:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #2c3e50;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding-top: 76px;
    color: #333;
}

.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
                url('https://via.placeholder.com/1920x1080') center/cover;
    height: 100vh;
    display: flex;
    align-items: center;
    color: white;
}

/* 섹션 제목 */
.section-title {
    position: relative;
    margin-bottom: 2.5rem;
    padding-bottom: 1rem;
    color: #333;
    font-weight: 700;
    font-size: 2.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, #3a7bd5, #00d2ff);
    bottom: 0;
    left: 0;
    transform: none;
    border-radius: 2px;
}

/* text-start 클래스가 있는 경우 추가 스타일 */
.section-title.text-start::after {
    left: 0;
    transform: none;
}

.feature-card {
    border: none;
    border-radius: 10px;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
}

.tech-specs {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    width: 100%;
    aspect-ratio: 16 / 9;
    height: 0;
    padding-top: 56.25%;
    background: #eee;
}

.gallery-item img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--secondary-color);
}

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: #3a7bd5;
    color: white;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(58, 123, 213, 0.3);
}

.back-to-top:hover {
    background-color: #00d2ff;
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 210, 255, 0.4);
}

/* 비디오 배너용 스타일 - 기존 코드 아래에 추가 */
.hero-section.position-relative {
    background: none !important; /* 비디오 섹션의 어두운 오버레이 제거 */
}

/* 비디오 배너 오버레이 투명하게 */
.hero-section .position-relative::before {
    background: rgba(0, 0, 0, 0) !important;
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* Hero Section 버튼 스타일 */
.hero-section .btn {
    font-size: 1.15rem;
    font-weight: 600;
    border-radius: 2.5rem;
    padding: 0.9rem 2.4rem;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    letter-spacing: 0.01em;
    background: rgba(255,255,255,0.22);
    color: #222;
    box-shadow: 0 4px 24px rgba(44,62,80,0.08), 0 1.5px 8px rgba(80,120,255,0.08);
    backdrop-filter: blur(12px);
    border: 1.5px solid rgba(255,255,255,0.25);
    transition: all 0.22s cubic-bezier(.4,0,.2,1);
    position: relative;
    overflow: hidden;
}

.hero-section .btn i {
    font-size: 1.2em;
    margin-right: 0.5em;
}

.hero-section .btn-primary,
.hero-section .btn-success,
.hero-section .btn-outline-info {
    background: rgba(255,255,255,0.22);
    color: #222;
    border: 1.5px solid rgba(255,255,255,0.25);
    box-shadow: 0 4px 24px rgba(44,62,80,0.08), 0 1.5px 8px rgba(80,120,255,0.08);
}
.hero-section .btn-primary:hover, .hero-section .btn-primary:focus {
    background: linear-gradient(90deg, #3a7bd5 0%, #00d2ff 100%);
    color: #fff;
    border: none;
    transform: translateY(-2px) scale(1.045);
    box-shadow: 0 0 0 4px rgba(79,140,255,0.10), 0 8px 32px rgba(79,140,255,0.22);
}

.hero-section .btn-success:hover, .hero-section .btn-success:focus {
    background: linear-gradient(90deg, #11998e 0%, #38ef7d 100%);
    color: #fff;
    border: none;
    transform: translateY(-2px) scale(1.045);
    box-shadow: 0 0 0 4px rgba(67,233,123,0.10), 0 8px 32px rgba(67,233,123,0.22);
}

.hero-section .btn-outline-info:hover, .hero-section .btn-outline-info:focus {
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    transform: translateY(-2px) scale(1.045);
    box-shadow: 0 0 0 4px rgba(161,140,209,0.10), 0 8px 32px rgba(161,140,209,0.22);
}

.hero-section .btn:active {
    transform: scale(0.98);
}

@media (max-width: 992px) {
  .hero-section .btn {
    font-size: 1rem;
    padding: 0.7rem 1.5rem;
    border-radius: 2rem;
    gap: 0.4rem;
  }
}

@media (max-width: 576px) {
  .hero-section .btn {
    font-size: 0.95rem;
    padding: 0.55rem 1.1rem;
    border-radius: 1.5rem;
    gap: 0.3rem;
  }
}