/* 
  MQTT Demo - Design Tokens
  Modern Glassmorphism Theme with shadcn/ui tokens
*/

:root {
  /* ====== SHADCN/UI COLORS ====== */
  --color-primary: #2563eb;
  --color-primary-foreground: #ffffff;
  --color-primary-hover: #1d4ed8;
  
  --color-secondary: #64748b;
  --color-secondary-foreground: #ffffff;
  
  --color-success: #10b981;
  --color-success-foreground: #ffffff;
  
  --color-warning: #f59e0b;
  --color-warning-foreground: #ffffff;
  
  --color-destructive: #ef4444;
  --color-destructive-foreground: #ffffff;
  
  --color-muted: #64748b;
  --color-muted-foreground: #94a3b8;
  
  --color-accent: #1e293b;
  --color-accent-foreground: #f8fafc;
  
  --color-border: #334155;
  --color-input: #334155;
  --color-ring: #2563eb;

  /* ====== MQTT STATUS COLORS ====== */
  --mqtt-connected: #10b981;
  --mqtt-disconnected: #ef4444;
  --mqtt-connecting: #f59e0b;
  --mqtt-error: #ef4444;

  /* ====== BACKGROUND COLORS ====== */
  --background: #0f172a;
  --foreground: #f8fafc;
  
  --card: rgba(30, 41, 59, 0.8);
  --card-foreground: #f8fafc;
  
  --glass-bg: rgba(30, 41, 59, 0.6);
  --glass-border: rgba(148, 163, 184, 0.15);
  --glass-blur: 16px;

  /* ====== GRADIENTS ====== */
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.03) 100%);

  /* ====== TYPOGRAPHY ====== */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* ====== SPACING ====== */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;

  /* ====== BORDER RADIUS ====== */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* ====== TRANSITIONS ====== */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--foreground);
  background: var(--background);
  min-height: 100vh;
}

/* ====== GLASSMORPHISM COMPONENTS ====== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
}

.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
}

/* ====== NAVIGATION ====== */
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--foreground);
  text-decoration: none;
}

.logo-icon {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: var(--spacing-6);
}

.nav-links a {
  color: var(--color-muted-foreground);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--foreground);
}

/* ====== SECTION STYLES ====== */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-8) var(--spacing-6);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--foreground);
  margin-bottom: var(--spacing-2);
  text-align: center;
}

.section-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-muted-foreground);
  text-align: center;
  margin-bottom: var(--spacing-8);
}

/* ====== HERO SECTION ====== */
.hero {
  padding: calc(80px + var(--spacing-12)) var(--spacing-6) var(--spacing-12);
  text-align: center;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-4);
}

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

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

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-muted-foreground);
  max-width: 600px;
  margin: 0 auto var(--spacing-8);
}

/* ====== CONNECTION PANEL ====== */
.connection-panel {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-6);
}

.connection-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--glass-border);
}

.connection-header h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.connection-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-muted-foreground);
}

.form-group input {
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  color: var(--foreground);
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-group input:focus {
  border-color: var(--color-primary);
}

.form-group input::placeholder {
  color: var(--color-muted-foreground);
}

/* ====== STATUS BADGES ====== */
.status {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-connected {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-disconnected {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-connecting {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.status-soon {
  background: rgba(100, 116, 139, 0.2);
  color: #94a3b8;
  border: 1px solid rgba(100, 116, 139, 0.3);
}

/* ====== BUTTONS ====== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-primary-foreground);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--foreground);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-primary);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-xs);
}

.btn-icon {
  font-size: 1rem;
}

/* ====== STATS ROW ====== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
}

.stat-card {
  padding: var(--spacing-4);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
}

.stat-icon {
  font-size: 1.5rem;
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ====== MESSAGES PANEL ====== */
.messages-panel {
  min-height: 400px;
  display: flex;
  flex-direction: column;
}

.messages-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--glass-border);
}

.messages-header h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.messages-actions {
  display: flex;
  gap: var(--spacing-2);
}

.messages-container {
  flex: 1;
  padding: var(--spacing-4);
  overflow-y: auto;
  max-height: 400px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-12);
  color: var(--color-muted-foreground);
  text-align: center;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-4);
  opacity: 0.5;
}

/* ====== MESSAGE ITEMS ====== */
.message-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  padding: var(--spacing-4);
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-3);
  border-left: 3px solid var(--color-primary);
}

.message-topic {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.message-content {
  font-size: var(--font-size-sm);
  color: var(--foreground);
  font-family: var(--font-mono);
  white-space: pre-wrap;
  word-break: break-word;
}

.message-time {
  font-size: var(--font-size-xs);
  color: var(--color-muted-foreground);
}

/* ====== DOCS GRID ====== */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-6);
}

.doc-card {
  padding: var(--spacing-6);
}

.doc-card h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-3);
  color: var(--foreground);
}

.doc-card p {
  font-size: var(--font-size-sm);
  color: var(--color-muted-foreground);
  margin-bottom: var(--spacing-4);
  line-height: 1.6;
}

.doc-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.doc-card li {
  font-size: var(--font-size-sm);
  color: var(--color-muted-foreground);
  padding-left: var(--spacing-4);
  position: relative;
}

.doc-card li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.doc-card code {
  background: rgba(37, 99, 235, 0.2);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: #60a5fa;
}

/* ====== TOPICS LIST ====== */
.topics-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.topic-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
}

.topic-icon {
  font-size: 1.25rem;
}

.topic-name {
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--foreground);
}

.topic-qos {
  padding: var(--spacing-1) var(--spacing-2);
  background: rgba(37, 99, 235, 0.2);
  color: #60a5fa;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ====== FOOTER ====== */
.footer {
  padding: var(--spacing-8) 0;
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--glass-border);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-6);
  text-align: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--foreground);
  margin-bottom: var(--spacing-2);
}

.footer-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-muted-foreground);
  margin-bottom: var(--spacing-4);
}

.footer-copy {
  font-size: var(--font-size-xs);
  color: var(--color-muted-foreground);
}

/* ====== RESPONSIVE ====== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .messages-actions {
    flex-wrap: wrap;
  }
}