/* =====================================================
   common.css — 프레이브 공통 스타일
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+KR:wght@400;600;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

/* ── 리셋 & 기본 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:      #118BCC;
  --primary-end:  #11B6BB;
  --grad:         linear-gradient(135deg, #118BCC, #11B6BB);
  --grad-text:    linear-gradient(90deg, #118BCC, #11B6BB);

  --bg:           #080E14;
  --bg-card:      #0D1620;
  --bg-card2:     #111D2A;
  --border:       rgba(17, 139, 204, 0.18);
  --border-light: rgba(255,255,255,0.07);

  --text:         #E8F0F7;
  --text-muted:   #7A9AB5;
  --text-dim:     #3E5A70;

  --font-serif: 'Noto Serif KR', serif;
  --font-sans:  'Noto Sans KR', sans-serif;

  --radius:  12px;
  --radius-sm: 6px;
  --shadow:  0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 24px rgba(17,139,204,0.18);

  --header-h: 64px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

/* ── 그라데이션 텍스트 유틸 ── */
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── 버튼 ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 4px 20px rgba(17,139,204,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(17,139,204,0.5);
}
.btn-outline {
  border: 1px solid var(--border);
  color: var(--primary);
  background: transparent;
}
.btn-outline:hover {
  background: rgba(17,139,204,0.08);
  border-color: var(--primary);
}

/* ── 섹션 공통 ── */
.section {
  padding: 96px 0;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-label {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
  font-weight: 500;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
}
.section-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 560px;
  line-height: 1.8;
}

/* ── 구분선 ── */
.divider {
  width: 48px;
  height: 3px;
  background: var(--grad);
  border-radius: 2px;
  margin: 20px 0 32px;
}

/* ── 페이드인 애니메이션 ── */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ── 스크롤바 ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ── 페이지 상단 여백 (헤더 고정) ── */
.page-top { padding-top: var(--header-h); }

/* ── 로딩 스피너 ── */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 60px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── 반응형 ── */
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  :root { --header-h: 56px; }
}