:root {
    /* Colors - Premium Palette */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;

    --bg-app: #f8fafc;
    --bg-surface: #ffffff;
    --bg-sidebar: #0f172a;

    --text-main: #0f172a;
    --text-secondary: #64748b;
    --text-sidebar: #94a3b8;

    --border: #e2e8f0;
    --border-sidebar: #1e293b;

    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Typography */
    --font-heading: Arial, Helvetica, sans-serif;
    --font-body: Arial, Helvetica, sans-serif;
    --font-mono: Consolas, Monaco, 'Courier New', monospace;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

/* Base Styles */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-sidebar);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-sidebar);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
}

.logo-container h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-container .highlight {
    color: var(--primary);
}

.subtitle {
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
    opacity: 0.7;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: 8px;
    background: transparent;
    color: var(--text-sidebar);
    text-align: left;
    font-weight: 500;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: white;
}

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

.nav-item i {
    width: 20px;
    height: 20px;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-sidebar);
}

.sidebar-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-actions .btn {
    text-align: left;
    justify-content: flex-start;
}

.sidebar-actions .btn-outline {
    border-color: var(--border-sidebar);
    color: var(--text-sidebar);
}

.sidebar-actions .btn-outline:hover {
    background-color: var(--border-sidebar);
    color: white;
}

.project-info {
    font-size: 0.8rem;
    margin-bottom: var(--spacing-md);
}

.project-info .label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.project-info .value {
    color: white;
    font-weight: 600;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    /*padding-top: var(--spacing-lg);*/
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    gap: 4px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-app);
    border-color: var(--text-secondary);
}

.btn-icon {
    background: transparent;
    color: var(--text-secondary);
    padding: 6px;
    border-radius: 4px;
}

.btn-icon:hover {
    background-color: var(--bg-app);
    color: var(--text-main);
}

.full-width {
    width: 100%;
}

/* Dashboard View */
.view-section {
    display: none;
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

.view-section.active {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr) 1.5fr;
    gap: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-light);
    color: var(--primary);
}

.stat-icon.concrete {
    background-color: #f3f4f6;
    color: #4b5563;
}

.stat-icon.steel {
    background-color: #e0f2fe;
    color: #0284c7;
}

.stat-icon.density {
    background-color: #dcfce7;
    color: #16a34a;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.stat-unit {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Breakdown Card */
.breakdown-card {
    flex-direction: row;
    justify-content: space-around;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-bottom: 4px;
}

.dot.main {
    background-color: var(--primary);
}

.dot.links {
    background-color: var(--accent-warning);
}

.dot.side {
    background-color: var(--accent-success);
}

.breakdown-item .label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.breakdown-item .val {
    font-size: 0.9rem;
    font-weight: 600;
}

/* Table */
.table-container {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 400px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.table-container.header-hidden {
    display: none;
}

.table-header-row {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header-row h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.table-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.table-responsive {
    flex: 1;
    overflow: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 12px var(--spacing-lg);
    text-align: left;
    white-space: nowrap;
}

.data-table th {
    background-color: var(--bg-app);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    position: sticky;
    top: 0;
    cursor: pointer;
    user-select: none;
}

.data-table th:hover {
    background-color: #e2e8f0;
}

.data-table th i {
    width: 14px;
    height: 14px;
    vertical-align: middle;
    margin-left: 4px;
    opacity: 0.5;
}

.data-table th.sorted-asc,
.data-table th.sorted-desc {
    background-color: #cbd5e1;
    /* Darker than hover #e2e8f0 */
    color: var(--text-main);
}

.data-table th.sorted-asc i,
.data-table th.sorted-desc i {
    opacity: 1;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background-color: var(--primary-light);
}

.data-table td {
    color: var(--text-main);
}

/* Empty State */
.empty-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    border: 2px dashed var(--border);
    border-radius: 12px;
    background-color: var(--bg-app);
}

.empty-content {
    text-align: center;
    max-width: 400px;
}

.empty-icon {
    width: 64px;
    height: 64px;
    background-color: var(--bg-surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.empty-content h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.empty-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Drag overlay */
.drag-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(37, 99, 235, 0.9);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    color: white;
}

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

.drag-content i {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
}

/* Inputs */
input[type="number"] {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 100px;
    font-family: inherit;
    font-size: 0.9rem;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.danger-text {
    color: var(--accent-error);
}

.success-text {
    color: var(--accent-success);
}

/* Animation Utility */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background-color: var(--bg-surface);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    background-color: var(--bg-app);
}

/* Config Settings */
.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.config-card {
    background: var(--bg-surface);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.config-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    color: var(--primary);
}

.text-secondary {
    color: var(--text-secondary);
}

#modal-log-content {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-main);
    background-color: white;
    padding: var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: 8px;
    white-space: pre-wrap;
    line-height: 1.5;
    max-height: 100%;
}

/* Sub-tabs */
.settings-tabs {
    display: flex;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    font-weight: 500;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.text-danger {
    color: var(--accent-error) !important;
}

tr.text-danger td {
    color: var(--accent-error) !important;
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Cookie Consent Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-xl);
    z-index: 3000;
    box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.1);
    display: none;
    /* Hidden by default */
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.cookie-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.cookie-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Settings Enhancements */
.settings-header-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-surface);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.btn-danger {
    color: var(--accent-error);
    border-color: var(--accent-error);
}

.btn-danger:hover {
    background-color: #fef2f2;
}

.config-card input {
    width: 100%;
    margin-top: 4px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    background-color: white;
}

.config-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.config-card h3 input.grade-name-input {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    border: 1px solid var(--border);
    background: white;
    padding: 2px 8px;
    border-radius: 4px;
    width: 80px;
}

.config-card h3 input.grade-name-input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-light);
}

.default-grade-selector {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-left: auto;
    background: var(--bg-app);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid var(--border);
}

.default-grade-selector.selected {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.default-grade-selector input {
    margin: 0;
    width: auto !important;
}

.alert-info {
    background-color: #eff6ff;
    border-left: 4px solid #2563eb;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: 4px;
    font-size: 0.9rem;
    color: #1e40af;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.alert-info i {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Status Overlay & Spinner */
.status-container {
    background: var(--bg-surface);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    width: 300px;
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--primary-light);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.status-text h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.status-text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background-color: var(--bg-app);
    border-radius: 3px;
    overflow: hidden;
    margin-top: var(--spacing-sm);
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}