/* ============ BASE ============ */
:root {
  --primary: #00d4ff;
  --accent: #a3e635;
  --dark: #070d1b;
  --card: #0c1428;
  --border: rgba(0, 212, 255, 0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--dark);
  font-family: 'Inter', 'Noto Sans KR', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ============ NAV ============ */
#navbar {
  background: transparent;
}
#navbar.scrolled {
  background: rgba(7, 13, 27, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.08);
}

/* ============ HERO ============ */
.hero-gradient {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0, 212, 255, 0.08) 0%, transparent 70%),
              radial-gradient(ellipse 60% 50% at 80% 80%, rgba(163, 230, 53, 0.05) 0%, transparent 60%),
              linear-gradient(to bottom, var(--dark) 0%, #040912 100%);
}

.glow-text {
  color: var(--primary);
  text-shadow: 0 0 40px rgba(0, 212, 255, 0.5), 0 0 80px rgba(0, 212, 255, 0.25);
}

/* ============ BUTTONS ============ */
.btn-primary {
  background: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
  color: #000;
  font-weight: 700;
  border: none;
  transition: all 0.3s ease;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3), 0 4px 20px rgba(0, 0, 0, 0.4);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.5), 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* ============ STATS ============ */
.stats-bg {
  background: radial-gradient(ellipse 100% 100% at 50% 0%, rgba(0, 212, 255, 0.04) 0%, transparent 60%);
}

.stat-card {
  background: linear-gradient(135deg, rgba(12, 20, 40, 0.8) 0%, rgba(7, 13, 27, 0.8) 100%);
  border: 1px solid rgba(0, 212, 255, 0.12);
  transition: border-color 0.4s ease, transform 0.4s ease, box-shadow 0.4s ease;
  backdrop-filter: blur(10px);
}
.stat-card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 212, 255, 0.08);
}

/* ============ FEATURE CARDS ============ */
.feature-card {
  background: linear-gradient(135deg, rgba(12, 20, 40, 0.6) 0%, rgba(7, 13, 27, 0.6) 100%);
  backdrop-filter: blur(10px);
  transition: all 0.4s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* ============ MARQUEE ============ */
.marquee-wrapper {
  width: 100%;
  overflow: hidden;
  position: relative;
}
.marquee-wrapper::before,
.marquee-wrapper::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 120px;
  z-index: 2;
}
.marquee-wrapper::before {
  left: 0;
  background: linear-gradient(to right, var(--dark), transparent);
}
.marquee-wrapper::after {
  right: 0;
  background: linear-gradient(to left, var(--dark), transparent);
}

.marquee-track {
  display: flex;
  animation: marquee-ltr 30s linear infinite;
}
.marquee-track-reverse {
  display: flex;
  animation: marquee-rtl 25s linear infinite;
}
.marquee-track-slow {
  display: flex;
  animation: marquee-ltr 40s linear infinite;
}

.marquee-content {
  display: flex;
  gap: 12px;
  padding-right: 12px;
  flex-shrink: 0;
}

@keyframes marquee-ltr {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@keyframes marquee-rtl {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

.marquee-wrapper:hover .marquee-track,
.marquee-wrapper:hover .marquee-track-reverse,
.marquee-wrapper:hover .marquee-track-slow {
  animation-play-state: paused;
}

.logo-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(12, 20, 40, 0.7);
  white-space: nowrap;
  font-size: 12px;
  font-weight: 600;
  color: #94a3b8;
  letter-spacing: 0.02em;
  transition: all 0.3s ease;
  cursor: default;
  backdrop-filter: blur(10px);
}
.logo-chip:hover {
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--primary);
  background: rgba(0, 212, 255, 0.05);
}
.logo-chip .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============ FORM ============ */
.form-bg {
  background: radial-gradient(ellipse 80% 80% at 50% 50%, rgba(0, 212, 255, 0.04) 0%, transparent 70%);
}

.form-card {
  background: linear-gradient(135deg, rgba(12, 20, 40, 0.9) 0%, rgba(7, 13, 27, 0.9) 100%);
  backdrop-filter: blur(20px);
}

.form-input {
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.3s ease;
}
.form-input:focus {
  background: rgba(0, 212, 255, 0.04);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

/* ============ FADE IN ANIMATIONS ============ */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ CANVAS ============ */
#networkCanvas {
  opacity: 0.6;
}

/* ============ PROGRAM CARDS ============ */
.program-card {
  background: linear-gradient(135deg, rgba(12, 20, 40, 0.7) 0%, rgba(7, 13, 27, 0.7) 100%);
  backdrop-filter: blur(10px);
  transition: all 0.4s ease;
}
.program-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.tag-chip {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: rgba(0, 212, 255, 0.8);
}
.tag-chip-accent {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(163, 230, 53, 0.08);
  border: 1px solid rgba(163, 230, 53, 0.2);
  color: rgba(163, 230, 53, 0.8);
}

/* ============ TIMETABLE ============ */
.timetable-card {
  transition: all 0.3s ease;
}
.timeline-dot {
  width: 20px;
  margin-left: -2px;
}

.badge-primary {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--primary);
  letter-spacing: 0.03em;
}
.badge-accent {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 100px;
  background: rgba(163, 230, 53, 0.12);
  border: 1px solid rgba(163, 230, 53, 0.3);
  color: var(--accent);
  letter-spacing: 0.03em;
}
.badge-neutral {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 100px;
  background: rgba(100, 116, 139, 0.15);
  border: 1px solid rgba(100, 116, 139, 0.3);
  color: #94a3b8;
  letter-spacing: 0.03em;
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: rgba(0, 212, 255, 0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 212, 255, 0.5); }

/* ============ SELECTION ============ */
::selection { background: rgba(0, 212, 255, 0.25); color: #fff; }