:root {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --color-blue: #38bdf8;
    --bg-input: rgba(15, 23, 42, 0.6);
}

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

.login-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 360px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

h2 {
    margin-top: 0;
    text-align: center;
    color: var(--color-blue);
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

input {
    width: 100%;
    padding: 10px;
    background: var(--bg-input);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    color: #fff;
    box-sizing: border-box;
}

input:focus {
    outline: 1px solid var(--color-blue);
}

button {
    width: 100%;
    padding: 10px;
    background: var(--color-blue);
    border: none;
    border-radius: 6px;
    color: #0f172a;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    opacity: 0.9;
}

.error-msg {
    color: #f87171;
    font-size: 0.85rem;
    text-align: center;
    margin-top: 10px;
    display: none;
}