:root {
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --border-color: #e5e7eb;
    --error: #ef4444;
    --success: #10b981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.register-container {
    width: 100%;
    max-width: 450px;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    padding: 40px 30px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--ui-text);
    margin-bottom: 8px;
}

.header p {
    color: var(--ui-muted);
    font-size: 14px;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.5;
}

.alert-error {
    background-color: var(--ui-error-bg);
    color: var(--ui-error-text);
    border: 1px solid var(--ui-error-border);
}

.alert-success {
    background-color: var(--ui-success-bg);
    color: var(--ui-success-text);
    border: 1px solid var(--ui-success-border);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--ui-text);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background-color: var(--ui-input-bg);
    color: var(--ui-input-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    background-color: var(--ui-surface);
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    background-color: var(--primary);
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: var(--primary-hover);
}

.footer-text {
    text-align: center;
    margin-top: 25px;
    font-size: 14px;
    color: var(--ui-muted);
}

.footer-text a {
    color: var(--ui-primary);
    text-decoration: none;
    font-weight: 500;
}

.footer-text a:hover {
    text-decoration: underline;
}