/* ==========================================================================
   Kaiser & Preusse - Simple, Professional Stylesheet
   ========================================================================== */

/* CSS Variables */
:root {
  --color-primary: #0891b2;
  --color-primary-dark: #0e7490;
  --color-accent: #f97316;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-background: #ffffff;
  --color-background-alt: #f8fafc;
  --color-border: #e2e8f0;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1200px;
  --max-width-narrow: 800px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-background);
}

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

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

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

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

.content-narrow {
  max-width: var(--max-width-narrow);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

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

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2rem;
}

.nav-menu a {
  color: var(--color-text);
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.2s;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-background);
    padding: 1rem 1.5rem;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    display: none;
  }

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

  .nav-menu li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-menu a {
    display: block;
    padding: 1rem 0;
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: 6px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-full {
  width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: 6rem 0 4rem;
  margin-top: 70px;
  background-color: #f8fafc;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

.hero-content {
  max-width: 600px;
  background: rgba(255, 255, 255, 0.9);
  padding: 2rem;
  border-radius: 8px;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--color-text);
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-light);
  margin: 0 0 1.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero {
    padding: 4rem 0 3rem;
  }

  .hero-content {
    text-align: center;
  }

  .hero-buttons {
    justify-content: center;
  }
}

/* ==========================================================================
   Solutions Overview
   ========================================================================== */

.solutions-overview {
  padding: 5rem 0;
  background: var(--color-background);
}

.solutions-overview h2 {
  text-align: center;
  font-size: 2rem;
  margin: 0 0 3rem;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.solution-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.solution-card:hover {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.solution-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #f0fdfa, #ecfeff);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.solution-icon.large {
  width: 72px;
  height: 72px;
  margin-bottom: 2rem;
}

.solution-card h3 {
  font-size: 1.25rem;
  margin: 0 0 1rem;
}

.solution-card p {
  color: var(--color-text-light);
  margin: 0 0 1.5rem;
}

.solution-link {
  font-weight: 600;
  color: var(--color-primary);
}

.solution-link:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================================
   Contact CTA Section
   ========================================================================== */

.contact-cta {
  padding: 5rem 0;
  background: linear-gradient(135deg, #f0fdfa 0%, #ecfeff 100%);
  text-align: center;
}

.contact-cta h2 {
  font-size: 2rem;
  margin: 0 0 1rem;
}

.contact-cta p {
  color: var(--color-text-light);
  margin: 0 0 2rem;
  font-size: 1.125rem;
}

/* ==========================================================================
   Page Header
   ========================================================================== */

.page-header {
  padding: 8rem 0 4rem;
  background: linear-gradient(135deg, #f0fdfa 0%, #ffffff 100%);
}

.page-header h1 {
  font-size: 2.5rem;
  margin: 0 0 0.5rem;
}

.page-description {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin: 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--color-text-light);
  font-weight: 500;
}

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

/* ==========================================================================
   Page Content
   ========================================================================== */

.page-content {
  padding: 4rem 0;
}

.page-content h2 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content h3 {
  font-size: 1.125rem;
  margin: 1.5rem 0 0.5rem;
}

.page-content p {
  margin: 0 0 1rem;
}

/* ==========================================================================
   Solution Detail Page
   ========================================================================== */

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

.solution-header .container {
  max-width: var(--max-width-narrow);
}

.solution-detail {
  padding: 4rem 0;
}

.solution-intro {
  max-width: var(--max-width-narrow);
  margin: 0 auto 4rem;
  text-align: center;
}

.solution-intro .lead {
  font-size: 1.25rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.solution-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
  margin-bottom: 4rem;
}

.solution-section h2 {
  font-size: 1.25rem;
  margin: 0 0 1.5rem;
  color: var(--color-primary);
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.check-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-light);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.solution-cta {
  text-align: center;
  padding: 3rem;
  background: var(--color-background-alt);
  border-radius: 12px;
}

.solution-cta h2 {
  margin: 0 0 0.5rem;
}

.solution-cta p {
  color: var(--color-text-light);
  margin: 0 0 1.5rem;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-section {
  padding: 4rem 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-message {
  padding: 1.5rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.form-message.success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.form-message.error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.contact-info h3 {
  margin: 0 0 2rem;
}

.contact-item {
  margin-bottom: 1.5rem;
}

.contact-item strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--color-text-light);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-item a,
.contact-item p {
  color: var(--color-text);
  margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-text);
  color: #94a3b8;
  padding: 4rem 0 2rem;
}

.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-brand h3 {
  color: white;
  margin: 0 0 1rem;
}

.footer-brand p {
  margin: 0 0 1.5rem;
  line-height: 1.7;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: white;
  transition: background 0.2s;
}

.social-link:hover {
  background: var(--color-primary);
  color: white;
}

.footer-links h4 {
  color: white;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 1rem;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #94a3b8;
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 0.875rem;
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.hidden {
  display: none !important;
}