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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 800px;
    width: 100%;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2em;
    margin-bottom: 10px;
}

.content {
    padding: 30px;
}

.signature-section {
    margin: 20px 0;
}

.signature-pad {
    border: 3px solid #11998e;
    border-radius: 12px;
    cursor: crosshair;
    touch-action: none;
    display: block;
    width: 100%;
    background: #fafafa;
}

.controls {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.button {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
    font-weight: 500;
}

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

.button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.button-clear {
    background: #dc3545;
    color: white;
    flex: 1;
}

.button-submit {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    flex: 2;
}

.info-box {
    background: #e7f9f5;
    border-left: 4px solid #11998e;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    display: none;
    margin-top: 20px;
}

.success-message.show {
    display: block;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #11998e;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    display: none;
}

.error-message.show {
    display: block;
}

.pdf-display {
    margin: 20px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
    text-align: center;
    display: none;
}

.pdf-display.show {
    display: block;
}

.pdf-display h3 {
    margin-bottom: 15px;
    color: #11998e;
}

.pdf-preview-canvas {
    max-width: 100%;
    border: 2px solid #11998e;
    border-radius: 8px;
    background: white;
    display: block;
    margin: 10px auto;
}

.page-separator {
    text-align: center;
    margin: 20px 0;
    padding: 10px;
    background: linear-gradient(135deg, #11998e15 0%, #38ef7d15 100%);
    border-radius: 8px;
    font-weight: bold;
    color: #11998e;
}

.waiting-message {
    text-align: center;
    padding: 40px;
    color: #666;
}

.waiting-message .icon {
    font-size: 3em;
    margin-bottom: 20px;
}