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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #f8fafc;
}

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

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: #7c3aed;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.nav-links a {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: #7c3aed;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #7c3aed;
    transition: width 0.3s ease;
}

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

/* Hero Section with Photo Background */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    margin-top: 0;
    
    /* Background Image - Research/University focused */
    background-image: linear-gradient(
        rgba(0, 0, 0, 0.4), 
        rgba(0, 0, 0, 0.4)
    ), url('../assets/images/interveiws.png');
    
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
}

/* Subtle overlay for better text readability */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg, 
        rgba(124, 58, 237, 0.1) 0%, 
        rgba(55, 48, 163, 0.1) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    background: linear-gradient(45deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto 3rem;
    line-height: 1.7;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
    background: rgba(255, 255, 255, 0.15);
    padding: 1.5rem;
    border-radius: 15px;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    transition: transform 0.3s ease;
}

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

.hero-stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
    color: white;
}

.hero-stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255, 255, 255, 0.9);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        background-attachment: scroll;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .hero-content {
        padding: 1rem;
    }
}

/* Main Content */
.main-content {
    padding: 5rem 0;
}

.section {
    margin-bottom: 5rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.content-card {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.content-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #374151;
    margin-bottom: 1.5rem;
}

.content-text:last-child {
    margin-bottom: 0;
}

.highlight-text {
    background: linear-gradient(120deg, #e0e7ff 0%, #c7d2fe 100%);
    padding: 0.2em 0.4em;
    border-radius: 6px;
    font-weight: 600;
    color: #3730a3;
}

/* Research Process Grid */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.research-item {
    background: #f8fafc;
    padding: 2.5rem;
    border-radius: 15px;
    border-left: 4px solid #7c3aed;
    transition: transform 0.3s ease;
}

.research-item:hover {
    transform: translateX(5px);
}

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

.research-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.research-description {
    color: #6b7280;
    line-height: 1.6;
}

/* Testimonial Section */
/* Testimonials Section with Background Image */
.testimonials {
    background: linear-gradient(
        rgba(119, 119, 119, 0.408), 
        rgba(133, 133, 133, 0.912)
    ), url('../assets/images/longtermtest.png');
    
    /* Alternative background images:
    
    // Happy students/testimonials
    background: linear-gradient(rgba(30, 58, 138, 0.8), rgba(55, 48, 163, 0.8)), url('https://images.unsplash.com/photo-1543269664-647b80d59c8b?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
    
    // University students group
    background: linear-gradient(rgba(30, 58, 138, 0.8), rgba(55, 48, 163, 0.8)), url('https://images.unsplash.com/photo-1523240795612-9a054b0db644?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
    
    // People with phones/technology
    background: linear-gradient(rgba(30, 58, 138, 0.8), rgba(55, 48, 163, 0.8)), url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=2340&q=80');
    */
    
    background-size: cover;
    background-position: center;
    color: white;
    border-radius: 20px;
    padding: 4rem;
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

/* 기존 스타일은 그대로 유지 */
.testimonials::before {
    content: '"';
    font-size: 15rem;
    position: absolute;
    top: -2rem;
    left: 2rem;
    opacity: 0.1;
    font-family: serif;
    z-index: 1;
}

.testimonial-grid {
    position: relative;
    z-index: 2;
}

.testimonial-stats {
    position: relative;
    z-index: 2;
}

/* Awards Grid */
.awards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 3rem auto;
            max-width: 1200px;
        }

        .award-card {
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
            min-height: 200px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        /* 배경 이미지를 위한 가상 요소 */
        .award-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        /* 컬러 오버레이 바 */
        .award-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #fbbf24, #f59e0b);
            z-index: 2;
        }

        .award-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .award-card:hover::before {
            opacity: 0.25;
            transform: scale(1.05);
        }

        /* 콘텐츠를 배경 위에 표시 */
        .award-icon,
        .award-title,
        .award-year {
            position: relative;
            z-index: 1;
        }

        .award-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
        }

        .award-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 0.5rem;
            text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
        }

        .award-year {
            font-size: 0.9rem;
            color: #7c3aed;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.7);
            padding: 0.2em 0.5em;
            border-radius: 4px;
            display: inline-block;
        }

        /* 각 award-card에 고유한 배경 이미지 설정 */
        .award-1::before {
            background-image: url('../assets/images/team/teamphoto12.png');
            /* 트로피/우승 이미지 */
        }

        .award-2::before {
            background-image: url('../assets/images/team/teamphoto7.png');
            /* 별/시상식 이미지 */
        }

        .award-3::before {
            background-image: url('../assets/images/team/mvp.png');
            /* 모바일 앱 이미지 */
        }

        .award-4::before {
            background-image: url('../assets/images/team/SWFes.png');
            /* 아이디어/축제 이미지 */
        }

        .award-5::before {
            background-image: url('../assets/images/team/postech.jpg');
            /* 로켓/스타트업 이미지 */
        }

        .award-6::before {
            background-image: url('../assets/images/team/gov.png');
            /* 투자/자금 이미지 */
        }

        .award-7::before {
            background-image: url('../assets/images/team/naserver.png');
            /* 앱 런치 이미지 */
        }

        .award-8::before {
            background-image: url('../assets/images/team/RPMgrand.png');
            /* 대상/그랜드프라이즈 이미지 */
        }

        .award-9::before {
            background-image: url('../assets/images/team/teamphoto8.png');
            /* 대상/그랜드프라이즈 이미지 */
        }

        /* 다크 테마 배경 옵션 */
        .award-card.dark-theme {
            background: linear-gradient(135deg, rgba(31, 41, 55, 0.9), rgba(55, 65, 81, 0.9));
            color: white;
        }

        .award-card.dark-theme .award-title {
            color: #f3f4f6;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .award-card.dark-theme .award-year {
            background: rgba(124, 58, 237, 0.9);
            color: white;
        }

/* Experts Section */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0;
}

.expert-item {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border-left: 3px solid #7c3aed;
    transition: transform 0.3s ease;
}

.expert-item:hover {
    transform: translateX(3px);
}

.expert-role {
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.3rem;
}

.expert-org {
    font-size: 0.9rem;
    color: #6b7280;
}

/* Partnership Section */
.partnership-section {
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    border-radius: 20px;
    padding: 4rem;
    text-align: center;
    margin: 4rem 0;
}

.partnership-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.partnership-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.partnership-item:hover {
    transform: translateY(-3px);
}

.partnership-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #7c3aed;
}

.partnership-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.partnership-description {
    color: #6b7280;
    font-size: 0.95rem;
}

/* CTA Buttons */
.cta-section {
    text-align: center;
    margin: 4rem 0;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.btn {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: 200px;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, #7c3aed, #3730a3);
    color: white;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
}

.btn-secondary {
    background: white;
    color: #7c3aed;
    border: 2px solid #7c3aed;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    background: #7c3aed;
    color: white;
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0;
    text-align: center;
    margin-top: 1rem;
}

.footer-content {
    color: #d1d5db;
    line-height: 1.6;
}

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

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 10px;
    }

    .content-card {
        padding: 2rem;
    }

    .research-grid,
    .awards-grid,
    .experts-grid {
        grid-template-columns: 1fr;
    }

    .testimonials {
        padding: 2.5rem;
    }

    .partnership-section {
        padding: 2.5rem;
    }

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

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

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
.btn:focus,
.nav-links a:focus {
    outline: 2px solid #7c3aed;
    outline-offset: 2px;
}

/* App Store Links */
.app-store-section {
    background: #f8fafc;
    padding: 4rem 0;
    text-align: center;
}

.app-store-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1a202c;
}

.app-store-content p {
    font-size: 1.2rem;
    color: #4a5568;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.store-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.store-button {
    display: inline-block;
    transition: transform 0.3s ease;
}

.store-button:hover {
    transform: translateY(-2px);
}

.store-button img {
    height: 60px;
    width: auto;
}