/* ==========================================================================
   RRTS Web - Design System & Modern Theme Engine
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* --- Root Design Tokens & Default Cyber Dark Theme --- */
:root {
  /* Default: Cyber Obsidian Theme */
  --bg-primary: #0b0f17;
  --bg-surface: #111827;
  --bg-card: #161f30;
  --bg-card-hover: #1e293b;
  --bg-input: #111827;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --accent-primary: #3b82f6;
  --accent-secondary: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --accent-glow: rgba(59, 130, 246, 0.25);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(59, 130, 246, 0.4);
  --glass-bg: rgba(22, 31, 48, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-code: 'JetBrains Mono', monospace;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Theme 2: Enterprise Cobalt --- */
[data-theme="enterprise"] {
  --bg-primary: #0f172a;
  --bg-surface: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-input: #0f172a;
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-subtle: #94a3b8;
  --accent-primary: #6366f1;
  --accent-secondary: #10b981;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #10b981 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --border-color: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(99, 102, 241, 0.5);
  --glass-bg: rgba(30, 41, 59, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.3);
}

/* --- Theme 3: Modern Emerald Light --- */
[data-theme="emerald"] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --accent-primary: #059669;
  --accent-secondary: #0284c7;
  --accent-gradient: linear-gradient(135deg, #059669 0%, #0284c7 100%);
  --accent-glow: rgba(5, 150, 105, 0.2);
  --border-color: #e2e8f0;
  --border-hover: rgba(5, 150, 105, 0.4);
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 4px 20px rgba(5, 150, 105, 0.15);
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* --- Layout Utility Classes --- */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 650px;
  margin-bottom: 3rem;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  color: var(--accent-primary);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* --- Navigation Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
}

.logo-img {
  height: 40px;
  width: auto;
  max-height: 40px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Switcher Widget */
.theme-switcher {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.5rem;
  gap: 0.25rem;
}

.theme-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-btn:hover {
  color: var(--text-main);
}

.theme-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- Hero Section --- */
.hero {
  padding: 10rem 0 6rem 0;
  position: relative;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100%;
  background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
  pointer-events: none;
  z-index: -1;
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: var(--accent-glow);
  filter: blur(140px);
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 1.25rem 0 1.5rem 0;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* --- Metrics Bar --- */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 4rem;
}

.metric-card {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: var(--radius-md);
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform var(--transition-normal);
}

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

.metric-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Practice Cards Grid --- */
.practices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.practice-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.practice-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.practice-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--accent-glow);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.practice-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.practice-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.practice-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* --- Blueprint Lifecycle Steps --- */
.blueprint-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  position: relative;
}

.step-card {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  position: relative;
}

.step-number {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: var(--font-code);
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

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

/* --- Blog Cards & Filters --- */
.blog-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .blog-controls {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.blog-search {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.blog-search input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.blog-search input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.blog-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
}

.blog-categories {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cat-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cat-btn:hover, .cat-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.blog-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.blog-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-subtle);
  margin-bottom: 0.75rem;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  transition: color var(--transition-fast);
}

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

.blog-card-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex: 1;
}

.blog-card-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.75rem;
}

/* --- Article Detail View --- */
.article-container {
  max-width: 820px;
  margin: 0 auto;
  padding-top: 8rem;
  padding-bottom: 6rem;
}

.article-header {
  margin-bottom: 3rem;
  text-align: center;
}

.article-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 1rem 0;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-main);
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem 0;
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 2rem 0 0.85rem 0;
}

.article-content p {
  margin-bottom: 1.5rem;

}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-primary);
  padding: 1rem 1.5rem;
  background: var(--glass-bg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-muted);
}

.article-content pre {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.9rem;
  margin: 2rem 0;
}

/* --- Contact & Forms --- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;

}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* --- Footer --- */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem 0;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-subtle);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --- Responsive Media Queries --- */
@media (max-width: 991px) {
  .hero-title {
    font-size: 2.75rem;
  }
  .article-title {
    font-size: 2.25rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    flex-direction: column;
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.25rem;
  }
}