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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Navigation */
.navbar {
    background-color: #4b84c6;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-menu a {
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover, .nav-menu a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background-color: #4b84c6;
    color: white;
}

.btn-primary:hover {
    background-color: #3a6ba8;
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-success {
    background-color: #28a745;
    color: white;
}

.btn-success:hover {
    background-color: #218838;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 3rem 0;
    background-color: white;
}

.hero-content {
    flex: 1;
    padding-right: 2rem;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #4b84c6;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #6c757d;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: #f8f9fa;
    text-align: center;
}

.features h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #4b84c6;
}

.feature-cards {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.feature-card {
    flex: 1;
    min-width: 250px;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #4b84c6;
}

/* Stats Section */
.stats {
    padding: 4rem 0;
    background-color: white;
    text-align: center;
}

.stats h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #4b84c6;
}

.stat-cards {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 2rem;
}

.stat-card {
    flex: 1;
    min-width: 200px;
    padding: 2rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-card h3 {
    font-size: 2.5rem;
    color: #4b84c6;
    margin-bottom: 0.5rem;
}

/* Forms */
.form-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* Item Grid */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.item-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.item-card:hover {
    transform: translateY(-5px);
}

.item-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.item-details {
    padding: 1.5rem;
}

.item-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #4b84c6;
}

.item-description {
    color: #6c757d;
    margin-bottom: 1rem;
}

.item-meta {
    display: flex;
    justify-content: space-between;
    color: #6c757d;
    font-size: 0.9rem;
}

/* Tabs */
.tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.tab {
    padding: 1rem 1.5rem;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab.active {
    border-bottom-color: #4b84c6;
    color: #4b84c6;
    font-weight: 600;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Messages */
.messages-container {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
}

.conversations-list {
    flex: 1;
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    max-height: 600px;
    overflow-y: auto;
}

.conversation-item {
    padding: 1rem;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: background-color 0.3s;
}

.conversation-item:hover, .conversation-item.active {
    background-color: #f8f9fa;
}

.chat-window {
    flex: 2;
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    max-height: 600px;
}

.chat-header {
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.message {
    margin-bottom: 1rem;
    padding: 0.8rem;
    border-radius: 8px;
    max-width: 80%;
}

.message.sent {
    background-color: #4b84c6;
    color: white;
    margin-left: auto;
}

.message.received {
    background-color: #f1f1f1;
    color: #333;
}

.message-form {
    display: flex;
    gap: 1rem;
}

.message-input {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* Admin Panel */
.admin-panel {
    margin: 2rem 0;
}

.admin-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.admin-stat-card {
    flex: 1;
    min-width: 200px;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
}

.admin-stat-card h3 {
    font-size: 2rem;
    color: #4b84c6;
    margin-bottom: 0.5rem;
}

.pending-items {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background-color: #4b84c6;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .feature-cards, .stat-cards {
        flex-direction: column;
    }
    
    .messages-container {
        flex-direction: column;
    }
    
    .admin-stats {
        flex-direction: column;
    }
}