/* ========================================
   PERSONAL FINANCIAL PLANNING PLANNER
   Reset and Foundation
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #dbeafe;
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-danger: #ef4444;
    --color-danger-light: #fee2e2;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-bg-light: #f9fafb;
    --color-bg-white: #ffffff;
    --color-bg-dark: #111827;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f3f4f6;
        --color-text-muted: #9ca3af;
        --color-border: #374151;
        --color-bg-light: #1f2937;
        --color-bg-white: #111827;
    }
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg-light);
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
}

h3 {
    font-size: 1.25rem;
    margin-top: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

p {
    margin-bottom: var(--spacing-sm);
}

code {
    background-color: var(--color-bg-light);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

ol, ul {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

li {
    margin-bottom: 0.5rem;
}

/* ========================================
   Layout: Page Wrapper
   ======================================== */

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

header h1 {
    margin-bottom: var(--spacing-xs);
    color: white;
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
}

.subheading {
    font-size: 0.95rem;
    opacity: 0.85;
    font-weight: 500;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

main {
    flex: 1;
    padding: var(--spacing-lg);
}

footer {
    background-color: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ========================================
   Cards and Sections
   ======================================== */

.disclaimer {
    background-color: var(--color-warning-light);
    border: 2px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (prefers-color-scheme: dark) {
    .disclaimer {
        background-color: rgba(245, 158, 11, 0.1);
        border-color: rgba(245, 158, 11, 0.5);
    }
}

.disclaimer h2 {
    margin-top: 0;
    color: var(--color-warning);
}

.disclaimer p {
    margin-bottom: 0.5rem;
}

.input-section, .results-section, .methodology-section {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Scenario Selector
   ======================================== */

.scenario-selector {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.scenario-selector h3 {
    margin-top: 0;
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.scenario-btn {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-light);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.scenario-btn:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.scenario-btn.active {
    border-color: var(--color-primary);
    background-color: var(--color-primary);
    color: white;
}

.scenario-btn.active .scenario-name {
    font-weight: 600;
}

.scenario-name {
    display: block;
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.scenario-desc {
    display: block;
    font-size: 0.875rem;
    opacity: 0.8;
}

.scenario-btn.active .scenario-desc {
    color: rgba(255, 255, 255, 0.9);
}

/* ========================================
   Forms
   ======================================== */

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

.form-group {
    display: flex;
    flex-direction: column;
    position: relative;
}

label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 700;
    font-size: 0.75rem;
    cursor: help;
    flex-shrink: 0;
}

input[type="number"],
input[type="text"],
input[type="email"],
select {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-sans);
    background-color: var(--color-bg-white);
    color: var(--color-text);
    transition: border-color 0.2s ease;
}

input[type="number"]:focus,
input[type="text"]:focus,
input[type="email"]:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input-prefix {
    position: absolute;
    left: var(--spacing-sm);
    top: 2.5rem;
    font-weight: 500;
    color: var(--color-text-muted);
    pointer-events: none;
}

.form-group:has(> input[type="number"]:not([id$="Income"]):not([id$="Savings"]):not([id$="Expenses"]):not([id$="Amount"]):not([id$="Spending"])),
.form-group:has(> input[type="number"][id$="Return"]),
.form-group:has(> input[type="number"][id$="Growth"]),
.form-group:has(> input[type="number"][id$="Inflation"]),
.form-group:has(> input[type="number"][id$="Rate"]),
.form-group:has(> input[type="number"][id$="Contribution"]) {
    position: relative;
}

.form-group:has(> span.input-prefix) > input[type="number"] {
    padding-left: 2.5rem;
}

.input-unit {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

fieldset {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

legend {
    font-weight: 600;
    padding: 0 var(--spacing-sm);
    margin-left: -0.5rem;
}

.major-expense-fields {
    margin-top: var(--spacing-md);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--color-bg-light);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-white);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.control-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.control-buttons .btn {
    flex: 1;
    min-width: 150px;
}

@media (max-width: 640px) {
    .control-buttons .btn {
        flex-basis: 100%;
    }
}

/* ========================================
   Results Display
   ======================================== */

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.metric-card {
    background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-white) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.metric-card h3 {
    margin-top: 0;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-sm) 0;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

.status-card {
    background: linear-gradient(135deg, var(--color-success-light) 0%, var(--color-bg-white) 100%);
    border-color: var(--color-success);
}

.status-card .metric-value {
    color: var(--color-success);
}

.status-card.at-risk {
    background: linear-gradient(135deg, var(--color-warning-light) 0%, var(--color-bg-white) 100%);
    border-color: var(--color-warning);
}

.status-card.at-risk .metric-value {
    color: var(--color-warning);
}

.status-card.off-track {
    background: linear-gradient(135deg, var(--color-danger-light) 0%, var(--color-bg-white) 100%);
    border-color: var(--color-danger);
}

.status-card.off-track .metric-value {
    color: var(--color-danger);
}

/* ========================================
   Gap Section
   ======================================== */

.gap-section {
    background-color: var(--color-bg-light);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.gap-section h3 {
    margin-top: 0;
}

.gap-display {
    text-align: center;
}

.gap-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin: var(--spacing-md) 0;
    color: var(--color-primary);
}

.gap-value.positive {
    color: var(--color-success);
}

.gap-value.negative {
    color: var(--color-danger);
}

.gap-explanation {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ========================================
   Chart
   ======================================== */

.chart-section {
    margin-bottom: var(--spacing-lg);
}

.chart-container {
    position: relative;
    height: 400px;
    margin-bottom: var(--spacing-md);
}

.chart-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-align: center;
    margin: 0;
}

/* ========================================
   Scenario Comparison Table
   ======================================== */

.scenario-comparison {
    margin-bottom: var(--spacing-lg);
}

.comparison-table-container {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
    background-color: var(--color-bg-light);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.comparison-table tr:hover {
    background-color: var(--color-bg-light);
}

.scenario-row[data-scenario="conservative"] {
    border-left: 4px solid #666;
}

.scenario-row[data-scenario="moderate"] {
    border-left: 4px solid var(--color-primary);
}

.scenario-row[data-scenario="optimistic"] {
    border-left: 4px solid var(--color-success);
}

/* ========================================
   Assumptions
   ======================================== */

.assumptions-section {
    background-color: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.assumption-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--color-bg-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.assumption-label {
    font-weight: 500;
    color: var(--color-text-muted);
}

.assumption-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* ========================================
   Methodology Section
   ======================================== */

.methodology-content {
    margin-top: var(--spacing-md);
}

.methodology-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.methodology-content ol, .methodology-content ul {
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Accessibility & Print Styles
   ======================================== */

/* Skip to main content link (hidden by default) */
.skip-link {
    position: absolute;
    top: -9999px;
    left: -9999px;
    z-index: 999;
}

.skip-link:focus {
    top: 0;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm);
    text-decoration: none;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

@media print {
    body {
        background: white;
        color: black;
    }

    header, footer, .disclaimer, .control-buttons, .scenario-selector {
        display: none;
    }

    .page-wrapper {
        min-height: auto;
    }

    .input-section, .results-section, .methodology-section {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
        margin-bottom: 2rem;
    }

    .metric-card {
        page-break-inside: avoid;
    }

    a {
        color: black;
    }

    h1, h2, h3 {
        page-break-after: avoid;
    }

    .chart-container {
        page-break-inside: avoid;
        max-height: 6in;
    }
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    main {
        padding: var(--spacing-md);
    }

    .input-section, .results-section, .methodology-section {
        padding: var(--spacing-md);
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .scenario-btn {
        width: 100%;
    }

    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .control-buttons {
        flex-direction: column;
    }

    .control-buttons .btn {
        width: 100%;
    }

    .comparison-table-container {
        font-size: 0.875rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.5rem 0.25rem;
    }

    .chart-container {
        height: 300px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    h3 {
        font-size: 1rem;
    }

    main {
        padding: var(--spacing-sm);
    }

    .input-section, .results-section, .methodology-section {
        padding: var(--spacing-sm);
        border-radius: var(--radius-md);
    }

    .disclaimer {
        padding: var(--spacing-sm);
    }

    .metric-value {
        font-size: 1.5rem;
    }

    .gap-value {
        font-size: 2rem;
    }

    .assumptions-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 250px;
    }
}

/* Dark mode enhancements */
@media (prefers-color-scheme: dark) {
    .scenario-btn {
        background-color: var(--color-bg-light);
    }

    .scenario-btn:hover {
        background-color: rgba(37, 99, 235, 0.1);
    }

    .metric-card {
        background: linear-gradient(135deg, rgba(17, 24, 39, 0.5) 0%, var(--color-bg-white) 100%);
    }

    .comparison-table th {
        background-color: var(--color-bg-light);
    }

    .comparison-table tr:hover {
        background-color: var(--color-bg-light);
    }

    .gap-section {
        background-color: var(--color-bg-light);
    }

    .assumptions-section {
        background-color: var(--color-bg-light);
    }

    .assumption-item {
        background-color: var(--color-bg-white);
    }
}