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

:root {
    /* Brand Colors */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-lg) var(--spacing-sm);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* ========================
   Header
   ======================== */
.header {
    background: linear-gradient(135deg, #1e40af 0%, #7c3aed 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.5px;
}

.header-content h2 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* ========================
   Main Content
   ======================== */
.main-content {
    padding: var(--spacing-xl) var(--spacing-lg);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title i {
    color: var(--primary-color);
}

/* ========================
   Input Section
   ======================== */
.input-section {
    background: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--gray-200);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-group label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.input-group label i {
    color: var(--primary-color);
    width: 20px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: 0.75rem 3rem 0.75rem 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-wrapper .unit {
    position: absolute;
    right: 1rem;
    color: var(--gray-500);
    font-weight: 500;
    pointer-events: none;
}

/* Input wrapper with select (for period selection) */
.input-wrapper-with-select {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-wrapper-with-select input {
    flex: 1;
    padding: 0.75rem 3.5rem 0.75rem 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.input-wrapper-with-select input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.period-select {
    padding: 0.75rem 0.5rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 70px;
    font-weight: 500;
}

.period-select:hover {
    border-color: var(--gray-400);
}

.period-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-wrapper-with-select .unit {
    position: absolute;
    right: 85px;
    color: var(--gray-500);
    font-weight: 500;
    pointer-events: none;
}

.help-text {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

.calculate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

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

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

.calculate-btn i {
    font-size: 1.2rem;
}

/* ========================
   Results Section
   ======================== */
.results-section {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.comparison-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.cost-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--gray-200);
    transition: all 0.3s ease;
}

.cost-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.employee-card {
    border-top: 4px solid var(--primary-color);
}

.hybrid-card {
    border-top: 4px solid var(--accent-color);
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-50);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.employee-card .card-header {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(37, 99, 235, 0.05) 100%);
}

.hybrid-card .card-header {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.card-header i {
    font-size: 1.5rem;
}

.employee-card .card-header i {
    color: var(--primary-color);
}

.hybrid-card .card-header i {
    color: var(--accent-color);
}

.card-header h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-800);
}

.cost-breakdown {
    padding: var(--spacing-lg);
}

.cost-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-200);
}

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

.cost-item .label {
    color: var(--gray-600);
    font-size: 0.95rem;
}

.cost-item .value {
    font-weight: 700;
    color: var(--gray-800);
    font-size: 1rem;
}

.total-cost {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 2px solid var(--gray-200);
}

.total-cost .label {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-800);
}

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

.hybrid-card .total-cost .value {
    color: var(--accent-color);
}

/* ========================
   Savings Card
   ======================== */
.savings-card {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(5, 150, 105, 0.05) 100%);
    border: 2px solid var(--accent-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.savings-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.savings-header i {
    font-size: 2rem;
    color: var(--accent-color);
}

.savings-header h4 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gray-800);
}

.savings-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.savings-amount,
.savings-percentage {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.savings-amount .label,
.savings-percentage .label {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.savings-amount .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
}

.savings-percentage .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
}

/* ========================
   Chart Container
   ======================== */
.chart-container {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--gray-200);
}

.chart-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.chart-wrapper {
    position: relative;
    height: 350px;
    width: 100%;
}

/* ========================
   Insights Grid
   ======================== */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.insight-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.benefits {
    border-top: 4px solid var(--accent-color);
}

.considerations {
    border-top: 4px solid var(--warning-color);
}

.insight-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.benefits h4 {
    color: var(--accent-color);
}

.considerations h4 {
    color: var(--warning-color);
}

.insight-card h4 i {
    font-size: 1.3rem;
}

.insight-card ul {
    list-style: none;
    padding: 0;
}

.insight-card ul li {
    padding: var(--spacing-sm) 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
    line-height: 1.6;
}

.insight-card ul li::before {
    content: "●";
    position: absolute;
    left: 0;
    font-size: 0.8rem;
}

.benefits ul li::before {
    color: var(--accent-color);
}

.considerations ul li::before {
    color: var(--warning-color);
}

/* ========================
   Footer
   ======================== */
.footer {
    background: var(--gray-800);
    color: white;
    padding: var(--spacing-lg);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.company-name {
    font-size: 1rem;
    font-weight: 600;
}

.confidential {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* ========================
   Responsive Design
   ======================== */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .header-content h1 {
        font-size: 1.5rem;
    }
    
    .header-content h2 {
        font-size: 1.2rem;
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .input-section {
        padding: var(--spacing-lg);
    }
    
    .input-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .comparison-cards {
        grid-template-columns: 1fr;
    }
    
    .savings-content {
        grid-template-columns: 1fr;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-wrapper {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .header-content h1 {
        font-size: 1.3rem;
    }
    
    .header-content h2 {
        font-size: 1.1rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .savings-amount .value,
    .savings-percentage .value {
        font-size: 2rem;
    }
    
    .chart-wrapper {
        height: 280px;
    }
}

/* ========================
   Print Styles
   ======================== */
@media print {
    body {
        background: white;
        padding: 0;
    }
    
    .container {
        box-shadow: none;
    }
    
    .calculate-btn {
        display: none;
    }
    
    .cost-card {
        page-break-inside: avoid;
    }
}