/* ============================================
   CleanBot v4.0 - Global Styles
   Logo color reference: CLEAN(slate gray) + BOT(electric blue)
   ============================================ */

:root {
  --bg-deep:    #04070e;
  --bg-1:       #070d1b;
  --bg-2:       #0c1530;
  --bg-card:    rgba(13, 22, 45, 0.72);
  --bg-card-2:  rgba(20, 32, 64, 0.55);
  --line:       rgba(95, 165, 255, 0.18);
  --line-hot:   rgba(95, 165, 255, 0.45);

  /* 로고 컬러 (그록 로고 기반) */
  --clean-gray: #3a4252;        /* CLEAN 부분 - 다크 슬레이트 */
  --clean-gray-2: #5a6678;      /* CLEAN 하이라이트 */
  --bot-blue:   #1e7fff;        /* BOT 부분 - 일렉트릭 블루 */
  --bot-blue-2: #4ea6ff;        /* BOT 하이라이트 */

  --accent:     #4ea6ff;
  --accent-2:   #76e8ff;
  --accent-3:   #b5d8ff;
  --warn:       #ffb84e;
  --danger:     #ff6b6b;
  --ok:         #4eff9c;
  --text:       #e8efff;
  --text-mute:  #8fa3c8;
  --text-soft:  #b9c7e0;

  --display: 'Orbitron', system-ui, sans-serif;
  --korean:  'IBM Plex Sans KR', 'Apple SD Gothic Neo', system-ui, sans-serif;
  --soft:    'Gowun Dodum', 'IBM Plex Sans KR', system-ui, sans-serif;
  --mono:    'JetBrains Mono', 'Fira Code', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-deep);
  color: var(--text);
  font-family: var(--korean);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }

/* ========== 배경 ========== */
.cosmos {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(40, 80, 180, 0.28) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(78, 166, 255, 0.18) 0%, transparent 70%),
    radial-gradient(ellipse 100% 50% at 50% 100%, rgba(118, 232, 255, 0.08) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-1) 40%, var(--bg-deep) 100%);
}
.stars { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.stars::before, .stars::after {
  content: ''; position: absolute; inset: -50%;
  background-image:
    radial-gradient(1px 1px at 20px 30px, #fff, transparent),
    radial-gradient(1px 1px at 40px 70px, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 90px 40px, var(--accent-2), transparent),
    radial-gradient(1px 1px at 160px 120px, #fff, transparent),
    radial-gradient(1px 1px at 210px 50px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 260px 180px, var(--accent-2), transparent),
    radial-gradient(1px 1px at 320px 90px, #fff, transparent);
  background-repeat: repeat;
  background-size: 350px 220px;
  opacity: 0.5;
  animation: drift 120s linear infinite;
}
.stars::after {
  background-size: 500px 320px;
  animation-duration: 200s;
  animation-direction: reverse;
  opacity: 0.3;
}
@keyframes drift {
  from { transform: translate(0, 0); }
  to   { transform: translate(-350px, -220px); }
}

/* ========== 네비 ========== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(4, 7, 14, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--display);
  font-weight: 900;
  letter-spacing: 0.04em;
  font-size: 18px;
}
.nav-brand-clean {
  background: linear-gradient(180deg, var(--clean-gray-2) 0%, var(--clean-gray) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-brand-bot {
  background: linear-gradient(180deg, var(--bot-blue-2) 0%, var(--bot-blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links {
  display: flex;
  gap: 2px;
  list-style: none;
}
.nav-links a {
  color: var(--text-mute);
  text-decoration: none;
  padding: 8px 14px;
  font-size: 14px;
  border-radius: 8px;
  transition: all 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--text); background: rgba(78,166,255,0.08); }
.nav-links a.active {
  color: var(--accent-2);
  background: rgba(78,166,255,0.1);
}
.nav-cta {
  background: linear-gradient(135deg, var(--bot-blue-2) 0%, var(--bot-blue) 100%);
  color: #fff;
  text-decoration: none;
  padding: 9px 18px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 6px 18px -4px rgba(30,127,255,0.5);
  transition: transform 0.2s;
  font-family: var(--korean);
}
.nav-cta:hover { transform: translateY(-1px); }

/* 모바일 메뉴 토글 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--text);
  width: 36px; height: 36px;
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 18px; height: 18px; }

/* ========== 컨테이너 ========== */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 페이지 헤더(타이틀) ========== */
.page-head {
  padding: 80px 0 56px;
  text-align: center;
  position: relative;
}
.page-head .eyebrow {
  display: inline-block;
  font-family: var(--display);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.3em;
  font-size: 12px;
  margin-bottom: 16px;
}
.page-head h1 {
  font-family: var(--korean);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 52px);
  letter-spacing: -0.015em;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.2;
}
.page-head h1 .accent {
  background: linear-gradient(90deg, var(--bot-blue-2), var(--bot-blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-head p {
  color: var(--text-mute);
  font-size: 16px;
  max-width: 680px;
  margin: 0 auto;
}
.page-body {
  padding: 0 0 80px;
}

/* ========== 버튼 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 11px;
  font-family: var(--korean);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--bot-blue-2) 0%, var(--bot-blue) 100%);
  color: #fff;
  box-shadow: 0 8px 24px -6px rgba(30, 127, 255, 0.6), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px -6px rgba(30, 127, 255, 0.8), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-ghost {
  background: rgba(13, 22, 45, 0.6);
  color: var(--text);
  border-color: var(--line-hot);
}
.btn-ghost:hover {
  background: rgba(78, 166, 255, 0.08);
  border-color: var(--accent);
  transform: translateY(-2px);
}
.btn svg { width: 18px; height: 18px; }

/* ========== Footer ========== */
footer {
  padding: 48px 0 36px;
  border-top: 1px solid var(--line);
  margin-top: auto;
  background: rgba(4, 7, 14, 0.5);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .nav-brand { font-size: 22px; }
.footer-brand p {
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.7;
  margin-top: 14px;
  max-width: 280px;
}
.footer-col h5 {
  font-family: var(--display);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 700;
}
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: var(--text-mute);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent-2); }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  color: var(--text-mute);
  font-size: 13px;
  margin-bottom: 6px;
}
.footer-bottom .v {
  font-family: var(--display);
  color: var(--accent);
  letter-spacing: 0.2em;
  font-size: 11px;
  margin-top: 12px;
}

/* ========== 카드 공통 ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  transition: all 0.3s;
}
.card:hover {
  border-color: var(--line-hot);
}

/* ========== 코드 ========== */
code.inline {
  font-family: var(--mono);
  background: rgba(78,166,255,0.1);
  color: var(--accent-2);
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 13px;
}

/* ========== fade in ========== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 반응형 ========== */
@media (max-width: 920px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .page-head { padding: 56px 0 40px; }
}
@media (max-width: 540px) {
  .footer-grid { grid-template-columns: 1fr; }
  .page-head { padding: 44px 0 32px; }
  .nav-cta { padding: 7px 13px; font-size: 13px; }
}