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

:root {
    --color-primary: #F8B195;
    --color-secondary: #F67280;
    --color-tertiary: #C06C84;
    --color-quaternary: #6C5B7B;
    --color-quinary: #355C7D;
    
    --color-success: #4CAF50;
    --color-error: #F44336;
    --color-warning: #FF9800;
    --color-info: #2196F3;
    
    --color-white: #FFFFFF;
    --color-light: #F8F9FA;
    --color-dark: #2C3E50;
    --color-gray: #6C757D;
    --color-light-gray: #E9ECEF;
    
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
    
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-light) 0%, #E3F2FD 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--color-quinary) 0%, var(--color-quaternary) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.header__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header__icon {
    font-size: var(--font-size-xxl);
}

.header__nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav__link {
    color: var(--color-white);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

.nav__link:hover,
.nav__link--active {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

/* Card Styles */
.calculator__card,
.results__card,
.simulations__card,
.formula__card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    transition: var(--transition);
}

.calculator__card:hover,
.results__card:hover,
.simulations__card:hover,
.formula__card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Calculator Styles */
.calculator__title,
.results__title,
.simulations__title,
.formula__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-quinary);
}

.calculator__icon,
.results__icon,
.simulations__icon,
.formula__icon {
    font-size: var(--font-size-xxl);
}

/* Form Styles */
.calculator__form {
    display: grid;
    gap: var(--spacing-lg);
}

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

.form__label {
    font-weight: 600;
    color: var(--color-quaternary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.label__icon {
    font-size: var(--font-size-lg);
}

.form__input,
.form__select {
    padding: var(--spacing-md);
    border: 2px solid var(--color-light-gray);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition);
    background-color: var(--color-white);
}

.form__input:focus,
.form__select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(248, 177, 149, 0.2);
}

.form__input:invalid {
    border-color: var(--color-error);
}

.form__help {
    color: var(--color-gray);
    font-size: var(--font-size-sm);
}

.form__actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* Button Styles */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    justify-content: center;
    min-height: 48px;
}

.btn__icon {
    font-size: var(--font-size-lg);
}

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

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

.btn--secondary {
    background-color: var(--color-light-gray);
    color: var(--color-dark);
}

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

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

.btn--success:hover {
    background-color: #45a049;
    transform: translateY(-2px);
}

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

.btn--info:hover {
    background-color: #1976D2;
    transform: translateY(-2px);
}

.btn--danger {
    background-color: var(--color-error);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn--danger:hover {
    background-color: #d32f2f;
}

/* Results Styles */
.results {
    animation: fadeInUp 0.5s ease;
}

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

.result__item {
    background: linear-gradient(135deg, var(--color-light) 0%, #F0F8FF 100%);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-left: 4px solid;
    transition: var(--transition);
}

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

.result__item--capital {
    border-left-color: var(--color-info);
}

.result__item--interest {
    border-left-color: var(--color-warning);
}

.result__item--total {
    border-left-color: var(--color-success);
}

.result__icon {
    font-size: var(--font-size-xxl);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.result__content {
    flex: 1;
}

.result__label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray);
    margin-bottom: var(--spacing-xs);
}

.result__value {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-quinary);
}

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

/* Calculation Summary */
.calculation__summary {
    background: linear-gradient(135deg, var(--color-quaternary) 0%, var(--color-quinary) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.calculation__summary h4 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.calculation__summary p {
    margin-bottom: var(--spacing-sm);
    font-family: 'Courier New', monospace;
}

/* Simulations Styles */
.simulations__list {
    display: grid;
    gap: var(--spacing-md);
}

.simulation__item {
    background: var(--color-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition);
}

.simulation__item:hover {
    background-color: var(--color-white);
    box-shadow: var(--shadow);
}

.simulation__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.simulation__date {
    font-size: var(--font-size-sm);
    color: var(--color-gray);
}

.simulation__type {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.simulation__type--investment {
    background-color: var(--color-success);
    color: var(--color-white);
}

.simulation__type--debt {
    background-color: var(--color-error);
    color: var(--color-white);
}

.simulation__details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.simulation__detail {
    text-align: center;
}

.simulation__detail-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray);
    margin-bottom: var(--spacing-xs);
}

.simulation__detail-value {
    display: block;
    font-weight: 600;
    color: var(--color-quinary);
}

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

.simulation__empty {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--color-gray);
}

.simulation__empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

/* Formula Styles */
.formula__content {
    display: grid;
    gap: var(--spacing-xl);
}

.formula__explanation,
.formula__example {
    background: var(--color-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
}

.formula__explanation h4,
.formula__example h4 {
    color: var(--color-quinary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.formula__math {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    text-align: center;
}

.math__equation {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-quinary);
    margin-bottom: var(--spacing-sm);
}

.formula__legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.legend__item {
    padding: var(--spacing-sm);
    background: var(--color-white);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
}

.example__calculation {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
}

.example__calculation p {
    font-family: 'Courier New', monospace;
    margin-bottom: var(--spacing-sm);
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, var(--color-quaternary) 0%, var(--color-quinary) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: auto;
}

.footer__text {
    margin: 0;
}

.footer__link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer__link:hover {
    color: var(--color-white);
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--color-success);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: var(--transition);
    z-index: 1000;
    max-width: 300px;
}

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

.toast__content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast__icon {
    font-size: var(--font-size-lg);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header .container {
        flex-direction: column;
        text-align: center;
    }
    
    .header__title {
        font-size: var(--font-size-lg);
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .calculator__card,
    .results__card,
    .simulations__card,
    .formula__card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
    
    .form__actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .results__grid {
        grid-template-columns: 1fr;
    }
    
    .results__actions {
        flex-direction: column;
    }
    
    .simulation__header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .simulation__details {
        grid-template-columns: 1fr 1fr;
    }
    
    .simulation__actions {
        justify-content: center;
    }
    
    .formula__content {
        gap: var(--spacing-lg);
    }
    
    .formula__legend {
        grid-template-columns: 1fr;
    }
    
    .toast {
        right: var(--spacing-sm);
        left: var(--spacing-sm);
        max-width: none;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --font-size-lg: 16px;
        --font-size-xl: 20px;
        --font-size-xxl: 24px;
    }
    
    .header__title {
        font-size: var(--font-size-lg);
    }
    
    .calculator__title,
    .results__title,
    .simulations__title,
    .formula__title {
        font-size: var(--font-size-lg);
    }
    
    .simulation__details {
        grid-template-columns: 1fr;
    }
    
    .result__item {
        flex-direction: column;
        text-align: center;
    }
    
    .result__icon {
        width: 50px;
        height: 50px;
    }
}

/* Print Styles */
@media print {
    .header__nav,
    .form__actions,
    .results__actions,
    .simulation__actions,
    .footer {
        display: none;
    }
    
    body {
        background: white;
    }
    
    .calculator__card,
    .results__card,
    .simulations__card,
    .formula__card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000080;
        --color-secondary: #800080;
        --color-tertiary: #008000;
        --color-quaternary: #000000;
        --color-quinary: #000000;
    }
}

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

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--color-info);
    outline-offset: 2px;
}

.btn:focus,
.form__input:focus,
.form__select:focus {
    outline: 2px solid var(--color-info);
    outline-offset: 2px;
}

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

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

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}