:root {
  --bg-primary: #F9F9F7;
  --bg-card: #FFFFFF;
  --text-main: #1C2421;
  --text-muted: #5C6763;
  --brand-green: #1B4D3E;
  --brand-green-hover: #133A2E;
  --brand-green-light: #EBF3F0;
  --accent-gold: #C29B38;
  --border-color: #E6EAE8;
  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-sm: 0 2px 8px rgba(28, 36, 33, 0.04);
  --shadow-md: 0 8px 24px rgba(28, 36, 33, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #121715;
    --bg-card: #1B2320;
    --text-main: #EDEFEF;
    --text-muted: #96A39F;
    --brand-green: #2B6B57;
    --brand-green-hover: #3A876F;
    --brand-green-light: #1D2E28;
    --accent-gold: #D6AF4E;
    --border-color: #283430;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* Header & Nav */
header.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-green), #0F2D24);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-weight: 700;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(27, 77, 62, 0.3);
}

.brand-text h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-text p {
  font-size: 12px;
  color: var(--text-muted);
}

nav.nav-links a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Document & Card Container */
.doc-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.doc-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.doc-date {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.doc-content h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin: 32px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-content h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background-color: var(--brand-green);
  border-radius: 2px;
}

.doc-content p {
  margin-bottom: 16px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.doc-content ul {
  margin: 0 0 20px 24px;
  color: var(--text-muted);
  font-size: 15px;
}

.doc-content li {
  margin-bottom: 8px;
}

.highlight-box {
  background-color: var(--brand-green-light);
  border-left: 4px solid var(--brand-green);
  padding: 16px 20px;
  border-radius: 4px var(--radius-md) var(--radius-md) 4px;
  margin: 24px 0;
  font-size: 14px;
  color: var(--text-main);
}

/* Home Landing Page Specifics */
.hero {
  text-align: center;
  padding: 40px 0 60px;
}

.hero-tag {
  display: inline-block;
  background: var(--brand-green-light);
  color: var(--brand-green);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.25;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.badge-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.feature-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.feature-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--text-main);
}

.feature-item p {
  font-size: 14px;
  color: var(--text-muted);
}

/* Footer */
footer.footer {
  margin-top: 60px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

footer.footer a {
  color: var(--brand-green);
  text-decoration: none;
  margin: 0 8px;
}