/* ==========================================================================
   AcuSignal.ai — Modern Web CSS Design System
   Sleek Dark Mode, Glassmorphism, Neon Gradients, Responsive Typography
   ========================================================================== */

:root {
  --bg-dark: #090d16;
  --bg-card: rgba(18, 26, 43, 0.65);
  --bg-card-hover: rgba(28, 40, 65, 0.8);
  --bg-alt: #0d1322;
  
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(99, 102, 241, 0.4);
  
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.35);
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  position: relative;
  overflow-x: hidden;
}

/* Ambient Glow Blobs */
.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.4;
}

.glow-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  top: -100px;
  left: -100px;
}

.glow-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
  top: 400px;
  right: -200px;
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 100px 0;
}

.bg-alt {
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

/* Typography Utilities */
.text-gradient {
  background: linear-gradient(135deg, #60a5fa 0%, #a855f7 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glassmorphism Panel Component */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: var(--transition);
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

.highlight-panel {
  border-color: var(--border-highlight);
  box-shadow: 0 0 30px var(--primary-glow);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  background: rgba(9, 13, 22, 0.85);
  border-bottom: 1px solid var(--border-glass);
  padding: 16px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.logo-symbol {
  font-size: 1.4rem;
}

.logo-dot {
  color: var(--accent-cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
  color: #fff;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px var(--primary-glow);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

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

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-full {
  width: 100%;
}

/* Hero Section */
.hero-section {
  padding: 180px 0 100px;
  text-align: center;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 0.85rem;
  color: #a5b4fc;
  margin-bottom: 24px;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 900px;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 60px;
}

/* Hero Metrics */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  width: 100%;
  margin-top: 20px;
}

.metric-card {
  padding: 24px;
  text-align: center;
}

.metric-value {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 4px;
}

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

/* Section Header */
.section-header {
  margin-bottom: 60px;
}

.section-header.center {
  text-align: center;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-icon {
  font-size: 2.5rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Terminal Window Component */
.terminal-window {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: #080c14;
}

.terminal-header {
  background: #111726;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-glass);
}

.terminal-buttons {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background-color: #ff5f56; }
.dot.yellow { background-color: #ffbd2e; }
.dot.green { background-color: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-terminal-run {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--accent-green);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-terminal-run:hover {
  background: var(--accent-green);
  color: #000;
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
}

.term-line {
  margin-bottom: 8px;
}

.term-prompt {
  color: var(--accent-cyan);
}

.term-success {
  color: var(--accent-green);
}

.term-info {
  color: #a5b4fc;
}

.term-dim {
  color: var(--text-dim);
}

.term-code-block {
  background: rgba(0, 0, 0, 0.5);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin: 12px 0;
  overflow-x: auto;
}

.term-code-block pre {
  color: #e5e7eb;
}

.term-code-block .key { color: #93c5fd; }
.term-code-block .string { color: #34d399; }

/* Architecture Flow */
.architecture-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.arch-step {
  padding: 28px;
  flex: 1;
  text-align: center;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.arch-step h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

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

.arch-arrow {
  font-size: 1.5rem;
  color: var(--text-dim);
}

/* Integration Layout & Tabs */
.integration-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

.tab-sidebar {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}

.tab-content-container {
  padding: 36px;
}

.tab-content {
  display: none;
}

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

.tab-content h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.tab-content p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.code-box {
  background: #060911;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  overflow-x: auto;
  color: #a5b4fc;
}

/* Manifesto Section */
.manifesto-box {
  padding: 60px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.manifesto-quote {
  font-size: 1.4rem;
  font-style: italic;
  color: #e0e7ff;
  max-width: 850px;
  line-height: 1.6;
}

.manifesto-footer {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Contact Form */
.contact-card {
  max-width: 650px;
  margin: 0 auto;
  padding: 48px;
}

.contact-form {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.glass-input {
  width: 100%;
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition);
}

.glass-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 16px var(--primary-glow);
}

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-glass);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 8px;
}

.footer-right span {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-title { font-size: 2.8rem; }
  .hero-metrics { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .architecture-flow { flex-direction: column; }
  .arch-arrow { transform: rotate(90deg); margin: 8px 0; }
  .integration-layout { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .hero-title { font-size: 2.2rem; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn-large { width: 100%; }
  .form-row { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}