/* ============================================
   Base Styles — Reset + 기본 타이포그래피
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700;900&display=swap');

*,
*::before,
*::after {
  box-sizing: border-box;
}

* { margin: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: light dark;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--tr-base), color var(--tr-base);
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
}
h1 { font-size: var(--fs-2xl); margin-bottom: var(--sp-4); }
h2 { font-size: var(--fs-xl); margin-bottom: var(--sp-3); }
h3 { font-size: var(--fs-lg); margin-bottom: var(--sp-3); }
h4 { font-size: var(--fs-md); margin-bottom: var(--sp-2); }

p { margin-bottom: var(--sp-3); }

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

ul, ol { padding-left: var(--sp-5); margin-bottom: var(--sp-3); }
li { margin-bottom: var(--sp-1); }

img, svg { max-width: 100%; display: block; }

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

::selection {
  background-color: var(--color-primary);
  color: #fff;
}

/* Scrollbar (dark mode 대응) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--color-surface); }
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary-light); }

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

/* Skip to content (접근성) */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  padding: var(--sp-3) var(--sp-4);
  background: var(--color-primary);
  color: #fff;
  z-index: 100;
}
.skip-link:focus {
  left: var(--sp-3);
  top: var(--sp-3);
}