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

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

.navbar {
    background: #fff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: #007bff;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #007bff;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #333;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #666;
}

.actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    display: inline-block;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
}

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

.btn-secondary:hover {
    background: #545b62;
}

.form-container {
    max-width: 400px;
    margin: 0 auto;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.form-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
}

.form-group {
    margin-bottom: 1rem;
}

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

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid #f5c6cb;
}

.profile-container {
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.user-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 4px;
    margin-bottom: 2rem;
}

.user-info h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

.realtime-container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.chat-container {
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow: hidden;
}

.messages {
    height: 300px;
    overflow-y: auto;
    padding: 1rem;
    background: #f8f9fa;
}

.input-container {
    display: flex;
    padding: 1rem;
    gap: 1rem;
    background: #fff;
}

.input-container input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* Utility Classes */
.bg-gray-800 { background-color: #1f2937; }
.text-white { color: #ffffff; }
.text-gray-300 { color: #d1d5db; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-blue-500 { color: #3b82f6; }
.font-bold { font-weight: 700; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-4xl { font-size: 2.25rem; }
.max-w-4xl { max-width: 56rem; }
.max-w-7xl { max-width: 80rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.p-8 { padding: 2rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mr-6 { margin-right: 1.5rem; }
.ml-2 { margin-left: 0.5rem; }
.mt-auto { margin-top: auto; }
.h-16 { height: 4rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-shrink-0 { flex-shrink: 0; }
.text-center { text-align: center; }
.bg-white { background-color: #ffffff; }
.rounded-lg { border-radius: 0.5rem; }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }

@media (min-width: 640px) {
    .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 1024px) {
    .lg\:px-8 { padding-left: 2rem; padding-right: 2rem; }
}

@media (min-width: 768px) {
    .md\:text-xl { font-size: 1.25rem; }
}

.text-md { font-size: 1rem; }

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}