/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --background: #ffffff;
    --foreground: #0f172a;
    --muted: #f1f5f9;
    --muted-foreground: #64748b;
    --border: #e2e8f0;
    --accent: #10b981;
    --radius: 0.5rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--foreground);
    background: var(--background);
}

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

/* Header */
.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--foreground);
    text-decoration: none;
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    font-weight: bold;
}

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

.nav-menu a {
    color: var(--foreground);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    width: 1.5rem;
    height: 2px;
    background: var(--foreground);
    transition: all 0.3s;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-large {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary);
    color: white !important;
}

.btn-primary:hover {
    background: var(--primary-dark);
/*    transform: translateY(-2px);*/
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--foreground);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(135deg, rgba(240,249,255,0.3), rgba(224,242,254,0.7)),
        url("../img/main_bg.png") no-repeat center;
    background-size: cover;
    
    opacity: 1; /* 여기서 배경만 투명도 조절 */
    
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: white;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--foreground);
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--muted-foreground);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    justify-content: center;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    font-weight: 500;
}

/* Section Styles */
.section {
    padding: 6rem 0;
}

.section-alt {
    background: var(--muted);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--muted-foreground);
}

/* Problems Grid */
.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.problem-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--foreground);
}

.problem-card p {
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Solutions Grid */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.solution-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.solution-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--muted);
    margin-bottom: 1rem;
}

.solution-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.solution-card > p {
    color: var(--muted-foreground);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.solution-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--muted-foreground);
}

.solution-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Target Grid */
.target-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.target-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.target-card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.target-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.target-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.target-card p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

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

.cta-buttons .btn-primary:hover {
    background: var(--muted);
}

.cta-buttons .btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.cta-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.cta-features {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.check-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    font-weight: bold;
}

/* Footer */
.footer {
    background: var(--foreground);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-description {
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

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

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

.footer-column a {
    color: var(--muted-foreground);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.875rem;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

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

.footer-links a {
    color: var(--muted-foreground);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        display: none;
        gap: 0;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border);
    }

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

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

    .hero-buttons {
        flex-direction: column;
    }

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

    .stat-number {
        font-size: 2rem;
    }

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

    .section-description {
        font-size: 1rem;
    }

    .problems-grid,
    .solutions-grid,
    .features-grid,
    .target-grid {
        grid-template-columns: 1fr;
    }

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

    .cta-buttons {
        flex-direction: column;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .section {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

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

.hero-content,
.section-header {
    animation: fadeInUp 0.8s ease-out;
}

.hero-content {
    backdrop-filter: blur(5px);
}