:root {
  --bg: #050914;
  --panel: #0c1428;
  --fg: #e8eefb;
  --muted: #9fb0cc;
  --accent: #5cc8ff;
  --gold: #ffd77a;
  --line: #1d2b4a;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background-color: var(--bg);
  background-image:
    radial-gradient(1px 1px at 12% 18%, #ffffff 40%, transparent 41%),
    radial-gradient(1px 1px at 78% 8%, #cfe6ff 40%, transparent 41%),
    radial-gradient(1.5px 1.5px at 42% 62%, #ffffff 40%, transparent 41%),
    radial-gradient(1px 1px at 90% 70%, #bfe0ff 40%, transparent 41%),
    radial-gradient(1px 1px at 25% 88%, #ffffff 40%, transparent 41%),
    radial-gradient(1.5px 1.5px at 64% 35%, #ffe9b8 40%, transparent 41%),
    radial-gradient(ellipse at 15% 0%, rgba(40, 90, 200, 0.28), transparent 60%),
    radial-gradient(ellipse at 90% 40%, rgba(160, 80, 220, 0.18), transparent 55%);
  background-attachment: fixed;
  color: var(--fg);
  font-family: "Malgun Gothic", "Apple SD Gothic Neo", system-ui, sans-serif;
  line-height: 1.7;
  word-break: keep-all;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding-inline: 20px;
}

header.top {
  border-bottom: 1px solid var(--line);
  padding-block: 18px;
  background: rgba(5, 9, 20, 0.7);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fg);
  text-decoration: none;
}

.brand span {
  background: linear-gradient(90deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 15px;
}

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

/* 첫 화면 */
.hero {
  padding-block: 72px 56px;
  text-align: center;
}

.hero-art {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(92, 200, 255, 0.2), transparent 60%),
    linear-gradient(180deg, rgba(5, 9, 20, 0.45) 0%, rgba(5, 9, 20, 0.88) 100%),
    url("images/chapter-kepler.jpg") center / cover no-repeat;
  border: 1px solid var(--line);
  border-radius: 18px;
  margin-top: 24px;
  padding-inline: 20px;
  box-shadow: 0 0 60px rgba(92, 200, 255, 0.12);
}

.hero h1 {
  font-size: clamp(32px, 6.5vw, 52px);
  margin: 0 0 12px;
  letter-spacing: 0.03em;
  background: linear-gradient(90deg, #ffffff 0%, var(--accent) 50%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  color: var(--muted);
  margin: 0 auto 28px;
  max-width: 560px;
}

.btn {
  display: inline-block;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  color: #03121f;
  font-weight: 700;
  padding: 14px 30px;
  border-radius: 10px;
  text-decoration: none;
  box-shadow: 0 6px 24px rgba(92, 200, 255, 0.3);
}

.btn:hover { filter: brightness(1.08); }

section {
  padding-block: 44px;
  border-top: 1px solid var(--line);
}

section h2 {
  font-size: 22px;
  margin: 0 0 18px;
  color: var(--fg);
}

section h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  margin-right: 10px;
  vertical-align: -3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--gold));
}

/* 케플러 큰 그림 */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  background:
    radial-gradient(circle at 75% 50%, rgba(255, 160, 90, 0.18), transparent 55%),
    linear-gradient(135deg, #0c1a36, #070d1e);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  overflow: hidden;
}

.feature .tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(255, 215, 122, 0.4);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 12px;
}

.feature h3 {
  font-size: 26px;
  margin: 0 0 10px;
}

.feature p {
  color: var(--muted);
  margin: 0;
}

.planet {
  width: 100%;
  max-width: 340px;
  justify-self: center;
  filter: drop-shadow(0 0 30px rgba(255, 150, 80, 0.35));
  animation: float 7s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.feature-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: 0 10px 40px rgba(92, 200, 255, 0.18);
}

/* 카드 */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

/* 테두리: 파란색에서 금색으로 흐르는 그라데이션 */
.card {
  background:
    linear-gradient(160deg, #111f40, #0a1126) padding-box,
    linear-gradient(135deg, rgba(92, 200, 255, 0.75), rgba(255, 215, 122, 0.45) 55%, rgba(92, 200, 255, 0.12)) border-box;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 16px 16px 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 34px rgba(92, 200, 255, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.card img {
  display: block;
  width: 100%;
  height: 170px;
  object-fit: contain;
  margin-bottom: 12px;
  border-radius: 10px;
  background: radial-gradient(circle at 50% 50%, #1b3262 0%, #050914 80%);
}

.portraits {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  height: 170px;
  margin-bottom: 12px;
  padding: 6px;
  border-radius: 10px;
  background: radial-gradient(circle at 50% 40%, #1b3262 0%, #050914 85%);
}

.portraits img {
  width: 100%;
  height: 100%;
  margin: 0;
  object-fit: contain;
  background: none;
  min-width: 0;
}

.card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.contact p { color: var(--muted); margin: 0; }
.contact a { color: var(--accent); }

footer {
  border-top: 1px solid var(--line);
  padding-block: 24px;
  color: var(--muted);
  font-size: 14px;
}

footer a { color: var(--muted); }

/* 개인정보처리방침 페이지 */
.doc h1 { font-size: 26px; margin: 40px 0 8px; }
.doc .date { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 18px; margin: 28px 0 8px; color: var(--accent); }
.doc p, .doc li { color: var(--fg); }
.doc ul { padding-left: 20px; }

/* 시나리오와 미션: 함교 무대 */
.card.wide { grid-column: 1 / -1; }

.card .stage {
  position: relative;
  height: 240px;
  margin-bottom: 14px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: url("images/bridge.jpg") center / cover no-repeat;
}

.card .stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 9, 20, 0.25) 0%, rgba(5, 9, 20, 0.72) 100%);
}

.card .stage img {
  position: absolute;
  bottom: 0;
  width: auto;
  height: auto;
  margin: 0;
  border-radius: 0;
  background: none;
  object-fit: contain;
}

/* 주인공 (양쪽 끝, 나머지보다 20% 큼: 180px × 1.2 = 216px) */
.card .stage .p-main { height: 216px; max-width: 30%; }
.card .stage .p-left { left: 2%; }
.card .stage .p-right { right: 2%; }

/* 동료들 (가운데, 살짝 겹침) */
.card .stage .p-group {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
}

.card .stage .p-group img {
  position: static;
  height: 180px;
  margin-left: -28px;
}

.card .stage .p-group img:first-child { margin-left: 0; }

/* 휴대폰 */
@media (max-width: 680px) {
  .feature { grid-template-columns: 1fr; text-align: center; }
  .planet { max-width: 240px; }
}

@media (max-width: 480px) {
  nav a { margin-left: 12px; font-size: 14px; }
  .hero { padding-block: 48px 40px; }
  .card .stage { height: 180px; }
  .card .stage .p-main { height: 150px; }
  .card .stage .p-group img { height: 105px; margin-left: -16px; }
}

@media (prefers-reduced-motion: reduce) {
  .planet { animation: none; }
  .card { transition: none; }
}