/* Conveyor Speed Calculator Styles */

/* CSS Custom Properties */
:root {
    --conveyor-speed-primary: #0ea5e9;
    --conveyor-speed-secondary: #0284c7;
    --conveyor-speed-accent: #06b6d4;
    --conveyor-speed-light: #e0f2fe;
    --conveyor-speed-dark: #0c4a6e;
    --conveyor-speed-gradient: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    --conveyor-speed-gradient-hover: linear-gradient(135deg, #0284c7 0%, #0891b2 100%);
    
    /* Base colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Status colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

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

html {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--conveyor-speed-light) 100%);
    min-height: 100vh;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    font-optical-sizing: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--gray-200);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--conveyor-speed-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.logo:hover {
    color: var(--conveyor-speed-secondary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
}

.nav-link:hover {
    color: var(--conveyor-speed-primary);
    background: var(--gray-50);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    background: var(--white);
    box-shadow: var(--shadow-md);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 99;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-link {
    display: block;
    padding: 1rem;
    color: var(--gray-700);
    text-decoration: none;
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-fast);
}

.mobile-menu-link:hover {
    background: var(--gray-50);
    color: var(--conveyor-speed-primary);
}

/* Breadcrumb */
.breadcrumb {
    background: var(--gray-50);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.breadcrumb ol {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.875rem;
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb a {
    color: var(--conveyor-speed-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    transition: var(--transition-fast);
}

.breadcrumb a:hover {
    background: var(--conveyor-speed-light);
    color: var(--conveyor-speed-dark);
}

.breadcrumb li:not(:last-child)::after {
    content: '/';
    margin-left: 0.5rem;
    color: var(--gray-400);
}

.breadcrumb span {
    color: var(--gray-600);
    font-weight: 600;
}

/* Breadcrumb Navigation */
.breadcrumb {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 0.75rem 0;
    font-size: 0.875rem;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    color: var(--gray-400);
    margin-left: 0.5rem;
    font-weight: 400;
}

.breadcrumb-link {
    color: var(--gray-600);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: var(--transition-fast);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
}

.breadcrumb-link:hover {
    color: var(--conveyor-speed-primary);
    background: var(--gray-50);
}

.breadcrumb-item.active span {
    color: var(--gray-900);
    font-weight: 500;
}

.breadcrumb-link i {
    font-size: 0.75rem;
}

/* Inline Links */
.inline-link {
    color: var(--conveyor-speed-primary);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: var(--transition-fast);
}

.inline-link:hover {
    border-bottom-color: var(--conveyor-speed-primary);
    color: var(--conveyor-speed-dark);
}

/* Hero Header Section */
.hero {
    background: linear-gradient(135deg, var(--white) 0%, var(--conveyor-speed-light) 100%);
    color: var(--gray-900);
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--gray-200);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--conveyor-speed-light);
    color: var(--conveyor-speed-dark);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid var(--conveyor-speed-primary);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.025em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 900px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
    font-weight: 400;
}

.hero-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.875rem;
}

.feature-item i {
    color: var(--conveyor-speed-primary);
    font-size: 1rem;
}

/* Statistics Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 500;
}

/* Calculator Section */
.calculator-section {
    padding: 4rem 0;
}

.calculator-container {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    min-width: 150px;
    padding: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--gray-600);
}

.tab-btn:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.tab-btn.active {
    background: var(--conveyor-speed-primary);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.tab-btn i {
    font-size: 1.1rem;
}

.tab-text {
    font-size: 0.875rem;
}

/* Tab Content */
.tab-content {
    padding: 2rem;
}

.tab-pane {
    display: none;
}

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

/* Form Styles */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-control {
    padding: 0.75rem;
    border: 2px solid var(--gray-300);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: var(--transition-fast);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--conveyor-speed-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-control:hover {
    border-color: var(--gray-400);
}

/* Slider Styles */
.slider-container {
    position: relative;
    margin-top: 0.5rem;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-300);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--conveyor-speed-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--conveyor-speed-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-size: 0.875rem;
}

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

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

.btn-secondary {
    background: var(--gray-600);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--gray-700);
    transform: translateY(-1px);
}

.btn-export {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-export:hover {
    background: var(--gray-200);
    border-color: var(--gray-400);
}

.btn-template {
    background: linear-gradient(135deg, var(--conveyor-speed-light) 0%, var(--white) 100%);
    color: var(--conveyor-speed-dark);
    border: 2px solid var(--conveyor-speed-primary);
    font-weight: 600;
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-template::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s;
}

.btn-template:hover::before {
    left: 100%;
}

.btn-template:hover {
    background: var(--conveyor-speed-primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 15px -3px rgba(59, 130, 246, 0.4);
}

/* Calculate Button Section */
.calculate-section {
    margin-top: 3rem;
    padding: 2.5rem 2rem;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    border-radius: 1rem;
    border: 1px solid var(--gray-200);
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.btn-calculate {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: 0.75rem;
    box-shadow: 0 8px 15px -3px rgba(59, 130, 246, 0.3);
    min-width: 280px;
    letter-spacing: 0.025em;
    position: relative;
    overflow: hidden;
}

.btn-calculate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-calculate:hover::before {
    left: 100%;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -3px rgba(59, 130, 246, 0.4);
}

.calculate-help {
    margin-top: 1rem;
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 0;
    font-weight: 500;
}

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.btn-accept {
    background: var(--success);
    color: var(--white);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-accept:hover {
    background: #059669;
}

/* Results Styles */
.results-container {
    max-width: none;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gray-200);
}

.results-header h3 {
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: 700;
}

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

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.result-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.result-header {
    background: var(--conveyor-speed-gradient);
    color: var(--white);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-header h4 {
    font-size: 1.1rem;
    font-weight: 600;
}

.result-header i {
    font-size: 1.25rem;
    opacity: 0.9;
}

.result-content {
    padding: 1.5rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-100);
}

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

.result-label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.result-value {
    font-weight: 700;
    color: var(--conveyor-speed-primary);
    font-size: 1rem;
}

/* Export Section */
.export-section {
    background: var(--gray-50);
    border-radius: 0.75rem;
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
}

.export-section h4 {
    margin-bottom: 1rem;
    color: var(--gray-800);
    font-weight: 600;
}

.export-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Charts Styles */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.chart-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.chart-card h4 {
    margin-bottom: 1rem;
    color: var(--gray-800);
    font-weight: 600;
    text-align: center;
}

.chart-card canvas {
    max-height: 300px;
}

/* Templates Styles */
.templates-container h3 {
    margin-bottom: 2rem;
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.template-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.template-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--conveyor-speed-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.template-card:hover {
    box-shadow: 0 12px 25px -5px rgba(0, 0, 0, 0.15);
    transform: translateY(-5px);
    border-color: var(--conveyor-speed-primary);
}

.template-card:hover::before {
    transform: scaleX(1);
}

.template-header {
    background: linear-gradient(135deg, var(--conveyor-speed-primary) 0%, var(--conveyor-speed-dark) 100%);
    color: var(--white);
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.template-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.template-header h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.025em;
}

.template-header i {
    font-size: 1.75rem;
    opacity: 0.9;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem;
    border-radius: 0.5rem;
    backdrop-filter: blur(10px);
}

.template-content {
    padding: 2rem;
}

.template-content p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    line-height: 1.6;
    font-weight: 500;
}

.template-content ul {
    list-style: none;
    margin-bottom: 2rem;
    padding: 0;
}

.template-content li {
    padding: 0.5rem 0;
    color: var(--gray-700);
    font-size: 0.875rem;
    position: relative;
    padding-left: 1.5rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.template-content li:hover {
    color: var(--conveyor-speed-primary);
    transform: translateX(3px);
}

.template-content li::before {
    content: "✓";
    color: var(--conveyor-speed-primary);
    font-weight: bold;
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--conveyor-speed-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

/* History Styles */
.history-container {
    max-width: none;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gray-200);
}

.history-header h3 {
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: 700;
}

.history-list {
    min-height: 200px;
}

.history-empty {
    text-align: center;
    padding: 3rem;
    color: var(--gray-500);
}

.history-empty i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.history-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.history-item:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--conveyor-speed-primary);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-item-title {
    font-weight: 600;
    color: var(--gray-800);
}

.history-item-date {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.history-item-summary {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.history-item-actions {
    display: flex;
    gap: 0.5rem;
}

.history-item-actions .btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

/* Section Styles */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-800);
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 3px;
    background: var(--conveyor-speed-gradient);
    border-radius: 2px;
}

/* How It Works Section */
.how-it-works {
    padding: 4rem 0;
    background: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step-card {
    text-align: center;
    padding: 2rem;
    border-radius: 1rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--conveyor-speed-primary);
}

.step-number {
    width: 4rem;
    height: 4rem;
    background: var(--conveyor-speed-gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-md);
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.step-content p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Use Cases Section */
.use-cases {
    padding: 3rem 0;
    background: var(--gray-50);
    margin-bottom: 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.use-case-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--gray-200);
}

.use-case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--conveyor-speed-primary);
}

.use-case-icon {
    width: 4rem;
    height: 4rem;
    background: var(--conveyor-speed-gradient);
    color: var(--white);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-sm);
}

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.use-case-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Related Calculators Section */
.related-calculators {
    padding: 4rem 0;
    background: var(--white);
}

.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.calculator-category {
    background: var(--gray-50);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.calculator-category:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--conveyor-speed-primary);
}

.category-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--gray-200);
}

.category-title i {
    color: var(--conveyor-speed-primary);
    font-size: 1.1rem;
}

.calculator-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.calculator-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--gray-700);
    transition: var(--transition-fast);
    font-weight: 500;
}

.calculator-link:hover {
    background: var(--conveyor-speed-light);
    border-color: var(--conveyor-speed-primary);
    color: var(--conveyor-speed-dark);
    transform: translateX(5px);
}

.calculator-link.popular {
    background: var(--conveyor-speed-light);
    border-color: var(--conveyor-speed-accent);
    color: var(--conveyor-speed-dark);
}

.calculator-link.current {
    background: var(--conveyor-speed-primary);
    border-color: var(--conveyor-speed-primary);
    color: var(--white);
}

.calculator-link i {
    font-size: 1rem;
    width: 1.25rem;
    text-align: center;
}

/* FAQ Section */
.faq {
    padding: 3rem 0;
    background: var(--gray-50);
    margin: 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.faq-question:hover {
    background: var(--gray-50);
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.faq-question i {
    color: var(--conveyor-speed-primary);
    transition: var(--transition-fast);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 200px;
}

.faq-answer p {
    color: var(--gray-600);
    line-height: 1.6;
    margin: 0;
}

/* Related Calculators Section */
.calculators-section {
    padding: 3rem 0;
    background: var(--white);
    margin: 0;
}

.calculators-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.calculator-category {
    background: var(--white);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.calculator-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    transition: all 0.3s ease;
}

.calculator-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px -5px rgba(0, 0, 0, 0.15);
}

.calculator-category.filling-sealing::before {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
}

.calculator-category.cartoning-boxing::before {
    background: linear-gradient(90deg, #10b981, #059669);
}

.calculator-category.wrapping-bundling::before {
    background: linear-gradient(90deg, #8b5cf6, #7c3aed);
}

.calculator-category.labeling-coding::before {
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.calculator-category.quality-control::before {
    background: linear-gradient(90deg, #ef4444, #dc2626);
}

.calculator-category.material-handling::before {
    background: linear-gradient(90deg, #6366f1, #4f46e5);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.category-icon {
    font-size: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--gray-100);
    border-radius: 0.75rem;
}

.category-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

.category-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.calculator-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: all 0.2s ease;
    border-radius: 0.25rem;
    position: relative;
    padding-left: 1rem;
}

.calculator-link:hover {
    color: var(--conveyor-speed-primary);
    transform: translateX(5px);
    background: var(--gray-50);
    padding-left: 1.5rem;
}

.calculator-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 2px;
    background: var(--conveyor-speed-primary);
    transition: width 0.2s ease;
}

.calculator-link:hover::before {
    width: 0.5rem;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--gray-300);
    padding: 1.5rem 0;
    margin-top: 0;
}

.footer-bottom {
    text-align: center;
    color: var(--gray-400);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-bottom a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition-fast);
    font-weight: 500;
}

.footer-bottom a:hover {
    color: var(--conveyor-speed-primary);
}

/* Notification */
.notification {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    max-width: 400px;
    z-index: 1000;
    transform: translateX(100%);
    transition: var(--transition);
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--success);
}

.notification.warning {
    border-left: 4px solid var(--warning);
}

.notification.error {
    border-left: 4px solid var(--error);
}

.notification.info {
    border-left: 4px solid var(--info);
}

.notification-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notification-message {
    color: var(--gray-800);
    font-weight: 500;
}

.notification-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0;
    margin-left: 1rem;
}

.notification-close:hover {
    color: var(--gray-700);
}

/* Privacy Banner */
.privacy-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--gray-800);
    color: var(--white);
    padding: 1rem;
    z-index: 1000;
    transform: translateY(100%);
    transition: var(--transition);
}

.privacy-banner.show {
    transform: translateY(0);
}

.privacy-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    gap: 1rem;
}

.privacy-content p {
    margin: 0;
    font-size: 0.875rem;
}

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

.privacy-link {
    color: var(--conveyor-speed-primary);
    text-decoration: none;
    font-size: 0.875rem;
}

.privacy-link:hover {
    text-decoration: underline;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--conveyor-speed-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }

    .breadcrumb {
        padding: 0.5rem 0;
        font-size: 0.8rem;
    }

    .breadcrumb-list {
        gap: 0.25rem;
    }

    .breadcrumb-link span {
        display: none;
    }

    .breadcrumb-item.active span {
        display: inline;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-features {
        flex-direction: column;
        gap: 1rem;
    }

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

    .calculate-section {
        margin-top: 2rem;
        padding: 1.5rem 1rem;
    }

    .btn-calculate {
        min-width: 200px;
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }



    .template-card {
        margin-bottom: 1.5rem;
    }

    .template-content {
        padding: 1.5rem;
    }

    .templates-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tab-navigation {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        min-width: 120px;
        padding: 0.75rem 0.5rem;
    }
    
    .tab-text {
        display: none;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .results-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .results-actions {
        justify-content: center;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-container {
        grid-template-columns: 1fr;
    }
    
    .templates-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .calculator-category {
        padding: 1.5rem;
    }

    .category-header {
        margin-bottom: 1rem;
    }

    .category-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.5rem;
    }

    .category-title {
        font-size: 1.125rem;
    }
    
    .export-buttons {
        justify-content: center;
    }
    
    .privacy-content {
        flex-direction: column;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .calculator-section {
        padding: 2rem 0;
    }
    
    .tab-content {
        padding: 1rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .step-card,
    .use-case-card {
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }
}

/* Small Mobile Devices */
@media (max-width: 480px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* Print Styles */
@media print {
    .header,
    .mobile-menu,
    .breadcrumb,
    .tab-navigation,
    .results-actions,
    .export-section,
    .footer,
    .notification,
    .privacy-banner {
        display: none !important;
    }
    
    .calculator-container {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
    
    .tab-pane {
        display: block !important;
    }
    
    .result-card {
        break-inside: avoid;
        margin-bottom: 1rem;
    }
    
    body {
        background: var(--white);
    }
    
    .hero {
        background: var(--white);
        color: var(--gray-800);
        border-bottom: 2px solid var(--gray-300);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #e5e5e5;
        --gray-200: #cccccc;
        --gray-300: #b3b3b3;
        --gray-600: #333333;
        --gray-700: #1a1a1a;
        --gray-800: #000000;
    }
    
    .form-control {
        border-width: 2px;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .loading::after {
        animation: none;
    }
}