/* RealCap Design System - Dark Professional Theme */

/* === CSS Variables === */
:root {
  /* Colors */
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f172a;
  --accent-primary: #4ade80;
  --accent-secondary: #22c55e;
  --accent-gradient: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --border-color: #334155;

  /* RGB values for opacity variations */
  --bg-primary-rgb: 26, 26, 46;
  --accent-primary-rgb: 74, 222, 128;

  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  /* Spacing */
  --header-height: 64px;
  --hero-padding: 80px;
  --section-gap: 60px;
  --card-padding: 24px;
  --card-gap: 24px;

  /* Breakpoints (for reference, use in media queries) */
  --bp-desktop: 1024px;
  --bp-tablet: 768px;
  --bp-mobile: 480px;
}

/* === Base Styles === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--text-secondary);
  font-size: 1rem;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-secondary);
}

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(var(--bg-primary-rgb), 0.95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}

.header-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.header-nav {
  display: flex;
  gap: 32px;
}

.header-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.header-nav a:hover {
  color: var(--text-primary);
}

.header-nav a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.header-lang-switch {
  display: flex;
  gap: 8px;
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 4px;
}

.header-lang-btn {
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.header-lang-btn.active {
  background: var(--accent-gradient);
  color: var(--bg-primary);
}

.header-lang-btn:hover:not(.active) {
  color: var(--text-primary);
}

.header-lang-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Mobile Header */
.header-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 24px;
}

@media (max-width: 768px) {
  .header {
    padding: 0 16px;
  }

  .header-nav {
    display: none;
  }

  .header-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--hero-padding) 40px;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--accent-primary);
  margin-bottom: 32px;
  font-weight: 500;
}

.hero-cta {
  display: inline-flex;
  padding: 16px 32px;
  background: var(--accent-gradient);
  color: var(--bg-primary);
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-cta:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 40px rgba(var(--accent-primary-rgb), 0.3);
}

.hero-cta:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 4px;
}

@media (max-width: 768px) {
  .hero {
    padding: 60px 16px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-cta {
    padding: 12px 24px;
    font-size: 1rem;
  }
}

/* === Features Section === */
.features {
  padding: var(--section-gap) 40px;
  background: var(--bg-secondary);
}

.features-title {
  text-align: center;
  margin-bottom: 48px;
  font-size: 2rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--card-gap);
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--card-padding);
  text-align: center;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.feature-card:focus-within {
  border-color: var(--accent-primary);
}

.feature-card:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--accent-gradient);
  border-radius: 12px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .features {
    padding: 40px 16px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* === Blog Preview Section === */
.blog-preview {
  padding: var(--section-gap) 40px;
  background: var(--bg-primary);
}

.blog-preview-title {
  text-align: center;
  margin-bottom: 48px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--card-gap);
  max-width: 1200px;
  margin: 0 auto;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--card-padding);
  transition: border-color 0.2s ease;
}

.blog-card:hover {
  border-color: var(--accent-primary);
}

.blog-card:focus-within {
  border-color: var(--accent-primary);
}

.blog-card:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.blog-card-title {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.blog-card-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.blog-card-link {
  font-size: 0.85rem;
  color: var(--accent-primary);
}

@media (max-width: 768px) {
  .blog-preview {
    padding: 40px 16px;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }
}

/* === Footer === */
.footer {
  padding: 40px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 20px;
  transition: color 0.2s ease, background 0.2s ease;
}

.footer-social a:hover {
  color: var(--accent-primary);
  background: var(--bg-primary);
}

.footer-social a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-license {
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-top: 8px;
}

@media (max-width: 768px) {
  .footer {
    padding: 24px 16px;
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}

/* === Utility Classes === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}