/* ============================================
   디자인 시스템 v2 — "군더더기 없는 신뢰"
   참고: 토스 / 네이버 / 정부24 / Stripe
   ============================================ */
:root {
  /* Color */
  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-primary-soft: #EFF6FF;
  --color-background: #F8FAFC;
  --color-card: #FFFFFF;
  --color-card-alt: #F8FAFC;
  --color-border: #E5E7EB;
  --color-text-primary: #111827;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;
  --color-success: #16A34A;
  --color-success-soft: #F0FDF4;
  --color-error: #DC2626;
  --color-error-soft: #FEF2F2;

  /* Typography */
  --font-body: "Pretendard", "Noto Sans KR", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --fs-h1: 32px;
  --fs-h1-mobile: 26px;
  --fs-h2: 24px;
  --fs-h2-mobile: 20px;
  --fs-h3: 18px;
  --fs-body: 16px;
  --fs-caption: 13px;
  --fs-button: 15px;
  --fs-result-total: 28px;
  --fs-result-line: 17px;

  /* Spacing (8pt system) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 40px;
  --space-7: 48px;
  --space-8: 64px;

  /* Radius */
  --radius-button: 10px;
  --radius-input: 10px;
  --radius-card: 16px;
  --radius-alert: 8px;

  /* Layout */
  --content-max: 1200px;
  --content-narrow: 760px;

  /* Motion */
  --ease-standard: cubic-bezier(0.22, 0.61, 0.36, 1);
  --duration-fast: 100ms;
  --duration-base: 150ms;

  --shadow-card: 0 1px 2px rgba(17, 24, 39, 0.04);

  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-background);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--duration-base) var(--ease-standard),
              color var(--duration-base) var(--ease-standard);
}

h1, h2, h3 {
  font-family: var(--font-body);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1-mobile); font-weight: 700; line-height: 1.3; }
h2 { font-size: var(--fs-h2-mobile); font-weight: 700; line-height: 1.35; margin-top: var(--space-8); }
h3 { font-size: var(--fs-h3); font-weight: 600; line-height: 1.4; margin-top: var(--space-5); }

@media (min-width: 768px) {
  h1 { font-size: var(--fs-h1); }
  h2 { font-size: var(--fs-h2); }
}

p { margin: 0 0 var(--space-3); color: var(--color-text-secondary); }
a { color: inherit; }

.wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 20px;
}

.wrap--narrow { max-width: var(--content-narrow); }

.eyebrow {
  font-size: var(--fs-caption);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-2);
}

.section-title { font-weight: 700; }
.section-title--sm { font-size: var(--fs-h3); margin-top: 0; }

.calc-note {
  font-size: var(--fs-caption);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.formula {
  font-size: var(--fs-caption);
  background: var(--color-card-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-alert);
  padding: var(--space-3);
  color: var(--color-text-secondary);
  overflow-x: auto;
}

/* 결과·통계 숫자는 자릿수를 맞춰 표시 */
.num, .result-box__num, .calc-field__input {
  font-variant-numeric: tabular-nums;
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}