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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
    line-height: 1.6;
    color: #333;
}

.container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 30px;
}

/* Header */
.header {
    background: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    position: relative;
}

.logo-image {
    height: 80px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo-image:hover {
    transform: scale(1.05);
}

.auth-links {
    display: flex;
    gap: 20px;
    position: absolute;
    right: 0;
}

.auth-links a {
    color: #888;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
    padding: 5px 10px;
    border-radius: 5px;
}

.auth-links a:hover {
    color: #cd0e00;
    background: #f8f9fa;
}

/* 햄버거 메뉴 버튼 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 10px;
    position: absolute;
    right: 0;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Navigation */
.nav {
    background: transparent;
    padding: 15px 0;
}

.nav .container {
    background: #f5f5f5;
    border-radius: 50px;
    padding: 0 30px;
    max-width: 1440px;
}

.nav .close-btn {
    display: none;
}

.nav-menu {
    display: flex;
    justify-content: center;
    gap: 60px;
    list-style: none;
    padding: 15px 0;
}

.nav-item {
    position: relative;
}

.nav-menu a {
    color: #111;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: all 0.3s ease;
    padding: 10px 15px;
    border-radius: 25px;
    position: relative;
    display: block;
}

.nav-menu > .nav-item > a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* 서브메뉴 스타일 */
.sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border-radius: 8px;
    padding: 8px 0;
    min-width: 140px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    list-style: none;
    margin-top: 5px;
    border: 1px solid #e9ecef;
}

.nav-item:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.sub-menu li {
    margin: 0;
}

.sub-menu a {
    color: #555 !important;
    font-size: 14px !important;
    font-weight: 400 !important;
    padding: 10px 16px !important;
    border-radius: 0 !important;
    transition: all 0.2s ease !important;
    display: block;
    border-bottom: 1px solid #f1f3f4;
}

.sub-menu li:last-child a {
    border-bottom: none;
}

.sub-menu a:hover {
    background: #f8f9fa !important;
    color: #333 !important;
    transform: none !important;
}

/* 서브페이지 전용 스타일 */
.sub-banner {
    height: 240px;
    background-image: url('./image/sub-topbanner.png');
    background-color: #111;
    border-radius: 40px;
    margin: 20px 0 70px;
    position: relative;
    overflow: visible;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.sub-banner-content {
    text-align: center;
    color: white;
    position: relative;
    z-index: 2;
}

.sub-banner-title {
    padding-top: 50px;
    font-size: 48px;
    font-weight: bold;
    margin: 0;
    color: white;
    letter-spacing: -0.5px;
    text-shadow: 0 0px 8px rgba(0, 0, 0, 0.382);
}

/* 탭 메뉴를 배너 안으로 이동 */
.sub-banner .tab-menu {
    top: 23%;
    display: flex;
    background: white;
    border-radius: 40px;
    padding: 0;
    margin: 0;
    width: 500px;
    height: 60px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 0px 8px rgba(0, 0, 0, 0.123);
}

.sub-banner .tab-item {
    flex: 1;
    text-align: center;
    padding: 0;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 40px;
    background: transparent;
    border: none;
    color: #666;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.sub-banner .tab-item.active {
    background: #d63031;
    color: white;
    transform: none;
}

.sub-banner .tab-item:not(.active) {
    background: transparent;
    color: #666;
}

.sub-banner .tab-item:not(.active):hover {
    color: #333;
}

/* 학원소개 콘텐츠 스타일 */
.intro-content {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 30px;
}

/* 메인 소개 섹션 */
.main-intro-section {
    border-radius: 30px;
    padding: 80px 60px;
    margin-bottom: 80px;
    color: rgb(0, 0, 0);
    position: relative;
    overflow: hidden;
}

.main-intro-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 1;
}

.main-intro-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    z-index: 1;
}

.main-intro-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.main-intro-title {
    font-size: 50px;
    font-weight: bold;
    margin-bottom: 50px;
    line-height: 1.2;
}

.main-intro-subtitle {
    font-size: 24px;
    margin-bottom: 20px;
    font-weight: bold;
    opacity: 0.9;
}

.main-intro-text {
    font-size: 22px;
    line-height: 1.8;
    margin-bottom: 50px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.contact-item {
    text-align: center;
}

.contact-label {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 5px;
}

.contact-value {
    font-size: 20px;
    font-weight: bold;
}

/* 4가지 특징 섹션 */
.features-section {
    margin-bottom: 80px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.feature-item {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #d63031, #b21818);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-number {
    font-size: 48px;
    font-weight: bold;
    color: #d63031;
    margin-bottom: 20px;
    line-height: 1;
}

.feature-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #333;
}

.feature-description {
    font-size: 16px;
    line-height: 1.6;
    color: #666;
    margin-bottom: 20px;
}

.feature-details {
    font-size: 14px;
    line-height: 1.5;
    color: #888;
}

/* MKTI 교재 라인업 섹션 */
.mkti-section {
    border-radius: 30px;
    padding: 80px 60px;
    margin-bottom: 40px;
}

.mkti-header {
    text-align: center;
    margin-bottom: 60px;
}

.mkti-title {
    font-size: 46px;
    line-height: 1.3;
    font-weight: bold;
    margin-bottom: 50px;
    color: #333;
}

.mkti-subtitle {
    font-size: 20px;
    color: #666;
    margin-bottom: 40px;
}

.mkti-highlight {
    font-size: 24px;
    font-weight: bold;
    color: #d63031;
    margin-bottom: 30px;
}

.mkti-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.mkti-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.mkti-card:hover {
    transform: translateY(-5px);
    border-color: #d63031;
    box-shadow: 0 10px 30px rgba(45, 111, 101, 0.1);
}

.mkti-card-title {
    font-size: 24px;
    font-weight: bold;
    color: white;
    background: #d63031;
    padding: 8px 40px;
    border-radius: 50px;
    margin-bottom: 20px;
    display: inline-block;
}

.mkti-card-content {
    font-size: 20px;
    line-height: 1.6;
    color: #666;
}


/* 논술 커리큘럼 섹션 */
.curriculum-section {
    background: #f5f5f5;
    border-radius: 30px;
    padding: 80px 60px;
    margin-bottom: 80px;

}

.curriculum-title {
    text-align: center;
    font-size: 46px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #000000;
}

.curriculum-subtitle {
    text-align: center;
    font-size: 20px;
    color: #666;
    margin-bottom: 40px;
}

.curriculum-table {
    width: 100%;
    border-collapse: collapse;
}

.curriculum-table th {
    background: #3f3f3f;
    border-right: 2px solid #f5f5f5;
    color: white;
    padding: 20px;
    font-size: 18px;
    text-align: center;
    font-weight: bold;
}

.curriculum-table td {
    background: #ffffff;
    border-right: 2px solid #f5f5f5;
    padding: 18px;
    text-align: center;
    border-bottom: 2px solid #f5f5f5;
    font-size: 18px;
    line-height: 1.6;
}

.curriculum-table tr:last-child td {
    border-bottom: none;
}


.curriculum-table tr:nth-child(even) {
    background: #f8fffe;
    
}

.info-section {
    text-align: center; 
    margin-bottom: 80px; 
    background: url("./image/info_banner.png");
    background-color: rgb(0, 0, 0);
    color: white; 
    padding: 60px; 
    border-radius: 30px;
}

.info-section h2 {
    font-size: 36px; 
    margin-bottom: 10px;
    text-shadow: 0 0 10px #00000035;
}

.info-section h1 {
    font-size: 48px; 
    line-height: 1;
    font-weight: bold; 
    margin-bottom: 40px;
    text-shadow: 0 0 10px #00000035;
}

.info-section-text p {
    font-size: 22px; 
    font-weight: bold; 
    margin-bottom: 30px;
    text-shadow: 0 0 10px #00000035;
}

.info-section-text span {
    font-size: 18px; 
    font-weight: normal; 
    margin-bottom: 30px;
    text-shadow: 0 0 10px #00000035;
}


/* Footer */
.footer {
    background: #4a4a4a;
    color: #999;
    padding: 30px 0 40px;
    margin-top: 80px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #666;
}

.footer-left {
    flex: 1;
}

.footer-nav {
    display: flex;
    gap: 40px;
    align-items: center;
}

.footer-nav-link {
    color: #ccc;
    text-decoration: none;
    font-size: 16px;
    font-weight: 400;
    transition: color 0.3s ease;
}

.footer-nav-link:hover {
    color: white;
}

.footer-right {
    flex-shrink: 0;
}

.footer-social {
    display: flex;
    gap: 15px;
    align-items: center;
}

.footer-social-link {
    width: 32px;
    height: 32px;
    display: block;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    transition: opacity 0.3s ease;
    border-radius: 4px;
}

.footer-social-link:hover {
    opacity: 0.7;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.footer-info {
    color: #999;
    font-size: 14px;
    line-height: 1.6;
}

.footer-info-row {
    margin-bottom: 8px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.footer-info-row span {
    white-space: nowrap;
}

.divider {
    color: #666;
    margin: 0 4px;
}

.footer-copyright {
    margin-top: 15px;
    color: #777;
    font-size: 13px;
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .intro-content {
        padding: 0 20px;
    }

    .main-intro-section {
        padding: 60px 40px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .mkti-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .achievement-stats {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .intro-content {
        padding: 0 15px;
    }

    /* Header 모바일 */
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .logo {
        flex: 0;
        margin-right: auto;
    }

    .logo-image {
        height: 60px;
    }

    .auth-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    /* Navigation 모바일 */
    .nav {
        position: fixed;
        top: 0;
        right: -350px;
        width: 350px;
        height: 100vh;
        background: white;
        z-index: 1000;
        transition: right 0.3s ease;
        padding: 0;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav.active {
        right: 0;
    }

    .nav .container {
        background: white;
        border-radius: 0;
        padding: 80px 20px 20px;
        width: 100%;
        height: 100vh;
        margin: 0;
        position: relative;
        box-shadow: none;
    }

    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

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

    .nav-item {
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-menu > .nav-item > a {
        padding: 20px 0;
        font-size: 18px;
        color: #333;
        border-radius: 0;
        border-bottom: 1px solid #f0f0f0;
        position: relative;
    }

    .nav-menu > .nav-item > a:hover {
        background: #f8f9fa;
        transform: none;
    }

    .nav-item.has-submenu > a::after {
        content: '▶';
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        font-size: 12px;
        transition: transform 0.3s ease;
    }

    .nav-item.has-submenu.active > a::after {
        transform: translateY(-50%) rotate(90deg);
    }

    .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: #f8f9fa;
        box-shadow: none;
        border: none;
        border-radius: 0;
        margin-top: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-item.active .sub-menu {
        max-height: 200px;
    }

    .sub-menu a {
        padding: 15px 20px !important;
        font-size: 16px !important;
        color: #666 !important;
        border-bottom: 1px solid #e0e0e0 !important;
        margin-left: 20px !important;
    }

    .sub-menu a:hover {
        background: #f0f0f0 !important;
        color: #333 !important;
    }

    .nav .close-btn {
        position: absolute;
        top: 20px;
        right: 20px;
        background: none;
        border: none;
        font-size: 24px;
        color: #333;
        cursor: pointer;
        padding: 10px;
        display: block;
    }

    /* 서브배너 모바일 */
    .sub-banner {
        height: 200px;
        border-radius: 20px;
        margin: 15px 0 40px;
    }

    .sub-banner-title {
        font-size: 28px;
        padding-top: 30px;
    }

    .sub-banner .tab-menu {
        width: 280px;
        height: 50px;
    }

    .sub-banner .tab-item {
        font-size: 14px;
    }

    /* 콘텐츠 모바일 */
    .main-intro-section {
        padding: 40px 20px;
    }

    .main-intro-title {
        font-size: 28px;
    }

    .main-intro-subtitle {
        font-size: 18px;
    }

    .main-intro-text {
        font-size: 16px;
    }

    .contact-info {
        flex-direction: column;
        gap: 20px;
    }

    .features-title {
        font-size: 28px;
    }

    .mkti-section {
        padding: 40px 20px;
    }

    .mkti-grid {
        grid-template-columns: 1fr;
    }

    .achievement-stats {
        flex-direction: column;
        gap: 30px;
    }

    .stat-number {
        font-size: 36px;
    }

    .curriculum-section {
        padding: 40px 20px;
    }

    .curriculum-table {
        font-size: 12px;
    }

    .curriculum-table th,
    .curriculum-table td {
        padding: 15px 10px;
    }

    /* Footer 모바일 */
    .footer {
        padding: 40px 0 30px;
        margin-top: 60px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .footer-nav {
        flex-wrap: wrap;
        gap: 15px;
        justify-content: center;
    }

    .footer-nav-link {
        font-size: 14px;
    }

    .footer-social {
        gap: 12px;
    }

    .footer-social-link {
        width: 28px;
        height: 28px;
    }

    .footer-info {
        font-size: 12px;
        text-align: center;
    }

    .footer-info-row {
        flex-direction: column;
        gap: 4px;
        text-align: center;
    }

    .divider {
        display: none;
    }
}

/* 로딩 애니메이션 */
.loading {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* 스크롤 애니메이션 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}