/* 당근 색상 포인트를 활용한 모던 반응형 디자인 */

:root {
    --primary-color: #FF6B35;      /* 당근 색상 */
    --primary-light: #FF8659;      /* 연한 당근 색상 */
    --primary-dark: #E55A2B;       /* 진한 당근 색상 */
    --secondary-color: #4A90E2;    /* 파란색 */
    --accent-color: #2ECC71;       /* 초록색 */
    --text-primary: #2C3E50;       /* 진한 회색 */
    --text-secondary: #7F8C8D;     /* 회색 */
    --text-light: #BDC3C7;        /* 연한 회색 */
    --bg-primary: #FFFFFF;         /* 흰색 */
    --bg-secondary: #F8F9FA;       /* 연한 회색 배경 */
    --bg-card: #FFFFFF;            /* 카드 배경 */
    --border-color: #E9ECEF;       /* 테두리 색상 */
    --shadow-light: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-medium: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-strong: 0 16px 48px rgba(0,0,0,0.16);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 기본 리셋 및 타이포그래피 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 16px;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 헤더 (원래 흰색 배경 스타일) */
.header {
    background: #ffffff;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    border-bottom: 1px solid #E9ECEF;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: 8px;
}

.nav-menu a:hover,
.nav-menu a.nav-highlight {
    color: var(--primary-color);
    background-color: rgba(255, 107, 53, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 반응형 헤더 */
@media (max-width: 768px) {
    .header .container {
        padding: 0 1rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-menu.active {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 1rem;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid #E9ECEF;
    }
    
    .nav-menu.active ul {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-menu.active a {
        display: block;
        padding: 1rem;
        border-radius: 12px;
        margin-bottom: 0.5rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

@media (max-width: 480px) {
    .header .container {
        padding: 0 0.75rem;
    }
    
    .logo-text {
        font-size: 1.25rem;
    }
    
    .logo-icon {
        font-size: 1.75rem;
    }
}

/* 히어로 섹션 */
.hero {
    padding: 140px 0 100px;
    background: linear-gradient(135deg, rgba(248, 249, 250, 0.7) 0%, rgba(233, 236, 239, 0.7) 100%), url('../image/main_top.webp');
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23FF6B35" opacity="0.03"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    padding: 16px 32px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-large);
    padding: 40px;
    box-shadow: var(--shadow-strong);
    width: 100%;
    max-width: 400px;
    transform: rotate(2deg);
    transition: var(--transition);
}

.hero-card:hover {
    transform: rotate(0deg) translateY(-8px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.card-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.card-icon.math {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.card-header h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.card-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 섹션 공통 스타일 */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* 특징 섹션 */
.features {
    padding: 100px 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(248, 249, 250, 0.9));
    backdrop-filter: blur(20px);
    padding: 48px 32px;
    border-radius: 24px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.08),
        0 1px 0 rgba(255, 255, 255, 0.6) inset,
        0 -1px 0 rgba(0, 0, 0, 0.05) inset;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(145deg, 
        rgba(255, 107, 53, 0.03) 0%, 
        rgba(74, 144, 226, 0.03) 50%, 
        rgba(46, 204, 113, 0.03) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    z-index: 1;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 
        0 20px 48px rgba(0, 0, 0, 0.15),
        0 8px 24px rgba(255, 107, 53, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
    border-color: rgba(255, 107, 53, 0.2);
}

.feature-icon {
    font-size: 64px;
    margin-bottom: 32px;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    background: linear-gradient(145deg, 
        rgba(255, 107, 53, 0.1), 
        rgba(74, 144, 226, 0.1));
    border-radius: 50%;
    width: 96px;
    margin: 0 auto 32px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.06),
        0 -2px 8px rgba(255, 255, 255, 0.8) inset;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 
        0 12px 32px rgba(0, 0, 0, 0.12),
        0 -2px 8px rgba(255, 255, 255, 0.9) inset;
}

.feature-card h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
    position: relative;
    z-index: 2;
    background: linear-gradient(135deg, var(--text-primary), #34495e);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: none;
    letter-spacing: -0.01em;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 16px;
    position: relative;
    z-index: 2;
    font-weight: 500;
    opacity: 0.9;
}

/* 개별 카드 특화 디자인 */
.feature-card:nth-child(1) {
    background: linear-gradient(145deg, rgba(255, 107, 53, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(1) .feature-icon {
    background: linear-gradient(145deg, rgba(255, 107, 53, 0.15), rgba(255, 134, 89, 0.1));
    color: var(--primary-color);
}

.feature-card:nth-child(1):hover {
    border-color: rgba(255, 107, 53, 0.3);
    box-shadow: 
        0 20px 48px rgba(255, 107, 53, 0.15),
        0 8px 24px rgba(255, 107, 53, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(2) {
    background: linear-gradient(145deg, rgba(74, 144, 226, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(2) .feature-icon {
    background: linear-gradient(145deg, rgba(74, 144, 226, 0.15), rgba(91, 160, 242, 0.1));
    color: var(--secondary-color);
}

.feature-card:nth-child(2):hover {
    border-color: rgba(74, 144, 226, 0.3);
    box-shadow: 
        0 20px 48px rgba(74, 144, 226, 0.15),
        0 8px 24px rgba(74, 144, 226, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(3) {
    background: linear-gradient(145deg, rgba(46, 204, 113, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(145deg, rgba(46, 204, 113, 0.15), rgba(62, 217, 122, 0.1));
    color: var(--accent-color);
}

.feature-card:nth-child(3):hover {
    border-color: rgba(46, 204, 113, 0.3);
    box-shadow: 
        0 20px 48px rgba(46, 204, 113, 0.15),
        0 8px 24px rgba(46, 204, 113, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(4) {
    background: linear-gradient(145deg, rgba(155, 89, 182, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(4) .feature-icon {
    background: linear-gradient(145deg, rgba(155, 89, 182, 0.15), rgba(176, 111, 212, 0.1));
    color: #9B59B6;
}

.feature-card:nth-child(4):hover {
    border-color: rgba(155, 89, 182, 0.3);
    box-shadow: 
        0 20px 48px rgba(155, 89, 182, 0.15),
        0 8px 24px rgba(155, 89, 182, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(5) {
    background: linear-gradient(145deg, rgba(241, 196, 15, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(5) .feature-icon {
    background: linear-gradient(145deg, rgba(241, 196, 15, 0.15), rgba(249, 210, 60, 0.1));
    color: #F1C40F;
}

.feature-card:nth-child(5):hover {
    border-color: rgba(241, 196, 15, 0.3);
    box-shadow: 
        0 20px 48px rgba(241, 196, 15, 0.15),
        0 8px 24px rgba(241, 196, 15, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(6) {
    background: linear-gradient(145deg, rgba(231, 76, 60, 0.05), rgba(255, 255, 255, 0.95));
}

.feature-card:nth-child(6) .feature-icon {
    background: linear-gradient(145deg, rgba(231, 76, 60, 0.15), rgba(236, 112, 99, 0.1));
    color: #E74C3C;
}

.feature-card:nth-child(6):hover {
    border-color: rgba(231, 76, 60, 0.3);
    box-shadow: 
        0 20px 48px rgba(231, 76, 60, 0.15),
        0 8px 24px rgba(231, 76, 60, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

/* 학년별 섹션 */
.grade-levels {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.grade-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.grade-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-large);
    padding: 40px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.grade-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.grade-card.elementary {
    border-top: 4px solid #2ECC71;
}

.grade-card.middle {
    border-top: 4px solid var(--primary-color);
}

.grade-card.high {
    border-top: 4px solid var(--secondary-color);
}

.grade-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.grade-icon {
    font-size: 32px;
}

.grade-header h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.grade-range {
    font-size: 14px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: 12px;
    margin-left: auto;
}

.grade-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.grade-subjects span {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

/* 푸터 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 24px;
}

/* 푸터 네비게이션 */
#footer-container {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    background: white !important;
    border-top: 1px solid var(--border-color) !important;
    z-index: 9999 !important;
    width: 100% !important;
    max-width: 100% !important;
}

.footer-nav-container {
    padding: 0 !important;
    background: white !important;
    width: 100% !important;
    max-width: 100% !important;
}

.footer-banner {
    text-align: center !important;
    background-color: #FFF8F0 !important;
    padding: 5px 0 !important;
    font-weight: bold !important;
    color: #FF8A00 !important;
    border-top: 1px solid #FFE0B2 !important;
    margin: 0 !important;
    width: 100% !important;
    box-sizing: border-box !important;
    font-family: 'Pretendard', sans-serif !important;
}

.footer-nav {
    background-color: #ffffff !important;
    display: flex !important;
    justify-content: space-around !important;
    align-items: center !important;
    padding: 12px 0 !important;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1) !important;
    border-top: 1px solid rgba(0, 0, 0, 0.05) !important;
    width: 100% !important;
    margin: 0 !important;
    max-width: 100% !important;
}

.nav-item {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    text-decoration: none !important;
    color: #555 !important;
    font-size: 0.85rem !important;
    padding: 8px 0 !important;
    transition: all 0.3s ease !important;
    margin: 0 8px !important;
    text-align: center !important;
    font-family: 'Pretendard', sans-serif !important;
}

.nav-item:hover {
    color: #FF8A00 !important;
}

.nav-item.active {
    color: #FF8A00 !important;
    font-weight: bold !important;
}

.nav-item i {
    font-size: 1.4rem !important;
    margin-bottom: 6px !important;
    transition: transform 0.3s ease !important;
}

.nav-item.active i {
    transform: translateY(-4px) !important;
}

.nav-item span {
    font-size: 0.75rem !important;
    line-height: 1.2 !important;
}

/* 일주일 날짜 섹션 */
.weekly-calendar {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-top: 1px solid var(--border-color);
}

.calendar-header {
    text-align: center;
    margin-bottom: 40px;
}

.calendar-header h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.calendar-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.calendar-day {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 20px 15px;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.calendar-day::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 53, 0.1), transparent);
    transition: left 0.5s ease;
}

.calendar-day:hover::before {
    left: 100%;
}

.calendar-day:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.calendar-day.today {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.calendar-day.today:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
}

.day-name {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.calendar-day.today .day-name {
    opacity: 1;
}

.day-number {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
    display: block;
}

.day-date {
    font-size: 0.8rem;
    opacity: 0.7;
    font-weight: 500;
}

.calendar-day.today .day-date {
    opacity: 0.9;
}

/* 학습 상태 표시 */
.calendar-day.completed {
    background: linear-gradient(135deg, var(--accent-color), #27AE60);
    color: white;
    border-color: #229954;
}

.calendar-day.completed::after {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 1.2rem;
    font-weight: bold;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .weekly-calendar {
        padding: 40px 0;
    }
    
    .calendar-header h3 {
        font-size: 1.5rem;
    }
    
    .calendar-header p {
        font-size: 1rem;
    }
    
    .calendar-grid {
        gap: 10px;
    }
    
    .calendar-day {
        padding: 15px 10px;
    }
    
    .day-name {
        font-size: 0.8rem;
        margin-bottom: 5px;
    }
    
    .day-number {
        font-size: 1.4rem;
        margin-bottom: 3px;
    }
    
    .day-date {
        font-size: 0.7rem;
    }
}

@media (max-width: 480px) {
    .calendar-grid {
        gap: 8px;
    }
    
    .calendar-day {
        padding: 12px 8px;
    }
    
    .day-name {
        font-size: 0.7rem;
        margin-bottom: 3px;
    }
    
    .day-number {
        font-size: 1.2rem;
        margin-bottom: 2px;
    }
    
    .day-date {
        font-size: 0.65rem;
    }
}

/* 페이지 하단 여백 */
body {
    margin-bottom: 70px !important;
    padding-bottom: 10px !important;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 16px;
    color: var(--text-light);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 32px;
}

.link-group h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: white;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 8px;
}

.link-group a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.link-group a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 24px;
    text-align: center;
    color: var(--text-light);
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: 48px;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 24px;
    }
    
    .feature-card {
        padding: 40px 24px;
    }
    
    .feature-icon {
        width: 80px;
        height: 80px;
        font-size: 48px;
        margin-bottom: 24px;
    }
    
    .feature-card h3 {
        font-size: 22px;
        margin-bottom: 16px;
    }
    
    .grade-cards {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .hero-text p {
        font-size: 18px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .features,
    .grade-levels {
        padding: 80px 0;
    }
    
    .features-grid,
    .grade-cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-card {
        padding: 32px 20px;
        border-radius: 20px;
    }
    
    .feature-icon {
        width: 72px;
        height: 72px;
        font-size: 40px;
        margin-bottom: 20px;
    }
    
    .feature-card h3 {
        font-size: 20px;
        margin-bottom: 14px;
    }
    
    .feature-card p {
        font-size: 15px;
    }
    
    .grade-card {
        padding: 32px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-text h1 {
        font-size: 28px;
    }
    
    .hero-text p {
        font-size: 16px;
    }
    
    .hero-card {
        padding: 24px;
    }
    
    .card-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .feature-card {
        padding: 28px 16px;
        border-radius: 18px;
    }
    
    .feature-icon {
        width: 64px;
        height: 64px;
        font-size: 36px;
        margin-bottom: 18px;
    }
    
    .feature-card h3 {
        font-size: 18px;
        margin-bottom: 12px;
    }
    
    .feature-card p {
        font-size: 14px;
        line-height: 1.6;
    }
    
    .feature-card:hover {
        transform: translateY(-8px) scale(1.01);
    }
    
    .grade-card {
        padding: 24px;
    }
    
    .grade-subjects {
        justify-content: center;
    }
}@import url('subjects.css');

/* 학습 영역 섹션 */
.subjects {
    padding: 20px 0;
    background: var(--bg-primary);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.subject-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-large);
    padding: 40px;
    box-shadow: var(--shadow-light);
    border: 2px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    transition: var(--transition);
    transform: scaleX(0);
}

.subject-card.math::before {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.subject-card.multiplication::before {
    background: linear-gradient(90deg, #2ECC71, #3ED97A);
}

.subject-card.english::before {
    background: linear-gradient(90deg, #4A90E2, #5BA0F2);
}

.subject-card.clock::before {
    background: linear-gradient(90deg, #9B59B6, #B06FD4);
}

.subject-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.subject-card:hover::before {
    transform: scaleX(1);
}

.subject-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.subject-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.subject-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: left top;
    border-radius: 16px;
    filter: brightness(0.7) contrast(1.2);
}

/* 이미지로 대체되었으므로 그라데이션 배경 제거 */

/* 시계보기 아이콘 배경 제거 */

.subject-header h3 {
    font-size: 28px;
    font-weight: 700;
    color: #1a1a1a;
    flex: 1;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.subject-grade {
    font-size: 12px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
}

.subject-description {
    margin-bottom: 24px;
}

.subject-description p {
    color: #2c2c2c;
    line-height: 1.6;
    font-size: 16px;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.6);
}

.subject-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.subject-features span {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 500;
}

.subject-card.multiplication .subject-features span {
    background: rgba(46, 204, 113, 0.1);
    color: #2ECC71;
}

.subject-card.english .subject-features span {
    background: rgba(74, 144, 226, 0.1);
    color: #4A90E2;
}

.subject-card.clock .subject-features span {
    background: rgba(155, 89, 182, 0.1);
    color: #9B59B6;
}

.subject-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    background: var(--bg-secondary);
    padding: 16px 20px;
    border-radius: 12px;
    color: var(--text-primary);
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.subject-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.subject-card.multiplication .subject-link:hover {
    background: #2ECC71;
    border-color: #2ECC71;
}

.subject-card.english .subject-link:hover {
    background: #4A90E2;
    border-color: #4A90E2;
}

.subject-card.clock .subject-link:hover {
    background: #9B59B6;
    border-color: #9B59B6;
}

.link-arrow {
    font-size: 18px;
    transition: var(--transition);
}

.subject-link:hover .link-arrow {
    transform: translateX(4px);
}

/* 학년별 카드 내용 업데이트 */
.grade-content-preview {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.subject-preview {
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.4;
}

.subject-preview strong {
    color: var(--primary-color);
}

/* 카드 아이콘 업데이트 */
.card-icon.education {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

/* 캘린더 섹션 */
.calendar-section {
    padding: 20px 0;
    background: var(--bg-secondary);
}

.calendar-container {
    width: 100%;
    max-width: none;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow-light);
}

.calendar-header {
    text-align: center;
    margin-bottom: 24px;
}

.calendar-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    justify-items: center;
}

.calendar-day-header {
    text-align: center;
    padding: 8px 0;
}

.calendar-day-header p {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.calendar-day {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.calendar-day:hover {
    background: var(--primary-light);
    color: white;
}

.calendar-day.active {
    background: var(--primary-color);
    color: white;
}

.calendar-day.has-event {
    position: relative;
}

.calendar-day.has-event::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 50%;
}

.calendar-day.has-event.active::after {
    background: white;
}

/* 푸터 네비게이션 */
#footer-container {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    background: white !important;
    border-top: 1px solid var(--border-color) !important;
    z-index: 9999 !important;
    width: 100% !important;
    max-width: 100% !important;
}

.footer-nav-container {
    padding: 0 !important;
    background: white !important;
    width: 100% !important;
    max-width: 100% !important;
}

.footer-banner {
    text-align: center !important;
    background-color: #FFF8F0 !important;
    padding: 5px 0 !important;
    font-weight: bold !important;
    color: #FF8A00 !important;
    border-top: 1px solid #FFE0B2 !important;
    margin: 0 !important;
    width: 100% !important;
    box-sizing: border-box !important;
    font-family: 'Pretendard', sans-serif !important;
}

.footer-nav {
    background-color: #ffffff !important;
    display: flex !important;
    justify-content: space-around !important;
    align-items: center !important;
    padding: 12px 0 !important;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1) !important;
    border-top: 1px solid rgba(0, 0, 0, 0.05) !important;
    width: 100% !important;
    margin: 0 !important;
    max-width: 100% !important;
}

.nav-item {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    text-decoration: none !important;
    color: #555 !important;
    font-size: 0.85rem !important;
    padding: 8px 0 !important;
    transition: all 0.3s ease !important;
    margin: 0 8px !important;
    text-align: center !important;
    font-family: 'Pretendard', sans-serif !important;
}

.nav-item:hover {
    color: #FF8A00 !important;
}

.nav-item.active {
    color: #FF8A00 !important;
    font-weight: bold !important;
}

.nav-item i {
    font-size: 1.4rem !important;
    margin-bottom: 6px !important;
    transition: transform 0.3s ease !important;
}

.nav-item.active i {
    transform: translateY(-4px) !important;
}

.nav-item span {
    font-size: 0.75rem !important;
    line-height: 1.2 !important;
}

/* 일주일 날짜 섹션 */
.weekly-calendar {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-top: 1px solid var(--border-color);
}

.calendar-header {
    text-align: center;
    margin-bottom: 40px;
}

.calendar-header h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.calendar-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.calendar-day {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 20px 15px;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.calendar-day::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 53, 0.1), transparent);
    transition: left 0.5s ease;
}

.calendar-day:hover::before {
    left: 100%;
}

.calendar-day:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.calendar-day.today {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.calendar-day.today:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
}

.day-name {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.calendar-day.today .day-name {
    opacity: 1;
}

.day-number {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
    display: block;
}

.day-date {
    font-size: 0.8rem;
    opacity: 0.7;
    font-weight: 500;
}

.calendar-day.today .day-date {
    opacity: 0.9;
}

/* 학습 상태 표시 */
.calendar-day.completed {
    background: linear-gradient(135deg, var(--accent-color), #27AE60);
    color: white;
    border-color: #229954;
}

.calendar-day.completed::after {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 1.2rem;
    font-weight: bold;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .weekly-calendar {
        padding: 40px 0;
    }
    
    .calendar-header h3 {
        font-size: 1.5rem;
    }
    
    .calendar-header p {
        font-size: 1rem;
    }
    
    .calendar-grid {
        gap: 10px;
    }
    
    .calendar-day {
        padding: 15px 10px;
    }
    
    .day-name {
        font-size: 0.8rem;
        margin-bottom: 5px;
    }
    
    .day-number {
        font-size: 1.4rem;
        margin-bottom: 3px;
    }
    
    .day-date {
        font-size: 0.7rem;
    }
}

@media (max-width: 480px) {
    .calendar-grid {
        gap: 8px;
    }
    
    .calendar-day {
        padding: 12px 8px;
    }
    
    .day-name {
        font-size: 0.7rem;
        margin-bottom: 3px;
    }
    
    .day-number {
        font-size: 1.2rem;
        margin-bottom: 2px;
    }
    
    .day-date {
        font-size: 0.65rem;
    }
}

/* 페이지 하단 여백 */
body {
    margin-bottom: 70px !important;
    padding-bottom: 10px !important;
}