:root {
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --secondary-color: #f8f9fa;
    --secondary-hover: #e9ecef;
    --text-color: #212529;
    --light-text: #6c757d;
    --border-color: #dee2e6;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: #f5f7fa;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.header p {
    font-size: 1.1rem;
    color: var(--light-text);
}

.tool-container {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.upload-section {
    margin-bottom: 2rem;
}

.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dropzone:hover {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.dropzone svg {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.dropzone h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.dropzone p {
    color: var(--light-text);
}

#pdf-upload {
    display: none;
}

.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    margin-top: 1rem;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.file-details svg {
    color: var(--primary-color);
}

.signature-section {
    margin-bottom: 2rem;
}

.tab-container {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 0.8rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.tab-content {
    display: none;
    padding: 1.5rem;
}

.tab-content.active {
    display: block;
}

.signature-pad-container {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    background-color: var(--white);
}

#signature-pad {
    width: 100%;
    height: 200px;
    background-color: var(--white);
    cursor: crosshair;
}

.signature-actions {
    display: flex;
    justify-content: flex-end;
}

.typed-signature-container {
    margin-bottom: 1rem;
}

#typed-signature {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.signature-preview {
    height: 100px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background-color: var(--white);
}

.font-options {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

#font-select {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.position-section {
    margin-bottom: 2rem;
}

.position-section h3 {
    margin-bottom: 1rem;
}

.position-options {
    display: flex;
    gap: 2rem;
}

.position-preview {
    flex: 1;
}

.page-mockup {
    width: 100%;
    height: 300px;
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    background-image: linear-gradient(#f1f1f1 1px, transparent 1px),
                      linear-gradient(90deg, #f1f1f1 1px, transparent 1px);
    background-size: 20px 20px;
}

.signature-marker {
    width: 100px;
    height: 40px;
    background-color: rgba(67, 97, 238, 0.2);
    border: 1px dashed var(--primary-color);
    position: absolute;
    cursor: move;
}

.position-controls {
    flex: 1;
}

.control-group {
    margin-bottom: 1rem;
}

.control-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 500;
}

.control-group input[type="range"] {
    width: 100%;
    margin-right: 0.5rem;
}

.control-group input[type="number"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.primary-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
}

.primary-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background-color: var(--secondary-hover);
}

/* Responsive styles */
@media (max-width: 768px) {
    .position-options {
        flex-direction: column;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .primary-btn, .secondary-btn {
        width: 100%;
    }
}