:root {
    --mattamy-blue: #0b2c71;
    --mattamy-blue-hover: #082155;
    --mattamy-cyan: #3b9db8;
    --bg-light: #f4f6f9;
    --text-dark: #1a1a2e;
    --text-muted: #666666;
    --border-color: #d8dde4;
    --white: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    user-select: none;
}

/* Header Styles */
.app-header {
    background-color: var(--white);
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    box-shadow: var(--shadow);
    z-index: 20;
}

.logo {
    height: 36px;
    width: auto;
}

.header-content {
    text-align: center;
}

.header-content h1 {
    font-size: 1.15rem;
    color: var(--mattamy-blue);
    font-weight: 700;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

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

.offline-badge {
    background-color: #e0f2fe;
    color: #0369a1;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background-color: var(--mattamy-blue);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--mattamy-blue-hover);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    width: 100%;
    text-align: left;
    padding: 0.65rem 0.85rem;
    margin-bottom: 0.4rem;
    border-radius: 6px;
    font-weight: 500;
}

.btn-outline:hover, .btn-outline.active {
    border-color: var(--mattamy-blue);
    background-color: rgba(11, 44, 113, 0.08);
    color: var(--mattamy-blue);
    font-weight: 600;
}

/* Main Layout */
.app-main {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.sidebar {
    width: 300px;
    background-color: var(--white);
    border-right: 1px solid var(--border-color);
    padding: 1.25rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 15;
}

.sidebar-section h2 {
    font-size: 0.85rem;
    color: var(--mattamy-blue);
    margin-bottom: 0.75rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--mattamy-cyan);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Elevation Preview Card in Sidebar */
.elevation-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
}

.elevation-thumb-wrapper {
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.elevation-thumb-wrapper img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.elevation-thumb-wrapper:hover img {
    transform: scale(1.04);
}

.elevation-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background-color: rgba(11, 44, 113, 0.85);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    backdrop-filter: blur(4px);
}

.elevation-overlay-btn {
    position: absolute;
    inset: 0;
    background: rgba(11, 44, 113, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.elevation-overlay-btn span {
    background-color: var(--mattamy-blue);
    color: var(--white);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.4rem 0.85rem;
    border-radius: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.elevation-thumb-wrapper:hover .elevation-overlay-btn {
    opacity: 1;
}

.elevation-meta label {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
    display: block;
}

.options-list {
    list-style: none;
}

.active-tool-box {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background-color: rgba(59, 157, 184, 0.1);
    padding: 0.65rem 0.85rem;
    border-radius: 6px;
    border: 1px solid rgba(59, 157, 184, 0.3);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--mattamy-blue);
}

.tool-help-text {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

.unit-selector-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.unit-select {
    padding: 0.4rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--white);
    color: var(--text-dark);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    width: 100%;
}

.unit-select:focus {
    border-color: var(--mattamy-blue);
}

.measure-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 160px;
    overflow-y: auto;
}

.measure-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-light);
    padding: 0.4rem 0.65rem;
    border-radius: 4px;
    font-size: 0.8rem;
    border-left: 3px solid var(--mattamy-blue);
}

.measure-item button {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    font-weight: bold;
}

.empty-state {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Viewer Container & Canvas Stage */
.viewer-container {
    flex: 1;
    background-color: #e5e7eb;
    position: relative;
    overflow: hidden;
}

.viewport {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    cursor: grab;
}

.viewport.grabbing {
    cursor: grabbing !important;
}

.viewport.mode-measure {
    cursor: crosshair !important;
}

.viewport.mode-text {
    cursor: text !important;
}

.canvas-stage {
    position: absolute;
    transform-origin: 0 0;
    display: inline-block;
    box-shadow: var(--shadow-lg);
    background-color: var(--white);
}

#floorplan-image {
    display: block;
    max-width: none;
    pointer-events: none;
}

/* Overlays */
.draw-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.text-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 6;
}

.annotation-text {
    position: absolute;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.92);
    border: 1.5px solid var(--mattamy-blue);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--mattamy-blue);
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    pointer-events: auto;
    cursor: pointer;
    white-space: nowrap;
}

/* Hotspot Button on Canvas */
.hotspot-btn {
    position: absolute;
    transform: translate(-50%, -50%);
    background-color: var(--mattamy-cyan);
    color: var(--white);
    border: 2px solid var(--white);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    cursor: pointer;
    pointer-events: auto;
    z-index: 10;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(59, 157, 184, 0.7); }
    70% { box-shadow: 0 0 0 12px rgba(59, 157, 184, 0); }
    100% { box-shadow: 0 0 0 0 rgba(59, 157, 184, 0); }
}

/* Floating Toolbar */
.floating-toolbar {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    padding: 0.4rem;
    gap: 0.3rem;
    z-index: 30;
    border: 1px solid var(--border-color);
}

.tool-btn {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all 0.15s ease;
}

.tool-btn:hover {
    background-color: rgba(11, 44, 113, 0.08);
    color: var(--mattamy-blue);
}

.tool-btn.active {
    background-color: var(--mattamy-blue);
    color: var(--white);
}

.tool-btn.accent {
    background-color: rgba(59, 157, 184, 0.15);
    color: var(--mattamy-blue);
}

.tool-btn.accent:hover {
    background-color: var(--mattamy-cyan);
    color: var(--white);
}

.tool-btn.danger:hover {
    background-color: #fee2e2;
    color: #dc2626;
}

.toolbar-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.2rem 0;
}

/* Tooltips */
.tooltip {
    position: absolute;
    right: 50px;
    top: 50%;
    transform: translateY(-50%);
    background-color: #1e293b;
    color: var(--white);
    padding: 0.35rem 0.65rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
    pointer-events: none;
}

.tool-btn:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* 3D Rendering Modal */
.modal-3d {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-3d.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-3d-backdrop {
    position: absolute;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(6px);
}

.modal-3d-container {
    position: relative;
    width: 90vw;
    max-width: 1200px;
    height: 85vh;
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 101;
}

.modal-3d-header {
    height: 64px;
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
}

.modal-title-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.modal-title-group h2 {
    font-size: 1.1rem;
    color: var(--mattamy-blue);
    font-weight: 700;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.elevation-tabs {
    display: flex;
    background-color: var(--bg-light);
    padding: 3px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.elevation-tab {
    padding: 0.4rem 1rem;
    font-size: 0.82rem;
    font-weight: 600;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.elevation-tab.active {
    background-color: var(--mattamy-blue);
    color: var(--white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;

}

.close-btn:hover {
    background-color: var(--bg-light);
    color: var(--text-dark);
}

.modal-3d-body {
    flex: 1;
    background-color: #0f172a;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    padding: 1rem;
}

.modal-3d-body img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Responsive */
@media (max-width: 768px) {
    .app-main {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 35%;
    }
    .header-content {
        display: none;
    }
    .modal-3d-container {
        width: 98vw;
        height: 90vh;
    }
}