/* ========================================
   朗微资本 品牌官网 — 样式系统
   主色调: 朗微橙 #F58220
   深色背景: #0F1629 / #1A2240
   浅色背景: #F8F9FA / #F5F0EA
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

/* ——— Reset & Base ——— */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --orange: #F58220;
  --orange-dark: #D4721A;
  --orange-light: #FFF4EA;
  --orange-glow: rgba(245,130,32,0.15);

  --dark: #0F1629;
  --dark-2: #1A2240;
  --dark-3: #243050;

  --cream: #F5F0EA;

  --text: #1a1a1a;
  --text-2: #555;
  --text-3: #999;

  --white: #FFFFFF;
  --line: #E8E8E8;
  --line-dark: rgba(255,255,255,0.1);

  --max-w: 1200px;
  --nav-h: 80px;

  --shadow: 0 2px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.10);
  --radius: 12px;
  --radius-sm: 8px;

  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 10000;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background: var(--orange); color: var(--white); font-weight: 600;
  transform: translateY(-160%); transition: transform var(--transition);
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid rgba(245,130,32,0.45); outline-offset: 3px; }

/* ——— Navigation ——— */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

#navbar.scrolled { border-bottom-color: var(--line); box-shadow: var(--shadow); }

.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px;
}

.nav-logo .logo-img { height: 72px; width: auto; }

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--text-2);
  position: relative; padding: 4px 0;
  transition: color var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--orange); transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-links a:hover, .nav-links a.nav-active { color: var(--orange); }
.nav-links a:hover::after, .nav-links a.nav-active::after { transform: scaleX(1); }

.nav-cta-link {
  background: var(--orange); color: var(--white) !important;
  padding: 8px 20px !important; border-radius: 24px;
  transition: background var(--transition);
}
.nav-cta-link::after { display: none !important; }
.nav-cta-link:hover { background: var(--orange-dark) !important; }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.menu-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text); transition: all var(--transition);
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ——— Screen Layout ——— */
.screen { min-height: 100vh; display: flex; align-items: center; position: relative; overflow: hidden; }
.screen-light { background: var(--white); }
.screen-dark { background: var(--dark); color: var(--white); }
.screen-accent { background: linear-gradient(135deg, var(--orange), var(--orange-dark)); color: var(--white); }
.screen-cream { background: var(--cream); }

.section-container { max-width: var(--max-w); margin: 0 auto; padding: 100px 32px; width: 100%; }

.section-header { text-align: center; margin-bottom: 60px; }
.section-label {
  display: inline-block; font-size: 13px; font-weight: 600;
  letter-spacing: 4px; text-transform: uppercase;
  color: var(--orange); margin-bottom: 16px;
  padding: 6px 16px; background: var(--orange-light); border-radius: 4px;
}
.screen-dark .section-label,
.screen-accent .section-label { background: rgba(255,255,255,0.15); color: var(--white); }

.section-title { font-size: 40px; font-weight: 700; line-height: 1.3; letter-spacing: -0.5px; }
.text-light { color: var(--white); }

.section-sub {
  margin-top: 16px; font-size: 17px; color: var(--text-2); max-width: 600px; margin-left: auto; margin-right: auto;
}
.screen-dark .section-sub,
.screen-accent .section-sub { color: rgba(255,255,255,0.7); }

/* ——— Hero Screen 1 ——— */
.screen-hero {
  background: var(--dark);
  color: var(--white);
  text-align: center;
  position: relative;
}

.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(245,130,32,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 20% 80%, rgba(245,130,32,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 20%, rgba(245,130,32,0.06) 0%, transparent 60%);
}

.hero-content { position: relative; z-index: 2; max-width: 900px; margin: 0 auto; padding: 0 32px; }

.hero-label {
  font-size: 14px; font-weight: 600; letter-spacing: 8px;
  color: var(--orange); margin-bottom: 32px;
  animation: fadeInUp 0.8s ease;
}

.hero-title {
  font-size: 52px; font-weight: 700; line-height: 1.25; letter-spacing: -1px;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.15s both;
}
.text-accent { color: var(--orange); }
.hero-roles { display: block; font-size: 36px; white-space: nowrap; margin-top: 4px; }

.hero-desc {
  font-size: 19px; color: rgba(255,255,255,0.7); line-height: 1.6;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-btns { display: flex; gap: 16px; justify-content: center; animation: fadeInUp 0.8s ease 0.45s both; }
.hero-focus {
  display: flex; justify-content: center; align-items: center; gap: 0;
  margin-top: 44px; color: rgba(255,255,255,0.52);
  font-size: 13px; letter-spacing: 2px;
  animation: fadeInUp 0.8s ease 0.6s both;
}
.hero-focus span { display: flex; align-items: center; }
.hero-focus span + span::before {
  content: ''; width: 28px; height: 1px; margin: 0 18px;
  background: rgba(245,130,32,0.5);
}

.scroll-hint {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  animation: scrollBounce 2s infinite;
  z-index: 2;
}
.scroll-hint span {
  display: block; width: 20px; height: 20px;
  border-right: 2px solid rgba(255,255,255,0.4);
  border-bottom: 2px solid rgba(255,255,255,0.4);
  transform: rotate(45deg);
}

/* ——— Buttons ——— */
.btn { display: inline-block; padding: 14px 36px; border-radius: 28px; font-size: 16px; font-weight: 600; cursor: pointer; transition: all var(--transition); border: none; text-align: center; }
.btn-primary { background: var(--orange); color: var(--white); }
.btn-primary:hover { background: var(--orange-dark); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(245,130,32,0.35); }
.btn-outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }
.btn-full { width: 100%; }

/* ——— Triple Cards (About) ——— */
.triple-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 60px; }
.quad-cards { grid-template-columns: repeat(4, 1fr); }
.quad-cards .triple-card { padding: 32px 20px; }
.quad-cards .triple-card p { font-size: 14px; }
.triple-card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 40px 28px; text-align: center;
  transition: all var(--transition);
}
.triple-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--orange); }
.triple-icon { font-size: 32px; color: var(--orange); margin-bottom: 20px; }
.triple-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.triple-card p { font-size: 15px; color: var(--text-2); line-height: 1.6; }
.triple-card p small { color: var(--text-3); font-size: 13px; }

/* ——— About Intro ——— */
.about-intro { max-width: 800px; margin: 0 auto; }
.about-text p { font-size: 16px; color: var(--text-2); margin-bottom: 16px; line-height: 1.8; }
.about-text strong { color: var(--text); }
.about-founder { font-size: 15px !important; color: var(--text-3) !important; padding-top: 12px; border-top: 1px solid var(--line); }

.origin-panel {
  margin-top: 64px; padding: 40px 44px; border-radius: var(--radius);
  background: var(--dark); color: var(--white); position: relative; overflow: hidden;
}
.origin-panel::after {
  content: ''; position: absolute; width: 300px; height: 300px; right: -120px; top: -160px;
  border-radius: 50%; background: radial-gradient(circle, rgba(245,130,32,0.18), transparent 68%);
}
.origin-kicker { color: var(--orange); font-size: 12px; font-weight: 700; letter-spacing: 4px; margin-bottom: 22px; }
.origin-content { display: grid; grid-template-columns: 0.8fr 1.6fr; gap: 56px; position: relative; z-index: 1; }
.origin-content h3 { font-size: 26px; line-height: 1.45; }
.origin-copy p { color: rgba(255,255,255,0.68); line-height: 1.8; }
.origin-copy .origin-belief { margin-top: 18px; padding-left: 18px; border-left: 3px solid var(--orange); color: rgba(255,255,255,0.9); font-weight: 500; }

/* ——— Belief Highlight ——— */
.belief-highlight {
  max-width: 700px; margin: 0 auto 48px; text-align: center;
  padding: 32px 40px; background: var(--orange-light); border-radius: var(--radius);
  border-left: 4px solid var(--orange); position: relative;
}
.belief-label {
  font-size: 12px; font-weight: 700; letter-spacing: 3px;
  color: var(--orange); text-transform: uppercase; margin-bottom: 12px;
}
.belief-text {
  font-size: 18px; line-height: 1.7; color: var(--text); font-weight: 500;
}

/* ——— Ecosystem Model Screen 3 ——— */
.eco-model { margin-top: 20px; }

.eco-axis {
  display: flex; align-items: center; justify-content: center;
  gap: 0; position: relative; margin-bottom: 48px;
}

.eco-node { text-align: center; flex: 0 0 260px; }
.eco-node-label { font-size: 14px; font-weight: 600; letter-spacing: 2px; color: var(--orange); margin-bottom: 16px; display: block; text-transform: uppercase; }
.eco-node-body { display: flex; flex-direction: column; gap: 10px; }
.eco-tag {
  padding: 10px 20px; border-radius: 24px;
  font-size: 14px; font-weight: 500;
  background: rgba(245,130,32,0.15); color: var(--orange); border: 1px solid rgba(245,130,32,0.25);
}
.eco-tag-alt { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.9); border-color: rgba(255,255,255,0.15); }

.eco-center {
  flex: 0 0 280px; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  position: relative;
}
.eco-logo-ring {
  width: 100px; height: 100px; border-radius: 50%;
  background: var(--orange); display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  color: var(--white); font-weight: 700; font-size: 16px;
  box-shadow: 0 0 40px rgba(245,130,32,0.4);
}
.eco-logo-ring small { font-size: 11px; font-weight: 400; opacity: 0.85; }

.eco-path {
  font-size: 13px; font-weight: 600; padding: 6px 16px; border-radius: 16px;
  letter-spacing: 1px;
}
.eco-path-a { background: rgba(245,130,32,0.15); color: var(--orange); }
.eco-path-b { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); }

.eco-support {
  display: flex; justify-content: center; gap: 40px; margin-top: 24px;
  padding-top: 32px; border-top: 1px solid var(--line-dark);
}
.eco-support-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: rgba(255,255,255,0.6);
}
.eco-support-icon { color: var(--orange); font-size: 18px; }
.eco-support-note { text-align: center; font-size: 13px; color: rgba(255,255,255,0.35); margin-top: 12px; }

/* ——— Business Grid Screen 4 ——— */
.biz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 60px; }
.biz-card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 40px 32px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.biz-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(245,130,32,0.35); }
.biz-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--orange); transform: scaleX(0); transition: transform var(--transition);
}
.biz-card:hover::before { transform: scaleX(1); }

.biz-num { font-size: 13px; font-weight: 700; color: var(--orange); letter-spacing: 2px; margin-bottom: 16px; }
.biz-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.biz-card p { font-size: 15px; color: var(--text-2); line-height: 1.7; margin-bottom: 20px; }
.biz-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.biz-tags li {
  font-size: 12px; font-weight: 500; color: var(--orange-dark);
  background: var(--orange-light); padding: 4px 12px; border-radius: 12px;
}

.biz-principles { margin-top: 20px; }
.principles-title {
  text-align: center; font-size: 18px; font-weight: 700; color: var(--text);
  margin-bottom: 24px; letter-spacing: 1px;
}
.principles-title::before,
.principles-title::after {
  content: '—'; color: var(--orange); margin: 0 12px; font-weight: 400;
}
#principleContainer { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.principle-item {
  flex: 1; min-width: 240px; text-align: center;
  background: var(--orange-light); border-radius: var(--radius); padding: 24px;
  border-left: 4px solid var(--orange);
}
.principle-item strong { display: block; font-size: 16px; font-weight: 700; color: var(--orange-dark); margin-bottom: 6px; }
.principle-item span { font-size: 14px; color: var(--text-2); }

/* ——— Methodology Chain Screen 5 ——— */
.chain {
  display: flex; align-items: flex-start; justify-content: center;
  gap: 0; flex-wrap: wrap;
}
.chain-step {
  text-align: center; flex: 0 0 160px; padding: 0 8px;
  display: flex; flex-direction: column; align-items: center;
}
.chain-num {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(255,255,255,0.2); color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 700; margin-bottom: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  transition: all var(--transition);
}
.chain-step:hover .chain-num {
  background: var(--white); color: var(--orange);
  transform: scale(1.1);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.chain-step h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.chain-step p { font-size: 13px; opacity: 0.85; line-height: 1.6; }

.chain-arrow {
  font-size: 28px; color: rgba(255,255,255,0.4);
  display: flex; align-items: flex-start; padding-top: 10px;
  flex: 0 0 40px; justify-content: center;
}

.capability-block {
  display: grid; grid-template-columns: 0.85fr 1.65fr; gap: 64px;
  margin-top: 72px; padding-top: 56px; border-top: 1px solid rgba(255,255,255,0.22);
}
.capability-intro > span { font-size: 12px; font-weight: 700; letter-spacing: 3px; opacity: 0.7; }
.capability-intro h3 { margin: 12px 0 16px; font-size: 26px; line-height: 1.45; }
.capability-intro p { color: rgba(255,255,255,0.75); font-size: 14px; line-height: 1.8; }
.capability-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.capability-item { padding: 24px; border: 1px solid rgba(255,255,255,0.2); border-radius: var(--radius); background: rgba(255,255,255,0.08); }
.capability-item strong { display: block; margin-bottom: 8px; font-size: 16px; }
.capability-item p { color: rgba(255,255,255,0.72); font-size: 13px; line-height: 1.7; }

/* ——— Case Grid Screen 6 ——— */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; }
.case-card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 28px;
  transition: all var(--transition); display: flex; flex-direction: column;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-tag {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 1px;
  color: var(--orange-dark); background: var(--orange-light);
  padding: 4px 12px; border-radius: 12px; margin-bottom: 16px;
}
.case-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; line-height: 1.4; }
.case-card p { font-size: 14px; color: var(--text-2); line-height: 1.7; margin-bottom: 16px; flex: 1; }
.case-link { font-size: 14px; font-weight: 600; color: var(--orange); cursor: pointer; }
.case-link:hover { text-decoration: underline; }
.case-link-static { color: var(--text-3); cursor: default; }
.case-link-static:hover { text-decoration: none; }

.section-cta { text-align: center; }
.section-cta-note {
  max-width: 760px; margin: 56px auto 0; padding-top: 28px;
  border-top: 1px solid var(--line);
}
.section-cta-note p { color: var(--text-2); margin-bottom: 10px; }
.text-link { color: var(--orange-dark); font-weight: 700; }
.text-link span { display: inline-block; transition: transform var(--transition); }
.text-link:hover span { transform: translateX(4px); }
.section-cta-dark { margin-top: 56px; }
.section-cta-dark p { margin-bottom: 20px; color: rgba(255,255,255,0.75); }

/* ——— Insights Screen ——— */
.research-filters { display: flex; justify-content: center; gap: 10px; margin: -20px 0 32px; }
.research-filter {
  padding: 8px 18px; border: 1px solid rgba(245,130,32,0.25); border-radius: 22px;
  background: rgba(255,255,255,0.7); color: var(--text-2); cursor: pointer;
  font: inherit; font-size: 13px; font-weight: 600; transition: all var(--transition);
}
.research-filter:hover { border-color: var(--orange); color: var(--orange-dark); }
.research-filter.is-active { background: var(--orange); border-color: var(--orange); color: var(--white); }
.insight-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 48px; }
.insight-card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 28px;
  transition: all var(--transition); display: flex; flex-direction: column;
}
.insight-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-left: 4px solid var(--orange); }
.insight-series { font-size: 12px; font-weight: 600; letter-spacing: 2px; color: var(--orange); margin-bottom: 12px; }
.insight-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }
.insight-card p { font-size: 14px; color: var(--text-2); line-height: 1.6; margin-bottom: 14px; flex: 1; }
.research-card-case { background: rgba(255,255,255,0.72); }
.content-empty { color: var(--text-3); text-align: center; grid-column: 1 / -1; padding: 48px 20px; }

.insight-qr { text-align: center; margin-top: 48px; }
.qr-box {
  display: inline-block;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: #fff;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
.qr-box:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.qr-box img { display: block; width: 168px; height: 168px; object-fit: contain; border-radius: 4px; }
.insight-qr p { margin-top: 14px; font-size: 14px; color: var(--text-2); line-height: 1.6; }
.insight-qr .qr-tag { color: var(--orange); font-weight: 700; letter-spacing: 1px; }

/* ——— Stakeholder Principles ——— */
.screen-stakeholders { min-height: auto; }
.stakeholder-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stakeholder-card {
  padding: 28px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--white); transition: all var(--transition);
}
.stakeholder-card:hover { transform: translateY(-3px); border-color: rgba(245,130,32,0.45); box-shadow: var(--shadow); }
.stakeholder-card > span { display: block; color: var(--orange); font-size: 12px; font-weight: 700; letter-spacing: 2px; margin-bottom: 14px; }
.stakeholder-card h3 { font-size: 17px; margin-bottom: 10px; }
.stakeholder-card p { color: var(--text-2); font-size: 14px; line-height: 1.7; }
.stakeholder-principles {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 12px 28px;
  margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--line);
}
.stakeholder-principles span { color: var(--text-2); font-size: 13px; }
.stakeholder-principles span::before { content: '◇'; color: var(--orange); margin-right: 8px; }

/* 联系我们屏里的二维码 */
.contact-qr { padding: 24px 0 0; border-top: 1px solid rgba(255,255,255,.08); }
.contact-qr .qr-box { border-color: rgba(255,255,255,.18); background: #fff; }
.contact-qr-tip { margin-top: 14px; color: rgba(255,255,255,.6); font-size: 14px; line-height: 1.6; }
.contact-qr-tip span { color: var(--orange); font-weight: 600; letter-spacing: 1px; }

/* 双二维码并排 */
.contact-qr-dual { display: flex; gap: 32px; flex-wrap: wrap; }
.contact-qr-dual .qr-item { text-align: center; }
.contact-qr-dual .qr-item .qr-box img { width: 140px; height: 140px; }
@media (max-width: 768px) {
  .contact-qr-dual { justify-content: center; gap: 24px; }
}

/* ——— Contact Screen 7 ——— */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; margin-top: 40px; }

.contact-info { display: flex; flex-direction: column; gap: 32px; }
.contact-item h4 { font-size: 14px; font-weight: 600; letter-spacing: 2px; color: var(--orange); margin-bottom: 8px; text-transform: uppercase; }
.contact-item p { font-size: 15px; color: rgba(255,255,255,0.7); line-height: 1.8; }

.contact-form {
  background: rgba(255,255,255,0.06); border: 1px solid var(--line-dark);
  border-radius: var(--radius); padding: 40px 36px;
}
.contact-form h3 { font-size: 20px; font-weight: 700; margin-bottom: 28px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { margin-bottom: 20px; grid-column: 1 / -1; }
.form-group label { font-size: 13px; font-weight: 600; color: rgba(255,255,255,0.7); }
.required { color: var(--orange); }
.form-group input,
.form-group textarea {
  padding: 12px 16px; border: 1px solid var(--line-dark); border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05); color: var(--white); font-size: 15px;
  font-family: inherit; transition: border var(--transition);
}
.form-group input:focus,
.form-group textarea:focus { outline: none; border-color: var(--orange); }
.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(255,255,255,0.2); }

.form-note { margin-top: 16px; font-size: 12px; color: rgba(255,255,255,0.3); text-align: center; }
.form-status { min-height: 24px; margin-top: 10px; text-align: center; font-size: 13px; color: rgba(255,255,255,0.75); }
.form-status.is-success { color: #72d9b4; }
.form-status.is-error { color: #ff9a98; }

/* ——— Footer ——— */
.site-footer {
  background: var(--dark-2); color: rgba(255,255,255,0.5);
  border-top: 1px solid var(--line-dark);
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 60px 32px 32px;
}
.footer-brand { text-align: center; margin-bottom: 40px; }
.footer-logo { height: 56px; width: auto; max-width: none; margin: 0 auto 12px; filter: brightness(0) invert(1); opacity: 0.7; }
.footer-brand p { font-size: 15px; letter-spacing: 2px; }

.footer-links { display: flex; justify-content: space-between; gap: 40px; margin-bottom: 40px; flex-wrap: wrap; }
.footer-col { flex: 1; min-width: 160px; }
.footer-col h4 { font-size: 14px; font-weight: 600; color: rgba(255,255,255,0.6); margin-bottom: 16px; }
.footer-col a, .footer-col span { display: block; font-size: 14px; color: rgba(255,255,255,0.35); padding: 4px 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--orange); }

.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--line-dark); font-size: 13px; }
.footer-bottom p { margin: 4px 0; }
.footer-beian { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; opacity: 0.7; }

/* ——— Animations ——— */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
  50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

.fade-in { animation: fadeInUp 0.7s ease both; }

/* ——— Responsive ——— */
@media (max-width: 1024px) {
  .hero-title { font-size: 38px; }
  .hero-roles { font-size: 30px; white-space: normal; line-height: 1.45; }
  .section-title { font-size: 30px; }
  .chain { flex-direction: column; align-items: center; }
  .chain-arrow { transform: rotate(90deg); padding-top: 8px; }
  .eco-axis { flex-direction: column; gap: 32px; }
  .eco-node { flex: none; }
  .insight-grid { grid-template-columns: 1fr; }
  .research-filters { margin-top: -12px; overflow-x: auto; justify-content: flex-start; padding: 2px 0 6px; }
  .research-filter { flex: 0 0 auto; }
  .quad-cards { grid-template-columns: repeat(2, 1fr); }
  .stakeholder-grid { grid-template-columns: repeat(2, 1fr); }
  .capability-block { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
    background: var(--white); padding: 20px; gap: 8px;
    box-shadow: var(--shadow-lg); border-bottom: 1px solid var(--line);
  }
  .nav-links.open a { display: block; padding: 10px 8px; }
  .nav-links.open .nav-cta-link { text-align: center; margin-top: 6px; }
  .menu-toggle { display: flex; }
  body.menu-open { overflow: hidden; }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }

  .hero-title { font-size: 30px; }
  .hero-roles { font-size: 22px; white-space: normal; line-height: 1.55; margin-top: 10px; }
  .hero-desc { font-size: 16px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .hero-btns .btn { width: min(280px, 100%); }
  .hero-focus { flex-wrap: wrap; row-gap: 8px; margin-top: 36px; font-size: 12px; letter-spacing: 1px; }
  .hero-focus span + span::before { width: 14px; margin: 0 10px; }

  .triple-cards { grid-template-columns: 1fr; }
  .quad-cards { grid-template-columns: 1fr; }
  .origin-panel { margin-top: 48px; padding: 30px 24px; }
  .origin-content { grid-template-columns: 1fr; gap: 24px; }
  .origin-content h3 { font-size: 22px; }

  .eco-support { flex-direction: column; align-items: center; gap: 14px; }
  .eco-support-note { max-width: 340px; margin-left: auto; margin-right: auto; line-height: 1.7; }

  .biz-grid { grid-template-columns: 1fr; }
  #principleContainer { flex-direction: column; }

  .chain { flex-direction: column; align-items: center; }
  .chain-arrow { transform: rotate(90deg); padding-top: 0; }
  .chain-step { flex: none; }
  .capability-block { margin-top: 48px; padding-top: 40px; }
  .capability-list { grid-template-columns: 1fr; }

  .case-grid { grid-template-columns: 1fr; }
  .insight-grid { grid-template-columns: 1fr; }
  .stakeholder-grid { grid-template-columns: 1fr; }
  .stakeholder-card { padding: 24px; }

  .contact-wrapper { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }

  .section-container { padding: 60px 20px; }
  .section-title { font-size: 26px; }
  .section-header { margin-bottom: 40px; }
  .section-cta-note, .section-cta-dark { margin-top: 40px; }

  .nav-logo .logo-img { height: 54px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ——— 文章详情模态框 ——— */
.article-modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.6); z-index: 9999;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 20px; overflow-y: auto;
  animation: modalFadeIn 0.25s ease;
}
@keyframes modalFadeIn { from { opacity: 0; } to { opacity: 1; } }

.article-modal {
  background: #fff; border-radius: 12px; max-width: 720px; width: 100%;
  margin: auto; position: relative; box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  animation: modalSlideUp 0.3s ease;
}
@keyframes modalSlideUp { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.article-modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px; border-radius: 50%; border: none;
  background: #f5f5f5; color: #666; font-size: 22px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, color 0.2s; z-index: 10;
}
.article-modal-close:hover { background: var(--orange); color: #fff; }

.article-modal-body { padding: 48px 48px 40px; }

.article-modal-series {
  display: inline-block; font-size: 12px; color: var(--orange);
  background: var(--orange-light); padding: 4px 12px; border-radius: 20px;
  margin-bottom: 16px; font-weight: 600; letter-spacing: 0.5px;
}
.article-modal-title {
  font-size: 26px; font-weight: 700; color: var(--text);
  line-height: 1.4; margin-bottom: 32px; padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.article-modal-content { font-size: 16px; color: var(--text-2); line-height: 1.9; }
.article-modal-content h3 {
  font-size: 18px; font-weight: 700; color: var(--text);
  margin: 28px 0 12px; padding-left: 12px; border-left: 3px solid var(--orange);
}
.article-modal-content p { margin-bottom: 16px; }
.article-modal-content strong { color: var(--text); font-weight: 700; }
.article-modal-content ul, .article-modal-content ol { margin: 12px 0 16px 20px; }
.article-modal-content li { margin-bottom: 6px; }
.article-modal-content img { max-width: 100%; border-radius: 8px; margin: 16px 0; }
.article-modal-content blockquote {
  border-left: 4px solid var(--orange); background: var(--orange-light);
  padding: 16px 20px; margin: 16px 0; border-radius: 0 8px 8px 0;
  color: var(--text-2);
}
.article-modal-content table {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px;
}
.article-modal-content th, .article-modal-content td {
  border: 1px solid var(--line); padding: 8px 12px; text-align: left;
}
.article-modal-content th {
  background: var(--orange-light); color: var(--text); font-weight: 700;
}
.article-modal-content tr:nth-child(even) { background: rgba(0,0,0,0.02); }
.article-modal-content h1, .article-modal-content h2 {
  font-size: 18px; color: var(--text); margin: 24px 0 12px; font-weight: 700;
}

.article-modal-footer {
  margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--line);
  text-align: center;
}

/* 可点击的文章卡片样式 */
.insight-card-clickable { cursor: pointer; transition: transform 0.2s, box-shadow 0.2s; }
.insight-card-clickable:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(245,130,32,0.15);
  border-color: var(--orange);
}

@media (max-width: 768px) {
  .article-modal-overlay { padding: 20px 12px; }
  .article-modal-body { padding: 32px 24px 28px; }
  .article-modal-title { font-size: 20px; margin-bottom: 20px; }
  .article-modal-content { font-size: 15px; line-height: 1.8; }
}