/* ================================================================
   [1] 변수 및 기본 설정 (Variables & Reset)
   ================================================================ */
:root {
    --indigo-main: #1e1b4b;
    --indigo-light: #4f46e5;
    --pyon-main: #348fce;
    --pyon-sub: #2a7bb5;
    --pyon-yellow: #FFD400;
    --pyon-pink: #ff69b4;
    --success-green: #10b981;
    --pc-sidebar-width: 340px;
    --header-height: 72px;
}

body {
    background-color: #ffffff;
    padding-top: var(--header-height); /* 헤더 고정 높이 대응 */
    font-family: 'Pretendard', sans-serif;
    margin: 0;
}

/* ================================================================
   [2] 헤더 & 네비게이션 (Header & Nav)
   ================================================================ */
.main-header {
    background: rgba(30, 27, 75, 0.95) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.7rem 0;
    z-index: 1080;
}

.main-header .nav-link {
    color: rgba(255, 255, 255, 0.8) !important;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 1.2rem !important;
    transition: 0.2s;
}

.main-header .nav-link:hover {
    color: var(--pyon-yellow) !important;
}

/* 드롭다운 메뉴 */
.main-header .dropdown-menu {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    padding: 10px;
    margin-top: 15px !important;
}

.main-header .dropdown-item {
    border-radius: 8px;
    padding: 10px 15px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.main-header .dropdown-item:hover {
    background-color: #f8f9fa;
    color: var(--indigo-light) !important;
    transform: translateX(5px);
}

/* ================================================================
   [3] 히어로 섹션 (Hero Section)
   ================================================================ */
.hero-gradient-fixed {
    background: linear-gradient(135deg, var(--indigo-main) 0%, var(--indigo-light) 100%) !important;
    padding: 3.5rem 0;
    border-bottom-left-radius: 2.5rem;
    border-bottom-right-radius: 2.5rem;
    color: white;
    margin-top: 0 !important;
}

/* ================================================================
   [4] 퀴즈 카드 디자인 (Quiz Cards)
   ================================================================ */
.quiz-card-premium {
    position: relative;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 1.5rem;
    background: #fff;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.quiz-card-premium:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.mission-tag {
    position: absolute;
    top: -1px;
    left: 20px;
    background: var(--indigo-light);
    color: white;
    padding: 6px 14px;
    font-weight: 800;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    z-index: 10;
}

.quiz-card-premium.done .mission-tag { background: var(--success-green); }
.quiz-card-premium:hover .mission-tag { background: var(--pyon-yellow); color: var(--indigo-main); }

/* ================================================================
   [5] 반응형 레이아웃 (Responsive)
   ================================================================ */
@media (max-width: 991.98px) {
    /* 모바일 헤더 메뉴 */
    .navbar-collapse {
        background: var(--indigo-main);
        margin-top: 1rem;
        padding: 1.5rem;
        border-radius: 1.5rem;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .navbar-toggler-icon {
        filter: invert(1); /* 햄버거 버튼 화이트 처리 */
    }

    /* 사이드바 카드 풀사이즈 */
    .demo-card, .ranking-card, .smart-ad {
        width: 100% !important;
        margin: 0 0 20px 0;
    }
}