/* -------------------------------------------- */ 
/* Reset & Variables                           */
/* -------------------------------------------- */
:root {
  --clr-bg: #0d0f14;
  --clr-text: #e0e0e0;
  --clr-primary: #00c9ff;
  --clr-secondary: #92fe9d;
  --font-sans: 'Inter', sans-serif;
}

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

body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-sans);
  line-height: 1.5;
  /* 헤더 높이에 맞춰 본문 아래로 여백 추가 (실제 높이 확인 후 조정) */
  padding-top: 60px;
}

/* -------------------------------------------- */
/* Utility Classes                             */
/* -------------------------------------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

a {
  color: inherit;
  text-decoration: none;
}

/* -------------------------------------------- */
/* Header & Navigation                         */
/* -------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(20, 20, 20, 0.95);
  backdrop-filter: blur(6px);
  z-index: 1000;
}

.header__inner {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
}

/* 햄버거 토글 버튼 */
.nav-toggle {
  display: block;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  margin-right: 0.75rem;
  color: var(--clr-text);
}

.nav-toggle__icon {
  display: inline-block;
  transition: transform 0.3s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  transform: rotate(90deg);
}

/* 로고 */
.logo {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--clr-text);
}

/* 네비게이션 (토글용) */
.nav {
  display: none;
  position: absolute;
  top: 100%;
  right: 1rem;
  background: rgba(20, 20, 20, 0.95);
  backdrop-filter: blur(6px);
  border-radius: 0.5rem;
  z-index: 999;
}

.nav.open {
  display: block;
}

.nav__list {
  list-style: none;
  padding: 1rem;
}

.nav__list li + li {
  margin-top: 0.5rem;
}

.nav__list a {
  color: var(--clr-text);
  font-weight: 500;
  display: block;
}

/* Desktop Nav (≥768px) */
@media (min-width: 768px) {
  /* 햄버거 아이콘은 항상 보이되, 클릭 시 토글 */
  .nav {
    position: static;
    display: none;
    background: none;
    backdrop-filter: none;
    border-radius: 0;
    margin-left: auto;
  }

  .nav.open {
    display: flex;
  }

  .nav__list {
    display: flex;
    gap: 1.5rem;
    padding: 0;
  }

  .nav__list li + li {
    margin-top: 0;
  }
}

/* -------------------------------------------- */
/* Hero Section                                 */
/* -------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-size: 3rem;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  margin: 1rem 0 2rem;
  font-size: 1.25rem;
}

.btn-primary {
  display: inline-block;
  padding: .75rem 2rem;
  border-radius: 999px;
  background: var(--clr-primary);
  color: #000;
  font-weight: 600;
  transition: transform .3s, box-shadow .3s;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(0, 201, 255, 0.4);
}

.hero__bg {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 150%;
  height: 150%;
  background: radial-gradient(circle at center, var(--clr-primary), transparent 70%);
  transform: translate(-50%, -50%) scale(1);
  animation: pulse 8s infinite;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50%      { transform: translate(-50%, -50%) scale(1.2); }
}

/* -------------------------------------------- */
/* Glassmorphism Card                           */
/* -------------------------------------------- */
.card.glass {
  background: rgba(13,15,20,0.3);
  backdrop-filter: blur(10px);
  border-radius: 1rem;
  padding: 2rem;
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}

.card.glass:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.card h3 {
  margin-bottom: .75rem;
  font-size: 1.25rem;
  color: var(--clr-secondary);
}

/* -------------------------------------------- */
/* Footer                                       */
/* -------------------------------------------- */
.footer {
  padding: 2rem 0;
  text-align: center;
  background: #090a0d;
}

/* Optional: 스크롤바, 링크 등 추가 스타일 */
/* … 필요에 따라 이어서 작성 … */