/* global.css - 공통 스타일 정의 */
:root {
  /* 색상 변수 - shadcn UI 컬러 팔레트 기반 */
  --background: 0 0% 100%;
  --foreground: 222.2 84% 4.9%;
  
  --card: 0 0% 100%;
  --card-foreground: 222.2 84% 4.9%;
  
  --popover: 0 0% 100%;
  --popover-foreground: 222.2 84% 4.9%;
  
  --primary: 222.2 47.4% 11.2%;
  --primary-foreground: 210 40% 98%;
  
  --secondary: 210 40% 96.1%;
  --secondary-foreground: 222.2 47.4% 11.2%;
  
  --muted: 210 40% 96.1%;
  --muted-foreground: 215.4 16.3% 46.9%;
  
  --accent: 210 40% 96.1%;
  --accent-foreground: 222.2 47.4% 11.2%;
  
  --destructive: 0 84.2% 60.2%;
  --destructive-foreground: 210 40% 98%;

  --border: 214.3 31.8% 91.4%;
  --input: 214.3 31.8% 91.4%;
  --ring: 222.2 84% 4.9%;

  --radius: 0.5rem;
  
  /* 실제 사용할 컬러값 */
  --background-color: hsl(var(--background));
  --foreground-color: hsl(var(--foreground));
  --primary-color: hsl(var(--primary));
  --primary-foreground-color: hsl(var(--primary-foreground));
  --secondary-color: hsl(var(--secondary));
  --secondary-foreground-color: hsl(var(--secondary-foreground));
  --muted-color: hsl(var(--muted));
  --muted-foreground-color: hsl(var(--muted-foreground));
  --accent-color: hsl(var(--accent));
  --accent-foreground-color: hsl(var(--accent-foreground));
  --border-color: hsl(var(--border));
}

/* 다크 모드 설정 (향후 확장) */
.dark {
  --background: 222.2 84% 4.9%;
  --foreground: 210 40% 98%;
  
  --card: 222.2 84% 4.9%;
  --card-foreground: 210 40% 98%;
  
  --popover: 222.2 84% 4.9%;
  --popover-foreground: 210 40% 98%;
  
  --primary: 210 40% 98%;
  --primary-foreground: 222.2 47.4% 11.2%;
  
  --secondary: 217.2 32.6% 17.5%;
  --secondary-foreground: 210 40% 98%;
  
  --muted: 217.2 32.6% 17.5%;
  --muted-foreground: 215 20.2% 65.1%;
  
  --accent: 217.2 32.6% 17.5%;
  --accent-foreground: 210 40% 98%;
  
  --destructive: 0 62.8% 30.6%;
  --destructive-foreground: 210 40% 98%;
  
  --border: 217.2 32.6% 17.5%;
  --input: 217.2 32.6% 17.5%;
  --ring: 212.7 26.8% 83.9%;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--background-color);
  color: var(--foreground-color);
}

/* 컨테이너 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 그리드 시스템 */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

/* 헤더 스타일 */
header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--background-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.logo {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--foreground-color);
  text-decoration: none;
}

.tagline {
  font-size: 0.875rem;
  color: var(--muted-foreground-color);
}

/* 네비게이션 */
nav {
  display: flex;
  gap: 1rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.5rem;
  padding: 0 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--foreground-color);
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
  background-color: var(--accent-color);
  color: var(--accent-foreground-color);
}

.nav-link.active {
  background-color: var(--primary-color);
  color: var(--primary-foreground-color);
}

/* 버튼 스타일 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  height: 2.5rem;
  padding: 0 1rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

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

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--secondary-foreground-color);
}

.btn-secondary:hover {
  opacity: 0.9;
}

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

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

.btn-lg {
  height: 3rem;
  padding: 0 1.5rem;
  font-size: 1rem;
}

.btn-sm {
  height: 2rem;
  padding: 0 0.75rem;
  font-size: 0.75rem;
}

/* 카드 스타일 */
.card {
  border-radius: var(--radius);
  background-color: var(--card);
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-header {
  padding: 1.5rem 1.5rem 0 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--foreground-color);
}

.card-description {
  color: var(--muted-foreground-color);
  font-size: 0.875rem;
}

.card-content {
  padding: 1.5rem;
}

.card-footer {
  padding: 0 1.5rem 1.5rem 1.5rem;
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* 폼 스타일 */
.form-group {
  margin-bottom: 1.5rem;
}

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

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
textarea,
select {
  width: 100%;
  height: 2.5rem;
  padding: 0 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--input);
  background-color: var(--background-color);
  color: var(--foreground-color);
  font-size: 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none; /* Fix for iOS styling */
}

textarea {
  height: auto;
  min-height: 100px;
  padding: 0.75rem;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--ring);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
}

/* Error state for form elements */
input.error,
textarea.error,
select.error {
  border-color: var(--destructive);
}

input.error:focus,
textarea.error:focus,
select.error:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.1);
}

/* Alert component for form feedback */
.alert {
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.alert.fade-out {
  opacity: 0;
}

/* 섹션 스타일 */
.section {
  padding: 4rem 0;
}

.section:nth-child(even) {
  background-color: var(--muted-color);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--muted-foreground-color);
  margin-bottom: 3rem;
  text-align: center;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* 히어로 섹션 */
.hero {
  padding: 6rem 0;
  text-align: center;
  background-color: var(--background-color);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--muted-foreground-color);
  max-width: 700px;
  margin: 0 auto 2.5rem auto;
}

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

.badge-primary {
  background-color: var(--primary-color);
  color: var(--primary-foreground-color);
}

.badge-secondary {
  background-color: var(--secondary-color);
  color: var(--secondary-foreground-color);
}

.badge-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--foreground-color);
}

/* 푸터 스타일 */
footer {
  background-color: var(--muted-color);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
}

.footer-container {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-section {
  flex: 1;
  min-width: 250px;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-link {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--muted-foreground-color);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--foreground-color);
}

.copyright {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  margin-top: 3rem;
  text-align: center;
  color: var(--muted-foreground-color);
  font-size: 0.875rem;
}

/* 유틸리티 클래스 */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mt-16 { margin-top: 4rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mb-16 { margin-bottom: 4rem; }

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

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

/* 반응형 */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .container {
    padding: 0 1rem;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .hero {
    padding: 4rem 0;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  nav {
    display: none;
  }
  
  nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 50;
  }
  
  .nav-link {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0;
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .footer-container {
    flex-direction: column;
    gap: 2rem;
  }
  
  .footer-section {
    min-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-subtitle {
    font-size: 0.875rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .btn-lg {
    height: 2.75rem;
    padding: 0 1.25rem;
    font-size: 0.875rem;
  }
  
  .card-header, .card-content, .card-footer {
    padding: 1rem;
  }
  
  .card-title {
    font-size: 1.125rem;
  }
}

/* 모바일 메뉴 버튼 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--foreground-color);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* 애니메이션 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

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

.slide-up {
  animation: slideUp 0.5s ease-out;
}

/* 추가 컴포넌트 */
.alert {
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.alert-success {
  background-color: #f0fdf4;
  border-color: #86efac;
  color: #166534;
}

.alert-info {
  background-color: #eff6ff;
  border-color: #93c5fd;
  color: #1e40af;
}

.alert-warning {
  background-color: #fffbeb;
  border-color: #fcd34d;
  color: #92400e;
}

.alert-danger {
  background-color: #fef2f2;
  border-color: #fca5a5;
  color: #991b1b;
}