/* ========================================
   🧭 네비게이션 스타일
   ======================================== */

/* 네비게이션을 위한 body 패딩 */
body {
    padding-top: 80px; /* 네비게이션 높이만큼 여백 */
}

/* 네비게이션 바 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(101, 175, 255, 0.2);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* 브랜드 로고 */
.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-logo {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 10px rgba(101, 175, 255, 0.3));
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-headline);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 네비게이션 메뉴 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-cta);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* 모바일 메뉴 토글 버튼 */
.nav-tools {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 3px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle:hover {
    background: rgba(101, 175, 255, 0.1);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
    border-radius: 1px;
}

/* 모바일 메뉴 활성화 상태 */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========================================
   📱 모바일 반응형
   ======================================== */

@media (max-width: 768px) {
    .navbar .container {
        padding: 1rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 2rem;
        border-top: 1px solid rgba(101, 175, 255, 0.2);
        transition: left 0.3s ease;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-link {
        display: block;
        width: 100%;
        padding: 1rem 0;
        font-size: 1.1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-link::after {
        bottom: 0;
        height: 1px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        padding: 0.75rem;
    }
    
    .nav-title {
        font-size: 1.1rem;
    }
    
    .nav-logo {
        font-size: 1.3rem;
    }
}

/* ========================================
   🎯 스크롤 효과
   ======================================== */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-cta);
    z-index: 1001;
    transition: width 0.1s ease;
}