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

:root {
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    --secondary-color: #0EA5E9;
    --accent-color: #8B5CF6;
    --text-dark: #1E293B;
    --text-gray: #64748B;
    --text-light: #94A3B8;
    --bg-light: #F8FAFC;
    --bg-card: #FFFFFF;
    --white: #FFFFFF;
    --border-color: #E2E8F0;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #6366F1 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    overflow-x: hidden;
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 헤더 */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 24px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-gray);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    background: var(--gradient-primary);
    color: var(--white) !important;
    padding: 10px 24px;
    border-radius: 100px;
    font-weight: 600;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* 버튼 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.15);
    color: var(--white);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* 히어로 섹션 */
.hero {
    padding: 160px 0 100px;
    background: var(--gradient-hero);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    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"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></svg>');
    background-size: 100px 100px;
    opacity: 0.5;
}

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

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    position: relative;
    z-index: 2;
}

.app-screenshot {
    max-width: 100%;
    height: auto;
    max-height: 600px;
    border-radius: 32px;
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
}

.floating-card {
    position: absolute;
    background: var(--white);
    padding: 12px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    animation: float 3s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: -40px;
    animation-delay: 0s;
}

.card-2 {
    bottom: 25%;
    right: -30px;
    animation-delay: 1.5s;
}

.floating-icon {
    font-size: 1.25rem;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* 섹션 공통 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    color: var(--primary-color);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.badge-ai {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
    color: #8B5CF6;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.section-title.left-align {
    text-align: left;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* 기능 섹션 */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon-wrapper {
    margin-bottom: 1.25rem;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    color: var(--text-gray);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* AI 섹션 */
.ai-section {
    background: linear-gradient(180deg, #1E1B4B 0%, #312E81 100%);
    color: var(--white);
    overflow: hidden;
}

.ai-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.ai-text .section-title {
    color: var(--white);
}

.ai-desc {
    font-size: 1.1rem;
    opacity: 0.85;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.ai-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ai-feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.ai-feature:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(8px);
}

.ai-feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3) 0%, rgba(236, 72, 153, 0.3) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-feature-text h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.ai-feature-text p {
    font-size: 0.9rem;
    opacity: 0.75;
}

.ai-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.ai-mockup img {
    max-width: 100%;
    max-height: 500px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
}

.ai-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
    z-index: 0;
    filter: blur(60px);
}

/* 조직 관리 */
.organization {
    background: var(--white);
}

.org-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.org-card {
    background: var(--bg-light);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    border: 2px solid transparent;
    transition: var(--transition);
}

.org-card:hover {
    box-shadow: var(--shadow-lg);
}

.org-card.manager {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);
}

.org-card.teacher {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.03) 0%, rgba(6, 182, 212, 0.03) 100%);
}

.org-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.org-icon {
    width: 56px;
    height: 56px;
    background: var(--white);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.manager .org-icon {
    color: var(--primary-color);
}

.teacher .org-icon {
    color: var(--secondary-color);
}

.org-card-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    flex: 1;
}

.org-badge {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
}

.org-badge.badge-teacher {
    background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
}

.org-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.org-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-gray);
    font-size: 1rem;
}

.org-features svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.teacher .org-features svg {
    color: var(--secondary-color);
}

/* 추천 대상 */
.recommend {
    background: var(--bg-light);
}

.recommend-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}

.recommend-card {
    background: var(--white);
    padding: 2rem 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.recommend-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: 50%;
    color: var(--primary-color);
    transition: var(--transition);
}

.recommend-card:hover .recommend-icon {
    background: var(--gradient-primary);
    color: var(--white);
    transform: scale(1.1);
}

.recommend-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.recommend-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    line-height: 1.4;
}

.recommend-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 왜 특별한가 */
.why-special {
    background: var(--white);
}

.special-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.special-item {
    text-align: center;
    padding: 2rem;
}

.special-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    transition: var(--transition);
}

.special-item:hover .special-icon {
    background: var(--gradient-primary);
    color: var(--white);
    transform: scale(1.1);
}

.special-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.special-item p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* CTA 섹션 */
.cta-section {
    background: var(--gradient-primary);
    padding: 80px 0;
}

.cta-content {
    text-align: center;
    color: var(--white);
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.cta-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-content .btn-primary {
    background: var(--white);
    color: var(--primary-color);
}

.cta-content .btn-primary:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* 다운로드 섹션 */
.download {
    background: var(--bg-light);
    text-align: center;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.store-button {
    transition: var(--transition);
    display: block;
}

.store-button img {
    height: 56px;
}

.store-button:hover {
    transform: translateY(-4px);
}

/* 문의 섹션 */
.contact {
    background: var(--white);
}

.contact-box {
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-light);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.contact-email-label {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 1.5rem;
}

.contact-email-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    padding: 16px 32px;
    background: var(--white);
    border-radius: 100px;
    border: 2px solid var(--primary-color);
    transition: var(--transition);
}

.contact-email-link:hover {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.contact-email-link svg {
    flex-shrink: 0;
}

/* 푸터 */
footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    color: var(--white);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.95rem;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.9rem;
}

/* 반응형 */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .recommend-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

@media (max-width: 992px) {
    .hero .container,
    .ai-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .section-title.left-align {
        text-align: center;
    }

    .ai-desc {
        text-align: center;
    }

    .ai-features {
        max-width: 500px;
        margin: 0 auto;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 140px 0 80px;
    }

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

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

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-divider {
        width: 60px;
        height: 1px;
    }

    .floating-card {
        display: none;
    }

    section {
        padding: 70px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

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

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

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

    .special-item {
        padding: 1.5rem 1rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr 1fr;
    }

    .cta-content h2 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

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

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

    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        text-align: center;
    }

    .footer-social {
        justify-content: center;
    }
}

/* 스크롤 애니메이션 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.org-card,
.recommend-card,
.special-item {
    animation: fadeInUp 0.6s ease-out;
}

/* 스크롤바 스타일 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}