:root {
  /* 라이트 모드 (Default) */
  --bg-color: oklch(0.98 0.01 160);
  --card-bg: oklch(1 0 0);
  --primary: oklch(0.45 0.1 160);
  --primary-glow: oklch(0.45 0.1 160 / 0.15);
  --secondary: oklch(0.85 0.15 85);
  --text-main: oklch(0.2 0.05 160);
  --text-dim: oklch(0.45 0.05 160);
  --accent: oklch(0.4 0.1 40);

  --radius-lg: 24px;
  --radius-md: 12px;
  --shadow-deep: 0 15px 40px -10px oklch(0 0 0 / 0.08);
  --shadow-glow: 0 0 20px var(--primary-glow);
  --font-main: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* 반응형을 위한 변수 추가 */
  --container-max: 900px;
  --side-padding: 5%;
}

[data-theme="dark"] {
  --bg-color: oklch(0.15 0.02 160);
  --card-bg: oklch(0.22 0.03 160);
  --primary: oklch(0.85 0.15 85);
  --primary-glow: oklch(0.85 0.15 85 / 0.3);
  --secondary: oklch(0.5 0.1 160);
  --text-main: oklch(0.95 0.02 85);
  --text-dim: oklch(0.75 0.03 160);
  --accent: oklch(0.7 0.12 40);
  --shadow-deep: 0 20px 50px -10px oklch(0 0 0 / 0.5);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden; /* 가로 스크롤 방지 */
}

/* 유동적인 메인 컨테이너 */
#main-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--side-padding);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  z-index: 100;
}

h1, h2, h3 { font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; }

/* 폰트 사이즈 반응형 대응 */
@media (max-width: 600px) {
  :root {
    --radius-lg: 16px;
    --side-padding: 15px;
  }
  h1 { font-size: 1.5rem !important; }
}