/* 1. 공통 변수 및 초기화 */
:root {
    --primary-color: #0071e3;
    --primary-hover: #0077ed;
    --text-color: #1d1d1f;
    --gray-text: #86868b;
    --bg-color: #ffffff;
    --secondary-bg: #f5f5f7;
    --border-color: #d2d2d7;
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro KR", "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    word-break: keep-all;
}

img, .apple-card, .choice-item {
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* 2. 헤더 */
.main-nav {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.2rem;
}

.nav-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-list li a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-list li a:hover { color: var(--primary-color); }

/* 3. 히어로 섹션 & 검색 */
.hero-wrapper {
    background: radial-gradient(circle at top right, #f5f5f7 0%, #ffffff 100%);
    padding: 80px 0 60px;
    text-align: center;
}

.badge-hero {
    display: inline-block;
    padding: 6px 16px;
    background: var(--secondary-bg);
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.hero-wrapper h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    line-height: 1.15;
}

.text-gradient {
    background: linear-gradient(90deg, #0071e3, #00b0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-wrapper p {
    font-size: 1.2rem;
    color: var(--gray-text);
    margin-bottom: 30px;
}

.search-box-wrapper {
    max-width: 650px;
    margin: 30px auto 0;
    position: relative;
    z-index: 10;
}

#mainSearch {
    width: 100%;
    padding: 20px 30px;
    padding-right: 65px;
    border-radius: 24px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    font-size: 17px;
    font-family: inherit;
    color: var(--text-color);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
    outline: none;
}

#mainSearch:focus {
    border-color: var(--primary-color);
    box-shadow: 0 15px 35px rgba(0, 113, 227, 0.12);
    transform: translateY(-2px);
}

.search-icon {
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: var(--gray-text);
    pointer-events: none;
}

/* 4. 카드 그리드 & 그룹 */
.section-padding { padding: 60px 0; }
.group-section { margin-bottom: 60px; }

.group-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.group-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-color);
}

.group-count {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-text);
    background-color: var(--secondary-bg);
    padding: 4px 14px;
    border-radius: 20px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.apple-card-link { text-decoration: none; color: inherit; display: block; }

.apple-card {
    background: var(--bg-color);
    border-radius: 22px;
    padding: 30px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.apple-card:hover {
    box-shadow: var(--card-shadow);
    transform: translateY(-5px);
    border-color: transparent;
}

.category-tag { font-size: 13px; font-weight: 600; color: var(--primary-color); margin-bottom: 8px; display: block; }
.apple-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.card-meta-list { font-size: 14px; color: var(--gray-text); }

.go-btn {
    margin-top: 20px;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-primary-apple {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 14px 28px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}
.btn-primary-apple:hover { background: var(--primary-hover); }

/* 5. 회차 리스트 */
.compact-exam-list {
    background: #ffffff;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.exam-item-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid #f2f2f7;
    transition: background 0.2s ease;
}
.exam-item-row:last-child { border-bottom: none; }
.exam-item-row:hover { background-color: #f8f8fa; }

.exam-item-info { display: flex; align-items: center; gap: 16px; flex: 1; }

.type-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 6px;
    color: white;
}
.type-badge.is-past { background: #8e8e93; }

.sess-title { font-size: 16px; font-weight: 600; color: var(--text-color); margin: 0; }

.btn-solve-pill {
    background: var(--secondary-bg);
    color: var(--text-color);
    padding: 8px 18px;
    border-radius: 40px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}
.btn-solve-pill:hover {
    background: var(--primary-color);
    color: #ffffff;
}

/* 6. 문제 풀이 레이아웃 (solve.php) */
.solve-container {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    padding-top: 25px;
    padding-bottom: 50px;
}

.solve-main { flex: 7; }
.omr-sidebar { flex: 3; position: sticky; top: 90px; }

.omr-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-top: 15px;
    max-height: 400px;
    overflow-y: auto;
}

.omr-slot {
    width: 100%;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f2f2f7;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1.5px solid transparent;
}
.omr-slot:hover { background: #e5e5ea; }
.omr-slot.marked { background: var(--primary-color); color: #fff; }
.omr-slot.current { border-color: var(--primary-color); color: var(--primary-color); background: #fff; }

.choice-item {
    display: flex;
    align-items: center;
    padding: 18px 22px;
    border: 1.5px solid #f2f2f7;
    border-radius: 18px;
    cursor: pointer;
    transition: 0.2s;
    margin-bottom: 12px;
}
.choice-item input[type="radio"] { display: none; }
.choice-item.selected { border-color: var(--primary-color) !important; background-color: #f5faff !important; }

.choice-circle {
    width: 26px; height: 26px; border-radius: 50%;
    border: 2px solid #d2d2d7; display: flex;
    align-items: center; justify-content: center;
    margin-right: 14px; font-size: 13px; font-weight: 700; color: #86868b;
}
.choice-item.selected .choice-circle { background: var(--primary-color); border-color: var(--primary-color); color: #fff; }

.btn-prev, .btn-next, .btn-submit {
    cursor: pointer;
    font-family: inherit;
}
.btn-prev {
    background: none; border: none; color: var(--gray-text);
    padding: 12px 20px; font-weight: 600; font-size: 15px; border-radius: 14px;
}
.btn-next {
    background: var(--primary-color); color: #fff;
    padding: 12px 30px; border-radius: 30px; border: none;
    font-size: 15px; font-weight: 700;
}
.btn-submit {
    background: #ff3b30; color: #fff;
    padding: 12px 30px; border-radius: 30px; border: none;
    font-size: 15px; font-weight: 700;
}

/* 7. 푸터 */
.main-footer {
    background-color: var(--secondary-bg);
    padding: 60px 0 30px;
    margin-top: 80px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-logo { font-size: 1.3rem; text-decoration: none; color: var(--text-color); font-weight: 700; margin-bottom: 15px; display: block; }
.footer-desc { color: var(--gray-text); font-size: 0.95rem; line-height: 1.6; }
.footer-links h4 { font-size: 0.9rem; margin-bottom: 18px; }
.footer-links ul { list-style: none; }
.footer-links ul li { margin-bottom: 10px; }
.footer-links ul li a { text-decoration: none; color: var(--gray-text); font-size: 0.9rem; }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: 30px; text-align: center; color: var(--gray-text); font-size: 0.85rem; }

/* 8. 반응형 */
@media (max-width: 768px) {
    .hero-wrapper h1 { font-size: 2.2rem; }
    .card-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .pc-only { display: none !important; }
    
    .solve-container { display: block; padding-top: 15px; }
    .solve-main { width: 100%; }
    .mobile-footer-fixed {
        position: fixed; bottom: 0; left: 0; right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        padding: 12px 20px;
        border-top: 1px solid var(--border-color);
        display: flex; justify-content: space-between; align-items: center;
        z-index: 2000;
    }
}
@media (min-width: 769px) {
    .mobile-only { display: none !important; }
}


/* 2. 헤더 */
.main-nav {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    position: relative;
}

.logo {
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.25rem;
    font-weight: 800;
}

.nav-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-list li a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 15px;
    font-weight: 500;
    padding: 6px 0;
    transition: color 0.2s ease;
}

.nav-list li a:hover,
.nav-list li a.active {
    color: var(--primary-color) !important;
    font-weight: 700;
}

/* 햄버거 버튼 디자인 */
.mobile-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    padding: 0;
    display: none;
    position: relative;
    justify-content: center;
    align-items: center;
}

.hamburger-icon,
.hamburger-icon::before,
.hamburger-icon::after {
    width: 22px;
    height: 2px;
    background-color: var(--text-color);
    display: block;
    position: absolute;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger-icon::before {
    content: '';
    top: -6px;
}

.hamburger-icon::after {
    content: '';
    top: 6px;
}

/* 햄버거 클릭 시 X 모양 변환 */
.mobile-menu-btn.active .hamburger-icon {
    background-color: transparent;
}
.mobile-menu-btn.active .hamburger-icon::before {
    top: 0;
    transform: rotate(45deg);
}
.mobile-menu-btn.active .hamburger-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

/* 8. 반응형 (모바일 전용 메뉴 드롭다운) */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: -5%;
        width: 110%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
        padding: 15px 0;
    }

    .nav-menu.open {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .nav-list li a {
        display: block;
        padding: 14px 25px;
        font-size: 16px;
        border-bottom: 1px solid #f2f2f7;
    }

    .nav-list li:last-child a {
        border-bottom: none;
    }

    .nav-list li a.active {
        background-color: #f5faff;
    }
}