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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--fs-5xl);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--fs-4xl);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--fs-3xl);
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--lh-relaxed);
}

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

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

/* 모바일 타이포그래피 조정 */
@media (max-width: 767px) {
  h1 {
    font-size: var(--fs-4xl);
  }

  h2 {
    font-size: var(--fs-3xl);
  }

  h3 {
    font-size: var(--fs-2xl);
  }
}

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

.section {
  padding: var(--section-padding-mobile);
  position: relative;
}

@media (min-width: 1024px) {
  .section {
    padding: var(--section-padding-desktop);
  }
}

/* 섹션 헤더 공통 스타일 */
.section-header {
  margin-bottom: var(--spacing-xl);
}

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

.section-header p {
  font-size: var(--fs-lg);
  color: var(--color-text-light);
}

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

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

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

.font-accent {
  font-family: var(--font-accent);
}

/* 버튼 기본 스타일 */
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

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

/* 리스트 */
ul, ol {
  list-style: none;
}

/* 포커스 스타일 */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

::-webkit-scrollbar-track {
  background: var(--color-bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.fade-in-up {
  animation: fadeInUp 0.8s ease-out;
}

/* 스크롤 페이드인 애니메이션 */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.animated {
  opacity: 1;
  transform: translateY(0);
}

.scroll-animate-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate-left.animated {
  opacity: 1;
  transform: translateX(0);
}

.scroll-animate-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate-right.animated {
  opacity: 1;
  transform: translateX(0);
}

/* 반응형 유틸리티 */
.mobile-only {
  display: block;
}

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }

  .desktop-only {
    display: block;
  }
}