/* ===========================================
   FASTWEB — 리셋 + 기본 타이포그래피 + 컨테이너
   다크 테마 적용
   =========================================== */

/* =====================
   1. 박스 모델 리셋
   ===================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* =====================
   2. HTML / Body 기본
   ===================== */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-body-lg);
  font-weight: 400;
  line-height: var(--leading-normal);
  color: var(--text-body);
  background-color: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* =====================
   3. 기본 타이포그래피
   ===================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--text-heading);
  word-break: keep-all;
  overflow-wrap: break-word;
}

p, li, dt, dd {
  word-break: keep-all;
  overflow-wrap: break-word;
}

h1 { font-size: var(--text-display-xl); }
h2 { font-size: var(--text-heading-xl); }
h3 { font-size: var(--text-heading-lg); }
h4 { font-size: var(--text-heading-md); }
h5 { font-size: var(--text-body-xl); }
h6 { font-size: var(--text-body-lg); }

p {
  line-height: var(--leading-normal);
  color: var(--text-muted);
}

a {
  color: var(--color-accent-400);
  text-decoration: none;
  transition: color var(--transition-base);
}
a:hover { color: var(--color-accent-500); }

/* =====================
   4. 미디어 기본
   ===================== */
img,
video,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* =====================
   5. 폼 요소 리셋
   ===================== */
button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

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

ul,
ol {
  list-style: none;
}

/* =====================
   6. 컨테이너
   ===================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--container-px-md); }
}
@media (min-width: 1024px) {
  .container { padding-inline: var(--container-px-lg); }
}

/* =====================
   7. 공통 섹션 패딩
   ===================== */
.section {
  padding-block: var(--section-padding-y);
}
.section--sm {
  padding-block: var(--section-padding-y-sm);
}
.section--lg {
  padding-block: var(--section-padding-y-lg);
}

/* 섹션 배경 변형 — 다크 테마 통일 */
.section--dark    { background-color: var(--color-dark-900); }
.section--darker  { background-color: var(--color-dark-800); }
.section--card    { background-color: var(--color-dark-700); }
/* 하위 호환 — 구 클래스명 매핑 */
.section--white   { background-color: var(--color-dark-800); }
.section--neutral { background-color: var(--color-dark-900); }
.section--alt     { background-color: var(--color-dark-800); }
.section--blue-light { background-color: var(--color-accent-50); }
.section--darkest { background-color: var(--color-dark-950); }

/* =====================
   8. 접근성
   ===================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--color-accent-400);
  outline-offset: 2px;
  border-radius: 2px;
}

/* =====================
   9. 스크롤 진입 애니메이션 기본 상태
   ===================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 순차 딜레이 */
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal:nth-child(5) { transition-delay: 0.4s; }
.reveal:nth-child(6) { transition-delay: 0.5s; }

/* 모션 감소 대응 */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}