:root {
    color-scheme: dark;
    --bg: radial-gradient(circle at top, #1e1b4b, #020617 60%);
    --card-bg: rgba(15, 23, 42, 0.85);
    --border: rgba(148, 163, 184, 0.2);
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent-strong: #0ea5e9;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
    box-sizing: border-box;
}

body.login-shell {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--text);
    padding: 2rem;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.login-card {
    width: min(420px, 100%);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(2, 6, 23, 0.55);
    backdrop-filter: blur(18px);
}

.login-header {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 2rem;
}

.login-header img {
    border-radius: 50%;
    border: 1px solid rgba(56, 189, 248, 0.4);
    padding: 0.4rem;
    background: rgba(15, 23, 42, 0.6);
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.75rem;
    color: var(--muted);
    margin: 0 0 0.3rem;
}

h1 {
    margin: 0;
    font-size: 2rem;
}

.alert {
    padding: 0.85rem 1rem;
    border: 1px solid rgba(239, 68, 68, 0.4);
    background: rgba(239, 68, 68, 0.12);
    color: #fecaca;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.95rem;
    color: var(--muted);
}

input {
    font: inherit;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.8);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25);
}

.btn.primary {
    margin-top: 0.8rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: #0f172a;
    font-weight: 600;
    border: none;
    border-radius: 16px;
    padding: 0.95rem 1.25rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(14, 165, 233, 0.35);
}

.login-footer {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
}

@media (max-width: 520px) {
    body.login-shell {
        padding: 1.5rem;
    }

    .login-card {
        padding: 2rem 1.5rem;
    }
}