/* ===== CSS Variables (相続税シミュレーションと統一) ===== */
:root {
    /* Primary Colors */
    --primary-color: #2c3e50;
    --primary-light: #34495e;
    --primary-dark: #1a252f;
    
    /* Secondary Colors */
    --secondary-color: #3498db;
    --secondary-light: #5dade2;
    --secondary-dark: #2980b9;
    
    /* Accent Colors */
    --accent-color: #e74c3c;
    --accent-light: #ec7063;
    --accent-dark: #c0392b;
    
    /* Success Colors */
    --success-color: #27ae60;
    --success-light: #58d68d;
    --success-dark: #229954;
    
    /* Warning Colors */
    --warning-color: #f39c12;
    --warning-light: #f7dc6f;
    --warning-dark: #d68910;
    
    /* Neutral Colors */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-light: #ecf0f1;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --border-radius-large: 16px;
    --shadow-sm: 0 2px 4px var(--shadow-color);
    --shadow-md: 0 4px 6px var(--shadow-color);
    --shadow-lg: 0 10px 15px var(--shadow-color);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-light) 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Container ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: 2rem 0;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

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

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.main-title i {
    font-size: 2.2rem;
    color: var(--secondary-light);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    padding-bottom: 2rem;
}

/* ===== Section Styles ===== */
.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.section-title i {
    color: var(--secondary-color);
    font-size: 1.3rem;
}

/* ===== Income Type Section ===== */
.income-type-section {
    margin-bottom: 2rem;
}

.income-type-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.income-type-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.income-type-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.income-type-card.selected {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
    color: white;
    box-shadow: var(--shadow-lg);
}

.income-type-card i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
    transition: color var(--transition-normal);
}

.income-type-card.selected i {
    color: white;
}

.income-type-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.income-type-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.income-type-card.selected p {
    color: rgba(255, 255, 255, 0.9);
}

/* ===== Calculation Mode Section ===== */
.calculation-mode-section {
    margin-bottom: 2rem;
}

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

.mode-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.mode-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mode-card.selected {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05) 0%, rgba(93, 173, 226, 0.05) 100%);
    box-shadow: var(--shadow-lg);
}

.mode-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.mode-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.mode-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.mode-features {
    list-style: none;
    padding: 0;
}

.mode-features li {
    padding: 0.3rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.mode-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ===== Form Styles ===== */
.input-form-section {
    margin-bottom: 2rem;
}

.simulation-form {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.form-group-section {
    margin-bottom: 2rem;
}

.form-section-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.required {
    color: var(--accent-color);
    margin-left: 0.25rem;
}

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

.form-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    background-color: var(--bg-primary);
}

.form-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
}

.input-unit {
    margin-left: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.help-text {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===== Form Actions ===== */
.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.calculate-btn, .reset-btn, .new-calculation-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.calculate-btn {
    background: linear-gradient(135deg, var(--success-color) 0%, var(--success-light) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.calculate-btn:hover {
    background: linear-gradient(135deg, var(--success-dark) 0%, var(--success-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.reset-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.reset-btn:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.new-calculation-btn {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.new-calculation-btn:hover {
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== Result Section ===== */
.result-section {
    margin-bottom: 2rem;
}

.result-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    text-align: center;
}

.result-main {
    margin-bottom: 2rem;
}

.result-target {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.result-target i {
    color: var(--secondary-color);
    font-size: 1.5rem;
}

.result-target h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.result-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.amount-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success-color);
    font-family: var(--font-secondary);
}

.amount-unit {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.self-burden {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-left: 1rem;
}

.result-total {
    background: linear-gradient(135deg, var(--success-color) 0%, var(--success-light) 100%);
    color: white;
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius-large);
    border: 3px solid var(--success-color);
}

.total-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.total-label i {
    font-size: 1.2rem;
}

.total-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
}

.total-value {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-secondary);
}

.total-unit {
    font-size: 1.1rem;
    font-weight: 500;
}

.result-actions {
    margin-top: 2rem;
    text-align: center;
}

/* ===== Notice Section ===== */
.notice-section {
    margin-bottom: 2rem;
}

.notice-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    border: 1px solid var(--warning-color);
    border-left: 5px solid var(--warning-color);
    box-shadow: var(--shadow-sm);
}

.notice-list {
    list-style: none;
    padding: 0;
}

.notice-list li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.notice-list li::before {
    content: '!';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--warning-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: bold;
}

.notice-list li strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== Footer ===== */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
}

.footer-content p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .main-title {
        font-size: 1.8rem;
    }
    
    .main-title i {
        font-size: 1.6rem;
    }
    
    .income-type-selector,
    .mode-selector {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .calculate-btn,
    .reset-btn,
    .new-calculation-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .result-amount {
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
    }
    
    .self-burden {
        margin-left: 0;
        margin-top: 0.5rem;
    }
    
    .amount-value {
        font-size: 2rem;
    }
    
    .total-value {
        font-size: 1.8rem;
    }
    
    .simulation-form {
        padding: 1.5rem;
    }
    
    .result-card {
        padding: 1.5rem;
    }
    
    .notice-content {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1.5rem 0;
    }
    
    .main-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .income-type-card,
    .mode-card {
        padding: 1.5rem;
    }
    
    .amount-value {
        font-size: 1.8rem;
    }
    
    .total-value {
        font-size: 1.6rem;
    }
    
    .simulation-form {
        padding: 1rem;
    }
    
    .result-card {
        padding: 1rem;
    }
}

/* ===== Animation Classes ===== */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Focus indicators */
button:focus,
input:focus,
.income-type-card:focus,
.mode-card:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* High contrast support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}