/* === RESET & CUSTOM PROPERTIES === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 베이지 테마 컬러 토큰 */
  --bg:        #FAF7F2;                  /* 아이보리 — 페이지 기본 배경 */
  --surface:   #F0EBE0;                  /* 연한 베이지 — 카드·강조 섹션 */
  --surface-2: #E6DDD0;                  /* 중간 베이지 — 푸터·호버 */
  --text-1:    #2C2417;                  /* 다크 브라운 — 주요 텍스트 */
  --text-2:    #6F5F42;                  /* 미디엄 브라운 — 보조 텍스트(WCAG AA 전배경: surface 5.21·bg 5.79·surface-2 4.61:1) */
  --accent:    #9A6F2E;                  /* 앰버/골드 — 버튼·번호·링크(장식/대형 3:1 기준) */
  --accent-text: #85601E;                /* 진한 골드 — 라이트 배경 위 본문 텍스트 전용(WCAG AA, surface 위 4.79:1·bg 위 5.33:1) */
  --accent-a:  rgba(154, 111, 46, 0.10); /* 앰버 틴트 — 태그·하이라이트 배경 */
  --border:    #DDD5C4;                  /* 따뜻한 그레이 — 구분선·카드 테두리 */

  /* 레이아웃 */
  --w:  800px;
  --ww: 1100px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px; /* sticky nav 높이만큼 앵커 오프셋 */
}

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic',
               'Apple SD Gothic Neo', sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* === ACCESSIBILITY === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 6px 6px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  z-index: 100;
}
.skip-link:focus { top: 0; }

/* === NAV (sticky) === */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 247, 242, 0.85);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.topnav-inner {
  max-width: var(--ww);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.topnav-brand {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-1);
  text-decoration: none;
  flex-shrink: 0;
}

.topnav-links {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.topnav-links::-webkit-scrollbar { display: none; }

.topnav-links a {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}
.topnav-links a:hover { color: var(--accent); background: var(--accent-a); }
.topnav-links a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* === LAYOUT === */
.container {
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container--wide {
  max-width: var(--ww);
  margin: 0 auto;
  padding: 0 1.5rem;
}

header, section {
  padding: clamp(5rem, 9vw, 7rem) 0;
  border-bottom: 1px solid var(--border);
}

/* === SECTION COMMON === */
.section-heading {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  color: var(--text-1);
}

.section-sub {
  color: var(--text-2);
  font-size: 1rem;
  max-width: 560px;
  margin-bottom: 3rem;
}

/* === HERO === */
#hero {
  background: var(--bg);
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 6rem 0;
}

.hero-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);   /* WCAG AA: bg 위 5.33:1 (기존 --accent 4.19:1 미달 정정) */
  margin-bottom: 1rem;
}

#hero h1 {
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--text-1);
}

.hero-sub {
  color: var(--text-2);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.8rem 1.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: background 0.2s, transform 0.15s;
}
.btn:hover          { background: #7a5520; transform: translateY(-2px); }
.btn:active         { transform: translateY(0); }
.btn:focus-visible  { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn--ghost {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn--ghost:hover { background: var(--accent-a); transform: translateY(-2px); }

/* === STATS BAND === */
.stats-band {
  background: var(--surface);
  padding: clamp(2.5rem, 5vw, 3.5rem) 0;
}
.stats-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  text-align: center;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.stat-num {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-unit { font-size: 0.5em; font-weight: 700; margin-left: 1px; }
.stat-label {
  font-size: 0.9rem;
  color: var(--text-2);
  font-weight: 600;
}

/* === ABOUT === */
#about {
  background: var(--bg);
}

.about-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  align-items: start;
}

/* 이니셜 아바타 (이미지 없을 때) */
.avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-positioning {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.5;
}

.about-bg {
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.75;
}

.role-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: -0.25rem 0 0.25rem;
}
.role-tags li {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-a);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
}

.about-diff {
  font-size: 0.95rem;
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-a);
  border-radius: 0 6px 6px 0;
  color: var(--text-1);
}

.about-cert {
  font-size: 0.875rem;
  color: var(--text-2);
}
.about-cert-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-a);
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
  margin-right: 0.5rem;
}

/* === WORK HISTORY === */
#work-history {
  background: var(--surface);
}

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -4px;
  top: 0.6rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  flex-shrink: 0;
}

.timeline-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}
.timeline-card:hover { border-color: var(--accent); }

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.timeline-org {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-1);
}

.timeline-period {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--surface-2);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  white-space: nowrap;
}

.timeline-role {
  font-size: 0.85rem;
  color: var(--accent-text);   /* WCAG AA: surface 위 4.79:1 (기존 --accent 3.77:1 미달 정정) */
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-contribution {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}

.timeline-summary {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.55;
  margin-bottom: 0.6rem;
}

.timeline-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.2rem;
}
.timeline-points li {
  position: relative;
  padding-left: 0.95rem;
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.6;
}
.timeline-points li::before {
  content: "·";
  position: absolute;
  left: 0.1rem;
  top: -0.05rem;
  color: var(--accent);
  font-weight: 800;
  font-size: 1.1rem;
}

/* === DOMAINS === */
#domains {
  background: var(--bg);
}
.domain-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}
.domain {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: border-color 0.2s, transform 0.2s;
}
.domain:hover { border-color: var(--accent); transform: translateY(-3px); }
.domain-icon { font-size: 1.5rem; line-height: 1; }
.domain-name { font-weight: 700; font-size: 1rem; color: var(--text-1); }
.domain-desc { font-size: 0.85rem; color: var(--text-2); line-height: 1.5; }

/* === KEY PROJECTS === */
#key-projects {
  background: var(--surface);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.project-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color 0.2s, transform 0.2s;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--accent-a);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.3;
}

.project-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 0.1rem;
}

.project-section {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}

.project-result {
  margin-top: auto;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-a);
  border-radius: 0 6px 6px 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.55;
}

/* === AI STRENGTHS === */
#ai-strengths {
  background: var(--bg);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.num {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-a);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
}

.card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-1);
}

.def {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}

.evidence {
  font-size: 0.825rem;
  color: var(--text-1);
  background: var(--surface-2);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  line-height: 1.55;
}

.effect {
  font-size: 0.825rem;
  color: var(--accent-text);   /* WCAG AA: surface 위 4.79:1 (기존 --accent 3.77:1 미달 정정) */
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  line-height: 1.6;
}

/* === SELF-REFERENTIAL PROOF (#ai-strengths) === */
.self-proof-callout {
  max-width: var(--w);
  margin: 0.5rem 0 2rem;
  padding: 0.9rem 1.1rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-1);
  background: var(--accent-a);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
}
.self-proof-callout strong {
  color: var(--text-1);     /* WCAG AA: accent gold on tinted beige < 4.5:1 → 진한 브라운으로 대비 확보 */
  font-weight: 700;
}

.evidence--self {
  background: var(--accent-a);
  border-left: 3px solid var(--accent);
}
.evidence--self strong {
  color: var(--text-1);     /* WCAG AA 대비 확보 (위 .self-proof-callout strong과 동일 사유) */
  font-weight: 700;
}
.evidence--self code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.78rem;
  color: var(--text-1);
  background: rgba(154, 111, 46, 0.14);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
}

/* === WORKFLOW === */
#workflow {
  background: var(--surface);
}

.workflow-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 0.75rem;
  align-items: start;
}

.workflow-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color 0.2s, transform 0.2s;
}
.workflow-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.workflow-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-1);
}

.workflow-desc {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.65;
  flex: 1;
}

.workflow-arrow {
  color: var(--accent);
  font-size: 1.1rem;
  padding-top: 2.6rem;
  flex-shrink: 0;
  align-self: flex-start;
  opacity: 0.5;
}

.workflow-tags {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: 0.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.workflow-tags li {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-a);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  line-height: 1.4;
}

/* === FOOTER === */
footer {
  background: var(--surface-2);
  border-bottom: none;
  border-top: 1px solid var(--border);
  padding: 3.5rem 0;
  text-align: center;
}

.footer-cta {
  color: var(--text-2);
  margin-bottom: 1.5rem;
}

.footer-resume {
  margin-bottom: 1.75rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-1);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 0;
  transition: color 0.2s;
}
.footer-link:hover         { color: var(--accent); }
.footer-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-2);
}

/* === ANIMATIONS === */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* === RESPONSIVE === */
@media (max-width: 720px) {
  /* About: 2열 → 1열 */
  .about-layout {
    grid-template-columns: 1fr;
  }
  .avatar {
    width: 100px;
    height: 100px;
    font-size: 1.75rem;
  }

  /* Timeline: 선 숨김 */
  .timeline::before { display: none; }
  .timeline-dot     { display: none; }
  .timeline-item    { padding-left: 0; }

  /* Workflow: 4열 → 1열 */
  .workflow-grid {
    grid-template-columns: 1fr;
  }
  .workflow-arrow {
    padding-top: 0;
    transform: rotate(90deg);
    justify-self: center;
  }

  /* Hero CTA: 버튼 세로 */
  .hero-cta { flex-direction: column; align-items: flex-start; }
}

/* Nav: 모바일에서 브랜드 숨기고 링크 균등 배치 */
@media (max-width: 560px) {
  .topnav-inner { padding: 0 0.75rem; }
  .topnav-brand { display: none; }
  .topnav-links {
    width: 100%;
    justify-content: space-between;
  }
  .topnav-links a {
    padding: 0.4rem 0.5rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 560px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 1.75rem; }
}

@media (max-width: 500px) {
  .grid          { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .domain-grid   { grid-template-columns: 1fr 1fr; }
}