/* Case Packing Calculator - Enterprise Grade Professional Styling */

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

:root {
    /* Enterprise Color Palette */
    --primary: #0066cc;
    --primary-dark: #004499;
    --primary-light: #3388dd;
    --primary-50: #e6f3ff;
    --primary-100: #b3d9ff;
    --primary-200: #80bfff;
    --primary-500: #0066cc;
    --primary-600: #0055aa;
    --primary-700: #004499;
    --primary-800: #003377;
    --primary-900: #002255;

    /* Secondary Colors */
    --secondary: #059669;
    --secondary-dark: #047857;
    --secondary-light: #10b981;
    --secondary-50: #ecfdf5;
    --secondary-100: #d1fae5;
    --secondary-200: #a7f3d0;

    /* Neutral Palette */
    --white: #ffffff;
    --gray-25: #fcfcfd;
    --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: #059669;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --error: #dc2626;
    --error-light: #fee2e2;
    --info: #0ea5e9;
    --info-light: #e0f2fe;

    /* Accent Colors */
    --blue: #2563eb;
    --purple: #7c3aed;
    --orange: #ea580c;
    --red: #dc2626;
    --indigo: #4f46e5;
    --teal: #0d9488;
    --pink: #ec4899;
    --cyan: #06b6d4;

    /* Enterprise Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Enterprise Borders */
    --border-radius-sm: 0.375rem;
    --border-radius: 0.5rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;

    /* Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Animation */
    --transition-fast: all 0.15s ease-out;
    --transition-base: all 0.2s ease-out;
    --transition-slow: all 0.3s ease-out;
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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-25) 0%, var(--primary-50) 100%);
    min-height: 100vh;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    font-optical-sizing: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enterprise Layout System */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* Enterprise Breadcrumb Navigation */
.breadcrumb {
    margin-bottom: var(--space-6);
    padding: var(--space-3) 0;
}

.breadcrumb ol {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.breadcrumb a {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius-sm);
}

.breadcrumb a:hover {
    color: var(--primary);
    background: var(--primary-50);
}

.breadcrumb span {
    color: var(--gray-400);
    font-weight: 400;
    user-select: none;
}

.breadcrumb li:last-child span {
    color: var(--gray-900);
    font-weight: 600;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-between {
    justify-content: space-between;
}

.justify-center {
    justify-content: center;
}

.space-x-6 > * + * {
    margin-left: 1.5rem;
}

.space-x-1 > * + * {
    margin-left: 0.25rem;
}

.space-x-3 > * + * {
    margin-left: 0.75rem;
}

.space-y-2 > * + * {
    margin-top: 0.5rem;
}

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

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

.hidden {
    display: none;
}

/* Grid System */
.grid {
    display: grid;
}

.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-cols-6 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.gap-2 {
    gap: 0.5rem;
}

.gap-3 {
    gap: 0.75rem;
}

.gap-4 {
    gap: 1rem;
}

.gap-6 {
    gap: 1.5rem;
}

.gap-8 {
    gap: 2rem;
}

/* Enterprise Card System */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-6);
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
    transform: translateY(-2px);
}

.card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--gray-25) 0%, var(--gray-50) 100%);
    position: relative;
}

.card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: 0;
    letter-spacing: -0.025em;
}

.card-title svg {
    color: var(--primary);
    flex-shrink: 0;
}

.card-content {
    padding: var(--space-6);
    background: var(--white);
}

/* Header */
.header {
    background: white;
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo:hover {
    color: var(--primary-green-dark);
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-green);
}

/* Enterprise Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--space-12);
    padding: var(--space-16) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(0, 102, 204, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    line-height: 1.1;
    letter-spacing: -0.025em;
    position: relative;
}

@media (min-width: 768px) {
    .hero h1 {
        font-size: 3.5rem;
    }
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto var(--space-8);
    line-height: 1.7;
    font-weight: 400;
}

/* Quick Navigation Pills */
.quick-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-8);
}

.quick-nav-item {
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-5);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-xl);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.quick-nav-item:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 640px) {
    .quick-nav {
        flex-direction: column;
        align-items: center;
    }

    .quick-nav-item {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

/* Enterprise Statistics Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.stat-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-8);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    display: block;
    filter: grayscale(0.2);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin: var(--space-2) 0;
    color: var(--primary);
    letter-spacing: -0.025em;
}

.stat-label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Enterprise Tab System */
.tabs-container {
    margin-bottom: var(--space-8);
}

.tabs-list {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-1);
    background: var(--gray-100);
    padding: var(--space-1);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--space-6);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-xs);
}

.tab-trigger {
    padding: var(--space-4) var(--space-3);
    border: none;
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-600);
    transition: var(--transition-base);
    font-size: var(--font-size-sm);
    position: relative;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tab-trigger:hover {
    background: var(--white);
    color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.tab-trigger.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    border: 1px solid var(--primary-200);
}

.tab-trigger.active::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

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

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Enterprise Form System */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

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

.label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    letter-spacing: 0.025em;
}

.input, .select {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    background: var(--white);
    font-family: inherit;
    box-shadow: var(--shadow-xs);
}

.input:focus, .select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1), var(--shadow-sm);
    transform: translateY(-1px);
}

.input:hover, .select:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.input::placeholder {
    color: var(--gray-400);
    font-weight: 400;
}

/* Enhanced Input States */
.input:invalid {
    border-color: var(--error);
}

.input:valid {
    border-color: var(--success);
}

/* Input Help Text */
.form-group small {
    margin-top: var(--space-1);
    color: var(--gray-500);
    font-size: var(--font-size-xs);
    line-height: 1.4;
}

/* Enterprise Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    font-family: inherit;
    letter-spacing: 0.025em;
    min-height: 48px;
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    color: var(--white);
    border-color: var(--secondary);
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--secondary-light) 0%, var(--secondary) 100%);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-lg);
    min-height: 56px;
}

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

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

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

/* Results Display */
.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.result-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Charts */
.chart-container {
    position: relative;
    height: 300px;
    margin: 1rem 0;
}

.chart-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    background: var(--gray-50);
    border: 2px dashed var(--gray-300);
    border-radius: 0.5rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* Enterprise Template Cards */
.template-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.template-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transform: scaleX(0);
    transition: var(--transition-base);
}

.template-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

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

.template-card.selected {
    border-color: var(--primary);
    background: var(--primary-50);
    box-shadow: var(--shadow-lg);
}

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

.template-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    display: block;
    filter: grayscale(0.3);
    transition: var(--transition-base);
}

.template-card:hover .template-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.template-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
    letter-spacing: -0.025em;
}

.template-description {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.template-badge {
    display: inline-block;
    background: var(--primary-100);
    color: var(--primary-700);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* History */
.history-item {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.history-item:hover {
    border-color: var(--primary-green);
    box-shadow: var(--shadow-md);
}

.history-date {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 0.25rem;
}

.history-params {
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.history-result {
    font-weight: 600;
    color: var(--primary-green);
}

/* Related Calculators */
.category-card {
    padding: 1.5rem;
    border-radius: 0.75rem;
    transition: var(--transition);
}

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

.category-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.category-dot {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.category-link {
    display: block;
    font-size: 0.875rem;
    text-decoration: none;
    transition: var(--transition);
    margin-bottom: 0.25rem;
    padding: 0.25rem 0;
}

.category-link:hover {
    text-decoration: underline;
    transform: translateX(5px);
}

/* Footer */
footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-link {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

.footer-link:hover {
    color: white;
}

/* Breadcrumbs */
.breadcrumb {
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: var(--gray-500);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--primary-green);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .tabs-list {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .form-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .tabs-list {
        grid-template-columns: repeat(2, 1fr);
    }

    .tab-trigger {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }

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

    .btn {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }

    .grid-cols-2 {
        grid-template-columns: 1fr;
    }

    .grid-cols-3 {
        grid-template-columns: 1fr;
    }

    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Mobile breadcrumb */
    .breadcrumb {
        font-size: 0.75rem;
        margin-bottom: 1rem;
    }

    /* Mobile quick navigation */
    .hero .flex {
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero .flex a {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .tabs-list {
        grid-template-columns: 1fr;
    }
    
    .tab-trigger {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .card-content {
        padding: 1rem;
    }
    
    .card-header {
        padding: 1rem;
    }
}

/* Utility Classes */
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-gray-400 { color: var(--gray-400); }
.text-gray-500 { color: var(--gray-500); }
.text-gray-600 { color: var(--gray-600); }
.text-gray-700 { color: var(--gray-700); }
.text-gray-800 { color: var(--gray-800); }
.text-gray-900 { color: var(--gray-900); }

.text-green-600 { color: var(--green-600); }
.text-green-700 { color: var(--green-700); }
.text-green-800 { color: var(--green-800); }
.text-green-900 { color: var(--green-900); }

.text-blue-600 { color: var(--blue-600); }
.text-purple-600 { color: var(--purple-600); }
.text-orange-600 { color: var(--orange-600); }
.text-red-600 { color: var(--red-600); }
.text-indigo-600 { color: var(--indigo-600); }
.text-teal-600 { color: var(--teal-600); }

.bg-white { background-color: white; }
.bg-gray-50 { background-color: var(--gray-50); }
.bg-gray-100 { background-color: var(--gray-100); }
.bg-gray-900 { background-color: var(--gray-900); }

.bg-green-50 { background-color: var(--green-50); }
.bg-blue-50 { background-color: #eff6ff; }
.bg-purple-50 { background-color: #faf5ff; }
.bg-orange-50 { background-color: #fff7ed; }
.bg-red-50 { background-color: #fef2f2; }

.border { border: 1px solid var(--gray-200); }
.border-gray-200 { border-color: var(--gray-200); }
.border-green-200 { border-color: var(--green-200); }
.border-blue-200 { border-color: #bfdbfe; }
.border-purple-200 { border-color: #e9d5ff; }
.border-orange-200 { border-color: #fed7aa; }
.border-red-200 { border-color: #fecaca; }

.rounded-lg { border-radius: 0.5rem; }
.rounded-full { border-radius: 9999px; }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }

.m-0 { margin: 0; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.ml-2 { margin-left: 0.5rem; }
.ml-4 { margin-left: 1rem; }
.mr-2 { margin-right: 0.5rem; }

.w-3 { width: 0.75rem; }
.w-4 { width: 1rem; }
.w-16 { width: 4rem; }
.w-full { width: 100%; }

.h-3 { height: 0.75rem; }
.h-4 { height: 1rem; }
.h-16 { height: 4rem; }

.fixed { position: fixed; }
.top-0 { top: 0; }
.left-0 { left: 0; }
.right-0 { right: 0; }

.z-50 { z-index: 50; }

.underline { text-decoration: underline; }

/* Additional utility classes */
.text-xs { font-size: 0.75rem; }
.text-4xl { font-size: 2.25rem; }

.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-12 { margin-bottom: 3rem; }

.max-w-4xl { max-width: 56rem; }
.max-w-7xl { max-width: 80rem; }

.leading-relaxed { line-height: 1.625; }

.transition-colors { transition: color 0.15s ease-in-out; }

.hover\:bg-green-200:hover { background-color: #bbf7d0; }
.hover\:bg-blue-200:hover { background-color: #dbeafe; }
.hover\:bg-purple-200:hover { background-color: #e9d5ff; }
.hover\:bg-orange-200:hover { background-color: #fed7aa; }

.hover\:text-green-600:hover { color: var(--green-600); }
.hover\:text-blue-700:hover { color: #1d4ed8; }

.bg-green-100 { background-color: #dcfce7; }
.bg-blue-100 { background-color: #dbeafe; }
.bg-purple-100 { background-color: #f3e8ff; }
.bg-orange-100 { background-color: #ffedd5; }

.text-green-700 { color: #15803d; }
.text-blue-700 { color: #1d4ed8; }
.text-purple-700 { color: #7c3aed; }
.text-orange-700 { color: #c2410c; }

.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.space-x-2 > * + * { margin-left: 0.5rem; }

.whitespace-nowrap { white-space: nowrap; }

.z-60 { z-index: 60; }

/* Enhanced Results Display */
.recommendation-item {
    background: #f9fafb;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.recommendation-item:hover {
    background: #f3f4f6;
    transform: translateY(-1px);
}

.grade-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grade-excellent {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.grade-good {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.grade-fair {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.grade-poor {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

/* Performance Indicators */
.performance-indicator {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid var(--primary-green);
    margin-bottom: 8px;
}

.performance-indicator .label {
    font-weight: 500;
    color: #374151;
}

.performance-indicator .value {
    font-weight: 600;
    color: var(--primary-green);
}

/* Cost Breakdown Chart */
.cost-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.cost-item {
    text-align: center;
    padding: 12px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}

.cost-item .percentage {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-green);
    display: block;
}

.cost-item .label {
    font-size: 0.75rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}

/* Enhanced Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.slide-in-up {
    animation: slideInUp 0.5s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* Confidence Indicator */
.confidence-indicator {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    border-radius: 20px;
    font-size: 0.875rem;
    color: #065f46;
}

.confidence-indicator::before {
    content: "🎯";
    font-size: 1rem;
}

/* Detailed Metrics Grid */
.detailed-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.metric-card {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    transition: all 0.2s ease;
}

.metric-card:hover {
    border-color: var(--primary-green);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.1);
}

.metric-card .metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-green);
    display: block;
    margin-bottom: 4px;
}

.metric-card .metric-label {
    font-size: 0.875rem;
    color: #6b7280;
    font-weight: 500;
}

/* Responsive enhancements */
@media (max-width: 768px) {
    .detailed-metrics {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .cost-breakdown {
        grid-template-columns: repeat(2, 1fr);
    }

    .recommendation-item {
        padding: 12px;
    }

    .grade-badge {
        font-size: 0.625rem;
        padding: 3px 8px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .dark-mode {
        --gray-50: #1f2937;
        --gray-100: #374151;
        --gray-200: #4b5563;
        --gray-300: #6b7280;
        --gray-900: #f9fafb;
        
        background: linear-gradient(135deg, #1f2937 0%, #064e3b 100%);
        color: var(--gray-900);
    }
}