:root {
  --navy: #0b2442;
  --blue: #174f9b;
  --blue-bright: #2469ca;
  --orange: #e56a2d;
  --paper: #ffffff;
  --pale: #f3f7fc;
  --ice: #eaf1fa;
  --text: #23364b;
  --muted: #677483;
  --line: rgba(11, 36, 66, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--navy);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.site-header {
  height: 78px;
  padding: 0 clamp(22px, 4.5vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.brand { font-size: 18px; font-weight: 800; letter-spacing: .02em; }
.brand span { color: #9ba7b4; font-weight: 400; }
nav { display: flex; align-items: center; gap: clamp(20px, 2.5vw, 38px); font-size: 14px; font-weight: 650; }
nav > a:not(.nav-cta) { position: relative; }
nav > a:not(.nav-cta)::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px;
  background: var(--blue-bright); transition: right 180ms ease;
}
nav > a:hover::after { right: 0; }
.nav-cta {
  padding: 11px 20px; border: 1px solid var(--blue); border-radius: 7px;
  color: var(--blue); transition: 180ms ease;
}
.nav-cta:hover { background: var(--blue); color: white; }

.hero {
  min-height: calc(100vh - 78px);
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(390px, .78fr);
  background: linear-gradient(130deg, #f8fbff 0%, #eef4fb 62%, #dde9f7 100%);
  overflow: hidden;
}
.hero-copy {
  padding: clamp(64px, 8vh, 106px) clamp(38px, 6.8vw, 108px);
  display: flex; flex-direction: column; justify-content: center;
}
.eyebrow {
  margin: 0 0 20px; color: var(--blue-bright); font-size: 11px;
  font-weight: 800; letter-spacing: .24em;
}
h1 {
  max-width: 800px; margin: 0; font-size: clamp(44px, 4vw, 64px);
  line-height: 1.38; letter-spacing: -.045em; font-weight: 820;
}
.hero-text {
  max-width: 690px; margin: 26px 0 0; color: #536579; font-size: 17px; line-height: 1.95;
}
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 34px; }
.primary-button {
  min-height: 56px; padding: 0 28px; display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 8px; background: var(--blue); color: white; font-size: 16px;
  font-weight: 750; cursor: pointer; box-shadow: 0 10px 28px rgba(23,79,155,.18);
  transition: 180ms ease;
}
.primary-button:hover { transform: translateY(-2px); background: #103f81; box-shadow: 0 14px 32px rgba(23,79,155,.24); }
.text-link { color: var(--blue); font-weight: 750; }
.proof-row {
  display: flex; gap: 28px; margin-top: 46px; padding-top: 24px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px;
}
.proof-row span { display: flex; align-items: baseline; gap: 7px; }
.proof-row b { color: var(--navy); font-size: 20px; }
.hero-portrait {
  position: relative; min-height: 650px; background: #d9e4f1; clip-path: polygon(15% 0,100% 0,100% 100%,0 100%);
}
.hero-portrait img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 50%; }
.growth-line {
  position: absolute; inset: 11% 8% auto auto; z-index: 2; width: 58%; height: 40%;
  border-top: 2px solid rgba(229,106,45,.7); border-right: 2px solid rgba(229,106,45,.7);
  border-radius: 0 80px 0 0; pointer-events: none;
}
.portrait-caption {
  position: absolute; left: 13%; bottom: 5%; z-index: 3; padding: 14px 18px; display: flex;
  flex-direction: column; gap: 4px; background: rgba(11,36,66,.9); color: white; border-left: 3px solid var(--orange);
}
.portrait-caption span { color: rgba(255,255,255,.68); font-size: 12px; }

.section { padding: 82px clamp(28px, 7vw, 112px); }
.section-heading {
  max-width: 1280px; margin: 0 auto 34px; display: grid; grid-template-columns: 1.15fr .85fr;
  gap: 48px; align-items: end;
}
h2 { margin: 0; font-size: clamp(34px, 3.2vw, 50px); line-height: 1.35; letter-spacing: -.035em; }
.section-heading > p { margin: 0; color: var(--muted); line-height: 1.85; }

.decision-section { padding: 74px clamp(28px, 7vw, 112px); background: var(--navy); color: white; }
.decision-heading { max-width: 1280px; margin: 0 auto 42px; }
.decision-heading h2 { max-width: 780px; }
.decision-grid { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid rgba(255,255,255,.18); }
.decision-grid article { padding: 30px 42px 8px 0; border-right: 1px solid rgba(255,255,255,.18); }
.decision-grid article + article { padding-left: 38px; }
.decision-grid article:last-child { border-right: 0; }
.decision-grid span { color: #74a9ed; font-size: 12px; font-weight: 800; }
.decision-grid h3 { margin: 13px 0 10px; font-size: 21px; }
.decision-grid p { margin: 0; color: rgba(255,255,255,.62); line-height: 1.75; font-size: 14px; }

.solutions-section { background: white; }
.solution-accordion { max-width: 1280px; margin: 0 auto; border-top: 1px solid var(--line); }
.solution-accordion details { border-bottom: 1px solid var(--line); }
.solution-accordion summary {
  min-height: 116px; padding: 24px 10px; display: grid; grid-template-columns: 70px 245px 1fr 46px;
  gap: 18px; align-items: center; list-style: none; cursor: pointer;
}
.solution-accordion summary::-webkit-details-marker { display: none; }
.solution-index { color: var(--blue-bright); font-weight: 800; }
.solution-title { display: flex; flex-direction: column; gap: 6px; }
.solution-title strong { font-size: 24px; }
.solution-title small { color: var(--blue); }
.summary-copy { color: var(--muted); font-size: 14px; line-height: 1.7; }
.summary-icon { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--pale); color: var(--blue); font-size: 24px; transition: 180ms ease; }
details[open] .summary-icon { transform: rotate(45deg); background: var(--blue); color: white; }
.solution-body { padding: 0 0 34px 333px; display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
.solution-body article { padding: 24px; border-radius: 10px; background: var(--pale); }
.solution-body h3 { margin: 0 0 9px; font-size: 17px; }
.solution-body p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.diagnostic-section {
  padding: 82px clamp(28px, 7vw, 112px); display: grid; grid-template-columns: .8fr 1.2fr;
  gap: 90px; background: linear-gradient(120deg, #0c2e56, #174f9b); color: white;
}
.diagnostic-copy { max-width: 540px; }
.diagnostic-copy .eyebrow { color: #86b9f6; }
.diagnostic-copy > p:not(.eyebrow) { color: rgba(255,255,255,.7); line-height: 1.9; }
.diagnostic-note { margin-top: 26px; padding: 14px 16px; border-left: 3px solid var(--orange); background: rgba(255,255,255,.08); font-size: 13px; }
.diagnostic-card { padding: 34px; border-radius: 16px; background: white; color: var(--navy); box-shadow: 0 20px 60px rgba(0,0,0,.22); }
.diagnostic-card label, .feedback-form label { display: flex; flex-direction: column; gap: 9px; margin-bottom: 20px; font-size: 13px; font-weight: 750; }
input, select, textarea { width: 100%; padding: 13px 14px; border: 1px solid var(--line); border-radius: 7px; background: white; color: var(--navy); outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--blue-bright); box-shadow: 0 0 0 3px rgba(36,105,202,.12); }
.diagnosis-result { margin-top: 24px; padding: 22px; border-radius: 10px; background: var(--pale); border-left: 4px solid var(--orange); }
.diagnosis-result > span { color: var(--orange); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.diagnosis-result h3 { margin: 8px 0; }
.diagnosis-result p { margin: 0 0 13px; color: var(--muted); line-height: 1.75; font-size: 14px; }
.diagnosis-result strong { color: var(--blue); font-size: 13px; }

.evidence-section { background: var(--pale); }
.training-photo-grid {
  max-width: 1280px; margin: 0 auto 38px; display: grid;
  grid-template-columns: 1.5fr .75fr .75fr; gap: 12px;
}
.training-photo {
  height: 270px; margin: 0; position: relative; overflow: hidden; border-radius: 12px;
  background: #dce5ef;
}
.training-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.training-photo-wide img { object-position: center 38%; }
.training-photo figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 32px 18px 15px;
  color: white; font-size: 12px; font-weight: 700;
  background: linear-gradient(transparent, rgba(7,27,50,.82));
}
.featured-case {
  max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 280px 1fr;
  border-radius: 14px; overflow: hidden; background: white; box-shadow: 0 16px 44px rgba(11,36,66,.08);
}
.case-label { padding: 34px; display: flex; flex-direction: column; justify-content: center; background: var(--navy); color: white; }
.case-label span { color: #88b8f2; font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.case-label strong { margin: 18px 0 9px; font-size: 23px; line-height: 1.5; }
.case-label small { color: rgba(255,255,255,.52); }
.case-journey { display: grid; grid-template-columns: repeat(3,1fr); }
.case-journey > div { padding: 34px 28px; border-right: 1px solid var(--line); }
.case-journey > div:last-child { border-right: 0; }
.case-journey span { color: var(--blue); font-size: 12px; font-weight: 800; }
.case-journey p { margin: 15px 0 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.case-journey .case-result { background: #edf5ff; }
.case-journey .case-result p { color: var(--navy); font-weight: 650; }
.feedback-subheading { max-width: 1280px; margin: 0 auto 20px; display: flex; align-items: end; justify-content: space-between; }
.feedback-subheading span { color: var(--blue-bright); font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.feedback-subheading h3 { margin: 7px 0 0; font-size: 28px; }
.feedback-subheading a { color: var(--blue); font-size: 13px; font-weight: 750; }
.feedback-cta {
  padding: 11px 16px; border: 1px solid rgba(23,79,155,.28); border-radius: 7px;
  background: white;
}
.testimonial-grid { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.testimonial {
  min-height: 295px; margin: 0; padding: 28px; display: flex; flex-direction: column;
  justify-content: space-between; border-radius: 12px; background: white; box-shadow: 0 12px 34px rgba(11,36,66,.06);
}
.testimonial blockquote { margin: 0; color: var(--text); font-family: "Songti SC","Noto Serif SC",serif; font-size: 18px; line-height: 1.9; }
.testimonial figcaption { padding-top: 22px; display: flex; flex-direction: column; gap: 6px; border-top: 1px solid var(--line); }
.testimonial figcaption strong { font-size: 13px; }
.testimonial figcaption span { color: var(--muted); font-size: 12px; }
.case-subheading { max-width: 1280px; margin: 40px auto 18px; }
.case-subheading span { color: var(--blue-bright); font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.case-subheading h3 { margin: 7px 0 0; font-size: 25px; }

.resources-section { background: white; }
.resource-grid { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr .9fr .9fr; gap: 18px; }
.resource-card { min-height: 300px; padding: 32px; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 14px; background: white; }
.resource-card.featured { background: var(--navy); color: white; border-color: var(--navy); }
.file-type { color: var(--blue-bright); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.featured .file-type { color: #8dbcf5; }
.resource-card h3 { margin: 28px 0 14px; font-size: 23px; line-height: 1.45; }
.resource-card p { margin: 0; color: var(--muted); line-height: 1.8; font-size: 14px; }
.featured p { color: rgba(255,255,255,.62); }
.resource-card a { margin-top: auto; padding-top: 24px; color: var(--blue); font-weight: 800; border-top: 1px solid var(--line); }
.featured a { color: white; border-color: rgba(255,255,255,.16); }
.resource-card a span { float: right; font-size: 20px; }

.method-section { background: var(--ice); }
.method-copy { max-width: 900px; margin-bottom: 48px; }
.method-flow { display: grid; grid-template-columns: repeat(5,1fr); max-width: 1280px; }
.method-flow article { min-height: 220px; padding: 28px 24px; border-left: 1px solid rgba(23,79,155,.18); }
.method-flow article:last-child { border-right: 1px solid rgba(23,79,155,.18); }
.method-flow span { color: var(--blue-bright); font-size: 12px; font-weight: 800; }
.method-flow h3 { margin: 22px 0 12px; font-size: 22px; }
.method-flow p { margin: 0; color: var(--muted); line-height: 1.75; font-size: 13px; }

.feedback-section { padding: 82px clamp(28px, 7vw, 112px); display: grid; grid-template-columns: .85fr 1.15fr; gap: 60px; background: #e8eef6; }
.feedback-copy > p:not(.eyebrow) { max-width: 540px; color: var(--muted); line-height: 1.85; }
.feedback-copy ul { margin: 25px 0 0; padding: 0; list-style: none; color: var(--muted); line-height: 2; }
.feedback-copy li::before { content: "✓"; margin-right: 10px; color: var(--blue-bright); font-weight: 800; }
.wechat-contact {
  max-width: 470px; margin-top: 28px; padding: 16px; display: flex; align-items: center; gap: 18px;
  border: 1px solid rgba(23,79,155,.14); border-radius: 12px; background: rgba(255,255,255,.72);
}
.wechat-contact img { width: 112px; height: 112px; object-fit: contain; border-radius: 8px; background: white; }
.wechat-contact div { display: flex; flex-direction: column; gap: 7px; }
.wechat-contact span { color: var(--blue-bright); font-size: 11px; font-weight: 800; letter-spacing: .09em; }
.wechat-contact strong { color: var(--navy); font-size: 17px; line-height: 1.45; }
.wechat-contact small { color: var(--muted); line-height: 1.6; }
.feedback-form { padding: 34px; border-radius: 14px; background: white; box-shadow: 0 16px 48px rgba(11,36,66,.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
textarea { resize: vertical; }
.consent { flex-direction: row !important; align-items: flex-start; gap: 10px !important; color: var(--muted); font-weight: 400 !important; line-height: 1.6; }
.consent input { width: 16px; height: 16px; margin-top: 3px; }
.submit-button { width: 100%; }
.submit-button:disabled { opacity: .6; cursor: wait; }
.form-status { min-height: 20px; margin: 12px 0 0; text-align: center; font-size: 13px; }
.form-status.sent { color: #35734b; }
.form-status.error { color: #a43a2a; }

footer { min-height: 130px; padding: 32px clamp(28px, 7vw, 112px); display: flex; align-items: center; justify-content: space-between; background: var(--navy); color: white; }
footer div { display: flex; flex-direction: column; gap: 9px; }
footer span { color: rgba(255,255,255,.55); font-size: 12px; }
footer a { color: rgba(255,255,255,.7); font-size: 13px; }

@media (max-width: 1050px) {
  nav a:not(.nav-cta) { display: none; }
  .hero { grid-template-columns: 1.08fr .92fr; }
  .hero-copy { padding-left: 44px; padding-right: 28px; }
  h1 { font-size: 46px; }
  .section-heading, .diagnostic-section, .feedback-section { gap: 48px; }
}

@media (max-width: 760px) {
  .site-header { height: 66px; padding: 0 17px; }
  .brand { font-size: 13px; }
  .nav-cta { padding: 8px 11px; font-size: 12px; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { padding: 62px 22px 50px; }
  h1 { font-size: 38px; }
  .hero-text { font-size: 15px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 17px; }
  .primary-button { width: 100%; }
  .proof-row { flex-direction: column; gap: 10px; margin-top: 35px; }
  .hero-portrait { min-height: 470px; clip-path: polygon(0 8%,100% 0,100% 100%,0 100%); }
  .decision-section, .section, .diagnostic-section, .feedback-section { padding: 54px 21px; }
  .decision-grid, .section-heading, .diagnostic-section, .testimonial-grid, .resource-grid, .method-flow, .feedback-section { grid-template-columns: 1fr; }
  .training-photo-grid { grid-template-columns: 1fr 1fr; gap: 9px; margin-bottom: 30px; }
  .training-photo { height: 190px; }
  .training-photo-wide { grid-column: 1 / -1; height: 235px; }
  .featured-case { grid-template-columns: 1fr; }
  .case-journey { grid-template-columns: 1fr; }
  .case-journey > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .feedback-subheading { align-items: flex-start; flex-direction: column; gap: 14px; }
  .feedback-cta { width: 100%; text-align: center; }
  .decision-grid article, .decision-grid article + article { padding: 25px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.15); }
  .section-heading { gap: 20px; margin-bottom: 34px; }
  h2 { font-size: 33px; }
  .solution-accordion summary { grid-template-columns: 40px 1fr 38px; min-height: 100px; }
  .summary-copy { display: none; }
  .solution-title strong { font-size: 21px; }
  .solution-body { padding: 0 0 24px 0; grid-template-columns: 1fr; }
  .diagnostic-card, .feedback-form { padding: 25px 19px; }
  .testimonial { min-height: auto; }
  .wechat-contact { max-width: none; }
  .wechat-contact img { width: 94px; height: 94px; }
  .resource-card { min-height: 280px; }
  .method-flow article, .method-flow article:last-child { min-height: auto; padding: 24px 0; border-left: 0; border-right: 0; border-top: 1px solid rgba(23,79,155,.18); }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  footer { align-items: flex-start; flex-direction: column; gap: 28px; }
}

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