:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --error: #ef4444;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0, transparent 50%), 
        radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.1) 0, transparent 50%);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    color: var(--text-main);
}

.login-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    width: 100%;
    max-width: 360px;
    transition: transform 0.3s ease;
}

.brand-logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -1px;
    margin-bottom: 8px;
    color: var(--primary);
}

.brand-logo span {
    color: var(--text-main);
}

h3 {
    margin: 0 0 24px 0;
    font-weight: 400;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 6px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="password"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

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

button:active {
    transform: scale(0.98);
}

.erro {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    padding: 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 20px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.footer-note {
    margin-top: 24px;
    font-size: 0.75rem;
    color: var(--text-muted);
}