/* =========================================================
   디자인 토큰 — 색상·간격·폰트는 전부 여기서만 바꿉니다.
   개별 규칙 안의 값을 직접 고치지 마세요.
   ========================================================= */
:root {
  /* 색상 */
  --color-bg:          #ffffff;
  --color-bg-alt:      #f6f7f9;
  --color-text:        #14171a;
  --color-text-muted:  #5b6570;
  --color-border:      #e3e6ea;
  --color-accent:      #2563eb;
  --color-accent-text: #ffffff;

  /* 타이포그래피 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Pretendard",
               "Apple SD Gothic Neo", "Segoe UI", "Malgun Gothic",
               "Noto Sans KR", sans-serif;
  --line-height: 1.7;

  /* 레이아웃 */
  --container-width: 1080px;
  --section-padding: clamp(4rem, 10vw, 7rem);
  --radius: 12px;
}

/* 다크 모드 — 방문자 기기 설정을 따릅니다. */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:         #0b0d10;
    --color-bg-alt:     #14181d;
    --color-text:       #f2f4f6;
    --color-text-muted: #9aa5b1;
    --color-border:     #262c34;
    --color-accent:     #5b8dff;
    --color-accent-text: #0b0d10;
  }
}

/* =========================================================
   기본 스타일
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.3; margin: 0 0 0.5em; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 4vw, 2.4rem); }
h3 { font-size: 1.1rem; }
p  { margin: 0 0 1em; }

a { color: inherit; }

img { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =========================================================
   헤더
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.nav { display: flex; gap: 1.5rem; }

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav a:hover { color: var(--color-text); }

/* 모바일에서는 네비게이션을 숨깁니다. */
@media (max-width: 640px) {
  .nav { display: none; }
}

/* =========================================================
   히어로
   ========================================================= */
.hero {
  padding: clamp(5rem, 14vw, 9rem) 0 var(--section-padding);
}

.eyebrow {
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.lead {
  color: var(--color-text-muted);
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  max-width: 48ch;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* =========================================================
   버튼
   ========================================================= */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
}

.btn-primary:hover { opacity: 0.88; }

.btn-ghost {
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-ghost:hover { background: var(--color-bg-alt); }

/* =========================================================
   섹션
   ========================================================= */
.section { padding: var(--section-padding) 0; }

.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-label {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section h2 { margin-bottom: 2.5rem; }

/* =========================================================
   소개 그리드
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem;
}

.about-item h3 { margin-bottom: 0.4rem; }
.about-item p  { color: var(--color-text-muted); margin: 0; }

/* =========================================================
   카드 그리드 — 프로젝트 / 팀 공용
   ========================================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.card p { color: var(--color-text-muted); }

.card-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}

.card-link:hover { text-decoration: underline; }

/* 프로젝트 상태 배지 */
.status {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.status-live {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 40%, transparent);
}

.status-beta { color: var(--color-text); }

.status-soon { opacity: 0.7; }

/* =========================================================
   팀 카드
   ========================================================= */
.member {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  background: var(--color-bg);
}

.avatar {
  width: 56px;
  height: 56px;
  margin-bottom: 1rem;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--color-text-muted);
}

.member h3 { margin-bottom: 0.15rem; }

.member .role {
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.member p:last-child { color: var(--color-text-muted); margin: 0; }

/* =========================================================
   연락 / 푸터
   ========================================================= */
.contact-inner { text-align: center; }
.contact-inner .lead { margin: 0 auto 2rem; }
.contact-inner h2 { margin-bottom: 0.75rem; }

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
}

.footer-inner p { margin: 0; }

/* =========================================================
   접근성
   ========================================================= */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}