/**
 * 대산 Ai V4 - Modern Glassmorphism Design System
 * Responsive: PC / Tablet / Mobile
 * Brand: #48BB78 (Primary Green), #123628 (Dark Green)
 */

/* ===== CSS Variables (Design Tokens) ===== */
:root {
    /* Brand Colors */
    --color-primary: #48BB78;
    --color-primary-dark: #123628;
    --color-primary-light: #F0FFF4;
    --color-primary-hover: #38A169;
    --color-secondary: #0a2318;
    --color-success: #4CAF50;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    --color-danger-dark: #DC2626;

    /* Neutrals */
    --color-white: #FFFFFF;
    --color-bg: #F1F5F0;
    --color-bg-subtle: #F8FAF8;
    --color-surface: #FFFFFF;
    --color-border: #D1E7D5;
    --color-border-light: #E8F5E9;
    --color-text: #1A2E1A;
    --color-text-secondary: #4A6B4A;
    --color-text-muted: #8CA68C;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-bg-heavy: rgba(255, 255, 255, 0.88);
    --glass-border: rgba(255, 255, 255, 0.45);
    --glass-blur: 16px;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #48BB78 0%, #2D7A4F 50%, #123628 100%);
    --gradient-header: linear-gradient(135deg, #123628 0%, #1A4A35 100%);
    --gradient-cta: linear-gradient(135deg, #48BB78 0%, #38A169 100%);
    --gradient-surface: linear-gradient(180deg, rgba(72,187,120,0.04) 0%, rgba(255,255,255,0) 100%);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 24px;
    --space-3xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(18, 54, 40, 0.06), 0 1px 2px rgba(18, 54, 40, 0.04);
    --shadow-md: 0 4px 12px rgba(18, 54, 40, 0.08), 0 2px 4px rgba(18, 54, 40, 0.04);
    --shadow-lg: 0 8px 24px rgba(18, 54, 40, 0.1), 0 4px 8px rgba(18, 54, 40, 0.04);
    --shadow-xl: 0 16px 48px rgba(18, 54, 40, 0.12), 0 8px 16px rgba(18, 54, 40, 0.06);
    --shadow-glow: 0 0 20px rgba(72, 187, 120, 0.25);
    --shadow-glow-strong: 0 0 30px rgba(72, 187, 120, 0.35);
    --shadow-inset: inset 0 1px 2px rgba(18, 54, 40, 0.06);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --header-height: 64px;
    --panel-left-width: 360px;
    --panel-right-width: 320px;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(72, 187, 120, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(18, 54, 40, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 60% 80%, rgba(72, 187, 120, 0.03) 0%, transparent 50%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--color-text);
    line-height: 1.6;
    font-size: 14px;
}

/* ===== Header ===== */
.header {
    background: var(--gradient-header);
    padding: 0 var(--space-2xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    border-bottom: 1px solid rgba(72, 187, 120, 0.2);
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.15);
}

.header h1 {
    font-size: 20px;
    color: var(--color-white);
    font-weight: 700;
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.header h1::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(72, 187, 120, 0.6);
}

.header-buttons {
    display: flex;
    gap: var(--space-sm);
}

/* ===== Buttons ===== */
.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    letter-spacing: -0.1px;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 60%);
    pointer-events: none;
}

.btn-primary {
    background: var(--gradient-cta);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
    filter: brightness(1.05);
}

.btn-primary:active {
    transform: translateY(0);
    filter: brightness(0.95);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Header secondary buttons - light style */
.header .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.header .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.18);
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.3);
}

.header .btn-primary {
    background: var(--color-primary);
    box-shadow: 0 0 12px rgba(72, 187, 120, 0.3);
}

.header .btn-primary:hover {
    box-shadow: var(--shadow-glow-strong);
}

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

.btn-danger:hover {
    background: var(--color-danger-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-sm {
    padding: 5px var(--space-md);
    font-size: 12px;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 15px;
}

.btn-full {
    width: 100%;
}

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

.btn-gradient:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    filter: grayscale(0.3);
    box-shadow: none !important;
}

/* ===== Main Container - 3 Column Layout ===== */
.container {
    display: flex;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* Left Panel - Input */
.left-panel {
    width: var(--panel-left-width);
    background: var(--color-surface);
    overflow-y: auto;
    padding: var(--space-xl);
    flex-shrink: 0;
    border-right: 1px solid var(--color-border-light);
}

/* Center Panel - Preview */
.center-panel {
    flex: 1;
    background: var(--color-bg);
    background-image:
        radial-gradient(circle at 50% 30%, rgba(72, 187, 120, 0.04) 0%, transparent 60%);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: auto;
}

/* Right Panel - Results */
.right-panel {
    width: var(--panel-right-width);
    background: var(--color-surface);
    overflow-y: auto;
    padding: var(--space-xl);
    flex-shrink: 0;
    border-left: 1px solid var(--color-border-light);
}

/* ===== Section ===== */
.section {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

.section:hover {
    box-shadow: var(--shadow-md);
}

.section-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.section-title::before {
    content: '';
    width: 3px;
    height: 16px;
    background: var(--gradient-cta);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 5px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.form-row {
    display: flex;
    gap: var(--space-md);
}

.form-row .form-group {
    flex: 1;
}

input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 9px var(--space-md);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-bg-subtle);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-inset);
}

input[type="number"]:hover,
input[type="text"]:hover,
select:hover {
    border-color: var(--color-primary);
    background: var(--color-white);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.12), var(--shadow-inset);
}

input.error {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.error-message {
    color: var(--color-danger);
    font-size: 11px;
    margin-top: var(--space-xs);
    font-weight: 500;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
    border-radius: var(--radius-sm);
}

.checkbox-group label {
    margin: 0;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    user-select: none;
}

/* ===== Parts Table ===== */
.parts-table-container {
    margin-top: var(--space-md);
    max-height: 350px;
    overflow-y: auto;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-white);
}

.parts-table {
    width: 100%;
    border-collapse: collapse;
}

.parts-table thead {
    background: var(--color-primary-dark);
    color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 10;
}

.parts-table th {
    padding: 10px var(--space-sm);
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.parts-table td {
    padding: 10px var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
    text-align: right;
    font-size: 13px;
    color: var(--color-text);
}

.parts-table td:first-child,
.parts-table td:nth-child(5),
.parts-table td:last-child {
    text-align: center;
}

.parts-table tbody tr {
    transition: background var(--transition-fast);
}

.parts-table tbody tr:nth-child(even) {
    background: var(--color-bg-subtle);
}

.parts-table tbody tr:hover {
    background: rgba(72, 187, 120, 0.06);
}

.parts-table input {
    width: 100%;
    padding: var(--space-xs);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 13px;
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.parts-table input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(72, 187, 120, 0.1);
}

.parts-table .editable-cell {
    cursor: text;
    padding: var(--space-sm);
}

.parts-table .editable-cell:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    background: var(--color-primary-light);
}

.delete-btn {
    background: none;
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

.empty-row td {
    padding: var(--space-2xl);
    color: var(--color-text-muted);
    text-align: center !important;
    font-style: italic;
}

/* ===== Calculate Button ===== */
.calculate-btn {
    width: 100%;
    padding: 14px var(--space-lg);
    background: var(--gradient-cta);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    margin-top: var(--space-xl);
    transition: all var(--transition-normal);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.calculate-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong), var(--shadow-lg);
    filter: brightness(1.05);
}

.calculate-btn:active {
    transform: translateY(0);
    filter: brightness(0.95);
}

.calculate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    filter: grayscale(0.3);
}

/* ===== Canvas Area ===== */
.canvas-container {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--space-xl);
    width: 100%;
    max-width: 800px;
    border: 1px solid var(--color-border-light);
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-subtle);
}

#previewCanvas {
    display: block;
    width: 100%;
    height: auto;
}

.canvas-controls {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--space-lg);
}

.canvas-controls-top {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    max-width: 800px;
}

/* ===== Result Cards ===== */
.result-card {
    background: var(--gradient-header);
    color: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(72, 187, 120, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.result-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.result-label {
    font-size: 12px;
    opacity: 0.75;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.result-value {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ===== Summary Items ===== */
.summary-item {
    background: var(--color-bg-subtle);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
}

.summary-item:hover {
    border-color: var(--color-border);
    background: var(--color-white);
}

.summary-label {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.summary-value {
    font-weight: 700;
    color: var(--color-text);
}

/* Label Groups */
.label-group-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    background: var(--color-bg-subtle);
    margin-bottom: var(--space-xs);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
}

.label-group-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.label-badge {
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: 3px var(--space-sm);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 11px;
    min-width: 26px;
    text-align: center;
    letter-spacing: 0.3px;
}

.label-size {
    flex: 1;
    font-size: 13px;
    color: var(--color-text);
}

.label-count {
    font-weight: 700;
    color: var(--color-primary-dark);
    font-size: 13px;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
    color: var(--color-text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.empty-state-illustration {
    margin-bottom: var(--space-sm);
    opacity: 0.75;
    animation: empty-state-float 4s ease-in-out infinite;
}

@keyframes empty-state-float {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-8px); }
}

@media (prefers-reduced-motion: reduce) {
    .empty-state-illustration { animation: none; }
}

.empty-state-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: -0.2px;
}

.empty-state-text {
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ===== Tips Section ===== */
.tips-list {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.tips-list p {
    margin-bottom: var(--space-sm);
}

/* ===== Accordion ===== */
.accordion {
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-white);
    transition: box-shadow var(--transition-normal);
}

.accordion:hover {
    box-shadow: var(--shadow-sm);
}

.accordion-header {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-subtle);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    user-select: none;
}

.accordion-header:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.accordion-icon {
    transition: transform var(--transition-normal);
    font-size: 10px;
    opacity: 0.6;
}

.accordion.open .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-slow);
}

.accordion.open .accordion-body {
    padding: var(--space-lg);
    max-height: 500px;
}

/* ===== Share Dropdown ===== */
.share-dropdown {
    position: relative;
    display: inline-block;
}

.share-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 160px;
    z-index: 200;
    overflow: hidden;
    padding: var(--space-xs);
}

.share-dropdown-menu.show {
    display: block;
    animation: dropdownIn 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes dropdownIn {
    from {
        opacity: 0;
        transform: translateY(-6px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.share-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: none;
    background: none;
    text-align: left;
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    color: var(--color-text);
}

.share-option:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.share-option:active {
    background: var(--color-border);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

/* ===== Utilities ===== */
.hidden {
    display: none !important;
}

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

/* ===== Mobile Navigation ===== */
.mobile-nav {
    display: none;
    background: var(--color-white);
    padding: var(--space-sm) var(--space-md);
    position: sticky;
    top: var(--header-height);
    z-index: 50;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
}

.mobile-nav-tabs {
    display: flex;
    gap: var(--space-xs);
    background: var(--color-bg);
    padding: 3px;
    border-radius: var(--radius-md);
}

.mobile-nav-tab {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-muted);
}

.mobile-nav-tab:hover {
    color: var(--color-text);
}

.mobile-nav-tab.active {
    background: var(--color-white);
    color: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
}

/* ===== Responsive: Large Desktop ===== */
@media (min-width: 1440px) {
    :root {
        --panel-left-width: 380px;
        --panel-right-width: 340px;
    }
}

/* ===== Responsive: Tablet (768px - 1023px) ===== */
@media (max-width: 1200px) {
    :root {
        --panel-left-width: 300px;
        --panel-right-width: 280px;
    }
}

@media (max-width: 1023px) {
    .container {
        flex-direction: column;
        height: auto;
        min-height: calc(100vh - var(--header-height));
    }

    .left-panel,
    .center-panel,
    .right-panel {
        width: 100%;
        max-width: 100%;
        border-left: none;
        border-right: none;
    }

    .mobile-nav {
        display: block;
    }

    .left-panel,
    .right-panel {
        display: none;
    }

    .left-panel.active,
    .center-panel.active,
    .right-panel.active {
        display: block;
    }

    .center-panel {
        display: none;
        min-height: calc(100vh - var(--header-height) - 52px);
    }

    .header h1 {
        font-size: 16px;
    }

    .header-buttons {
        gap: var(--space-xs);
    }

    .header-buttons .btn {
        padding: 6px var(--space-sm);
        font-size: 12px;
    }

    .header-buttons .btn-text {
        display: none;
    }
}

/* ===== Responsive: Mobile (< 768px) ===== */
@media (max-width: 767px) {
    :root {
        --header-height: 52px;
    }

    body {
        font-size: 13px;
    }

    .header {
        padding: 0 var(--space-md);
    }

    .header h1 {
        font-size: 15px;
    }

    .section {
        padding: var(--space-lg);
        margin-bottom: var(--space-md);
        border-radius: var(--radius-lg);
    }

    .left-panel,
    .center-panel,
    .right-panel {
        padding: var(--space-md);
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .parts-table-container {
        max-height: 250px;
    }

    .parts-table th,
    .parts-table td {
        padding: var(--space-sm) var(--space-xs);
        font-size: 12px;
    }

    .canvas-controls {
        flex-direction: column;
    }

    .canvas-controls .btn {
        width: 100%;
    }

    .result-value {
        font-size: 18px;
    }

    .mobile-nav-tab {
        font-size: 12px;
        padding: 7px var(--space-xs);
    }

    .calculate-btn {
        padding: 12px var(--space-lg);
        font-size: 14px;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        background: white;
        background-image: none;
    }

    .header,
    .mobile-nav,
    .left-panel,
    .right-panel,
    .canvas-controls {
        display: none !important;
    }

    .center-panel {
        display: block !important;
        width: 100%;
        padding: 0;
    }

    .canvas-container {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* ===== Component-Specific Classes ===== */

/* Trim Option Row */
.trim-row {
    margin-top: var(--space-md);
    align-items: center;
}

.trim-checkbox {
    flex: 1;
    margin-bottom: 0;
}

.trim-margin-group {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.trim-label {
    margin-bottom: 0 !important;
    white-space: nowrap;
}

.trim-input {
    width: 70px !important;
    flex-shrink: 0;
}

.trim-unit {
    font-size: 12px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

/* Part Actions Row */
.part-actions-row {
    align-items: center;
}

.part-rotate-check {
    flex: 1;
}

.part-add-btn {
    flex: 1;
}

/* Accordion Section (no padding) */
.section-accordion {
    padding: 0;
    overflow: hidden;
}

/* Cost Display */
.cost-display {
    padding: 10px var(--space-md);
    background: var(--color-bg-subtle);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    font-weight: 600;
    color: var(--color-primary-dark);
}

.cost-hint {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    line-height: 1.5;
}

/* Canvas Controls Top */
.canvas-controls-top {
    margin-bottom: var(--space-lg);
}

/* Canvas Scroll Container */
.canvas-scroll-container {
    width: 100%;
    max-width: 800px;
    overflow-y: auto;
    max-height: calc(100vh - 200px);
}

/* Empty State Padded */
.empty-state-padded {
    padding: var(--space-xl);
}

/* ===== Selection Color ===== */
::selection {
    background: rgba(72, 187, 120, 0.2);
    color: var(--color-primary-dark);
}