body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0f0f0f;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: #e5e5e5;
}

/* center container */
.lock-container {
    background: #1b1b1b;
    padding: 32px 40px;
    border-radius: 12px;
    width: 320px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    text-align: center;
    border: 1px solid #2a2a2a;
}

/* title */
.lock-container h2 {
    margin: 0 0 20px;
    font-size: 22px;
    font-weight: 600;
    color: #f5f5f5;
}

/* input */
.lock-container input[type="password"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 18px;
    border-radius: 8px;
    border: 1px solid #333;
    background: #121212;
    color: #e5e5e5;
    font-size: 16px;
    outline: none;
    transition: all 0.2s ease;
}

.lock-container input[type="password"]:focus {
    border-color: #5d5dff;
    box-shadow: 0 0 0 2px rgba(93, 93, 255, 0.3);
}

/* button */
.lock-container button {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    background: #5d5dff;
    border: none;
    font-size: 16px;
    color: white;
    cursor: pointer;
    transition: 0.2s ease;
}

.lock-container button:hover {
    background: #7474ff;
}

/* error message */
.error {
    margin-bottom: 14px;
    padding: 10px;
    border-radius: 6px;
    background: #ff2e2e22;
    color: #ff6b6b;
    font-size: 14px;
    border: 1px solid #ff3434;
}