/* ============================================================
 *  signature.css — Studio Editor Layout for PDF Signature
 *  Supports: 2-Column Studio Mode, Zoom, Auto-Clean BG, Dark Mode
 * ============================================================ */

/* Container Studio Layout */
.sig-container {
    max-width: 1100px;
    width: 100%;
}

/* ── Initial Upload View ── */
.sig-upload-view {
    max-width: 680px;
    margin: 0 auto;
}

/* ── 2-Column Studio Grid ── */
.sig-studio-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 24px;
    align-items: flex-start;
    margin-top: 16px;
}

/* ── Column 1: Document Viewport Panel (Left) ── */
.sig-viewport-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 18px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
}

.sig-viewport-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 18px;
    background: var(--bg-subtle);
    border-bottom: 1px solid var(--border-subtle);
    gap: 12px;
    flex-wrap: wrap;
}

.sig-page-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-main);
}

.sig-page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-card);
    border-radius: 8px;
    color: var(--text-main);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    transition: all 0.2s;
}

.sig-page-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.sig-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.sig-zoom-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.sig-zoom-btn {
    padding: 5px 10px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-card);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.sig-zoom-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.sig-zoom-val {
    min-width: 44px;
    text-align: center;
}

/* Canvas Viewport */
.sig-canvas-scroll-wrap {
    background: #0f172a;
    overflow: auto;
    padding: 24px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 520px;
    max-height: 680px;
}

[data-theme="dark"] .sig-canvas-scroll-wrap {
    background: #060910;
}

.pdf-preview-container {
    position: relative;
    display: inline-block;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    background: #ffffff;
    user-select: none;
}

#pdfPreviewCanvas {
    display: block;
    max-width: 100%;
}

/* Overlay & Handle */
.sig-overlay {
    position: absolute;
    cursor: move;
    user-select: none;
    border: 2px dashed var(--primary);
    border-radius: 4px;
    box-sizing: border-box;
    z-index: 10;
    transition: box-shadow 0.2s;
}

.sig-overlay:hover {
    box-shadow: 0 0 12px var(--primary-glow);
}

.sig-overlay img {
    width: 100%;
    height: auto;
    display: block;
    pointer-events: none;
}

.resize-handle {
    position: absolute;
    bottom: -8px;
    right: -8px;
    width: 16px;
    height: 16px;
    background: var(--primary);
    border: 2px solid white;
    border-radius: 50%;
    cursor: se-resize;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.sig-viewport-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 18px;
    background: var(--bg-subtle);
    border-top: 1px solid var(--border-subtle);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.sig-coords-info {
    display: flex;
    gap: 12px;
}

.sig-coords-info strong {
    color: var(--text-main);
}

/* ── Column 2: Sidebar Tools Panel (Right) ── */
.sig-sidebar-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sig-sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 16px;
    padding: 18px 20px;
    box-shadow: var(--shadow-sm);
}

.sig-doc-info-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.sig-doc-meta {
    flex: 1;
    min-width: 0;
}

.sig-doc-name {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sig-doc-sub {
    font-size: 0.76rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Section Titles */
.sig-section-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Tabs */
.tab-group {
    display: flex;
    gap: 4px;
    background: var(--bg-subtle);
    padding: 4px;
    border-radius: 10px;
    margin-bottom: 14px;
    border: 1px solid var(--border-subtle);
}

.tab-btn {
    flex: 1;
    padding: 8px 4px;
    border: none;
    background: transparent;
    border-radius: 7px;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-muted);
    transition: all 0.2s;
    text-align: center;
}

.tab-btn:hover { color: var(--text-main); }

.tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Draw Canvas */
.canvas-wrapper {
    position: relative;
    border: 1.5px solid var(--border-subtle);
    border-radius: 10px;
    overflow: hidden;
    background: #ffffff;
    cursor: crosshair;
    touch-action: none;
}

#signatureCanvas {
    display: block;
    width: 100%;
    height: 140px;
}

.canvas-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #a0aec0;
    font-size: 0.85rem;
    pointer-events: none;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.canvas-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.canvas-controls input[type="color"] {
    width: 28px;
    height: 28px;
    padding: 0;
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}

/* Type Signature */
.type-wrapper {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.type-text-input {
    padding: 9px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    color: var(--text-main);
    background: var(--bg-subtle);
}

.type-text-input:focus {
    border-color: var(--border-focus);
    background: var(--bg-card);
}

.type-options {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
}

.option-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.option-row select {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    font-size: 0.82rem;
    font-family: inherit;
    color: var(--text-main);
    background: var(--bg-card);
    cursor: pointer;
    outline: none;
}

#typeCanvas {
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    width: 100%;
    height: 90px;
    background: #ffffff;
    display: block;
}

/* Upload Signature */
.upload-sig-area {
    border: 2px dashed var(--border-subtle);
    border-radius: 10px;
    padding: 24px 14px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-muted);
    font-size: 0.85rem;
    background: var(--bg-subtle);
}

.upload-sig-area:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-sig-hint {
    font-size: 0.74rem;
    color: var(--text-subtle);
    margin-top: 4px;
}

.upload-preview-canvas {
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    width: 100%;
    background: #ffffff;
    display: block;
    margin-top: 10px;
}

.magic-btn-clean {
    width: 100%;
    margin-top: 10px;
    padding: 8px 12px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Controls */
.sig-control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 10px;
}

.sig-control-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-main);
}

.sig-control-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sig-control-row input[type="range"] {
    flex: 1;
}

/* Responsive */
@media (max-width: 960px) {
    .sig-studio-layout {
        grid-template-columns: 1fr;
    }

    .sig-canvas-scroll-wrap {
        min-height: 400px;
        max-height: 520px;
    }
}