* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, #1877F2 0%, #0e5ebf 100%);
    min-height: 100vh;
    padding: 20px;
}
.container {
    max-width: 400px;
    margin: 60px auto;
}
.card {
    background: white;
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}
.logo {
    text-align: center;
    margin-bottom: 24px;
}
.logo svg {
    width: 60px;
    height: 60px;
}
h1 {
    font-size: 24px;
    color: #1877F2;
    text-align: center;
    margin-bottom: 8px;
}
.subtitle {
    text-align: center;
    color: #666;
    font-size: 14px;
    margin-bottom: 28px;
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
}
input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #ddd;
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
}
input:focus {
    outline: none;
    border-color: #1877F2;
    box-shadow: 0 0 0 3px rgba(24,119,242,0.1);
}
.btn-submit {
    width: 100%;
    background: #1877F2;
    color: white;
    border: none;
    padding: 14px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 40px;
    cursor: pointer;
    transition: 0.3s;
}
.btn-submit:hover {
    background: #1464c9;
    transform: translateY(-2px);
}
.btn-back {
    display: block;
    text-align: center;
    margin-top: 15px;
    color: #666;
    text-decoration: none;
    font-size: 14px;
}
.btn-back:hover {
    color: #1877F2;
}
.error-message {
    background: #fee2e2;
    border: 1px solid #ef4444;
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 20px;
    color: #dc2626;
    font-size: 14px;
}
.success-message {
    background: #dcfce7;
    border: 1px solid #22c55e;
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 20px;
    color: #16a34a;
    font-size: 14px;
}
.footer {
    text-align: center;
    margin-top: 20px;
    font-size: 11px;
    color: rgba(255,255,255,0.7);
}