/* ═══════════════════════════════════════════════════
   CistancheUSA.com — Main Stylesheet
   Modern, clean, mobile-first design
   ═══════════════════════════════════════════════════ */

/* ── CSS Custom Properties ── */
:root {
  --color-primary: #2C5530;
  --color-primary-hover: #1E3A21;
  --color-accent: #4a6741;
  --color-accent-hover: #5e7b55;
  --color-cta: #FF6900;
  --color-cta-hover: #E05A00;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-bg: #ffffff;
  --color-bg-alt: #F5F7F5;
  --color-bg-green: #E8F0E8;
  --color-bg-cream: #FFF9E6;
  --color-bg-dark: #2C5530;
  --color-bg-footer: #1a3320;
  --color-border: #e5e7eb;
  --color-white: #ffffff;

  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-heading: 'Space Grotesk', system-ui, -apple-system, sans-serif;

  --max-width: 1100px;
  --max-content: 800px;
  --header-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-header: 0 2px 8px rgba(0,0,0,0.08);

  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-hover); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(32px, 5vw, 44px); }
h2 { font-size: clamp(24px, 4vw, 32px); }
h3 { font-size: clamp(18px, 3vw, 22px); }

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.5em; }

/* ── Utilities ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 20px;
}
@media (min-width: 768px) {
  .container { padding-inline: 40px; }
}

.content-narrow {
  max-width: var(--max-content);
  margin-inline: auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--color-cta);
  color: var(--color-white) !important;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  padding: 16px 32px;
  border-radius: var(--radius);
  text-decoration: none !important;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  line-height: 1.2;
}
.btn:hover {
  background: var(--color-cta-hover);
  color: var(--color-white) !important;
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(255, 105, 0, 0.3);
}
.btn:active {
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg);
  height: var(--header-height);
  transition: box-shadow var(--transition);
}
.site-header.is-scrolled {
  box-shadow: var(--shadow-header);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.logo-img {
  height: 40px;
  width: auto;
}
@media (min-width: 768px) {
  .logo-img { height: 48px; }
}

/* Desktop Nav */
.desktop-nav {
  display: none;
  list-style: none;
  gap: 32px;
  padding: 0;
  margin: 0;
}
@media (min-width: 768px) {
  .desktop-nav { display: flex; }
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
  text-decoration: none;
  padding: 8px 0;
  position: relative;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link.is-active {
  color: var(--color-primary);
}
.nav-link:hover::after,
.nav-link.is-active::after {
  width: 100%;
}

/* Hamburger */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
@media (min-width: 768px) {
  .menu-toggle { display: none; }
}
.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile Menu Overlay */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}
.menu-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* Mobile Menu Panel */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100vh;
  height: 100dvh;
  background: var(--color-bg);
  z-index: 999;
  padding: 80px 24px 24px;
  transition: right var(--transition);
  overflow-y: auto;
}
.mobile-menu.is-open {
  right: 0;
}

.mobile-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.mobile-nav li {
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav-link {
  display: block;
  padding: 16px 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 17px;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}
.mobile-nav-link:hover,
.mobile-nav-link.is-active {
  color: var(--color-primary);
}

/* ═══════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════ */
.hero {
  background: linear-gradient(135deg, #2D372D 0%, #1E2A1E 100%);
  color: var(--color-white);
  padding: 48px 0;
}
@media (min-width: 768px) {
  .hero { padding: 60px 0; }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
@media (min-width: 768px) {
  .hero-grid { grid-template-columns: 60% 40%; gap: 40px; }
}

.hero h1 { color: var(--color-white); margin-bottom: 20px; }

.hero-text {
  color: #E8F0E8;
  font-size: 18px;
  max-width: 800px;
}

.hero-checks {
  font-size: 16px;
  color: #E8F0E8;
  line-height: 2;
  margin-top: 4px;
}

.hero-cta { margin-top: 28px; }

.hero-image {
  text-align: center;
  order: -1;
}
@media (min-width: 768px) {
  .hero-image { order: 0; }
}
.hero-image img {
  max-width: 300px;
  margin-inline: auto;
  border-radius: var(--radius-lg);
}

/* ═══════════════════════════════════════════════════
   META BAR
   ═══════════════════════════════════════════════════ */
.meta-bar {
  background: var(--color-bg);
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (min-width: 768px) {
  .meta-grid { grid-template-columns: repeat(4, 1fr); gap: 20px; }
}

.meta-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
.meta-value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
}
.meta-value a {
  font-weight: 600;
  text-decoration: none;
}
.meta-check {
  color: var(--color-primary);
  font-weight: 700;
}

/* ═══════════════════════════════════════════════════
   SECTIONS
   ═══════════════════════════════════════════════════ */
.section {
  padding: 48px 0;
}
@media (min-width: 768px) {
  .section { padding: 60px 0; }
}

.section--alt { background: var(--color-bg-alt); }
.section--green { background: var(--color-bg-green); }
.section--cream { background: var(--color-bg-cream); }

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-white);
}
.section--dark h2 { color: var(--color-white); }

.section--footer-dark {
  background: var(--color-bg-footer);
  color: #E8F0E8;
}

/* Content sections with lazy rendering */
.section:nth-of-type(n+4) {
  content-visibility: auto;
  contain-intrinsic-block-size: auto 500px;
}

/* ═══════════════════════════════════════════════════
   LOGOS BAR
   ═══════════════════════════════════════════════════ */
.logos-bar {
  background: #f8f9fa;
  padding: 24px 0;
}
.logos-title {
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.logos-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
@media (min-width: 768px) {
  .logos-grid { gap: 40px; }
}
.logos-grid img {
  max-height: 24px;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: opacity var(--transition), filter var(--transition);
}
@media (min-width: 768px) {
  .logos-grid img { max-height: 30px; }
}
.logos-grid img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* ═══════════════════════════════════════════════════
   CONTENT
   ═══════════════════════════════════════════════════ */
.content h2 {
  margin-top: 0;
  margin-bottom: 20px;
}
.content h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}
.content p { margin-bottom: 16px; }

/* Snippet / Callout Box */
.snippet-box {
  background: var(--color-bg-green);
  border-left: 5px solid var(--color-primary);
  padding: 20px 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}
.snippet-box p {
  margin: 0;
  font-size: 15px;
  color: var(--color-primary-hover);
}

/* ═══════════════════════════════════════════════════
   THREE COLUMN GRID
   ═══════════════════════════════════════════════════ */
.three-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}
@media (min-width: 768px) {
  .three-col { grid-template-columns: repeat(3, 1fr); }
}

.three-col-item h3 {
  color: #E8F0E8;
  font-size: 18px;
  margin: 0 0 8px 0;
}
.three-col-item p {
  color: var(--color-white);
  font-size: 15px;
  margin: 0;
}

/* ═══════════════════════════════════════════════════
   FEATURE LIST
   ═══════════════════════════════════════════════════ */
.feature-list { margin: 24px 0; }

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}
.feature-item:last-child { border-bottom: none; }

.feature-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
  line-height: 1;
}

.feature-content h3 {
  color: var(--color-primary);
  margin: 0 0 8px 0;
  font-size: 18px;
}
.feature-content p {
  color: var(--color-text-light);
  font-size: 15px;
  margin: 0;
}

/* ═══════════════════════════════════════════════════
   FAQ
   ═══════════════════════════════════════════════════ */
.faq-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}
.faq-item:last-child { border-bottom: none; }

.faq-item h3 {
  color: var(--color-primary);
  margin-bottom: 12px;
  font-size: 18px;
}
.faq-item p {
  color: var(--color-text-light);
  margin: 0;
}

/* ═══════════════════════════════════════════════════
   CTA BOX
   ═══════════════════════════════════════════════════ */
.cta-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 32px;
}
@media (min-width: 768px) {
  .cta-box { grid-template-columns: 60% 40%; }
}
.cta-box img {
  max-width: 100%;
  border-radius: var(--radius-lg);
}

.cta-checks {
  line-height: 2.2;
  margin-bottom: 8px;
}

/* ═══════════════════════════════════════════════════
   RELATED LINKS
   ═══════════════════════════════════════════════════ */
.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 24px;
}
@media (min-width: 768px) {
  .related-grid { grid-template-columns: repeat(3, 1fr); }
}

.related-col h3 {
  color: var(--color-primary);
  font-size: 16px;
  margin: 0 0 12px 0;
}
.related-col a {
  display: block;
  color: var(--color-primary);
  font-size: 15px;
  margin-bottom: 8px;
  text-decoration: none;
}
.related-col a:hover { text-decoration: underline; }

/* ═══════════════════════════════════════════════════
   CITATIONS
   ═══════════════════════════════════════════════════ */
#citations {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.citations h2 { margin-bottom: 20px; }

.citation-item {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-left: 32px;
  position: relative;
  line-height: 1.6;
}
.citation-num {
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}
.citation-item a {
  color: var(--color-primary);
}

/* ═══════════════════════════════════════════════════
   DISCLAIMER
   ═══════════════════════════════════════════════════ */
.disclaimer {
  background: var(--color-bg-cream);
  border-radius: var(--radius);
  padding: 24px;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 16px;
}
.disclaimer:last-child { margin-bottom: 0; }

.disclaimer h3 {
  color: var(--color-text);
  font-size: 16px;
  margin: 0 0 12px 0;
}
.disclaimer p { margin-bottom: 12px; }
.disclaimer p:last-child { margin-bottom: 0; }

/* ═══════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════ */
.site-footer {
  background: var(--color-bg-footer);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 16px;
  margin-bottom: 12px;
}
.footer-col p,
.footer-col a {
  color: #c8d8c8;
  font-size: 14px;
  line-height: 1.8;
}
.footer-col a {
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  color: #a0b8a0;
  font-size: 14px;
  margin: 0;
}
.footer-bottom a {
  color: #c8d8c8;
  text-decoration: none;
  margin: 0 8px;
}
.footer-bottom a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

/* ═══════════════════════════════════════════════════
   PAGE-SPECIFIC: CONTENT PAGES
   ═══════════════════════════════════════════════════ */
.page-header {
  background: linear-gradient(135deg, #2D372D 0%, #1E2A1E 100%);
  padding: 48px 0;
  color: var(--color-white);
}
@media (min-width: 768px) {
  .page-header { padding: 60px 0; }
}
.page-header h1 {
  color: var(--color-white);
  margin-bottom: 12px;
}
.page-header p {
  color: #E8F0E8;
  font-size: 18px;
  max-width: 600px;
}

.page-content {
  padding: 48px 0;
}
@media (min-width: 768px) {
  .page-content { padding: 60px 0; }
}
.page-content h2 {
  margin-top: 40px;
  margin-bottom: 16px;
}
.page-content h2:first-child { margin-top: 0; }
.page-content h3 {
  margin-top: 28px;
  margin-bottom: 12px;
}
.page-content ul, .page-content ol {
  margin-bottom: 16px;
}
.page-content li {
  margin-bottom: 8px;
}

/* Contact form */
.contact-form {
  max-width: 600px;
  margin-top: 32px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--color-text);
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(44, 85, 48, 0.1);
}
.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Contact info cards */
.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 32px;
}
@media (min-width: 600px) {
  .contact-info { grid-template-columns: repeat(3, 1fr); }
}
.contact-card {
  background: var(--color-bg-green);
  padding: 24px;
  border-radius: var(--radius-lg);
  text-align: center;
}
.contact-card-icon {
  font-size: 28px;
  margin-bottom: 12px;
}
.contact-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}
.contact-card p,
.contact-card a {
  font-size: 15px;
  color: var(--color-text);
}

/* 404 page */
.page-404 {
  text-align: center;
  padding: 80px 0;
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.page-404 h1 {
  font-size: clamp(64px, 10vw, 120px);
  color: var(--color-bg-green);
  margin-bottom: 16px;
  line-height: 1;
}
.page-404 h2 {
  margin-bottom: 16px;
}
.page-404 p {
  color: var(--color-text-light);
  max-width: 500px;
  margin-bottom: 24px;
}

/* ═══════════════════════════════════════════════════
   ACCESSIBILITY
   ═══════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px 16px;
  border-radius: var(--radius);
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}
.skip-link:focus {
  top: 8px;
}