/* === tokens.css — 공통 디자인 토큰 (Premium) === */
:root {
  /* 공통 폰트 */
  --font-primary: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-modern: 'Noto Sans KR', sans-serif;

  /* 공통 간격 */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 40px;
  --sp-2xl: 64px;
  --sp-3xl: 96px;

  /* 공통 크기 */
  --container-max: 1200px;
  --header-h: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-round: 9999px;

  /* 전환 */
  --ease: cubic-bezier(.4,0,.2,1);
  --ease-out: cubic-bezier(0,.55,.45,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --dur-fast: 150ms;
  --dur: 300ms;
  --dur-slow: 500ms;

  /* 그림자 (레이어드) */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.06);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,.2);

  /* A안 색상 */
  --a-primary: #3b82f6;
  --a-dark: #0a1628;
  --a-accent: #60a5fa;

  /* B안 색상 */
  --b-primary: #0066cc;
  --b-dark: #1a365d;
  --b-light: #f0f4f8;
  --b-accent: #2b6cb0;

  /* C안 색상 */
  --c-primary: #4682B4;
  --c-dark: #2F4F4F;
  --c-light: #87CEEB;
  --c-bg: #f5f5f5;

  /* D안 색상 */
  --d-primary: #1B3A5C;
  --d-accent: #C9A24F;
  --d-dark: #0F2440;
  --d-light: #F5F6F8;

  /* 공통 중립색 */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --black: #000000;
}

/* ── 글로벌 프리미엄 기본 ── */
html { scroll-behavior: smooth; }
*, *::before, *::after { box-sizing: border-box; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }
::selection { background: rgba(59,130,246,.25); color: inherit; }
img { max-width: 100%; height: auto; }

/* 공통 유틸 클래스 */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--sp-md); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-lg); }
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}
.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-xl); align-items: center; }
@media (max-width: 768px) {
  .split { grid-template-columns: 1fr; }
}

/* 공통 버튼 (프리미엄) */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 28px; border-radius: var(--radius-md);
  font-weight: 600; font-size: 15px; letter-spacing: .01em;
  transition: all var(--dur) var(--ease);
  border: 2px solid transparent;
  cursor: pointer; text-align: center;
  position: relative; overflow: hidden;
}
.btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.15) 0%, transparent 50%);
  pointer-events: none;
}
.btn:active { transform: scale(.97); transition-duration: 80ms; }
.btn.primary { background: var(--a-primary, #3b82f6); color: var(--white); box-shadow: 0 2px 8px rgba(59,130,246,.25); }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(59,130,246,.35); }
.btn.ghost { background: transparent; border-color: rgba(255,255,255,.4); color: var(--white); }
.btn.ghost:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.6); transform: translateY(-2px); }
.btn.outline { background: transparent; border-color: var(--a-primary, #3b82f6); color: var(--a-primary, #3b82f6); }
.btn.outline:hover { background: var(--a-primary, #3b82f6); color: var(--white); transform: translateY(-2px); }

/* 포커스 스타일 */
:focus-visible { outline: 2px solid var(--a-primary, #3b82f6); outline-offset: 3px; border-radius: 2px; }
a:focus-visible, button:focus-visible { outline-offset: 2px; }

/* 공통 섹션 */
.section { padding: var(--sp-3xl) 0; }
.section-head { text-align: center; margin-bottom: var(--sp-xl); }
.section-head h2 { font-size: 28px; font-weight: 700; margin-bottom: var(--sp-sm); }
.section-head p { color: var(--gray-500); font-size: 16px; line-height: 1.6; }

/* 공통 카드 (프리미엄) */
.card {
  display: block; padding: var(--sp-lg);
  background: var(--white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--dur) var(--ease);
  border: 1px solid rgba(0,0,0,.04);
  will-change: transform;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
  border-color: transparent;
}