@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #f093fb;
    --bg-dark: #0f0f1e;
    --bg-card: #1a1a2e;
    --bg-hover: #25253e;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --border: #2d3748;
    --success: #48bb78;
    --warning: #ed8936;
    --danger: #f56565;
    --shadow: rgba(102, 126, 234, 0.15);
    --shadow-lg: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1a2e 100%);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* Container */
.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    background: rgba(26, 26, 46, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    height: 72px;
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 72px);
}

/* Sidebar */
.sidebar {
    width: 360px;
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    flex-shrink: 0;
}

.sidebar h3 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Upload Section */
.upload-section {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border: 2px dashed var(--primary);
    border-radius: 12px;
    text-align: center;
}

/* Tools Section */
.tool-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tool-btn:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    color: var(--text-primary);
    transform: translateX(4px);
}

.tool-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 12px var(--shadow);
}

.tool-btn svg {
    flex-shrink: 0;
}

/* Annotations List */
.annotations-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.annotation-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.annotation-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.annotation-item>div:first-child {
    flex: 1;
    min-width: 0;
    margin-right: 0.5rem;
    overflow: hidden;
}

.annotation-item .annotation-text {
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.annotation-item .annotation-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.annotation-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.edit-btn,
.delete-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.edit-btn:hover {
    background: var(--bg-hover);
    color: var(--primary);
    transform: scale(1.1);
}

.delete-btn:hover {
    background: rgba(245, 101, 101, 0.1);
    color: var(--danger);
    transform: scale(1.1);
}

.edit-btn.active {
    color: var(--warning);
    background: var(--bg-hover);
    transform: scale(1.1);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 2rem 1rem;
}

/* API Section */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group input {
    padding: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-group small {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* API Status Indicator */
.api-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.status-dot.inactive {
    background-color: var(--text-secondary);
}

.status-dot.active {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-dot.error {
    background-color: var(--danger);
    box-shadow: 0 0 8px var(--danger);
}

.status-dot.testing {
    background-color: var(--warning);
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.status-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.btn-sm {
    padding: 0.5rem 1rem !important;
    font-size: 0.8rem !important;
}

/* Password Toggle */
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.password-wrapper input {
    width: 100%;
    padding-right: 40px;
}

button.password-toggle {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    background-color: transparent;
    background-image: none;
    border: none;
    outline: none;
    box-shadow: none;
    color: var(--text-secondary);
    padding: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color 0.2s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

button.password-toggle:hover,
button.password-toggle:focus,
button.password-toggle:active {
    background: none;
    background-color: transparent;
    color: var(--primary);
    outline: none;
    box-shadow: none;
}

button.password-toggle svg {
    width: 18px;
    height: 18px;
    pointer-events: none;
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    background: var(--bg-dark);
}

.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 1.5rem;
    padding: 3rem;
    text-align: center;
}

.drop-zone svg {
    color: var(--primary);
    opacity: 0.5;
}

.drop-zone h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

.drop-zone p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.drop-zone.drag-over {
    background: rgba(102, 126, 234, 0.1);
}

/* Canvas Container */
.canvas-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.canvas-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 0.75rem;
    background: rgba(26, 26, 46, 0.9);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    z-index: 10;
}

.control-btn {
    padding: 0.5rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
}

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

#zoomLevel {
    min-width: 60px;
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
}

.page-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 2rem;
    padding-left: 2rem;
    border-left: 1px solid var(--border);
}

#pageInfo {
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-width: 100px;
    text-align: center;
}

/* Canvas Wrapper - CRITICAL FOR CENTERING AND OVERLAY */
.canvas-wrapper {
    flex: 1;
    overflow: scroll;
    /* Always show scrollbars */
    position: relative;
    padding: 0;
    display: grid;
    grid-template-columns: 20px 1fr;
    grid-template-rows: 20px 1fr;
    background:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.05) 0%, transparent 50%);
}

/* Custom Scrollbar Styling for Canvas Wrapper - Very Visible */
.canvas-wrapper {
    /* Firefox scrollbar */
    scrollbar-width: auto;
    scrollbar-color: #888888 #333340;
}

.canvas-wrapper::-webkit-scrollbar {
    width: 20px !important;
    height: 20px !important;
}

.canvas-wrapper::-webkit-scrollbar-track {
    background: #333340 !important;
    border: 1px solid #444;
}

.canvas-wrapper::-webkit-scrollbar-thumb {
    background: #888888 !important;
    border: 2px solid #555;
    min-height: 40px;
}

.canvas-wrapper::-webkit-scrollbar-thumb:hover {
    background: #aaaaaa !important;
}

.canvas-wrapper::-webkit-scrollbar-thumb:active {
    background: #cccccc !important;
}

.canvas-wrapper::-webkit-scrollbar-corner {
    background: #333340 !important;
}

/* Ruler Corner (top-left square) */
.ruler-corner {
    grid-column: 1;
    grid-row: 1;
    background: #1a1a2e;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    z-index: 20;
}

/* Ruler Styles - Fixed patterns that never change */
.ruler {
    background: #1a1a2e;
    z-index: 15;
    display: block;
}

.ruler-horizontal {
    grid-column: 2;
    grid-row: 1;
    height: 20px;
    width: 100%;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    /* Fixed tick pattern - small every 10px, large every 50px */
    background:
        repeating-linear-gradient(90deg,
            #4a5568 0px,
            #4a5568 1px,
            transparent 1px,
            transparent 10px),
        repeating-linear-gradient(90deg,
            #4a5568 0px,
            #4a5568 1px,
            transparent 1px,
            transparent 50px),
        #1a1a2e;
    background-size: 10px 5px, 50px 10px, 100% 100%;
    background-position: 0 100%, 0 100%, 0 0;
    background-repeat: repeat-x;
}

.ruler-vertical {
    grid-column: 1;
    grid-row: 2;
    width: 20px;
    height: 100%;
    border-right: 1px solid var(--border);
    position: sticky;
    left: 0;
    /* Fixed tick pattern - small every 10px, large every 50px */
    background:
        repeating-linear-gradient(180deg,
            #4a5568 0px,
            #4a5568 1px,
            transparent 1px,
            transparent 10px),
        repeating-linear-gradient(180deg,
            #4a5568 0px,
            #4a5568 1px,
            transparent 1px,
            transparent 50px),
        #1a1a2e;
    background-size: 5px 10px, 10px 50px, 100% 100%;
    background-position: 100% 0, 100% 0, 0 0;
    background-repeat: repeat-y;
}

/* Guide lines overlay - covers entire wrapper */
.guide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
}

/* Canvas holder for stacking - CRITICAL: Both canvases must be exactly aligned */
.canvas-holder {
    grid-column: 2;
    grid-row: 2;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
}

/* Container for stacking canvases exactly on top of each other */
.canvas-stack {
    position: relative;
    display: inline-block;
}

#pdfCanvas {
    display: block;
    border-radius: 4px;
    z-index: 1;
    box-shadow: 0 20px 60px var(--shadow-lg);
}

#annotationCanvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    border-radius: 4px;
    z-index: 10;
    pointer-events: auto;
    cursor: crosshair;
    background: transparent;
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar,
.canvas-wrapper::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.sidebar::-webkit-scrollbar-track,
.canvas-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb,
.canvas-wrapper::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.canvas-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-body textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.3s ease;
}

.modal-body textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.modal-options {
    margin-top: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

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

.checkbox-label span {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .main-content {
        flex-direction: column;
    }

    .header {
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }
}

/* Inline Text Editor Panel */
.text-editor-panel {
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid var(--primary);
    border-radius: 12px;
    padding: 1rem;
    margin-top: -1rem;
}

.text-editor-panel h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.text-editor-panel .editor-content textarea {
    width: 100%;
    min-height: 80px;
    padding: 0.75rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 1rem;
}

.text-editor-panel .editor-content textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.text-editor-panel .editor-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.text-editor-panel .control-row {
    display: flex;
    gap: 1rem;
}

.text-editor-panel .control-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.text-editor-panel .control-group label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.text-editor-panel select,
.text-editor-panel input[type="number"] {
    padding: 0.5rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    width: 100%;
}

.text-editor-panel .color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 0.35rem;
    border-radius: 6px;
}

.text-editor-panel .color-picker-wrapper input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 20px;
    height: 20px;
    padding: 0;
    margin: 0;
    background: none;
    cursor: pointer;
    border-radius: 4px;
}

.text-editor-panel #colorValue,
.text-editor-panel #bgColorValue {
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    flex: 1;
}

/* Eyedropper Button */
.eyedropper-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

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

.text-editor-panel .style-toggles {
    display: flex;
    gap: 0.35rem;
}

.text-editor-panel .style-toggle .toggle-btn {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
}

.text-editor-panel .ai-option {
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

.text-editor-panel .ai-option .checkbox-label {
    font-size: 0.85rem;
}

.text-editor-panel .ai-option .checkbox-label input {
    width: 16px;
    height: 16px;
}

.text-editor-panel .editor-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.text-editor-panel .editor-actions .btn {
    flex: 1;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
}

/* ============================== */
/* Tab Bar Styles */
/* ============================== */
.tab-bar {
    display: flex;
    align-items: center;
    background: rgba(26, 26, 46, 0.8);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
    gap: 0.25rem;
    min-height: 44px;
}

.tabs-container {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    overflow-x: auto;
    scrollbar-width: thin;
}

.tabs-container::-webkit-scrollbar {
    height: 4px;
}

.tabs-container::-webkit-scrollbar-track {
    background: transparent;
}

.tabs-container::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

.tab-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    max-width: 180px;
    min-width: 100px;
}

.tab-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.tab-item.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tab-item .tab-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.8rem;
    font-weight: 500;
}

.tab-item .tab-close {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    opacity: 0.6;
    transition: all 0.2s;
    padding: 0;
    font-size: 14px;
    line-height: 1;
}

.tab-item .tab-close:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
}

.tab-item.active .tab-close:hover {
    background: rgba(0, 0, 0, 0.2);
}

.tab-add-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px dashed var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.tab-add-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    border-style: solid;
    color: white;
}

/* ============================== */
/* Canvas Main Area */
/* ============================== */
.canvas-main-area {
    flex: 1;
    display: flex;
    position: relative;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    display: flex;
    position: relative;
}

/* Drop zone centering */
.canvas-main-area .drop-zone {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ============================== */
/* Right Sidebar Controls */
/* ============================== */
.vertical-controls {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 72px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    border-left: 1px solid var(--border);
    z-index: 100;
}

.zoom-controls-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.page-controls-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.zoom-level-vertical {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    background: transparent;
    padding: 0.25rem 0;
    text-align: center;
}

/* Page Display - Box Style */
.page-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
}

.current-page-box {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 2px solid var(--primary);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
}

.total-pages {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.divider-vertical {
    width: 48px;
    height: 1px;
    background: var(--border);
    margin: 0.25rem 0;
}

/* Zoom Buttons - Larger */
.vertical-controls .zoom-btn {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.vertical-controls .zoom-btn:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.vertical-controls .zoom-btn svg {
    width: 24px;
    height: 24px;
}

/* Page Nav Buttons - Smaller */
.vertical-controls .page-nav-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.vertical-controls .page-nav-btn:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.vertical-controls .page-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.vertical-controls .page-nav-btn svg {
    width: 14px;
    height: 14px;
}

/* ================================
   Shape Tool Styles
   ================================ */

.shape-tool-container {
    position: relative;
    width: 100%;
}

.shape-tool-container .tool-btn {
    width: 100%;
}

.shape-popup {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 10px 40px var(--shadow-lg);
    z-index: 1000;
    margin-top: 8px;
    overflow: hidden;
}

.shape-popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    background: rgba(102, 126, 234, 0.1);
}

.shape-popup-header h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-popup-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: color 0.2s;
}

.close-popup-btn:hover {
    color: var(--danger);
}

.shape-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    padding: 12px;
}

.shape-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 6px;
    background: var(--bg-dark);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.shape-option:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.shape-option.selected {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.15);
    color: var(--primary);
}

.shape-option svg {
    width: 24px;
    height: 24px;
}

.shape-option span {
    font-size: 0.65rem;
    font-weight: 500;
    text-align: center;
}

.shape-settings {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.shape-setting-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.shape-setting-row label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 80px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.shape-style-toggle {
    display: flex;
    gap: 4px;
}

.shape-style-toggle .style-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.shape-style-toggle .style-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.shape-style-toggle .style-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.shape-color-picker {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 4px 8px;
    border-radius: 6px;
    flex: 1;
}

.shape-color-picker input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 20px;
    height: 20px;
    padding: 0;
    margin: 0;
    background: none;
    cursor: pointer;
    border-radius: 4px;
}

.shape-color-picker input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.shape-color-picker input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 4px;
}

.shape-color-picker span {
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.shape-setting-row input[type="range"] {
    flex: 1;
    height: 4px;
    background: var(--bg-dark);
    border-radius: 2px;
    -webkit-appearance: none;
    appearance: none;
}

.shape-setting-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
}

.shape-setting-row #strokeWidthValue {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 30px;
    text-align: right;
}