:root {
    /* Modern Dark Palette (Zinc-inspired) */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --primary-glow: rgba(59, 130, 246, 0.15);

    --bg-darker: #09090b;
    /* Canvas background */
    --bg-dark: #121215;
    /* Sidebar/Header background */
    --bg-panel: #1a1a1e;
    /* Input/Card background */
    --bg-hover: #27272a;
    /* Hover state */

    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;

    --border: #27272a;
    --border-light: #3f3f46;

    /* Effects */
    --header-blur: blur(12px);
    --glass-bg: rgba(18, 18, 21, 0.85);
    --glass-border: 1px solid rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-darker);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.01em;
}

.app-container {
    display: grid;
    grid-template-columns: 60px 1fr 320px;
    grid-template-rows: 50px 1fr;
    height: 100vh;
    width: 100vw;
}

/* Top Bar */
.top-bar {
    grid-column: 1 / -1;
    background: var(--glass-bg);
    backdrop-filter: var(--header-blur);
    -webkit-backdrop-filter: var(--header-blur);
    border-bottom: var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 100;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.warning-badge {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: #fbbf24;
    padding: 4px 10px;
    border-radius: 99px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.top-bar-right {
    display: flex;
    gap: 8px;
}

.top-btn-group {
    display: flex;
    gap: 8px;
}

.top-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-btn .icon {
    font-size: 14px;
}

.top-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

/* Left Sidebar - Toolbar */
.left-sidebar {
    background: var(--bg-dark);
    border-right: var(--glass-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 0;
    gap: 8px;
    z-index: 90;
}

/* Tooltip Balloon */
.tool-button[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(8px);
    background: rgba(15, 15, 20, 0.9);
    color: #fff;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 1000;
    margin-left: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.02em;
}

/* Tooltip Arrow */
.tool-button[data-tooltip]::before {
    content: '';
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(8px);
    border-width: 5px;
    border-style: solid;
    border-color: transparent rgba(15, 15, 20, 0.9) transparent transparent;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 1000;
    margin-left: 0px;
}

.tool-button:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

.tool-button:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

.tool-button {
    width: 42px;
    height: 42px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.tool-button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.tool-button.active {
    background: var(--primary-glow);
    color: var(--primary-light);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.2);
}

.tool-button span {
    filter: grayscale(100%) opacity(0.7);
    transition: all 0.2s;
}

.tool-button:hover span,
.tool-button.active span {
    filter: none;
    opacity: 1;
}

/* Remove old indicator */
.tool-button.active::before {
    display: none;
}

.tool-separator {
    width: 30px;
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

/* Main Viewer Area */
.viewer-area {
    background: var(--bg-darker);
    position: relative;
    overflow: hidden;
    cursor: crosshair;
}

.viewer-area.pan-mode {
    cursor: grab;
}

.viewer-area.pan-mode:active {
    cursor: grabbing;
}

.viewer-area.zoom-mode {
    cursor: zoom-in;
}

.viewer-area.wl-mode {
    cursor: ns-resize;
}

#dicomImage {
    width: 100%;
    height: 100%;
    background: #000;
}

.overlay-info {
    position: absolute;
    top: 12px;
    left: 12px;
    color: var(--primary);
    font-family: 'Courier New', monospace;
    font-size: 11px;
    line-height: 1.6;
    text-shadow: 0 0 4px rgba(0, 0, 0, 0.8);
    pointer-events: none;
    display: none;
}

.overlay-info.active {
    display: block;
}

.pixel-probe {
    position: absolute;
    background: rgba(0, 0, 0, 0.85);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 10px;
    pointer-events: none;
    display: none;
    white-space: nowrap;
}

.measurement-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.image-nav {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: none;
    gap: 8px;
}

.image-nav.active {
    display: flex;
}

.nav-button {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: 30px;
    /* Pill shape */
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.nav-button:hover:not(:disabled) {
    background: rgba(59, 130, 246, 0.3);
    border-color: var(--primary);
}

.nav-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Right Sidebar - Panels */
.right-sidebar {
    background: var(--bg-dark);
    border-left: var(--glass-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.right-sidebar::-webkit-scrollbar {
    width: 6px;
}

.right-sidebar::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

.right-sidebar::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

.panel {
    border-bottom: var(--glass-border);
    padding: 16px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.panel-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* File Upload */
.upload-area {
    border: 2px dashed var(--border-light);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: var(--bg-panel);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.upload-area input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 32px;
    margin-bottom: 8px;
    opacity: 0.5;
}

.upload-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.upload-hint {
    font-size: 10px;
    color: var(--text-tertiary);
}

/* Presets */
.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 12px;
}

.preset-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 8px;
    border-radius: 4px;
    font-size: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--primary);
}

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

/* Controls */
.control-group {
    margin-bottom: 16px;
}

.control-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 11px;
}

.control-name {
    color: var(--text-secondary);
    font-weight: 500;
}

.control-value {
    background: var(--primary);
    color: white;
    padding: 2px 8px;
    border-radius: 3px;
    font-weight: 600;
    font-size: 10px;
    min-width: 50px;
    text-align: center;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--bg-panel);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 0 2px var(--bg-dark), 0 0 0 4px var(--primary);
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 2px solid var(--bg-dark);
}

/* Action Buttons */
.action-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.action-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

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

.action-btn.primary:hover {
    background: var(--primary-dark);
}

.action-btn:active {
    background: var(--bg-darker);
    transform: scale(0.95);
}

.action-btn.primary:active {
    background: var(--primary-dark);
    transform: scale(0.95);
}

.action-btn.clicked {
    animation: buttonClick 0.3s ease;
}

@keyframes buttonClick {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(0.95);
        background: var(--bg-darker);
    }

    100% {
        transform: scale(1);
    }
}

.action-btn.primary.clicked {
    animation: buttonClickPrimary 0.3s ease;
}

@keyframes buttonClickPrimary {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(0.95);
        background: var(--primary-dark);
    }

    100% {
        transform: scale(1);
    }
}

/* Measurements Panel */
.measurements-list {
    max-height: 200px;
    overflow-y: auto;
}

.measurement-item {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 8px;
    margin-bottom: 6px;
    font-size: 11px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.measurement-info {
    flex: 1;
}

.measurement-item .label {
    color: var(--text-tertiary);
    font-size: 9px;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.measurement-item .value {
    color: var(--primary);
    font-weight: 600;
}

.delete-measurement {
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.2s;
}

.delete-measurement:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* DICOM Tags Table */
.tags-search {
    width: 100%;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 11px;
    margin-bottom: 12px;
}

.tags-search:focus {
    outline: none;
    border-color: var(--primary);
}

.tags-search::placeholder {
    color: var(--text-tertiary);
}

.tags-table-wrapper {
    max-height: 400px;
    overflow-y: auto;
    margin: -16px;
    padding: 16px;
}

.tags-table-wrapper::-webkit-scrollbar {
    width: 6px;
}

.tags-table-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

.tags-table {
    width: 100%;
    font-size: 10px;
    border-collapse: collapse;
}

.tags-table thead th {
    position: sticky;
    top: 0;
    background: var(--bg-dark);
    color: var(--text-tertiary);
    font-weight: 600;
    text-align: left;
    padding: 8px 4px;
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tags-table tbody td {
    padding: 6px 4px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.tags-table tbody tr:hover {
    background: var(--bg-panel);
}

.tag-editable {
    cursor: pointer;
    border-radius: 2px;
    padding: 2px 4px;
    margin: -2px -4px;
}

.tag-editable:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-light);
}

.tag-input {
    width: 100%;
    background: var(--bg-darker);
    border: 1px solid var(--primary);
    color: var(--text-primary);
    padding: 4px 6px;
    border-radius: 3px;
    font-size: 10px;
    font-family: 'Courier New', monospace;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 48px;
    opacity: 0.3;
    margin-bottom: 12px;
}

.empty-state-text {
    font-size: 12px;
    margin-bottom: 4px;
}

.empty-state-hint {
    font-size: 10px;
}

/* Responsive */
@media (max-width: 1200px) {
    .app-container {
        grid-template-columns: 60px 1fr;
    }

    .right-sidebar {
        display: none;
    }
}


/* Context Menu */
.context-menu {
    position: fixed;
    background: rgba(26, 26, 30, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 6px;
    min-width: 180px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: none;
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

.context-menu-item:hover {
    background: var(--primary);
    color: white;
}

.context-menu-item span {
    font-size: 16px;
}

.context-menu-separator {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}