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

:root {
    /* Color Palette */
    --color-primary: #1A535C;
    --color-secondary: #4ECDC4;
    --color-background: #F7FFF7;
    --color-accent: #FF6B6B;
    --color-warning: #FFE66D;
    
    /* Typography */
    --font-family: 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    --line-height-base: 1.5;
    --line-height-tight: 1.2;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 4px;
    --border-radius-large: 8px;
    
    /* Shadows */
    --shadow-light: 0 2px 4px rgba(26, 83, 92, 0.1);
    --shadow-medium: 0 4px 8px rgba(26, 83, 92, 0.15);
    --shadow-heavy: 0 8px 16px rgba(26, 83, 92, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

/* Base Typography */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-large); }

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Header */
.header {
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.header__title {
    margin-bottom: var(--spacing-xs);
    color: var(--color-background);
}

.header__subtitle {
    font-size: var(--font-size-large);
    opacity: 0.9;
    margin: 0;
}

/* Main Content */
.main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

/* Tabs Navigation */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--color-secondary);
    margin-bottom: var(--spacing-lg);
    gap: 0;
}

.tabs__button {
    background: none;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    border-bottom: 3px solid transparent;
    position: relative;
}

.tabs__button:hover {
    background-color: rgba(78, 205, 196, 0.1);
}

.tabs__button--active {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
    background-color: rgba(78, 205, 196, 0.05);
}

.tabs__button:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content--active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Form Sections */
.form-section {
    background: white;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    border-left: 4px solid var(--color-secondary);
}

.form-section__title {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(78, 205, 196, 0.3);
}

/* Form Groups */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group__label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.form-group__input,
.form-group__select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    background-color: white;
}

.form-group__input:focus,
.form-group__select:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.1);
}

.form-group__input:invalid {
    border-color: var(--color-accent);
}

.form-group__error {
    color: var(--color-accent);
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
    display: none;
}

.form-group__error.show {
    display: block;
}

.form-group__help {
    color: #666;
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
    display: block;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
    min-width: 120px;
}

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

.btn--primary:hover {
    background-color: #0f3a41;
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn--secondary {
    background-color: var(--color-secondary);
    color: var(--color-primary);
}

.btn--secondary:hover {
    background-color: #3bb5ad;
    transform: translateY(-1px);
}

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

.btn--danger:hover {
    background-color: #e55555;
}

.btn:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

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

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* Results Section */
.results {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
    margin-top: var(--spacing-lg);
    border-left: 4px solid var(--color-warning);
}

.results__title {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

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

.result-card {
    background: var(--color-background);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.result-card:hover {
    border-color: var(--color-secondary);
    transform: translateY(-2px);
}

.result-card--highlight {
    background: linear-gradient(135deg, var(--color-warning), #fff5a5);
    border-color: var(--color-warning);
}

.result-card__title {
    font-size: var(--font-size-small);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-card__value {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin: 0;
}

/* Summary */
.summary {
    background: rgba(78, 205, 196, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.summary__title {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.summary__items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.summary__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid rgba(78, 205, 196, 0.2);
}

.summary__item:last-child {
    border-bottom: none;
    font-weight: 600;
    font-size: var(--font-size-large);
}

.summary__label {
    color: var(--color-primary);
}

.summary__value {
    font-weight: 500;
    color: var(--color-primary);
}

.results__actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* History Section */
.history__title {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

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

.history__filters input {
    flex: 1;
    min-width: 120px;
}

.history__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.history__empty {
    text-align: center;
    color: #666;
    font-style: italic;
    padding: var(--spacing-xl);
}

.history-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border-left: 4px solid var(--color-secondary);
}

.history-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

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

.history-item__actions {
    display: flex;
    gap: var(--spacing-xs);
}

.history-item__details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    font-size: var(--font-size-small);
}

.history-item__detail {
    display: flex;
    justify-content: space-between;
}

/* FAQ Section */
.faq__title {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.faq__item {
    background: white;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.faq__question {
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: none;
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.faq__question::after {
    content: '+';
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-large);
    transition: var(--transition-fast);
}

.faq__question[aria-expanded="true"]::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq__question:hover {
    background-color: rgba(78, 205, 196, 0.05);
}

.faq__answer {
    padding: 0 var(--spacing-md);
    max-height: 0;
    overflow: hidden;
    transition: var(--transition-medium);
}

.faq__answer.show {
    padding: var(--spacing-md);
    max-height: 200px;
}

.faq__answer p {
    color: #666;
    line-height: var(--line-height-base);
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-background);
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer__text {
    margin: 0;
    font-size: var(--font-size-small);
}

.footer__text a {
    color: var(--color-secondary);
    text-decoration: none;
}

.footer__text a:hover {
    text-decoration: underline;
}

/* Loading Overlay */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 83, 92, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading__spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(78, 205, 196, 0.3);
    border-top: 4px solid var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading__text {
    color: var(--color-background);
    margin-top: var(--spacing-md);
    font-size: var(--font-size-large);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-md) 0;
    }
    
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tabs__button {
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: 1px solid rgba(78, 205, 196, 0.3);
        border-right: none;
    }
    
    .tabs__button--active {
        border-bottom-color: var(--color-secondary);
        border-right: none;
    }
    
    .form-section {
        padding: var(--spacing-md);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .results__grid {
        grid-template-columns: 1fr;
    }
    
    .summary__item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .history__filters {
        flex-direction: column;
    }
    
    .history__filters input,
    .history__filters button {
        width: 100%;
    }
    
    .history-item__header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .history-item__details {
        grid-template-columns: 1fr;
    }
    
    .results__actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --font-size-large: 16px;
        --font-size-xl: 20px;
        --font-size-xxl: 24px;
    }
    
    .form-section {
        margin-bottom: var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-sm);
        min-width: auto;
    }
}

/* Print Styles */
@media print {
    .header,
    .tabs,
    .form-actions,
    .results__actions,
    .footer {
        display: none;
    }
    
    .results {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    body {
        font-size: 12px;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000000;
        --color-secondary: #0066cc;
        --color-background: #ffffff;
        --color-accent: #cc0000;
        --color-warning: #ff9900;
    }
}

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