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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --warning-color: #f59e0b;
    --bg-color: #f0f4f8;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --header-gradient: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 50%, #1e3a5f 100%);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    padding: 30px 20px 40px;
    background: var(--header-gradient);
    color: white;
    margin-bottom: 30px;
    border-radius: 0 0 24px 24px;
    box-shadow: 0 4px 20px rgba(30, 58, 95, 0.3);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.header p {
    opacity: 0.9;
    font-size: 1rem;
    font-weight: 400;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 32px;
    margin-bottom: 24px;
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-title svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--bg-color);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area svg {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.upload-area p {
    color: var(--text-muted);
    margin-bottom: 10px;
}

.upload-area .file-types {
    font-size: 0.875rem;
    color: var(--text-muted);
}

#file-input {
    display: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #15803d;
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    padding: 10px;
    border-radius: 8px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--bg-color);
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    background: white;
}

.form-group input::placeholder {
    color: #a0aec0;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-group label {
    cursor: pointer;
    font-size: 0.95rem;
}

/* PDF List */
.pdf-list {
    display: grid;
    gap: 15px;
}

.pdf-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease;
}

.pdf-item:hover {
    box-shadow: var(--shadow);
}

.pdf-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.pdf-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 0.75rem;
}

.pdf-details h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.pdf-details p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.pdf-actions {
    display: flex;
    gap: 10px;
}

/* PDF Preview */
.pdf-preview-container {
    background: #525659;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.pdf-canvas-wrapper {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow: auto;
    max-height: 70vh;
    min-height: 400px;
    background: #3a3d40;
    border-radius: 8px;
    padding: 20px;
}

#pdf-canvas {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    background: white;
}

.pdf-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
}

.pdf-controls-group {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.2);
    padding: 6px 10px;
    border-radius: 8px;
}

.pdf-controls button {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.pdf-controls button:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.25);
}

.pdf-controls button.active {
    background: var(--primary-color);
}

.pdf-controls .zoom-level {
    color: white;
    font-size: 0.85rem;
    min-width: 50px;
    text-align: center;
    font-weight: 500;
}

.pdf-controls .divider {
    width: 1px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 5px;
}

.pdf-controls button:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
}

.pdf-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pdf-controls span {
    color: white;
    font-size: 0.95rem;
}

/* Link Display */
.link-display {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.link-display input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--bg-color);
}

/* Share Options */
.share-options {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    text-decoration: none;
    transition: transform 0.2s ease;
}

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

.share-whatsapp {
    background: #25D366;
    color: white;
}

.share-email {
    background: var(--primary-color);
    color: white;
}

/* Messages */
.message {
    padding: 16px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.message-success {
    background: rgba(22, 163, 74, 0.1);
    border: 1px solid rgba(22, 163, 74, 0.2);
    color: var(--success-color);
}

.message-error {
    background: rgba(220, 38, 38, 0.1);
    border: 1px solid rgba(220, 38, 38, 0.2);
    color: var(--error-color);
}

.message-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.message-info {
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    color: var(--primary-color);
}

/* Signature Form */
.signature-form {
    max-width: 500px;
    margin: 0 auto;
}

.signature-form .form-group {
    margin-bottom: 24px;
}

/* Confirmation Page */
.confirmation-box {
    text-align: center;
    padding: 40px;
}

.confirmation-icon {
    width: 80px;
    height: 80px;
    background: rgba(22, 163, 74, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.confirmation-icon svg {
    width: 40px;
    height: 40px;
    color: var(--success-color);
}

.confirmation-box h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.confirmation-box p {
    color: var(--text-muted);
}

/* Signatures List */
.signatures-list {
    margin-top: 20px;
}

.signature-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: var(--bg-color);
    border-radius: 8px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
}

.signature-info h4 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.signature-info p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.signature-time {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: right;
}

/* Loading Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 15px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header {
        padding: 30px 15px;
        border-radius: 0 0 15px 15px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 20px;
    }

    .pdf-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .pdf-actions {
        width: 100%;
    }

    .pdf-actions .btn {
        flex: 1;
    }

    .upload-area {
        padding: 30px 20px;
    }

    .link-display {
        flex-direction: column;
    }

    .share-options {
        flex-direction: column;
    }

    .share-btn {
        justify-content: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.gap-10 {
    gap: 10px;
}

.w-full {
    width: 100%;
}