/* ===== OPCBoss V1.0 Design System ===== */
/* 基于官网建设规范 V1.0 — 最终上线版 · 机构品牌优先 + SEO/GEO */

:root {
  /* 主色：深森林青绿 */
  --color-primary: #1F5A46;
  --color-primary-dark: #174a38;
  --color-primary-light: #2C6B52;
  --color-primary-bg: rgba(31, 90, 70, 0.06);
  --color-primary-border: rgba(31, 90, 70, 0.12);

  /* 强调色：实战橙 */
  --color-accent: #E86A33;
  --color-accent-hover: #d55a22;
  --color-accent-bg: rgba(232, 106, 51, 0.08);
  --color-accent-border: rgba(232, 106, 51, 0.2);

  /* 背景色 */
  --color-bg-warm: #F7F5F0;
  --color-bg-white: #FFFFFF;
  --color-bg-card: #FFFFFF;
  --color-bg-subtle: #EEECE6;

  /* 文字色 */
  --color-text-primary: #2F3437;
  --color-text-secondary: #4A5055;
  --color-text-muted: #7A8288;

  /* 功能色 */
  --color-success: #2E7D56;
  --color-warning: #D4940A;

  /* 阴影 — 低动效风格，只用轻阴影 */
  --shadow-xs: 0 1px 3px rgba(47, 52, 55, 0.04);
  --shadow-sm: 0 2px 8px rgba(47, 52, 55, 0.06);
  --shadow-md: 0 4px 16px rgba(47, 52, 55, 0.08);
  --shadow-lg: 0 8px 30px rgba(47, 52, 55, 0.10);
  --shadow-card: 0 1px 3px rgba(47, 52, 55, 0.04), 0 4px 12px rgba(47, 52, 55, 0.04);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* 间距系统 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;

  /* 字体 */
  --font-cn: 'PingFang SC', 'Source Han Sans SC', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Microsoft YaHei', sans-serif;
  --font-en: 'Inter', 'Helvetica Neue', 'Helvetica', Arial, sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-cn);
  color: var(--color-text-secondary);
  background: var(--color-bg-warm);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.7;
  letter-spacing: 0.01em;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color 0.2s ease; }
button { border: none; cursor: pointer; font-family: inherit; }
ul, ol { list-style: none; }

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}
p { margin-bottom: var(--space-sm); }
p:last-child { margin-bottom: 0; }

.text-accent { color: var(--color-accent); }
.text-primary { color: var(--color-primary); }
.text-muted { color: var(--color-text-muted); }

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: all 0.25s ease;
  background: transparent;
}
.navbar.scrolled {
  background: rgba(247, 245, 240, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}
.nav-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
  transition: color 0.25s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.navbar.scrolled .nav-logo { color: var(--color-primary); }
/* ===== V1.0 Logo 原点系统 =====
 * 语义：一个经营单元 / 一个OPC起点 / 一个系统节点
 * 规则：圆形 + 内发光 + 微交互
 */
.nav-logo .logo-icon {
  width: 32px; height: 32px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  position: relative;
  box-shadow:
    inset 2px 2px 4px rgba(255,255,255,0.15),
    inset -1px -1px 3px rgba(0,0,0,0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.nav-logo:hover .logo-icon {
  transform: scale(1.08);
  box-shadow:
    inset 2px 2px 4px rgba(255,255,255,0.15),
    inset -1px -1px 3px rgba(0,0,0,0.2),
    0 0 12px rgba(31,90,70,0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  transition: all 0.2s ease;
  position: relative;
  padding: 4px 0;
}
.navbar.scrolled .nav-links a { color: var(--color-text-secondary); }
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
  border-radius: 1px;
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-cta {
  display: inline-block;
  padding: 9px 22px;
  background: var(--color-accent);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13.5px !important;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease !important;
}
.nav-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.nav-cta::after { display: none !important; }

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.mobile-toggle span {
  width: 22px; height: 2px;
  background: #fff;
  transition: all 0.25s ease;
  border-radius: 1px;
}
.navbar.scrolled .mobile-toggle span { background: var(--color-text-primary); }

@media (max-width: 800px) {
  .mobile-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 280px; height: 100vh;
    background: var(--color-bg-warm);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    padding: 40px;
    transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -8px 0 30px rgba(0,0,0,0.1);
  }
  .nav-links.open { right: 0; }
  .nav-links a {
    color: var(--color-text-primary) !important;
    font-size: 17px;
  }
  .nav-links a:hover,
  .nav-links a.active { color: var(--color-accent) !important; }
  .nav-cta {
    margin-top: 16px;
    padding: 13px 28px;
    font-size: 15px !important;
    text-align: center;
  }
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-primary);
  overflow: hidden;
}
/* V0.2: 绿色背景增加极轻网格纹理，增加实验室感/秩序感 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0.04;
  background-image:
    linear-gradient(rgba(255,255,255,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1160px;
  margin: 0 auto;
  padding: 120px var(--space-md) 100px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: var(--color-accent-bg);
  border: 1px solid var(--color-accent-border);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  letter-spacing: 0.3px;
}
.hero-title {
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}
.hero-title .highlight {
  color: var(--color-accent);
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.75;
  color: rgba(255,255,255,0.72);
  max-width: 600px;
  margin-bottom: var(--space-lg);
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ===== Buttons — V0.1 低动效风格 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 14.5px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  min-height: 48px;
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.btn-outline-light {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-outline-light:hover {
  border-color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.06);
}
.btn-outline-dark {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-bg-subtle);
}
.btn-outline-dark:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-bg);
}
.btn-dark {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-dark:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* ===== Bento Grid Layout ===== */
.bento-grid {
  display: grid;
  gap: var(--space-md);
}
.bento-grid--2 { grid-template-columns: repeat(2, 1fr); }
.bento-grid--3 { grid-template-columns: repeat(3, 1fr); }
.bento-grid--4 { grid-template-columns: repeat(4, 1fr); }
.bento-grid--mix {
  grid-template-columns: repeat(2, 1fr);
}
.bento-grid--mix .bento-card--wide {
  grid-column: span 2;
}
.bento-grid--mix .bento-card--tall {
  grid-row: span 2;
}

@media (max-width: 900px) {
  .bento-grid--3,
  .bento-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .bento-grid--mix .bento-card--wide { grid-column: span 1; }
  .bento-grid--mix .bento-card--tall { grid-row: span 1; }
}
@media (max-width: 600px) {
  .bento-grid--2,
  .bento-grid--3,
  .bento-grid--4,
  .bento-grid--mix { grid-template-columns: 1fr; }
}

/* ===== Bento Card — 核心组件 ===== */
.bento-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(47, 52, 55, 0.06);
  transition: box-shadow 0.25s ease;
  height: 100%;
  /* 低动效：只做阴影变化，不做位移或缩放 */
}
.bento-card:hover {
  box-shadow: var(--shadow-lg);
}
.bento-card--primary {
  background: var(--color-primary);
  color: #fff;
  border: none;
}
.bento-card--primary .bento-card-title,
.bento-card--primary .bento-card-desc { color: #fff; }
.bento-card--primary .bento-card-desc { color: rgba(255,255,255,0.75); }
.bento-card--warm {
  background: var(--color-bg-warm);
  border: 1px solid rgba(47, 52, 55, 0.05);
}

.bento-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: var(--space-sm);
  background: var(--color-primary-bg);
  color: var(--color-primary);
  flex-shrink: 0;
}
.bento-card--primary .bento-card-icon {
  background: rgba(255,255,255,0.15);
  color: #fff;
}
.bento-card-icon--accent {
  background: var(--color-accent-bg);
  color: var(--color-accent);
}
.bento-card-label {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.bento-card--primary .bento-card-label { color: var(--color-accent); }
.bento-card-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  line-height: 1.35;
}
.bento-card-desc {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
}
.bento-card-quote {
  font-size: clamp(17px, 2.5vw, 22px);
  font-weight: 600;
  line-height: 1.5;
  color: #fff;
  position: relative;
  padding-left: 20px;
  border-left: 3px solid var(--color-accent);
}
.bento-card-number {
  font-size: 42px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  opacity: 0.9;
  margin-bottom: 8px;
  font-family: var(--font-en);
}
/* ===== V1.0: 小圆点原点品牌符号系统（融合版第二章） =====
 * 核心语义：一个经营单元 / 一个OPC起点 / 一个可放大的系统节点
 * 气质原则：克制、稳定、可复制、有秩序
 *
 * 尺寸层级：
 *   dot-xs (6px)   — 列表点、分隔符
 *   dot-sm (10px)  — 文本前缀、标签点
 *   dot-md (16px)  — 模块节点、步骤编号
 *   dot-lg (32px)  — 结构节点、卡片图标、Logo
 *
 * 颜色规则：
 *   默认 = 深森林绿（系统与判断）
 *   强调 = 实战橙（行动与转化）
 *   弱化 = 灰色/浅绿（辅助与秩序）
 */
/* V0.2 基础圆圈 — 卡片编号、文章分段、视觉锚点、方法论节点 */
.brand-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  min-width: 32px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-en);
  flex-shrink: 0;
}
.brand-circle--sm { width: 24px; height: 24px; min-width: 24px; font-size: 11px; }
.brand-circle--outline { background: transparent; border: 2px solid var(--color-primary); color: var(--color-primary); }
.brand-circle--accent { background: var(--color-accent); }
.brand-circle--lg { width: 44px; height: 44px; min-width: 44px; font-size: 18px; }

/* V1.0: 原点符号 — 纯圆点无文字，用于列表/CTA前缀/分隔 */
.brand-dot {
  display: inline-block;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}
.brand-dot--xs { width: 6px; height: 6px; }
.brand-dot--sm { width: 10px; height: 10px; }
.brand-dot--md { width: 16px; height: 16px; }
.brand-dot--lg { width: 32px; height: 32px; }
.brand-dot--accent { background: var(--color-accent); }
.brand-dot--muted { background: rgba(31,90,70,0.2); }
.bento-card-stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
  font-family: var(--font-en);
}
.bento-card-stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ===== Sections Common ===== */
.section {
  padding: var(--space-2xl) var(--space-md);
  max-width: 1160px;
  margin: 0 auto;
}
.section--full {
  padding: var(--space-2xl) var(--space-md);
  max-width: 100%;
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.03em;
}
.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}
.divider-line {
  width: 40px; height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: 14px auto 0;
}

/* ===== Principle / Boundary Cards ===== */
.principle-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
@media (max-width: 650px) {
  .principle-cards { grid-template-columns: 1fr; }
}
.principle-card {
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.principle-card .principle-text {
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 600;
  line-height: 1.5;
  margin-top: var(--space-sm);
  position: relative;
  z-index: 1;
}
.principle-card .principle-text::before {
  content: '"';
  position: absolute;
  left: -16px;
  top: -8px;
  font-size: 48px;
  font-weight: 700;
  color: rgba(232, 106, 51, 0.25);
  font-family: Georgia, serif;
  line-height: 1;
}
.principle-card .principle-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-top: var(--space-sm);
  position: relative;
  z-index: 1;
}

/* ===== Service Lines (Three Columns) ===== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 850px) {
  .service-grid { grid-template-columns: 1fr; }
}
.service-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  margin-right: 10px;
  flex-shrink: 0;
  font-family: var(--font-en);
}

/* ===== Stats Bar ===== */
.stats-bar {
  background: var(--color-primary);
  padding: var(--space-xl) var(--space-md);
}
.stats-inner {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  text-align: center;
}
.stat-item .stat-number {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 6px;
  font-family: var(--font-en);
}
.stat-item .stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}
@media (max-width: 650px) {
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
}

/* ===== CTA Section ===== */
.cta-section {
  background: var(--color-primary);
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
}
.cta-section h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.cta-section p {
  font-size: 16px;
  color: rgba(255,255,255,0.68);
  margin-bottom: var(--space-lg);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* ===== Footer ===== */
.footer {
  background: #1A1E1C;
  color: rgba(255,255,255,0.45);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}
.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: var(--space-lg);
}
.footer-brand h3 {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}
.footer-brand p {
  font-size: 13.5px;
  line-height: 1.7;
  margin-top: 10px;
  max-width: 300px;
  color: rgba(255,255,255,0.4);
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.footer-col li { margin-bottom: 9px; }
.footer-col a {
  font-size: 13.5px;
  color: rgba(255,255,255,0.4);
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--color-accent); }

.footer-bottom {
  max-width: 1160px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.07);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12.5px;
}
@media (max-width: 800px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--space-md); }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
}
@media (max-width: 500px) {
  .footer-inner { grid-template-columns: 1fr; }
}

/* ===== Page Header (Inner Pages) ===== */
.page-header {
  background: var(--color-primary);
  padding: 130px var(--space-md) 70px;
  text-align: center;
}
.page-header h1 {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -0.03em;
}
.page-header p {
  font-size: 16px;
  color: rgba(255,255,255,0.65);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}
.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}
.breadcrumb a { color: rgba(255,255,255,0.55); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { color: var(--color-accent); }

/* ===== Timeline (Methodology page) ===== */
.timeline {
  position: relative;
  padding-left: 36px;
  max-width: 720px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 10px; top: 0; bottom: 0;
  width: 2px;
  background: var(--color-bg-subtle);
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px; top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2.5px solid var(--color-bg-warm);
  box-shadow: 0 0 0 3px var(--color-primary-bg);
}
.timeline-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.timeline-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}
.timeline-item p {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== Contact / Form ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-info-item {
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
}
.contact-info-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-bg);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-info-text h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 3px;
}
.contact-info-text p {
  font-size: 13.5px;
  color: var(--color-text-muted);
}

.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-family: inherit;
  color: var(--color-text-primary);
  background: var(--color-bg-white);
  transition: border-color 0.2s ease;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* ===== FAQ Accordion ===== */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--color-bg-subtle);
}
.faq-question {
  width: 100%;
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: color 0.2s;
}
.faq-question:hover { color: var(--color-primary); }
.faq-question::after {
  content: '+';
  font-size: 20px;
  font-weight: 300;
  color: var(--color-text-muted);
  transition: transform 0.25s;
}
.faq-item.open .faq-question::after {
  transform: rotate(45deg);
  color: var(--color-primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-answer-inner {
  padding: 0 0 18px;
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
}
.faq-item.open .faq-answer {
  max-height: 300px;
}

/* ===== Insight Article Cards ===== */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
@media (max-width: 700px) { .insight-grid { grid-template-columns: 1fr; } }
.insight-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(47, 52, 55, 0.05);
  transition: box-shadow 0.25s ease;
}
.insight-card:hover { box-shadow: var(--shadow-lg); }
.insight-card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.insight-card-title {
  font-size: 17.5px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}
.insight-card-excerpt {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 14px;
}
.insight-card-meta {
  font-size: 12.5px;
  color: var(--color-text-muted);
}

/* ===== Solution Scene Card ===== */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
@media (max-width: 700px) { .scene-grid { grid-template-columns: 1fr; } }
.scene-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  border-left: 3px solid var(--color-primary);
  transition: box-shadow 0.25s ease;
}
.scene-card:hover { box-shadow: var(--shadow-lg); }
.scene-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.scene-card-title .scene-icon {
  font-size: 24px;
  flex-shrink: 0;
}
.scene-card ul li {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}
.scene-card ul li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* ===== Comparison Table (Traditional vs OPC) ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-bg-subtle);
}
.compare-table th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.compare-table td:first-child {
  font-weight: 600;
  color: var(--color-text-primary);
  background: var(--color-bg-warm);
  width: 35%;
}
.compare-table tr:last-child td { border-bottom: none; }
@media (max-width: 650px) {
  .compare-table { font-size: 13px; }
  .compare-table th,
  .compare-table td { padding: 12px 14px; }
}

/* ===== Scroll to Top Button ===== */
.scroll-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 999;
  cursor: pointer;
}
.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}
.scroll-top:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
}

/* ===== Utility ===== */
.bg-warm { background: var(--color-bg-warm); }
.bg-white { background: var(--color-bg-white); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mb-sm { margin-bottom: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mb-md { margin-bottom: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ===== Low-motion Animation — 仅淡入 + 轻微上移 ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.delay-1 { transition-delay: 0.08s; }
.delay-2 { transition-delay: 0.16s; }
.delay-3 { transition-delay: 0.24s; }
.delay-4 { transition-delay: 0.32s; }
.delay-5 { transition-delay: 0.4s; }

/* ===== V0.3: 首屏经营控制台图形（实验室图纸风格） ===== */
.hero-visual {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: min(480px, 45vw);
  height: 480px;
  z-index: 2;
  opacity: 0.18;
  pointer-events: none;
}
@media (max-width: 1024px) {
  .hero-visual { display: none; }
}
/* 控制台图形 — 小圆点原点 + 四条延展线 */
.console-graph {
  width: 100%;
  height: 100%;
  position: relative;
}
.console-origin {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.9);
  border-radius: 50%;
  box-shadow: 0 0 40px rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-en);
}
.console-line {
  position: absolute;
  background: rgba(255,255,255,0.25);
  border-radius: 2px;
  transform-origin: left center;
}
/* 四条线：右上/右下/左下/左上 */
.console-line--t-r { width: 180px; height: 1.5px; left: calc(50%+28px); top: 50%; transform: rotate(-35deg); }
.console-line--r-b { width: 160px; height: 1.5px; left: calc(50%+28px); top: 50%; transform: rotate(30deg); }
.console-line--b-l { width: 140px; height: 1.5px; right: calc(50%+28px); bottom: 20%; transform: rotate(-145deg); }
.console-line--l-t { width: 150px; height: 1.5px; right: calc(50%+28px); top: 38%; transform: rotate(155deg); }

/* 线端节点（四个方法方向） */
.console-node {
  position: absolute;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.4);
  background: rgba(31,90,70,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #fff;
  white-space: nowrap;
  overflow: visible;
}
/* 节点标签 */
.console-node-label {
  position: absolute;
  font-size: 10px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
  font-family: var(--font-en);
  white-space: nowrap;
}
.console-node--ai { left: calc(50%+190px); top: calc(50%-70px); }
.console-node--emp { left: calc(50%+170px); top: calc(50%+55px); }
.console-node--flow { left: calc(50%-165px); top: calc(50%+75px); }
.console-node--result { left: calc(50%-175px); top: calc(50%-65px); }

.console-node--ai .console-node-label { top: -16px; left: 50%; transform: translateX(-50%); }
.console-node--emp .console-node-label { top: 18px; left: 50%; transform: translateX(-50%); }
.console-node--flow .console-node-label { top: 18px; left: 50%; transform: translateX(-50%); }
.console-node--result .console-node-label { top: -16px; left: 50%; transform: translateX(-50%); }

/* ===== V0.3: 感谢页样式 ===== */
.thanks-hero {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background: var(--color-primary);
  position: relative;
}
.thanks-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image:
    linear-gradient(rgba(255,255,255,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}
.thanks-icon {
  width: 72px; height: 72px;
  margin: 0 auto var(--space-md);
  background: rgba(232,106,51,0.15);
  border: 2px solid rgba(232,106,51,0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  line-height: 1;
}
.thanks-hero h1 {
  font-size: clamp(26px, 4vw, 38px);
  color: #fff;
  margin-bottom: var(--space-sm);
  font-weight: 700;
}
.thanks-hero p {
  font-size: clamp(15px, 2vw, 17.5px);
  color: rgba(255,255,255,0.68);
  max-width: 520px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
}
.thanks-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== V0.3: 线性图标（替代emoji，更像商业实验室风格） ===== */
.icon-linear {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  position: relative;
}
.icon-linear svg {
  width: 22px; height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== V1.0: 首屏小圆点原点主视觉（替代控制台图形，更强品牌感） ===== */
.dot-system {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* 外环光晕（三层） */
.dot-halo {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.12);
  pointer-events: none;
}
.dot-halo--1 { width: 100px; height: 100px; }
.dot-halo--2 { width: 180px; height: 180px; border-color: rgba(255,255,255,0.07); }
.dot-halo--3 { width: 280px; height: 280px; border-color: rgba(255,255,255,0.04); }
/* 中心实心原点 */
.dot-origin {
  position: relative;
  z-index: 10;
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-en);
  box-shadow:
    0 0 0 8px rgba(255,255,255,0.08),
    0 0 40px rgba(255,255,255,0.12);
}
/* 延展射线 */
.dot-ray {
  position: absolute;
  background: rgba(255,255,255,0.2);
  border-radius: 2px;
  transform-origin: center left;
}
.dot-ray--tr { width: 170px; height: 1.5px; left: calc(50% + 28px); top: 50%; transform: rotate(-35deg); }
.dot-ray--rb { width: 150px; height: 1.5px; left: calc(50% + 28px); top: 50%; transform: rotate(30deg); }
.dot-ray--bl { width: 135px; height: 1.5px; right: calc(50% + 28px); bottom: 25%; transform-origin: right center; transform: rotate(-145deg); }
.dot-ray--lt { width: 145px; height: 1.5px; right: calc(50% + 28px); top: 38%; transform-origin: right center; transform: rotate(155deg); }
/* 末端经营节点 */
.dot-node {
  position: absolute;
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.35);
  background: rgba(31,90,70,0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: rgba(255,255,255,0.85);
  white-space: nowrap;
  overflow: visible;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.dot-node::after {
  content: attr(class);
  display: none;
}
/* 节点文字用 data 或直接内联文字，已在HTML中写入 */
.dot-node--tr { left: calc(50% + 180px); top: calc(50% - 75px); }
.dot-node--rb { left: calc(50% + 160px); top: calc(50% + 58px); }
.dot-node--bl { left: calc(50% - 195px); top: calc(50% + 72px); }
.dot-node--lt { left: calc(50% - 185px); top: calc(50% - 62px); }
.dot-node .node-label {
  position: absolute;
  font-size: 9.5px;
  color: rgba(255,255,255,0.45);
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
  top: -15px; left: 50%;
  transform: translateX(-50%);
}

/* ===== V1.0: 从点到系统 — 方法路径组件 ===== */
.dot-path {
  max-width: 680px;
  margin: 0 auto;
}
.dot-path-step {
  display: flex;
  gap: var(--space-lg);
  position: relative;
}
.dot-path-step--last .dot-path-line { display: none; }
.dot-path-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 32px;
}
.dot-path-dot {
  width: 20px; height: 20px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 4px rgba(31,90,70,0.1);
}
.dot-path-dot--accent {
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(232,106,51,0.12);
}
.dot-path-dot--lg {
  width: 28px; height: 28px;
  background: var(--color-primary);
  box-shadow: 0 0 0 6px rgba(31,90,70,0.1);
}
.dot-path-line {
  flex: 1;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary-border), transparent);
  margin: 4px 0;
  min-height: 32px;
}
.dot-path-content {
  padding-bottom: var(--space-xl);
  flex: 1;
}
.dot-path-step--last .dot-path-content { padding-bottom: 0; }
.dot-path-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  font-family: var(--font-en);
}
.dot-path-content h3 {
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 10px;
  line-height: 1.3;
}
.dot-path-content p {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.8;
}
@media (max-width: 600px) {
  .dot-path-step { gap: var(--space-md); }
  .dot-path-content { padding-bottom: var(--space-lg); }
}

/* ===== V1.0: ICP 备案信息 ===== */
.footer-icp {
  text-align: center;
  margin-top: 24px;
  font-size: 12.5px;
  color: rgba(255,255,255,0.25);
}

/* ===== V1.0: 移动端 768px 首屏优化（融合版第三章-3） ===== */
/* 原则：手机端优先保证 标题清楚 / 副标题易读 / CTA按钮明显 */
@media (max-width: 768px) {
  .hero-content { padding: 80px var(--space-md) 60px; }
  .hero-title { font-size: clamp(28px, 7vw, 38px); }
  .hero-subtitle { font-size: clamp(14.5px, 3.5vw, 16.5px); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; text-align: center; justify-content: center; }
  /* 手机端控制台图形已在 1024px 隐藏，此处确保更小屏幕也无残留 */
  .hero-visual { display: none !important; }
}

/* ===== V1.0: 文章详情页样式（融合版第七章） ===== */
.article-hero {
  background: var(--color-bg-warm);
  padding: var(--space-xxl) var(--space-md) var(--space-xl);
}
.article-hero-inner {
  max-width: 720px;
  margin: 0 auto;
}
.article-title {
  font-size: clamp(26px, 4.5vw, 40px);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}
.article-excerpt {
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}
.article-meta {
  display: flex;
  align-items: center;
  font-size: 13.5px;
  color: var(--color-text-muted);
  gap: 6px;
}
/* 正文区域 */
.article-body {
  background: #fff;
}
.article-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-xxl) var(--space-md) var(--space-xxl);
}
.article-inner h2 {
  font-size: clamp(22px, 3.5vw, 28px);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: var(--space-xxl);
  margin-bottom: var(--space-md);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.article-inner h2:first-child { margin-top: 0; }
.article-inner h3 {
  font-size: clamp(17px, 2.5vw, 20px);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}
.article-inner p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}
.article-inner blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background: rgba(232,106,51,0.03);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.article-inner blockquote p {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text-primary);
  font-style: italic;
  margin: 0;
}
.article-inner ul,
.article-inner ol {
  padding-left: 22px;
  margin-bottom: var(--space-md);
}
.article-inner li {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}
/* 固定模块：甲叔判断 / OPCBoss方法 / 经营现场怎么做 */
.article-judgment,
.article-method,
.article-action {
  margin-top: var(--space-xxl);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid transparent;
}
.article-judgment {
  background: rgba(31,90,70,0.03);
  border-left-color: var(--color-accent);
}
.article-method {
  background: var(--color-bg-warm);
  border-left-color: var(--color-primary);
}
.article-action {
  background: rgba(232,106,51,0.03);
  border-left-color: var(--color-accent);
}
/* 文章底部 CTA */
.article-cta {
  margin-top: 0;
}
@media (max-width: 768px) {
  .article-hero { padding: var(--space-xl) var(--space-md) var(--space-lg); }
  .article-inner { padding: var(--space-xl) var(--space-md); }
  .article-inner h2 { margin-top: var(--space-xl); }
  .article-judgment, .article-method, .article-action { margin-top: var(--space-xl); padding: var(--space-md); }
}