/* =============================================================
   TOPIK Pro - Trustworthy Korean Care Theme
   Learn Korean. Heal in Korea.
   ============================================================= */

/* ==================== 컬러 시스템 ==================== */
:root {
  /* Primary Colors - 신뢰·전문성 */
  --medical-blue: #2F6FDB;
  --soft-mint: #4FD1C5;
  
  /* Secondary Colors - 배경·구획 */
  --warm-beige: #F5F2EE;
  --light-gray: #E5E7EB;
  --deep-navy: #1E2A44;
  
  /* Accent Colors - CTA·강조 */
  --calm-coral: #FF8A7A;
  --gold-sand: #D6B98C;
  
  /* Neutral Colors */
  --pure-white: #FFFFFF;
  --text-primary: #1E2A44;
  --text-secondary: #6B7280;
  --border-light: #E5E7EB;
}

/* ==================== 기본 스타일 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--pure-white);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ==================== 부드러운 배경 그라데이션 ==================== */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, 
    rgba(79, 209, 197, 0.05) 0%, 
    rgba(255, 255, 255, 1) 50%,
    rgba(47, 111, 219, 0.05) 100%
  );
  pointer-events: none;
  z-index: 0;
}

/* ==================== 네비게이션 바 ==================== */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--medical-blue);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.logo::before {
  content: '🏥';
  font-size: 1.8rem;
}

.logo:hover {
  color: var(--soft-mint);
  transform: translateY(-2px);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--medical-blue);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--medical-blue);
}

.nav-links a:hover::after {
  width: 100%;
}

/* ==================== 히어로 섹션 ==================== */
.hero-section {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  z-index: 10;
}

.hero-content {
  max-width: 1000px;
  z-index: 100;
}

.hero-title {
  font-size: clamp(1.2rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--deep-navy);
  margin-bottom: 2rem;
  line-height: 1.8;
  letter-spacing: -0.01em;
}

.hero-title span:first-child {
  display: block;
  font-size: 1.3em;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.hero-title span:last-child {
  display: block;
  font-size: 0.8em;
  font-weight: 500;
  opacity: 0.85;
}

.hero-title .highlight {
  color: var(--medical-blue);
  position: relative;
  display: inline-block;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 8px;
  background: linear-gradient(90deg, var(--soft-mint) 0%, var(--medical-blue) 100%);
  opacity: 0.3;
  z-index: -1;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
  font-weight: 400;
}

.hero-cta {
  display: inline-flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* ==================== 버튼 스타일 ==================== */
.btn {
  padding: 1rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-primary {
  background: white !important;
  color: white !important;
  border: 2px solid white !important;
}

.btn-primary:hover {
  background: white !important;
  color: white !important;
  border: 2px solid white !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
  background: white !important;
  color: white !important;
  border: 2px solid white !important;
}

.btn-secondary:hover {
  background: white !important;
  color: white !important;
  border: 2px solid white !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

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

.btn-outline:hover {
  background: white !important;
  color: white !important;
  border: 2px solid white !important;
}

/* ==================== 섹션 공통 스타일 ==================== */
.section {
  padding: 6rem 2rem;
  position: relative;
  z-index: 10;
}

.section-title {
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 700;
  color: var(--deep-navy);
  text-align: center;
  margin-bottom: 0.8rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 4rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

/* ==================== 카드 그리드 ==================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--pure-white);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--soft-mint) 0%, var(--medical-blue) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--deep-navy);
  margin-bottom: 1rem;
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

/* ==================== 서비스 영역별 색상 ==================== */
/* 교육 영역 - Mint + Beige */
.section-education {
  background: var(--warm-beige);
}

.section-education .card-icon {
  background: linear-gradient(135deg, var(--soft-mint) 0%, #3BB8AD 100%);
}

.section-education .btn-primary {
  background: var(--soft-mint);
  color: var(--deep-navy);
}

.section-education .btn-primary:hover {
  background: #3BB8AD;
}

/* 의료 영역 - Medical Blue + White */
.section-medical {
  background: var(--pure-white);
}

.section-medical .card-icon {
  background: linear-gradient(135deg, var(--medical-blue) 0%, #1E50C0 100%);
}

/* 관광 영역 - Beige + Gold */
.section-tourism {
  background: linear-gradient(135deg, var(--warm-beige) 0%, rgba(214, 185, 140, 0.1) 100%);
}

.section-tourism .card-icon {
  background: linear-gradient(135deg, var(--gold-sand) 0%, #C4A876 100%);
}

.section-tourism .card-title {
  color: var(--deep-navy);
}

/* ==================== 언어 선택기 ==================== */
.lang-selector {
  position: fixed;
  top: 1rem;
  right: 2rem;
  z-index: 1000;
  display: block !important;
}

.lang-select {
  background: var(--pure-white);
  border: 2px solid var(--medical-blue);
  color: var(--text-primary);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(47, 111, 219, 0.2);
  min-width: 120px;
}

.lang-select:hover {
  border-color: var(--medical-blue);
  box-shadow: 0 4px 12px rgba(47, 111, 219, 0.3);
  transform: translateY(-2px);
}

/* ==================== 반응형 디자인 (모바일 우선) ==================== */
@media (max-width: 768px) {
  .navbar-container {
    padding: 1rem;
  }

  .nav-links {
    display: none;
  }

  .hero-section {
    padding: 6rem 1rem 3rem;
    min-height: 80vh;
  }

  .section {
    padding: 4rem 1rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .hero-cta {
    flex-direction: column;
    gap: 1rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ==================== 로딩 애니메이션 ==================== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--pure-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.5s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--light-gray);
  border-top-color: var(--medical-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ==================== 스크롤바 커스터마이징 ==================== */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--warm-beige);
}

::-webkit-scrollbar-thumb {
  background: var(--medical-blue);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--soft-mint);
}

/* ==================== 접근성 (WCAG 준수) ==================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* 포커스 스타일 */
*:focus-visible {
  outline: 3px solid var(--medical-blue);
  outline-offset: 2px;
}

/* ==================== 프린트 스타일 ==================== */
@media print {
  .navbar,
  .lang-selector,
  .loading-overlay {
    display: none;
  }
}