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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-card: #1a1a1a;
    --bg-card-hover: #222;
    --accent: #09b1ba;
    --accent-hover: #07959d;
    --buy-btn: #00a650;
    --buy-btn-hover: #008c44;
    --text-primary: #f0f0f0;
    --text-secondary: #999;
    --text-muted: #666;
    --border: #2a2a2a;
    --error: #e74c3c;
    --radius: 10px;
    --radius-sm: 6px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

.hidden { display: none !important; }

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

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

.btn-primary {
    background: var(--accent);
    color: #fff;
}

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

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

.btn-small {
    padding: 6px 14px;
    font-size: 13px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.btn-small:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

/* Top Bar */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-icon {
    width: 26px;
    height: 26px;
    border-radius: 6px;
}

.top-bar-left h1 {
    font-size: 18px;
    font-weight: 700;
}

.filter-badge {
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.refresh-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.refresh-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--buy-btn);
    animation: pulse 1s ease-in-out infinite;
}

.refresh-dot.paused {
    background: var(--text-muted);
    animation: none;
}

.refresh-dot.stale {
    background: #f9a825;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* Settings panel */
.settings-panel {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(120px, 1fr));
    gap: 14px;
    max-width: 900px;
}

.settings-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.settings-field-wide {
    grid-column: span 2;
}

.settings-field input,
.settings-field select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    outline: none;
}

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

.settings-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    align-self: end;
}

.settings-toggle input {
    accent-color: var(--accent);
}

.settings-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.settings-hint {
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
}

.settings-hint:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .settings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .settings-field-wide {
        grid-column: span 2;
    }
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
}

.items-count {
    font-size: 14px;
    color: var(--text-secondary);
}

.pause-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.pause-toggle input {
    accent-color: var(--accent);
}

/* Catalog Grid */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    padding: 16px 20px;
}

.item-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.2s, transform 0.15s;
    display: flex;
    flex-direction: column;
}

.item-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.item-card a {
    text-decoration: none;
    color: inherit;
}

.item-image-wrap {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--bg-secondary);
}

.item-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.item-card:hover .item-image-wrap img {
    transform: scale(1.05);
}

.item-price-tag {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.item-info {
    padding: 10px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.item-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-brand {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-meta {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    gap: 8px;
    margin-top: 2px;
}

.item-condition {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    display: inline-block;
}

.cond-nuevo-con-etiqueta { background: #00796b; color: #fff; }
.cond-nuevo-sin-etiqueta { background: #00897b; color: #fff; }
.cond-muy-bueno { background: #2e7d32; color: #fff; }
.cond-bueno { background: #558b2f; color: #fff; }
.cond-satisfactorio { background: #f9a825; color: #222; }
.cond-default { background: var(--border); color: var(--text-secondary); }

.item-stats {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    gap: 10px;
    margin-top: 2px;
}

.seller-business {
    background: var(--border);
    color: var(--text-secondary);
    padding: 1px 6px;
    border-radius: 8px;
    font-weight: 600;
}

.promoted-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.75);
    color: var(--text-secondary);
    font-size: 10px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-offer {
    display: block;
    width: 100%;
    padding: 8px;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    margin-top: 6px;
    text-decoration: none;
    transition: background 0.2s;
}

.btn-offer:hover {
    background: rgba(9, 177, 186, 0.1);
}

.item-actions {
    padding: 0 12px 12px;
}

.btn-buy {
    display: block;
    width: 100%;
    padding: 10px;
    background: var(--buy-btn);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background 0.2s, transform 0.1s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-buy:hover {
    background: var(--buy-btn-hover);
}

.btn-buy:active {
    transform: scale(0.97);
}

/* Loading */
.loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 12px;
}

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

/* Error Banner */
.error-banner {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--error);
    z-index: 200;
    max-width: 90%;
}

/* New item highlight */
.new-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    z-index: 2;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.item-card.new-item {
    animation: highlightNew 2s ease-out;
}

/* Sold items */
.sold-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--error);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    z-index: 2;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.item-card.sold-item {
    opacity: 0.55;
}

.item-card.sold-item .item-image-wrap img {
    filter: grayscale(1);
}

@keyframes highlightNew {
    0% {
        box-shadow: 0 0 0 2px var(--accent);
        border-color: var(--accent);
    }
    100% {
        box-shadow: none;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .top-bar {
        flex-direction: column;
        gap: 8px;
        padding: 10px 14px;
    }

    .top-bar-right {
        width: 100%;
        justify-content: space-between;
    }

    .user-email {
        display: none;
    }

    .catalog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        padding: 10px;
    }

    .item-price-tag {
        font-size: 14px;
    }

    .item-info {
        padding: 8px 10px;
    }

    .item-actions {
        padding: 0 10px 10px;
    }
}

@media (max-width: 400px) {
    .catalog-grid {
        grid-template-columns: 1fr;
    }
}

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

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

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

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