/* ==========================================================================
   mbseCLI Website Design System & Styling
   Clean, modern, accessible design for SysML v2 CLI & Visualizer
   ========================================================================== */

:root {
  --color-bg-canvas: #090d16;
  --color-bg-subtle: #0f172a;
  --color-bg-card: #151e32;
  --color-bg-card-hover: #1c2742;
  --color-bg-elevated: #1e293b;
  --color-bg-input: #0b1120;
  
  --color-border: #23314e;
  --color-border-subtle: #192338;
  --color-border-focus: #38bdf8;
  
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-bright: #ffffff;
  
  --color-primary: #0284c7;
  --color-primary-light: #38bdf8;
  --color-primary-dark: #0369a1;
  --color-primary-glow: rgba(56, 189, 248, 0.15);
  
  --color-success: #10b981;
  --color-success-subtle: rgba(16, 185, 129, 0.12);
  --color-warning: #f59e0b;
  --color-warning-subtle: rgba(245, 158, 11, 0.12);
  
  --color-syntax-keyword: #38bdf8;
  --color-syntax-entity: #34d399;
  --color-syntax-string: #fbbf24;
  --color-syntax-comment: #64748b;
  --color-syntax-attr: #93c5fd;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 24px var(--color-primary-glow);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  --container-max: 1200px;
}

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

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

body {
  background-color: var(--color-bg-canvas);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #7dd3fc;
}

code, pre, kbd {
  font-family: var(--font-mono);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: border-color var(--transition-fast);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-bright);
}

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

.nav-brand-text {
  letter-spacing: -0.03em;
}

.nav-brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-primary-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

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

.nav-link:hover {
  color: var(--color-text-bright);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  border-color: #0369a1;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #0284c7;
  border-color: #38bdf8;
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: #3b4d75;
  color: var(--color-text-bright);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
  padding: 0.65rem 0.85rem;
}

.btn-ghost:hover {
  color: var(--color-text-bright);
  background: var(--color-bg-elevated);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 5.5rem 0 3.5rem;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-primary-light);
  margin-bottom: 1.5rem;
}

.hero-tag svg {
  width: 14px;
  height: 14px;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--color-text-bright);
  max-width: 860px;
  margin: 0 auto 1.25rem;
}

.hero-title-highlight {
  color: var(--color-primary-light);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto 2.25rem;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-command-box {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  max-width: 520px;
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.command-prefix {
  color: var(--color-text-muted);
  user-select: none;
}

.command-text {
  color: #38bdf8;
  font-weight: 500;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border);
  color: var(--color-text-bright);
}

.copy-btn.copied {
  color: var(--color-success);
  border-color: rgba(16, 185, 129, 0.4);
  background: var(--color-success-subtle);
}

/* Interactive Showcase Mockup */
.showcase-wrapper {
  margin-top: 3.5rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  text-align: left;
}

.mockup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: #0b1220;
  border-bottom: 1px solid var(--color-border-subtle);
}

.mockup-dots {
  display: flex;
  gap: 6px;
}

.mockup-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.mockup-dot.red { background-color: #ef4444; }
.mockup-dot.yellow { background-color: #eab308; }
.mockup-dot.green { background-color: #22c55e; }

.mockup-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}

.mockup-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-success);
  background: var(--color-success-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
}

.mockup-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 6px var(--color-success);
}

.mockup-body {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  height: 480px;
  background: #090e18;
}

@media (max-width: 900px) {
  .mockup-body {
    grid-template-columns: 1fr;
    height: auto;
  }
}

.mockup-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--color-border-subtle);
  overflow: hidden;
}

.mockup-pane:last-child {
  border-right: none;
}

.mockup-pane-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.9rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: #0d1525;
  border-bottom: 1px solid var(--color-border-subtle);
}

.pane-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--color-primary-light);
}

/* Tree Pane */
.tree-content {
  padding: 0.75rem;
  overflow-y: auto;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.tree-node {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  user-select: none;
}

.tree-node:hover {
  background: var(--color-bg-card);
  color: var(--color-text-bright);
}

.tree-node.active {
  background: rgba(56, 189, 248, 0.12);
  color: var(--color-primary-light);
  font-weight: 600;
}

.tree-node.indent-1 { margin-left: 0.8rem; }
.tree-node.indent-2 { margin-left: 1.6rem; }
.tree-node.indent-3 { margin-left: 2.4rem; }

.tree-icon {
  width: 14px;
  height: 14px;
  color: var(--color-text-muted);
}

.tree-node.active .tree-icon {
  color: var(--color-primary-light);
}

/* Canvas/Diagram Pane */
.diagram-canvas {
  position: relative;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.04) 1px, transparent 1px);
  background-size: 20px 20px;
  overflow: hidden;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.diagram-controls {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 5;
}

.diagram-view-btn {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.diagram-view-btn.active {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-light);
  color: #ffffff;
}

.diagram-graph {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  position: relative;
  width: 100%;
  max-width: 440px;
}

.diagram-node {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  width: 100%;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  box-shadow: var(--shadow-sm);
}

.diagram-node:hover, .diagram-node.active {
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.2);
}

.diagram-node.active {
  background: #192742;
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border-subtle);
  padding-bottom: 0.4rem;
  margin-bottom: 0.4rem;
}

.node-kind {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-primary-light);
}

.node-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-bright);
}

.node-ports {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

.node-port {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.diagram-children {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
}

.diagram-connector {
  position: absolute;
  top: 68px;
  width: 2px;
  height: 32px;
  background: var(--color-border);
}

/* Inspector Pane */
.inspector-content {
  padding: 1rem;
  overflow-y: auto;
  font-size: 0.82rem;
}

.inspector-section {
  margin-bottom: 1.25rem;
}

.inspector-heading {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.property-row {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

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

.property-val {
  color: var(--color-text-primary);
  font-weight: 500;
}

.feedback-note-card {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  margin-top: 0.5rem;
}

.feedback-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  margin-bottom: 0.35rem;
}

.feedback-author {
  font-weight: 600;
  color: var(--color-text-bright);
}

.feedback-status {
  font-size: 0.68rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.feedback-text {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Sections */
.section {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border-subtle);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-light);
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-bright);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  background: var(--color-bg-card-hover);
  border-color: #3b4d75;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-light);
  margin-bottom: 1.25rem;
}

.feature-icon-wrapper svg {
  width: 22px;
  height: 22px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-bright);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Architecture & Workflow */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 860px) {
  .arch-grid {
    grid-template-columns: 1fr;
  }
}

.code-window {
  background: #0a0f1d;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.code-window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: #0e1628;
  border-bottom: 1px solid var(--color-border-subtle);
}

.code-filename {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}

.code-block {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
  color: #e2e8f0;
}

.syn-k { color: var(--color-syntax-keyword); font-weight: 600; }
.syn-e { color: var(--color-syntax-entity); font-weight: 600; }
.syn-s { color: var(--color-syntax-string); }
.syn-c { color: var(--color-syntax-comment); font-style: italic; }
.syn-a { color: var(--color-syntax-attr); }

/* Steps / Workflow */
.workflow-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.workflow-item {
  display: flex;
  gap: 1.25rem;
}

.workflow-step {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-primary);
  color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.workflow-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.workflow-content p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
}

/* Installation Tabs */
.install-tabs-wrapper {
  max-width: 780px;
  margin: 0 auto;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.tab-nav {
  display: flex;
  background: #0c1322;
  border-bottom: 1px solid var(--color-border-subtle);
}

.tab-btn {
  padding: 0.85rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-text-bright);
}

.tab-btn.active {
  color: var(--color-primary-light);
  border-bottom-color: var(--color-primary-light);
  background: var(--color-bg-subtle);
}

.tab-pane {
  display: none;
  padding: 1.5rem;
}

.tab-pane.active {
  display: block;
}

.tab-code-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #080d1a;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* CLI Reference Table */
.cli-table-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.cli-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.cli-table th, .cli-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.cli-table th {
  background: #0d1525;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cli-table tr:last-child td {
  border-bottom: none;
}

.cli-flag {
  font-family: var(--font-mono);
  color: var(--color-primary-light);
  font-weight: 600;
  white-space: nowrap;
}

.cli-default {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--color-border-subtle);
  background: #060910;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-bright);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-text-bright);
}

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

@media (max-width: 640px) {
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
}