/* ========== Global Styles ========== */
body {
    background: #0a0a0a;
    color: #eee;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}

/* Header */
header {
    background: #111;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #333;
    flex-wrap: wrap;
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.logo img {
    height: 90px;
    vertical-align: middle;
}
.tagline {
    font-size: 1.0rem;
    color: #aaa;
}
nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}
nav a {
    text-decoration: none;
    color: #fff;
    font-size: 0.9rem;
}
.btn-login, .btn-register, .btn-chat, .btn-logout {
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    transition: background 0.2s;
}
.btn-login { background: #28a745; }
.btn-register { background: #007bff; }
.btn-chat { background: #17a2b8; }
.btn-logout { background: #dc3545; }

/* Footer */
footer {
    background: #111;
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid #333;
    font-size: 0.8rem;
}
.footer-links a {
    color: #ccc;
    margin: 0 10px;
    text-decoration: none;
}
.copyright {
    margin-top: 0.8rem;
    color: #666;
}

/* Auth Forms */
.auth-container {
    max-width: 400px;
    margin: 2rem auto;
    background: #1e1e1e;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.auth-container h2 {
    margin-top: 0;
    text-align: center;
}
.auth-container input,
.auth-container select {
    width: 100%;
    padding: 0.6rem;
    margin: 0.5rem 0;
    background: #2c2c2c;
    border: 1px solid #444;
    color: #fff;
    border-radius: 4px;
    box-sizing: border-box;
}
.auth-container button {
    width: 100%;
    padding: 0.6rem;
    background: #007bff;
    border: none;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}
.auth-container button:hover {
    background: #0056b3;
}
.auth-container p {
    text-align: center;
    margin-top: 1rem;
}
.error {
    background: #ff4444;
    color: white;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    text-align: center;
}
.success {
    background: #28a745;
    color: white;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    text-align: center;
}

/* Landing Page */
main {
    min-height: calc(100vh - 120px);
}
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
}
.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.hero p {
    font-size: 1.2rem;
    color: #ccc;
}
.cta-buttons {
    margin-top: 2rem;
}
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.8rem 2rem;
    margin: 0 0.5rem;
    border-radius: 5px;
    text-decoration: none;
}
.btn-primary {
    background: #007bff;
    color: white;
}
.btn-secondary {
    background: #6c757d;
    color: white;
}
.features {
    padding: 4rem 2rem;
    text-align: center;
}
.features h2 {
    margin-bottom: 2rem;
}
.feature-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}
.feature {
    background: #111;
    padding: 1.5rem;
    border-radius: 8px;
    width: 250px;
}
.feature h3 {
    margin-top: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    .cta-buttons { flex-direction: column; gap: 1rem; }
    .btn-primary, .btn-secondary { width: 80%; text-align: center; }
    .feature { width: 100%; max-width: 300px; margin: 0 auto; }
}