/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

body {
    background: #f5f7fa;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: white;
    max-width: 400px;
    width: 100%;
    padding: 30px 25px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

h1, h2 {
    margin-bottom: 20px;
    color: #1a202c;
    font-weight: 600;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    padding: 12px 14px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    width: 100%;
    transition: border 0.2s;
}

input:focus {
    outline: none;
    border-color: #3182ce;
    box-shadow: 0 0 0 3px rgba(49,130,206,0.2);
}

.btn {
    background: #3182ce;
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: #2b6cb0;
}

.error {
    background: #fed7d7;
    color: #9b2c2c;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    text-align: center;
}

.success {
    background: #c6f6d5;
    color: #276749;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    text-align: center;
}

p {
    margin-top: 15px;
    text-align: center;
    font-size: 14px;
}

a {
    color: #3182ce;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Mobile optimizations */
@media (max-width: 480px) {
    .container {
        padding: 20px 15px;
    }
    input, .btn {
        font-size: 15px;
        padding: 11px 12px;
    }
}