/* =========================
   GAON SEJONG — Space System
   Title: Orbitron / Body: Pretendard
   ========================= */

/* Fonts */
@import url("https://fonts.googleapis.com/css2?family=Orbitron:wght@500;600;700&display=swap");
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css");

:root{
  --bg0:#050712;
  --bg1:#070b1f;
  --txt:#eaf0ff;
  --muted:rgba(234,240,255,.72);

  --glass:rgba(10,14,30,.42);
  --glass2:rgba(10,14,30,.58);
  --stroke:rgba(170,190,255,.18);

  --cyan:#46e6ff;
  --gold:#ffcc66;

  --shadow: 0 18px 60px rgba(0,0,0,.45);
  --blur: 18px;

  --radius:18px;
  --container:1100px;
}

/* Reset */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--txt);
  background: radial-gradient(1200px 800px at 70% 0%, rgba(70,230,255,.12), transparent 55%),
              radial-gradient(1100px 900px at 0% 80%, rgba(255,204,102,.10), transparent 60%),
              linear-gradient(180deg, var(--bg0), var(--bg1));
  font-family: Pretendard, system-ui, -apple-system, Segoe UI, Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  letter-spacing:-.2px;
  line-height:1.55;
  overflow-x:hidden;
}

/* Ambient background layer (image + noise + vignette) */
.bg-ambient{
  position:fixed;
  inset:0;
  z-index:-3;
  background:
    radial-gradient(1200px 900px at 50% 0%, rgba(70,230,255,.10), transparent 60%),
    radial-gradient(900px 800px at 0% 100%, rgba(255,204,102,.08), transparent 55%),
    url("assets/hero-space-light.jpg") center / cover no-repeat fixed;
  filter: saturate(1.08) contrast(1.05);
  transform: translateZ(0);
}
.bg-ambient::before{
  content:"";
  position:absolute; inset:0;
  background:
    radial-gradient(1200px 800px at 50% 10%, rgba(0,0,0,.28), rgba(0,0,0,.65));
  pointer-events:none;
}
.bg-ambient::after{
  content:"";
  position:absolute; inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.22'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
  opacity:.20;
  pointer-events:none;
}

/* Home-only video layer */
.bg-video-wrap{
  position:fixed;
  inset:0;
  z-index:-2;
  pointer-events:none;
  display:none; /* enabled on .page-home */
}
.page-home .bg-video-wrap{ display:block; }
.bg-video{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.55;
  filter:saturate(1.05) contrast(1.06);
}
.bg-video-vignette{
  position:absolute; inset:0;
  background:
    radial-gradient(900px 600px at 50% 30%, rgba(0,0,0,.10), rgba(0,0,0,.55)),
    linear-gradient(180deg, rgba(0,0,0,.25), rgba(0,0,0,.55));
}

/* Layout */
.container{
  width:min(var(--container), calc(100% - 40px));
  margin:0 auto;
}
.section{ padding:72px 0; }
@media (max-width: 840px){
  .section{ padding:56px 0; }
}

/* Glass utility */
.glass{
  background: linear-gradient(180deg, rgba(10,14,30,.55), rgba(10,14,30,.32));
  border:1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
}

/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  margin:14px auto 0;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:14px 16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--txt);
}
.brand-mark{
  width:34px;
  height:34px;
  border-radius:10px;
  object-fit:cover;
  border:1px solid rgba(255,255,255,.15);
  box-shadow:0 10px 24px rgba(0,0,0,.35);
}
.brand-text{
  font-family: Orbitron, Pretendard, sans-serif;
  font-weight:700;
  letter-spacing:.3px;
}
.nav{
  display:flex;
  gap:14px;
  align-items:center;
}
.nav a{
  color:rgba(234,240,255,.86);
  text-decoration:none;
  font-weight:600;
  font-size:14px;
  padding:8px 10px;
  border-radius:12px;
  transition:.18s ease;
}
.nav a:hover{
  background:rgba(70,230,255,.10);
  color:var(--txt);
}
@media (max-width: 900px){
  .nav{ display:none; }
}

/* Typography */
.eyebrow{
  margin:0 0 10px;
  font-weight:700;
  color:rgba(70,230,255,.95);
  letter-spacing:.3px;
}
h1,h2,h3{
  margin:0;
  font-family: Orbitron, Pretendard, sans-serif;
  letter-spacing:.2px;
}
.hero-title{
  margin:6px 0 14px;
  font-size:46px;
  line-height:1.12;
}
.hero-desc{
  margin:0 0 18px;
  color:var(--muted);
  font-size:16px;
  max-width:70ch;
}
@media (max-width: 840px){
  .hero-title{ font-size:34px; }
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:40px;
  padding:0 14px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.16);
  text-decoration:none;
  font-weight:800;
  letter-spacing:-.1px;
  color:var(--txt);
  background:rgba(255,255,255,.06);
  transition: .18s ease;
}
.btn:hover{ transform: translateY(-1px); background:rgba(255,255,255,.10); }
.btn-primary{
  border-color: rgba(70,230,255,.35);
  background: linear-gradient(90deg, rgba(70,230,255,.22), rgba(255,204,102,.14));
  box-shadow: 0 18px 40px rgba(70,230,255,.10);
}
.btn-primary:hover{
  box-shadow: 0 22px 60px rgba(70,230,255,.18);
}
.btn-ghost{
  background: transparent;
}
.btn-lg{
  height:48px;
  padding:0 18px;
  border-radius:16px;
  font-size:15px;
}

/* Hero */
.hero{ padding:56px 0 26px; }
.hero-inner{
  padding:26px 22px;
}
.hero-cta{ display:flex; gap:10px; flex-wrap:wrap; margin-top:16px; }
.chips{ display:flex; gap:8px; flex-wrap:wrap; margin-top:16px; }
.chip{
  display:inline-flex;
  align-items:center;
  height:30px;
  padding:0 10px;
  border-radius:999px;
  font-weight:800;
  font-size:13px;
  color:rgba(234,240,255,.9);
  border:1px solid rgba(255,255,255,.14);
  background: rgba(10,14,30,.35);
}

/* Cards / grids */
.grid-3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}
@media (max-width: 980px){
  .grid-3{ grid-template-columns:1fr; }
}
.card{ padding:18px 16px; }
.card-title{ font-size:18px; margin-bottom:8px; }
.card-desc{ margin:0; color:var(--muted); font-weight:500; }

/* Section head */
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px;
  margin-bottom:14px;
}
.section-title{
  font-size:26px;
}
.section-sub{
  margin:0;
  color:var(--muted);
  font-weight:500;
}

/* News grid (cards that can link to article.html?id=...) */
.news-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}
@media (max-width: 980px){
  .news-grid{ grid-template-columns: 1fr; }
}
.news-card{
  padding:16px;
  text-decoration:none;
  color:var(--txt);
  position:relative;
  overflow:hidden;
}
.news-card:hover{ transform: translateY(-1px); }
.news-tag{
  display:inline-flex;
  height:26px;
  align-items:center;
  padding:0 10px;
  border-radius:999px;
  border:1px solid rgba(70,230,255,.25);
  background: rgba(70,230,255,.10);
  font-weight:800;
  font-size:12px;
  color: rgba(70,230,255,.95);
}
.news-title{
  margin:10px 0 8px;
  font-family: Orbitron, Pretendard, sans-serif;
  font-size:18px;
  line-height:1.25;
}
.news-meta{
  display:flex;
  gap:10px;
  color:rgba(234,240,255,.70);
  font-weight:600;
  font-size:13px;
}
.news-excerpt{
  margin:10px 0 0;
  color:var(--muted);
}

/* Contact */
.contact{ padding:22px 18px; }

/* Footer */
.site-footer{
  padding:26px 0 42px;
  color:rgba(234,240,255,.62);
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.muted{ color:rgba(234,240,255,.62); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  .btn:hover{ transform:none; }
  .bg-video{ display:none; }
}
/* =========================================
   PATCH: Match current index.html classnames
   - universe (stars/nebula/grid/vignette)
   - home video layer (space-video)
   - missing buttons (btn-outline/btn-kakao/btn-xl)
   ========================================= */

/* Ensure header itself is glassy */
.site-header{
  background: rgba(10,14,30,.35);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: min(var(--container), calc(100% - 40px));
}

/* Universe background system used by current index.html */
.universe{
  position: fixed;
  inset: 0;
  z-index: -4;
  pointer-events: none;
  background:
    radial-gradient(1200px 900px at 55% 0%, rgba(70,230,255,.10), transparent 60%),
    radial-gradient(900px 800px at 0% 100%, rgba(255,204,102,.08), transparent 55%),
    url("assets/hero-space-light.jpg") center / cover no-repeat fixed;
  filter: saturate(1.10) contrast(1.06);
}

/* Sub-layers: subtle depth */
.universe .stars{
  position:absolute; inset:0;
  background:
    radial-gradient(2px 2px at 12% 30%, rgba(255,255,255,.75) 40%, transparent 42%),
    radial-gradient(1px 1px at 48% 65%, rgba(255,255,255,.55) 40%, transparent 42%),
    radial-gradient(1px 1px at 78% 22%, rgba(255,255,255,.45) 40%, transparent 42%),
    radial-gradient(1px 1px at 85% 78%, rgba(255,255,255,.35) 40%, transparent 42%),
    radial-gradient(1px 1px at 25% 85%, rgba(255,255,255,.35) 40%, transparent 42%);
  opacity:.55;
  animation: drift 18s linear infinite;
  transform: translateZ(0);
}

.universe .nebula{
  position:absolute; inset:-12%;
  background:
    radial-gradient(600px 420px at 30% 35%, rgba(70,230,255,.14), transparent 60%),
    radial-gradient(720px 520px at 70% 65%, rgba(255,204,102,.10), transparent 62%),
    radial-gradient(900px 680px at 50% 50%, rgba(120,140,255,.08), transparent 70%);
  filter: blur(18px);
  opacity:.85;
  animation: nebula 22s ease-in-out infinite;
}

.universe .grid{
  position:absolute; inset:0;
  background:
    linear-gradient(rgba(70,230,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(70,230,255,.06) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity:.10;
  transform: perspective(900px) rotateX(58deg) translateY(18%);
  transform-origin: bottom;
  filter: blur(.2px);
}

.universe .vignette{
  position:absolute; inset:0;
  background:
    radial-gradient(900px 600px at 50% 25%, rgba(0,0,0,.10), rgba(0,0,0,.62)),
    linear-gradient(180deg, rgba(0,0,0,.22), rgba(0,0,0,.62));
  opacity: 1;
}

/* Home-only video layer (under universe overlays, above base bg) */
.space-video{
  position: fixed;
  inset: 0;
  z-index: -5;
  pointer-events: none;
  display: none;
}
.page-home .space-video{ display:block; }
.space-video__el{
  width:100%;
  height:100%;
  object-fit: cover;
  opacity: .55;
  filter: saturate(1.05) contrast(1.06);
}

/* Hero background helper */
.hero-bg{
  position:absolute;
  inset:0;
  background: radial-gradient(900px 520px at 50% 20%, rgba(70,230,255,.14), transparent 65%);
  opacity:.9;
  pointer-events:none;
}

/* Missing button variants used in HTML */
.btn-outline{
  border-color: rgba(234,240,255,.22);
  background: rgba(10,14,30,.18);
}
.btn-outline:hover{
  background: rgba(255,255,255,.08);
}

.btn-kakao{
  border-color: rgba(255,204,102,.28);
  background: linear-gradient(90deg, rgba(255,204,102,.18), rgba(70,230,255,.12));
  box-shadow: 0 18px 44px rgba(255,204,102,.08);
}
.btn-kakao:hover{
  box-shadow: 0 22px 60px rgba(255,204,102,.14);
}

.btn-xl{
  height:56px;
  padding:0 22px;
  border-radius:18px;
  font-size:16px;
}

/* Better glass contrast for cards */
.glass{
  background: linear-gradient(180deg, rgba(10,14,30,.62), rgba(10,14,30,.34));
  border-color: rgba(170,190,255,.20);
}

/* Animations */
@keyframes drift{
  0%{ transform: translate3d(0,0,0); }
  100%{ transform: translate3d(-2%, 1.5%, 0); }
}
@keyframes nebula{
  0%,100%{ transform: translate3d(0,0,0) scale(1); }
  50%{ transform: translate3d(2.5%, -1.5%, 0) scale(1.03); }
}