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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent: #4a9eff;
    --accent-hover: #3a8eef;
    --danger: #ff4a4a;
    --danger-hover: #ef3a3a;
    --success: #4aff4a;
    --border: #4d4d4d;
    --warning: #ffaa00;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 14px;
    transition: background-color 0.2s, color 0.2s;
}

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

.btn-icon.danger:hover {
    background-color: var(--danger);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    background-color: var(--bg-primary);
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    padding: 40px;
    text-align: center;
}

.welcome-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.welcome-header h1 {
    font-size: 24px;
    margin: 0;
}

.design-card-new {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    border: 2px dashed var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 250px;
    cursor: pointer;
    transition: all 0.2s;
}

.design-card-new:hover {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    box-shadow: 0 8px 16px rgba(74, 158, 255, 0.2);
}

.design-card-new-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.design-card-new-icon {
    font-size: 48px;
    color: var(--text-secondary);
    font-weight: 300;
}

.design-card-new:hover .design-card-new-icon {
    color: white;
    font-size: 56px;
}

.design-card-new-text {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-secondary);
}

.design-card-new:hover .design-card-new-text {
    color: white;
    font-size: 26px;
}

.welcome-screen h1 {
    font-size: 48px;
    margin-bottom: 16px;
}

.welcome-screen p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Designs Grid */
.designs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 1200px;
}

.design-card {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
}

.design-card-image-wrapper {
    background-color: white;
    padding: 8px;
    border-radius: 12px 12px 0 0;
}

.design-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    border-color: var(--accent);
}

.design-card-image {
    width: 100%;
    height: 256px;
    object-fit: contain;
    flex-shrink: 0;
}

.design-card-content {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.design-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.design-card-actions {
    display: flex;
    gap: 8px;
    margin-top: auto;
}

.design-card-btn {
    flex: 1;
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s, color 0.2s;
}

.design-card-btn:hover {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
}

.design-card-btn.delete-btn:hover {
    background-color: var(--danger);
    border-color: var(--danger);
}

/* Isometric Toolbar */
.isometric-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.isometric-toolbar .btn-icon {
    padding: 10px 16px;
    font-size: 18px;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.isometric-toolbar .btn-icon:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: white;
}

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

/* Calculator View */
.calculator-view {
    padding: 20px;
}

.calculator-view.hidden {
    display: none;
}

.calculator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    gap: 20px;
}

.design-name-input {
    flex: 1;
    padding: 12px 16px;
    font-size: 24px;
    font-weight: 600;
    background-color: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.design-name-input:focus {
    outline: none;
    border-color: var(--accent);
}

.calculator-actions {
    display: flex;
    gap: 12px;
}

.calculator-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
}

/* Parameters Panel */
.parameters-panel {
    background-color: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
}

.parameters-panel .canvas-container.isometric {
    margin-top: 12px;
    padding: 0px;
    grid-column: auto;
}

.parameters-toolbar {
    display: none;
}

.parameters-header {
    margin-bottom: 0px;
}

.parameters-panel h3 {
    margin: 0;
    font-size: 20px;
}

.form-section {
    margin-bottom: 16px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.form-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
}

.form-section.collapsible .form-section-title {
    cursor: pointer;
    user-select: none;
}

.form-section.collapsible .form-section-title:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.collapse-icon {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.form-section.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.form-section-content {
    max-height: 500px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 1;
    padding: 16px;
}

.form-section.collapsed .form-section-content {
    max-height: 0;
    opacity: 0;
    padding: 0;
}

.material-summary,
.box-summary,
.lid-summary {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 0;
    margin: 0;
    white-space: nowrap;
}

.form-section.collapsed .material-summary,
.form-section.collapsed .box-summary,
.form-section.collapsed .lid-summary {
    max-height: 100px;
    opacity: 1;
    padding: 6px 0 6px 12px;
    margin: 0 0 0px 0;
}

.form-group {
    margin-bottom: 10px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.calculator-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.calculator-buttons button {
    flex: 1;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    font-size: 20px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    flex-shrink: 0;
}

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

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

.btn-icon:disabled:hover {
    background-color: transparent;
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

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

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

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

.btn-secondary:hover {
    background-color: #4d4d4d;
}

/* Pattern Info */
.pattern-info {
    margin-top: 16px;
    padding: 16px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.8;
}

.pattern-info p {
    margin: 8px 0;
}

.pattern-info .warning {
    color: var(--warning);
    font-weight: 600;
}

.pattern-info .success {
    color: var(--success);
}

/* Canvas Panel */
.canvas-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.patterns-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.pattern-column {
    display: flex;
    flex-direction: column;
    background-color: white;
}

.pattern-column:not(:last-child) {
    border-right: 1px solid var(--border);
}

.pattern-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-secondary);
}

.pattern-header .pattern-info {
    margin-top: 12px;
    padding: 0;
    background-color: transparent;
    border-radius: 0;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.pattern-header .pattern-info p {
    margin: 0;
    white-space: nowrap;
}

.canvas-container {
    background-color: var(--bg-secondary);
    padding: 0;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.pattern-header h4 {
    margin-bottom: 8px;
    font-size: 16px;
    color: var(--text-secondary);
}

.canvas-container canvas {
    width: auto;
    height: auto;
    background-color: white;
    border-radius: 0;
    padding: 20px;
    box-sizing: border-box;
    display: block;
    margin: 0 auto;
}

.canvas-panel > .patterns-grid canvas {
    width: auto;
    height: auto;
    background-color: white;
    border-radius: 0;
    padding: 20px;
    box-sizing: border-box;
    display: block;
    margin: 0 auto;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        display: none;
    }

    .calculator-content {
        grid-template-columns: 1fr;
    }

    .calculator-header {
        flex-direction: column;
        align-items: stretch;
    }

    .calculator-actions {
        width: 100%;
    }

    .calculator-actions button {
        flex: 1;
    }

    .patterns-grid {
        grid-template-columns: 1fr;
    }

    .pattern-column:not(:last-child) {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .welcome-screen h1 {
        font-size: 32px;
    }
}

/* Hidden class */
.hidden {
    display: none !important;
}

/* Notification System */
.notification-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
    align-items: center;
}

.notification {
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    padding: 16px 20px;
    min-width: 300px;
    max-width: 400px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.3s ease;
    pointer-events: auto;
}

.notification.show {
    opacity: 1;
    transform: translateY(0);
}

.notification-icon {
    font-size: 20px;
    font-weight: bold;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}

.notification-message {
    flex: 1;
    font-size: 14px;
    line-height: 1.4;
}

.notification-success {
    border-left-color: var(--success);
}

.notification-success .notification-icon {
    background-color: var(--success);
    color: var(--bg-primary);
}

.notification-error {
    border-left-color: var(--danger);
}

.notification-error .notification-icon {
    background-color: var(--danger);
    color: white;
}

.notification-warning {
    border-left-color: var(--warning);
}

.notification-warning .notification-icon {
    background-color: var(--warning);
    color: var(--bg-primary);
}

.notification-info {
    border-left-color: var(--accent);
}

.notification-info .notification-icon {
    background-color: var(--accent);
    color: white;
}

/* Confirm Dialog */
.confirm-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.confirm-overlay.show {
    opacity: 1;
}

.confirm-dialog {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 24px;
    min-width: 400px;
    max-width: 500px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.confirm-overlay.show .confirm-dialog {
    transform: scale(1);
}

.confirm-message {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.confirm-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.confirm-actions button {
    min-width: 80px;
}

@media (max-width: 768px) {
    .welcome-screen {
        padding: 20px;
    }

    .welcome-screen h1 {
        font-size: 24px;
        margin-bottom: 8px;
    }

    .welcome-screen p {
        font-size: 14px;
        margin-bottom: 20px;
    }

    .design-card.new {
        min-height: auto;
        flex-direction: row;
        font-size: 24px;
        gap: 8px;
        padding: 6px 10px;
        align-items: center;
        justify-content: center;
    }

    .design-card.new > div:first-child {
        font-size: 28px;
        line-height: 1;
        margin-top: -10px;
    }

    .notification-container {
        bottom: 10px;
        left: 10px;
        right: 10px;
        transform: none;
    }

    .notification {
        min-width: auto;
        max-width: none;
        width: 100%;
    }

    .confirm-dialog {
        min-width: auto;
        max-width: none;
        margin: 20px;
    }
}