/**
 * OAO Studio - Main Stylesheet
 * Converted from Next.js Tailwind CSS to Pure CSS
 * Zero dependencies, optimized for AI comprehension
 */

/* ===== CSS Variables (Design Tokens) ===== */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;

  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-dark: #1e293b;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Layout */
  --container-max-width: 1280px;
  --header-height: 64px;

  /* Effects */
  --shadow-sm: 0 1px 2px 0 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-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

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

body.menu-open {
  overflow: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

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

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

main {
  min-height: calc(100vh - var(--header-height));
}

/* ===== Header Styles ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Brand/Logo */
.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text-zh {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.brand-text-en {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

/* Desktop Navigation */
.nav-menu {
  display: none;
  gap: var(--spacing-xl);
}

.nav-link {
  position: relative;
  padding: var(--spacing-sm) 0;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
  margin: 3px 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translateY(8px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translateY(-8px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  right: 0;
  width: 280px;
  bottom: 0;
  background-color: var(--color-bg-primary);
  overflow-y: auto;
  z-index: 100;
  box-shadow: -4px 0 20px rgba(15, 23, 42, 0.15);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  visibility: hidden;
}

.mobile-menu.active {
  transform: translateX(0);
  visibility: visible;
}

.mobile-menu-content {
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-lg) var(--spacing-md);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
  border-radius: 8px;
  margin-bottom: var(--spacing-sm);
  transition: all var(--transition-fast);
  text-align: right;
}

.mobile-nav-link:last-child {
  margin-bottom: 0;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.08);
}

/* ===== Footer Styles ===== */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-bg-primary);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.footer-brand-zh {
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-brand-en {
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0.8;
}

.footer-tagline,
.footer-founded {
  font-size: 0.875rem;
  opacity: 0.7;
}

.footer-heading {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: var(--color-bg-primary);
  opacity: 0.8;
  font-size: 0.875rem;
  transition: opacity var(--transition-fast);
}

.footer-link:hover {
  opacity: 1;
  color: var(--color-bg-primary);
}

.footer-contact {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.contact-item {
  font-size: 0.875rem;
  line-height: 1.5;
}

.contact-label {
  font-weight: 600;
  margin-right: var(--spacing-xs);
}

.contact-link {
  color: var(--color-bg-primary);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.contact-link:hover {
  opacity: 1;
  color: var(--color-bg-primary);
}

.contact-text {
  opacity: 0.8;
}

/* Social Media */
.footer-social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  color: #00B900; /* LINE brand green */
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.social-link:hover {
  background-color: #00B900;
  color: var(--color-bg-primary);
}

.social-icon {
  width: 20px;
  height: 20px;
}

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

.footer-copyright {
  font-size: 0.875rem;
  opacity: 0.6;
}

.footer-tech {
  font-size: 0.8rem;
  opacity: 0.5;
  margin-top: var(--spacing-xs);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.5px;
}

/* ===== Responsive Design ===== */
@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
}

/* ===== Utility Classes ===== */
.text-center {
  text-align: center;
}

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

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-xl); }
.mt-3 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-xl); }
.mb-3 { margin-bottom: var(--spacing-2xl); }

.py-1 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-2 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }
.py-3 { padding-top: var(--spacing-2xl); padding-bottom: var(--spacing-2xl); }

/* ===== Homepage Sections ===== */

/* Hero Section */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, #eff6ff 0%, #ffffff 50%, #eff6ff 100%);
  padding: 5rem 0 8rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  background-color: rgba(37, 99, 235, 0.1);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 2rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

.hero-title .text-primary {
  color: var(--color-primary);
}

.hero-description {
  max-width: 48rem;
  margin: 0 auto 2.5rem;
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}

.hero-description .text-primary {
  color: var(--color-primary);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 4rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 4rem;
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Hero Carousel */
.hero-carousel {
  position: relative;
  overflow: hidden;
}

.hero-slide {
  display: none;
  animation: fadeIn 0.6s ease-in-out;
}

.hero-slide.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero Articles Grid */
.hero-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 72rem;
  margin: 2rem auto 0;
}

.hero-article-card {
  position: relative;
  background-color: var(--color-bg-primary);
  border-radius: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  text-align: left;
}

.hero-article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.hero-article-cta {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
  border: 2px dashed var(--color-border);
}

.hero-article-cta:hover {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(245, 158, 11, 0.1) 100%);
}

.article-badge {
  display: inline-block;
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.article-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.article-excerpt {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.article-link:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.cta-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-align: center;
}

/* Carousel Controls */
.hero-carousel-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
  color: var(--color-text-primary);
}

.hero-carousel-control:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-50%) scale(1.1);
}

.hero-carousel-control.prev {
  left: 1rem;
}

.hero-carousel-control.next {
  right: 1rem;
}

/* Carousel Indicators */
.hero-carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 3rem;
}

.indicator {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: var(--color-border);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.indicator:hover {
  background-color: var(--color-text-muted);
  transform: scale(1.2);
}

.indicator.active {
  background-color: var(--color-primary);
  width: 2rem;
  border-radius: 9999px;
}

/* Services Section */
.services-section {
  padding: 5rem 0;
  background-color: var(--color-bg-primary);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
}

.section-description {
  max-width: 48rem;
  margin: 0 auto;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.service-card {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  padding: 2rem;
  background-color: var(--color-bg-secondary);
  transition: all var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.service-card-highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
}

.service-card-highlight:hover {
  transform: translateY(-4px) scale(1.02);
}

.service-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border-radius: 9999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
}

.service-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.service-card-highlight .service-title {
  color: white;
}

.service-description {
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: var(--color-text-secondary);
}

.service-card-highlight .service-description {
  color: rgba(255, 255, 255, 0.9);
}

.service-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.service-features li {
  display: flex;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.service-card-highlight .service-features li {
  color: rgba(255, 255, 255, 0.9);
}

.check-icon {
  width: 1.25rem;
  height: 1.25rem;
  margin-right: 0.5rem;
  flex-shrink: 0;
  color: var(--color-primary);
}

.service-card-highlight .check-icon {
  color: white;
}

/* Portfolio Section */
.portfolio-section {
  padding: 5rem 0;
  background-color: var(--color-bg-secondary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.portfolio-card {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  background-color: var(--color-bg-primary);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.portfolio-image {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2) 0%, rgba(245, 158, 11, 0.2) 100%);
  overflow: hidden;
}

.portfolio-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  opacity: 0.5;
}

.portfolio-category {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  background-color: rgba(255, 255, 255, 0.9);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
}

.portfolio-content {
  padding: 1.5rem;
}

.portfolio-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.portfolio-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.portfolio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  border-radius: 9999px;
  background-color: var(--color-bg-secondary);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* Phase 3: Tag/Badge Variants */
.tag-primary {
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  background-color: rgba(37, 99, 235, 0.1);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.tag-light {
  display: inline-block;
  border-radius: 9999px;
  background-color: rgba(255, 255, 255, 0.9);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.tag-outline {
  display: inline-block;
  border-radius: 9999px;
  background-color: transparent;
  border: 1px solid var(--color-primary);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.tag-skill {
  display: inline-block;
  border-radius: 9999px;
  background-color: rgba(37, 99, 235, 0.1);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
}

/* CTA Section */
.cta-section {
  padding: 5rem 0;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.cta-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1.5rem;
}

.cta-description {
  max-width: 48rem;
  margin: 0 auto 2.5rem;
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.9);
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

/* Section CTA */
.section-cta {
  margin-top: 3rem;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: scale(1.05);
  color: white;
}

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

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

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

.btn-white:hover {
  background-color: var(--color-bg-secondary);
  transform: scale(1.05);
  color: var(--color-primary);
}

.btn-outline {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.btn-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-link:hover {
  text-decoration: underline;
  color: var(--color-primary-hover);
}

.arrow-icon {
  width: 1.25rem;
  height: 1.25rem;
  margin-left: 0.5rem;
}

/* ===== Responsive - Homepage Sections ===== */
@media (min-width: 640px) {
  .hero-cta,
  .cta-buttons {
    flex-direction: row;
  }

  .hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3.75rem;
  }

  .section-title,
  .cta-title {
    font-size: 2.5rem;
  }

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

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

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

  .hero-carousel-control.prev {
    left: 2rem;
  }

  .hero-carousel-control.next {
    right: 2rem;
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
  display: block;
  opacity: 1;
}

/* ===== Workflow Step Cards ===== */
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.workflow-card {
  position: relative;
  background-color: white;
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.workflow-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.workflow-number {
  font-size: 3rem;
  font-weight: 700;
  color: rgba(37, 99, 235, 0.2);
  margin-bottom: 1rem;
}

.workflow-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.workflow-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Service Block Responsive Layout ===== */
/* Desktop: 2-column layout (text + visual), Mobile: 1-column */

/* Mobile: hide large visual blocks, show small emoji */
@media (max-width: 1023px) {
  .services-section [style*="aspect-ratio: 1"] {
    display: none !important;
  }
}

/* Desktop: show large visual blocks, hide small emoji */
@media (min-width: 1024px) {
  /* Hide small emoji decorations on desktop */
  .services-section div[style*="font-size: 3rem"][style*="margin-bottom: 1rem"] {
    display: none !important;
  }

  /* Target all service detail blocks in services section */
  .services-section .container > div > div[style*="grid-template-columns: 1fr"] {
    grid-template-columns: 1.5fr 1fr !important;
  }

  /* Limit visual block size on desktop and keep it square */
  .services-section [style*="aspect-ratio: 1"] {
    width: 250px;
    height: 250px;
    aspect-ratio: 1 !important;
    justify-self: center;
  }
}

/* About page mission section */
@media (min-width: 1024px) {
  .services-section .container > div[style*="grid-template-columns: 1fr"] {
    grid-template-columns: 1.5fr 1fr !important;
  }

  .services-section .container > div[style*="grid-template-columns: 1fr"] [style*="aspect-ratio: 1"] {
    width: 250px;
    height: 250px;
  }
}

/* ===== Responsive Grid Utilities ===== */
/* Phase 1: Convert inline grid styles to reusable classes */

.grid-responsive {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-responsive-autofit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-responsive-autofit-lg {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.grid-cols-1 {
  grid-template-columns: 1fr;
}

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

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-gap-sm {
  gap: var(--spacing-md);
}

.grid-gap-md {
  gap: var(--spacing-lg);
}

.grid-gap-lg {
  gap: var(--spacing-xl);
}

.grid-gap-xl {
  gap: var(--spacing-2xl);
}

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

.items-start {
  align-items: start;
}

/* ===== Card Component Classes ===== */
/* Phase 2: Convert inline card styles to reusable components */

.card-base {
  position: relative;
  padding: var(--spacing-xl);
  border-radius: 1rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card-white {
  background-color: var(--color-bg-primary);
  box-shadow: var(--shadow-lg);
}

.card-secondary {
  background-color: var(--color-bg-secondary);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.card-glass {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
}

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

.card-padding-lg {
  padding: var(--spacing-xl);
}

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

/* ===== Contact Page Form Styles ===== */
/* Phase 4: Migrated from contact/index.html <style> block */

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.form-required {
  color: #ef4444;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: none;
  font-family: inherit;
}

.form-button {
  width: 100%;
  background-color: var(--color-primary);
  color: white;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.form-button:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.form-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.success-message {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: #f0fdf4;
  border: 1px solid #86efac;
  border-radius: 0.5rem;
  color: #166534;
  display: none;
}

.success-message.show {
  display: block;
}

.contact-info-card {
  display: flex;
  align-items: center;
  padding: 1.5rem;
  background-color: var(--color-bg-secondary);
  border-radius: 0.75rem;
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.contact-info-card:hover {
  box-shadow: var(--shadow-lg);
}

.contact-info-icon {
  font-size: 2.5rem;
  margin-right: 1rem;
}

.contact-info-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.contact-info-value {
  font-weight: 600;
  color: var(--color-text-primary);
  word-break: break-word;
}

.info-box {
  background-color: var(--color-bg-secondary);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.info-box-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
}

.info-box-icon {
  font-size: 1.5rem;
  margin-right: 0.5rem;
}

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

.hours-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  color: var(--color-text-secondary);
}

.hours-item span:last-child {
  font-weight: 500;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.social-link {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: rgba(0, 185, 0, 0.1);
  color: #00B900; /* LINE brand green */
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: #00B900;
  color: white;
}

.faq-box {
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 0.75rem;
  padding: 1.5rem;
  color: white;
}

.faq-box h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.faq-box p {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: 1rem;
}

.faq-box a {
  display: inline-flex;
  align-items: center;
  color: white;
  font-weight: 600;
  text-decoration: none;
}

.faq-box a:hover {
  text-decoration: underline;
}

/* ===== Efficiency AI Section ===== */
.efficiency-ai-grid {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 3rem;
  align-items: center;
}

.efficiency-ai-avatar {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-self: center;
  gap: 1rem;
  max-width: 250px;
}

.efficiency-ai-avatar-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--color-primary);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.efficiency-ai-avatar-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.efficiency-ai-content h2 {
  text-align: left;
}

@media (max-width: 768px) {
  .efficiency-ai-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .efficiency-ai-avatar {
    max-width: 120px !important;
  }

  .efficiency-ai-avatar-img {
    width: 120px !important;
    height: 120px !important;
    border-width: 3px !important;
  }

  .efficiency-ai-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .efficiency-ai-content h2 {
    text-align: center;
  }
}