:root {
    --accent-blue: #3b82f6;
    --text-main: #f1f5f9;
    --text-muted: #a8b8d0;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(160deg, #070b14 0%, #0f172a 35%, #0c1222 70%, #060a12 100%);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.auth-card {
    width: 100%;
    max-width: 440px;
    background: rgba(15, 23, 42, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 32px 28px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(16px);
}
.auth-card h1 {
    margin: 0 0 8px;
    font-size: 1.5rem;
    color: #fff;
}
.auth-card p.sub {
    margin: 0 0 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #cbd5e1;
}
.form-group input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-main);
    font-size: 1rem;
}
.form-group input:focus {
    outline: none;
    border-color: rgba(59, 130, 246, 0.5);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
.btn-primary {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
}
.btn-primary:hover { filter: brightness(1.08); }
.alert {
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 0.9rem;
}
.alert-error { background: rgba(239, 68, 68, 0.15); color: #fecaca; border: 1px solid rgba(239, 68, 68, 0.35); }
.alert-success { background: rgba(16, 185, 129, 0.15); color: #a7f3d0; border: 1px solid rgba(16, 185, 129, 0.35); }
.auth-links {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
}
.auth-links a { color: #93c5fd; text-decoration: none; }
.auth-links a:hover { text-decoration: underline; }
.brand-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}
.brand-row img { height: 48px; width: auto; }
.brand-row span { font-size: 0.85rem; color: var(--text-muted); display: block; }