/* VibeLeaf Design System */
:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #111114;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.12);

  --text-primary: #f0f0f0;
  --text-secondary: #a8a8a8;
  --text-muted: #6b6b6b;

  --accent-primary: #7CFFB2;
  --accent-secondary: #9cff6f;
  --accent-glow: rgba(124, 255, 178, 0.15);
  --link-color: #8ab4ff;

  --gradient-header: linear-gradient(135deg, rgba(124, 255, 178, 0.12) 0%, rgba(138, 180, 255, 0.08) 100%);
  --gradient-accent: linear-gradient(135deg, #7CFFB2 0%, #9cff6f 100%);

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

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(124, 255, 178, 0.1);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;

  --max-width: 920px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav-logo-img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.nav-link.active {
  color: var(--accent-primary);
  background: var(--accent-glow);
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--bg-card-hover);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 11, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px 16px;
  }
}

/* Main Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.container-narrow {
  max-width: 720px;
}

/* Hero Section (Homepage) */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-glow);
  border: 1px solid rgba(124, 255, 178, 0.2);
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 50px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* Quick Links Grid */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 48px;
}

.quick-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.quick-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.quick-link-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient-header);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.quick-link-content h3 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
}

.quick-link-content p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Page Header */
.page-header {
  background: var(--gradient-header);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  margin-bottom: 32px;
}

.page-header h1 {
  margin: 0 0 12px;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-header .meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-header .meta strong {
  color: var(--text-primary);
}

.page-header .meta a {
  color: var(--link-color);
  text-decoration: none;
}

.page-header .meta a:hover {
  text-decoration: underline;
}

.page-header .divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 18px 0;
}

.page-header .note {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Content Sections */
.content-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.content-section h2 {
  margin: 0 0 16px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.content-section p {
  color: var(--text-secondary);
  margin: 0 0 14px;
  font-size: 0.95rem;
}

.content-section p:last-child {
  margin-bottom: 0;
}

.content-section ul {
  margin: 14px 0;
  padding-left: 20px;
}

.content-section li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 10px;
  line-height: 1.6;
}

.content-section li:last-child {
  margin-bottom: 0;
}

.content-section li strong {
  color: var(--text-primary);
}

.content-section a {
  color: var(--link-color);
  text-decoration: none;
}

.content-section a:hover {
  text-decoration: underline;
}

.content-section code {
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 0.9em;
}

/* Contact Cards */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
}

.contact-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.contact-card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-header);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.contact-card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 600;
}

.contact-card p {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-card a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.contact-card a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

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

.footer-brand {
  max-width: 280px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.footer-logo-icon {
  width: 28px;
  height: 28px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.footer-logo-img {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.footer-section h4 {
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 16px;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 10px;
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

.footer-bottom a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--accent-primary);
}

/* CTA Buttons */
.cta-button {
  display: inline-block;
  background: var(--gradient-accent);
  color: var(--bg-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-glow);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(124, 255, 178, 0.2);
  text-decoration: none;
}

.cta-button.cta-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  box-shadow: none;
}

.cta-button.cta-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

/* Back to top link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-top: 32px;
  padding: 10px 0;
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--accent-primary);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: 32px; }
.mb-4 { margin-bottom: 32px; }

/* Smooth page transitions */
.page-content {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}