/* --- Variables --- */
:root {
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --accent: #3b82f6;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --danger: #ef4444;
}

body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    width: 90%;
    max-width: 400px;
}

.login-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    text-align: center;
}

h2 { margin-bottom: 2rem; font-weight: 600; }
h2 span { color: var(--accent); }

.input-group {
    text-align: left;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

input {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #334155;
    background: #0f172a;
    color: white;
    font-size: 1rem;
    outline: none;
}

input:focus { border-color: var(--accent); }

button {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: none;
    background: var(--accent);
    color: white;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.2s;
}

button:hover { background: #2563eb; }

.error-hidden { display: none; }
.error-show {
    display: block;
    color: var(--danger);
    font-size: 0.9rem;
    margin-top: 1rem;
}