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

:root {
    --primary-blue: #667eea;
    --secondary-blue: #764ba2;
    --trust-green: #48bb78;
    --calm-gray: #f8fafc;
    --professional-dark: #2d3748;
    --accent-orange: #ed8936;
    --warning-red: #e53e3e;
    --text-dark: #333;
    --text-light: #666;
    --white: #ffffff;
    --gold: #ffd700;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

/* Hero Section */
.hero {
    background: 
        linear-gradient(135deg, rgba(45, 55, 72, 0.85) 0%, rgba(74, 85, 104, 0.8) 50%, rgba(102, 126, 234, 0.75) 100%),
        url('https://images.unsplash.com/photo-1506905925346-21bda4d32df4?ixlib=rb-4.0.3&auto=format&fit=crop&w=2560&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    color: var(--white);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--professional-dark) 0%, #4a5568 50%, var(--primary-blue) 100%);
    z-index: -1;
    opacity: 0.3;
}

.hero-content {
    flex: 1;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.highlight {
    color: var(--gold);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.1);
    padding: 0.8rem 1.2rem;
    border-radius: 20px;
    backdrop-filter: blur(5px);
}

.feature-item i {
    color: var(--gold);
}

.cta-button {
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    color: var(--white);
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    font-weight: 600;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.cta-button i {
    margin-right: 0.5rem;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mental-health-illustration {
    position: relative;
    width: 300px;
    height: 300px;
}

.brain-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    color: var(--gold);
    z-index: 3;
}

.progress-rings {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.ring {
    position: absolute;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

.ring-1 {
    width: 100px;
    height: 100px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 0s;
}

.ring-2 {
    width: 150px;
    height: 150px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 1s;
}

.ring-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 2s;
}

@keyframes pulse {
    0%, 100% { 
        opacity: 0.3; 
        transform: translate(-50%, -50%) scale(1); 
    }
    50% { 
        opacity: 0.8; 
        transform: translate(-50%, -50%) scale(1.1); 
    }
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--professional-dark);
}

/* Problem Section */
.problem-section {
    padding: 5rem 0;
    background: 
        linear-gradient(rgba(248, 250, 252, 0.95), rgba(248, 250, 252, 0.95)),
        url('https://images.unsplash.com/photo-1559757148-5c350d0d3c56?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.symptoms-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.symptom-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-left: 5px solid;
    transition: transform 0.3s ease;
}

.symptom-card:hover {
    transform: translateY(-5px);
}

.symptom-card.depression {
    border-left-color: #4299e1;
}

.symptom-card.helplessness {
    border-left-color: var(--accent-orange);
}

.symptom-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--white);
}

.depression .symptom-icon {
    background: #4299e1;
}

.helplessness .symptom-icon {
    background: var(--accent-orange);
}

.symptom-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--professional-dark);
}

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

.symptom-list li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.symptom-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-orange);
    font-weight: bold;
}

.problem-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    text-align: center;
    flex-wrap: wrap;
}

.stat-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    min-width: 200px;
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

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

.stat-label {
    color: var(--text-light);
    line-height: 1.4;
}

/* Science Section */
.science-section {
    padding: 5rem 0;
    background: 
        linear-gradient(45deg, rgba(255, 255, 255, 0.98) 0%, rgba(248, 250, 252, 0.98) 100%),
        url('https://images.unsplash.com/photo-1559757175-0eb30cd8c063?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.science-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.science-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    color: var(--professional-dark);
}

.science-intro {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.science-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--white);
    border-radius: 15px;
    border-left: 4px solid var(--primary-blue);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateX(5px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.feature-content h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--professional-dark);
}

.feature-content p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.reliability {
    font-size: 0.85rem;
    color: var(--primary-blue);
    font-weight: 600;
}

.research-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--white);
    border-radius: 10px;
    border-left: 3px solid #cbd5e0;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.timeline-item.current {
    border-left-color: var(--primary-blue);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.year {
    font-weight: bold;
    color: var(--primary-blue);
    min-width: 50px;
}

.event {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Benefits Section */
.benefits-section {
    padding: 5rem 0;
    background: 
        linear-gradient(135deg, rgba(248, 250, 252, 0.9) 0%, rgba(237, 242, 247, 0.9) 100%),
        url('https://images.unsplash.com/photo-1506905925346-21bda4d32df4?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
}

.benefit-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--white);
    font-size: 1.5rem;
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--professional-dark);
}

.benefit-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* How Section */
.how-section {
    padding: 5rem 0;
    background: var(--white);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.step {
    background: var(--calm-gray);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    max-width: 250px;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
}

.step:hover {
    border-color: var(--primary-blue);
    transform: translateY(-5px);
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--professional-dark);
}

.step p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
}

.step-arrow {
    color: var(--primary-blue);
    font-size: 1.5rem;
}

/* CTA Section */
.cta-section {
    padding: 5rem 0;
    background: 
        linear-gradient(135deg, rgba(45, 55, 72, 0.9) 0%, rgba(74, 85, 104, 0.85) 50%, rgba(102, 126, 234, 0.8) 100%),
        url('https://images.unsplash.com/photo-1559757148-5c350d0d3c56?ixlib=rb-4.0.3&auto=format&fit=crop&w=2560&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-guarantees {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.guarantee {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
}

.guarantee i {
    color: var(--gold);
}

.main-cta-button {
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    color: var(--white);
    border: none;
    padding: 1.2rem 3rem;
    font-size: 1.3rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    font-weight: 600;
    margin-bottom: 1rem;
}

.main-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0,0,0,0.4);
}

.main-cta-button i {
    margin-right: 0.8rem;
}

.disclaimer {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 1rem;
}

/* Footer */
.footer {
    background: var(--professional-dark);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-info h3 {
    margin-bottom: 0.5rem;
}

.footer-info p {
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        background-attachment: scroll;
    }
    
    .cta-section {
        background-attachment: scroll;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 1rem;
    }
    
    .symptoms-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .problem-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .science-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
    
    .cta-guarantees {
        flex-direction: column;
        align-items: center;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .main-cta-button {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
    
    .symptom-card,
    .benefit-card {
        padding: 1.5rem;
    }
}

/* 고해상도 디스플레이 대응 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero {
        background-image: 
            linear-gradient(135deg, rgba(45, 55, 72, 0.85) 0%, rgba(74, 85, 104, 0.8) 50%, rgba(102, 126, 234, 0.75) 100%),
            url('https://images.unsplash.com/photo-1506905925346-21bda4d32df4?ixlib=rb-4.0.3&auto=format&fit=crop&w=5120&q=80');
    }
    
    .cta-section {
        background-image: 
            linear-gradient(135deg, rgba(45, 55, 72, 0.9) 0%, rgba(74, 85, 104, 0.85) 50%, rgba(102, 126, 234, 0.8) 100%),
            url('https://images.unsplash.com/photo-1559757148-5c350d0d3c56?ixlib=rb-4.0.3&auto=format&fit=crop&w=5120&q=80');
    }
}

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

.hero-content {
    animation: fadeInUp 1s ease-out;
}

/* 스크롤 바 커스터마이징 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-blue);
}

/* 포커스 스타일 */
button:focus,
a:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* 선택 텍스트 스타일 */
::selection {
    background-color: var(--primary-blue);
    color: var(--white);
}

/* 부드러운 스크롤 */
html {
    scroll-behavior: smooth;
}