:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #00d2ff;
    --text-color: #1a202c;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

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

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Modern Header */
.modern-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.modern-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.logo img {
    height: 40px;
    width: auto;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-btn {
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-login {
    color: var(--text-color);
}

.btn-login:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

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

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

/* Modern Hero Section */
.modern-hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 120px 2rem 80px;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0.1;
    background-size: 200% 200%;
    animation: gradient 15s ease infinite;
}

.grid-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
    margin-bottom: 60px;
}

.hero-badge-modern {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    color: var(--primary-color);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-title-modern {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-color);
    letter-spacing: -2px;
}

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

.hero-description-modern {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-buttons-modern {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-modern {
    padding: 14px 32px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
}

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

.btn-primary-modern:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-outline-modern {
    background: var(--bg-white);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-outline-modern:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Hero Features */
.hero-features {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    max-width: 1000px;
    width: 100%;
    margin-top: 60px;
}

.feature-card-modern {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.3s ease;
}

.feature-card-modern:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 12px;
}

.feature-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-color);
}

.feature-content p {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Section Container */
.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Problem Section */
.problem-section {
    padding: 100px 0;
    background: var(--bg-white);
}

.section-header-modern {
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header-modern h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-color);
    letter-spacing: -1px;
}

.section-header-modern p {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.7;
}

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

.problem-card-modern {
    background: var(--bg-white);
    padding: 32px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.problem-card-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

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

.problem-card-modern:hover::before {
    transform: scaleY(1);
}

.problem-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.problem-icon-wrapper {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.problem-icon {
    font-size: 2rem;
}

.problem-number {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-light);
    opacity: 0.5;
}

.problem-card-modern h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-color);
}

.problem-card-modern p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Solution Section */
.solution-section {
    padding: 100px 0;
    background: var(--bg-light);
}

.solution-header-modern {
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.solution-steps-modern {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.step-card-modern {
    background: var(--bg-white);
    padding: 32px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

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

.step-number-modern {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.step-content-modern h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
}

.step-content-modern p {
    color: var(--text-light);
    line-height: 1.7;
}

.step-arrow {
    position: absolute;
    top: 32px;
    right: 32px;
    font-size: 1.5rem;
    color: var(--primary-color);
    opacity: 0.3;
}

.step-card-modern:last-child .step-arrow {
    display: none;
}

/* Value Section */
.value-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    color: white;
}

.value-header-modern {
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.value-header-modern .section-label {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.value-header-modern h2 {
    color: white;
}

.value-header-modern p {
    color: rgba(255, 255, 255, 0.7);
}

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

.value-card-modern {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.value-card-modern:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.value-icon-modern {
    margin: 0 auto 24px;
    width: 64px;
    height: 64px;
}

.value-card-modern h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: white;
}

.value-card-modern p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

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

.cta-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.cta-container h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    color: white;
}

.cta-container p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* Modern Footer */
.modern-footer {
    background: #1a202c;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-logo {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    font-size: 0.875rem;
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s ease;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .problem-grid-modern,
    .solution-steps-modern,
    .value-grid-modern {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 1rem;
    }
    
    .hero-buttons-modern {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-modern {
        width: 100%;
        justify-content: center;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}