/* ============================================================
 * index.css — 글로벌 스타일 · 리셋 · 유틸리티
 * theme.css 다음, components.css 이전에 로드.
 * ============================================================ */

/* ---------- Fonts ----------
 * Pretendard: Google Fonts에 없으므로 공식 CDN(JSDelivr) 사용.
 * Noto Sans KR: Google Fonts.
 */
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css");
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700&display=swap");

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

html,
body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd,
ul, ol {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- Base ---------- */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-body-md);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-normal);
  color: var(--color-ink);
  background-color: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Focus ring — DESIGN-OliveYoung.md: 2px Olive Green outer ring */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

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

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

@media (max-width: 1024px) {
  .grid--4,
  .grid--6 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--6 { grid-template-columns: minmax(0, 1fr); }
}

/* Section vertical rhythm */
.section {
  padding-block: var(--space-section);
}

.section--tight {
  padding-block: var(--space-xxl);
}

/* ---------- Scrollbar ---------- */
/* Chromium / WebKit */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface-soft);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-pill);
  border: 2px solid var(--color-surface-soft);
}

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

/* Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-strong) var(--color-surface-soft);
}

/* ---------- Scroll-Trigger Animations ----------
 * 기본 상태(숨김) + .is-visible 클래스 추가 시 전환.
 * IntersectionObserver로 .is-visible 토글하는 JS는 별도 파일.
 */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transition: opacity 0.6s ease-out;
  }
  .fade-in.is-visible {
    opacity: 1;
  }

  .slide-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
  .slide-up.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .slide-left {
    opacity: 0;
    transform: translateX(-24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
  .slide-left.is-visible {
    opacity: 1;
    transform: translateX(0);
  }

  .slide-right {
    opacity: 0;
    transform: translateX(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
  .slide-right.is-visible {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .slide-up,
  .slide-left,
  .slide-right {
    opacity: 1;
    transform: none;
    transition: none;
  }
}