:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --ink: #11130f;
  --muted: #62675f;
  --line: #dfe3dc;
  --paper: #f7f8f5;
  --white: #ffffff;
  --signal: #b9f227;
  --coral: #ff675b;
  --cyan: #4bd7e8;
  --yellow: #ffd448;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 245, 0.96);
  backdrop-filter: blur(14px);
}

.brand { display: inline-flex; align-items: center; gap: 10px; width: max-content; font-weight: 750; font-size: 18px; }
.brand-mark { width: 29px; height: 25px; display: flex; align-items: end; gap: 3px; }
.brand-mark i { display: block; width: 7px; background: var(--ink); }
.brand-mark i:nth-child(1) { height: 11px; }
.brand-mark i:nth-child(2) { height: 18px; background: var(--coral); }
.brand-mark i:nth-child(3) { height: 25px; background: var(--signal); }

.desktop-nav { display: flex; align-items: center; gap: 30px; color: #4f544d; font-size: 14px; }
.desktop-nav a, .footer-links a { transition: color 160ms ease; }
.desktop-nav a:hover, .footer-links a:hover { color: #000; }
.header-actions { justify-self: end; display: flex; align-items: center; gap: 14px; }
.language-switch { display: flex; align-items: center; border: 1px solid #cfd4cc; padding: 3px; }
.language-switch button { min-width: 42px; height: 28px; border: 0; background: transparent; color: #656a63; font: inherit; font-size: 12px; cursor: pointer; }
.language-switch button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.header-cta, .primary-cta { display: inline-flex; align-items: center; justify-content: center; gap: 20px; min-height: 42px; padding: 0 18px; background: var(--ink); color: #fff; font-size: 14px; font-weight: 700; transition: transform 160ms ease, background 160ms ease; }
.header-cta:hover, .primary-cta:hover { transform: translateY(-2px); background: #2c3029; }

.hero {
  position: relative;
  min-height: min(680px, calc(100svh - 112px));
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  background: #252823 url("./assets/strategy-room.jpg") center 44% / cover no-repeat;
}
.hero-overlay { position: absolute; inset: 0; background: rgba(11, 14, 10, 0.66); }
.hero-inner { position: relative; z-index: 1; width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 68px 0 92px; }
.eyebrow, .section-kicker { margin: 0 0 22px; font-size: 12px; line-height: 1.4; font-weight: 800; text-transform: uppercase; color: #70766d; }
.hero .eyebrow { color: var(--signal); }
.hero h1 { max-width: 100%; margin: 0; font-size: clamp(52px, 6.8vw, 96px); line-height: 0.96; font-weight: 760; letter-spacing: 0; }
html[lang="zh-CN"] .hero h1 { white-space: nowrap; }
.hero-copy { max-width: 710px; margin: 30px 0 0; color: rgba(255,255,255,0.86); font-size: 18px; line-height: 1.75; }
.hero-price { margin: 18px 0 0; color: rgba(255,255,255,0.78); font-size: 15px; }
.hero-price strong { margin-left: 6px; color: var(--signal); font-size: 20px; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 38px; }
.primary-cta { min-height: 52px; padding: 0 24px; background: var(--signal); color: #10120e; }
.primary-cta:hover { background: #d1ff59; }
.text-link { padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.45); font-size: 14px; }
.hero-signal { position: absolute; z-index: 1; right: max(24px, calc((100vw - var(--max)) / 2)); bottom: 28px; display: flex; align-items: center; gap: 9px; color: rgba(255,255,255,0.74); font-size: 12px; }
.signal-dot { width: 8px; height: 8px; background: var(--signal); box-shadow: 0 0 0 5px rgba(185,242,39,0.16); }

.proof-band { display: grid; grid-template-columns: 0.9fr 2fr; gap: 60px; width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 50px 0; border-bottom: 1px solid var(--line); }
.proof-intro { display: flex; flex-direction: column; gap: 8px; }
.proof-intro span { color: #737970; font-size: 12px; text-transform: uppercase; }
.proof-intro strong { max-width: 270px; font-size: 19px; line-height: 1.4; }
.proof-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.proof-stats div { display: flex; flex-direction: column; gap: 8px; padding-left: 18px; border-left: 1px solid var(--line); }
.proof-stats strong { font-size: 30px; line-height: 1; }
.proof-stats span { color: var(--muted); font-size: 12px; }

.value-section, .reports-section, .workflow-section { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 105px 0; }
.section-heading { width: 100%; max-width: none; }
.section-heading h2, .workspace-copy h2, .final-cta h2 { margin: 0; font-size: clamp(38px, 5vw, 66px); line-height: 1.08; font-weight: 720; letter-spacing: 0; }
.section-heading > p:last-child, .workspace-copy > p { max-width: 940px; margin: 24px 0 0; color: var(--muted); font-size: 17px; line-height: 1.75; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 72px; border-top: 1px solid var(--ink); }
.value-grid article { min-height: 280px; padding: 28px 34px 30px 0; border-right: 1px solid var(--line); }
.value-grid article + article { padding-left: 34px; }
.value-grid article:last-child { border-right: 0; }
.value-code, .report-index { display: block; color: #7b8178; font-size: 11px; font-weight: 800; }
.value-grid h3 { margin: 82px 0 15px; font-size: 24px; }
.value-grid p { margin: 0; color: var(--muted); line-height: 1.75; }

.workspace-band { display: grid; grid-template-columns: 0.78fr 1.22fr; gap: 70px; align-items: center; padding: 105px max(24px, calc((100vw - var(--max)) / 2)); background: #e9ece6; }
.feature-list { display: grid; gap: 0; margin: 38px 0 0; padding: 0; list-style: none; border-top: 1px solid #c8cdc4; }
.feature-list li { display: grid; grid-template-columns: 28px 1fr; gap: 12px; padding: 17px 0; border-bottom: 1px solid #c8cdc4; font-size: 14px; }
.feature-list li > span:first-child { color: #65705c; font-weight: 800; }

.insight-shell { min-width: 0; overflow: hidden; border: 1px solid #343833; background: #151814; color: #f8faf6; box-shadow: 0 24px 60px rgba(24,28,22,0.18); }
.insight-topbar { height: 54px; display: flex; align-items: center; justify-content: space-between; padding: 0 18px; border-bottom: 1px solid #353a32; font-size: 11px; }
.insight-logo { display: flex; align-items: center; gap: 8px; font-weight: 800; }
.insight-logo span { width: 9px; height: 9px; background: var(--signal); }
.insight-range { color: #9da49a; }
.insight-body { display: grid; grid-template-columns: 112px minmax(0, 1fr); min-height: 470px; }
.insight-body aside { display: flex; flex-direction: column; gap: 24px; padding: 26px 16px; border-right: 1px solid #353a32; color: #777e74; font-size: 10px; }
.insight-body aside .active { color: #fff; }
.insight-main { min-width: 0; padding: 24px; }
.pulse-summary { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid #353a32; }
.pulse-summary div { display: flex; flex-direction: column; gap: 8px; min-width: 0; padding: 0 14px 19px; border-right: 1px solid #353a32; }
.pulse-summary div:first-child { padding-left: 0; }
.pulse-summary div:last-child { border: 0; }
.pulse-summary span, .panel-label { color: #8b9288; font-size: 9px; text-transform: uppercase; }
.pulse-summary strong { font-size: 26px; }
.pulse-summary small { color: var(--signal); font-size: 9px; }
.chart-row { display: grid; grid-template-columns: 1.7fr 0.8fr; min-height: 215px; border-bottom: 1px solid #353a32; }
.chart-panel, .sentiment-panel { padding: 22px 0; }
.chart-panel { padding-right: 20px; border-right: 1px solid #353a32; }
.sentiment-panel { padding-left: 20px; }
.panel-label { display: flex; justify-content: space-between; }
.panel-label span { color: #5f665d; }
.line-chart { height: 145px; display: flex; align-items: end; gap: 8px; margin-top: 18px; border-bottom: 1px solid #454a43; }
.line-chart i { flex: 1; height: var(--h); background: #4bd7e8; opacity: 0.8; }
.line-chart i:nth-child(3n) { background: var(--signal); }
.sentiment-ring { width: 118px; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 34px auto 0; border: 13px solid #343a31; border-top-color: var(--coral); border-right-color: var(--signal); border-radius: 50%; }
.sentiment-ring strong { font-size: 28px; }
.sentiment-ring span { color: #8b9288; font-size: 8px; text-transform: uppercase; }
.creative-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; padding-top: 20px; }
.creative-thumb { min-width: 0; height: 90px; display: grid; align-content: end; gap: 3px; padding: 10px; color: #111; }
.creative-thumb span { align-self: start; font-size: 9px; }
.creative-thumb b { font-size: 12px; }
.creative-thumb small { font-size: 9px; }
.creative-thumb.coral { background: var(--coral); }
.creative-thumb.cyan { background: var(--cyan); }
.creative-thumb.lime { background: var(--signal); }
.creative-thumb.yellow { background: var(--yellow); }

.reports-heading { max-width: none; }
.report-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 65px; }
.report-card { position: relative; min-height: 260px; padding: 28px; border: 1px solid var(--line); background: #fff; transition: border-color 160ms ease, transform 160ms ease; }
.report-card:hover { transform: translateY(-4px); border-color: #777d74; }
.report-card h3 { margin: 72px 0 12px; font-size: 24px; }
.report-card p { max-width: 420px; margin: 0; color: var(--muted); line-height: 1.7; }
.report-arrow { position: absolute; right: 25px; top: 24px; font-size: 20px; }

.workflow-section { border-top: 1px solid var(--line); }
.workflow-heading { max-width: none; }
.workflow-list { display: grid; grid-template-columns: repeat(4, 1fr); margin: 70px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.workflow-list li { min-height: 210px; display: flex; flex-direction: column; justify-content: space-between; padding: 22px 24px 24px 0; border-right: 1px solid var(--line); }
.workflow-list li + li { padding-left: 24px; }
.workflow-list li:last-child { border: 0; }
.workflow-list > li > span { color: #7c8279; font-size: 11px; font-weight: 800; }
.workflow-list h3 { margin: 0 0 8px; font-size: 20px; }
.workflow-list p { margin: 0; color: var(--muted); font-size: 14px; }

.final-cta { display: flex; align-items: end; justify-content: space-between; gap: 50px; padding: 82px max(24px, calc((100vw - var(--max)) / 2)); background: var(--ink); color: #fff; }
.final-cta > div { max-width: 750px; }
.final-cta .section-kicker { color: var(--signal); }
.primary-cta.light { flex: 0 0 auto; background: #fff; color: var(--ink); }
.primary-cta.light:hover { background: var(--signal); }

footer { width: min(var(--max), calc(100% - 48px)); display: grid; grid-template-columns: 1fr auto; gap: 50px; margin: 0 auto; padding: 58px 0 34px; }
.footer-brand p { margin: 15px 0 0; color: var(--muted); font-size: 13px; }
.footer-links { display: flex; gap: 28px; align-items: start; color: var(--muted); font-size: 13px; }
.company-disclosure { grid-column: 1 / -1; max-width: 920px; margin: 24px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: #6f756d; font-size: 12px; line-height: 1.7; }
.copyright { grid-column: 1 / -1; margin: 0; color: #8a8f87; font-size: 11px; }

@media (max-width: 960px) {
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .hero h1 { font-size: 68px; }
  .proof-band, .workspace-band { grid-template-columns: 1fr; }
  .proof-band { gap: 34px; }
  .workspace-band { gap: 55px; }
  .value-grid { grid-template-columns: 1fr; }
  .value-grid article, .value-grid article + article { min-height: auto; padding: 30px 0 34px; border-right: 0; border-bottom: 1px solid var(--line); }
  .value-grid h3 { margin-top: 35px; }
  .workflow-list { grid-template-columns: repeat(2, 1fr); }
  .workflow-list li:nth-child(2) { border-right: 0; }
  .workflow-list li:nth-child(n+3) { border-top: 1px solid var(--line); }
  .final-cta { align-items: start; flex-direction: column; }
}

@media (max-width: 640px) {
  .site-header { height: 64px; padding: 0 16px; gap: 10px; }
  .brand { font-size: 15px; }
  .brand-mark { transform: scale(0.85); transform-origin: left center; margin-right: -4px; }
  .header-actions { gap: 8px; }
  .language-switch button { min-width: 34px; height: 27px; font-size: 10px; }
  .header-cta { min-height: 35px; padding: 0 11px; gap: 8px; font-size: 12px; }
  .hero { min-height: calc(100svh - 96px); background-position: 58% center; }
  .hero-overlay { background: rgba(11,14,10,0.7); }
  .hero-inner { width: calc(100% - 32px); padding: 68px 0 110px; }
  .hero h1 { max-width: 420px; font-size: 50px; line-height: 1; }
  html[lang="zh-CN"] .hero h1 { white-space: normal; }
  .hero-copy { font-size: 16px; line-height: 1.65; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-signal { left: 16px; right: auto; bottom: 22px; }
  .proof-band, .value-section, .reports-section, .workflow-section, footer { width: calc(100% - 32px); }
  .proof-band { padding: 38px 0; }
  .proof-stats { grid-template-columns: repeat(2, 1fr); gap: 28px 10px; }
  .proof-stats div:nth-child(odd) { border-left: 0; padding-left: 0; }
  .value-section, .reports-section, .workflow-section { padding: 78px 0; }
  .section-heading h2, .workspace-copy h2, .final-cta h2 { font-size: 38px; }
  .value-grid { margin-top: 50px; }
  .workspace-band { padding: 78px 16px; }
  .insight-body { grid-template-columns: 1fr; min-height: 420px; }
  .insight-body aside { display: none; }
  .insight-main { padding: 16px; }
  .pulse-summary strong { font-size: 20px; }
  .pulse-summary div { padding: 0 8px 15px; }
  .pulse-summary span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .chart-row { grid-template-columns: 1fr; }
  .chart-panel { border-right: 0; padding-right: 0; }
  .sentiment-panel { display: none; }
  .creative-strip { gap: 6px; }
  .creative-thumb { height: 78px; padding: 7px; }
  .report-grid { grid-template-columns: 1fr; }
  .report-card { min-height: 240px; }
  .workflow-list { grid-template-columns: 1fr; }
  .workflow-list li, .workflow-list li + li { min-height: 160px; padding: 22px 0; border-right: 0; border-top: 1px solid var(--line); }
  .workflow-list li:first-child { border-top: 0; }
  .final-cta { padding: 70px 16px; }
  footer { grid-template-columns: 1fr; gap: 30px; }
  .footer-links { flex-wrap: wrap; }
}

@media (max-width: 360px) {
  .site-header .brand > span:last-child { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}