/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Colors - WCAG 2.1 AA Compliant */
    --color-primary: #0056b3;
    --color-primary-hover: #004494;
    --color-text: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-bg: #ffffff;
    --color-border: #d1d1d1;
    --color-border-light: #e5e5e5;

    /* Status Colors - Enhanced for better contrast */
    --color-status-success: #0a7d1f;
    --color-status-warning: #8a5a00;
    --color-status-error: #c91d1d;
    --color-status-info: #004085;

    /* Interactive States */
    --color-focus: #0056b3;
    --color-link: #0056b3;
    --color-link-hover: #003d82;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --line-height-base: 1.5;

    /* Borders & Radius */
    --border-radius: 0.375rem;
    --border-width: 1px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-focus: 0 0 0 3px rgba(0, 86, 179, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    font-weight: 400;
    background-color: var(--color-bg);
    margin: 0 !important;
    height: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Accessibility Utilities
   ============================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Skip to content link for keyboard users */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Focus visible for keyboard navigation - WCAG 2.4.7 */
*:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* Remove outline for mouse users */
*:focus:not(:focus-visible) {
    outline: none;
}

/* ============================================
   Header & Navigation
   ============================================ */
.iframe-section__header {
    border-bottom: var(--border-width) solid var(--color-border);
    background-color: var(--color-bg);
}

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

.iframe-section__header_content,
.sort-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Control Buttons */
.iframe-control-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-link);
    background: transparent;
    border: var(--border-width) solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    line-height: 1.2;
}

.iframe-control-btn:hover {
    color: var(--color-link-hover);
    background-color: rgba(0, 86, 179, 0.05);
    text-decoration: none;
}

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

.iframe-control-btn:active {
    transform: translateY(1px);
}

.iframe-control-btn[aria-pressed="true"] {
    background-color: rgba(0, 86, 179, 0.1);
    color: var(--color-primary);
}

/* Search Section */
.iframe-header-search {
    position: relative;
    width: 100%;
    padding: var(--spacing-md);
    margin: 0;
}

.iframe-extension-search {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.iframe-extension-search:focus {
    border-color: var(--color-focus);
    box-shadow: var(--shadow-focus);
    outline: none;
}

.iframe-extension-search::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.7;
}

.iframe-close-search {
    position: absolute;
    top: 50%;
    right: calc(var(--spacing-md) + 8px);
    transform: translateY(-50%);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: var(--font-size-lg);
    font-weight: 600;
    transition: background-color var(--transition-fast);
}

.iframe-close-search:hover {
    background-color: var(--color-primary-hover);
}

.iframe-close-search:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* ============================================
   Extension List
   ============================================ */
.iframe-extension-list {
    padding: 0;
}

.list-unstyled {
    padding-left: 0;
    list-style: none;
    margin: 0;
}

.iframe-extension-item {
    border-bottom: var(--border-width) solid var(--color-border-light);
    transition: background-color var(--transition-fast);
}

.iframe-extension-item:last-child {
    border-bottom: none;
}

.iframe-extension-item:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.iframe-extensions__list {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--spacing-sm);
    gap: var(--spacing-md);
}

.iframe-extensions__inner {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    flex: 1;
    min-width: 0; /* Allow text truncation */
}

/* ============================================
   Status Icons
   ============================================ */
.iframe-extensions__status {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
}

.status-cell {
    width: 30px;
    height: 30px;
    display: inline-block;
    background-size: 145px 40px;
    background-repeat: no-repeat;
}

/* Status Icon Sprites */
.status-cell_1_1 {
    background-image: url("/assets/images/status_icons/status_icon_1_30px.png");
    background-position: -5px -5px;
}

.status-cell_1_2 {
    background-image: url("/assets/images/status_icons/status_icon_1_30px.png");
    background-position: -40px -5px;
}

.status-cell_1_3 {
    background-image: url("/assets/images/status_icons/status_icon_1_30px.png");
    background-position: -75px -5px;
}

.status-cell_1_4 {
    background-image: url("/assets/images/status_icons/status_icon_1_30px.png");
    background-position: -110px -5px;
}

.status-cell_2_1 {
    background-image: url("/assets/images/status_icons/status_icon_2_30px.png");
    background-position: -5px -5px;
}

.status-cell_2_2 {
    background-image: url("/assets/images/status_icons/status_icon_2_30px.png");
    background-position: -40px -5px;
}

.status-cell_2_3 {
    background-image: url("/assets/images/status_icons/status_icon_2_30px.png");
    background-position: -75px -5px;
}

.status-cell_2_4 {
    background-image: url("/assets/images/status_icons/status_icon_2_30px.png");
    background-position: -110px -5px;
}

.status-cell_3_1 {
    background-image: url("/assets/images/status_icons/status_icon_3_30px.png");
    background-position: -5px -5px;
}

.status-cell_3_2 {
    background-image: url("/assets/images/status_icons/status_icon_3_30px.png");
    background-position: -40px -5px;
}

.status-cell_3_3 {
    background-image: url("/assets/images/status_icons/status_icon_3_30px.png");
    background-position: -75px -5px;
}

.status-cell_3_4 {
    background-image: url("/assets/images/status_icons/status_icon_3_30px.png");
    background-position: -110px -5px;
}

.status-cell_4_1 {
    background-image: url("/assets/images/status_icons/status_icon_4_30px.png");
    background-position: -5px -5px;
}

.status-cell_4_2 {
    background-image: url("/assets/images/status_icons/status_icon_4_30px.png");
    background-position: -40px -5px;
}

.status-cell_4_3 {
    background-image: url("/assets/images/status_icons/status_icon_4_30px.png");
    background-position: -75px -5px;
}

.status-cell_4_4 {
    background-image: url("/assets/images/status_icons/status_icon_4_30px.png");
    background-position: -110px -5px;
}

.status-cell_5_1 {
    background-image: url("/assets/images/status_icons/status_icon_5_30px.png");
    background-position: -5px -5px;
}

.status-cell_5_2 {
    background-image: url("/assets/images/status_icons/status_icon_5_30px.png");
    background-position: -40px -5px;
}

.status-cell_5_3 {
    background-image: url("/assets/images/status_icons/status_icon_5_30px.png");
    background-position: -75px -5px;
}

.status-cell_5_4 {
    background-image: url("/assets/images/status_icons/status_icon_5_30px.png");
    background-position: -110px -5px;
}

/* Opacity levels for status indicators */
.opacity-1 {
    opacity: 1 !important;
}

.opacity-2 {
    opacity: 0.8 !important;
}

.opacity-3 {
    opacity: 0.6 !important;
}

.opacity-4 {
    opacity: 0.4 !important;
}

.opacity-5 {
    opacity: 0.2 !important;
}

/* ============================================
   Extension Content
   ============================================ */
.iframe-extensions__content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.iframe-extensions__content_inner {
    display: flex;
    align-items: center;
    min-width: 0;
}

.extension-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-fast);
    word-break: break-word;
    line-height: 1.3;
}

.extension-name:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

.extension-name:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
    border-radius: 2px;
}

.address {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.address strong {
    font-weight: 700;
}

/* Status Color Classes - WCAG AA Compliant */
.status-1 {
    color: var(--color-status-success) !important;
}

.status-2 {
    color: var(--color-status-warning) !important;
}

.status-3 {
    color: var(--color-status-error) !important;
}

.status-4 {
    color: var(--color-status-info) !important;
}

.update-time {
    color: var(--color-text-secondary);
}

.extension-detail {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.02);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--color-text);
}

/* Status-based background colors for extension details */
.extension-detail-status-1 {
    background-color: rgba(10, 125, 31, 0.08); /* Light green for success */
    border: 1px solid rgba(10, 125, 31, 0.2);
}

.extension-detail-status-2 {
    background-color: rgba(138, 90, 0, 0.08); /* Light amber for warning */
    border: 1px solid rgba(138, 90, 0, 0.2);
}

.extension-detail-status-3 {
    background-color: rgba(201, 29, 29, 0.08); /* Light red for error */
    border: 1px solid rgba(201, 29, 29, 0.2);
}

.extension-detail-status-4 {
    background-color: rgba(0, 64, 133, 0.08); /* Light blue for info */
    border: 1px solid rgba(0, 64, 133, 0.2);
}

.extension-time {
    display: none;
}

/* Tooltip */
.detail-tooltip {
    display: inline-flex;
}

.tooltip-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.tooltip-trigger:hover {
    background-color: rgba(0, 86, 179, 0.1);
}

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

/* ============================================
   Extension Actions
   ============================================ */
.iframe-extensions__action {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.extension-number {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.favorite-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    text-decoration: none;
}

.favorite-link:hover {
    background-color: rgba(0, 0, 0, 0.05);
    transform: scale(1.05);
}

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

.favorite-link:active {
    transform: scale(0.95);
}

.favorite-link img {
    width: 24px;
    height: 24px;
    display: block;
}

/* ============================================
   Refresh Controls
   ============================================ */
.iframe-refresh-btn {
    /* Inherits from .iframe-control-btn */
}

.iframe-last-updated {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
}

.iframe-last-updated time {
    font-weight: 600;
    color: var(--color-text);
}

/* ============================================
   Utility Classes
   ============================================ */
.d-none {
    display: none !important;
}

.no-found {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .iframe-header-info {
        gap: var(--spacing-sm);
    }

    .iframe-control-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

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

@media (max-width: 576px) {
    .hidden-mobile {
        display: none;
    }

    .iframe-header-info {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .iframe-extensions__list {
        gap: var(--spacing-sm);
    }

    .extension-name {
        font-size: var(--font-size-base);
    }

    .address {
        font-size: 0.8125rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .iframe-section__header {
        display: none;
    }

    .iframe-extensions__action {
        display: none;
    }

    .iframe-extension-item {
        break-inside: avoid;
    }
}

/* ============================================
   Reduced Motion Support - WCAG 2.3.3
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   High Contrast Mode Support
   ============================================ */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-border-light: #000000;
    }

    .iframe-extension-item {
        border-bottom-width: 2px;
    }

    *:focus-visible {
        outline-width: 3px;
    }
}