body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: #f0f2f5;
}
.navbar {
    background: linear-gradient(135deg, #1a237e 0%, #283593 100%) !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.navbar-nav .nav-link {
    display: flex;
    align-items: center;
    color: #ffffff !important;
    font-weight: 500;
    padding: 1rem 1.5rem;
    transition: all 0.3s ease;
}
.navbar-nav .nav-link:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}
.navbar-nav .nav-link svg {
    margin-right: 10px;
    width: 22px;
    height: 22px;
    fill: #ffffff;
    transition: transform 0.3s;
}
.navbar-nav .nav-link:hover svg {
    transform: scale(1.1) rotate(5deg);
}
.container {
    margin-top: 40px;
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}
#map {
    height: 500px;
    width: 100%;
    margin-top: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    display: none;
}
.animated-title {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 35px;
    color: #1a237e;
    font-weight: 700;
    animation: fadeIn 2s ease-in-out;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}
.form-label {
    color: #1a237e;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
}
.form-select {
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 12px;
    font-size: 1rem;
    transition: all 0.3s;
    background-color: #fff;
}
.form-select:focus {
    border-color: #1a237e;
    box-shadow: 0 0 0 0.25rem rgba(26,35,126,0.15);
}
.intro-text {
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    border-left: 5px solid #1a237e;
    line-height: 1.6;
}
.intro-text p {
    margin-bottom: 15px;
    color: #2c3e50;
}
.index-selection {
    display: none;
    animation: slideIn 0.5s ease-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}
.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}
.selection-row {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
    box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
@media (max-width: 768px) {
    .animated-title {
        font-size: 2rem;
    }
    #map {
        height: 350px;
    }
    .container {
        padding: 1.5rem;
        margin-top: 20px;
    }
    .selection-row {
        padding: 15px;
    }
}

.guide-section {
    margin-bottom: 40px;
    padding: 25px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
}

.guide-section h2 {
    color: #1a237e;
    font-size: 1.8rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #1a237e;
}

.guide-section p {
    color: #2c3e50;
    line-height: 1.7;
    margin-bottom: 15px;
}

.guide-list {
    list-style-type: none;
    padding-left: 0;
}

.guide-list li {
    padding: 12px 0;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    align-items: center;
}

.guide-list li svg {
    width: 24px;
    height: 24px;
    margin-right: 15px;
    fill: #1a237e;
}

.guide-list li:last-child {
    border-bottom: none;
}

.tip-box {
    background: #f8f9fa;
    border-left: 4px solid #1a237e;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
}

@media (max-width: 768px) {
    .guide-section {
        padding: 15px;
    }
    
    .guide-section h2 {
        font-size: 1.5rem;
    }
}

.tech-details {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin: 15px 0;
}

.tech-details h3 {
    color: #1a237e;
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.tech-details ul, .tech-details ol {
    padding-left: 20px;
}

.tech-details li {
    margin-bottom: 10px;
    color: #2c3e50;
    line-height: 1.6;
}

.version-history .version {
    border-left: 3px solid #1a237e;
    padding-left: 20px;
    margin-bottom: 25px;
}

.version-history .date {
    color: #666;
    font-style: italic;
    margin: 5px 0;
}

.version h3 {
    color: #1a237e;
    margin-bottom: 5px;
}

@media (max-width: 768px) {
    .tech-details {
        padding: 15px;
    }
    
    .version-history .version {
        padding-left: 15px;
    }
}