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

:root {
    /* Color Palette */
    --primary-dark: #05386B;
    --primary-medium: #379683;
    --primary-light: #5CDB95;
    --accent-light: #8EE4AF;
    --background-light: #EDF5E1;
    
    /* Additional Colors */
    --white: #ffffff;
    --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;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-family-mono: 'Courier New', monospace;
    --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: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(5, 56, 107, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(5, 56, 107, 0.1), 0 2px 4px -1px rgba(5, 56, 107, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(5, 56, 107, 0.1), 0 4px 6px -2px rgba(5, 56, 107, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(5, 56, 107, 0.1), 0 10px 10px -5px rgba(5, 56, 107, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(5, 56, 107, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-family);
    line-height: var(--leading-normal);
    color: var(--primary-dark);
    background-color: var(--background-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-dark);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
    transition: var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-medium) 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    font-weight: var(--font-weight-normal);
    position: relative;
    z-index: 1;
}

/* Main Content */
.main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* Section Titles */
.section__title {
    font-size: var(--font-size-2xl);
    color: var(--primary-dark);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-weight: var(--font-weight-semibold);
    position: relative;
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-medium), var(--primary-light));
    border-radius: var(--radius-full);
}

/* Calculator Section */
.calculator {
    margin-bottom: var(--spacing-2xl);
}

.calculator__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.calculator__form {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    position: relative;
}

.calculator__title {
    font-size: var(--font-size-xl);
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xl);
    font-weight: var(--font-weight-semibold);
}

.calculator__results {
    position: sticky;
    top: var(--spacing-xl);
}

/* Form Styles */
.form__instructions {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-medium);
}

.form__instructions p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin: 0;
}

.form__group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.form__label {
    display: block;
    font-weight: var(--font-weight-medium);
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.form__required {
    color: var(--error);
    margin-left: var(--spacing-xs);
}

.form__input,
.form__select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: var(--transition-base);
    background-color: var(--white);
    color: var(--gray-900);
}

.form__input:focus,
.form__select:focus {
    outline: none;
    border-color: var(--primary-medium);
    box-shadow: 0 0 0 3px rgba(55, 150, 131, 0.1);
    transform: translateY(-1px);
}

.form__input:hover:not(:disabled):not(:focus),
.form__select:hover:not(:disabled):not(:focus) {
    border-color: var(--gray-400);
}

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

.form__input.error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form__input--readonly {
    background-color: var(--gray-50);
    cursor: not-allowed;
    color: var(--gray-600);
}

.form__help {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    margin-top: var(--spacing-xs);
    display: block;
}

.form__error {
    display: block;
    color: var(--error);
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    min-height: 1rem;
    font-weight: var(--font-weight-medium);
}

.form__group.error .form__label {
    color: var(--error);
}

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

/* Button Styles */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-base);
}

.btn:hover::before {
    left: 100%;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary-medium), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

.btn--secondary {
    background: linear-gradient(135deg, var(--accent-light), var(--primary-light));
    color: var(--primary-dark);
    box-shadow: var(--shadow-sm);
}

.btn--secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn--outline {
    background-color: transparent;
    color: var(--primary-medium);
    border: 2px solid var(--primary-medium);
    box-shadow: none;
}

.btn--outline:hover:not(:disabled) {
    background-color: var(--primary-medium);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn__loader {
    display: none;
}

.btn.loading .btn__text {
    display: none;
}

.btn.loading .btn__loader {
    display: inline-block;
}

/* Results Section */
.results {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    animation: slideInUp 0.5s ease-out;
}

.results__title {
    font-size: var(--font-size-xl);
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xl);
    font-weight: var(--font-weight-semibold);
    text-align: center;
}

.results__summary {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.result-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
}

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

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

.result-card__label {
    font-size: var(--font-size-sm);
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    opacity: 0.8;
}

.result-card__value {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--primary-dark);
    font-family: var(--font-family-mono);
}

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

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(5, 56, 107, 0.8);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease-out;
}

.modal__content {
    background: var(--white);
    border-radius: var(--radius-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    display: flex;
    flex-direction: column;
    animation: scaleIn 0.3s ease-out;
}

.modal__header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--gray-50), var(--white));
}

.modal__title {
    font-size: var(--font-size-xl);
    color: var(--primary-dark);
    font-weight: var(--font-weight-semibold);
}

.modal__close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal__close:hover {
    background-color: var(--gray-100);
    color: var(--gray-600);
}

.modal__body {
    padding: var(--spacing-xl);
    overflow: auto;
    flex: 1;
}

/* Table Styles */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.schedule-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    background: var(--white);
}

.schedule-table th,
.schedule-table td {
    padding: var(--spacing-md);
    text-align: right;
    border-bottom: 1px solid var(--gray-200);
}

.schedule-table th:first-child,
.schedule-table td:first-child {
    text-align: center;
}

.schedule-table th {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-medium));
    color: white;
    font-weight: var(--font-weight-semibold);
    position: sticky;
    top: 0;
    z-index: 1;
}

.schedule-table tbody tr:nth-child(even) {
    background-color: var(--gray-50);
}

.schedule-table tbody tr:hover {
    background-color: var(--accent-light);
    transition: var(--transition-fast);
}

.schedule-table td {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
}

/* Chart Styles */
.chart-container {
    width: 100%;
    height: 400px;
    position: relative;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

#debt-chart {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* Saved Simulations */
.saved-simulations {
    margin-bottom: var(--spacing-2xl);
}

.simulations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.simulation-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-medium);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.simulation-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 20px 20px 0;
    border-color: transparent var(--primary-light) transparent transparent;
}

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

.simulation-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.simulation-card__date {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-weight: var(--font-weight-medium);
}

.simulation-card__delete {
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
}

.simulation-card__delete:hover {
    background-color: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

.simulation-card__details {
    display: grid;
    gap: var(--spacing-sm);
}

.simulation-card__detail {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--gray-100);
}

.simulation-card__detail:last-child {
    border-bottom: none;
}

.simulation-card__label {
    color: var(--gray-600);
    font-weight: var(--font-weight-medium);
}

.simulation-card__value {
    font-weight: var(--font-weight-semibold);
    color: var(--primary-dark);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
}

/* FAQ Styles */
.faq {
    margin-bottom: var(--spacing-2xl);
}

.faq__container {
    max-width: 800px;
    margin: 0 auto;
}

.faq__list {
    display: grid;
    gap: var(--spacing-md);
}

.faq__item {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    transition: var(--transition-base);
}

.faq__item:hover {
    box-shadow: var(--shadow-lg);
}

.faq__question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--primary-dark);
    transition: var(--transition-base);
    font-family: var(--font-family);
}

.faq__question:hover {
    background-color: var(--gray-50);
}

.faq__question[aria-expanded="true"] {
    background: linear-gradient(135deg, var(--primary-medium), var(--primary-light));
    color: white;
}

.faq__question[aria-expanded="true"] .faq__icon {
    transform: rotate(45deg);
    color: white;
}

.faq__icon {
    font-size: var(--font-size-xl);
    transition: var(--transition-base);
    color: var(--primary-medium);
    font-weight: var(--font-weight-bold);
}

.faq__answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--gray-700);
    line-height: var(--leading-relaxed);
    display: none;
    background: var(--gray-50);
}

.faq__answer.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.faq__answer p {
    margin-bottom: var(--spacing-md);
}

.faq__answer p:last-child {
    margin-bottom: 0;
}

.faq__answer strong {
    color: var(--primary-dark);
    font-weight: var(--font-weight-semibold);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-medium) 100%);
    color: white;
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: auto;
    position: relative;
}

.footer__link {
    color: var(--light-color);
    text-decoration: none;
    transition: var(--transition);
}
.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-light), var(--primary-light));
}

.footer__text {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    font-weight: var(--font-weight-medium);
}

/* Loading Spinner */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(2px);
}

.loading__spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--accent-light);
    border-top: 4px solid var(--primary-medium);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

/* Toast Notifications */
.toast {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-medium), var(--primary-light));
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-toast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    max-width: 400px;
    min-width: 250px;
    animation: slideInRight 0.3s ease-out;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.toast--error {
    background: linear-gradient(135deg, var(--error), #dc2626);
}

.toast--success {
    background: linear-gradient(135deg, var(--success), #059669);
}

.toast--warning {
    background: linear-gradient(135deg, var(--warning), #d97706);
    color: var(--gray-900);
}

.toast--info {
    background: linear-gradient(135deg, var(--info), #2563eb);
}

.toast__message {
    flex: 1;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
}

.toast__close {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: var(--font-size-lg);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    opacity: 0.8;
}

.toast__close:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.1);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 200px;
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleIn {
    from { 
        opacity: 0;
        transform: scale(0.9);
    }
    to { 
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .calculator__container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .calculator__results {
        position: static;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .header__title {
        font-size: var(--font-size-2xl);
    }
    
    .header__subtitle {
        font-size: var(--font-size-base);
    }
    
    .calculator__form,
    .results {
        padding: var(--spacing-lg);
    }
    
    .form__actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .results__actions {
        gap: var(--spacing-sm);
    }
    
    .modal__content {
        max-width: 95vw;
        margin: var(--spacing-md);
    }
    
    .modal__header,
    .modal__body {
        padding: var(--spacing-lg);
    }
    
    .schedule-table {
        font-size: var(--font-size-xs);
    }
    
    .schedule-table th,
    .schedule-table td {
        padding: var(--spacing-sm);
    }
    
    .toast {
        right: var(--spacing-md);
        left: var(--spacing-md);
        max-width: none;
    }
    
    .simulations-grid {
        grid-template-columns: 1fr;
    }
    
    .result-card__value {
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-md) 0;
    }
    
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .header__subtitle {
        font-size: var(--font-size-sm);
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .section__title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-lg);
    }
    
    .calculator__form,
    .results {
        padding: var(--spacing-md);
    }
    
    .form__group {
        margin-bottom: var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
        min-height: 40px;
    }
    
    .result-card {
        padding: var(--spacing-md);
    }
    
    .result-card__value {
        font-size: var(--font-size-base);
    }
    
    .modal__content {
        max-height: 95vh;
    }
    
    .chart-container {
        height: 300px;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .form__actions,
    .results__actions,
    .btn,
    .modal,
    .toast,
    .loading {
        display: none !important;
    }
    
    .calculator__container {
        grid-template-columns: 1fr;
    }
    
    .results {
        box-shadow: none;
        border: 2px solid var(--gray-300);
        page-break-inside: avoid;
    }
    
    .schedule-table {
        font-size: 10px;
    }
    
    .schedule-table th {
        background: var(--gray-200) !important;
        color: var(--gray-900) !important;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-dark: #000000;
        --primary-medium: #0066cc;
        --primary-light: #0080ff;
        --accent-light: #00cc66;
        --background-light: #ffffff;
        --gray-300: #666666;
        --gray-600: #333333;
    }
    
    .form__input,
    .form__select {
        border-width: 3px;
    }
    
    .btn {
        border: 2px solid currentColor;
        font-weight: var(--font-weight-bold);
    }
    
    .result-card {
        border: 2px solid var(--primary-dark);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .btn::before {
        display: none;
    }
}

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

.btn:focus,
.form__input:focus,
.form__select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(55, 150, 131, 0.3);
}

.modal__close:focus,
.toast__close:focus,
.faq__question:focus {
    outline: 2px solid var(--primary-medium);
    outline-offset: 2px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-light: #1a1a1a;
        --white: #2d2d2d;
        --gray-50: #404040;
        --gray-100: #525252;
        --gray-200: #737373;
        --gray-300: #a3a3a3;
        --primary-dark: #ffffff;
    }
    
    body {
        background-color: var(--background-light);
        color: var(--primary-dark);
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-medium);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Selection styles */
::selection {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}

::-moz-selection {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}