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

/* 변수 설정 */
:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #f59e0b;
    --text-color: #111827;
    --bg-color: #ffffff;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* 기본 스타일 */
body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 헤더 스타일 */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--gray-100);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
}

.logo {
    color: var(--primary-color);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    text-decoration: none;
    transition: color 0.2s ease;
}

.logo:hover {
    color: var(--primary-dark);
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
}

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

/* 버튼 스타일 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    position: relative;
    isolation: isolate;
    background-color: white;
    will-change: transform;
    transform: translateY(0);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
    color: var(--primary-color);
    box-shadow: var(--shadow);
    font-size: 1.125rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background-color: var(--gray-100);
    color: var(--primary-dark);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
}

.btn-support {
    background-color: var(--secondary-color);
    color: white;
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
}

.btn-support:hover {
    background-color: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-support:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
}

.support-btn {
    background-color: var(--secondary-color);
    color: white !important;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    will-change: transform;
    transform: translateY(0);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    box-shadow: var(--shadow);
}

.support-btn::after {
    display: none; /* 밑줄 효과 제거 */
}

.support-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background-color: #f97316 !important;
    color: white !important;
}

.support-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
}

/* 히어로 섹션 */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    padding: 5rem 0;
    text-align: 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 width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    font-weight: 400;
}

/* 기능 소개 섹션 */
.features {
    padding: 4rem 0;
    background-color: var(--gray-100);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-card {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.feature-card p {
    color: #4b5563;
    font-size: 1.125rem;
}

/* 후원 섹션 */
.support {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    padding: 4rem 0;
    text-align: center;
    position: relative;
}

.support h3 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: #92400e;
}

.support p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: #92400e;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 푸터 */
.footer {
    background-color: var(--text-color);
    padding: 2rem 0;
    color: white;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    font-size: 0.875rem;
    opacity: 0.8;
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-link {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.footer-link:hover {
    opacity: 1;
}

/* 반응형 디자인 */
/* @media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }

    .hero {
        padding: 4rem 0;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .features {
        padding: 3rem 0;
    }

    .support {
        padding: 3rem 0;
    }

    .feature-grid {
        gap: 1rem;
        padding: 0 0.5rem;
    }

    .support h3 {
        font-size: 2rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-nav {
        justify-content: center;
        gap: 1rem;
    }
} */

/* 모바일 메뉴 버튼 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
}

/* 모바일 메뉴 오버레이 */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 98;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .header .container {
        padding: 1rem 1.5rem;
    }

    .mobile-menu-btn {
        display: block;
        z-index: 101;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: white;
        padding: 80px 20px 20px;
        transition: right 0.3s ease;
        box-shadow: -2px 0 5px rgba(0, 0, 0, 0.1);
        display: flex;
        flex-direction: column;
        gap: 0;
        z-index: 99;
    }

    .nav.active {
        right: 0;
    }

    .nav-link {
        padding: 15px 0;
        border-bottom: 1px solid var(--gray-200);
        width: 100%;
        font-size: 1.1rem;
    }

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

    .support-btn {
        margin-top: 1rem;
        text-align: center;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .features {
        padding: 3rem 0;
    }

    .support {
        padding: 3rem 0;
    }

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

    .support h3 {
        font-size: 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-nav {
        justify-content: center;
        margin-top: 1rem;
    }
}