/**
 * Charts CSS - Exchange Rate Chart Styles
 * Organized, optimized, and fully compatible with main.css
 *
 * Table of Contents:
 * 1. Chart Widget Container
 * 2. Chart Header & Controls
 * 3. Chart Container & SVG
 * 4. Chart Elements
 * 5. Tooltip System (New Floating Style)
 * 6. Statistics & Data Display
 * 7. States (Loading, Error, Empty)
 * 8. Chart Variations
 * 9. Page Layouts
 * 10. Animations
 * 11. Theme Support
 * 12. Responsive Design
 * 13. Accessibility
 */

/* ===================================
   1. CHART WIDGET CONTAINER
   =================================== */
/* Global chart variables */
:root {
    --chart-padding: var(--spacing-sm);
    --chart-transition: var(--transition-base);
}

/* Chart interactivity classes for CSP compliance */
.cp-dimmed {
    opacity: 0.5;
}

.cp-highlighted {
    opacity: 1;
}

.cp-hidden {
    opacity: 0;
}

/* CSP-compliant chart classes */
.chart-text {
    vector-effect: non-scaling-stroke;
}

.chart-svg-full {
    width: 100%;
    height: 100%;
}

.chart-custom-height {
    height: var(--chart-height);
}

.widget-chart-dynamic {
    height: var(--widget-height);
}

.rate-change-spaced {
    margin-left: 16px;
}

.chart-gradient-start {
    stop-color: #4f8df9;
    stop-opacity: 0.3;
}

.chart-gradient-end {
    stop-color: #4f8df9;
    stop-opacity: 0.05;
}

.currency-chart-widget {
    overflow: hidden;
}

/* Chart Wrapper - Container principal para gráficos */
.chart-wrapper {
    width: 100%;
    position: relative;
}

/* ===================================
   2. CHART HEADER & CONTROLS
   =================================== */
.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--chart-padding);
    border: none;
    background: var(--color-table-even);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.chart-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    order: 2;
}

/* Chart Swap Button in Header */
.chart-header .chart-swap-button {
    background: var(--color-primary);
    color: var(--color-white);
    border: 2px solid var(--color-primary);
    padding: var(--spacing-xs);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    font-size: 14px;
    font-weight: bold;
    order: 1;
    margin-right: var(--spacing-sm);
}

.chart-header .chart-swap-button:hover {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
    transform: rotate(180deg);
}

.chart-header .chart-swap-button:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

/* ===================================
   3. CHART CONTAINER & SVG
   =================================== */
.chart-container {
    width: 100%;
    aspect-ratio: 16/9;
    max-width: 100%;
    position: relative; /* IMPORTANTE: necessário para o tooltip container */
    background: var(--color-white);
    overflow: hidden;
    cursor: crosshair;
    transition: opacity var(--transition-base);
    padding: 0;
    margin: 0;
}

.currency-chart {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    shape-rendering: geometricPrecision;
}

.chart-container.loading {
    opacity: 0.6;
}

.chart-container.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 1;
}

/* SVG Chart */
.currency-chart text {
    -webkit-user-select: none;
    user-select: none;
    pointer-events: none;
}

@media (max-width: 600px) {
    .currency-chart text {
        font-size: 2em;
    }
}

.chart-container, .currency-chart {
    pointer-events: auto;
}

/* ===================================
   4. CHART ELEMENTS
   =================================== */
/* Grid */
.chart-grid line {
    stroke: var(--color-border-light);
    shape-rendering: crispEdges;
}

/* Axes */
.chart-axes text {
    fill: var(--color-text-light);
    font-family: var(--font-system);
}

/* Data Points */
.cp {
    cursor: pointer;
    transition: all var(--transition-fast);
    animation: chartPointFadeIn 0.3s ease-out both;
    animation-delay: calc(0.02s * var(--point-index, 1));
}

.cp:hover,
.cp:focus,
.cp.active {
    opacity: 1 !important;
    r: 0.6% !important;
    filter: drop-shadow(0 0 3px rgba(79, 141, 249, 0.6));
}

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

/* Reference Line */
.reference-line {
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

/* ===================================
   5. TOOLTIP SYSTEM (NEW FLOATING STYLE)
   =================================== */

/* Container do tooltip - overlay transparente sobre o gráfico */
.chart-tooltip-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 100;
    overflow: hidden;
    background: transparent; /* Container totalmente transparente */
}

/* Tooltip flutuante que desliza horizontalmente */
.chart-floating-tooltip {
    position: absolute;
    background: rgba(43, 43, 43, 0.9);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    pointer-events: none;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 150ms ease, transform 150ms ease, left 200ms ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(6px);
    font-family: 'Monaco', 'Menlo', 'Consolas', 'Courier New', monospace;
    white-space: nowrap;
    z-index: 1001;
    min-width: auto;
    width: auto;
    visibility: hidden;
}

.chart-floating-tooltip.show {
    opacity: 1;
    transform: scale(1);
    visibility: visible;
}

/* Positioning using CSS custom properties to avoid CSP issues */
.chart-floating-tooltip.positioned {
    left: var(--tooltip-x, 0px);
    top: var(--tooltip-y, 8px);
}

/* Conteúdo do tooltip - data e valor na mesma linha */
.chart-floating-tooltip .tooltip-content {
    padding: 6px 10px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    line-height: 1.2;
}

.chart-floating-tooltip .tooltip-price {
    font-weight: 700;
    font-size: 0.75rem;
    color: #ffffff;
    letter-spacing: 0.3px;
}

.chart-floating-tooltip .tooltip-date {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 400;
    letter-spacing: 0.2px;
}

/* ===================================
   6. STATISTICS & DATA DISPLAY
   =================================== */
.chart-statistics {
    padding: var(--chart-padding);
    background: var(--color-table-even);
    border-top: 1px solid var(--color-border-light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.stat-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.stat-change {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-change.positive {
    color: var(--color-accent);

}

.stat-change.negative {
    color: var(--color-error);

}

/* ===================================
   7. STATES (Loading, Error, Empty)
   =================================== */
/* Loading State */
.chart-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.95);
    z-index: 10;
}

.spinner {
    --spinner-size: 40px;
    --spinner-border: 4px;

    width: var(--spinner-size);
    height: var(--spinner-size);
    border: var(--spinner-border) solid var(--color-border-light);
    border-top: var(--spinner-border) solid var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

/* Error State */
.chart-error {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    padding: var(--spacing-2xl);
}

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

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.8;
}

.chart-error h3 {
    color: var(--color-error);
    margin: 0 0 var(--spacing-md);
}

.chart-error p {
    color: var(--color-text-light);
    margin: 0 0 var(--spacing-lg);
}

.chart-error button {
    background: var(--color-secondary);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--chart-transition);
}

.chart-error button:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   8. CHART VARIATIONS
   =================================== */
/* Mini Chart Widget */
.chart-widget {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    transition: var(--chart-transition);
    animation: slideIn 0.4s ease-out;
    box-shadow: var(--shadow-md);
}

.chart-widget:hover {
    transform: translateY(-2px);
}

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

.rate-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.rate-change {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.rate-change.positive {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.rate-change.negative {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}
    .full-chart-icon {
    display: inline-block;
    vertical-align: -2px;
    margin-right: 5px;
    }
.full-chart-link {
    font-size: 0.75rem;
    color: var(--color-secondary);
    text-decoration: none;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background: rgba(79, 141, 249, 0.1);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.full-chart-link:hover,
.full-chart-link:focus {
    background: var(--color-secondary);
    color: var(--color-white);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.widget-chart {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.mini-chart {
    width: 100%;
    height: 100%;
    display: block;
}

/* Embedded Chart */
.embedded-chart {
    margin: var(--spacing-lg) 0;
}

.main-page-chart {
    margin: var(--spacing-lg) 0;
}

/* ===================================
   9. PAGE LAYOUTS
   =================================== */
/* Chart Section */
.chart-section {
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

/* Rate Summary */
.rate-summary {
    padding: var(--chart-padding);
    background: var(--color-table-even);
    border-bottom: 1px solid var(--color-border-light);
}

.current-rate {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-md);
}

.current-rate .chart-swap-button {
    margin: 0 0 0 var(--spacing-sm);
    background: var(--color-primary);
    color: var(--color-white);
    border: 2px solid var(--color-primary);
    padding: var(--spacing-xs);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 12px;
    font-weight: bold;
}

.current-rate .chart-swap-button:hover {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
    transform: rotate(180deg);
}

.current-rate .chart-swap-button:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
    opacity: 1;
}


.rate-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* Charts Grid - Mobile First Responsive Design */
.charts-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);

    /* Mobile first: single column */
    grid-template-columns: 1fr;
}

/* Small tablets and larger phones (≥480px) */
@media (min-width: 480px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }
}

/* Tablets (≥640px) */
@media (min-width: 640px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

/* Large tablets and small laptops (≥768px) */
@media (min-width: 768px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--spacing-xl);
    }
}

/* Desktop (≥1024px) */
@media (min-width: 1024px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

/* Large desktop (≥1200px) */
@media (min-width: 1200px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
        max-width: 1400px; /* Prevent excessive stretching */
        margin-left: auto;
        margin-right: auto;
    }
}

/* Ultra-wide screens (≥1600px) */
@media (min-width: 1600px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
        max-width: 1600px;
    }
}

/* Very small screens (≤360px) */
@media (max-width: 360px) {
    .charts-grid {
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-xl);
    }

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

    .chart-card h3 {
        font-size: 0.9rem;
    }
}

.chart-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md); /* Mobile first: smaller padding */
    transition: var(--chart-transition);
    width: 100%;
    display: flex;
    flex-direction: column;
}

/* Responsive chart card padding */
@media (min-width: 480px) {
    .chart-card {
        padding: var(--spacing-lg);
    }
}

@media (min-width: 768px) {
    .chart-card {
        padding: var(--chart-padding);
    }
}

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

.chart-card h3 {
    margin: 0 0 var(--spacing-md);
    font-size: 1rem; /* Mobile first: smaller font */
    line-height: 1.3;
}

/* Responsive chart card typography */
@media (min-width: 480px) {
    .chart-card h3 {
        font-size: 1.0625rem;
    }
}

@media (min-width: 768px) {
    .chart-card h3 {
        font-size: 1.125rem;
    }
}

.chart-card h3 a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-base);
}

.chart-card h3 a:hover {
    color: var(--color-secondary);
}

/* Chart Actions */
.chart-actions {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.view-chart-btn,
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: var(--chart-transition);
}

.view-chart-btn,
.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-white);
}

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

.view-chart-btn:hover,
.btn-secondary:hover,
.btn-primary:hover {
    transform: translateY(-1px);
    text-decoration: none;
}

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

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

/* Sidebar Widgets */
.sidebar-widget {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.sidebar-widget h3 {
    margin: 0 0 var(--spacing-md);
    font-size: 1.125rem;
    color: var(--color-text);
}

.sidebar-widget ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-widget li {
    margin-bottom: var(--spacing-sm);
}

.sidebar-widget a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-base);
    display: block;
    padding: var(--spacing-xs) 0;
}

.sidebar-widget a:hover,
.sidebar-widget a:focus {
    color: var(--color-secondary);
    text-decoration: none;
}

.sidebar-widget a.active {
    color: var(--color-secondary);
    font-weight: 600;
    position: relative;
    padding-left: var(--spacing-sm);
}

.sidebar-widget a.active::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-size: 0.8em;
}

/* ===================================
   10. ANIMATIONS
   =================================== */
@keyframes chartFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes chartPointFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 0;
        transform: scale(1);
    }
}

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

/* Animation Classes */
.chart-animate-in .currency-chart-widget {
    animation: chartFadeIn 0.6s ease-out;
}

.chart-container.animate-in {
    animation: fadeIn 0.4s ease-out;
}

/* ===================================
   11. THEME SUPPORT
   =================================== */

/* Dark theme */
[data-theme="dark"] .chart-floating-tooltip {
    background: rgba(30, 30, 30, 0.9);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* Light theme */
[data-theme="light"] .chart-floating-tooltip {
    background: rgba(255, 255, 255, 0.9);
    color: #1e293b;
    border-color: rgba(0, 0, 0, 0.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .chart-floating-tooltip .tooltip-price {
    color: #1e293b;
}

[data-theme="light"] .chart-floating-tooltip .tooltip-date {
    color: rgba(30, 41, 59, 0.8);
}

/* Auto dark mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .chart-floating-tooltip {
        background: rgba(30, 30, 30, 0.9);
        border-color: rgba(255, 255, 255, 0.2);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    }
}

/* Auto light mode */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .chart-floating-tooltip {
        background: rgba(255, 255, 255, 0.9);
        color: #1e293b;
        border-color: rgba(0, 0, 0, 0.2);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }

    :root:not([data-theme="dark"]) .chart-floating-tooltip .tooltip-price {
        color: #1e293b;
    }

    :root:not([data-theme="dark"]) .chart-floating-tooltip .tooltip-date {
        color: rgba(30, 41, 59, 0.8);
    }
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --tooltip-bg: rgba(43, 61, 82, 0.7);
    --tooltip-border: var(--color-border);
    --tooltip-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

/* Dark Mode Specific Styles */
[data-theme="dark"] .chart-loading {
    background: rgba(30, 30, 30, 0.95);
}

[data-theme="dark"] .chart-container.loading::after {
    background: rgba(30, 30, 30, 0.8);
}

[data-theme="dark"] .range-btn {
    background: var(--color-card-bg);
    border-color: var(--color-border);
}

/* Dark mode support for swap button in header */
[data-theme="dark"] .chart-header .chart-swap-button {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

[data-theme="dark"] .chart-header .chart-swap-button:hover {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* Automatic Dark Mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --tooltip-bg: rgba(43, 61, 82, 0.7);
        --tooltip-border: var(--color-border);
        --tooltip-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    }

    :root:not([data-theme="light"]) .chart-loading {
        background: rgba(30, 30, 30, 0.95);
    }

    :root:not([data-theme="light"]) .chart-container.loading::after {
        background: rgba(30, 30, 30, 0.8);
    }

    :root:not([data-theme="light"]) .range-btn {
        background: var(--color-card-bg);
        border-color: var(--color-border);
    }

    :root:not([data-theme="light"]) .chart-header .chart-swap-button {
        background: var(--color-primary);
        border-color: var(--color-primary);
    }

    :root:not([data-theme="light"]) .chart-header .chart-swap-button:hover {
        background: var(--color-secondary);
        border-color: var(--color-secondary);
    }
}

/* ===================================
   12. RESPONSIVE DESIGN
   =================================== */

/* Mobile */
@media (max-width: 768px) {
    .chart-floating-tooltip {
        font-size: 0.7rem;
    }

    .chart-floating-tooltip .tooltip-content {
        padding: 5px 8px;
        gap: 6px;
    }

    .chart-floating-tooltip .tooltip-price {
        font-size: 0.7rem;
    }

    .chart-floating-tooltip .tooltip-date {
        font-size: 0.65rem;
    }
}

/* Touch devices */
@media (hover: none) and (pointer: coarse) {
    .chart-floating-tooltip {
        font-size: 0.75rem;
        backdrop-filter: blur(4px);
    }

    .chart-floating-tooltip .tooltip-content {
        padding: 8px 10px;
        gap: 8px;
    }
}

/* Tablets */
@media (max-width: 768px) {
    .chart-container {
        min-height: 400px;
    }

    .chart-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: var(--spacing-sm);
    }

    .chart-header h3 {
        order: 2;
        margin-bottom: var(--spacing-sm);
    }

    .chart-header .chart-swap-button {
        order: 1;
        align-self: center;
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }

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

    .current-rate {
        font-size: 1.5rem;
        flex-direction: row;
        gap: var(--spacing-sm);
    }

    .current-rate .chart-swap-button {
        margin-left: var(--spacing-sm);
    }

    .widget-rate {
        flex-direction: column;
        align-items: flex-start;
    }

    .full-chart-link {
        align-self: flex-end;
        margin-top: var(--spacing-xs);
    }

}

/* Mobile Phones */
@media (max-width: 480px) {
    .chart-container {
        min-height: 300px;
    }

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

    .current-rate {
        font-size: 1.25rem;
        flex-direction: row;
        gap: var(--spacing-xs);
    }

    .current-rate .chart-swap-button {
        margin-left: var(--spacing-xs);
    }

    .chart-card-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .view-chart-btn {
        width: 100%;
        min-width: auto;
    }
}

/* Touch Devices */
@media (hover: none) and (pointer: coarse) {
    .enhanced-chart-tooltip {
        font-size: 0.875rem;
        max-width: 180px;
    }

    .tooltip-content {
        padding: 6px 10px;
    }

    .cp {
        /* Larger touch targets */
        stroke-width: 20;
        stroke: transparent;
    }
}

/* ===================================
   13. ACCESSIBILITY
   =================================== */

/* High contrast */
@media (prefers-contrast: high) {
    .chart-floating-tooltip {
        border-width: 2px;
        backdrop-filter: none;
    }

    [data-theme="light"] .chart-floating-tooltip,
    :root:not([data-theme="dark"]) .chart-floating-tooltip {
        background: rgba(255, 255, 255, 1);
        border-color: #000000;
    }

    [data-theme="dark"] .chart-floating-tooltip,
    :root:not([data-theme="light"]) .chart-floating-tooltip {
        background: rgba(0, 0, 0, 1);
        border-color: #ffffff;
    }
}

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

    .chart-floating-tooltip {
        transition: opacity 50ms ease;
        transform: scale(1);
    }

    .chart-floating-tooltip.show {
        transform: scale(1);
    }

    .spinner {
        animation: none;
        border-top-color: transparent;
    }
}

/* High Contrast */
@media (prefers-contrast: high) {
    .range-btn,
    .enhanced-chart-tooltip {
        border: 2px solid var(--color-white);
    }

    .reference-line {
        stroke: var(--color-text);
        stroke-width: 1;
    }
}

/* Print Styles */
@media print {
    .range-buttons,
    .chart-actions,
    .spinner,
    .chart-tooltip-container,
    .chart-floating-tooltip {
        display: none !important;
    }

    .chart-container {
        padding-bottom: 0;
        height: 400px;
    }
}

/* Chart Preview Links */
.chart-links {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.chart-links .view-chart-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    background: var(--color-secondary);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition-base);
}

.chart-links .view-chart-btn:hover {
    background: var(--color-primary);
    transform: translateY(-1px);
    text-decoration: none;
}

/* Chart Info Section */
.chart-info {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.chart-info h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.chart-info h3 {
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--color-text);
}

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

.chart-info li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
}

.chart-info li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

.chart-info code {
    background: var(--color-bg-body);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--color-secondary);
}

/* Popular Charts Widget */
.popular-charts-widget {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-sm);
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.popular-charts-widget h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-size: 1.5rem;
    text-align: center;
}

.chart-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs); /* Mobile first: smaller gap */
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Responsive chart card header */
@media (min-width: 480px) {
    .chart-card-header {
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
        flex-wrap: nowrap;
    }
}

.chart-card-header img {
    border-radius: var(--radius-sm);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.chart-card-header h3 {
    margin: 0;
    font-size: 1.1rem;
    flex: 1;
}

.chart-card-header h3 a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-base);
}

.chart-card-header h3 a:hover {
    color: var(--color-secondary);
}

.chart-card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xs); /* Mobile first: smaller gap */
    margin-top: auto; /* Push to bottom with flexbox */
    flex-wrap: wrap;
}

/* Responsive chart card actions */
@media (min-width: 480px) {
    .chart-card-actions {
        gap: var(--spacing-sm);
        flex-wrap: nowrap;
    }
}

.view-chart-btn {
    background: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm); /* Mobile first: smaller padding */
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.85rem; /* Mobile first: smaller font */
    font-weight: 500;
    transition: var(--transition-base);
    flex: 1;
    text-align: center;
    min-width: 80px;
}

/* Responsive view chart button */
@media (min-width: 480px) {
    .view-chart-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.9rem;
        min-width: 100px;
    }
}

.view-chart-btn:hover {
    background: var(--color-primary);
    transform: translateY(-1px);
    text-decoration: none;
}

.chart-range-badge {
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.widget-rate-row {
    display: flex;
    align-items: center;
    width: 100%;
    justify-content: space-between;
    gap: 8px;
}

.widget-rate-row .full-chart-link {
    margin-left: auto;
}