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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
    color: #1a1a1a;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    user-select: none;
}

/* ===== ICON TOOLBAR (pdf.net style) ===== */
#toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 16px;
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
    border: none;
    background: none;
    min-width: 56px;
}

.tool-btn:hover {
    background: #f3f4f6;
}

.tool-btn.active {
    background: #eff6ff;
    color: #2563eb;
}

.tool-btn.primary {
    background: #2563eb;
    color: #fff;
}

.tool-btn.primary:hover {
    background: #1d4ed8;
}

.tool-btn.primary .tool-icon,
.tool-btn.primary .tool-label {
    color: #fff;
}

.tool-icon {
    font-size: 20px;
    line-height: 1;
    color: #555;
}

.tool-label {
    font-size: 10px;
    color: #666;
    white-space: nowrap;
}

.tool-btn.active .tool-icon,
.tool-btn.active .tool-label {
    color: #2563eb;
}

.tool-btn.password-active {
    background: #fef3c7;
}

.tool-btn.password-active .tool-icon,
.tool-btn.password-active .tool-label {
    color: #92400e;
}

.toolbar-divider {
    width: 1px;
    height: 36px;
    background: #e0e0e0;
    margin: 0 8px;
}

/* ===== SETTINGS BAR ===== */
#settings-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 4px 16px;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
    flex-shrink: 0;
    font-size: 12px;
}

.settings-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.settings-group label {
    color: #666;
    white-space: nowrap;
}

.settings-group select,
.settings-group input[type="number"],
.settings-group input[type="password"] {
    padding: 4px 8px;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    background: #fff;
    color: #333;
    font-size: 12px;
}

.settings-group input[type="number"] {
    width: 55px;
    -moz-appearance: textfield;
}

.settings-group input[type="number"]::-webkit-inner-spin-button,
.settings-group input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.settings-group input[type="password"] {
    width: 120px;
}

.target-size-label {
    font-size: 12px;
    color: #666;
}

/* ===== MAIN LAYOUT ===== */
#main-layout {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* ===== LEFT SIDEBAR ===== */
#sidebar {
    width: 120px;
    min-width: 120px;
    background: #fff;
    border-right: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

#sidebar-header {
    display: flex;
    gap: 4px;
    padding: 6px;
    border-bottom: 1px solid #eee;
}

#sidebar-header button {
    flex: 1;
    padding: 4px 6px;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    background: #fff;
    color: #555;
    font-size: 10px;
    cursor: pointer;
    transition: background 0.15s;
}

#sidebar-header button:hover { background: #f3f4f6; }
#sidebar-header button.danger:hover { background: #fee2e2; color: #dc2626; }

#sidebar-pages {
    flex: 1;
    overflow-y: auto;
    padding: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* ===== SIDEBAR PAGE THUMBNAIL ===== */
.sidebar-page {
    position: relative;
    border: 2px solid transparent;
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
    background: #fafafa;
}

.sidebar-page:hover {
    border-color: #d1d5db;
}

.sidebar-page.active {
    border-color: #2563eb;
    box-shadow: 0 0 0 2px rgba(37,99,235,0.15);
}

.sidebar-page.selected {
    border-color: #60a5fa;
    background: #eff6ff;
}

.sidebar-page img {
    display: block;
    width: 100%;
    border-radius: 2px;
}

.sidebar-page-num {
    position: absolute;
    bottom: 2px;
    right: 4px;
    font-size: 9px;
    color: #999;
    background: rgba(255,255,255,0.8);
    padding: 0 3px;
    border-radius: 2px;
}

.sidebar-page .page-delete-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 3px;
    background: rgba(255,255,255,0.9);
    color: #999;
    font-size: 12px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.sidebar-page:hover .page-delete-btn {
    display: flex;
}

.sidebar-page .page-delete-btn:hover {
    background: #fee2e2;
    color: #dc2626;
}

/* Sortable ghost */
.sidebar-page.sortable-ghost { opacity: 0.3; }
.sidebar-page.sortable-chosen { box-shadow: 0 2px 8px rgba(0,0,0,0.15); }

/* ===== CENTER VIEWER ===== */
#viewer {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #e5e7eb;
    position: relative;
}

#empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-prompt {
    border: 3px dashed #ccc;
    border-radius: 16px;
    padding: 60px 80px;
    text-align: center;
    color: #999;
}

.drop-prompt p:first-child {
    font-size: 20px;
    margin-bottom: 8px;
}

.drop-prompt p:last-child {
    font-size: 14px;
}

#viewer-canvas-wrap {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#viewer-canvas {
    background: #fff;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.12);
    max-width: 100%;
    max-height: calc(100vh - 160px);
}

/* ===== DROP OVERLAY ===== */
#drop-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(37, 99, 235, 0.08);
    border: 4px dashed #2563eb;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

#drop-overlay.active { display: flex; }

#drop-overlay span {
    font-size: 22px;
    color: #2563eb;
    font-weight: 600;
    background: rgba(255,255,255,0.9);
    padding: 16px 32px;
    border-radius: 12px;
}

/* ===== STATUS BAR ===== */
#status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 14px;
    background: #fff;
    border-top: 1px solid #ddd;
    font-size: 11px;
    color: #888;
    flex-shrink: 0;
}

#progress-container { display: flex; align-items: center; gap: 8px; }
#progress-container progress { width: 140px; height: 5px; border-radius: 3px; }
#progress-container progress::-webkit-progress-bar { background: #e5e7eb; border-radius: 3px; }
#progress-container progress::-webkit-progress-value { background: #2563eb; border-radius: 3px; }

/* ===== TOAST ===== */
#toast-container {
    position: fixed;
    bottom: 40px;
    right: 16px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: #1f2937;
    color: #fff;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 13px;
    max-width: 350px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    animation: toastIn 0.2s ease-out;
}

.toast.error { background: #dc2626; }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== MODALS ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.modal-overlay[hidden] { display: none; }

.modal-dialog {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    min-width: 320px;
    max-width: 480px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-dialog h3 {
    margin-bottom: 16px;
    font-size: 16px;
    color: #1a1a1a;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.modal-body label {
    font-size: 12px;
    color: #666;
    font-weight: 600;
}

.modal-body select,
.modal-body input[type="number"] {
    padding: 7px 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    background: #fff;
    color: #333;
    font-size: 13px;
}

.modal-body button {
    padding: 10px 16px;
    border: 1px solid #ccc;
    border-radius: 6px;
    background: #fff;
    color: #333;
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    transition: background 0.15s, border-color 0.15s;
}

.modal-body button:hover { background: #f0f0f0; border-color: #aaa; }
.modal-body button.primary { background: #2563eb; color: #fff; border-color: #2563eb; }
.modal-body button.primary:hover { background: #1d4ed8; }

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.modal-footer button {
    padding: 7px 14px;
    border: 1px solid #ccc;
    border-radius: 6px;
    background: #fff;
    color: #333;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s;
}

.modal-footer button:hover { background: #f0f0f0; }
.modal-footer button.primary { background: #2563eb; color: #fff; border-color: #2563eb; }
.modal-footer button.primary:hover { background: #1d4ed8; }
.modal-footer button.danger { color: #dc2626; border-color: #fca5a5; }
.modal-footer button.danger:hover { background: #fee2e2; }

/* ===== PAGE NUMBERS MODAL ===== */
.position-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.position-grid label {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 8px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    font-size: 11px;
    font-weight: normal;
    transition: background 0.15s, border-color 0.15s;
}

.position-grid label:has(input:checked) {
    background: #eff6ff;
    border-color: #2563eb;
    color: #2563eb;
}

.position-grid input[type="radio"] {
    accent-color: #2563eb;
}

.pn-formats {
    display: flex;
    gap: 8px;
}

.pn-formats label {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 10px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: normal;
    transition: background 0.15s;
}

.pn-formats label:has(input:checked) {
    background: #eff6ff;
    border-color: #2563eb;
    color: #2563eb;
}

.pn-formats input[type="radio"] {
    accent-color: #2563eb;
}

/* ===== PREVIEW MODAL ===== */
.preview-dialog {
    min-width: auto;
    max-width: 90vw;
    width: 90vw;
    height: 90vh;
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.preview-header h3 { margin: 0; font-size: 15px; }

.preview-nav { display: flex; align-items: center; gap: 10px; }

.preview-nav button {
    width: 32px; height: 32px;
    border: 1px solid #ccc; border-radius: 6px;
    background: #fff; cursor: pointer; font-size: 16px;
    display: flex; align-items: center; justify-content: center;
}

.preview-nav button:hover:not(:disabled) { background: #f0f0f0; }
.preview-nav button:disabled { opacity: 0.3; cursor: default; }
#preview-page-info { font-size: 13px; color: #555; min-width: 60px; text-align: center; }

.preview-actions { display: flex; gap: 8px; }
.preview-actions button {
    padding: 7px 14px; border: 1px solid #ccc; border-radius: 6px;
    background: #fff; color: #333; font-size: 13px; cursor: pointer;
}
.preview-actions button:hover { background: #f0f0f0; }
.preview-actions button.primary { background: #2563eb; color: #fff; border-color: #2563eb; }
.preview-actions button.primary:hover { background: #1d4ed8; }

#preview-canvas-container {
    flex: 1; overflow: auto;
    display: flex; align-items: center; justify-content: center;
    background: #e5e7eb; padding: 20px;
}

#preview-canvas {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
    max-width: 100%;
    max-height: 100%;
}