:root {
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-primary: #1f4fd8;
    --color-primary-dark: #173ca5;
    --color-text: #172033;
    --color-muted: #687385;
    --color-border: #e1e6ef;
    --color-danger: #b42318;
    --color-danger-bg: #fee4e2;
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(31, 79, 216, 0.18), transparent 32rem),
        linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
    color: var(--color-text);
}

.auth-page {
    min-height: 100vh;
    padding: 24px;
    display: grid;
    place-items: center;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: 0 24px 80px rgba(17, 24, 39, 0.12);
}

.auth-card__brand {
    width: 54px;
    height: 54px;
    border-radius: 14px;
    background: var(--color-primary);
    color: #ffffff;
    display: grid;
    place-items: center;
    font-weight: 800;
    margin-bottom: 24px;
}

.auth-card h1 {
    margin: 0;
    font-size: 28px;
}

.auth-card__subtitle {
    margin: 10px 0 28px;
    color: var(--color-muted);
    line-height: 1.5;
}

.auth-form {
    display: grid;
    gap: 18px;
}

.form-group {
    display: grid;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 12px 14px;
    font: inherit;
    outline: none;
}

.form-group input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(31, 79, 216, 0.12);
}

.button {
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.button--primary {
    background: var(--color-primary);
    color: #ffffff;
}

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

.alert {
    margin-bottom: 20px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--color-danger-bg);
    color: var(--color-danger);
    font-weight: 600;
}

@media (max-width: 480px) {
    .auth-page {
        padding: 16px;
    }

    .auth-card {
        padding: 24px;
    }
}