:root {
    --primary-color: #1877f2;
    --secondary-color: #42b72a;
    --background-color: #f0f2f5;
    --card-color: #ffffff;
    --text-primary: #1c1e21;
    --text-secondary: #65676b;
    --border-color: #dddfe2;
    --error-color: #ff4444;
    --success-color: #00C851;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header Styles */
header {
    background-color: var(--card-color);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
    margin-left: 10px;
}

.logo-icon {
    font-size: 28px;
    color: var(--primary-color);
}

.search-bar {
    flex: 1;
    max-width: 680px;
    margin: 0 20px;
}

.search-bar input {
    width: 100%;
    padding: 10px 15px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    font-size: 15px;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    margin-left: 10px;
}

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

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

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

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    display: flex;
    margin-top: 20px;
    gap: 20px;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    height: fit-content;
}

.sidebar-section {
    margin-bottom: 20px;
}

.sidebar-section h3 {
    font-size: 17px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.sidebar-list {
    list-style: none;
}

.sidebar-list li {
    padding: 8px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
}

.sidebar-list li:hover {
    background-color: var(--background-color);
    border-radius: 8px;
    padding-left: 8px;
}

.sidebar-list a {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    width: 100%;
}

.sidebar-icon {
    margin-right: 10px;
    color: var(--text-secondary);
}

/* Ads Grid */
.ads-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.ad-card {
    background-color: var(--card-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.ad-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.ad-image {
    width: 100%;
    height: 160px;
    background-color: #e9ebee;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    overflow: hidden;
}

.ad-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ad-details {
    padding: 12px;
}

.ad-price {
    font-weight: bold;
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.ad-title {
    font-size: 15px;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.ad-location {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Form Styles */
.form-container {
    max-width: 500px;
    margin: 40px auto;
    background-color: var(--card-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 15px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px 20px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #166fe5;
}

.form-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
}

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

.form-footer a:hover {
    text-decoration: underline;
}

/* Alert Messages */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background-color: #ffebee;
    color: var(--error-color);
    border: 1px solid #ffcdd2;
}

.alert-success {
    background-color: #e8f5e8;
    color: var(--success-color);
    border: 1px solid #c8e6c9;
}

/* Dashboard Styles */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

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

/* AdSense Container */
.adsense-container {
    margin: 20px 0;
    background-color: var(--card-color);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.adsense-placeholder {
    background-color: #e9ebee;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: 4px;
}

/* Ad Details Page */
.ad-details-container {
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.ad-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
}

.main-image {
    grid-column: 1 / -1;
    height: 400px;
    background-color: #e9ebee;
    border-radius: 8px;
    overflow: hidden;
}

.main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thumbnail {
    height: 100px;
    background-color: #e9ebee;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ad-info {
    margin-top: 30px;
}

.ad-meta {
    display: flex;
    gap: 20px;
    margin: 15px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.seller-info {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

/* Responsive */
@media (max-width: 900px) {
    .main-content {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
    }
    .ads-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

@media (max-width: 600px) {
    .header-content {
        flex-wrap: wrap;
    }
    .search-bar {
        order: 3;
        margin: 10px 0 0;
        max-width: 100%;
    }
    .ads-grid {
        grid-template-columns: 1fr 1fr;
    }
    .ad-images {
        grid-template-columns: 1fr;
    }
}