:root {
  --ink: #0D1B1A;
  --ink-light: #1A2E2C;
  --paper: #FAFAF7;
  --paper-warm: #F5F3EE;
  --text: #1A1B1C;
  --text-secondary: #555;
  --text-muted: #888;
  --border: #E8E6E0;
  --border-light: #ECEAE3;
  --primary: #3A7D6C;
  --primary-light: #E8F2EF;
  --accent: #B8742A;
  --accent-light: #FDF6EC;
  --shadow: rgba(0,0,0,0.06);
  --shadow-hover: rgba(0,0,0,0.1);
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.25s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Segoe UI', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--paper);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }

/* ===== Navigation ===== */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,247,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 14px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand .logo-wrap {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.brand .logo-wrap img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
  line-height: 1.3;
}

.brand-tagline {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.3;
}

.nav-links {
  display: flex;
  gap: 36px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-links a {
  position: relative;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* ===== Hero (Dark) ===== */
.hero {
  background: var(--ink);
  color: #fff;
  text-align: center;
  padding: 100px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(58,125,108,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(184,116,42,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.hero-logo {
  width: 90px;
  height: 90px;
  margin: 0 auto 28px;
}

.hero-logo img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.hero h1 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero h1 em {
  font-style: normal;
  color: var(--primary);
}

.hero .tagline {
  font-size: 17px;
  color: rgba(255,255,255,0.72);
  max-width: 540px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  padding: 7px 16px;
  border-radius: 20px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  backdrop-filter: blur(4px);
}

/* ===== Sections ===== */
.section {
  max-width: 960px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section-header {
  margin-bottom: 36px;
}

.section-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title .icon {
  width: 6px;
  height: 28px;
  border-radius: 3px;
  background: var(--primary);
  display: inline-block;
}

.section-sub {
  color: var(--text-muted);
  font-size: 15px;
}

/* ===== Cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px;
  border: 1px solid var(--border-light);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px var(--shadow-hover);
}

.card .tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 6px;
  margin-bottom: 14px;
  font-weight: 600;
  align-self: flex-start;
}

.tag-mom { background: var(--primary-light); color: var(--primary); }
.tag-insight { background: var(--accent-light); color: var(--accent); }

.card h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text);
}

.card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.card .read-more {
  margin-top: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.card:hover .read-more {
  gap: 8px;
}

/* ===== Insight List ===== */
.insight-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.insight-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px 28px;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: block;
}

.insight-item:hover {
  transform: translateX(4px);
  box-shadow: 0 8px 24px var(--shadow);
}

.insight-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.insight-item p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== About ===== */
.about {
  background: #fff;
  border-radius: var(--radius);
  padding: 48px 36px;
  border: 1px solid var(--border-light);
  text-align: center;
}

.about h2 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
}

.about p {
  font-size: 15.5px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 12px;
  line-height: 1.8;
}

.about .email {
  margin-top: 20px;
  font-size: 15px;
  color: var(--primary);
  font-weight: 600;
}

/* ===== QR Section ===== */
.qr-section {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border-light);
}

.qr-box {
  width: 150px;
  height: 150px;
  margin: 0 auto 12px;
  border: 2px dashed #ccc;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: #aaa;
  text-align: center;
  background: var(--paper);
}

.qr-section p {
  font-size: 13.5px;
  color: var(--text-muted);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 40px 24px;
  font-size: 13px;
  color: #aaa;
  border-top: 1px solid var(--border-light);
  margin-top: 20px;
  background: var(--paper-warm);
}

/* ===== Article Page ===== */
.article-page {
  background: var(--paper);
  min-height: 100vh;
}

.article-header {
  background: var(--ink);
  color: #fff;
  padding: 80px 24px 50px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.article-header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(58,125,108,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.article-header-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.article-tag {
  display: inline-block;
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 20px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.8);
  margin-bottom: 20px;
}

.article-header h1 {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
}

.article-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px;
}

.article-body p {
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
  margin-bottom: 20px;
}

.article-body p.lead {
  font-size: 18px;
  color: var(--text-secondary);
  font-weight: 500;
}

.article-divider {
  width: 48px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  margin: 40px auto;
}

.article-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

.signature-box {
  background: var(--primary-light);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(58,125,108,0.1);
}

.signature-box p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.signature-box .brand-name-sig {
  font-weight: 700;
  color: var(--primary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition);
}

.back-link:hover {
  gap: 10px;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  nav {
    padding: 12px 18px;
  }
  
  .nav-links {
    gap: 16px;
    font-size: 13.5px;
  }
  
  .brand-tagline {
    display: none;
  }
  
  .hero {
    padding: 60px 20px 50px;
  }
  
  .hero h1 {
    font-size: 26px;
  }
  
  .hero .tagline {
    font-size: 15px;
  }
  
  .hero-logo {
    width: 72px;
    height: 72px;
  }
  
  .section {
    padding: 44px 18px;
  }
  
  .section-title {
    font-size: 22px;
  }
  
  .cards {
    grid-template-columns: 1fr;
  }
  
  .about {
    padding: 36px 24px;
  }
  
  .article-header {
    padding: 56px 20px 40px;
  }
  
  .article-header h1 {
    font-size: 24px;
  }
  
  .article-body {
    padding: 36px 20px;
  }
  
  .article-body p {
    font-size: 15.5px;
  }
}