/* AI 사진 판별기 메인 랜딩 CSS */
body {
    overflow-x: hidden !important;
}

/* 그누보드 기본 컨테이너 족쇄 해제 (메인 페이지 전용 풀스크린) */
#wrapper { min-width: 100% !important; padding: 0 !important; }
#container_wr { width: 100% !important; max-width: 100% !important; margin: 0 !important; padding: 0 !important; }
#container { width: 100% !important; max-width: 100% !important; float: none !important; margin: 0 !important; padding: 0 !important; min-height: auto !important; }

.landing-wrap {
    font-family: 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    width: 100%;
    position: relative;
    overflow-x: hidden;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #0b1f3c 0%, #1e3c72 100%);
    padding: 120px 20px;
    text-align: center;
    color: #fff;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-content {
    max-width: 800px;
    margin: 0 auto;
}
.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
    letter-spacing: -1px;
    line-height: 1.3;
}
.hero-desc {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
    color: #f1f5f9;
}
.btn-primary {
    display: inline-block;
    background-color: #2563eb;
    color: #fff !important;
    padding: 16px 36px;
    font-size: 1.15rem;
    font-weight: bold;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}
.btn-large {
    padding: 18px 45px;
    font-size: 1.25rem;
    background-color: #ffca28;
    color: #0b1f3c !important;
}
.btn-large:hover {
    background-color: #ffe082;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 202, 40, 0.4);
}

/* Section Common */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: #1e293b;
}
.inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
}

/* Features */
.features-section {
    background-color: #f8fafc;
}
.feature-grid {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}
.feature-card {
    flex: 1;
    background: #fff;
    padding: 50px 40px;
    border-radius: 24px;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 10px 25px -4px rgba(0, 0, 0, 0.05);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 25px 35px -5px rgba(0, 0, 0, 0.08);
    border-color: #dbeafe;
}
.feature-card .icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #2563eb;
    font-size: 2rem;
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.5), 0 8px 16px -4px rgba(37, 99, 235, 0.2);
    transition: all 0.4s ease;
}
.feature-card:hover .icon-wrapper {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #fff;
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 20px -5px rgba(37, 99, 235, 0.4);
}
.feature-card h4 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #0f172a;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.feature-card p {
    color: #64748b;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* How it works */
.how-it-works {
    background-color: #fff;
    padding-bottom: 60px;
}
.steps-grid {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    position: relative;
}
.steps-grid::before {
    content: '';
    position: absolute;
    top: 45px;
    left: 15%;
    right: 15%;
    height: 3px;
    background: #e2e8f0;
    z-index: 1;
}
.step-card {
    flex: 1;
    text-align: center;
    position: relative;
    padding: 20px;
    z-index: 2;
}
.step-num {
    width: 90px;
    height: 90px;
    background-color: #fff;
    color: #4338ca;
    border: 6px solid #e0e7ff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 900;
    margin: 0 auto 30px;
    box-shadow: 0 10px 20px -5px rgba(67, 56, 202, 0.15);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
/* PC Hover 상태 및 모바일 Scroll Observer(.on) 상태 공동 적용 */
.step-card:hover .step-num,
.step-card.on .step-num {
    background-color: #4338ca;
    color: #fff;
    border-color: #4338ca;
    transform: scale(1.15);
    box-shadow: 0 15px 25px -5px rgba(67, 56, 202, 0.3);
}
.step-card h4 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #0f172a;
    font-weight: 800;
    letter-spacing: -0.5px;
    transition: color 0.3s ease;
}
.step-card.on h4 {
    color: #4338ca;
}
.step-card p {
    color: #64748b;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #0b1f3c 0%, #1e3c72 100%);
    text-align: center;
    padding: 80px 20px;
}
.cta-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 40px;
}

/* Responsive */
@media (max-width: 768px) {
    .feature-grid, .steps-grid {
        flex-direction: column;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-desc {
        font-size: 1.1rem;
    }
    .hero-section {
        padding: 80px 20px;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .cta-title {
        font-size: 1.8em;
    }
}

/* Drag and Drop Upload Area */
.upload-area {
    margin: 40px auto;
    padding: 60px 20px;
    max-width: 650px;
    /* 기존 얇은 투명선 -> 눈에 확 띄는 밝은 3픽셀 굵은 점선 처리 */
    border: 3px dashed #bbccff;
    border-radius: 20px;
    /* 배경색도 기존보다 더 명확한 대비를 위해 설정 */
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: all 0.3s ease;
}
.upload-area:hover, .upload-area.dragover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #ffca28;
}
.upload-area p {
    color: #e2e8f0;
    margin: 0;
    font-size: 1.15em;
    line-height: 1.6;
}
.upload-area strong {
    color: #fff;
    font-weight: bold;
}