/* ============================================================
   디지털 서재 - 공통 디자인 토큰 (A안: 채광 좋은 열람실)
   따뜻한 화이트 배경 + 코발트블루 포인트, 밝고 정돈된 톤
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Pretendard:wght@400;500;600;700;800&display=swap');

:root {
  --paper: #faf9f6;
  --paper-alt: #f1efe7;
  --card: #ffffff;
  --ink: #23262b;
  --ink-dim: #6b7280;
  --ink-faint: #9aa0a8;
  --cobalt: #2a5db0;
  --cobalt-deep: #1f4788;
  --cobalt-soft: #e8eefa;
  --coral: #e8654f;
  --danger: #c4453b;
  --line: rgba(35,38,43,0.10);

  --font-display: 'Pretendard', -apple-system, sans-serif;
  --font-body: 'Pretendard', -apple-system, sans-serif;

  --radius: 10px;
  --shadow-card: 0 2px 6px rgba(35,38,43,0.06), 0 10px 24px -12px rgba(35,38,43,0.12);
  --shadow-card-hover: 0 6px 14px rgba(35,38,43,0.08), 0 18px 32px -14px rgba(35,38,43,0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
::selection { background: var(--cobalt-soft); color: var(--cobalt-deep); }

/* ---------- 상단 헤더 ---------- */
.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 26px clamp(20px, 5vw, 64px) 18px;
  border-bottom: 1px solid var(--line);
}

.site-header .brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header .brand small {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

.site-header nav {
  display: flex;
  gap: 22px;
  font-size: 13px;
  color: var(--ink-dim);
}
.site-header nav a { font-weight: 600; }
.site-header nav a:hover { color: var(--cobalt); }

/* ---------- 버튼 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--cobalt);
  background: transparent;
  color: var(--cobalt);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}
.btn:hover { background: var(--cobalt-soft); }
.btn.solid { background: var(--cobalt); color: #fff; border-color: var(--cobalt); }
.btn.solid:hover { background: var(--cobalt-deep); }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.danger:hover { background: #fbeae8; }
.btn.ghost { border-color: var(--line); color: var(--ink-dim); }
.btn.ghost:hover { border-color: var(--ink-faint); color: var(--ink); }

input, textarea, select {
  background: var(--card);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 10px 12px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--cobalt);
  box-shadow: 0 0 0 3px var(--cobalt-soft);
}
input:focus-visible, textarea:focus-visible, .btn:focus-visible, select:focus-visible {
  outline: 2px solid var(--cobalt);
  outline-offset: 2px;
}

label {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-dim);
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 6px;
}

.footer-credit {
  text-align: center;
  padding: 40px 20px 28px;
  font-size: 11px;
  color: var(--ink-faint);
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}