body {
    font-family: "Segoe UI", Roboto, system-ui, sans-serif;
    background: #f0f2f5;
    margin: 0;
    padding: 0;
    color: #1c1e21;
}
header {
    background: #1877f2;
    color: white;
    padding: 1rem;
    text-align: center;
}
header h1 {
    font-size: 1.8rem;
    margin: 0;
}
nav {
    margin-top: 0.5rem;
}
nav a {
    color: white;
    margin: 0 1rem;
    text-decoration: none;
    font-weight: 500;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 2rem;
}
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.auth-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.auth-card {
    background: white;
    border-radius: 10px;
    padding: 2rem 3rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}
.auth-card h1 {
    color: #1877f2;
    margin-bottom: 0.5rem;
}
.auth-card p {
    margin-bottom: 1.5rem;
    color: #606770;
}
.input-group {
    margin-bottom: 1rem;
}
input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccd0d5;
    border-radius: 6px;
    font-size: 1rem;
}
input:focus {
    outline: none;
    border-color: #1877f2;
    box-shadow: 0 0 3px rgba(24, 119, 242, 0.4);
}
.btn-primary {
    width: 100%;
    background: #1877f2;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.75rem;
    font-size: 1.1rem;
    cursor: pointer;
    font-weight: bold;
}
.btn-primary:hover {
    background: #166fe5;
}
.auth-footer {
    margin-top: 1.5rem;
    color: #606770;
    font-size: 0.95rem;
}
.auth-footer a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 500;
}
.auth-footer a:hover {
    text-decoration: underline;
}
.dashboard, .home {
    max-width: 800px;
    margin: 2rem auto;
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.dashboard h2, .home h2 {
    color: #1877f2;
}