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

body {
  font-family: "Pretendard Variable", "Pretendard", -apple-system,
    BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--white);
}

/* Variables */
:root {
  /* Color Palette */
  --primary: #0369a1;
  --secondary: #f0f9ff;
  --accent: #0ea5e9;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --success: #22c55e;
  --error: #ef4444;
  --border: #e2e8f0;

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

/* Typography */
body {
  font-family: "Pretendard Variable", -apple-system, BlinkMacSystemFont,
    system-ui, Roboto, sans-serif;
  color: var(--text-primary);
  line-height: 1.5;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* Layout */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  margin-bottom: var(--spacing-2xl);
}

/* Header */
.header {
  text-align: center;
  padding: 6rem 0;
  background-color: var(--bg-secondary);
  margin-bottom: 4rem;
}

#mainTitle {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.header-buttons {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.header-button {
  display: inline-flex;
  align-items: center;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
  min-width: fit-content;
}

.header-button.primary {
  background-color: var(--primary);
  color: white;
  max-width: 300px;
}

.header-button.primary:hover {
  background-color: var(--accent);
}

/* UTM Parameters Table */
.table-container {
  overflow-x: auto;
  margin: 2rem 0;
}

.utm-params-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

.utm-params-table th,
.utm-params-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.utm-params-table th {
  background-color: var(--bg-secondary);
  font-weight: 600;
}

.utm-params-table code {
  font-family: "Fira Code", monospace;
  background-color: var(--secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  color: var(--primary);
}

/* Campaign Comparison */
.campaign-comparison {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.campaign-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.campaign-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.campaign-header {
  margin-bottom: 1rem;
}

.campaign-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.campaign-performance {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
}

.roas-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.roas-value {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.performance-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
}

.performance-high {
  background-color: var(--success);
  color: white;
}

.performance-medium {
  background-color: var(--accent);
  color: white;
}

.performance-low {
  background-color: var(--error);
  color: white;
}

.campaign-url {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 0.5rem;
}

.url-base {
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.utm-params .param-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.5rem 0;
}

.utm-params strong {
  min-width: 110px;
  color: var(--text-secondary);
}

.utm-params code {
  font-family: "Fira Code", monospace;
  color: var(--primary);
  background: var(--secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
}

/* FAQ Accordion */
.accordion {
  margin: 2rem 0;
}

.accordion-item {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.accordion-header {
  width: 100%;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.accordion-title {
  font-weight: 500;
  color: var(--text-primary);
}

.accordion-icon {
  transition: transform 0.2s ease;
}

.accordion-header[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 1rem 1rem;
  color: var(--text-secondary);
}

.accordion-content[aria-hidden="true"] {
  display: none;
}

/* Bottom CTA */
.bottom-cta-section {
  background-color: var(--bg-secondary);
  padding: 4rem 0;
  margin: 6rem 0 0 0;
  text-align: center;
}

.bottom-cta {
  max-width: 800px;
  margin: 0 auto;
}

.bottom-cta .section-title {
  text-align: center;
  margin-bottom: 1rem;
}

.bottom-cta .section-subtitle {
  text-align: center;
  margin-bottom: 2rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  background-color: var(--primary);
  color: white;
  transition: all 0.2s ease;
}

.cta-button:hover {
  background-color: var(--accent);
  transform: translateY(-2px);
}

/* Responsive Design */
@media (min-width: 768px) {
  .campaign-comparison {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  #mainTitle {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1.25rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .header {
    padding: 3rem 1rem;
  }

  .header-buttons {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .header-button {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .campaign-comparison {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 0.5rem;
  }

  .campaign-card {
    padding: 1rem;
  }

  .campaign-title {
    font-size: 1.125rem;
  }

  .campaign-performance {
    padding: 0.5rem;
    margin-bottom: 1rem;
  }

  .roas-value {
    font-size: 1.125rem;
  }

  .performance-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
  }

  .campaign-url {
    padding: 0.75rem;
  }

  .utm-params strong {
    min-width: 90px;
    font-size: 0.875rem;
  }

  .utm-params code {
    font-size: 0.875rem;
  }

  .accordion-header {
    padding: 0.75rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section {
    margin: 4rem 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .section-subtitle {
    font-size: 1rem;
  }

  .campaign-list {
    grid-template-columns: 1fr;
  }

  .campaign-url code {
    font-size: 0.75rem;
  }

  .bottom-cta-section {
    padding: 3rem 0;
  }
}
/* Utility Classes */
.section-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* 인사이트 섹션 */
.insights-section {
  margin: 4rem auto;
  max-width: 1000px;
  padding: 0 1rem;
}

.insights-section h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  text-align: center;
}

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

.insight-item {
  background-color: var(--white);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.insight-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.insight-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.insight-header i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.insight-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--text-color);
}

.insight-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.example-code {
  background-color: var(--background-light);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
}

.example-code code {
  font-family: "Fira Code", monospace;
  font-size: 0.875rem;
  color: var(--text-color);
  white-space: nowrap;
}

.insight-analysis h4 {
  font-size: 1rem;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.insight-analysis ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.insight-analysis li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-light);
}

.insight-analysis li::before {
  content: "•";
  position: absolute;
  left: 0.5rem;
  color: var(--primary-color);
}

.insights-tips {
  margin-top: 3rem;
  background-color: var(--white);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.insights-tips h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  color: var(--text-color);
  margin-bottom: 1rem;
}

.insights-tips ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.insights-tips li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--text-light);
}

.insights-tips li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary-color);
}

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

  .insight-item {
    padding: 1.25rem;
  }

  .insights-tips {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .insight-header h3 {
    font-size: 1.125rem;
  }

  .example-code {
    padding: 0.75rem;
  }

  .example-code code {
    font-size: 0.75rem;
  }

  .insights-tips h3 {
    font-size: 1.125rem;
  }

  .insights-tips li {
    font-size: 0.875rem;
  }
}

/* FAQ 섹션 */
.faq-section {
  margin: 4rem 0;
}

.faq-section h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: #1e293b;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.accordion-item {
  border: 1px solid #e2e8f0;
  border-radius: 0.75rem;
  overflow: hidden;
  background: #ffffff;
}

.accordion-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  color: #1e293b;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.accordion-header:hover {
  background-color: #f8fafc;
}

.accordion-title {
  font-size: 1.125rem;
  padding-right: 2rem;
}

.accordion-icon {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: #64748b;
}

.accordion-header[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  background-color: #ffffff;
}

.accordion-header[aria-expanded="true"] + .accordion-content {
  max-height: 200px;
  padding: 0 1.25rem 1.25rem;
}

.accordion-content p {
  color: #475569;
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 640px) {
  .accordion-title {
    font-size: 1rem;
  }

  .accordion-header {
    padding: 1rem;
  }

  .accordion-header[aria-expanded="true"] + .accordion-content {
    padding: 0 1rem 1rem;
  }
}

/* 네비게이션 바 */
.navbar {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  gap: 0.5rem;
}

.navbar-logo {
  font-size: 1.5rem;
  line-height: 1;
}

.navbar-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar-item {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: background-color 0.2s ease;
}

.navbar-item:hover {
  background-color: var(--secondary);
  color: var(--primary);
}

.navbar-lang {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 2rem;
}

.lang-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.25rem;
  font-size: 0.875rem;
}

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

.lang-divider {
  color: var(--border);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .navbar-container {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .navbar-menu {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .navbar-lang {
    order: 2;
    margin-left: 0;
  }
}

/* 섹션 스타일 */
.section {
  margin: 6rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
  text-align: left;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  text-align: left;
}

/* 캠페인 비교 섹션 */
.campaign-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.campaign-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  transition: transform 0.2s ease;
}

.campaign-card:hover {
  transform: translateY(-4px);
}

.campaign-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.campaign-roas {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin: 1rem 0;
}

.campaign-star {
  color: #f59e0b;
  margin-left: 0.5rem;
}

/* 모바일 대응 */
@media (max-width: 768px) {
  .navbar-container {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .navbar-menu {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .navbar-lang {
    order: 2;
    margin-left: 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .section-subtitle {
    font-size: 1rem;
  }

  .campaign-list {
    grid-template-columns: 1fr;
  }
}