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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

header h1 {
    font-size: 1.5rem;
    color: #4a90e2;
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #4a90e2;
}

#user-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#logout-btn {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

#logout-btn:hover {
    background-color: #c0392b;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #4a90e2;
}

/* Quick Links */
.quick-links {
    margin-bottom: 3rem;
}

.quick-links h2 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.link-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    text-decoration: none;
    color: #333;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s;
    font-weight: 500;
}

.link-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    color: #4a90e2;
}

/* Auth Container */
.auth-container {
    max-width: 400px;
    margin: 3rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.auth-container h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    color: #4a90e2;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4a90e2;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-primary {
    background-color: #4a90e2;
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background-color: #357abd;
}

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.auth-link {
    text-align: center;
    margin-top: 1rem;
}

.auth-link a {
    color: #4a90e2;
    text-decoration: none;
}

.error-message {
    background-color: #fee;
    color: #c33;
    padding: 1rem;
    border-radius: 4px;
    margin-top: 1rem;
}

.success-message {
    background-color: #efe;
    color: #3c3;
    padding: 1rem;
    border-radius: 4px;
    margin-top: 1rem;
}

/* Posts */
.posts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.post-form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.post-form h3 {
    margin-bottom: 1.5rem;
    color: #4a90e2;
}

.post-form .btn {
    width: auto;
    margin-right: 1rem;
}

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

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
}

.post-author {
    color: #666;
    font-size: 0.9rem;
}

.post-content {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.post-footer {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
}

.like-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: #666;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.like-btn:hover {
    color: #e74c3c;
}

.like-btn.liked {
    color: #e74c3c;
}

.comments-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
}

.comment-form {
    margin-top: 1rem;
}

.comment-form textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.comment {
    background: #f9f9f9;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.comment-author {
    font-weight: 600;
    font-size: 0.9rem;
    color: #4a90e2;
    margin-bottom: 0.25rem;
}

.comment-content {
    color: #666;
}

/* Footer */
footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .posts-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}