/* ============================================
   LABRECON - BlueFrog Analytics
   ============================================
   Light Brutalist Design System
   NASA 1970s technical documentation aesthetic
   ============================================ */

/* === Font Import === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Roboto+Mono:wght@400;500;600;700&display=swap');

/* === CSS Variables - Light Mode (Default) === */
:root {
    /* Signal Colors (NASA Palette - WCAG AA Compliant) */
    --signal-red: #c41e1e;
    --signal-red-light: #fde8e8;
    --signal-orange: #a85400;
    --signal-orange-light: #fff5e6;
    --signal-blue: #1F75FE;
    --signal-blue-hover: #1a63d4;
    --signal-blue-light: #e6f0ff;
    --signal-green: #00694a;
    --signal-green-light: #e6f4ea;
    --signal-amber: #856d00;
    --signal-amber-light: #fef9e6;

    /* Grade System */
    --grade-a: var(--signal-green);
    --grade-a-bg: var(--signal-green-light);
    --grade-b: #4d6617;
    --grade-b-bg: #f0f5e6;
    --grade-c: #8a6500;
    --grade-c-bg: #fffce6;
    --grade-d: var(--signal-orange);
    --grade-d-bg: var(--signal-orange-light);
    --grade-f: var(--signal-red);
    --grade-f-bg: var(--signal-red-light);

    /* Surface System */
    --surface-0: #ffffff;
    --surface-1: #f7f7f7;
    --surface-2: #eeeeee;
    --surface-3: #e0e0e0;

    /* Ink System (Text - WCAG AAA) */
    --ink-100: #000000;
    --ink-90: #111111;
    --ink-70: #333333;
    --ink-50: #555555;
    --ink-30: #888888;

    /* Line System (Borders) */
    --line-fine: #e0e0e0;
    --line-medium: #c0c0c0;
    --line-bold: #000000;

    /* Legacy mapping for compatibility */
    --color-bg: var(--surface-1);
    --color-bg-elevated: var(--surface-0);
    --color-bg-sunken: var(--surface-2);
    --color-border: var(--line-medium);
    --color-border-subtle: var(--line-fine);
    --color-text-primary: var(--ink-100);
    --color-text-secondary: var(--ink-70);
    --color-text-tertiary: var(--ink-50);
    --color-text-muted: var(--ink-30);
    --color-accent: var(--signal-blue);
    --color-accent-hover: var(--signal-blue-hover);
    --color-accent-subtle: var(--signal-blue-light);
    --color-success: var(--signal-green);
    --color-warning: var(--signal-orange);
    --color-danger: var(--signal-red);
    --color-info: var(--signal-blue);

    /* Topo lines */
    --topo-color-1: rgba(31, 117, 254, 0.12);
    --topo-color-2: rgba(31, 117, 254, 0.06);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Roboto Mono', 'SF Mono', 'Consolas', monospace;

    /* Spacing (4px base grid) */
    --grid: 4px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Stroke weights */
    --stroke-hairline: 1px;
    --stroke-fine: 1px;
    --stroke-medium: 2px;
    --stroke-bold: 3px;

    /* Neo-Brutalist: No border radius */
    --radius-sm: 0;
    --radius-md: 0;
    --radius-lg: 0;

    /* Hard offset shadows (no blur) */
    --shadow-brutal: 4px 4px 0 var(--ink-100);
    --shadow-brutal-sm: 2px 2px 0 var(--ink-100);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* === Dark Mode === */
[data-theme="dark"] {
    --surface-0: #0a0a0a;
    --surface-1: #111111;
    --surface-2: #1a1a1a;
    --surface-3: #262626;

    --ink-100: #ffffff;
    --ink-90: #f5f5f5;
    --ink-70: #cccccc;
    --ink-50: #999999;
    --ink-30: #666666;

    --line-fine: #2a2a2a;
    --line-medium: #444444;
    --line-bold: #ffffff;

    --signal-blue-light: #0d2240;
    --signal-green-light: #0d2a1a;
    --signal-red-light: #2a0d0d;
    --signal-orange-light: #2a1a0d;

    --topo-color-1: rgba(31, 117, 254, 0.10);
    --topo-color-2: rgba(31, 117, 254, 0.05);

    --shadow-brutal: 4px 4px 0 var(--ink-100);
    --shadow-brutal-sm: 2px 2px 0 var(--ink-100);
}

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

html {
    font-size: 16px;
    height: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    min-height: 100vh;
    line-height: 1.5;
    position: relative;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* === Animated Topographic Background === */
.topo-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    opacity: 1;
}

.topo-background svg {
    width: 100%;
    height: 100%;
}

.topo-line {
    fill: none;
    stroke: var(--topo-color-1);
    stroke-width: 1;
    animation: topoFloat 25s ease-in-out infinite;
}

.topo-line:nth-child(odd) {
    stroke: var(--topo-color-2);
    animation-duration: 37.5s;
    animation-direction: reverse;
}

@keyframes topoFloat {
    0%, 100% { transform: translateY(0) translateX(0); }
    25% { transform: translateY(-10px) translateX(5px); }
    50% { transform: translateY(-5px) translateX(-5px); }
    75% { transform: translateY(-15px) translateX(3px); }
}

/* === Container === */
.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    position: relative;
    z-index: 1;
}

/* Full width layout for main content */
main.container {
    max-width: none;
    padding: var(--space-xl) var(--space-xl);
}

/* === Header === */
.header {
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(var(--color-bg-elevated), 0.9);
}

[data-theme="dark"] .header {
    background: rgba(20, 20, 20, 0.9);
}

[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.9);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.logo {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.logo-mark {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-nasa-blue);
    text-transform: uppercase;
}

.logo-mark a {
    color: inherit;
    text-decoration: none;
}

.logo-mark a:hover {
    text-decoration: underline;
}

.logo-name {
    font-family: var(--font-sans);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

.logo-version {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
    margin-left: var(--space-xs);
}

.tagline {
    font-size: 12px;
    color: var(--color-text-tertiary);
    padding-left: var(--space-lg);
    border-left: 1px solid var(--color-border);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.status-group {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-secondary);
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--signal-green);
    position: relative;
}

/* Pulsing animation for online status */
.status-item.online .status-dot {
    background: var(--signal-green);
    animation: pulse-status 2s ease-in-out infinite;
}

.status-item.online .status-dot::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--signal-green);
    opacity: 0;
    animation: pulse-ring 2s ease-in-out infinite;
}

@keyframes pulse-status {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(0.95); }
}

@keyframes pulse-ring {
    0% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 0; transform: scale(1.8); }
    100% { opacity: 0; transform: scale(1); }
}

.status-dot.warning {
    background: var(--signal-orange);
    animation: none;
}

.status-dot.warning::after {
    display: none;
}

.mode-badge {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}

.mode-badge.mock {
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.mode-badge.live {
    border-color: var(--color-success);
    color: var(--color-success);
}

/* Theme Toggle */
.theme-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* === Main Content === */
main.container {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-2xl);
}

/* === Main Layout - Filters + Results Side by Side === */
.main-layout {
    display: grid;
    grid-template-columns: minmax(280px, 320px) 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.filters-panel {
    position: sticky;
    top: calc(60px + var(--space-lg));
    max-height: calc(100vh - 80px);
    overflow-y: auto;
}

.results-panel {
    min-width: 0; /* Prevent grid blowout */
}

/* === Search Section === */
.search-section {
    margin-bottom: var(--space-lg);
}

.search-box {
    display: flex;
    gap: var(--space-sm);
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    font-family: var(--font-sans);
    font-size: 14px;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    outline: none;
    transition: all var(--transition-fast);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

/* === Buttons (Neo-Brutalist) === */
.btn {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--ink-100);
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--signal-blue-light);
}

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

.btn-primary:hover {
    background: var(--signal-blue-hover);
    border-color: var(--signal-blue-hover);
}

.btn-secondary {
    background: var(--surface-0);
    color: var(--ink-100);
    border-color: var(--ink-100);
}

.btn-secondary:hover {
    background: var(--ink-100);
    color: var(--surface-0);
}

.btn-ghost {
    background: transparent;
    color: var(--ink-70);
    border-color: var(--line-medium);
}

.btn-ghost:hover {
    background: var(--surface-2);
    border-color: var(--ink-100);
    color: var(--ink-100);
}

.btn-signal {
    background: var(--ink-100);
    color: var(--surface-0);
    border-color: var(--ink-100);
}

.btn-signal:hover {
    background: var(--signal-blue);
    border-color: var(--signal-blue);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* === Filters Section === */
.filters-section {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.filters-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border-subtle);
}

.filters-title {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-md);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.filter-group label {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.filter-select,
.filter-input {
    font-family: var(--font-sans);
    font-size: 13px;
    padding: var(--space-sm) var(--space-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    outline: none;
    transition: all var(--transition-fast);
}

.filter-select:focus,
.filter-input:focus {
    border-color: var(--color-accent);
}

.filter-select option {
    background: var(--color-bg-elevated);
}

.range-inputs {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.range-inputs .filter-input {
    width: 80px;
}

.range-separator {
    color: var(--color-text-muted);
    font-size: 12px;
}

.filter-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-subtle);
}

/* === Stats Bar === */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--color-border);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-lg);
}

.stat {
    background: var(--color-bg-elevated);
    padding: var(--space-md) var(--space-lg);
    text-align: center;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-top: var(--space-xs);
}

/* === Results Section === */
.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.results-count {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-tertiary);
}

/* === Listings Grid === */
.listings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

/* === Listing Card === */
.listing-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.listing-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .listing-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.listing-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-sunken);
    border-bottom: 1px solid var(--color-border-subtle);
}

.listing-compare-checkbox {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
    cursor: pointer;
}

.listing-grade {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    border: 1px solid currentColor;
}

.listing-grade.grade-a {
    color: var(--color-success);
}

.listing-grade.grade-b {
    color: var(--color-info);
}

.listing-grade.grade-c {
    color: var(--color-warning);
}

.listing-grade.grade-d {
    color: var(--color-danger);
}

.listing-image {
    width: 100%;
    height: 160px;
    object-fit: contain;
    background: var(--color-bg-sunken);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border-subtle);
}

.listing-content {
    padding: var(--space-md);
}

.listing-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.listing-id {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
}

.listing-type {
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid;
}

.listing-type.auction {
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.listing-type.buy_it_now {
    border-color: var(--color-success);
    color: var(--color-success);
}

.listing-type.best_offer {
    border-color: var(--color-info);
    color: var(--color-info);
}

.listing-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.listing-price {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.listing-price .shipping {
    font-size: 11px;
    font-weight: 400;
    color: var(--color-text-muted);
}

.listing-specs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.spec-badge {
    font-family: var(--font-mono);
    font-size: 10px;
    padding: 2px 6px;
    background: var(--color-bg-sunken);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}

.spec-badge.highlight {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

.listing-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border-subtle);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
}

.end-time {
    color: var(--color-warning);
}

/* === No Results === */
.no-results {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-tertiary);
}

.no-results p {
    margin-bottom: var(--space-sm);
}

/* === Loading === */
.loading {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-tertiary);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    margin: 0 auto var(--space-md);
    animation: spin 0.8s linear infinite;
}

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

/* === Pagination === */
.pagination-section {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

#page-info {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-secondary);
}

/* === Modal === */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    max-width: 720px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

#modal-body {
    padding: var(--space-lg);
}

.modal-image {
    width: 100%;
    max-height: 240px;
    object-fit: contain;
    background: var(--color-bg-sunken);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.modal-header {
    margin-bottom: var(--space-lg);
}

.modal-id {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.4;
    margin-bottom: var(--space-sm);
}

.modal-price {
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-sunken);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.modal-spec {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.modal-spec-label {
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.modal-spec-value {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-text-primary);
}

.modal-actions {
    display: flex;
    gap: var(--space-sm);
}

.modal-actions .btn {
    flex: 1;
}

/* === Footer === */
.footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-md) 0;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-tertiary);
}

.footer-brand {
    text-decoration: none;
}

.footer-brand:hover {
    text-decoration: underline;
}

.footer-brand-blue {
    color: var(--color-nasa-blue);
    font-weight: 600;
}

.footer-brand-black {
    color: var(--color-text-primary);
}

.footer-classification {
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.footer-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
}

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

/* === Utility === */
.hidden {
    display: none !important;
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* === Selection === */
::selection {
    background: var(--color-accent);
    color: white;
}

/* === Responsive === */
@media (max-width: 1400px) {
    .main-layout {
        grid-template-columns: minmax(280px, 340px) 1fr;
    }
}

@media (max-width: 1200px) {
    main.container {
        padding: var(--space-lg) var(--space-lg);
    }

    .main-layout {
        grid-template-columns: minmax(260px, 320px) 1fr;
    }

    .listings-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
}

@media (max-width: 1024px) {
    .header-content {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .tagline {
        display: none;
    }

    .stats-bar {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Stack layout on tablet */
    .main-layout {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .filters-panel {
        position: static;
        max-height: none;
        overflow-y: visible;
    }

    .listings-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }

    .header-left {
        width: 100%;
        justify-content: space-between;
    }

    .header-right {
        width: 100%;
        justify-content: flex-end;
    }

    .status-group {
        display: none;
    }

    .search-box {
        flex-direction: column;
    }

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

    .stats-bar {
        grid-template-columns: 1fr;
    }

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

    .modal-specs {
        grid-template-columns: 1fr;
    }

    .footer .container {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* === Column Toggle Dropdown === */
.column-toggle-dropdown {
    position: relative;
    display: inline-flex;
}

.column-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.column-toggle-btn:hover {
    background: var(--color-bg-sunken);
    border-color: var(--color-border);
    color: var(--color-text-primary);
}

.column-toggle-btn svg {
    flex-shrink: 0;
}

.column-toggle-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-xs);
    min-width: 180px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 100;
}

.column-toggle-menu.hidden {
    display: none;
}

.column-toggle-header {
    padding: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
    border-bottom: 1px solid var(--color-border-subtle);
    background: var(--color-bg-sunken);
}

.column-toggle-options {
    padding: var(--space-sm);
    max-height: 280px;
    overflow-y: auto;
}

.column-toggle-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    font-family: var(--font-sans);
    font-size: 12px;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.column-toggle-option:hover {
    color: var(--color-text-primary);
}

.column-toggle-option input[type="checkbox"] {
    width: 14px;
    height: 14px;
    margin: 0;
    accent-color: var(--color-accent);
    cursor: pointer;
}

.column-toggle-actions {
    padding: var(--space-sm);
    border-top: 1px solid var(--color-border-subtle);
    background: var(--color-bg-sunken);
}

.column-toggle-reset {
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    color: var(--color-text-tertiary);
    background: transparent;
    border: 1px solid var(--color-border-subtle);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.column-toggle-reset:hover {
    color: var(--color-text-primary);
    border-color: var(--color-border);
    background: var(--color-bg-elevated);
}

/* === Print === */
@media print {
    .topo-background,
    .theme-toggle,
    .column-toggle-dropdown {
        display: none;
    }
}