:root {
    /* Google Material Design Dark Theme */
    --bg-primary: #121212;
    /* Default Background */
    --bg-secondary: #1E1E1E;
    /* Elevated Surface 1 */
    --bg-tertiary: #2C2C2C;
    /* Elevated Surface 2 */

    --text-primary: rgba(255, 255, 255, 0.87);
    /* High-emphasis */
    --text-secondary: rgba(255, 255, 255, 0.60);
    /* Medium-emphasis */
    --text-muted: rgba(255, 255, 255, 0.38);
    /* Disabled/Hint */

    --accent-color: #BB86FC;
    /* Material Primary */
    --accent-hover: #D0A9F5;
    /* Primary Variant */
    --accent-glow: rgba(187, 134, 252, 0.16);
    /* Material ripple/focus hint */

    --danger-color: #CF6679;
    /* Material Error */
    --danger-hover: #E57373;

    --success-color: #03DAC6;
    /* Material Secondary */
    --success-hover: #018786;

    --border-color: rgba(255, 255, 255, 0.12);
    /* Standard Divider */

    /* Typography */
    --font-main: 'Roboto', sans-serif;

    /* Material Elevations (Shadows) */
    --shadow-sm: 0 1px 1px 0 rgba(0, 0, 0, 0.14), 0 2px 1px -1px rgba(0, 0, 0, 0.12), 0 1px 3px 0 rgba(0, 0, 0, 0.20);
    /* 1dp */
    --shadow-md: 0 3px 3px -2px rgba(0, 0, 0, 0.20), 0 3px 4px 0 rgba(0, 0, 0, 0.14), 0 1px 8px 0 rgba(0, 0, 0, 0.12);
    /* 3dp */
    --shadow-lg: 0 5px 5px -3px rgba(0, 0, 0, 0.20), 0 8px 10px 1px rgba(0, 0, 0, 0.14), 0 3px 14px 2px rgba(0, 0, 0, 0.12);
    /* 8dp */
    --shadow-glow: 0 8px 10px -5px rgba(0, 0, 0, 0.20), 0 16px 24px 2px rgba(0, 0, 0, 0.14), 0 6px 30px 5px rgba(0, 0, 0, 0.12);
    /* 16dp Dialogs */

    /* Material Shapes */
    --radius-md: 4px;
    /* Standard Material Border Radius */
    --radius-lg: 8px;
    /* Modals */
    --radius-xl: 12px;

    /* Material Motion */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-norm: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #BB86FC, #03DAC6);
    /* Update gradient to primary/secondary colors */
    background-clip: text;
    /* Add standard background-clip */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

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

/* Buttons */
button {
    font-family: var(--font-main);
    cursor: pointer;
    border: none;
    outline: none;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--accent-color);
    color: #121212;
    /* Material Dark theme contrast */
    padding: 0 16px;
    height: 36px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active {
    box-shadow: var(--shadow-lg);
    /* Material physical click simulation */
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: transparent;
    color: var(--accent-color);
    padding: 0 16px;
    height: 36px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

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

.icon-btn {
    background: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.icon-btn.danger:hover {
    color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.1);
}

.icon-btn.success:hover {
    color: var(--success-color);
    background-color: rgba(16, 185, 129, 0.1);
}

.icon-btn.primary:hover {
    color: var(--accent-color);
    background-color: rgba(59, 130, 246, 0.1);
}


/* Table Setup */
.table-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    /* Material Tables typically use low elevation */
    overflow-x: auto;
    /* Enable horizontal scroll on narrow screens */
    -webkit-overflow-scrolling: touch;
    /* Smooth scrolling on iOS */
}

table {
    width: 100%;
    min-width: 700px;
    /* Force scrolling if screen is too narrow */
    border-collapse: collapse;
    text-align: left;
}

th,
td {
    padding: 1rem 1.5rem;
}

th {
    background-color: rgba(0, 0, 0, 0.2);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}

td {
    border-bottom: 1px solid var(--border-color);
    font-size: 1rem;
}

tr:last-child td {
    border-bottom: none;
}

tbody tr {
    transition: background-color var(--transition-fast);
}

tbody tr:hover:not(#empty-state-row) {
    background-color: rgba(255, 255, 255, 0.03);
}

.actions-cell {
    display: flex;
    gap: 0.25rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    color: var(--text-muted);
}

/* Modal Overlay & Animations */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: all var(--transition-norm);
}

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

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: scale(1) translateY(0);
    transition: transform var(--transition-norm) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.hidden .modal-content {
    transform: scale(0.95) translateY(20px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
    overflow-y: auto;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    background-color: rgba(51, 65, 85, 0.8);
}

.dimensions-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

/* Base Modal Overrides for Config */
.config-modal-content {
    max-width: 600px;
}

.config-body {
    display: block;
    /* Override default grid */
}

.config-section {
    background-color: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.config-section:last-child {
    margin-bottom: 0;
}

.config-section h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--accent-color);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.5rem;
}

.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.readonly-input {
    background-color: var(--bg-secondary) !important;
    color: var(--text-muted) !important;
    cursor: not-allowed;
    border: 1px dashed var(--border-color) !important;
}

/* Materials Cost Styling */
.materials-header-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1rem;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
}

.material-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.75rem;
}

.material-row label {
    margin-bottom: 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.material-row input {
    padding: 0.5rem;
}

.material-label-col {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mat-select {
    width: 100px;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    font-family: var(--font-main);
    cursor: pointer;
}

.mat-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* 3D Preview Container */
.preview-container {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

.preview-container h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 500;
}

#threejs-canvas-subcontainer {
    flex-grow: 1;
    min-height: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: #1a2335;
    position: relative;
    cursor: grab;
}

#threejs-canvas-subcontainer:active {
    cursor: grabbing;
}

.modal-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    z-index: 10;
}

/* Master Mix Output Styling */
.master-mix-section {
    margin-top: 2rem;
    animation: fadeIn 0.4s ease;
}

.master-mix-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
}

.master-mix-card h2 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.mix-summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.stat-box {
    background-color: var(--bg-primary);
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-box.highlight {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(37, 99, 235, 0.2) 100%);
    border-color: rgba(59, 130, 246, 0.3);
}

.stat-box.highlight .stat-value {
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }

    .modal-body {
        grid-template-columns: 1fr;
    }

    .config-grid,
    .dimensions-group {
        grid-template-columns: 1fr;
    }

    /* Stack materials header on mobile */
    .materials-header-grid {
        display: none;
        /* Hide header row on vertical mobile stack */
    }

    .material-row {
        grid-template-columns: 1fr;
        background-color: var(--bg-primary);
        padding: 1rem;
        border-radius: var(--radius-md);
        border: 1px solid var(--border-color);
        gap: 0.5rem;
    }

    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}

/* Print Styles for Recipes Export */
@media print {

    /* Reset colors and backgrounds for ink savings */
    body {
        background-color: white !important;
        color: black !important;
    }

    * {
        color: black !important;
        background: transparent !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    /* Hide Navigation, Master Mix, Modals, and the primary Items table */
    .app-header,
    .items-section,
    .master-mix-section,
    .modal-overlay,
    .btn,
    button,
    .actions-cell {
        display: none !important;
    }

    /* Ensure the Recipes section is visible and uses full space */
    .recipes-section {
        display: block !important;
        margin: 0 !important;
        padding: 0 !important;
        visibility: visible !important;
        width: 100% !important;
    }

    /* Format Card borders for paper */
    .card {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }

    .card-header h2 {
        border-bottom: 2px solid #ccc;
        padding-bottom: 15px;
        margin-bottom: 20px;
    }

    /* Format table rules for physical paper */
    table {
        border-collapse: collapse;
        width: 100%;
        margin-bottom: 20px;
        page-break-inside: auto;
    }

    tr {
        page-break-inside: avoid;
        page-break-after: auto;
    }

    th,
    td {
        border: 1px solid #ddd !important;
        padding: 8px 12px !important;
        text-align: left;
    }

    th {
        font-weight: bold;
        background-color: #f8f9fa !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    /* Make text legible but smaller on paper */
    body,
    table,
    th,
    td {
        font-size: 12pt !important;
    }

    /* Page specific printing overrides */
    @page {
        margin: 1.5cm;
        size: auto;
    }
}