/* ==========================================================================
   Workpiece Landing Page Styles
   ========================================================================== */

/* CSS Variables */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-background: #ffffff;
  --color-background-alt: #f9fafb;
  --color-border: #e5e7eb;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --container-max: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
}

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

.btn-secondary:hover {
  background: var(--color-background-alt);
  color: var(--color-text);
}

.btn-large {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.logo:hover {
  color: var(--color-text);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--color-text-light);
  font-weight: 500;
}

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

.nav-links .btn-primary,
.nav-links .btn-primary:hover {
  color: white;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero {
  padding: calc(64px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  text-align: center;
  background: linear-gradient(180deg, var(--color-background-alt) 0%, var(--color-background) 100%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* AI Collaboration Section */
.collaboration {
  padding: var(--spacing-2xl) 0;
  background: var(--color-background-alt);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.collaboration h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.collab-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.collab-card {
  background: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.collab-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
}

.collab-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.collab-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.collab-card p {
  color: var(--color-text-light);
  line-height: 1.7;
}

@media (max-width: 900px) {
  .collab-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

/* Features Section */
.features {
  padding: var(--spacing-2xl) 0;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  padding: var(--spacing-lg);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-background-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.feature-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* How It Works Section */
.how-it-works {
  padding: var(--spacing-2xl) 0;
  background: var(--color-background-alt);
}

.how-it-works h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 auto var(--spacing-md);
}

.step h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.step p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

@media (max-width: 768px) {
  .steps {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .step {
    padding-bottom: var(--spacing-lg);
  }

  .step:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: var(--spacing-md);
    background: var(--color-border);
  }
}

/* About Section */
.about {
  padding: var(--spacing-2xl) 0;
  background: var(--color-background);
  text-align: center;
}

.about h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.about p {
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  font-size: 1.125rem;
}

/* Footer */
.footer {
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  background: var(--color-text);
  color: white;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand .logo {
  color: white;
  margin-bottom: var(--spacing-sm);
}

.footer-brand .logo-icon {
  color: white;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.footer-column h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-column a {
  display: block;
  color: rgba(255, 255, 255, 0.8);
  padding: 0.25rem 0;
  font-size: 0.9375rem;
}

.footer-column a:hover {
  color: white;
}

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

/* Legal Pages */
.legal-page {
  padding: calc(64px + var(--spacing-xl)) 0 var(--spacing-2xl);
}

.legal-page h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
}

.legal-page .last-updated {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
}

.legal-content {
  max-width: 800px;
}

.legal-content h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.legal-content h3 {
  font-size: 1.125rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-xs);
}

.legal-content p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

.legal-content ul {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  color: var(--color-text-light);
}

.legal-content li {
  margin-bottom: var(--spacing-xs);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-sm);
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links .btn {
    width: 100%;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    padding: calc(64px + var(--spacing-xl)) 0 var(--spacing-xl);
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }
}

@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
  }

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

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
  }
}