/* ============================================================
   NextFlow — 공용 스타일
   외부 리소스 0 (폰트/CDN/이미지 없음). Render 정적 배포용.
   ============================================================ */

:root {
  --bg:           #ffffff;
  --bg-soft:      #f5f7fa;
  --bg-deep:      #0d1424;
  --surface:      #ffffff;
  --fg:           #131722;
  --fg-muted:     #566072;
  --fg-faint:     #7c8698;
  --line:         #e2e6ec;
  --accent:       #2563eb;
  --accent-deep:  #1d4ed8;
  --accent-soft:  #eef3fe;
  --on-dark:      #f2f5fa;
  --on-dark-mute: #a9b4c7;
  --radius:       14px;
  --maxw:         1080px;
  --shadow:       0 1px 2px rgba(19,23,34,.04), 0 8px 24px rgba(19,23,34,.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0e1117;
    --bg-soft:     #151922;
    --surface:     #161b25;
    --fg:          #eceff5;
    --fg-muted:    #a2acbd;
    --fg-faint:    #7b8494;
    --line:        #252b37;
    --accent:      #6b9bff;
    --accent-deep: #8fb4ff;
    --accent-soft: #172032;
    --shadow:      0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo",
               "Noto Sans KR", "Malgun Gothic", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  word-break: keep-all;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------- 상단 내비게이션 ---------------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; min-height: 66px; flex-wrap: wrap;
}
.logo { display: flex; align-items: baseline; gap: 9px; padding: 10px 0; }
.logo-mark {
  font-size: 20px; font-weight: 750; letter-spacing: -.025em; color: var(--fg);
}
.logo-ko { font-size: 12.5px; color: var(--fg-faint); letter-spacing: .02em; }

.nav-links { display: flex; gap: 4px; flex-wrap: wrap; padding-bottom: 6px; }
.nav-links a {
  color: var(--fg-muted); font-size: 14.5px; font-weight: 500;
  padding: 8px 13px; border-radius: 8px; white-space: nowrap;
}
.nav-links a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.nav-links a.active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* ---------------- 히어로 ---------------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 12% -10%, rgba(37,99,235,.20), transparent 62%),
    radial-gradient(900px 480px at 88% 8%,  rgba(14,165,233,.16), transparent 60%),
    linear-gradient(168deg, #0d1424 0%, #16233d 52%, #101a2e 100%);
  color: var(--on-dark);
  padding: 96px 0 88px;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 10%, transparent 78%);
          mask-image: radial-gradient(circle at 50% 30%, #000 10%, transparent 78%);
}
.hero .wrap { position: relative; z-index: 1; }
.eyebrow {
  display: inline-block; margin: 0 0 20px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .13em; text-transform: uppercase;
  color: #9dc0ff;
  border: 1px solid rgba(157,192,255,.32); border-radius: 999px; padding: 5px 14px;
}
.hero h1 {
  margin: 0 0 22px; font-weight: 750; letter-spacing: -.03em;
  font-size: clamp(30px, 5.4vw, 50px); line-height: 1.28;
}
.hero .lead {
  margin: 0; max-width: 62ch; font-size: clamp(16px, 2.1vw, 18.5px);
  color: var(--on-dark-mute); line-height: 1.85;
}
.hero-actions { margin-top: 34px; display: flex; gap: 12px; flex-wrap: wrap; }

.hero.compact { padding: 66px 0 58px; }
.hero.compact h1 { font-size: clamp(26px, 4.2vw, 38px); margin-bottom: 14px; }

.btn {
  display: inline-block; border-radius: 10px; padding: 12px 24px;
  font-size: 15px; font-weight: 600; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); }
.btn-ghost { border-color: rgba(255,255,255,.26); color: var(--on-dark); }
.btn-ghost:hover { background: rgba(255,255,255,.08); }

/* ---------------- 섹션 ---------------- */
section { padding: 76px 0; }
section + section { border-top: 1px solid var(--line); }
section.tinted { background: var(--bg-soft); }

.sec-label {
  margin: 0 0 12px; font-size: 12.5px; font-weight: 650;
  letter-spacing: .12em; text-transform: uppercase; color: var(--accent);
}
h2 {
  margin: 0 0 18px; font-size: clamp(23px, 3.2vw, 30px);
  font-weight: 700; letter-spacing: -.022em; line-height: 1.4;
}
.sec-lead { margin: 0 0 40px; max-width: 64ch; color: var(--fg-muted); font-size: 16.5px; }

h3 { margin: 0 0 10px; font-size: 17.5px; font-weight: 650; letter-spacing: -.01em; }
p  { margin: 0 0 14px; }
p:last-child { margin-bottom: 0; }

/* ---------------- 카드 그리드 ---------------- */
.grid { display: grid; gap: 20px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(248px, 1fr)); }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
}
.card p { color: var(--fg-muted); font-size: 15px; }
.card-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; margin-bottom: 16px;
  border-radius: 9px; background: var(--accent-soft); color: var(--accent);
  font-size: 14px; font-weight: 700;
}

/* ---------------- 정의형 표 ---------------- */
.deflist { margin: 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.defrow {
  display: grid; grid-template-columns: 190px 1fr; gap: 8px 24px;
  padding: 15px 2px; border-bottom: 1px solid var(--line); align-items: baseline;
}
.defrow dt { margin: 0; color: var(--fg-faint); font-size: 14.5px; font-weight: 500; }
.defrow dd { margin: 0; font-size: 15.5px; }
@media (max-width: 620px) {
  .defrow { grid-template-columns: 1fr; gap: 2px; padding: 13px 2px; }
}

/* ---------------- 목록 ---------------- */
.ticks { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 27px; color: var(--fg-muted); font-size: 15.5px; }
.ticks li::before {
  content: ""; position: absolute; left: 4px; top: .68em;
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
}
.ticks strong { color: var(--fg); font-weight: 600; }

/* ---------------- 배지 ---------------- */
.badge {
  display: inline-block; background: var(--accent-soft); color: var(--accent);
  border-radius: 999px; padding: 5px 14px; font-size: 13px; font-weight: 600;
}

/* ---------------- 푸터 ---------------- */
footer {
  background: var(--bg-deep); color: #b9c4d6;
  padding: 54px 0 46px;
}
footer .f-brand { display: flex; align-items: baseline; gap: 9px; margin-bottom: 22px; }
footer .f-brand .logo-mark { color: #fff; font-size: 18px; }
footer .f-brand .logo-ko { color: #7f8da0; }

.f-nav { margin: 0 0 26px; font-size: 14px; display: flex; flex-wrap: wrap; gap: 6px 22px; }
.f-nav a { color: #b9c4d6; }
.f-nav a:hover { color: #fff; }

.legal-title {
  margin: 0 0 10px; font-size: 12px; font-weight: 650;
  letter-spacing: .1em; text-transform: uppercase; color: #6f7c91;
}
.legal { margin: 0 0 20px; font-size: 13.5px; line-height: 2.1; color: #99a5b8; }
.legal span { white-space: nowrap; }
.legal .sep { color: #3a465c; margin: 0 10px; }

.f-links { margin: 0 0 18px; font-size: 13.5px; display: flex; flex-wrap: wrap; gap: 6px 20px; }
.f-links a { color: #b9c4d6; }
.copyright { margin: 0; font-size: 12.5px; color: #6f7c91; }

@media (max-width: 620px) {
  .legal .sep { display: none; }
  .legal span { display: block; }
  .hero { padding: 68px 0 60px; }
  section { padding: 56px 0; }
}