA */
.sticky-cta {
  position: fixed; bottom: 24px; right: 24px; z-index: 99;
  background: var(--black); color: white; padding: 20px 28px;
  border-radius: 8px; box-shadow: 0 16px 48px rgba(0,0,0,0.2);
  display: flex; gap: 16px; align-items: center; max-width: 380px;
}
.sticky-cta p { font-size: 14px; line-height: 1.4; }
.sticky-cta .btn-primary { background: var(--accent); border-color: var(--accent); padding: 10px 20px; font-size: 13px; }

/* Page navigation tabs */
.page-tabs {
  display: flex; gap: 8px; padding: 24px 0; border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.page-tabs a {
  padding: 8px 16px; font-size: 14px; color: var(--gray); text-decoration: none;
  border-radius: 4px; white-space: nowrap; transition: all 0.2s;
}
.page-tabs a:hover { color: var(--black); background: var(--light); }
.page-tabs a.active { color: var(--accent); background: var(--light); font-weight: 600; }

/* Insights center grid */
.insight-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.insight-tile {
  padding: 32px; background: white; border: 1px solid var(--border); border-radius: 8px;
  transition: all 0.3s; text-decoration: none; color: inherit; display: block;
}
.insight-tile:hover { border-color: var(--black); transform: translateY(-4px); }
.insight-tile .meta { font-size: 12px; color: var(--gray); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 1px; }
.insight-tile h4 { font-size: 20px; font-weight: 700; line-height: 1.3; margin-bottom: 12px; }
.insight-tile p { font-size: 14px; color: var(--gray); line-height: 1.6; margin-bottom: 16px; }
.insight-tile .read-arrow { font-size: 13px; color: var(--accent); font-weight: 600; }

/* About specific */
.about-quote {
  font-family: 'Plantin', 'Times New Roman', Georgia, serif;
  font-style: italic; font-size: clamp(28px, 4vw, 48px);
  color: var(--accent); line-height: 1.3; max-width: 880px;
  margin: 0 auto; text-align: center;
}
.about-quote .zh {
  font-style: normal; font-family: 'STSong', 'SimSun', serif;
  letter-spacing: 4px; color: var(--black); display: block; margin-top: 16px;
  font-size: 0.85em;
}