:root {
    --bg: #111827;
    --panel: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text: #172033;
    --muted: #6b7280;
    --border: #d9e1ef;
    --error-bg: #fee2e2;
    --error-text: #991b1b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #111827 0%, #1f2937 45%, #0f766e 100%);
    color: var(--text);
}

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

.login-panel {
    width: min(100%, 420px);
    background: var(--panel);
    border-radius: 8px;
    padding: 32px;
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 26px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 24px;
    font-weight: 700;
}

.brand h1 {
    margin: 0;
    font-size: 24px;
}

.brand p {
    margin: 4px 0 0;
    color: var(--muted);
}

.alert {
    padding: 12px 14px;
    margin-bottom: 18px;
    border-radius: 8px;
    background: var(--error-bg);
    color: var(--error-text);
    font-weight: 600;
}

.login-form {
    display: grid;
    gap: 10px;
}

.login-form label {
    font-size: 14px;
    font-weight: 700;
    color: #374151;
}

.login-form input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 16px;
    outline: none;
}

.login-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.login-form button {
    margin-top: 12px;
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    padding: 13px 16px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
}

.login-form button:hover {
    background: var(--primary-hover);
}