.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.develop-tool {
    max-width: 100%;
    margin: 0 auto;
}

.develop-tool.editor-section,
.editor-section.develop-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.develop-tool .card:not(.result-card) {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.develop-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.develop-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.develop-tool .form-control,
.develop-tool .form-select,
.develop-tool .select-input,
.develop-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.develop-tool .form-control:focus,
.develop-tool .form-select:focus,
.develop-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.develop-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.develop-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.develop-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .develop-tool .card:not(.result-card) {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .develop-tool .card-title,
[data-theme="dark"] .develop-tool .form-label,
[data-theme="dark"] .develop-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .develop-tool .text-muted,
[data-theme="dark"] .develop-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .develop-tool .form-control,
[data-theme="dark"] .develop-tool .form-select,
[data-theme="dark"] .develop-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: e-signature --- */
.signature-tool {
    max-width: 1200px;
    margin: 0 auto;
}

.preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    background: 
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: 0.5rem;
    border: 2px dashed #dee2e6;
}

.preview-area {
    background: white;
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 300px;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.signature-preview {
    font-family: 'Allura-Regular', cursive;
    font-size: 60px;
    color: #000000;
    letter-spacing: 2px;
    white-space: nowrap;
    user-select: none;
    cursor: default;
}

.signature-preview.vertical {
    writing-mode: vertical-rl;
    text-orientation: upright;
    white-space: nowrap;
}

.card {
    border: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    border-radius: 0.75rem;
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    border-radius: 0.75rem 0.75rem 0 0 !important;
}

.btn {
    transition: all 0.2s ease-in-out;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.form-range {
    cursor: pointer;
}

.form-control-color {
    width: 3rem;
    height: 2.5rem;
    padding: 0.25rem;
}

@media (max-width: 768px) {
    .preview-container {
        min-height: 250px;
    }
    
    .preview-area {
        min-width: 250px;
        min-height: 150px;
        padding: 1rem;
    }
    
    .signature-preview {
        font-size: 40px;
    }
}