/* ==========================================================================
   Chana Software - Main Stylesheet
   Design System: Clean, minimal, enterprise-focused
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-primary: #000000;
  --color-accent: #047857;
  --color-accent-hover: #065f46;
  --color-background: #ffffff;
  --color-background-alt: #f3f4f6;
  --color-text: #1f2937;
  --color-text-light: #4b5563;
  --color-text-lighter: #6b7280;
  --color-border: #e5e7eb;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 18px;
  --font-size-sm: 16px;
  --font-size-xs: 14px;
  --font-size-h1: 56px;
  --font-size-h2: 40px;
  --font-size-h3: 28px;
  --font-size-h4: 22px;
  --line-height-base: 1.7;
  --line-height-heading: 1.2;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 48px;
  --spacing-xl: 80px;
  --spacing-2xl: 120px;
  
  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-accent-hover);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-heading);
  color: var(--color-primary);
}

h1 {
  font-size: var(--font-size-h1);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-h2);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-h3);
}

h4 {
  font-size: var(--font-size-h4);
}

p {
  margin-bottom: var(--spacing-md);
}

p:last-child {
  margin-bottom: 0;
}

.text-light {
  color: var(--color-text-light);
}

.text-lighter {
  color: var(--color-text-lighter);
}

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section {
  padding: var(--spacing-xl) 0;
}

.section-alt {
  background-color: var(--color-background-alt);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
  max-width: var(--max-width);
  z-index: 1000;
  background-color: var(--color-background);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.header.scrolled {
  top: 0;
  left: 0;
  transform: none;
  width: 100%;
  max-width: 100%;
  border-radius: 0;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 var(--spacing-md);
}

.header.scrolled .header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo img {
  height: 36px;
  width: auto;
  max-width: 200px;
}

.logo:hover {
  opacity: 0.8;
}

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

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 6px 0;
  transition: var(--transition-base);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: white;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: calc(88px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero-compact {
  min-height: auto;
  padding: calc(88px + var(--spacing-xl)) 0 var(--spacing-lg);
}

.hero-compact + .section {
  padding-top: 0;
}

.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-content {
  max-width: 720px;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.hero-image img {
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* --------------------------------------------------------------------------
   Services Grid
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.service-card {
  padding: var(--spacing-lg);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition-fast);
}

.service-card:hover {
  border-color: var(--color-accent);
}

.service-card h3 {
  margin-bottom: var(--spacing-sm);
}

.service-card p {
  color: var(--color-text-light);
}

/* Service detail page cards */
.service-detail {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.service-detail:last-child {
  border-bottom: none;
}

.service-problem {
  font-size: 20px;
  font-style: italic;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.service-fit {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--color-background-alt);
  border-radius: 6px;
}

.service-fit strong {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Trust Bar
   -------------------------------------------------------------------------- */
.trust-bar {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.trust-bar p {
  text-align: center;
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

.logo-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.logo-grid img {
  height: 40px;
  width: auto;
  opacity: 0.7;
  filter: grayscale(100%);
  transition: all var(--transition-fast);
}

.logo-grid img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* --------------------------------------------------------------------------
   Differentiator / Feature Section
   -------------------------------------------------------------------------- */
.differentiator {
  text-align: center;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.differentiator h2 {
  margin-bottom: var(--spacing-sm);
}

.differentiator p {
  font-size: 20px;
  color: var(--color-text-light);
}

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

.feature {
  text-align: center;
}

.feature h3 {
  margin-bottom: var(--spacing-sm);
}

.feature p {
  color: var(--color-text-light);
}

/* Founder Section (Homepage) */
.founder-section {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.founder-image img {
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.founder-content h2 {
  margin-bottom: var(--spacing-sm);
}

.founder-intro {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.founder-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.founder-feature {
  padding: var(--spacing-md);
  background-color: var(--color-background);
  border-radius: 8px;
}

.founder-feature h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xs);
}

.founder-feature p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Project / Work Cards
   -------------------------------------------------------------------------- */
.project-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.project-featured img {
  max-height: 520px;
  width: auto;
  margin: 0 auto;
}

.project-featured-content h2 {
  margin-bottom: var(--spacing-xs);
}

.project-meta {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

.project-section {
  margin-bottom: var(--spacing-md);
}

.project-section h4 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.project-card:hover {
  border-color: var(--color-accent);
}

.project-card-image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-background-alt);
}

.project-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-card-content {
  padding: var(--spacing-md);
}

.project-card h3 {
  margin-bottom: var(--spacing-xs);
}

.project-card p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-intro {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.about-photo img {
  border-radius: 8px;
}

.about-content h1 {
  margin-bottom: var(--spacing-md);
}

.about-lead {
  font-size: 20px;
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Contact Form
   -------------------------------------------------------------------------- */
/* --------------------------------------------------------------------------
   Contact Page
   -------------------------------------------------------------------------- */
.contact-hero {
  padding: calc(72px + var(--spacing-xl)) 0 var(--spacing-xl);
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--color-background-alt);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background-color: var(--color-background);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.contact-photo {
  position: relative;
}

.contact-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 600px;
}

.contact-form-wrapper {
  padding: var(--spacing-xl);
}

.contact-form-wrapper h1 {
  font-size: var(--font-size-h2);
  margin-bottom: var(--spacing-sm);
}

.contact-intro {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.contact-form {
  margin-bottom: var(--spacing-lg);
}

.contact-details {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.contact-location {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin: 0;
}

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

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.contact-info h3 {
  margin-bottom: var(--spacing-md);
}

.contact-info p {
  color: var(--color-text-light);
}

.contact-expect {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-background-alt);
  border-radius: 6px;
}

.contact-expect h4 {
  margin-bottom: var(--spacing-sm);
}

.contact-expect ol {
  padding-left: var(--spacing-md);
  color: var(--color-text-light);
}

.contact-expect li {
  margin-bottom: var(--spacing-xs);
}

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

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

.footer p {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
}

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

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  font-size: 20px;
  color: var(--color-text-light);
  max-width: 600px;
}

.section-header.text-center p {
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   Testimonials Section
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.testimonial-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-lg);
}

.testimonial-stars {
  color: #f59e0b;
  font-size: 20px;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-md);
}

.testimonial-stars .half-star {
  display: inline-block;
  position: relative;
  color: #d1d5db;
}

.testimonial-stars .half-star::before {
  content: "★";
  position: absolute;
  left: 0;
  overflow: hidden;
  width: 50%;
  color: #f59e0b;
}

.testimonial-quote {
  margin-bottom: var(--spacing-md);
}

.testimonial-thai {
  font-size: var(--font-size-base);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-style: italic;
}

.testimonial-english {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.testimonial-info strong {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.testimonial-info span {
  font-size: var(--font-size-xs);
  color: var(--color-text-lighter);
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */
.cta-section {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.cta-section h2 {
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  font-size: 20px;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   Legal Pages (Terms & Privacy)
   -------------------------------------------------------------------------- */
.legal-content {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.legal-content h1 {
  margin-bottom: var(--spacing-sm);
}

.legal-updated {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.legal-content h2 {
  font-size: var(--font-size-h4);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

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

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

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

.legal-content a {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --font-size-h1: 44px;
    --font-size-h2: 34px;
    --font-size-h3: 24px;
  }
  
  .hero-split {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .hero-image {
    order: -1;
    max-width: 400px;
  }
  
  .founder-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .founder-image {
    max-width: 350px;
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-grid,
  .projects-grid {
    gap: var(--spacing-md);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .project-featured {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .about-intro {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .about-photo {
    order: -1;
    max-width: 300px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-layout {
    grid-template-columns: 1fr;
  }
  
  .contact-photo {
    max-height: 400px;
  }
  
  .contact-photo img {
    min-height: 300px;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-h1: 36px;
    --font-size-h2: 28px;
    --font-size-h3: 22px;
    --font-size-base: 16px;
    --spacing-xl: 60px;
    --spacing-2xl: 80px;
  }
  
  .header {
    top: 12px;
    width: calc(100% - 24px);
  }
  
  .header-inner {
    height: 64px;
  }
  
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    border-radius: 0 0 12px 12px;
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-sm);
  }
  
  .nav.active {
    display: flex;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    padding: calc(64px + var(--spacing-xl)) 0 var(--spacing-xl);
    min-height: auto;
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .hero-image {
    max-width: 100%;
  }
  
  .services-grid,
  .projects-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-hero {
    padding: calc(64px + var(--spacing-md)) 0 var(--spacing-md);
    min-height: auto;
  }
  
  .contact-layout {
    border-radius: 8px;
  }
  
  .contact-form-wrapper {
    padding: var(--spacing-lg);
  }
  
  .footer-inner {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-h1: 32px;
    --font-size-h2: 26px;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
  
  .logo-grid {
    gap: var(--spacing-md);
  }
  
  .logo-grid img {
    height: 32px;
  }
}