:root {
    --primary-color: #0056b3;
    --secondary-color: #28a745;
    --bg-color: #f4f7f9;
    --text-color: #333;
    --light-text: #666;
    --white: #ffffff;
    --border-color: #ddd;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, #0056b3 0%, #003d80 100%);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    position: relative;
}

header h1 {
    margin: 0;
    font-size: 2.2rem;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

header p {
    margin: 0.5rem 0 0;
    opacity: 0.9;
    font-size: 1.1rem;
    font-weight: 300;
}

main {
    padding: 2rem 0;
    flex: 1;
}

section {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

h2 {
    color: var(--primary-color);
    margin-top: 0;
    border-bottom: 2px solid var(--bg-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.flow-btn {
    padding: 1.2rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-width: 200px;
}

.flow-btn:hover, .flow-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,86,179,0.3);
    border-color: var(--primary-color);
}

#report-select {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--white);
}

#dynamic-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.field-group {
    display: flex;
    flex-direction: column;
}

.field-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--light-text);
}

.field-group input, .field-group select {
    padding: 0.7rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.submit-btn {
    padding: 0.8rem 2rem;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.submit-btn:hover {
    background-color: #218838;
}

.reset-btn {
    padding: 0.8rem 2rem;
    background-color: #dc3545;
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
}

.result-container {
    background-color: #272822;
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 5px;
    overflow-x: auto;
}

#json-output {
    margin: 0;
    font-family: 'Consolas', 'Monaco', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.hidden {
    display: none;
}

footer {
    background-color: #1a252f;
    color: #bdc3c7;
    padding: 3rem 0;
    text-align: center;
    border-top: 5px solid var(--primary-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.creator-info {
    font-size: 1rem;
    font-weight: 400;
}

.creator-link {
    color: #3498db;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.creator-link:hover {
    color: #fff;
    border-bottom-color: #3498db;
}

/* Navigation */
.main-nav {
    background: #2c3e50;
    padding: 0.75rem 0;
    margin-bottom: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.main-nav .container {
    display: flex;
    justify-content: center;
    gap: 1rem;
}
.nav-btn {
    background: transparent;
    border: 2px solid #ecf0f1;
    color: #ecf0f1;
    padding: 0.4rem 1.2rem;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
    border-radius: 4px;
}
.nav-btn:hover {
    background: #ecf0f1;
    color: #2c3e50;
}
.nav-btn.active {
    background: #3498db;
    border-color: #3498db;
    color: white;
}

/* Tree View Section */
#tree-content {
    background: linear-gradient(180deg, #e3f2fd 0%, #bbdefb 100%);
    padding: 3rem 0;
    min-height: 80vh;
}

.tree-nav {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tree-tab-btn {
    padding: 1.2rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 220px;
}

.tree-tab-btn:hover, .tree-tab-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0,86,179,0.3);
    border-color: var(--primary-color);
}

.tree-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    min-height: 500px;
    border: 1px solid rgba(255,255,255,0.3);
    overflow-x: auto;
}

/* Mobile Responsiveness for Tree View */
@media (max-width: 768px) {
    #tree-content {
        padding: 1.5rem 0;
    }
    
    .tree-nav {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .tree-tab-btn {
        width: 90%;
        min-width: unset;
        padding: 1rem;
    }
    
    .tree-container {
        padding: 1rem;
        border-radius: 12px;
        margin: 0 10px;
    }
    
    .tree-children {
        margin-left: 1rem;
        padding-left: 0.5rem;
    }
    
    .tree-node-content {
        font-size: 0.85rem;
        padding: 0.4rem;
    }
}
.tree-root {
    list-style: none;
    padding-left: 0;
}
.tree-node {
    margin: 0.5rem 0;
    list-style: none;
    position: relative;
}
.tree-node-content {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    background: #fff;
    transition: all 0.2s;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.tree-node-content:hover {
    background: #f0f7ff;
    border-color: #3498db;
    transform: translateX(5px);
}
.level-badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 10px;
    background: #eee;
    color: #666;
    font-weight: bold;
    border: 1px solid #ccc;
}
.tree-level-1 > .tree-node-content { background: #e3f2fd; border-left: 5px solid #1976d2; font-weight: bold; font-size: 1.1rem; }
.tree-level-2 > .tree-node-content { background: #f1f8e9; border-left: 5px solid #689f38; font-weight: 600; }
.tree-level-3 > .tree-node-content { background: #fffde7; border-left: 5px solid #fbc02d; }
.tree-level-4 > .tree-node-content { background: #fff; border-left: 5px solid #bdbdbd; }
.tree-level-5 > .tree-node-content { background: #fafafa; border-left: 5px solid #eeeeee; font-size: 0.9rem; }
.tree-level-6 > .tree-node-content { background: #f5f5f5; border-left: 5px solid #e0e0e0; font-size: 0.85rem; font-style: italic; }

.tree-children {
    margin-left: 2rem;
    border-left: 2px dashed #ccc;
    padding-left: 1rem;
}
.placeholder-text {
    text-align: center;
    color: #888;
    margin-top: 100px;
}